This change adds support to bridge_softmix to allow the addition and removal of additional video source streams. When such a change occurs each participant is renegotiated as needed to reflect the update. If another video source is added then each participant gets another source. If a video source is removed then it is removed from each participant. This functionality allows you to have both your webcam and screenshare providing video if you desire, or even more streams. Mapping has been changed to use the topology index on the source channel as a unique identifier for outgoing participant streams, this will never change and provides an easy way to establish the mapping. The bridge_simple and bridge_native_rtp modules have also been updated to renegotiate when the stream topology of a party changes allowing the same behavior to occur as added to bridge_softmix. If a screen share is added then the opposite party is renegotiated. If that screen share is removed then the opposite party is renegotiated again. Some additional fixes are also included in here. Stream state is now conveyed in SDP so sendonly/recvonly/inactive streams can be requested. Removed streams now also remove previous state from themselves so consumers don't get confused. ASTERISK-28733 Change-Id: I93f41fb41b85646bef71408111c17ccea30cb0c5
2831 lines
92 KiB
C
2831 lines
92 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2011, Digium, Inc.
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*
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* Joshua Colp <jcolp@digium.com>
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* David Vossel <dvossel@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief Multi-party software based channel mixing
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*
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* \author Joshua Colp <jcolp@digium.com>
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* \author David Vossel <dvossel@digium.com>
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*
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* \ingroup bridges
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*/
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/*** MODULEINFO
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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#include <math.h>
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#include "asterisk/stream.h"
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#include "asterisk/test.h"
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#include "asterisk/vector.h"
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#include "asterisk/message.h"
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#include "bridge_softmix/include/bridge_softmix_internal.h"
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/*! The minimum sample rate of the bridge. */
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#define SOFTMIX_MIN_SAMPLE_RATE 8000 /* 8 kHz sample rate */
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/*! \brief Interval at which mixing will take place. Valid options are 10, 20, and 40. */
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#define DEFAULT_SOFTMIX_INTERVAL 20
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/*! \brief Size of the buffer used for sample manipulation */
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#define SOFTMIX_DATALEN(rate, interval) ((rate/50) * (interval / 10))
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/*! \brief Number of samples we are dealing with */
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#define SOFTMIX_SAMPLES(rate, interval) (SOFTMIX_DATALEN(rate, interval) / 2)
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/*! \brief Number of mixing iterations to perform between gathering statistics. */
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#define SOFTMIX_STAT_INTERVAL 100
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/*!
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* \brief Default time in ms of silence necessary to declare talking stopped by the bridge.
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*
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* \details
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* This is the time at which a channel's own audio will stop getting
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* mixed out of its own write audio stream because it is no longer talking.
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*/
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#define DEFAULT_SOFTMIX_SILENCE_THRESHOLD 2500
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/*! Default minimum average magnitude threshold to determine talking by the DSP. */
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#define DEFAULT_SOFTMIX_TALKING_THRESHOLD 160
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#define SOFTBRIDGE_VIDEO_DEST_PREFIX "softbridge_dest"
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#define SOFTBRIDGE_VIDEO_DEST_LEN strlen(SOFTBRIDGE_VIDEO_DEST_PREFIX)
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#define SOFTBRIDGE_VIDEO_DEST_SEPARATOR '_'
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struct softmix_remb_collector {
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/*! The frame which will be given to each source stream */
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struct ast_frame frame;
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/*! The REMB to send to the source which is collecting REMB reports */
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struct ast_rtp_rtcp_feedback feedback;
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/*! The maximum bitrate (A single precision floating point is big enough) */
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float bitrate;
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};
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struct softmix_stats {
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/*! Each index represents a sample rate used above the internal rate. */
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unsigned int sample_rates[16];
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/*! Each index represents the number of channels using the same index in the sample_rates array. */
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unsigned int num_channels[16];
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/*! The number of channels above the internal sample rate */
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unsigned int num_above_internal_rate;
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/*! The number of channels above the maximum sample rate */
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unsigned int num_above_maximum_rate;
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/*! The number of channels at the internal sample rate */
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unsigned int num_at_internal_rate;
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/*! The absolute highest sample rate preferred by any channel in the bridge */
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unsigned int highest_supported_rate;
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/*! Is the sample rate locked by the bridge, if so what is that rate.*/
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unsigned int locked_rate;
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/*! The maximum sample rate the bridge may use */
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unsigned int maximum_rate;
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};
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struct softmix_translate_helper_entry {
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int num_times_requested; /*!< Once this entry is no longer requested, free the trans_pvt
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and re-init if it was usable. */
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struct ast_format *dst_format; /*!< The destination format for this helper */
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struct ast_trans_pvt *trans_pvt; /*!< the translator for this slot. */
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struct ast_frame *out_frame; /*!< The output frame from the last translation */
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AST_LIST_ENTRY(softmix_translate_helper_entry) entry;
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};
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struct softmix_translate_helper {
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struct ast_format *slin_src; /*!< the source format expected for all the translators */
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AST_LIST_HEAD_NOLOCK(, softmix_translate_helper_entry) entries;
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};
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static struct softmix_translate_helper_entry *softmix_translate_helper_entry_alloc(struct ast_format *dst)
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{
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struct softmix_translate_helper_entry *entry;
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if (!(entry = ast_calloc(1, sizeof(*entry)))) {
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return NULL;
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}
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entry->dst_format = ao2_bump(dst);
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/* initialize this to one so that the first time through the cleanup code after
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allocation it won't be removed from the entry list */
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entry->num_times_requested = 1;
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return entry;
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}
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static void *softmix_translate_helper_free_entry(struct softmix_translate_helper_entry *entry)
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{
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ao2_cleanup(entry->dst_format);
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if (entry->trans_pvt) {
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ast_translator_free_path(entry->trans_pvt);
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}
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if (entry->out_frame) {
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ast_frfree(entry->out_frame);
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}
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ast_free(entry);
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return NULL;
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}
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static void softmix_translate_helper_init(struct softmix_translate_helper *trans_helper, unsigned int sample_rate)
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{
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memset(trans_helper, 0, sizeof(*trans_helper));
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trans_helper->slin_src = ast_format_cache_get_slin_by_rate(sample_rate);
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}
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static void softmix_translate_helper_destroy(struct softmix_translate_helper *trans_helper)
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{
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struct softmix_translate_helper_entry *entry;
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while ((entry = AST_LIST_REMOVE_HEAD(&trans_helper->entries, entry))) {
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softmix_translate_helper_free_entry(entry);
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}
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}
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static void softmix_translate_helper_change_rate(struct softmix_translate_helper *trans_helper, unsigned int sample_rate)
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{
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struct softmix_translate_helper_entry *entry;
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trans_helper->slin_src = ast_format_cache_get_slin_by_rate(sample_rate);
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AST_LIST_TRAVERSE_SAFE_BEGIN(&trans_helper->entries, entry, entry) {
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if (entry->trans_pvt) {
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ast_translator_free_path(entry->trans_pvt);
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if (!(entry->trans_pvt = ast_translator_build_path(entry->dst_format, trans_helper->slin_src))) {
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AST_LIST_REMOVE_CURRENT(entry);
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entry = softmix_translate_helper_free_entry(entry);
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}
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}
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}
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AST_LIST_TRAVERSE_SAFE_END;
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}
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/*!
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* \internal
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* \brief Get the next available audio on the softmix channel's read stream
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* and determine if it should be mixed out or not on the write stream.
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*
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* \retval pointer to buffer containing the exact number of samples requested on success.
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* \retval NULL if no samples are present
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*/
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static int16_t *softmix_process_read_audio(struct softmix_channel *sc, unsigned int num_samples)
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{
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if ((ast_slinfactory_available(&sc->factory) >= num_samples) &&
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ast_slinfactory_read(&sc->factory, sc->our_buf, num_samples)) {
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sc->have_audio = 1;
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return sc->our_buf;
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}
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sc->have_audio = 0;
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return NULL;
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}
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/*!
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* \internal
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* \brief Process a softmix channel's write audio
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*
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* \details This function will remove the channel's talking from its own audio if present and
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* possibly even do the channel's write translation for it depending on how many other
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* channels use the same write format.
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*/
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static void softmix_process_write_audio(struct softmix_translate_helper *trans_helper,
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struct ast_format *raw_write_fmt,
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struct softmix_channel *sc, unsigned int default_sample_size)
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{
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struct softmix_translate_helper_entry *entry = NULL;
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int i;
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/* If we provided audio that was not determined to be silence,
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* then take it out while in slinear format. */
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if (sc->have_audio && sc->talking && !sc->binaural) {
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for (i = 0; i < sc->write_frame.samples; i++) {
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ast_slinear_saturated_subtract(&sc->final_buf[i], &sc->our_buf[i]);
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}
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/* check to see if any entries exist for the format. if not we'll want
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to remove it during cleanup */
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AST_LIST_TRAVERSE(&trans_helper->entries, entry, entry) {
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if (ast_format_cmp(entry->dst_format, raw_write_fmt) == AST_FORMAT_CMP_EQUAL) {
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++entry->num_times_requested;
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break;
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}
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}
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/* do not do any special write translate optimization if we had to make
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* a special mix for them to remove their own audio. */
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return;
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} else if (sc->have_audio && sc->talking && sc->binaural > 0) {
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/*
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* Binaural audio requires special saturated substract since we have two
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* audio signals per channel now.
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*/
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softmix_process_write_binaural_audio(sc, default_sample_size);
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return;
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}
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/* Attempt to optimize channels using the same translation path/codec. Build a list of entries
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of translation paths and track the number of references for each type. Each one of the same
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type should be able to use the same out_frame. Since the optimization is only necessary for
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multiple channels (>=2) using the same codec make sure resources are allocated only when
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needed and released when not (see also softmix_translate_helper_cleanup */
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AST_LIST_TRAVERSE(&trans_helper->entries, entry, entry) {
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if (sc->binaural != 0) {
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continue;
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}
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if (ast_format_cmp(entry->dst_format, raw_write_fmt) == AST_FORMAT_CMP_EQUAL) {
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entry->num_times_requested++;
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} else {
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continue;
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}
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if (!entry->trans_pvt && (entry->num_times_requested > 1)) {
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entry->trans_pvt = ast_translator_build_path(entry->dst_format, trans_helper->slin_src);
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}
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if (entry->trans_pvt && !entry->out_frame) {
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entry->out_frame = ast_translate(entry->trans_pvt, &sc->write_frame, 0);
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}
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if (entry->out_frame && entry->out_frame->frametype == AST_FRAME_VOICE
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&& entry->out_frame->datalen < MAX_DATALEN) {
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ao2_replace(sc->write_frame.subclass.format, entry->out_frame->subclass.format);
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memcpy(sc->final_buf, entry->out_frame->data.ptr, entry->out_frame->datalen);
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sc->write_frame.datalen = entry->out_frame->datalen;
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sc->write_frame.samples = entry->out_frame->samples;
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}
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break;
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}
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/* add new entry into list if this format destination was not matched. */
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if (!entry && (entry = softmix_translate_helper_entry_alloc(raw_write_fmt))) {
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AST_LIST_INSERT_HEAD(&trans_helper->entries, entry, entry);
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}
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}
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static void softmix_translate_helper_cleanup(struct softmix_translate_helper *trans_helper)
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{
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struct softmix_translate_helper_entry *entry;
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AST_LIST_TRAVERSE_SAFE_BEGIN(&trans_helper->entries, entry, entry) {
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/* if it hasn't been requested then remove it */
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if (!entry->num_times_requested) {
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AST_LIST_REMOVE_CURRENT(entry);
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softmix_translate_helper_free_entry(entry);
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continue;
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}
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if (entry->out_frame) {
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ast_frfree(entry->out_frame);
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entry->out_frame = NULL;
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}
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/* nothing is optimized for a single path reference, so there is
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no reason to continue to hold onto the codec */
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if (entry->num_times_requested == 1 && entry->trans_pvt) {
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ast_translator_free_path(entry->trans_pvt);
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entry->trans_pvt = NULL;
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}
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/* for each iteration (a mixing run) in the bridge softmix thread the number
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of references to a given entry is recalculated, so reset the number of
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times requested */
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entry->num_times_requested = 0;
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}
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AST_LIST_TRAVERSE_SAFE_END;
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}
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static void set_softmix_bridge_data(int rate, int interval, struct ast_bridge_channel *bridge_channel, int reset, int set_binaural, int binaural_pos_id, int is_announcement)
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{
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struct softmix_channel *sc = bridge_channel->tech_pvt;
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struct ast_format *slin_format;
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int setup_fail;
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#ifdef BINAURAL_RENDERING
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if (interval != BINAURAL_MIXING_INTERVAL) {
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interval = BINAURAL_MIXING_INTERVAL;
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}
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#endif
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/* The callers have already ensured that sc is never NULL. */
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ast_assert(sc != NULL);
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slin_format = ast_format_cache_get_slin_by_rate(rate);
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ast_mutex_lock(&sc->lock);
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if (reset) {
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ast_slinfactory_destroy(&sc->factory);
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ast_dsp_free(sc->dsp);
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}
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/* Setup write frame parameters */
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sc->write_frame.frametype = AST_FRAME_VOICE;
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/*
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* NOTE: The write_frame format holds a reference because translation
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* could be needed and the format changed to the translated format
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* for the channel. The translated format may not be a
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* static cached format.
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*/
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ao2_replace(sc->write_frame.subclass.format, slin_format);
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sc->write_frame.data.ptr = sc->final_buf;
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sc->write_frame.datalen = SOFTMIX_DATALEN(rate, interval);
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sc->write_frame.samples = SOFTMIX_SAMPLES(rate, interval);
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/* We will store the rate here cause we need to set the data again when a channel is unsuspended */
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sc->rate = rate;
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/* If the channel will contain binaural data we will set a identifier in the channel
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* if set_binaural == -1 this is just a sample rate update, will ignore it. */
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if (set_binaural == 1) {
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sc->binaural = 1;
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} else if (set_binaural == 0) {
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sc->binaural = 0;
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}
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/* Setting the binaural position. This doesn't require a change of the overlaying channel infos
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* and doesn't have to be done if we just updating sample rates. */
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if (binaural_pos_id != -1) {
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sc->binaural_pos = binaural_pos_id;
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}
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if (is_announcement != -1) {
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sc->is_announcement = is_announcement;
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}
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/*
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* NOTE: The read_slin_format does not hold a reference because it
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* will always be a signed linear format.
