see RFC 4855: parameter names are case-insensitive both in media type strings and in the default mapping to the SDP a=fmtp attribute. This change is required for H.263+ because some implementations are known to use even mixed-case. This does not fix ASTERISK~29268 because H.264 was not fixed. This approach here lowers/uppers both parameter names and parameter values. H.264 needs a different approach because one of its parameter values is not case-insensitive: sprop-parameter-sets is Base64. Change-Id: Idf2a73457be231647aed3c87b1da197afba86892
418 lines
12 KiB
C
418 lines
12 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2013, Digium, Inc.
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*
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* Lorenzo Miniero <lorenzo@meetecho.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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/*!
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* \file
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* \brief Opus format attribute interface
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*
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* \author Lorenzo Miniero <lorenzo@meetecho.com>
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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 <ctype.h>
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#include "asterisk/module.h"
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#include "asterisk/format.h"
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#include "asterisk/astobj2.h"
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#include "asterisk/logger.h"
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#include "asterisk/strings.h"
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#include "asterisk/utils.h"
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#include "asterisk/opus.h"
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/*!
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* \brief Opus attribute structure.
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*
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* \note http://tools.ietf.org/html/rfc7587#section-6
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*/
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struct opus_attr {
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int maxbitrate;
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int maxplayrate;
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int ptime;
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int stereo;
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int cbr;
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int fec;
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int dtx;
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int spropmaxcapturerate;
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int spropstereo;
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int maxptime;
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/* Note data is expected to be an ao2_object type */
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void *data;
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};
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static struct opus_attr default_opus_attr = {
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.maxbitrate = CODEC_OPUS_DEFAULT_BITRATE,
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.maxplayrate = CODEC_OPUS_DEFAULT_SAMPLE_RATE,
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.ptime = CODEC_OPUS_DEFAULT_PTIME,
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.stereo = CODEC_OPUS_DEFAULT_STEREO,
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.cbr = CODEC_OPUS_DEFAULT_CBR,
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.fec = CODEC_OPUS_DEFAULT_FEC,
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.dtx = CODEC_OPUS_DEFAULT_DTX,
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.spropmaxcapturerate = CODEC_OPUS_DEFAULT_SAMPLE_RATE,
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.spropstereo = CODEC_OPUS_DEFAULT_STEREO,
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.maxptime = CODEC_OPUS_DEFAULT_MAX_PTIME
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};
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static void opus_destroy(struct ast_format *format)
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{
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struct opus_attr *attr = ast_format_get_attribute_data(format);
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if (!attr) {
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return;
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}
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ao2_cleanup(attr->data);
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ast_free(attr);
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}
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static int opus_clone(const struct ast_format *src, struct ast_format *dst)
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{
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struct opus_attr *original = ast_format_get_attribute_data(src);
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struct opus_attr *attr = ast_malloc(sizeof(*attr));
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if (!attr) {
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return -1;
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}
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*attr = original ? *original : default_opus_attr;
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ao2_bump(attr->data);
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ast_format_set_attribute_data(dst, attr);
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ast_format_set_channel_count(dst, ast_format_get_channel_count(src));
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return 0;
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}
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static void sdp_fmtp_get(const char *attributes, const char *name, int *attr)
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{
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const char *kvp = attributes;
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int val;
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if (ast_strlen_zero(attributes)) {
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return;
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}
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/* This logic goes through each attribute in the fmtp line looking for the
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* requested named attribute.
