mirror of https://github.com/asterisk/asterisk
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
261 lines
7.4 KiB
261 lines
7.4 KiB
/*
|
|
* Asterisk -- An open source telephony toolkit.
|
|
*
|
|
* Copyright (C) 2013, Digium, Inc.
|
|
*
|
|
* Lorenzo Miniero <lorenzo@meetecho.com>
|
|
*
|
|
* See http://www.asterisk.org for more information about
|
|
* the Asterisk project. Please do not directly contact
|
|
* any of the maintainers of this project for assistance;
|
|
* the project provides a web site, mailing lists and IRC
|
|
* channels for your use.
|
|
*
|
|
* This program is free software, distributed under the terms of
|
|
* the GNU General Public License Version 2. See the LICENSE file
|
|
* at the top of the source tree.
|
|
*/
|
|
|
|
/*!
|
|
* \file
|
|
* \brief Opus format attribute interface
|
|
*
|
|
* \author Lorenzo Miniero <lorenzo@meetecho.com>
|
|
*/
|
|
|
|
/*** MODULEINFO
|
|
<support_level>core</support_level>
|
|
***/
|
|
|
|
#include "asterisk.h"
|
|
|
|
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
|
|
|
|
#include "asterisk/module.h"
|
|
#include "asterisk/format.h"
|
|
|
|
/*!
|
|
* \brief Opus attribute structure.
|
|
*
|
|
* \note http://tools.ietf.org/html/draft-ietf-payload-rtp-opus-00.
|
|
*/
|
|
struct opus_attr {
|
|
unsigned int maxbitrate; /* Default 64-128 kb/s for FB stereo music */
|
|
unsigned int maxplayrate /* Default 48000 */;
|
|
unsigned int minptime; /* Default 3, but it's 10 in format.c */
|
|
unsigned int stereo; /* Default 0 */
|
|
unsigned int cbr; /* Default 0 */
|
|
unsigned int fec; /* Default 0 */
|
|
unsigned int dtx; /* Default 0 */
|
|
unsigned int spropmaxcapturerate; /* Default 48000 */
|
|
unsigned int spropstereo; /* Default 0 */
|
|
};
|
|
|
|
static void opus_destroy(struct ast_format *format)
|
|
{
|
|
struct opus_attr *attr = ast_format_get_attribute_data(format);
|
|
|
|
ast_free(attr);
|
|
}
|
|
|
|
static int opus_clone(const struct ast_format *src, struct ast_format *dst)
|
|
{
|
|
struct opus_attr *original = ast_format_get_attribute_data(src);
|
|
struct opus_attr *attr = ast_calloc(1, sizeof(*attr));
|
|
|
|
if (!attr) {
|
|
return -1;
|
|
}
|
|
|
|
if (original) {
|
|
*attr = *original;
|
|
}
|
|
|
|
ast_format_set_attribute_data(dst, attr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct ast_format *opus_parse_sdp_fmtp(const struct ast_format *format, const char *attributes)
|
|
{
|
|
struct ast_format *cloned;
|
|
struct opus_attr *attr;
|
|
const char *kvp;
|
|
unsigned int val;
|
|
|
|
cloned = ast_format_clone(format);
|
|
if (!cloned) {
|
|
return NULL;
|
|
}
|
|
attr = ast_format_get_attribute_data(cloned);
|
|
|
|
if ((kvp = strstr(attributes, "maxplaybackrate")) && sscanf(kvp, "maxplaybackrate=%30u", &val) == 1) {
|
|
attr->maxplayrate = val;
|
|
}
|
|
if ((kvp = strstr(attributes, "sprop-maxcapturerate")) && sscanf(kvp, "sprop-maxcapturerate=%30u", &val) == 1) {
|
|
attr->spropmaxcapturerate = val;
|
|
}
|
|
if ((kvp = strstr(attributes, "minptime")) && sscanf(kvp, "minptime=%30u", &val) == 1) {
|
|
attr->minptime = val;
|
|
}
|
|
if ((kvp = strstr(attributes, "maxaveragebitrate")) && sscanf(kvp, "maxaveragebitrate=%30u", &val) == 1) {
|
|
attr->maxbitrate = val;
|
|
}
|
|
if ((kvp = strstr(attributes, " stereo")) && sscanf(kvp, " stereo=%30u", &val) == 1) {
|
|
attr->stereo = val;
|
|
}
|
|
if ((kvp = strstr(attributes, ";stereo")) && sscanf(kvp, ";stereo=%30u", &val) == 1) {
|
|
attr->stereo = val;
|
|
}
|
|
if ((kvp = strstr(attributes, "sprop-stereo")) && sscanf(kvp, "sprop-stereo=%30u", &val) == 1) {
|
|
attr->spropstereo = val;
|
|
}
|
|
if ((kvp = strstr(attributes, "cbr")) && sscanf(kvp, "cbr=%30u", &val) == 1) {
|
|
attr->cbr = val;
|
|
}
|
|
if ((kvp = strstr(attributes, "useinbandfec")) && sscanf(kvp, "useinbandfec=%30u", &val) == 1) {
|
|
attr->fec = val;
|
|
}
|
|
if ((kvp = strstr(attributes, "usedtx")) && sscanf(kvp, "usedtx=%30u", &val) == 1) {
|
|
attr->dtx = val;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void opus_generate_sdp_fmtp(const struct ast_format *format, unsigned int payload, struct ast_str **str)
|
|
{
|
|
struct opus_attr *attr = ast_format_get_attribute_data(format);