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*/
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sc->read_slin_format = slin_format;
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/* Setup smoother */
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setup_fail = ast_slinfactory_init_with_format(&sc->factory, slin_format);
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/* set new read and write formats on channel. */
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ast_channel_lock(bridge_channel->chan);
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setup_fail |= ast_set_read_format_path(bridge_channel->chan,
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ast_channel_rawreadformat(bridge_channel->chan), slin_format);
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ast_channel_unlock(bridge_channel->chan);
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/* If channel contains binaural data we will set it here for the trans_pvt. */
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if (set_binaural == 1 || (set_binaural == -1 && sc->binaural == 1)) {
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setup_fail |= ast_set_write_format_interleaved_stereo(bridge_channel->chan, slin_format);
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} else if (set_binaural == 0) {
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setup_fail |= ast_set_write_format(bridge_channel->chan, slin_format);
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}
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/* set up new DSP. This is on the read side only right before the read frame enters the smoother. */
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sc->dsp = ast_dsp_new_with_rate(rate);
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if (setup_fail || !sc->dsp) {
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/* Bad news. Could not setup the channel for softmix. */
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ast_mutex_unlock(&sc->lock);
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ast_bridge_channel_leave_bridge(bridge_channel, BRIDGE_CHANNEL_STATE_END, 0);
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return;
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}
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/* we want to aggressively detect silence to avoid feedback */
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if (bridge_channel->tech_args.talking_threshold) {
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ast_dsp_set_threshold(sc->dsp, bridge_channel->tech_args.talking_threshold);
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} else {
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ast_dsp_set_threshold(sc->dsp, DEFAULT_SOFTMIX_TALKING_THRESHOLD);
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}
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ast_mutex_unlock(&sc->lock);
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}
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/*!
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* \internal
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* \brief Poke the mixing thread in case it is waiting for an active channel.
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* \since 12.0.0
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*
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* \param softmix_data Bridge mixing data.
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*
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* \return Nothing
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*/
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static void softmix_poke_thread(struct softmix_bridge_data *softmix_data)
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{
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ast_mutex_lock(&softmix_data->lock);
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ast_cond_signal(&softmix_data->cond);
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ast_mutex_unlock(&softmix_data->lock);
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}
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/*! \brief Function called when a channel is unsuspended from the bridge */
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static void softmix_bridge_unsuspend(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
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{
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#ifdef BINAURAL_RENDERING
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struct softmix_channel *sc = bridge_channel->tech_pvt;
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if (sc->binaural) {
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/* Restore some usefull data if it was a binaural channel */
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struct ast_format *slin_format;
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slin_format = ast_format_cache_get_slin_by_rate(sc->rate);
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ast_set_write_format_interleaved_stereo(bridge_channel->chan, slin_format);
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}
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#endif
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if (bridge->tech_pvt) {
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softmix_poke_thread(bridge->tech_pvt);
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}
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}
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/*!
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* \brief Determine if a stream is a video source stream.
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*
|
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* \param stream The stream to test
|
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* \retval 1 The stream is a video source
|
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* \retval 0 The stream is not a video source
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*/
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static int is_video_source(const struct ast_stream *stream)
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{
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if (ast_stream_get_state(stream) != AST_STREAM_STATE_REMOVED
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&& ast_stream_get_type(stream) == AST_MEDIA_TYPE_VIDEO
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&& strncmp(ast_stream_get_name(stream), SOFTBRIDGE_VIDEO_DEST_PREFIX,
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|
SOFTBRIDGE_VIDEO_DEST_LEN)) {
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*!
|
|
* \brief Determine if a stream is a video destination stream.
|
|
*
|
|
* A source channel name can be provided to narrow this to a destination stream
|
|
* for a particular source channel. Further, a source stream name can be provided
|
|
* to narrow this to a particular source stream's destination. However, empty strings
|
|
* can be provided to match any destination video stream, regardless of source channel
|
|
* or source stream.
|
|
*
|
|
* \param stream The stream to test
|
|
* \param source_channel_name The name of a source video channel to match
|
|
* \param source_channel_stream_position The position of the video on the source channel
|
|
* \retval 1 The stream is a video destination stream
|
|
* \retval 0 The stream is not a video destination stream
|
|
*/
|
|
static int is_video_dest(const struct ast_stream *stream, const char *source_channel_name,
|
|
int source_channel_stream_position)
|
|
{
|
|
char *dest_video_name;
|
|
size_t dest_video_name_len;
|
|
|
|
if (ast_stream_get_state(stream) == AST_STREAM_STATE_REMOVED
|
|
|| ast_stream_get_type(stream) != AST_MEDIA_TYPE_VIDEO) {
|
|
return 0;
|
|
}
|
|
|
|
dest_video_name_len = SOFTBRIDGE_VIDEO_DEST_LEN + 1;
|
|
if (!ast_strlen_zero(source_channel_name)) {
|
|
dest_video_name_len += strlen(source_channel_name) + 1;
|
|
if (source_channel_stream_position != -1) {
|
|
dest_video_name_len += 11;
|
|
}
|
|
|
|
dest_video_name = ast_alloca(dest_video_name_len);
|
|
if (source_channel_stream_position != -1) {
|
|
/* We are looking for an exact stream position */
|
|
snprintf(dest_video_name, dest_video_name_len, "%s%c%s%c%d",
|
|
SOFTBRIDGE_VIDEO_DEST_PREFIX, SOFTBRIDGE_VIDEO_DEST_SEPARATOR,
|
|
source_channel_name, SOFTBRIDGE_VIDEO_DEST_SEPARATOR,
|
|
source_channel_stream_position);
|
|
return !strcmp(ast_stream_get_name(stream), dest_video_name);
|
|
}
|
|
snprintf(dest_video_name, dest_video_name_len, "%s%c%s",
|
|
SOFTBRIDGE_VIDEO_DEST_PREFIX, SOFTBRIDGE_VIDEO_DEST_SEPARATOR,
|
|
source_channel_name);
|
|
} else {
|
|
dest_video_name = SOFTBRIDGE_VIDEO_DEST_PREFIX;
|
|
}
|
|
|
|
return !strncmp(ast_stream_get_name(stream), dest_video_name, dest_video_name_len - 1);
|
|
}
|
|
|
|
static int append_source_stream(struct ast_stream_topology *dest,
|
|
const char *channel_name, const char *sdp_label,
|
|
struct ast_stream *stream, int index)
|
|
{
|
|
char *stream_clone_name = NULL;
|
|
struct ast_stream *stream_clone;
|
|
|
|
/* We use the stream topology index for the stream to uniquely identify and recognize it.
|
|
* This is guaranteed to remain the same across renegotiation of the source channel and
|
|
* ensures that the stream name is unique.
|
|
*/
|
|
if (ast_asprintf(&stream_clone_name, "%s%c%s%c%d", SOFTBRIDGE_VIDEO_DEST_PREFIX,
|
|
SOFTBRIDGE_VIDEO_DEST_SEPARATOR, channel_name, SOFTBRIDGE_VIDEO_DEST_SEPARATOR,
|
|
index) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
stream_clone = ast_stream_clone(stream, stream_clone_name);
|
|
ast_free(stream_clone_name);
|
|
if (!stream_clone) {
|
|
return -1;
|
|
}
|
|
|
|
/* Sends an "a:label" attribute in the SDP for participant event correlation */
|
|
if (!ast_strlen_zero(sdp_label)) {
|
|
ast_stream_set_metadata(stream_clone, "SDP:LABEL", sdp_label);
|
|
}
|
|
|
|
/* We will be sending them a stream and not expecting anything in return */
|
|
ast_stream_set_state(stream_clone, AST_STREAM_STATE_SENDONLY);
|
|
|
|
if (ast_stream_topology_append_stream(dest, stream_clone) < 0) {
|
|
ast_stream_free(stream_clone);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int append_source_streams(struct ast_stream_topology *dest,
|
|
const char *channel_name, const char *sdp_label,
|
|
const struct ast_stream_topology *source)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ast_stream_topology_get_count(source); ++i) {
|
|
struct ast_stream *stream;
|
|
|
|
stream = ast_stream_topology_get_stream(source, i);
|
|
|
|
if (!is_video_source(stream)) {
|
|
continue;
|
|
}
|
|
|
|
if (append_source_stream(dest, channel_name, sdp_label, stream, i)) {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int append_all_streams(struct ast_stream_topology *dest,
|
|
const struct ast_stream_topology *source)
|
|
{
|
|
int i;
|
|
int dest_index = 0;
|
|
|
|
for (i = 0; i < ast_stream_topology_get_count(source); ++i) {
|
|
struct ast_stream *clone;
|
|
int added = 0;
|
|
|
|
clone = ast_stream_clone(ast_stream_topology_get_stream(source, i), NULL);
|
|
if (!clone) {
|
|
return -1;
|
|
}
|
|
|
|
/* If we can reuse an existing removed stream then do so */
|
|
while (dest_index < ast_stream_topology_get_count(dest)) {
|
|
struct ast_stream *stream = ast_stream_topology_get_stream(dest, dest_index);
|
|
|
|
dest_index++;
|
|
|
|
if (ast_stream_get_state(stream) == AST_STREAM_STATE_REMOVED) {
|
|
/* This cannot fail because dest_index - 1 is less than the
|
|
* current count in dest. */
|
|
ast_stream_topology_set_stream(dest, dest_index - 1, clone);
|
|
added = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* If no removed stream exists that we took the place of append the stream */
|
|
if (!added && ast_stream_topology_append_stream(dest, clone) < 0) {
|
|
ast_stream_free(clone);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*!
|
|
* \brief Issue channel stream topology change requests.
|
|
*
|
|
* When in SFU mode, each participant needs to be able to
|
|
* send video directly to other participants in the bridge.
|
|
* This means that all participants need to have their topologies
|
|
* updated. The joiner needs to have destination streams for
|
|
* all current participants, and the current participants need
|
|
* to have destinations streams added for the joiner's sources.
|
|
*
|
|
* \param joiner The channel that is joining the softmix bridge
|
|
* \param participants The current participants in the softmix bridge
|
|
*/
|
|
static void sfu_topologies_on_join(struct ast_bridge *bridge,
|
|
struct ast_bridge_channel *joiner)
|
|
{
|
|
struct ast_stream_topology *joiner_video = NULL;
|
|
struct ast_bridge_channels_list *participants = &bridge->channels;
|
|
struct ast_bridge_channel *participant;
|
|
int res;
|
|
struct softmix_channel *sc;
|
|
|
|
joiner_video = ast_stream_topology_alloc();
|
|
if (!joiner_video) {
|
|
return;
|
|
}
|
|
|
|
sc = joiner->tech_pvt;
|
|
|
|
ast_channel_lock(joiner->chan);
|
|
res = append_source_streams(joiner_video, ast_channel_name(joiner->chan),
|
|
bridge->softmix.send_sdp_label ? ast_channel_uniqueid(joiner->chan) : NULL,
|
|
ast_channel_get_stream_topology(joiner->chan));
|
|
sc->topology = ast_stream_topology_clone(ast_channel_get_stream_topology(joiner->chan));
|
|
ast_channel_unlock(joiner->chan);
|
|
|
|
if (res || !sc->topology) {
|
|
goto cleanup;
|
|
}
|
|
|
|
AST_LIST_TRAVERSE(participants, participant, entry) {
|
|
if (participant == joiner) {
|
|
continue;
|
|
}
|
|
ast_channel_lock(participant->chan);
|
|
res = append_source_streams(sc->topology, ast_channel_name(participant->chan),
|
|
bridge->softmix.send_sdp_label ? ast_channel_uniqueid(participant->chan) : NULL,
|
|
ast_channel_get_stream_topology(participant->chan));
|
|
ast_channel_unlock(participant->chan);
|
|
if (res) {
|
|
goto cleanup;
|
|
}
|
|
}
|
|
|
|
ast_channel_request_stream_topology_change(joiner->chan, sc->topology, NULL);
|
|
|
|
AST_LIST_TRAVERSE(participants, participant, entry) {
|
|
if (participant == joiner) {
|
|
continue;
|
|
}
|
|
|
|
sc = participant->tech_pvt;
|
|
if (append_all_streams(sc->topology, joiner_video)) {
|
|
goto cleanup;
|
|
}
|
|
ast_channel_request_stream_topology_change(participant->chan, sc->topology, NULL);
|
|
}
|
|
|
|
cleanup:
|
|
ast_stream_topology_free(joiner_video);
|
|
}
|
|
|
|
/*! \brief Function called when a channel is joined into the bridge */
|
|
static int softmix_bridge_join(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
|
|
{
|
|
struct softmix_channel *sc;
|
|
struct softmix_bridge_data *softmix_data;
|
|
int set_binaural = 0;
|
|
/*
|
|
* If false, the channel will be convolved, but since it is a non stereo channel, output
|
|
* will be mono.
