mirror of
https://github.com/asterisk/asterisk.git
synced 2025-10-31 18:55:19 +00:00
dcc01bc0a7
Beside that, the format-attribute module sends only non-default values in the line fmtp, now. This avoids unnecessary overhead in SDP messages. Furthermore, previously the parameter stereo was not parsed when being the first parameter. ASTERISK-25583 #close Change-Id: Iae85ba3e5960bfd5d51cf65bcffad00dd4875a73
367 lines
9.1 KiB
C
367 lines
9.1 KiB
C
/*
|
|
* 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_REGISTER_FILE()
|
|
|
|
#include "asterisk/module.h"
|
|
#include "asterisk/format.h"
|
|
#include "asterisk/logger.h" /* for ast_log, LOG_WARNING */
|
|
#include "asterisk/strings.h" /* for ast_str_append */
|
|
#include "asterisk/utils.h" /* for MIN, ast_malloc, ast_free */
|
|
|
|
/*!
|
|
* \brief Opus attribute structure.
|
|
*
|
|
* \note http://tools.ietf.org/html/rfc7587#section-6
|
|
*/
|
|
struct opus_attr {
|
|
unsigned int maxbitrate;
|
|
unsigned int maxplayrate;
|
|
unsigned int unused; /* was minptime, kept for binary compatibility */
|
|
unsigned int stereo;
|
|
unsigned int cbr;
|
|
unsigned int fec;
|
|
unsigned int dtx;
|
|
unsigned int spropmaxcapturerate;
|
|
unsigned int spropstereo;
|
|
};
|
|
|
|
static struct opus_attr default_opus_attr = {
|
|
.maxplayrate = 48000,
|
|
.spropmaxcapturerate = 48000,
|
|
.maxbitrate = 510000,
|
|
.stereo = 0,
|
|
.spropstereo = 0,
|
|
.cbr = 0,
|
|
.fec = 1,
|
|
.dtx = 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_malloc(sizeof(*attr));
|
|
|
|
if (!attr) {
|
|
return -1;
|
|
}
|
|
|
|
if (original) {
|
|
*attr = *original;
|
|
} else {
|
|
*attr = default_opus_attr;
|
|
}
|
|
|
|
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;
|
|
} else {
|
|
attr->maxplayrate = 48000;
|
|
}
|
|
|
|
if ((kvp = strstr(attributes, "sprop-maxcapturerate")) && sscanf(kvp, "sprop-maxcapturerate=%30u", &val) == 1) {
|
|
attr->spropmaxcapturerate = val;
|
|
} else {
|
|
attr->spropmaxcapturerate = 48000;
|
|
}
|
|
|
|
if ((kvp = strstr(attributes, "maxaveragebitrate")) && sscanf(kvp, "maxaveragebitrate=%30u", &val) == 1) {
|
|
attr->maxbitrate = val;
|
|
} else {
|
|
attr->maxbitrate = 510000;
|
|
}
|
|
|
|
if (!strncmp(attributes, "stereo=1", 8)) {
|
|
attr->stereo = 1;
|
|
} else if (strstr(attributes, " stereo=1")) {
|
|
attr->stereo = 1;
|
|
} else if (strstr(attributes, ";stereo=1")) {
|
|
attr->stereo = 1;
|
|
} else {
|
|
attr->stereo = 0;
|
|
}
|
|
|
|
if (strstr(attributes, "sprop-stereo=1")) {
|
|
attr->spropstereo = 1;
|
|
} else {
|
|
attr->spropstereo = 0;
|
|
}
|
|
|
|
if (strstr(attributes, "cbr=1")) {
|
|
attr->cbr = 1;
|
|
} else {
|
|
attr->cbr = 0;
|
|
}
|
|
|
|
if (strstr(attributes, "useinbandfec=1")) {
|
|
attr->fec = 1;
|
|
} else {
|
|
attr->fec = 0;
|
|
}
|
|
|
|
if (strstr(attributes, "usedtx=1")) {
|
|
attr->dtx = 1;
|
|
} else {
|
|
attr->dtx = 0;
|
|
}
|
|
|
|
return cloned;
|
|
}
|
|
|
|
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);
|
|
int added = 0;
|
|
|
|
if (!attr) {
|
|
/*
|
|
* (Only) cached formats do not have attribute data assigned because
|
|
* they were created before this attribute module was registered.
|
|
* Therefore, we assume the default attribute values here.
