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FFmpeg/libavformat/sdp.c

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/*
* copyright (c) 2007 Luca Abeni
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <string.h>
#include "libavutil/avstring.h"
#include "libavutil/base64.h"
#include "libavutil/dict.h"
#include "libavutil/parseutils.h"
#include "libavutil/opt.h"
#include "libavcodec/xiph.h"
#include "libavcodec/mpeg4audio.h"
#include "avformat.h"
#include "internal.h"
#include "avc.h"
#include "hevc.h"
#include "rtp.h"
#if CONFIG_NETWORK
#include "network.h"
#endif
#if CONFIG_RTP_MUXER
#define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2)
struct sdp_session_level {
int sdp_version; /**< protocol version (currently 0) */
int id; /**< session ID */
int version; /**< session version */
int start_time; /**< session start time (NTP time, in seconds),
or 0 in case of permanent session */
int end_time; /**< session end time (NTP time, in seconds),
or 0 if the session is not bounded */
int ttl; /**< TTL, in case of multicast stream */
const char *user; /**< username of the session's creator */
const char *src_addr; /**< IP address of the machine from which the session was created */
const char *src_type; /**< address type of src_addr */
const char *dst_addr; /**< destination IP address (can be multicast) */
const char *dst_type; /**< destination IP address type */
const char *name; /**< session name (can be an empty string) */
};
static void sdp_write_address(char *buff, int size, const char *dest_addr,
const char *dest_type, int ttl)
{
if (dest_addr) {
if (!dest_type)
dest_type = "IP4";
if (ttl > 0 && !strcmp(dest_type, "IP4")) {
/* The TTL should only be specified for IPv4 multicast addresses,
* not for IPv6. */
av_strlcatf(buff, size, "c=IN %s %s/%d\r\n", dest_type, dest_addr, ttl);
} else {
av_strlcatf(buff, size, "c=IN %s %s\r\n", dest_type, dest_addr);
}
}
}
static void sdp_write_header(char *buff, int size, struct sdp_session_level *s)
{
av_strlcatf(buff, size, "v=%d\r\n"
"o=- %d %d IN %s %s\r\n"
"s=%s\r\n",
s->sdp_version,
s->id, s->version, s->src_type, s->src_addr,
s->name);
sdp_write_address(buff, size, s->dst_addr, s->dst_type, s->ttl);
av_strlcatf(buff, size, "t=%d %d\r\n"
"a=tool:libavformat " AV_STRINGIFY(LIBAVFORMAT_VERSION) "\r\n",
s->start_time, s->end_time);
}
#if CONFIG_NETWORK
static int resolve_destination(char *dest_addr, int size, char *type,
int type_size)
{
struct addrinfo hints = { 0 }, *ai;
int is_multicast;
av_strlcpy(type, "IP4", type_size);
if (!dest_addr[0])
return 0;
/* Resolve the destination, since it must be written
* as a numeric IP address in the SDP. */
if (getaddrinfo(dest_addr, NULL, &hints, &ai))
return 0;
getnameinfo(ai->ai_addr, ai->ai_addrlen, dest_addr, size,
NULL, 0, NI_NUMERICHOST);
#ifdef AF_INET6
if (ai->ai_family == AF_INET6)
av_strlcpy(type, "IP6", type_size);
#endif
is_multicast = ff_is_multicast_address(ai->ai_addr);
freeaddrinfo(ai);
return is_multicast;
}
#else
static int resolve_destination(char *dest_addr, int size, char *type,
int type_size)
{
return 0;
}
#endif
static int sdp_get_address(char *dest_addr, int size, int *ttl, const char *url)
{
int port;
const char *p;
char proto[32];
av_url_split(proto, sizeof(proto), NULL, 0, dest_addr, size, &port, NULL, 0, url);
*ttl = 0;
if (strcmp(proto, "rtp") && strcmp(proto, "srtp")) {
/* The url isn't for the actual rtp sessions,
* don't parse out anything else than the destination.