|
|
*/
|
|
int skip_binaural_output = 1;
|
|
int pos_id;
|
|
int is_announcement = 0;
|
|
int samplerate_change;
|
|
|
|
softmix_data = bridge->tech_pvt;
|
|
if (!softmix_data) {
|
|
return -1;
|
|
}
|
|
|
|
/* Create a new softmix_channel structure and allocate various things on it */
|
|
if (!(sc = ast_calloc(1, sizeof(*sc)))) {
|
|
return -1;
|
|
}
|
|
|
|
samplerate_change = softmix_data->internal_rate;
|
|
pos_id = -1;
|
|
if (bridge->softmix.binaural_active) {
|
|
if (strncmp(ast_channel_name(bridge_channel->chan), "CBAnn", 5) != 0) {
|
|
set_binaural = ast_format_get_channel_count(bridge_channel->write_format) > 1 ? 1 : 0;
|
|
if (set_binaural) {
|
|
softmix_data->internal_rate = samplerate_change;
|
|
}
|
|
skip_binaural_output = 0;
|
|
} else {
|
|
is_announcement = 1;
|
|
}
|
|
if (set_binaural) {
|
|
softmix_data->convolve.binaural_active = 1;
|
|
}
|
|
if (!skip_binaural_output) {
|
|
pos_id = set_binaural_data_join(&softmix_data->convolve, softmix_data->default_sample_size);
|
|
if (pos_id == -1) {
|
|
ast_log(LOG_ERROR, "Bridge %s: Failed to join channel %s. "
|
|
"Could not allocate enough memory.\n", bridge->uniqueid,
|
|
ast_channel_name(bridge_channel->chan));
|
|
ast_free(sc);
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Can't forget the lock */
|
|
ast_mutex_init(&sc->lock);
|
|
|
|
/* Can't forget to record our pvt structure within the bridged channel structure */
|
|
bridge_channel->tech_pvt = sc;
|
|
|
|
set_softmix_bridge_data(softmix_data->internal_rate,
|
|
softmix_data->internal_mixing_interval
|
|
? softmix_data->internal_mixing_interval
|
|
: DEFAULT_SOFTMIX_INTERVAL,
|
|
bridge_channel, 0, set_binaural, pos_id, is_announcement);
|
|
|
|
if (bridge->softmix.video_mode.mode == AST_BRIDGE_VIDEO_MODE_SFU) {
|
|
sfu_topologies_on_join(bridge, bridge_channel);
|
|
}
|
|
|
|
/* Complete any active hold before entering, or transitioning to softmix. */
|
|
if (ast_channel_hold_state(bridge_channel->chan) == AST_CONTROL_HOLD) {
|
|
ast_debug(1, "Channel %s simulating UNHOLD for bridge softmix join.\n",
|
|
ast_channel_name(bridge_channel->chan));
|
|
ast_indicate(bridge_channel->chan, AST_CONTROL_UNHOLD);
|
|
}
|
|
|
|
softmix_poke_thread(softmix_data);
|
|
return 0;
|
|
}
|
|
|
|
static int remove_destination_streams(struct ast_stream_topology *topology,
|
|
const char *channel_name)
|
|
{
|
|
int i;
|
|
int stream_removed = 0;
|
|
|
|
for (i = 0; i < ast_stream_topology_get_count(topology); ++i) {
|
|
struct ast_stream *stream;
|
|
|
|
stream = ast_stream_topology_get_stream(topology, i);
|
|
|
|
if (is_video_dest(stream, channel_name, -1)) {
|
|
ast_stream_set_state(stream, AST_STREAM_STATE_REMOVED);
|
|
stream_removed = 1;
|
|
}
|
|
}
|
|
return stream_removed;
|
|
}
|
|
|
|
static int sfu_topologies_on_leave(struct ast_bridge_channel *leaver, struct ast_bridge_channels_list *participants)
|
|
{
|
|
struct ast_bridge_channel *participant;
|
|
struct softmix_channel *sc;
|
|
|
|
AST_LIST_TRAVERSE(participants, participant, entry) {
|
|
sc = participant->tech_pvt;
|
|
if (!remove_destination_streams(sc->topology, ast_channel_name(leaver->chan))) {
|
|
continue;
|
|
}
|
|
ast_channel_request_stream_topology_change(participant->chan, sc->topology, NULL);
|
|
}
|
|
|
|
sc = leaver->tech_pvt;
|
|
if (remove_destination_streams(sc->topology, "")) {
|
|
ast_channel_request_stream_topology_change(leaver->chan, sc->topology, NULL);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*! \brief Function called when a channel leaves the bridge */
|
|
static void softmix_bridge_leave(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
|
|
{
|
|
struct softmix_channel *sc;
|
|
struct softmix_bridge_data *softmix_data;
|
|
|
|
softmix_data = bridge->tech_pvt;
|
|
sc = bridge_channel->tech_pvt;
|
|
if (!sc) {
|
|
return;
|
|
}
|
|
|
|
if (bridge->softmix.video_mode.mode == AST_BRIDGE_VIDEO_MODE_SFU) {
|
|
sfu_topologies_on_leave(bridge_channel, &bridge->channels);
|
|
}
|
|
|
|
if (bridge->softmix.binaural_active) {
|
|
if (sc->binaural) {
|
|
set_binaural_data_leave(&softmix_data->convolve, sc->binaural_pos,
|
|
softmix_data->default_sample_size);
|
|
}
|
|
}
|
|
|
|
bridge_channel->tech_pvt = NULL;
|
|
|
|
ast_stream_topology_free(sc->topology);
|
|
|
|
ao2_cleanup(sc->remb_collector);
|
|
|
|
AST_VECTOR_FREE(&sc->video_sources);
|
|
|
|
/* Drop mutex lock */
|
|
ast_mutex_destroy(&sc->lock);
|
|
|
|
/* Drop the factory */
|
|
ast_slinfactory_destroy(&sc->factory);
|
|
|
|
/* Drop any formats on the frames */
|
|
ao2_cleanup(sc->write_frame.subclass.format);
|
|
|
|
/* Drop the DSP */
|
|
ast_dsp_free(sc->dsp);
|
|
|
|
/* Eep! drop ourselves */
|
|
ast_free(sc);
|
|
}
|
|
|
|
static void softmix_pass_video_top_priority(struct ast_bridge *bridge, struct ast_frame *frame)
|
|
{
|
|
struct ast_bridge_channel *cur;
|
|
|
|
AST_LIST_TRAVERSE(&bridge->channels, cur, entry) {
|
|
if (cur->suspended) {
|
|
continue;
|
|
}
|
|
if (ast_bridge_is_video_src(bridge, cur->chan) == 1) {
|
|
ast_bridge_channel_queue_frame(cur, frame);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*!
|
|
* \internal
|
|
* \brief Determine what to do with a video frame.
|
|
* \since 12.0.0
|
|
*
|
|
* \param bridge Which bridge is getting the frame
|
|
* \param bridge_channel Which channel is writing the frame.
|
|
* \param frame What is being written.
|
|
*
|
|
* \return Nothing
|
|
*/
|
|
static void softmix_bridge_write_video(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel, struct ast_frame *frame)
|
|
{
|
|
struct softmix_channel *sc;
|
|
int video_src_priority;
|
|
|
|
/* Determine if the video frame should be distributed or not */
|
|
switch (bridge->softmix.video_mode.mode) {
|
|
case AST_BRIDGE_VIDEO_MODE_NONE:
|
|
break;
|
|
case AST_BRIDGE_VIDEO_MODE_SINGLE_SRC:
|
|
video_src_priority = ast_bridge_is_video_src(bridge, bridge_channel->chan);
|
|
if (video_src_priority == 1) {
|
|
/* Pass to me and everyone else. */
|
|
ast_bridge_queue_everyone_else(bridge, NULL, frame);
|
|
}
|
|
break;
|
|
case AST_BRIDGE_VIDEO_MODE_TALKER_SRC:
|
|
sc = bridge_channel->tech_pvt;
|
|
ast_mutex_lock(&sc->lock);
|
|
ast_bridge_update_talker_src_video_mode(bridge, bridge_channel->chan,
|
|
sc->video_talker.energy_average,
|
|
frame->subclass.frame_ending);
|
|
ast_mutex_unlock(&sc->lock);
|
|
video_src_priority = ast_bridge_is_video_src(bridge, bridge_channel->chan);
|
|
if (video_src_priority == 1) {
|
|
int num_src = ast_bridge_number_video_src(bridge);
|
|
int echo = num_src > 1 ? 0 : 1;
|
|
|
|
ast_bridge_queue_everyone_else(bridge, echo ? NULL : bridge_channel, frame);
|
|
} else if (video_src_priority == 2) {
|
|
softmix_pass_video_top_priority(bridge, frame);
|
|
}
|
|
break;
|
|
case AST_BRIDGE_VIDEO_MODE_SFU:
|
|
/* Nothing special to do here, the bridge channel stream map will ensure the
|
|
* video goes everywhere it needs to
|
|
*/
|
|
ast_bridge_queue_everyone_else(bridge, bridge_channel, frame);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*!
|
|
* \internal
|
|
* \brief Determine what to do with a voice frame.
|
|
* \since 12.0.0
|
|
*
|
|
* \param bridge Which bridge is getting the frame
|
|
* \param bridge_channel Which channel is writing the frame.
|
|
* \param frame What is being written.
|
|
*
|
|
* \return Nothing
|
|
*/
|
|
static void softmix_bridge_write_voice(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel, struct ast_frame *frame)
|
|
{
|
|
struct softmix_channel *sc = bridge_channel->tech_pvt;
|
|
struct softmix_bridge_data *softmix_data = bridge->tech_pvt;
|
|
int silent = 0;
|
|
int totalsilence = 0;
|
|
int cur_energy = 0;
|
|
int silence_threshold = bridge_channel->tech_args.silence_threshold ?
|
|
bridge_channel->tech_args.silence_threshold :
|
|
DEFAULT_SOFTMIX_SILENCE_THRESHOLD;
|
|
/*
|
|
* If update_talking is set to 0 or 1, tell the bridge that the channel
|
|
* has started or stopped talking.
|
|
*/
|
|
char update_talking = -1;
|
|
|
|
/* Write the frame into the conference */
|
|
ast_mutex_lock(&sc->lock);
|
|
|
|
if (ast_format_cmp(frame->subclass.format, sc->read_slin_format) != AST_FORMAT_CMP_EQUAL) {
|
|
/*
|
|
* The incoming frame is not the expected format. Update
|
|
* the channel's translation path to get us slinear from
|
|
* the new format for the next frame.
|
|
*
|
|
* There is the possibility that this frame is an old slinear
|
|
* rate frame that was in flight when the softmix bridge
|
|
* changed rates. If so it will self correct on subsequent
|
|
* frames.
|
|
*/
|
|
ast_channel_lock(bridge_channel->chan);
|
|
ast_debug(1, "Channel %s wrote unexpected format into bridge. Got %s, expected %s.\n",
|
|
ast_channel_name(bridge_channel->chan),
|
|
ast_format_get_name(frame->subclass.format),
|
|
ast_format_get_name(sc->read_slin_format));
|
|
ast_set_read_format_path(bridge_channel->chan, frame->subclass.format,
|
|
sc->read_slin_format);
|
|
ast_channel_unlock(bridge_channel->chan);
|
|
}
|
|
|
|
/* The channel will be leaving soon if there is no dsp. */
|
|
if (sc->dsp) {
|
|
silent = ast_dsp_silence_with_energy(sc->dsp, frame, &totalsilence, &cur_energy);
|
|
}
|
|
|
|
if (bridge->softmix.video_mode.mode == AST_BRIDGE_VIDEO_MODE_TALKER_SRC) {
|
|
int cur_slot = sc->video_talker.energy_history_cur_slot;
|
|
|
|
sc->video_talker.energy_accum -= sc->video_talker.energy_history[cur_slot];
|
|
sc->video_talker.energy_accum += cur_energy;
|
|
sc->video_talker.energy_history[cur_slot] = cur_energy;
|
|
sc->video_talker.energy_average = sc->video_talker.energy_accum / DEFAULT_ENERGY_HISTORY_LEN;
|
|
sc->video_talker.energy_history_cur_slot++;
|
|
if (sc->video_talker.energy_history_cur_slot == DEFAULT_ENERGY_HISTORY_LEN) {
|
|
sc->video_talker.energy_history_cur_slot = 0; /* wrap around */
|
|
}
|
|
}
|
|
|
|
if (totalsilence < silence_threshold) {
|
|
if (!sc->talking && !silent) {
|
|
/* Tell the write process we have audio to be mixed out */
|
|
sc->talking = 1;
|
|
update_talking = 1;
|
|
}
|
|
} else {
|
|
if (sc->talking) {
|
|
sc->talking = 0;
|
|
update_talking = 0;
|
|
}
|
|
}
|
|
|
|
/* Before adding audio in, make sure we haven't fallen behind. If audio has fallen
|
|
* behind 4 times the amount of samples mixed on every iteration of the mixer, Re-sync
|
|
* the audio by flushing the buffer before adding new audio in. */
|
|
if (ast_slinfactory_available(&sc->factory) > (4 * SOFTMIX_SAMPLES(softmix_data->internal_rate, softmix_data->internal_mixing_interval))) {
|
|
ast_slinfactory_flush(&sc->factory);
|
|
}
|
|
|
|
if (sc->talking || !bridge_channel->tech_args.drop_silence) {
|
|
/* Add frame to the smoother for mixing with other channels. */
|
|
ast_slinfactory_feed(&sc->factory, frame);
|
|
}
|
|
|
|
/* Alllll done */
|
|
ast_mutex_unlock(&sc->lock);
|
|
|
|
if (update_talking != -1) {
|
|
ast_bridge_channel_notify_talking(bridge_channel, update_talking);
|
|
}
|
|
}
|
|
|
|
/*!
|
|
* \internal
|
|
* \brief Clear talking flag, stop contributing to mixing and notify handlers.
|
|
* \since 13.21.0, 15.4.0
|
|
*
|
|
* \param bridge_channel Which channel's talking to clear
|
|
*
|
|
* \return Nothing
|
|
*/
|
|
static void clear_talking(struct ast_bridge_channel *bridge_channel)
|
|
{
|
|
struct softmix_channel *sc = bridge_channel->tech_pvt;
|
|
|
|
if (sc->talking) {
|
|
ast_mutex_lock(&sc->lock);
|
|
ast_slinfactory_flush(&sc->factory);
|
|
sc->talking = 0;
|
|
ast_mutex_unlock(&sc->lock);
|
|
|
|
/* Notify that we are no longer talking. */
|
|
ast_bridge_channel_notify_talking(bridge_channel, 0);
|
|
}
|
|
}
|
|
|
|
/*!
|
|
* \internal
|
|
* \brief Check for voice status updates.
|
|
* \since 13.20.0
|
|
*
|
|
* \param bridge Which bridge we are in
|
|
* \param bridge_channel Which channel we are checking
|
|
*
|
|
* \return Nothing
|
|
*/
|
|
static void softmix_bridge_check_voice(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
|
|
{
|
|
if (bridge_channel->features->mute) {
|
|
/*
|
|
* We were muted while we were talking.
|
|
*
|
|
* Immediately stop contributing to mixing
|
|
* and report no longer talking.
|
|
*/
|
|
clear_talking(bridge_channel);
|
|
}
|
|
}
|
|
|
|
static int remove_all_original_streams(struct ast_stream_topology *dest,
|
|
const struct ast_stream_topology *source,
|
|
const struct ast_stream_topology *original)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ast_stream_topology_get_count(source); ++i) {
|
|
struct ast_stream *stream;
|
|
int original_index;
|
|
|
|
stream = ast_stream_topology_get_stream(source, i);
|
|
|
|
/* Mark the existing stream as removed so we get a new one, this will get
|
|
* reused on a subsequent renegotiation.
|
|
*/
|
|
for (original_index = 0; original_index < ast_stream_topology_get_count(original); ++original_index) {
|
|
struct ast_stream *original_stream = ast_stream_topology_get_stream(original, original_index);
|
|
|
|
if (!strcmp(ast_stream_get_name(stream), ast_stream_get_name(original_stream))) {
|
|
struct ast_stream *removed;
|
|
|
|
/* Since the participant is still going to be in the bridge we
|
|
* change the name so that routing does not attempt to route video
|
|
* to this stream.
|
|
*/
|
|
removed = ast_stream_clone(stream, "removed");
|
|
if (!removed) {
|
|
return -1;
|
|
}
|
|
|
|
ast_stream_set_state(removed, AST_STREAM_STATE_REMOVED);
|
|
|
|
/* The destination topology can only ever contain the same, or more,
|
|
* streams than the original so this is safe.
|
|
*/
|
|
if (ast_stream_topology_set_stream(dest, original_index, removed)) {
|
|
ast_stream_free(removed);
|
|
return -1;
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void sfu_topologies_on_source_change(struct ast_bridge *bridge,
|
|
struct ast_bridge_channel *source)
|
|
{
|
|
struct ast_stream_topology *source_video = NULL;
|
|
struct ast_bridge_channels_list *participants = &bridge->channels;
|
|
struct ast_bridge_channel *participant;
|
|
int res;
|
|
|
|
source_video = ast_stream_topology_alloc();
|
|
if (!source_video) {
|
|
return;
|
|
}
|
|
|
|
ast_channel_lock(source->chan);
|
|
res = append_source_streams(source_video, ast_channel_name(source->chan),
|
|
bridge->softmix.send_sdp_label ? ast_channel_uniqueid(source->chan) : NULL,
|
|
ast_channel_get_stream_topology(source->chan));
|
|
ast_channel_unlock(source->chan);
|
|
if (res) {
|
|
goto cleanup;
|
|
}
|
|
|
|
AST_LIST_TRAVERSE(participants, participant, entry) {
|
|
struct ast_stream_topology *original_topology;
|
|
struct softmix_channel *sc;
|
|
|
|
if (participant == source) {
|
|
continue;
|
|
}
|
|
|
|
sc = participant->tech_pvt;
|
|
|
|
original_topology = ast_stream_topology_clone(sc->topology);
|
|
if (!original_topology) {
|
|
goto cleanup;
|
|
}
|
|
|
|
/* We add all the source streams back in, if any removed streams are already present they will
|
|
* get used first followed by appending new ones.