|
|
*/
|
|
attr = &default_opus_attr;
|
|
}
|
|
|
|
if (48000 != attr->maxplayrate) {
|
|
if (added) {
|
|
ast_str_append(str, 0, ";");
|
|
} else if (0 < ast_str_append(str, 0, "a=fmtp:%u ", payload)) {
|
|
added = 1;
|
|
}
|
|
ast_str_append(str, 0, "maxplaybackrate=%u", attr->maxplayrate);
|
|
}
|
|
|
|
if (48000 != attr->spropmaxcapturerate) {
|
|
if (added) {
|
|
ast_str_append(str, 0, ";");
|
|
} else if (0 < ast_str_append(str, 0, "a=fmtp:%u ", payload)) {
|
|
added = 1;
|
|
}
|
|
ast_str_append(str, 0, "sprop-maxcapturerate=%u", attr->spropmaxcapturerate);
|
|
}
|
|
|
|
if (510000 != attr->maxbitrate) {
|
|
if (added) {
|
|
ast_str_append(str, 0, ";");
|
|
} else if (0 < ast_str_append(str, 0, "a=fmtp:%u ", payload)) {
|
|
added = 1;
|
|
}
|
|
ast_str_append(str, 0, "maxaveragebitrate=%u", attr->maxbitrate);
|
|
}
|
|
|
|
if (0 != attr->stereo) {
|
|
if (added) {
|
|
ast_str_append(str, 0, ";");
|
|
} else if (0 < ast_str_append(str, 0, "a=fmtp:%u ", payload)) {
|
|
added = 1;
|
|
}
|
|
ast_str_append(str, 0, "stereo=%u", attr->stereo);
|
|
}
|
|
|
|
if (0 != attr->spropstereo) {
|
|
if (added) {
|
|
ast_str_append(str, 0, ";");
|
|
} else if (0 < ast_str_append(str, 0, "a=fmtp:%u ", payload)) {
|
|
added = 1;
|
|
}
|
|
ast_str_append(str, 0, "sprop-stereo=%u", attr->spropstereo);
|
|
}
|
|
|
|
if (0 != attr->cbr) {
|
|
if (added) {
|
|
ast_str_append(str, 0, ";");
|
|
} else if (0 < ast_str_append(str, 0, "a=fmtp:%u ", payload)) {
|
|
added = 1;
|
|
}
|
|
ast_str_append(str, 0, "cbr=%u", attr->cbr);
|
|
}
|
|
|
|
if (0 != attr->fec) {
|
|
if (added) {
|
|
ast_str_append(str, 0, ";");
|
|
} else if (0 < ast_str_append(str, 0, "a=fmtp:%u ", payload)) {
|
|
added = 1;
|
|
}
|
|
ast_str_append(str, 0, "useinbandfec=%u", attr->fec);
|
|
}
|
|
|
|
if (0 != attr->dtx) {
|
|
if (added) {
|
|
ast_str_append(str, 0, ";");
|
|
} else if (0 < ast_str_append(str, 0, "a=fmtp:%u ", payload)) {
|
|
added = 1;
|
|
}
|
|
ast_str_append(str, 0, "usedtx=%u", attr->dtx);
|
|
}
|
|
|
|
if (added) {
|
|
ast_str_append(str, 0, "\r\n");
|
|
}
|
|
}
|
|
|
|
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;
|
|
|
|
if (!attr1) {
|
|
attr1 = &default_opus_attr;
|
|
}
|
|
|
|
if (!attr2) {
|
|
attr2 = &default_opus_attr;
|
|
}
|
|
|
|
jointformat = ast_format_clone(format1);
|
|
if (!jointformat) {
|
|
return NULL;
|
|
}
|
|
attr_res = ast_format_get_attribute_data(jointformat);
|
|
|
|
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;
|
|
|
|
attr_res->cbr = attr1->cbr || attr2->cbr ? 1 : 0;
|
|
attr_res->spropstereo = attr1->spropstereo || attr2->spropstereo ? 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;
|
|
|
|
attr_res->maxbitrate = MIN(attr1->maxbitrate, attr2->maxbitrate);
|
|
attr_res->spropmaxcapturerate = MIN(attr1->spropmaxcapturerate, attr2->spropmaxcapturerate);
|
|
attr_res->maxplayrate = MIN(attr1->maxplayrate, attr2->maxplayrate);
|
|
|
|
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->unused = 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,
|
|
);
|