*/
return 0;
}
p = strchr(url, '?');
if (p) {
char buff[64];
if (av_find_info_tag(buff, sizeof(buff), "ttl", p)) {
*ttl = strtol(buff, NULL, 10);
} else {
*ttl = 5;
}
}
return port;
}
#define MAX_PSET_SIZE 1024
static char *extradata2psets(AVFormatContext *s, AVCodecParameters *par)
{
char *psets, *p;
const uint8_t *r;
static const char pset_string[] = "; sprop-parameter-sets=";
static const char profile_string[] = "; profile-level-id=";
uint8_t *extradata = par->extradata;
int extradata_size = par->extradata_size;
uint8_t *tmpbuf = NULL;
const uint8_t *sps = NULL, *sps_end;
if (par->extradata_size > MAX_EXTRADATA_SIZE) {
av_log(s, AV_LOG_ERROR, "Too much extradata!\n");
return NULL;
}
if (par->extradata[0] == 1) {
if (ff_avc_write_annexb_extradata(par->extradata, &extradata,
&extradata_size))
return NULL;
tmpbuf = extradata;
}
psets = av_mallocz(MAX_PSET_SIZE);
if (!psets) {
av_log(s, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets.\n");
av_free(tmpbuf);
return NULL;
}
memcpy(psets, pset_string, strlen(pset_string));
p = psets + strlen(pset_string);
r = ff_avc_find_startcode(extradata, extradata + extradata_size);
while (r < extradata + extradata_size) {
const uint8_t *r1;
uint8_t nal_type;
while (!*(r++));
nal_type = *r & 0x1f;
r1 = ff_avc_find_startcode(r, extradata + extradata_size);
if (nal_type != 7 && nal_type != 8) { /* Only output SPS and PPS */
r = r1;
continue;
}
if (p != (psets + strlen(pset_string))) {
*p = ',';
p++;
}
if (!sps) {
sps = r;
sps_end = r1;
}
if (!av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r)) {
av_log(s, AV_LOG_ERROR, "Cannot Base64-encode %td %td!\n", MAX_PSET_SIZE - (p - psets), r1 - r);
av_free(psets);
av_free(tmpbuf);
return NULL;
}
p += strlen(p);
r = r1;
}
if (sps && sps_end - sps >= 4) {
memcpy(p, profile_string, strlen(profile_string));
p += strlen(p);
ff_data_to_hex(p, sps + 1, 3, 0);
p[6] = '\0';
}
av_free(tmpbuf);
return psets;
}
static char *extradata2psets_hevc(AVCodecParameters *par)
{
char *psets;
uint8_t *extradata = par->extradata;
int extradata_size = par->extradata_size;
uint8_t *tmpbuf = NULL;
int ps_pos[3] = { 0 };
static const char * const ps_names[3] = { "vps", "sps", "pps" };
int num_arrays, num_nalus;
int pos, i, j;
// Convert to hvcc format. Since we need to group multiple NALUs of
// the same type, and we might need to convert from one format to the
// other anyway, we get away with a little less work by using the hvcc
// format.
if (par->extradata[0] != 1) {
AVIOContext *pb;
if (avio_open_dyn_buf(&pb) < 0)
return NULL;
if (ff_isom_write_hvcc(pb, par->extradata, par->extradata_size, 0) < 0) {
avio_close_dyn_buf(pb, &tmpbuf);
goto err;
}
extradata_size = avio_close_dyn_buf(pb, &extradata);
tmpbuf = extradata;
}
if (extradata_size < 23)
goto err;
num_arrays = extradata[22];
pos = 23;
for (i = 0; i < num_arrays; i++) {
int num_nalus, nalu_type;
if (pos + 3 > extradata_size)
goto err;
nalu_type = extradata[pos] & 0x3f;
// Not including libavcodec/hevc.h to avoid confusion between
// NAL_* with the same name for both H264 and HEVC.