|
|
*/
|
|
if (append_all_streams(sc->topology, source_video)) {
|
|
ast_stream_topology_free(original_topology);
|
|
goto cleanup;
|
|
}
|
|
|
|
/* And the original existing streams get marked as removed. This causes the remote side to see
|
|
* a new stream for the source streams.
|
|
*/
|
|
if (remove_all_original_streams(sc->topology, source_video, original_topology)) {
|
|
ast_stream_topology_free(original_topology);
|
|
goto cleanup;
|
|
}
|
|
|
|
ast_channel_request_stream_topology_change(participant->chan, sc->topology, NULL);
|
|
ast_stream_topology_free(original_topology);
|
|
}
|
|
|
|
cleanup:
|
|
ast_stream_topology_free(source_video);
|
|
}
|
|
|
|
/*!
|
|
* \internal
|
|
* \brief Determine what to do with a text frame.
|
|
* \since 13.22.0
|
|
* \since 15.5.0
|
|
*
|
|
* \param bridge Which bridge is getting the frame
|
|
* \param bridge_channel Which channel is writing the frame.
|
|
* \param frame What is being written.
|
|
*
|
|
* \return Nothing
|
|
*/
|
|
static void softmix_bridge_write_text(struct ast_bridge *bridge,
|
|
struct ast_bridge_channel *bridge_channel, struct ast_frame *frame)
|
|
{
|
|
if (DEBUG_ATLEAST(1)) {
|
|
struct ast_msg_data *msg = frame->data.ptr;
|
|
char frame_type[64];
|
|
|
|
ast_frame_type2str(frame->frametype, frame_type, sizeof(frame_type));
|
|
|
|
if (frame->frametype == AST_FRAME_TEXT_DATA) {
|
|
ast_log(LOG_DEBUG, "Received %s frame from '%s:%s': %s\n", frame_type,
|
|
ast_msg_data_get_attribute(msg, AST_MSG_DATA_ATTR_FROM),
|
|
ast_channel_name(bridge_channel->chan),
|
|
ast_msg_data_get_attribute(msg, AST_MSG_DATA_ATTR_BODY));
|
|
} else {
|
|
ast_log(LOG_DEBUG, "Received %s frame from '%s': %.*s\n", frame_type,
|
|
ast_channel_name(bridge_channel->chan), frame->datalen,
|
|
(char *)frame->data.ptr);
|
|
}
|
|
}
|
|
|
|
ast_bridge_queue_everyone_else(bridge, bridge_channel, frame);
|
|
}
|
|
|
|
/*!
|
|
* \internal
|
|
* \brief Determine what to do with a control frame.
|
|
* \since 12.0.0
|
|
*
|
|
* \param bridge Which bridge is getting the frame
|
|
* \param bridge_channel Which channel is writing the frame.
|
|
* \param frame What is being written.
|
|
*
|
|
* \retval 0 Frame accepted into the bridge.
|
|
* \retval -1 Frame needs to be deferred.
|
|
*/
|
|
static int softmix_bridge_write_control(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel, struct ast_frame *frame)
|
|
{
|
|
struct softmix_bridge_data *softmix_data = bridge->tech_pvt;
|
|
|
|
/*
|
|
* XXX Softmix needs to use channel roles to determine what to
|
|
* do with control frames.
|
|
*/
|
|
|
|
switch (frame->subclass.integer) {
|
|
case AST_CONTROL_HOLD:
|
|
/*
|
|
* Doing anything for holds in a conference bridge could be considered a bit
|
|
* odd. That being said, in most cases one would probably want the talking
|
|
* flag cleared when 'hold' is pressed by the remote endpoint, so go ahead
|
|
* and do that here. However, that is all we'll do. Meaning if for some reason
|
|
* the endpoint continues to send audio frames despite pressing 'hold' talking
|
|
* will once again be detected for that channel.
|
|
*/
|
|
clear_talking(bridge_channel);
|
|
break;
|
|
case AST_CONTROL_VIDUPDATE:
|
|
if (!bridge->softmix.video_mode.video_update_discard ||
|
|
ast_tvdiff_ms(ast_tvnow(), softmix_data->last_video_update) > bridge->softmix.video_mode.video_update_discard) {
|
|
ast_bridge_queue_everyone_else(bridge, NULL, frame);
|
|
softmix_data->last_video_update = ast_tvnow();
|
|
}
|
|
break;
|
|
case AST_CONTROL_STREAM_TOPOLOGY_SOURCE_CHANGED:
|
|
if (bridge->softmix.video_mode.mode == AST_BRIDGE_VIDEO_MODE_SFU) {
|
|
sfu_topologies_on_source_change(bridge, bridge_channel);
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*!
|
|
* \internal
|
|
* \brief Determine what to do with an RTCP frame.
|
|
* \since 15.4.0
|
|
*
|
|
* \param bridge Which bridge is getting the frame
|
|
* \param bridge_channel Which channel is writing the frame.
|
|
* \param frame What is being written.
|
|
*/
|
|
static void softmix_bridge_write_rtcp(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel, struct ast_frame *frame)
|
|
{
|
|
struct ast_rtp_rtcp_feedback *feedback = frame->data.ptr;
|
|
struct softmix_channel *sc = bridge_channel->tech_pvt;
|
|
|
|
/* We only care about REMB reports right now. In the future we may be able to use sender or
|
|
* receiver reports to further tweak things, but not yet.
|
|
*/
|
|
if (frame->subclass.integer != AST_RTP_RTCP_PSFB || feedback->fmt != AST_RTP_RTCP_FMT_REMB ||
|
|
bridge->softmix.video_mode.mode != AST_BRIDGE_VIDEO_MODE_SFU ||
|
|
!bridge->softmix.video_mode.mode_data.sfu_data.remb_send_interval) {
|
|
return;
|
|
}
|
|
|
|
/* REMB is the total estimated maximum bitrate across all streams within the session, so we store
|
|
* only the latest report and use it everywhere.
|
|
*/
|
|
ast_mutex_lock(&sc->lock);
|
|
sc->remb = feedback->remb;
|
|
ast_mutex_unlock(&sc->lock);
|
|
|
|
return;
|
|
}
|
|
|
|
/*!
|
|
* \internal
|
|
* \brief Determine what to do with a frame written into the bridge.
|
|
* \since 12.0.0
|
|
*
|
|
* \param bridge Which bridge is getting the frame
|
|
* \param bridge_channel Which channel is writing the frame.
|
|
* \param frame What is being written.
|
|
*
|
|
* \retval 0 Frame accepted into the bridge.
|
|
* \retval -1 Frame needs to be deferred.
|
|
*
|
|
* \note On entry, bridge is already locked.
|
|
*/
|
|
static int softmix_bridge_write(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel, struct ast_frame *frame)
|
|
{
|
|
int res = 0;
|
|
|
|
if (!bridge->tech_pvt || !bridge_channel || !bridge_channel->tech_pvt) {
|
|
/* "Accept" the frame and discard it. */
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* XXX Softmix needs to use channel roles to determine who gets
|
|
* what frame. Possible roles: announcer, recorder, agent,
|
|
* supervisor.
|
|
*/
|
|
switch (frame->frametype) {
|
|
case AST_FRAME_NULL:
|
|
/* "Accept" the frame and discard it. */
|
|
softmix_bridge_check_voice(bridge, bridge_channel);
|
|
break;
|
|
case AST_FRAME_DTMF_BEGIN:
|
|
case AST_FRAME_DTMF_END:
|
|
res = ast_bridge_queue_everyone_else(bridge, bridge_channel, frame);
|
|
break;
|
|
case AST_FRAME_VOICE:
|
|
softmix_bridge_write_voice(bridge, bridge_channel, frame);
|
|
break;
|
|
case AST_FRAME_VIDEO:
|
|
softmix_bridge_write_video(bridge, bridge_channel, frame);
|
|
break;
|
|
case AST_FRAME_TEXT:
|
|
case AST_FRAME_TEXT_DATA:
|
|
softmix_bridge_write_text(bridge, bridge_channel, frame);
|
|
break;
|
|
case AST_FRAME_CONTROL:
|
|
res = softmix_bridge_write_control(bridge, bridge_channel, frame);
|
|
break;
|
|
case AST_FRAME_RTCP:
|
|
softmix_bridge_write_rtcp(bridge, bridge_channel, frame);
|
|
break;
|
|
case AST_FRAME_BRIDGE_ACTION:
|
|
res = ast_bridge_queue_everyone_else(bridge, bridge_channel, frame);
|
|
break;
|
|
case AST_FRAME_BRIDGE_ACTION_SYNC:
|
|
ast_log(LOG_ERROR, "Synchronous bridge action written to a softmix bridge.\n");
|
|
ast_assert(0);
|
|
default:
|
|
ast_debug(3, "Frame type %u unsupported\n", frame->frametype);
|
|
/* "Accept" the frame and discard it. */
|
|
break;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static void remb_collect_report_all(struct ast_bridge *bridge, struct softmix_bridge_data *softmix_data,
|
|
float bitrate)
|
|
{
|
|
if (!softmix_data->bitrate) {
|
|
softmix_data->bitrate = bitrate;
|
|
return;
|
|
}
|
|
|
|
switch (bridge->softmix.video_mode.mode_data.sfu_data.remb_behavior) {
|
|
case AST_BRIDGE_VIDEO_SFU_REMB_AVERAGE_ALL:
|
|
softmix_data->bitrate = (softmix_data->bitrate + bitrate) / 2;
|
|
break;
|
|
case AST_BRIDGE_VIDEO_SFU_REMB_LOWEST_ALL:
|
|
if (bitrate < softmix_data->bitrate) {
|
|
softmix_data->bitrate = bitrate;
|
|
}
|
|
break;
|
|
case AST_BRIDGE_VIDEO_SFU_REMB_HIGHEST_ALL:
|
|
if (bitrate > softmix_data->bitrate) {
|
|
softmix_data->bitrate = bitrate;
|
|
}
|
|
break;
|
|
case AST_BRIDGE_VIDEO_SFU_REMB_AVERAGE:
|
|
case AST_BRIDGE_VIDEO_SFU_REMB_LOWEST:
|
|
case AST_BRIDGE_VIDEO_SFU_REMB_HIGHEST:
|
|
/* These will never actually get hit due to being handled by remb_collect_report below */
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void remb_collect_report(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel,
|
|
struct softmix_bridge_data *softmix_data, struct softmix_channel *sc)
|
|
{
|
|
int i;
|
|
float bitrate;
|
|
|
|
/* If there are no video sources that we are a receiver of then we have noone to
|
|
* report REMB to.
|
|
*/
|
|
if (!AST_VECTOR_SIZE(&sc->video_sources)) {
|
|
return;
|
|
}
|
|
|
|
/* We evenly divide the available maximum bitrate across the video sources
|
|
* to this receiver so each source gets an equal slice.
|
|
*/
|
|
bitrate = (sc->remb.br_mantissa << sc->remb.br_exp) / AST_VECTOR_SIZE(&sc->video_sources);
|
|
|
|
/* If this receiver has no bitrate yet ignore it */
|
|
if (!bitrate) {
|
|
return;
|
|
}
|
|
|
|
/* If we are using the "all" variants then we should use the bridge bitrate to store information */
|
|
if (bridge->softmix.video_mode.mode_data.sfu_data.remb_behavior == AST_BRIDGE_VIDEO_SFU_REMB_AVERAGE_ALL ||
|
|
bridge->softmix.video_mode.mode_data.sfu_data.remb_behavior == AST_BRIDGE_VIDEO_SFU_REMB_LOWEST_ALL ||
|
|
bridge->softmix.video_mode.mode_data.sfu_data.remb_behavior == AST_BRIDGE_VIDEO_SFU_REMB_HIGHEST_ALL) {
|
|
remb_collect_report_all(bridge, softmix_data, bitrate);
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < AST_VECTOR_SIZE(&sc->video_sources); ++i) {
|
|
struct softmix_remb_collector *collector;
|
|
|
|
/* The collector will always exist if a video source is in our list */
|
|
collector = AST_VECTOR_GET(&softmix_data->remb_collectors, AST_VECTOR_GET(&sc->video_sources, i));
|
|
|
|
if (!collector->bitrate) {
|
|
collector->bitrate = bitrate;
|
|
continue;
|
|
}
|
|
|
|
switch (bridge->softmix.video_mode.mode_data.sfu_data.remb_behavior) {
|
|
case AST_BRIDGE_VIDEO_SFU_REMB_AVERAGE:
|
|
collector->bitrate = (collector->bitrate + bitrate) / 2;
|
|
break;
|
|
case AST_BRIDGE_VIDEO_SFU_REMB_LOWEST:
|
|
if (bitrate < collector->bitrate) {
|
|
collector->bitrate = bitrate;
|
|
}
|
|
break;
|
|
case AST_BRIDGE_VIDEO_SFU_REMB_HIGHEST:
|
|
if (bitrate > collector->bitrate) {
|
|
collector->bitrate = bitrate;
|
|
}
|
|
break;
|
|
case AST_BRIDGE_VIDEO_SFU_REMB_AVERAGE_ALL:
|
|
case AST_BRIDGE_VIDEO_SFU_REMB_LOWEST_ALL:
|
|
case AST_BRIDGE_VIDEO_SFU_REMB_HIGHEST_ALL:
|
|
/* These will never actually get hit due to being handled by remb_collect_report_all above */
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* After the report is integrated we reset this to 0 in case they stop producing
|
|
* REMB reports.
|
|
*/
|
|
sc->remb.br_mantissa = 0;
|
|
sc->remb.br_exp = 0;
|
|
}
|
|
|
|
static void remb_send_report(struct ast_bridge_channel *bridge_channel, struct softmix_bridge_data *softmix_data,
|
|
struct softmix_channel *sc)
|
|
{
|
|
float bitrate = softmix_data->bitrate;
|
|
int i;
|
|
int exp;
|
|
|
|
if (!sc->remb_collector) {
|
|
return;
|
|
}
|
|
|
|
/* If there is no bridge level bitrate fall back to collector level */
|
|
if (!bitrate) {
|
|
bitrate = sc->remb_collector->bitrate;
|
|
sc->remb_collector->bitrate = 0;
|
|
}
|
|
|
|
/* We always do this calculation as even when the bitrate is zero the browser
|
|
* still prefers it to be accurate instead of lying.
|
|
*
|
|
* The mantissa only has 18 bits available, so make sure it fits. Adjust the
|
|
* value and exponent for those values that don't.
|
|
*
|
|
* For example given the following:
|
|
*
|
|
* bitrate = 123456789.0
|
|
* frexp(bitrate, &exp);
|
|
*
|
|
* 'exp' should now equal 27 (number of bits needed to represent the value). Since
|
|
* the mantissa must fit into an 18-bit unsigned integer, and the given bitrate is
|
|
* too large to fit, we must subtract 18 from the exponent in order to get the
|
|
* number of times the bitrate will fit into that size integer.
