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res_format_attr_opus: Update to latest RFC 7587.

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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
This commit is contained in:
Alexander Traud
2015-11-21 12:35:33 +01:00
parent 5ec076b3b8
commit dcc01bc0a7
1 changed files with 151 additions and 59 deletions
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210
res/res_format_attr_opus.c
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@@ -33,28 +33,36 @@ 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/draft-ietf-payload-rtp-opus-00.
* \note http://tools.ietf.org/html/rfc7587#section-6
*/
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 */
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 = {
.fec = 0,
.dtx = 0,
.stereo = 0,
.maxplayrate = 48000,
.spropmaxcapturerate = 48000,
.maxbitrate = 510000,
.stereo = 0,
.spropstereo = 0,
.cbr = 0,
.fec = 1,
.dtx = 0,
};
static void opus_destroy(struct ast_format *format)
@@ -67,7 +75,7 @@ static void opus_destroy(struct ast_format *format)
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));
struct opus_attr *attr = ast_malloc(sizeof(*attr));
if (!attr) {
return -1;
@@ -75,6 +83,8 @@ static int opus_clone(const struct ast_format *src, struct ast_format *dst)
if (original) {
*attr = *original;
} else {
*attr = default_opus_attr;
}
ast_format_set_attribute_data(dst, attr);
@@ -97,33 +107,54 @@ static struct ast_format *opus_parse_sdp_fmtp(const struct ast_format *format, c
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, "minptime")) && sscanf(kvp, "minptime=%30u", &val) == 1) {
attr->minptime = val;
}
if ((kvp = strstr(attributes, "maxaveragebitrate")) && sscanf(kvp, "maxaveragebitrate=%30u", &val) == 1) {
attr->maxbitrate = val;
} else {
attr->maxbitrate = 510000;
}
if ((kvp = strstr(attributes, " stereo")) && sscanf(kvp, " stereo=%30u", &val) == 1) {
attr->stereo = val;
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 ((kvp = strstr(attributes, ";stereo")) && sscanf(kvp, ";stereo=%30u", &val) == 1) {
attr->stereo = val;
if (strstr(attributes, "sprop-stereo=1")) {
attr->spropstereo = 1;
} else {
attr->spropstereo = 0;
}
if ((kvp = strstr(attributes, "sprop-stereo")) && sscanf(kvp, "sprop-stereo=%30u", &val) == 1) {
attr->spropstereo = val;
if (strstr(attributes, "cbr=1")) {
attr->cbr = 1;
} else {
attr->cbr = 0;
}
if ((kvp = strstr(attributes, "cbr")) && sscanf(kvp, "cbr=%30u", &val) == 1) {
attr->cbr = val;
if (strstr(attributes, "useinbandfec=1")) {
attr->fec = 1;
} else {
attr->fec = 0;
}
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;
if (strstr(attributes, "usedtx=1")) {
attr->dtx = 1;
} else {
attr->dtx = 0;
}
return cloned;
@@ -132,34 +163,92 @@ static struct ast_format *opus_parse_sdp_fmtp(const struct ast_format *format, c
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) {
return;
/*
* (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;
}
/* 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 */
);
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)
@@ -183,19 +272,22 @@ static struct ast_format *opus_getjoint(const struct ast_format *format1, const
}
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;
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;
/* FIXME: do we need to join other attributes as well, e.g., minptime, cbr, etc.? */
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;
}
@@ -223,7 +315,7 @@ static struct ast_format *opus_set(const struct ast_format *format, const char *
} else if (!strcasecmp(name, "max_playrate")) {
attr->maxplayrate = val;
} else if (!strcasecmp(name, "minptime")) {
attr->minptime = val;
attr->unused = val;
} else if (!strcasecmp(name, "stereo")) {
attr->stereo = val;
} else if (!strcasecmp(name, "cbr")) {