if (nalu_type == 32) // VPS
ps_pos[0] = pos;
else if (nalu_type == 33) // SPS
ps_pos[1] = pos;
else if (nalu_type == 34) // PPS
ps_pos[2] = pos;
num_nalus = AV_RB16(&extradata[pos + 1]);
pos += 3;
for (j = 0; j < num_nalus; j++) {
int len;
if (pos + 2 > extradata_size)
goto err;
len = AV_RB16(&extradata[pos]);
pos += 2;
if (pos + len > extradata_size)
goto err;
pos += len;
}
}
if (!ps_pos[0] || !ps_pos[1] || !ps_pos[2])
goto err;
psets = av_mallocz(MAX_PSET_SIZE);
if (!psets)
goto err;
psets[0] = '\0';
for (i = 0; i < 3; i++) {
pos = ps_pos[i];
if (i > 0)
av_strlcat(psets, "; ", MAX_PSET_SIZE);
av_strlcatf(psets, MAX_PSET_SIZE, "sprop-%s=", ps_names[i]);
// Skipping boundary checks in the input here; we've already traversed
// the whole hvcc structure above without issues
num_nalus = AV_RB16(&extradata[pos + 1]);
pos += 3;
for (j = 0; j < num_nalus; j++) {
int len = AV_RB16(&extradata[pos]);
int strpos;
pos += 2;
if (j > 0)
av_strlcat(psets, ",", MAX_PSET_SIZE);
strpos = strlen(psets);
if (!av_base64_encode(psets + strpos, MAX_PSET_SIZE - strpos,
&extradata[pos], len)) {
av_free(psets);
goto err;
}
pos += len;
}
}
av_free(tmpbuf);
return psets;
err:
av_free(tmpbuf);
return NULL;
}
static char *extradata2config(AVFormatContext *s, AVCodecParameters *par)
{
char *config;
if (par->extradata_size > MAX_EXTRADATA_SIZE) {
av_log(s, AV_LOG_ERROR, "Too much extradata!\n");
return NULL;
}
config = av_malloc(10 + par->extradata_size * 2);
if (!config) {
av_log(s, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
return NULL;
}
memcpy(config, "; config=", 9);
ff_data_to_hex(config + 9, par->extradata, par->extradata_size, 0);
config[9 + par->extradata_size * 2] = 0;
return config;
}
static char *xiph_extradata2config(AVFormatContext *s, AVCodecParameters *par)
{
char *config, *encoded_config;
uint8_t *header_start[3];
int headers_len, header_len[3], config_len;
int first_header_size;
switch (par->codec_id) {
case AV_CODEC_ID_THEORA:
first_header_size = 42;
break;
case AV_CODEC_ID_VORBIS:
first_header_size = 30;
break;
default:
av_log(s, AV_LOG_ERROR, "Unsupported Xiph codec ID\n");
return NULL;
}
if (avpriv_split_xiph_headers(par->extradata, par->extradata_size,
first_header_size, header_start,
header_len) < 0) {
av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
return NULL;
}
headers_len = header_len[0] + header_len[2];
config_len = 4 + // count
3 + // ident
2 + // packet size
1 + // header count
2 + // header size
headers_len; // and the rest
config = av_malloc(config_len);
if (!config)
goto xiph_fail;
encoded_config = av_malloc(AV_BASE64_SIZE(config_len));
if (!encoded_config) {
av_free(config);
goto xiph_fail;
}
config[0] = config[1] = config[2] = 0;
config[3] = 1;
config[4] = (RTP_XIPH_IDENT >> 16) & 0xff;
config[5] = (RTP_XIPH_IDENT >> 8) & 0xff;
config[6] = (RTP_XIPH_IDENT ) & 0xff;
config[7] = (headers_len >> 8) & 0xff;
config[8] = headers_len & 0xff;
config[9] = 2;
config[10] = header_len[0];
config[11] = 0; // size of comment header; nonexistent
memcpy(config + 12, header_start[0], header_len[0]);
memcpy(config + 12 + header_len[0], header_start[2], header_len[2]);
av_base64_encode(encoded_config, AV_BASE64_SIZE(config_len),
config, config_len);
av_free(config);
return encoded_config;
xiph_fail:
av_log(s, AV_LOG_ERROR,
"Not enough memory for configuration string\n");
return NULL;
}
static int latm_context2profilelevel(AVCodecParameters *par)
{
/* MP4A-LATM
* The RTP payload format specification is described in RFC 3016
* The encoding specifications are provided in ISO/IEC 14496-3 */
int profile_level = 0x2B;
/* TODO: AAC Profile only supports AAC LC Object Type.