|
|
*
|
|
* exp -= 18;
|
|
*
|
|
* 'exp' is now equal to 9. Now we can get the mantissa that fits into an 18-bit
|
|
* unsigned integer by dividing the bitrate by 2^exp:
|
|
*
|
|
* mantissa = 123456789.0 / 2^9
|
|
*
|
|
* This makes the final mantissa equal to 241126 (implicitly cast), which is less
|
|
* than 262143 (the max value that can be put into an unsigned 18-bit integer).
|
|
* So now we have the following:
|
|
*
|
|
* exp = 9;
|
|
* mantissa = 241126;
|
|
*
|
|
* If we multiply that back we should come up with something close to the original
|
|
* bit rate:
|
|
*
|
|
* 241126 * 2^9 = 123456512
|
|
*
|
|
* Precision is lost due to the nature of floating point values. Easier to why from
|
|
* the binary:
|
|
*
|
|
* 241126 * 2^9 = 241126 << 9 = 111010110111100110 << 9 = 111010110111100110000000000
|
|
*
|
|
* Precision on the "lower" end is lost due to zeros being shifted in. This loss is
|
|
* both expected and acceptable.
|
|
*/
|
|
frexp(bitrate, &exp);
|
|
exp = exp > 18 ? exp - 18 : 0;
|
|
|
|
sc->remb_collector->feedback.remb.br_mantissa = bitrate / (1 << exp);
|
|
sc->remb_collector->feedback.remb.br_exp = exp;
|
|
|
|
for (i = 0; i < AST_VECTOR_SIZE(&bridge_channel->stream_map.to_bridge); ++i) {
|
|
int bridge_num = AST_VECTOR_GET(&bridge_channel->stream_map.to_bridge, i);
|
|
|
|
/* If this stream is not being provided to the bridge there can be no receivers of it
|
|
* so therefore no REMB reports.
|
|
*/
|
|
if (bridge_num == -1) {
|
|
continue;
|
|
}
|
|
|
|
/* We need to update the frame with this stream, or else it won't be
|
|
* properly routed. We don't use the actual channel stream identifier as
|
|
* the bridging core will do the translation from bridge stream identifier to
|
|
* channel stream identifier.
|
|
*/
|
|
sc->remb_collector->frame.stream_num = bridge_num;
|
|
ast_bridge_channel_queue_frame(bridge_channel, &sc->remb_collector->frame);
|
|
}
|
|
}
|
|
|
|
static void gather_softmix_stats(struct softmix_stats *stats,
|
|
const struct softmix_bridge_data *softmix_data,
|
|
struct ast_bridge_channel *bridge_channel)
|
|
{
|
|
int channel_native_rate;
|
|
|
|
/* Gather stats about channel sample rates. */
|
|
ast_channel_lock(bridge_channel->chan);
|
|
channel_native_rate = MAX(SOFTMIX_MIN_SAMPLE_RATE,
|
|
ast_format_get_sample_rate(ast_channel_rawreadformat(bridge_channel->chan)));
|
|
ast_channel_unlock(bridge_channel->chan);
|
|
|
|
if (stats->highest_supported_rate < channel_native_rate) {
|
|
stats->highest_supported_rate = channel_native_rate;
|
|
}
|
|
if (stats->maximum_rate && stats->maximum_rate < channel_native_rate) {
|
|
stats->num_above_maximum_rate++;
|
|
} else if (softmix_data->internal_rate < channel_native_rate) {
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_LEN(stats->sample_rates); i++) {
|
|
if (stats->sample_rates[i] == channel_native_rate) {
|
|
stats->num_channels[i]++;
|
|
break;
|
|
} else if (!stats->sample_rates[i]) {
|
|
stats->sample_rates[i] = channel_native_rate;
|
|
stats->num_channels[i]++;
|
|
break;
|
|
}
|
|
}
|
|
stats->num_above_internal_rate++;
|
|
} else if (softmix_data->internal_rate == channel_native_rate) {
|
|
stats->num_at_internal_rate++;
|
|
}
|
|
}
|
|
|
|
/*!
|
|
* \internal
|
|
* \brief Analyse mixing statistics and change bridges internal rate
|
|
* if necessary.
|
|
*
|
|
* \retval 0, no changes to internal rate
|
|
* \retval 1, internal rate was changed, update all the channels on the next mixing iteration.
|
|
*/
|
|
static unsigned int analyse_softmix_stats(struct softmix_stats *stats,
|
|
struct softmix_bridge_data *softmix_data, int binaural_active)
|
|
{
|
|
int i;
|
|
|
|
if (binaural_active) {
|
|
stats->locked_rate = SOFTMIX_BINAURAL_SAMPLE_RATE;
|
|
}
|
|
|
|
/*
|
|
* Re-adjust the internal bridge sample rate if
|
|
* 1. The bridge's internal sample rate is locked in at a sample
|
|
* rate other than the current sample rate being used.
|
|
* 2. two or more channels support a higher sample rate
|
|
* 3. no channels support the current sample rate or a higher rate
|
|
*/
|
|
if (stats->locked_rate) {
|
|
/* if the rate is locked by the bridge, only update it if it differs
|
|
* from the current rate we are using. */
|
|
if (softmix_data->internal_rate != stats->locked_rate) {
|
|
ast_debug(1, "Locking at new rate. Bridge changed from %u to %u.\n",
|
|
softmix_data->internal_rate, stats->locked_rate);
|
|
softmix_data->internal_rate = stats->locked_rate;
|
|
return 1;
|
|
}
|
|
} else if (stats->num_above_maximum_rate) {
|
|
/* if the bridge has a maximum rate set and channels are above it only
|
|
* update if it differs from the current rate we are using. */
|
|
if (softmix_data->internal_rate != stats->maximum_rate) {
|
|
ast_debug(1, "Locking at new maximum rate. Bridge changed from %u to %u.\n",
|
|
softmix_data->internal_rate, stats->maximum_rate);
|
|
softmix_data->internal_rate = stats->maximum_rate;
|
|
return 1;
|
|
}
|
|
} else if (stats->num_above_internal_rate >= 2) {
|
|
/* the highest rate is just used as a starting point */
|
|
unsigned int best_rate = stats->highest_supported_rate;
|
|
int best_index = -1;
|
|
|
|
for (i = 0; i < ARRAY_LEN(stats->num_channels); i++) {
|
|
if (stats->num_channels[i]) {
|
|
break;
|
|
}
|
|
if (2 <= stats->num_channels[i]) {
|
|
/* Two or more channels support this rate. */
|
|
if (best_index == -1
|
|
|| stats->sample_rates[best_index] < stats->sample_rates[i]) {
|
|
/*
|
|
* best_rate starts out being the first sample rate
|
|
* greater than the internal sample rate that two or
|
|
* more channels support.
|
|
*
|
|
* or
|
|
*
|
|
* There are multiple rates above the internal rate
|
|
* and this rate is higher than the previous rate two
|
|
* or more channels support.
|
|
*/
|
|
best_rate = stats->sample_rates[i];
|
|
best_index = i;
|
|
}
|
|
} else if (best_index == -1) {
|
|
/*
|
|
* It is possible that multiple channels exist with native sample
|
|
* rates above the internal sample rate, but none of those channels
|
|
* have the same rate in common. In this case, the lowest sample
|
|
* rate among those channels is picked. Over time as additional
|
|
* statistic runs are made the internal sample rate number will
|
|
* adjust to the most optimal sample rate, but it may take multiple
|
|
* iterations.
|
|
*/
|
|
best_rate = MIN(best_rate, stats->sample_rates[i]);
|
|
}
|
|
}
|
|
|
|
ast_debug(1, "Multiple above internal rate. Bridge changed from %u to %u.\n",
|
|
softmix_data->internal_rate, best_rate);
|
|
softmix_data->internal_rate = best_rate;
|
|
return 1;
|
|
} else if (!stats->num_at_internal_rate && !stats->num_above_internal_rate) {
|
|
/* In this case, the highest supported rate is actually lower than the internal rate */
|
|
ast_debug(1, "All below internal rate. Bridge changed from %u to %u.\n",
|
|
softmix_data->internal_rate, stats->highest_supported_rate);
|
|
softmix_data->internal_rate = stats->highest_supported_rate;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int softmix_mixing_array_init(struct softmix_mixing_array *mixing_array,
|
|
unsigned int starting_num_entries, unsigned int binaural_active)
|
|
{
|
|
memset(mixing_array, 0, sizeof(*mixing_array));
|
|
mixing_array->max_num_entries = starting_num_entries;
|
|
if (!(mixing_array->buffers = ast_calloc(mixing_array->max_num_entries, sizeof(int16_t *)))) {
|
|
ast_log(LOG_NOTICE, "Failed to allocate softmix mixing structure.\n");
|
|
return -1;
|
|
}
|
|
if (binaural_active) {
|
|
if (!(mixing_array->chan_pairs = ast_calloc(mixing_array->max_num_entries,
|
|
sizeof(struct convolve_channel_pair *)))) {
|
|
ast_log(LOG_NOTICE, "Failed to allocate softmix mixing structure.\n");
|
|
return -1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void softmix_mixing_array_destroy(struct softmix_mixing_array *mixing_array,
|
|
unsigned int binaural_active)
|
|
{
|
|
ast_free(mixing_array->buffers);
|
|
if (binaural_active) {
|
|
ast_free(mixing_array->chan_pairs);
|
|
}
|
|
}
|
|
|
|
static int softmix_mixing_array_grow(struct softmix_mixing_array *mixing_array,
|
|
unsigned int num_entries, unsigned int binaural_active)
|
|
{
|
|
int16_t **tmp;
|
|
|
|
/* give it some room to grow since memory is cheap but allocations can be expensive */
|
|
mixing_array->max_num_entries = num_entries;
|
|
if (!(tmp = ast_realloc(mixing_array->buffers, (mixing_array->max_num_entries * sizeof(int16_t *))))) {
|
|
ast_log(LOG_NOTICE, "Failed to re-allocate softmix mixing structure.\n");
|
|
return -1;
|
|
}
|
|
mixing_array->buffers = tmp;
|
|
|
|
if (binaural_active) {
|
|
struct convolve_channel_pair **tmp2;
|
|
if (!(tmp2 = ast_realloc(mixing_array->chan_pairs,
|
|
(mixing_array->max_num_entries * sizeof(struct convolve_channel_pair *))))) {
|
|
ast_log(LOG_NOTICE, "Failed to re-allocate softmix mixing structure.\n");
|
|
return -1;
|
|
}
|
|
mixing_array->chan_pairs = tmp2;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*!
|
|
* \brief Mixing loop.
|
|
*
|
|
* \retval 0 on success
|
|
* \retval -1 on failure
|
|
*/
|
|
static int softmix_mixing_loop(struct ast_bridge *bridge)
|
|
{
|
|
struct softmix_stats stats = { { 0 }, };
|
|
struct softmix_mixing_array mixing_array;
|
|
struct softmix_bridge_data *softmix_data = bridge->tech_pvt;
|
|
struct ast_timer *timer;
|
|
struct softmix_translate_helper trans_helper;
|
|
int16_t buf[MAX_DATALEN];
|
|
#ifdef BINAURAL_RENDERING
|
|
int16_t bin_buf[MAX_DATALEN];
|
|
int16_t ann_buf[MAX_DATALEN];
|
|
#endif
|
|
unsigned int stat_iteration_counter = 0; /* counts down, gather stats at zero and reset. */
|
|
int timingfd;
|
|
int update_all_rates = 0; /* set this when the internal sample rate has changed */
|
|
unsigned int idx;
|
|
unsigned int x;
|
|
int res = -1;
|
|
|
|
timer = softmix_data->timer;
|
|
timingfd = ast_timer_fd(timer);
|
|
softmix_translate_helper_init(&trans_helper, softmix_data->internal_rate);
|
|
ast_timer_set_rate(timer, (1000 / softmix_data->internal_mixing_interval));
|
|
|
|
/* Give the mixing array room to grow, memory is cheap but allocations are expensive. */
|
|
if (softmix_mixing_array_init(&mixing_array, bridge->num_channels + 10,
|
|
bridge->softmix.binaural_active)) {
|
|
goto softmix_cleanup;
|
|
}
|
|
|
|
/*
|
|
* XXX Softmix needs to use channel roles to determine who gets
|
|
* what audio mixed.
|
|
*/
|
|
while (!softmix_data->stop && bridge->num_active) {
|
|
struct ast_bridge_channel *bridge_channel;
|
|
int timeout = -1;
|
|
struct ast_format *cur_slin = ast_format_cache_get_slin_by_rate(softmix_data->internal_rate);
|
|
unsigned int softmix_samples = SOFTMIX_SAMPLES(softmix_data->internal_rate, softmix_data->internal_mixing_interval);
|
|
unsigned int softmix_datalen = SOFTMIX_DATALEN(softmix_data->internal_rate, softmix_data->internal_mixing_interval);
|
|
int remb_update = 0;
|
|
|
|
if (softmix_datalen > MAX_DATALEN) {
|
|
/* This should NEVER happen, but if it does we need to know about it. Almost
|
|
* all the memcpys used during this process depend on this assumption. Rather
|
|
* than checking this over and over again through out the code, this single
|
|
* verification is done on each iteration. */
|
|
ast_log(LOG_WARNING,
|
|
"Bridge %s: Conference mixing error, requested mixing length greater than mixing buffer.\n",
|
|
bridge->uniqueid);
|
|
goto softmix_cleanup;
|
|
}
|
|
|
|
/* Grow the mixing array buffer as participants are added. */
|
|
if (mixing_array.max_num_entries < bridge->num_channels
|
|
&& softmix_mixing_array_grow(&mixing_array, bridge->num_channels + 5,
|
|
bridge->softmix.binaural_active)) {
|
|
goto softmix_cleanup;
|
|
}
|
|
|
|
/* init the number of buffers stored in the mixing array to 0.