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*/
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while (*kvp) {
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/* Skip any preceeding blanks as some implementations separate attributes using spaces too */
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kvp = ast_skip_blanks(kvp);
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/* If we are at the requested attribute get its value and return */
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if (!strncmp(kvp, name, strlen(name)) && kvp[strlen(name)] == '=') {
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if (sscanf(kvp, "%*[^=]=%30d", &val) == 1) {
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*attr = val;
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break;
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}
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}
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/* Move on to the next attribute if possible */
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kvp = strchr(kvp, ';');
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if (!kvp) {
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break;
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}
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kvp++;
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}
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}
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static struct ast_format *opus_parse_sdp_fmtp(const struct ast_format *format, const char *attributes)
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{
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char *attribs = ast_strdupa(attributes), *attrib;
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struct ast_format *cloned;
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struct opus_attr *attr;
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cloned = ast_format_clone(format);
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if (!cloned) {
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return NULL;
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}
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attr = ast_format_get_attribute_data(cloned);
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/* lower-case everything, so we are case-insensitive */
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for (attrib = attribs; *attrib; ++attrib) {
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*attrib = tolower(*attrib);
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} /* based on channels/chan_sip.c:process_a_sdp_image() */
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sdp_fmtp_get(attribs, CODEC_OPUS_ATTR_MAX_PLAYBACK_RATE, &attr->maxplayrate);
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sdp_fmtp_get(attribs, CODEC_OPUS_ATTR_MAX_CODED_AUDIO_BANDWIDTH,
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&attr->maxplayrate);
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sdp_fmtp_get(attribs, CODEC_OPUS_ATTR_SPROP_MAX_CAPTURE_RATE,
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&attr->spropmaxcapturerate);
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sdp_fmtp_get(attribs, CODEC_OPUS_ATTR_MAX_PTIME, &attr->maxptime);
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sdp_fmtp_get(attribs, CODEC_OPUS_ATTR_PTIME, &attr->ptime);
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sdp_fmtp_get(attribs, CODEC_OPUS_ATTR_MAX_AVERAGE_BITRATE, &attr->maxbitrate);
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sdp_fmtp_get(attribs, CODEC_OPUS_ATTR_STEREO, &attr->stereo);
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if (attr->stereo) {
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ast_format_set_channel_count(cloned, 2);
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}
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sdp_fmtp_get(attribs, CODEC_OPUS_ATTR_SPROP_STEREO, &attr->spropstereo);
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sdp_fmtp_get(attribs, CODEC_OPUS_ATTR_CBR, &attr->cbr);
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sdp_fmtp_get(attribs, CODEC_OPUS_ATTR_FEC, &attr->fec);
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sdp_fmtp_get(attribs, CODEC_OPUS_ATTR_DTX, &attr->dtx);
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return cloned;
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}
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static void opus_generate_sdp_fmtp(const struct ast_format *format, unsigned int payload, struct ast_str **str)
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{
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struct opus_attr *attr = ast_format_get_attribute_data(format);
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int base_fmtp_size;
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int original_size;
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if (!attr) {
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/*
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* (Only) cached formats do not have attribute data assigned because
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* they were created before this attribute module was registered.
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* Therefore, we assume the default attribute values here.
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*/
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attr = &default_opus_attr;
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}
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original_size = ast_str_strlen(*str);
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base_fmtp_size = ast_str_append(str, 0, "a=fmtp:%u ", payload);
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if (CODEC_OPUS_DEFAULT_SAMPLE_RATE != attr->maxplayrate) {
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ast_str_append(str, 0, "%s=%d;",
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CODEC_OPUS_ATTR_MAX_PLAYBACK_RATE, attr->maxplayrate);
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}
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if (CODEC_OPUS_DEFAULT_SAMPLE_RATE != attr->spropmaxcapturerate) {
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ast_str_append(str, 0, "%s=%d;",
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CODEC_OPUS_ATTR_SPROP_MAX_CAPTURE_RATE, attr->spropmaxcapturerate);
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}
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if (CODEC_OPUS_DEFAULT_BITRATE != attr->maxbitrate || attr->maxbitrate > 0) {
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ast_str_append(str, 0, "%s=%d;",
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CODEC_OPUS_ATTR_MAX_AVERAGE_BITRATE, attr->maxbitrate);
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}
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if (CODEC_OPUS_DEFAULT_STEREO != attr->stereo) {
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ast_str_append(str, 0, "%s=%d;",
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CODEC_OPUS_ATTR_STEREO, attr->stereo);
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}
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if (CODEC_OPUS_DEFAULT_STEREO != attr->spropstereo) {