|
|
|
|
if (!attr) {
|
|
return;
|
|
}
|
|
|
|
/* FIXME should we only generate attributes that were explicitly set? */
|
|
ast_str_append(str, 0,
|
|
"a=fmtp:%u "
|
|
"maxplaybackrate=%u;"
|
|
"sprop-maxcapturerate=%u;"
|
|
"minptime=%u;"
|
|
"maxaveragebitrate=%u;"
|
|
"stereo=%d;"
|
|
"sprop-stereo=%d;"
|
|
"cbr=%d;"
|
|
"useinbandfec=%d;"
|
|
"usedtx=%d\r\n",
|
|
payload,
|
|
attr->maxplayrate ? attr->maxplayrate : 48000, /* maxplaybackrate */
|
|
attr->spropmaxcapturerate ? attr->spropmaxcapturerate : 48000, /* sprop-maxcapturerate */
|
|
attr->minptime > 10 ? attr->minptime : 10, /* minptime */
|
|
attr->maxbitrate ? attr->maxbitrate : 20000, /* maxaveragebitrate */
|
|
attr->stereo ? 1 : 0, /* stereo */
|
|
attr->spropstereo ? 1 : 0, /* sprop-stereo */
|
|
attr->cbr ? 1 : 0, /* cbr */
|
|
attr->fec ? 1 : 0, /* useinbandfec */
|
|
attr->dtx ? 1 : 0 /* usedtx */
|
|
);
|
|
}
|
|
|
|
static struct ast_format *opus_getjoint(const struct ast_format *format1, const struct ast_format *format2)
|
|
{
|
|
struct opus_attr *attr1 = ast_format_get_attribute_data(format1);
|
|
struct opus_attr *attr2 = ast_format_get_attribute_data(format2);
|
|
struct ast_format *jointformat;
|
|
struct opus_attr *attr_res;
|
|
|
|
jointformat = ast_format_clone(format1);
|
|
if (!jointformat) {
|
|
return NULL;
|
|
}
|
|
attr_res = ast_format_get_attribute_data(jointformat);
|
|
|
|
/* Only do dtx if both sides want it. DTX is a trade off between
|
|
* computational complexity and bandwidth. */
|
|
attr_res->dtx = attr1->dtx && attr2->dtx ? 1 : 0;
|
|
|
|
/* Only do FEC if both sides want it. If a peer specifically requests not
|
|
* to receive with FEC, it may be a waste of bandwidth. */
|
|
attr_res->fec = attr1->fec && attr2->fec ? 1 : 0;
|
|
|
|
/* Only do stereo if both sides want it. If a peer specifically requests not
|
|
* to receive stereo signals, it may be a waste of bandwidth. */
|
|
attr_res->stereo = attr1->stereo && attr2->stereo ? 1 : 0;
|
|
|
|
/* FIXME: do we need to join other attributes as well, e.g., minptime, cbr, etc.? */
|
|
|
|
return jointformat;
|
|
}
|
|
|
|
static struct ast_format *opus_set(const struct ast_format *format, const char *name, const char *value)
|
|
{
|
|
struct ast_format *cloned;
|
|
struct opus_attr *attr;
|
|
unsigned int val;
|
|
|
|
if (sscanf(value, "%30u", &val) != 1) {
|
|
ast_log(LOG_WARNING, "Unknown value '%s' for attribute type '%s'\n",
|
|
value, name);
|
|
return NULL;
|
|
}
|
|
|
|
cloned = ast_format_clone(format);
|
|
if (!cloned) {
|
|
return NULL;
|
|
}
|
|
attr = ast_format_get_attribute_data(cloned);
|
|
|
|
if (!strcasecmp(name, "max_bitrate")) {
|
|
attr->maxbitrate = val;
|
|
} else if (!strcasecmp(name, "max_playrate")) {
|
|
attr->maxplayrate = val;
|
|
} else if (!strcasecmp(name, "minptime")) {
|
|
attr->minptime = val;
|
|
} else if (!strcasecmp(name, "stereo")) {
|
|
attr->stereo = val;
|
|
} else if (!strcasecmp(name, "cbr")) {
|
|
attr->cbr = val;
|
|
} else if (!strcasecmp(name, "fec")) {
|
|
attr->fec = val;
|
|
} else if (!strcasecmp(name, "dtx")) {
|
|
attr->dtx = val;
|
|
} else if (!strcasecmp(name, "sprop_capture_rate")) {
|
|
attr->spropmaxcapturerate = val;
|
|
} else if (!strcasecmp(name, "sprop_stereo")) {
|
|
attr->spropstereo = val;
|
|
} else {
|
|
ast_log(LOG_WARNING, "unknown attribute type %s\n", name);
|
|
}
|
|
|
|
return cloned;
|
|
}
|
|
|
|
static struct ast_format_interface opus_interface = {
|
|
.format_destroy = opus_destroy,
|
|
.format_clone = opus_clone,
|
|
.format_get_joint = opus_getjoint,
|
|
.format_attribute_set = opus_set,
|
|
.format_parse_sdp_fmtp = opus_parse_sdp_fmtp,
|
|
.format_generate_sdp_fmtp = opus_generate_sdp_fmtp,
|
|
};
|
|
|
|
static int load_module(void)
|
|
{
|
|
if (ast_format_interface_register("opus", &opus_interface)) {
|
|
return AST_MODULE_LOAD_DECLINE;
|
|
}
|
|
|
|
return AST_MODULE_LOAD_SUCCESS;
|
|
}
|
|
|
|
static int unload_module(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Opus Format Attribute Module",
|
|
.support_level = AST_MODULE_SUPPORT_CORE,
|
|
.load = load_module,
|
|
.unload = unload_module,
|
|
.load_pri = AST_MODPRI_CHANNEL_DEPEND,
|
|
);
|