|
|
* As buffers are added for mixing, this number is incremented. */
|
|
mixing_array.used_entries = 0;
|
|
|
|
/* These variables help determine if a rate change is required */
|
|
if (!stat_iteration_counter) {
|
|
memset(&stats, 0, sizeof(stats));
|
|
stats.locked_rate = bridge->softmix.internal_sample_rate;
|
|
stats.maximum_rate = bridge->softmix.maximum_sample_rate;
|
|
}
|
|
|
|
/* If the sample rate has changed, update the translator helper */
|
|
if (update_all_rates) {
|
|
softmix_translate_helper_change_rate(&trans_helper, softmix_data->internal_rate);
|
|
}
|
|
|
|
#ifdef BINAURAL_RENDERING
|
|
check_binaural_position_change(bridge, softmix_data);
|
|
#endif
|
|
|
|
/* If we need to do a REMB update to all video sources then do so */
|
|
if (bridge->softmix.video_mode.mode == AST_BRIDGE_VIDEO_MODE_SFU &&
|
|
bridge->softmix.video_mode.mode_data.sfu_data.remb_send_interval &&
|
|
ast_tvdiff_ms(ast_tvnow(), softmix_data->last_remb_update) > bridge->softmix.video_mode.mode_data.sfu_data.remb_send_interval) {
|
|
remb_update = 1;
|
|
softmix_data->last_remb_update = ast_tvnow();
|
|
}
|
|
|
|
/* Go through pulling audio from each factory that has it available */
|
|
AST_LIST_TRAVERSE(&bridge->channels, bridge_channel, entry) {
|
|
struct softmix_channel *sc = bridge_channel->tech_pvt;
|
|
|
|
if (!sc) {
|
|
/* This channel failed to join successfully. */
|
|
continue;
|
|
}
|
|
|
|
/* Update the sample rate to match the bridge's native sample rate if necessary. */
|
|
if (update_all_rates) {
|
|
set_softmix_bridge_data(softmix_data->internal_rate,
|
|
softmix_data->internal_mixing_interval, bridge_channel, 1, -1, -1, -1);
|
|
}
|
|
|
|
/* If stat_iteration_counter is 0, then collect statistics during this mixing interation */
|
|
if (!stat_iteration_counter) {
|
|
gather_softmix_stats(&stats, softmix_data, bridge_channel);
|
|
}
|
|
|
|
/* if the channel is suspended, don't check for audio, but still gather stats */
|
|
if (bridge_channel->suspended) {
|
|
continue;
|
|
}
|
|
|
|
/* Try to get audio from the factory if available */
|
|
ast_mutex_lock(&sc->lock);
|
|
if ((mixing_array.buffers[mixing_array.used_entries] = softmix_process_read_audio(sc, softmix_samples))) {
|
|
#ifdef BINAURAL_RENDERING
|
|
add_binaural_mixing(bridge, softmix_data, softmix_samples, &mixing_array, sc,
|
|
ast_channel_name(bridge_channel->chan));
|
|
#endif
|
|
mixing_array.used_entries++;
|
|
}
|
|
if (remb_update) {
|
|
remb_collect_report(bridge, bridge_channel, softmix_data, sc);
|
|
}
|
|
ast_mutex_unlock(&sc->lock);
|
|
}
|
|
|
|
/* mix it like crazy (non binaural channels)*/
|
|
memset(buf, 0, softmix_datalen);
|
|
for (idx = 0; idx < mixing_array.used_entries; ++idx) {
|
|
for (x = 0; x < softmix_samples; ++x) {
|
|
ast_slinear_saturated_add(buf + x, mixing_array.buffers[idx] + x);
|
|
}
|
|
}
|
|
|
|
#ifdef BINAURAL_RENDERING
|
|
binaural_mixing(bridge, softmix_data, &mixing_array, bin_buf, ann_buf);
|
|
#endif
|
|
|
|
/* Next step go through removing the channel's own audio and creating a good frame... */
|
|
AST_LIST_TRAVERSE(&bridge->channels, bridge_channel, entry) {
|
|
struct softmix_channel *sc = bridge_channel->tech_pvt;
|
|
|
|
if (!sc || bridge_channel->suspended) {
|
|
/* This channel failed to join successfully or is suspended. */
|
|
continue;
|
|
}
|
|
|
|
ast_mutex_lock(&sc->lock);
|
|
|
|
/* Make SLINEAR write frame from local buffer */
|
|
ao2_t_replace(sc->write_frame.subclass.format, cur_slin,
|
|
"Replace softmix channel slin format");
|
|
#ifdef BINAURAL_RENDERING
|
|
if (bridge->softmix.binaural_active && softmix_data->convolve.binaural_active
|
|
&& sc->binaural) {
|
|
create_binaural_frame(bridge_channel, sc, bin_buf, ann_buf, softmix_datalen,
|
|
softmix_samples, buf);
|
|
} else
|
|
#endif
|
|
{
|
|
sc->write_frame.datalen = softmix_datalen;
|
|
sc->write_frame.samples = softmix_samples;
|
|
memcpy(sc->final_buf, buf, softmix_datalen);
|
|
}
|
|
/* process the softmix channel's new write audio */
|
|
softmix_process_write_audio(&trans_helper,
|
|
ast_channel_rawwriteformat(bridge_channel->chan), sc,
|
|
softmix_data->default_sample_size);
|
|
|
|
ast_mutex_unlock(&sc->lock);
|
|
|
|
/* A frame is now ready for the channel. */
|
|
ast_bridge_channel_queue_frame(bridge_channel, &sc->write_frame);
|
|
|
|
if (remb_update) {
|
|
remb_send_report(bridge_channel, softmix_data, sc);
|
|
}
|
|
}
|
|
|
|
if (remb_update) {
|
|
/* In case we are doing bridge level REMB reset the bitrate so we start fresh */
|
|
softmix_data->bitrate = 0;
|
|
}
|
|
|
|
update_all_rates = 0;
|
|
if (!stat_iteration_counter) {
|
|
update_all_rates = analyse_softmix_stats(&stats, softmix_data,
|
|
bridge->softmix.binaural_active);
|
|
stat_iteration_counter = SOFTMIX_STAT_INTERVAL;
|
|
}
|
|
stat_iteration_counter--;
|
|
|
|
ast_bridge_unlock(bridge);
|
|
/* cleanup any translation frame data from the previous mixing iteration. */
|
|
softmix_translate_helper_cleanup(&trans_helper);
|
|
/* Wait for the timing source to tell us to wake up and get things done */
|
|
ast_waitfor_n_fd(&timingfd, 1, &timeout, NULL);
|
|
if (ast_timer_ack(timer, 1) < 0) {
|
|
ast_log(LOG_ERROR, "Bridge %s: Failed to acknowledge timer in softmix.\n",
|
|
bridge->uniqueid);
|
|
ast_bridge_lock(bridge);
|
|
goto softmix_cleanup;
|
|
}
|
|
ast_bridge_lock(bridge);
|
|
|
|
/* make sure to detect mixing interval changes if they occur. */
|
|
if (bridge->softmix.internal_mixing_interval
|
|
&& (bridge->softmix.internal_mixing_interval != softmix_data->internal_mixing_interval)) {
|
|
softmix_data->internal_mixing_interval = bridge->softmix.internal_mixing_interval;
|
|
ast_timer_set_rate(timer, (1000 / softmix_data->internal_mixing_interval));
|
|
update_all_rates = 1; /* if the interval changes, the rates must be adjusted as well just to be notified new interval.*/
|
|
}
|
|
}
|
|
|
|
res = 0;
|
|
|
|
softmix_cleanup:
|
|
softmix_translate_helper_destroy(&trans_helper);
|
|
softmix_mixing_array_destroy(&mixing_array, bridge->softmix.binaural_active);
|
|
return res;
|
|
}
|
|
|
|
/*!
|
|
* \internal
|
|
* \brief Mixing thread.
|
|
* \since 12.0.0
|
|
*
|
|
* \note The thread does not have its own reference to the
|
|
* bridge. The lifetime of the thread is tied to the lifetime
|
|
* of the mixing technology association with the bridge.
|
|
*/
|
|
static void *softmix_mixing_thread(void *data)
|
|
{
|
|
struct softmix_bridge_data *softmix_data = data;
|
|
struct ast_bridge *bridge = softmix_data->bridge;
|
|
|
|
ast_bridge_lock(bridge);
|
|
if (bridge->callid) {
|
|
ast_callid_threadassoc_add(bridge->callid);
|
|
}
|
|
|
|
ast_debug(1, "Bridge %s: starting mixing thread\n", bridge->uniqueid);
|
|
|
|
while (!softmix_data->stop) {
|
|
if (!bridge->num_active) {
|
|
/* Wait for something to happen to the bridge. */
|
|
ast_bridge_unlock(bridge);
|
|
ast_mutex_lock(&softmix_data->lock);
|
|
if (!softmix_data->stop) {
|
|
ast_cond_wait(&softmix_data->cond, &softmix_data->lock);
|
|
}
|
|
ast_mutex_unlock(&softmix_data->lock);
|
|
ast_bridge_lock(bridge);
|
|
continue;
|
|
}
|
|
|
|
if (bridge->softmix.binaural_active && !softmix_data->binaural_init) {
|
|
#ifndef BINAURAL_RENDERING
|
|
ast_bridge_lock(bridge);
|
|
bridge->softmix.binaural_active = 0;
|
|
ast_bridge_unlock(bridge);
|
|
ast_log(LOG_WARNING, "Bridge: %s: Binaural rendering active by config but not "
|
|
"compiled.\n", bridge->uniqueid);
|
|
#else
|
|
/* Set and init binaural data if binaural is activated in the configuration. */
|
|
softmix_data->internal_rate = SOFTMIX_BINAURAL_SAMPLE_RATE;
|
|
softmix_data->default_sample_size = SOFTMIX_SAMPLES(softmix_data->internal_rate,
|
|
softmix_data->internal_mixing_interval);
|
|
/* If init for binaural processing fails we will fall back to mono audio processing. */
|
|
if (init_convolve_data(&softmix_data->convolve, softmix_data->default_sample_size)
|
|
== -1) {
|
|
ast_bridge_lock(bridge);
|
|
bridge->softmix.binaural_active = 0;
|
|
ast_bridge_unlock(bridge);
|
|
ast_log(LOG_ERROR, "Bridge: %s: Unable to allocate memory for "
|
|
"binaural processing, Will only process mono audio.\n",
|
|
bridge->uniqueid);
|
|
}
|
|
softmix_data->binaural_init = 1;
|
|
#endif
|
|
}
|
|
|
|
if (softmix_mixing_loop(bridge)) {
|
|
/*
|
|
* A mixing error occurred. Sleep and try again later so we
|
|
* won't flood the logs.
|
|
*/
|
|
ast_bridge_unlock(bridge);
|
|
sleep(1);
|
|
ast_bridge_lock(bridge);
|
|
}
|
|
}
|
|
|
|
ast_bridge_unlock(bridge);
|
|
|
|
ast_debug(1, "Bridge %s: stopping mixing thread\n", bridge->uniqueid);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void softmix_bridge_data_destroy(struct softmix_bridge_data *softmix_data)
|
|
{
|
|
if (softmix_data->timer) {
|
|
ast_timer_close(softmix_data->timer);
|
|
softmix_data->timer = NULL;
|
|
}
|
|
ast_mutex_destroy(&softmix_data->lock);
|
|
ast_cond_destroy(&softmix_data->cond);
|
|
AST_VECTOR_RESET(&softmix_data->remb_collectors, ao2_cleanup);
|
|
AST_VECTOR_FREE(&softmix_data->remb_collectors);
|
|
ast_free(softmix_data);
|
|
}
|
|
|
|
/*! \brief Function called when a bridge is created */
|
|
static int softmix_bridge_create(struct ast_bridge *bridge)
|
|
{
|
|
struct softmix_bridge_data *softmix_data;
|
|
|
|
softmix_data = ast_calloc(1, sizeof(*softmix_data));
|
|
if (!softmix_data) {
|
|
return -1;
|
|
}
|
|
softmix_data->bridge = bridge;
|
|
ast_mutex_init(&softmix_data->lock);
|
|
ast_cond_init(&softmix_data->cond, NULL);
|
|
softmix_data->timer = ast_timer_open();
|
|
if (!softmix_data->timer) {
|
|
ast_log(AST_LOG_WARNING, "Failed to open timer for softmix bridge\n");
|
|
softmix_bridge_data_destroy(softmix_data);
|
|
return -1;
|
|
}
|
|
/* start at minimum rate, let it grow from there */
|
|
softmix_data->internal_rate = SOFTMIX_MIN_SAMPLE_RATE;
|
|
softmix_data->internal_mixing_interval = DEFAULT_SOFTMIX_INTERVAL;
|
|
|
|
#ifdef BINAURAL_RENDERING
|
|
softmix_data->default_sample_size = SOFTMIX_SAMPLES(softmix_data->internal_rate,
|
|
softmix_data->internal_mixing_interval);
|
|
#endif
|
|
|
|
AST_VECTOR_INIT(&softmix_data->remb_collectors, 0);
|
|
|
|
bridge->tech_pvt = softmix_data;
|
|
|
|
/* Start the mixing thread. */
|
|
if (ast_pthread_create(&softmix_data->thread, NULL, softmix_mixing_thread,
|
|
softmix_data)) {
|
|
softmix_data->thread = AST_PTHREADT_NULL;
|
|
softmix_bridge_data_destroy(softmix_data);
|
|
bridge->tech_pvt = NULL;
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*!
|
|
* \internal
|
|
* \brief Request the softmix mixing thread stop.
|
|
* \since 12.0.0
|
|
*
|
|
* \param bridge Which bridge is being stopped.
|
|
*
|
|
* \return Nothing
|
|
*/
|
|
static void softmix_bridge_stop(struct ast_bridge *bridge)
|
|
{
|
|
struct softmix_bridge_data *softmix_data;
|
|
|
|
softmix_data = bridge->tech_pvt;
|
|
if (!softmix_data) {
|
|
return;
|
|
}
|
|
|
|
ast_mutex_lock(&softmix_data->lock);
|
|
softmix_data->stop = 1;
|
|
ast_mutex_unlock(&softmix_data->lock);
|
|
}
|
|
|
|
/*! \brief Function called when a bridge is destroyed */
|
|
static void softmix_bridge_destroy(struct ast_bridge *bridge)
|
|
{
|
|
struct softmix_bridge_data *softmix_data;
|
|
pthread_t thread;
|
|
|
|
softmix_data = bridge->tech_pvt;
|
|
if (!softmix_data) {
|
|
return;
|
|
}
|
|
|
|
/* Stop the mixing thread. */
|
|
ast_mutex_lock(&softmix_data->lock);
|
|
softmix_data->stop = 1;
|
|
ast_cond_signal(&softmix_data->cond);
|
|
thread = softmix_data->thread;
|
|
softmix_data->thread = AST_PTHREADT_NULL;
|
|
ast_mutex_unlock(&softmix_data->lock);
|
|
if (thread != AST_PTHREADT_NULL) {
|
|
ast_debug(1, "Bridge %s: Waiting for mixing thread to die.\n", bridge->uniqueid);
|
|
pthread_join(thread, NULL);
|
|
}
|
|
#ifdef BINAURAL_RENDERING
|
|
free_convolve_data(&softmix_data->convolve);
|
|
#endif
|
|
softmix_bridge_data_destroy(softmix_data);
|
|
bridge->tech_pvt = NULL;
|
|
}
|
|
|
|
/*!
|
|
* \brief Map a source stream to all of its destination streams.