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ast_str_append(str, 0, "%s=%d;",
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CODEC_OPUS_ATTR_SPROP_STEREO, attr->spropstereo);
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}
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if (CODEC_OPUS_DEFAULT_CBR != attr->cbr) {
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ast_str_append(str, 0, "%s=%d;",
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CODEC_OPUS_ATTR_CBR, attr->cbr);
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}
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if (CODEC_OPUS_DEFAULT_FEC!= attr->fec) {
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ast_str_append(str, 0, "%s=%d;",
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CODEC_OPUS_ATTR_FEC, attr->fec);
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}
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if (CODEC_OPUS_DEFAULT_DTX != attr->dtx) {
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ast_str_append(str, 0, "%s=%d;",
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CODEC_OPUS_ATTR_DTX, attr->dtx);
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}
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if (base_fmtp_size == ast_str_strlen(*str) - original_size) {
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ast_str_truncate(*str, original_size);
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} else {
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ast_str_truncate(*str, -1);
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ast_str_append(str, 0, "\r\n");
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}
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}
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static struct ast_format *opus_getjoint(const struct ast_format *format1, const struct ast_format *format2)
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{
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struct opus_attr *attr1 = ast_format_get_attribute_data(format1);
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struct opus_attr *attr2 = ast_format_get_attribute_data(format2);
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struct ast_format *jointformat;
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struct opus_attr *attr_res;
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if (!attr1) {
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attr1 = &default_opus_attr;
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}
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if (!attr2) {
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attr2 = &default_opus_attr;
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}
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jointformat = ast_format_clone(format1);
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if (!jointformat) {
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return NULL;
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}
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if (ast_format_get_channel_count(format1) == 2 || ast_format_get_channel_count(format2) == 2) {
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ast_format_set_channel_count(jointformat, 2);
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}
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attr_res = ast_format_get_attribute_data(jointformat);
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attr_res->dtx = attr1->dtx || attr2->dtx ? 1 : 0;
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/* Only do FEC if both sides want it. If a peer specifically requests not
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* to receive with FEC, it may be a waste of bandwidth. */
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attr_res->fec = attr1->fec && attr2->fec ? 1 : 0;
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attr_res->cbr = attr1->cbr || attr2->cbr ? 1 : 0;
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attr_res->spropstereo = attr1->spropstereo || attr2->spropstereo ? 1 : 0;
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/* Only do stereo if both sides want it. If a peer specifically requests not
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* to receive stereo signals, it may be a waste of bandwidth. */
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attr_res->stereo = attr1->stereo && attr2->stereo ? 1 : 0;
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if (attr1->maxbitrate < 0) {
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attr_res->maxbitrate = attr2->maxbitrate;
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} else if (attr2->maxbitrate < 0) {
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attr_res->maxbitrate = attr1->maxbitrate;
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} else {
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attr_res->maxbitrate = MIN(attr1->maxbitrate, attr2->maxbitrate);
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}
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attr_res->spropmaxcapturerate = MIN(attr1->spropmaxcapturerate, attr2->spropmaxcapturerate);
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attr_res->maxplayrate = MIN(attr1->maxplayrate, attr2->maxplayrate);
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return jointformat;
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}
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static struct ast_format *opus_set(const struct ast_format *format,
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const char *name, const char *value)
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{
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struct ast_format *cloned;
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struct opus_attr *attr;
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int val;
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if (!(cloned = ast_format_clone(format))) {
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return NULL;
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}
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attr = ast_format_get_attribute_data(cloned);
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if (!strcmp(name, CODEC_OPUS_ATTR_DATA)) {
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ao2_cleanup(attr->data);
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attr->data = ao2_bump((void*)value);
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return cloned;
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}
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if (sscanf(value, "%30d", &val) != 1) {
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ast_log(LOG_WARNING, "Unknown value '%s' for attribute type '%s'\n",
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value, name);
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ao2_ref(cloned, -1);
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return NULL;
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}
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if (!strcasecmp(name, CODEC_OPUS_ATTR_MAX_PLAYBACK_RATE)) {
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attr->maxplayrate = val;
