322 lines
8.8 KiB
C
322 lines
8.8 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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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/module.h"
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#include "asterisk/format.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/draft-ietf-payload-rtp-opus-00.
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*/
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struct opus_attr {
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unsigned int maxbitrate; /* Default 64-128 kb/s for FB stereo music */
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unsigned int maxplayrate /* Default 48000 */;
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unsigned int minptime; /* Default 3, but it's 10 in format.c */
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unsigned int stereo; /* Default 0 */
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unsigned int cbr; /* Default 0 */
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unsigned int fec; /* Default 0 */
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unsigned int dtx; /* Default 0 */
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unsigned int spropmaxcapturerate; /* Default 48000 */
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unsigned int spropstereo; /* Default 0 */
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};
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static int opus_sdp_parse(struct ast_format_attr *format_attr, const char *attributes)
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{
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struct opus_attr *attr = (struct opus_attr *) format_attr;
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const char *kvp;
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unsigned int val;
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if ((kvp = strstr(attributes, "maxplaybackrate")) && sscanf(kvp, "maxplaybackrate=%30u", &val) == 1) {
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attr->maxplayrate = val;
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}
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if ((kvp = strstr(attributes, "sprop-maxcapturerate")) && sscanf(kvp, "sprop-maxcapturerate=%30u", &val) == 1) {
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attr->spropmaxcapturerate = val;
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}
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if ((kvp = strstr(attributes, "minptime")) && sscanf(kvp, "minptime=%30u", &val) == 1) {
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attr->minptime = val;
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}
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if ((kvp = strstr(attributes, "maxaveragebitrate")) && sscanf(kvp, "maxaveragebitrate=%30u", &val) == 1) {
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attr->maxbitrate = val;
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}
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if ((kvp = strstr(attributes, " stereo")) && sscanf(kvp, " stereo=%30u", &val) == 1) {
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attr->stereo = val;
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}
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if ((kvp = strstr(attributes, ";stereo")) && sscanf(kvp, ";stereo=%30u", &val) == 1) {
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attr->stereo = val;
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}
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if ((kvp = strstr(attributes, "sprop-stereo")) && sscanf(kvp, "sprop-stereo=%30u", &val) == 1) {
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attr->spropstereo = val;
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}
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if ((kvp = strstr(attributes, "cbr")) && sscanf(kvp, "cbr=%30u", &val) == 1) {
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attr->cbr = val;
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}
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if ((kvp = strstr(attributes, "useinbandfec")) && sscanf(kvp, "useinbandfec=%30u", &val) == 1) {
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attr->fec = val;
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}
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if ((kvp = strstr(attributes, "usedtx")) && sscanf(kvp, "usedtx=%30u", &val) == 1) {
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attr->dtx = val;
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}
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return 0;
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}
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static void opus_sdp_generate(const struct ast_format_attr *format_attr, unsigned int payload, struct ast_str **str)
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{
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struct opus_attr *attr = (struct opus_attr *) format_attr;
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/* FIXME should we only generate attributes that were explicitly set? */
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ast_str_append(str, 0,
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"a=fmtp:%u "
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"maxplaybackrate=%u;"
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"sprop-maxcapturerate=%u;"
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"minptime=%u;"
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"maxaveragebitrate=%u;"
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"stereo=%d;"
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"sprop-stereo=%d;"
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"cbr=%d;"
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"useinbandfec=%d;"
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"usedtx=%d\r\n",
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payload,
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attr->maxplayrate ? attr->maxplayrate : 48000, /* maxplaybackrate */
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attr->spropmaxcapturerate ? attr->spropmaxcapturerate : 48000, /* sprop-maxcapturerate */
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attr->minptime > 10 ? attr->minptime : 10, /* minptime */
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attr->maxbitrate ? attr->maxbitrate : 20000, /* maxaveragebitrate */
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attr->stereo ? 1 : 0, /* stereo */
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attr->spropstereo ? 1 : 0, /* sprop-stereo */
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attr->cbr ? 1 : 0, /* cbr */
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attr->fec ? 1 : 0, /* useinbandfec */
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attr->dtx ? 1 : 0 /* usedtx */
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);
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}
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static int opus_get_val(const struct ast_format_attr *fattr, int key, void *result)
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{
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const struct opus_attr *attr = (struct opus_attr *) fattr;
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int *val = result;
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switch (key) {
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case OPUS_ATTR_KEY_MAX_BITRATE:
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*val = attr->maxbitrate;
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break;
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case OPUS_ATTR_KEY_MAX_PLAYRATE:
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*val = attr->maxplayrate;
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break;
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case OPUS_ATTR_KEY_MINPTIME:
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*val = attr->minptime;
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break;
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case OPUS_ATTR_KEY_STEREO:
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*val = attr->stereo;
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break;
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case OPUS_ATTR_KEY_CBR:
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*val = attr->cbr;
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break;
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case OPUS_ATTR_KEY_FEC:
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*val = attr->fec;
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break;
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case OPUS_ATTR_KEY_DTX:
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*val = attr->dtx;
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break;
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case OPUS_ATTR_KEY_SPROP_CAPTURE_RATE:
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*val = attr->spropmaxcapturerate;
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break;
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case OPUS_ATTR_KEY_SPROP_STEREO:
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*val = attr->spropstereo;
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break;
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default:
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ast_log(LOG_WARNING, "unknown attribute type %d\n", key);
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return -1;
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}
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return 0;
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}
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static int opus_isset(const struct ast_format_attr *fattr, va_list ap)
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{
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enum opus_attr_keys key;
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const struct opus_attr *attr = (struct opus_attr *) fattr;