|
|
*
|
|
* \param source_channel_name Name of channel where the source stream originates
|
|
* \param bridge_stream_position The slot in the bridge where source video will come from
|
|
* \param participants The bridge_channels in the bridge
|
|
* \param source_channel_stream_position The position of the stream on the source channel
|
|
*/
|
|
static void map_source_to_destinations(const char *source_channel_name,
|
|
size_t bridge_stream_position, struct ast_bridge_channels_list *participants, int source_channel_stream_position)
|
|
{
|
|
struct ast_bridge_channel *participant;
|
|
|
|
AST_LIST_TRAVERSE(participants, participant, entry) {
|
|
int i;
|
|
struct ast_stream_topology *topology;
|
|
|
|
if (!strcmp(source_channel_name, ast_channel_name(participant->chan))) {
|
|
continue;
|
|
}
|
|
|
|
ast_bridge_channel_lock(participant);
|
|
ast_channel_lock(participant->chan);
|
|
topology = ast_channel_get_stream_topology(participant->chan);
|
|
|
|
for (i = 0; i < ast_stream_topology_get_count(topology); ++i) {
|
|
struct ast_stream *stream;
|
|
|
|
stream = ast_stream_topology_get_stream(topology, i);
|
|
if (is_video_dest(stream, source_channel_name, source_channel_stream_position)) {
|
|
struct softmix_channel *sc = participant->tech_pvt;
|
|
|
|
AST_VECTOR_REPLACE(&participant->stream_map.to_channel, bridge_stream_position, i);
|
|
AST_VECTOR_APPEND(&sc->video_sources, bridge_stream_position);
|
|
break;
|
|
}
|
|
}
|
|
ast_channel_unlock(participant->chan);
|
|
ast_bridge_channel_unlock(participant);
|
|
}
|
|
}
|
|
|
|
/*!
|
|
* \brief Allocate a REMB collector
|
|
*
|
|
* \retval non-NULL success
|
|
* \retval NULL failure
|
|
*/
|
|
static struct softmix_remb_collector *remb_collector_alloc(void)
|
|
{
|
|
struct softmix_remb_collector *collector;
|
|
|
|
collector = ao2_alloc_options(sizeof(*collector), NULL, AO2_ALLOC_OPT_LOCK_NOLOCK);
|
|
if (!collector) {
|
|
return NULL;
|
|
}
|
|
|
|
collector->frame.frametype = AST_FRAME_RTCP;
|
|
collector->frame.subclass.integer = AST_RTP_RTCP_PSFB;
|
|
collector->feedback.fmt = AST_RTP_RTCP_FMT_REMB;
|
|
collector->frame.data.ptr = &collector->feedback;
|
|
collector->frame.datalen = sizeof(collector->feedback);
|
|
|
|
return collector;
|
|
}
|
|
|
|
/*!
|
|
* \brief Setup REMB collection for a particular bridge stream and channel.
|
|
*
|
|
* \param bridge The bridge
|
|
* \param bridge_channel Channel that is collecting REMB information
|
|
* \param bridge_stream_position The slot in the bridge where source video comes from
|
|
*/
|
|
static void remb_enable_collection(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel,
|
|
size_t bridge_stream_position)
|
|
{
|
|
struct softmix_channel *sc = bridge_channel->tech_pvt;
|
|
struct softmix_bridge_data *softmix_data = bridge->tech_pvt;
|
|
|
|
if (!sc->remb_collector) {
|
|
sc->remb_collector = remb_collector_alloc();
|
|
if (!sc->remb_collector) {
|
|
/* This is not fatal. Things will still continue to work but we won't
|
|
* produce a REMB report to the sender.
|
|
*/
|
|
return;
|
|
}
|
|
}
|
|
|
|
ao2_ref(sc->remb_collector, +1);
|
|
if (AST_VECTOR_REPLACE(&softmix_data->remb_collectors, bridge_stream_position,
|
|
sc->remb_collector)) {
|
|
ao2_ref(sc->remb_collector, -1);
|
|
}
|
|
}
|
|
|
|
static void softmix_bridge_stream_sources_update(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel,
|
|
struct softmix_channel *sc)
|
|
{
|
|
int index;
|
|
struct ast_stream_topology *old_topology = sc->topology;
|
|
struct ast_stream_topology *new_topology = ast_channel_get_stream_topology(bridge_channel->chan);
|
|
int removed_streams[MAX(ast_stream_topology_get_count(sc->topology), ast_stream_topology_get_count(new_topology))];
|
|
size_t removed_streams_count = 0;
|
|
struct ast_stream_topology *added_streams;
|
|
struct ast_bridge_channels_list *participants = &bridge->channels;
|
|
struct ast_bridge_channel *participant;
|
|
|
|
added_streams = ast_stream_topology_alloc();
|
|
if (!added_streams) {
|
|
return;
|
|
}
|
|
|
|
/* We go through the old topology comparing it to the new topology to determine what streams
|
|
* changed state. A state transition can result in the stream being considered a new source
|
|
* (for example it was removed and is now present) or being removed (a stream became inactive).
|
|
* Added streams are copied into a topology and added to each other participant while for
|
|
* removed streams we merely store their position and mark them as removed later.
|
|
*/
|
|
for (index = 0; index < ast_stream_topology_get_count(sc->topology) && index < ast_stream_topology_get_count(new_topology); ++index) {
|
|
struct ast_stream *old_stream = ast_stream_topology_get_stream(sc->topology, index);
|
|
struct ast_stream *new_stream = ast_stream_topology_get_stream(new_topology, index);
|
|
|
|
/* Ignore all streams that don't carry video and streams that are strictly outgoing destination streams */
|
|
if ((ast_stream_get_type(old_stream) != AST_MEDIA_TYPE_VIDEO && ast_stream_get_type(new_stream) != AST_MEDIA_TYPE_VIDEO) ||
|
|
!strncmp(ast_stream_get_name(old_stream), SOFTBRIDGE_VIDEO_DEST_PREFIX,
|
|
SOFTBRIDGE_VIDEO_DEST_LEN)) {
|
|
continue;
|
|
}
|
|
|
|
if (ast_stream_get_type(old_stream) == AST_MEDIA_TYPE_VIDEO && ast_stream_get_type(new_stream) != AST_MEDIA_TYPE_VIDEO) {
|
|
/* If a stream renegotiates from video to non-video then we need to remove it as a source */
|
|
removed_streams[removed_streams_count++] = index;
|
|
} else if (ast_stream_get_type(old_stream) != AST_MEDIA_TYPE_VIDEO && ast_stream_get_type(new_stream) == AST_MEDIA_TYPE_VIDEO) {
|
|
if (ast_stream_get_state(new_stream) != AST_STREAM_STATE_REMOVED) {
|
|
/* If a stream renegotiates from non-video to video in a non-removed state we need to add it as a source */
|
|
if (append_source_stream(added_streams, ast_channel_name(bridge_channel->chan),
|
|
bridge->softmix.send_sdp_label ? ast_channel_uniqueid(bridge_channel->chan) : NULL,
|
|
new_stream, index)) {
|
|
goto cleanup;
|
|
}
|
|
}
|
|
} else if (ast_stream_get_state(old_stream) != AST_STREAM_STATE_REMOVED &&
|
|
ast_stream_get_state(new_stream) != AST_STREAM_STATE_SENDRECV && ast_stream_get_state(new_stream) != AST_STREAM_STATE_RECVONLY) {
|
|
/* If a stream renegotiates and is removed then we remove it */
|
|
removed_streams[removed_streams_count++] = index;
|
|
} else if (ast_stream_get_state(old_stream) == AST_STREAM_STATE_REMOVED &&
|
|
ast_stream_get_state(new_stream) != AST_STREAM_STATE_INACTIVE && ast_stream_get_state(new_stream) != AST_STREAM_STATE_SENDONLY &&
|
|
ast_stream_get_state(new_stream) != AST_STREAM_STATE_REMOVED) {
|
|
/* If a stream renegotiates and is added then we add it */
|
|
if (append_source_stream(added_streams, ast_channel_name(bridge_channel->chan),
|
|
bridge->softmix.send_sdp_label ? ast_channel_uniqueid(bridge_channel->chan) : NULL,
|
|
new_stream, index)) {
|
|
goto cleanup;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Any newly added streams that did not take the position of a removed stream
|
|
* will be present at the end of the new topology. Since streams are never
|
|
* removed from the topology but merely marked as removed we can pick up where we
|
|
* left off when comparing the old and new topologies.
|
|
*/
|
|
for (; index < ast_stream_topology_get_count(new_topology); ++index) {
|
|
struct ast_stream *stream = ast_stream_topology_get_stream(new_topology, index);
|
|
|
|
if (!is_video_source(stream)) {
|
|
continue;
|
|
}
|
|
|
|
if (append_source_stream(added_streams, ast_channel_name(bridge_channel->chan),
|
|
bridge->softmix.send_sdp_label ? ast_channel_uniqueid(bridge_channel->chan) : NULL,
|
|
stream, index)) {
|
|
goto cleanup;
|
|
}
|
|
}
|
|
|
|
/* We always update the stored topology if we can to reflect what is currently negotiated */
|
|
sc->topology = ast_stream_topology_clone(new_topology);
|
|
if (!sc->topology) {
|
|
sc->topology = old_topology;
|
|
} else {
|
|
ast_stream_topology_free(old_topology);
|
|
}
|
|
|
|
/* If there are no removed sources and no added sources we don't need to renegotiate the
|
|
* other participants.
|
|
*/
|
|
if (!removed_streams_count && !ast_stream_topology_get_count(added_streams)) {
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Go through each participant adding in the new streams and removing the old ones */
|
|
AST_LIST_TRAVERSE(participants, participant, entry) {
|
|
if (participant == bridge_channel) {
|
|
continue;
|
|
}
|
|
|
|
sc = participant->tech_pvt;
|
|
|
|
/* We add in all the new streams first so that they do not take the place
|
|
* of any of our removed streams, allowing the remote side to reset the state
|
|
* for each removed stream. */
|
|
if (append_all_streams(sc->topology, added_streams)) {
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Then we go through and remove any ones that were removed */
|
|
for (index = 0; removed_streams_count && index < ast_stream_topology_get_count(sc->topology); ++index) {
|
|
struct ast_stream *stream = ast_stream_topology_get_stream(sc->topology, index);
|
|
int removed_stream;
|
|
|
|
for (removed_stream = 0; removed_stream < removed_streams_count; ++removed_stream) {
|
|
if (is_video_dest(stream, ast_channel_name(bridge_channel->chan), removed_streams[removed_stream])) {
|
|
ast_stream_set_state(stream, AST_STREAM_STATE_REMOVED);
|
|
}
|
|
}
|
|
}
|
|
|
|
ast_channel_request_stream_topology_change(participant->chan, sc->topology, NULL);
|
|
}
|
|
|
|
|
|
cleanup:
|
|
ast_stream_topology_free(added_streams);
|
|
}
|
|
|
|
/*!
|
|
* \brief stream_topology_changed callback
|
|
*
|
|
* For most video modes, nothing beyond the ordinary is required.
|
|
* For the SFU case, though, we need to completely remap the streams
|
|
* in order to ensure video gets directed where it is expected to go.
|
|
*
|
|
* \param bridge The bridge
|
|
* \param bridge_channel Channel whose topology has changed
|
|
*/
|
|
static void softmix_bridge_stream_topology_changed(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
|
|
{
|
|
struct softmix_bridge_data *softmix_data = bridge->tech_pvt;
|
|
struct softmix_channel *sc = bridge_channel->tech_pvt;
|
|
struct ast_bridge_channel *participant;
|
|
struct ast_vector_int media_types;
|
|
int nths[AST_MEDIA_TYPE_END] = {0};
|
|
int idx;
|
|
|
|
switch (bridge->softmix.video_mode.mode) {
|
|
case AST_BRIDGE_VIDEO_MODE_NONE:
|
|
case AST_BRIDGE_VIDEO_MODE_SINGLE_SRC:
|
|
case AST_BRIDGE_VIDEO_MODE_TALKER_SRC:
|
|
default:
|
|
ast_bridge_channel_stream_map(bridge_channel);
|
|
return;
|
|
case AST_BRIDGE_VIDEO_MODE_SFU:
|
|
break;
|
|
}
|
|
|
|
ast_channel_lock(bridge_channel->chan);
|
|
softmix_bridge_stream_sources_update(bridge, bridge_channel, sc);
|
|
ast_channel_unlock(bridge_channel->chan);
|
|
|
|
AST_VECTOR_INIT(&media_types, AST_MEDIA_TYPE_END);
|
|
|
|
/* The bridge stream identifiers may change, so reset the mapping for them.
|
|
* When channels end up getting added back in they'll reuse their existing
|
|
* collector and won't need to allocate a new one (unless they were just added).
|
|
*/
|
|
for (idx = 0; idx < AST_VECTOR_SIZE(&softmix_data->remb_collectors); ++idx) {
|
|
ao2_cleanup(AST_VECTOR_GET(&softmix_data->remb_collectors, idx));
|
|
AST_VECTOR_REPLACE(&softmix_data->remb_collectors, idx, NULL);
|
|
}
|
|
|
|
/* First traversal: re-initialize all of the participants' stream maps */
|
|
AST_LIST_TRAVERSE(&bridge->channels, participant, entry) {
|
|
ast_bridge_channel_lock(participant);
|
|
|
|
AST_VECTOR_RESET(&participant->stream_map.to_channel, AST_VECTOR_ELEM_CLEANUP_NOOP);
|
|
AST_VECTOR_RESET(&participant->stream_map.to_bridge, AST_VECTOR_ELEM_CLEANUP_NOOP);
|
|
|
|
sc = participant->tech_pvt;
|
|
AST_VECTOR_RESET(&sc->video_sources, AST_VECTOR_ELEM_CLEANUP_NOOP);
|
|
|
|
ast_bridge_channel_unlock(participant);
|
|
}
|
|
|
|
/* Second traversal: Map specific video channels from their source to their destinations.
|
|
*
|
|
* This is similar to what is done in ast_stream_topology_map(),
|
|
* except that video channels are handled differently. Each video
|
|
* source has it's own unique index on the bridge. This way, a
|
|
* particular channel's source video can be distributed to the
|
|
* appropriate destination streams on the other channels.
|
|
*/
|
|
AST_LIST_TRAVERSE(&bridge->channels, participant, entry) {
|
|
int i;
|
|
struct ast_stream_topology *topology;
|
|
|
|
ast_bridge_channel_lock(participant);
|
|
ast_channel_lock(participant->chan);
|
|
|
|
topology = ao2_bump(ast_channel_get_stream_topology(participant->chan));
|
|
if (!topology) {
|
|
/* Oh, my, we are in trouble. */
|
|
ast_channel_unlock(participant->chan);
|
|
ast_bridge_channel_unlock(participant);
|
|
continue;
|
|
}
|
|
|
|
for (i = 0; i < ast_stream_topology_get_count(topology); ++i) {
|
|
struct ast_stream *stream = ast_stream_topology_get_stream(topology, i);
|
|
|
|
if (is_video_source(stream)) {
|
|
AST_VECTOR_APPEND(&media_types, AST_MEDIA_TYPE_VIDEO);
|
|
AST_VECTOR_REPLACE(&participant->stream_map.to_bridge, i, AST_VECTOR_SIZE(&media_types) - 1);
|
|
/*
|
|
* There are cases where we need to bidirectionally send frames, such as for REMB reports
|
|
* so we also map back to the channel.
|
|
*/
|
|
AST_VECTOR_REPLACE(&participant->stream_map.to_channel, AST_VECTOR_SIZE(&media_types) - 1, i);
|
|
remb_enable_collection(bridge, participant, AST_VECTOR_SIZE(&media_types) - 1);
|
|
/*
|
|
* Unlock the channel and participant to prevent
|
|
* potential deadlock in map_source_to_destinations().