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} else if (!strcasecmp(name, CODEC_OPUS_ATTR_MAX_CODED_AUDIO_BANDWIDTH)) {
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attr->maxplayrate = val;
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} else if (!strcasecmp(name, CODEC_OPUS_ATTR_SPROP_MAX_CAPTURE_RATE)) {
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attr->spropmaxcapturerate = val;
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} else if (!strcasecmp(name, CODEC_OPUS_ATTR_MAX_PTIME)) {
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attr->maxptime = val;
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} else if (!strcasecmp(name, CODEC_OPUS_ATTR_PTIME)) {
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attr->ptime = val;
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} else if (!strcasecmp(name, CODEC_OPUS_ATTR_MAX_AVERAGE_BITRATE)) {
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attr->maxbitrate = val;
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} else if (!strcasecmp(name, CODEC_OPUS_ATTR_STEREO)) {
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attr->stereo = val;
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} else if (!strcasecmp(name, CODEC_OPUS_ATTR_SPROP_STEREO)) {
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attr->spropstereo = val;
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} else if (!strcasecmp(name, CODEC_OPUS_ATTR_CBR)) {
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attr->cbr = val;
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} else if (!strcasecmp(name, CODEC_OPUS_ATTR_FEC)) {
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attr->fec = val;
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} else if (!strcasecmp(name, CODEC_OPUS_ATTR_DTX)) {
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attr->dtx = val;
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} else {
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ast_log(LOG_WARNING, "unknown attribute type %s\n", name);
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}
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return cloned;
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}
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static const void *opus_get(const struct ast_format *format, const char *name)
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{
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struct opus_attr *attr = ast_format_get_attribute_data(format);
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int *val = NULL;
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if (!attr) {
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return NULL;
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}
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if (!strcasecmp(name, CODEC_OPUS_ATTR_DATA)) {
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return ao2_bump(attr->data);
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} else if (!strcasecmp(name, CODEC_OPUS_ATTR_MAX_PLAYBACK_RATE)) {
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val = &attr->maxplayrate;
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} else if (!strcasecmp(name, CODEC_OPUS_ATTR_SPROP_MAX_CAPTURE_RATE)) {
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val = &attr->spropmaxcapturerate;
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} else if (!strcasecmp(name, CODEC_OPUS_ATTR_MAX_PTIME)) {
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val = &attr->maxptime;
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} else if (!strcasecmp(name, CODEC_OPUS_ATTR_PTIME)) {
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val = &attr->ptime;
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} else if (!strcasecmp(name, CODEC_OPUS_ATTR_MAX_AVERAGE_BITRATE)) {
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val = &attr->maxbitrate;
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} else if (!strcasecmp(name, CODEC_OPUS_ATTR_STEREO)) {
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val = &attr->stereo;
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} else if (!strcasecmp(name, CODEC_OPUS_ATTR_SPROP_STEREO)) {
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val = &attr->spropstereo;
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} else if (!strcasecmp(name, CODEC_OPUS_ATTR_CBR)) {
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val = &attr->cbr;
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} else if (!strcasecmp(name, CODEC_OPUS_ATTR_FEC)) {
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val = &attr->fec;
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} else if (!strcasecmp(name, CODEC_OPUS_ATTR_DTX)) {
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val = &attr->dtx;
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} else {
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ast_log(LOG_WARNING, "unknown attribute type %s\n", name);
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}
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return val;
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}
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static struct ast_format_interface opus_interface = {
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.format_destroy = opus_destroy,
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.format_clone = opus_clone,
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.format_get_joint = opus_getjoint,
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.format_attribute_set = opus_set,
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.format_parse_sdp_fmtp = opus_parse_sdp_fmtp,
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.format_generate_sdp_fmtp = opus_generate_sdp_fmtp,
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.format_attribute_get = opus_get
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};
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static int load_module(void)
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{
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if (__ast_format_interface_register("opus", &opus_interface, ast_module_info->self)) {
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return AST_MODULE_LOAD_DECLINE;
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}
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return AST_MODULE_LOAD_SUCCESS;
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}
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static int unload_module(void)
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{
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return 0;
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}
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS | AST_MODFLAG_LOAD_ORDER, "Opus Format Attribute Module",
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.support_level = AST_MODULE_SUPPORT_CORE,
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.load = load_module,
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.unload = unload_module,
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.load_pri = AST_MODPRI_REALTIME_DRIVER /* Needs to load before codec_opus */
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);
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