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for (key = va_arg(ap, int);
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key != AST_FORMAT_ATTR_END;
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key = va_arg(ap, int))
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{
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switch (key) {
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case OPUS_ATTR_KEY_MAX_BITRATE:
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if (attr->maxbitrate != (va_arg(ap, int))) {
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return -1;
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}
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break;
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case OPUS_ATTR_KEY_MAX_PLAYRATE:
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if (attr->maxplayrate != (va_arg(ap, int))) {
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return -1;
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}
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break;
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case OPUS_ATTR_KEY_MINPTIME:
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if (attr->minptime != (va_arg(ap, int))) {
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return -1;
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}
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break;
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case OPUS_ATTR_KEY_STEREO:
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if (attr->stereo != (va_arg(ap, int))) {
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return -1;
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}
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break;
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case OPUS_ATTR_KEY_CBR:
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if (attr->cbr != (va_arg(ap, int))) {
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return -1;
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}
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break;
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case OPUS_ATTR_KEY_FEC:
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if (attr->fec != (va_arg(ap, int))) {
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return -1;
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}
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break;
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case OPUS_ATTR_KEY_DTX:
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if (attr->dtx != (va_arg(ap, int))) {
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return -1;
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}
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break;
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case OPUS_ATTR_KEY_SPROP_CAPTURE_RATE:
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if (attr->spropmaxcapturerate != (va_arg(ap, int))) {
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return -1;
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}
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break;
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case OPUS_ATTR_KEY_SPROP_STEREO:
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if (attr->spropstereo != (va_arg(ap, int))) {
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return -1;
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}
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break;
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default:
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ast_log(LOG_WARNING, "unknown attribute type %u\n", key);
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return -1;
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}
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}
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return 0;
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}
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static int opus_getjoint(const struct ast_format_attr *fattr1, const struct ast_format_attr *fattr2, struct ast_format_attr *result)
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{
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struct opus_attr *attr1 = (struct opus_attr *) fattr1;
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struct opus_attr *attr2 = (struct opus_attr *) fattr2;
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struct opus_attr *attr_res = (struct opus_attr *) result;
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int joint = 0;
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/* Only do dtx if both sides want it. DTX is a trade off between
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* computational complexity and bandwidth. */
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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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/* 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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/* FIXME: do we need to join other attributes as well, e.g., minptime, cbr, etc.? */
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return joint;
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}
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static void opus_set(struct ast_format_attr *fattr, va_list ap)
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{
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enum opus_attr_keys key;
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struct opus_attr *attr = (struct opus_attr *) fattr;
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for (key = va_arg(ap, int);
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key != AST_FORMAT_ATTR_END;
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key = va_arg(ap, int))
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{
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switch (key) {
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case OPUS_ATTR_KEY_MAX_BITRATE:
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attr->maxbitrate = (va_arg(ap, int));
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break;
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case OPUS_ATTR_KEY_MAX_PLAYRATE:
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attr->maxplayrate = (va_arg(ap, int));
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break;
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case OPUS_ATTR_KEY_MINPTIME:
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attr->minptime = (va_arg(ap, int));
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break;
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case OPUS_ATTR_KEY_STEREO:
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attr->stereo = (va_arg(ap, int));
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break;
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case OPUS_ATTR_KEY_CBR:
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attr->cbr = (va_arg(ap, int));
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break;
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case OPUS_ATTR_KEY_FEC:
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attr->fec = (va_arg(ap, int));
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break;
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case OPUS_ATTR_KEY_DTX:
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attr->dtx = (va_arg(ap, int));
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break;
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case OPUS_ATTR_KEY_SPROP_CAPTURE_RATE:
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attr->spropmaxcapturerate = (va_arg(ap, int));
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break;
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case OPUS_ATTR_KEY_SPROP_STEREO:
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attr->spropstereo = (va_arg(ap, int));
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break;
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default:
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ast_log(LOG_WARNING, "unknown attribute type %u\n", key);
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}
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}
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}
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static struct ast_format_attr_interface opus_interface = {
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.id = AST_FORMAT_OPUS,
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.format_attr_get_joint = opus_getjoint,
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.format_attr_set = opus_set,
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.format_attr_isset = opus_isset,
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.format_attr_get_val = opus_get_val,
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.format_attr_sdp_parse = opus_sdp_parse,
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.format_attr_sdp_generate = opus_sdp_generate,
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};
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static int load_module(void)
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{
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if (ast_format_attr_reg_interface(&opus_interface)) {
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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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ast_format_attr_unreg_interface(&opus_interface);
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return 0;
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}
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Opus Format Attribute Module",
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.load = load_module,
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.unload = unload_module,
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.load_pri = AST_MODPRI_CHANNEL_DEPEND,
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);
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