|
|
*/
|
|
ast_channel_unlock(participant->chan);
|
|
ast_bridge_channel_unlock(participant);
|
|
|
|
map_source_to_destinations(ast_channel_name(participant->chan),
|
|
AST_VECTOR_SIZE(&media_types) - 1, &bridge->channels, i);
|
|
ast_bridge_channel_lock(participant);
|
|
ast_channel_lock(participant->chan);
|
|
} else if (ast_stream_get_type(stream) == AST_MEDIA_TYPE_VIDEO) {
|
|
/* Video stream mapping occurs directly when a video source stream
|
|
* is found on a channel. Video streams should otherwise remain
|
|
* unmapped.
|
|
*/
|
|
AST_VECTOR_REPLACE(&participant->stream_map.to_bridge, i, -1);
|
|
} else if (ast_stream_get_state(stream) != AST_STREAM_STATE_REMOVED) {
|
|
/* XXX This is copied from ast_stream_topology_map(). This likely could
|
|
* be factored out in some way
|
|
*/
|
|
enum ast_media_type type = ast_stream_get_type(stream);
|
|
int index = AST_VECTOR_GET_INDEX_NTH(&media_types, ++nths[type],
|
|
type, AST_VECTOR_ELEM_DEFAULT_CMP);
|
|
|
|
if (index == -1) {
|
|
AST_VECTOR_APPEND(&media_types, type);
|
|
index = AST_VECTOR_SIZE(&media_types) - 1;
|
|
}
|
|
|
|
AST_VECTOR_REPLACE(&participant->stream_map.to_bridge, i, index);
|
|
AST_VECTOR_REPLACE(&participant->stream_map.to_channel, index, i);
|
|
}
|
|
}
|
|
|
|
ast_stream_topology_free(topology);
|
|
|
|
ast_channel_unlock(participant->chan);
|
|
ast_bridge_channel_unlock(participant);
|
|
}
|
|
|
|
AST_VECTOR_FREE(&media_types);
|
|
}
|
|
|
|
static struct ast_bridge_technology softmix_bridge = {
|
|
.name = "softmix",
|
|
.capabilities = AST_BRIDGE_CAPABILITY_MULTIMIX,
|
|
.preference = AST_BRIDGE_PREFERENCE_BASE_MULTIMIX,
|
|
.create = softmix_bridge_create,
|
|
.stop = softmix_bridge_stop,
|
|
.destroy = softmix_bridge_destroy,
|
|
.join = softmix_bridge_join,
|
|
.leave = softmix_bridge_leave,
|
|
.unsuspend = softmix_bridge_unsuspend,
|
|
.write = softmix_bridge_write,
|
|
.stream_topology_changed = softmix_bridge_stream_topology_changed,
|
|
};
|
|
|
|
#ifdef TEST_FRAMEWORK
|
|
struct stream_parameters {
|
|
const char *name;
|
|
const char *formats;
|
|
enum ast_media_type type;
|
|
};
|
|
|
|
static struct ast_stream_topology *build_topology(const struct stream_parameters *params, size_t num_streams)
|
|
{
|
|
struct ast_stream_topology *topology;
|
|
size_t i;
|
|
|
|
topology = ast_stream_topology_alloc();
|
|
if (!topology) {
|
|
return NULL;
|
|
}
|
|
|
|
for (i = 0; i < num_streams; ++i) {
|
|
RAII_VAR(struct ast_format_cap *, caps, NULL, ao2_cleanup);
|
|
struct ast_stream *stream;
|
|
|
|
caps = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
|
|
if (!caps) {
|
|
goto fail;
|
|
}
|
|
if (ast_format_cap_update_by_allow_disallow(caps, params[i].formats, 1) < 0) {
|
|
goto fail;
|
|
}
|
|
stream = ast_stream_alloc(params[i].name, params[i].type);
|
|
if (!stream) {
|
|
goto fail;
|
|
}
|
|
ast_stream_set_formats(stream, caps);
|
|
if (ast_stream_topology_append_stream(topology, stream) < 0) {
|
|
ast_stream_free(stream);
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
return topology;
|
|
|
|
fail:
|
|
ast_stream_topology_free(topology);
|
|
return NULL;
|
|
}
|
|
|
|
static int validate_stream(struct ast_test *test, struct ast_stream *stream,
|
|
const struct stream_parameters *params)
|
|
{
|
|
struct ast_format_cap *stream_caps;
|
|
struct ast_format_cap *params_caps;
|
|
|
|
if (ast_stream_get_type(stream) != params->type) {
|
|
ast_test_status_update(test, "Expected stream type '%s' but got type '%s'\n",
|
|
ast_codec_media_type2str(params->type),
|
|
ast_codec_media_type2str(ast_stream_get_type(stream)));
|
|
return -1;
|
|
}
|
|
if (strcmp(ast_stream_get_name(stream), params->name)) {
|
|
ast_test_status_update(test, "Expected stream name '%s' but got type '%s'\n",
|
|
params->name, ast_stream_get_name(stream));
|
|
return -1;
|
|
}
|
|
|
|
stream_caps = ast_stream_get_formats(stream);
|
|
params_caps = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
|
|
if (!params_caps) {
|
|
ast_test_status_update(test, "Allocation error on capabilities\n");
|
|
return -1;
|
|
}
|
|
ast_format_cap_update_by_allow_disallow(params_caps, params->formats, 1);
|
|
|
|
if (!ast_format_cap_identical(stream_caps, params_caps)) {
|
|
ast_test_status_update(test, "Formats are not as expected on stream '%s'\n",
|
|
ast_stream_get_name(stream));
|
|
ao2_cleanup(params_caps);
|
|
return -1;
|
|
}
|
|
|
|
ao2_cleanup(params_caps);
|
|
return 0;
|
|
}
|
|
|
|
static int validate_original_streams(struct ast_test *test, struct ast_stream_topology *topology,
|
|
const struct stream_parameters *params, size_t num_streams)
|
|
{
|
|
int i;
|
|
|
|
if (ast_stream_topology_get_count(topology) < num_streams) {
|
|
ast_test_status_update(test, "Topology only has %d streams. Needs to have at least %zu\n",
|
|
ast_stream_topology_get_count(topology), num_streams);
|
|
return -1;
|
|
}
|
|
|
|
for (i = 0; i < num_streams; ++i) {
|
|
if (validate_stream(test, ast_stream_topology_get_stream(topology, i), ¶ms[i])) {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
AST_TEST_DEFINE(sfu_append_source_streams)
|
|
{
|
|
enum ast_test_result_state res = AST_TEST_FAIL;
|
|
static const struct stream_parameters bob_streams[] = {
|
|
{ "bob_audio", "ulaw,alaw,g722,opus", AST_MEDIA_TYPE_AUDIO, },
|
|
{ "bob_video", "h264,vp8", AST_MEDIA_TYPE_VIDEO, },
|
|
};
|
|
static const struct stream_parameters alice_streams[] = {
|
|
{ "alice_audio", "ulaw,opus", AST_MEDIA_TYPE_AUDIO, },
|
|
{ "alice_video", "vp8", AST_MEDIA_TYPE_VIDEO, },
|
|
};
|
|
static const struct stream_parameters alice_dest_stream = {
|
|
"softbridge_dest_PJSIP/Bob-00000001_1", "h264,vp8", AST_MEDIA_TYPE_VIDEO,
|
|
};
|
|
static const struct stream_parameters bob_dest_stream = {
|
|
"softbridge_dest_PJSIP/Alice-00000000_1", "vp8", AST_MEDIA_TYPE_VIDEO,
|
|
};
|
|
struct ast_stream_topology *topology_alice = NULL;
|
|
struct ast_stream_topology *topology_bob = NULL;
|
|
|
|
switch (cmd) {
|
|
case TEST_INIT:
|
|
info->name = "sfu_append_source_streams";
|
|
info->category = "/bridges/bridge_softmix/";
|
|
info->summary = "Test appending of video streams";
|
|
info->description =
|
|
"This tests does stuff.";
|
|
return AST_TEST_NOT_RUN;
|
|
case TEST_EXECUTE:
|
|
break;
|
|
}
|
|
|
|
topology_alice = build_topology(alice_streams, ARRAY_LEN(alice_streams));
|
|
if (!topology_alice) {
|
|
goto end;
|
|
}
|
|
|
|
topology_bob = build_topology(bob_streams, ARRAY_LEN(bob_streams));
|
|
if (!topology_bob) {
|
|
goto end;
|
|
}
|
|
|
|
if (append_source_streams(topology_alice, "PJSIP/Bob-00000001", NULL, topology_bob)) {
|
|
ast_test_status_update(test, "Failed to append Bob's streams to Alice\n");
|
|
goto end;
|
|
}
|
|
|
|
if (ast_stream_topology_get_count(topology_alice) != 3) {
|
|
ast_test_status_update(test, "Alice's topology isn't large enough! It's %d but needs to be %d\n",
|
|
ast_stream_topology_get_count(topology_alice), 3);
|
|
goto end;
|
|
}
|
|
|
|
if (validate_original_streams(test, topology_alice, alice_streams, ARRAY_LEN(alice_streams))) {
|
|
goto end;
|
|
}
|
|
|
|
if (validate_stream(test, ast_stream_topology_get_stream(topology_alice, 2), &alice_dest_stream)) {
|
|
goto end;
|
|
}
|
|
|
|
if (append_source_streams(topology_bob, "PJSIP/Alice-00000000", NULL, topology_alice)) {
|
|
ast_test_status_update(test, "Failed to append Alice's streams to Bob\n");
|
|
goto end;
|
|
}
|
|
|
|
if (ast_stream_topology_get_count(topology_bob) != 3) {
|
|
ast_test_status_update(test, "Bob's topology isn't large enough! It's %d but needs to be %d\n",
|
|
ast_stream_topology_get_count(topology_bob), 3);
|
|
goto end;
|
|
}
|
|
|
|
if (validate_original_streams(test, topology_bob, bob_streams, ARRAY_LEN(bob_streams))) {
|
|
goto end;
|
|
}
|
|
|
|
if (validate_stream(test, ast_stream_topology_get_stream(topology_bob, 2), &bob_dest_stream)) {
|
|
goto end;
|
|
}
|
|
|
|
res = AST_TEST_PASS;
|
|
|
|
end:
|
|
ast_stream_topology_free(topology_alice);
|
|
ast_stream_topology_free(topology_bob);
|
|
return res;
|
|
}
|
|
|
|
AST_TEST_DEFINE(sfu_remove_destination_streams)
|
|
{
|
|
enum ast_test_result_state res = AST_TEST_FAIL;
|
|
static const struct stream_parameters params[] = {
|
|
{ "alice_audio", "ulaw,alaw,g722,opus", AST_MEDIA_TYPE_AUDIO, },
|
|
{ "alice_video", "h264,vp8", AST_MEDIA_TYPE_VIDEO, },
|
|
{ "softbridge_dest_PJSIP/Bob-00000001_video", "vp8", AST_MEDIA_TYPE_VIDEO, },
|
|
{ "softbridge_dest_PJSIP/Carol-00000002_video", "h264", AST_MEDIA_TYPE_VIDEO, },
|
|
};
|
|
static const struct {
|
|
const char *channel_name;
|
|
int num_streams;
|
|
int params_index[4];
|
|
} removal_results[] = {
|
|
{ "PJSIP/Bob-00000001", 4, { 0, 1, 2, 3 }, },
|
|
{ "PJSIP/Edward-00000004", 4, { 0, 1, 2, 3 }, },
|
|
{ "", 4, { 0, 1, 2, 3 }, },
|
|
};
|
|
struct ast_stream_topology *orig = NULL;
|
|
int i;
|
|
|
|
switch (cmd) {
|
|
case TEST_INIT:
|
|
info->name = "sfu_remove_destination_streams";
|
|
info->category = "/bridges/bridge_softmix/";
|
|
info->summary = "Test removal of destination video streams";
|
|
info->description =
|
|
"This tests does stuff.";
|
|
return AST_TEST_NOT_RUN;
|
|
case TEST_EXECUTE:
|
|
break;
|
|
}
|
|
|
|
orig = build_topology(params, ARRAY_LEN(params));
|
|
if (!orig) {
|
|
ast_test_status_update(test, "Unable to build initial stream topology\n");
|
|
goto end;
|
|
}
|
|
|
|
for (i = 0; i < ARRAY_LEN(removal_results); ++i) {
|
|
int j;
|
|
|
|
remove_destination_streams(orig, removal_results[i].channel_name);
|
|
|
|
if (ast_stream_topology_get_count(orig) != removal_results[i].num_streams) {
|
|
ast_test_status_update(test, "Resulting topology has %d streams, when %d are expected\n",
|
|
ast_stream_topology_get_count(orig), removal_results[i].num_streams);
|
|
goto end;
|
|
}
|
|
|
|
for (j = 0; j < removal_results[i].num_streams; ++j) {
|
|
struct ast_stream *actual;
|
|
struct ast_stream *expected;
|
|
int orig_index;
|
|
|
|
actual = ast_stream_topology_get_stream(orig, j);
|
|
|
|
orig_index = removal_results[i].params_index[j];
|
|
expected = ast_stream_topology_get_stream(orig, orig_index);
|
|
|
|
if (!ast_format_cap_identical(ast_stream_get_formats(actual),
|
|
ast_stream_get_formats(expected))) {
|
|
struct ast_str *expected_str;
|
|
struct ast_str *actual_str;
|
|
|
|
expected_str = ast_str_alloca(64);
|
|
actual_str = ast_str_alloca(64);
|
|
|
|
ast_test_status_update(test, "Mismatch between expected (%s) and actual (%s) stream formats\n",
|
|
ast_format_cap_get_names(ast_stream_get_formats(expected), &expected_str),
|
|
ast_format_cap_get_names(ast_stream_get_formats(actual), &actual_str));
|
|
goto end;
|
|
}
|
|
|
|
if (is_video_dest(actual, removal_results[i].channel_name, -1) &&
|
|
ast_stream_get_state(actual) != AST_STREAM_STATE_REMOVED) {
|
|
ast_test_status_update(test, "Removed stream %s does not have a state of removed\n", ast_stream_get_name(actual));
|
|
goto end;
|
|
}
|
|
}
|
|
}
|
|
|
|
res = AST_TEST_PASS;
|
|
|
|
end:
|
|
ast_stream_topology_free(orig);
|
|
return res;
|
|
}
|
|
|
|
#endif
|
|
|
|
static int unload_module(void)
|
|
{
|
|
ast_bridge_technology_unregister(&softmix_bridge);
|
|
AST_TEST_UNREGISTER(sfu_append_source_streams);
|
|
AST_TEST_UNREGISTER(sfu_remove_destination_streams);
|
|
return 0;
|
|
}
|
|
|
|
static int load_module(void)
|
|
{
|
|
if (ast_bridge_technology_register(&softmix_bridge)) {
|
|
unload_module();
|
|
return AST_MODULE_LOAD_DECLINE;
|
|
}
|
|
AST_TEST_REGISTER(sfu_append_source_streams);
|
|
AST_TEST_REGISTER(sfu_remove_destination_streams);
|
|
return AST_MODULE_LOAD_SUCCESS;
|
|
}
|
|
|
|
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Multi-party software based channel mixing");
|