* Different Object Types should implement different Profile Levels */
if (par->sample_rate <= 24000) {
if (par->channels <= 2)
profile_level = 0x28; // AAC Profile, Level 1
} else if (par->sample_rate <= 48000) {
if (par->channels <= 2) {
profile_level = 0x29; // AAC Profile, Level 2
} else if (par->channels <= 5) {
profile_level = 0x2A; // AAC Profile, Level 4
}
} else if (par->sample_rate <= 96000) {
if (par->channels <= 5) {
profile_level = 0x2B; // AAC Profile, Level 5
}
}
return profile_level;
}
static char *latm_context2config(AVFormatContext *s, AVCodecParameters *par)
{
/* MP4A-LATM
* The RTP payload format specification is described in RFC 3016
* The encoding specifications are provided in ISO/IEC 14496-3 */
uint8_t config_byte[6];
int rate_index;
char *config;
for (rate_index = 0; rate_index < 16; rate_index++)
if (avpriv_mpeg4audio_sample_rates[rate_index] == par->sample_rate)
break;
if (rate_index == 16) {
av_log(s, AV_LOG_ERROR, "Unsupported sample rate\n");
return NULL;
}
config_byte[0] = 0x40;
config_byte[1] = 0;
config_byte[2] = 0x20 | rate_index;
config_byte[3] = par->channels << 4;
config_byte[4] = 0x3f;
config_byte[5] = 0xc0;
config = av_malloc(6*2+1);
if (!config) {
av_log(s, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
return NULL;
}
ff_data_to_hex(config, config_byte, 6, 1);
config[12] = 0;
return config;
}
static char *sdp_write_media_attributes(char *buff, int size, AVCodecParameters *p, int payload_type, AVFormatContext *fmt)
{
char *config = NULL;
switch (p->codec_id) {
case AV_CODEC_ID_H264: {
int mode = 1;
if (fmt && fmt->oformat && fmt->oformat->priv_class &&
av_opt_flag_is_set(fmt->priv_data, "rtpflags", "h264_mode0"))
mode = 0;
if (p->extradata_size) {
config = extradata2psets(fmt, p);
}
av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n"
"a=fmtp:%d packetization-mode=%d%s\r\n",
payload_type,
payload_type, mode, config ? config : "");
break;
}
case AV_CODEC_ID_H261:
{
const char *pic_fmt = NULL;
/* only QCIF and CIF are specified as supported in RFC 4587 */
if (p->width == 176 && p->height == 144)
pic_fmt = "QCIF=1";
else if (p->width == 352 && p->height == 288)
pic_fmt = "CIF=1";
if (payload_type >= RTP_PT_PRIVATE)
av_strlcatf(buff, size, "a=rtpmap:%d H261/90000\r\n", payload_type);
if (pic_fmt)
av_strlcatf(buff, size, "a=fmtp:%d %s\r\n", payload_type, pic_fmt);
break;
}
case AV_CODEC_ID_H263:
case AV_CODEC_ID_H263P:
/* a=framesize is required by 3GPP TS 26.234 (PSS). It
* actually specifies the maximum video size, but we only know
* the current size. This is required for playback on Android
* stagefright and on Samsung bada. */
if (!fmt || !fmt->oformat->priv_class ||
!av_opt_flag_is_set(fmt->priv_data, "rtpflags", "rfc2190") ||
p->codec_id == AV_CODEC_ID_H263P)
av_strlcatf(buff, size, "a=rtpmap:%d H263-2000/90000\r\n"
"a=framesize:%d %d-%d\r\n",
payload_type,
payload_type, p->width, p->height);
break;
case AV_CODEC_ID_HEVC:
if (p->extradata_size)
config = extradata2psets_hevc(p);
av_strlcatf(buff, size, "a=rtpmap:%d H265/90000\r\n", payload_type);
if (config)
av_strlcatf(buff, size, "a=fmtp:%d %s\r\n",
payload_type, config);
break;
case AV_CODEC_ID_MPEG4:
if (p->extradata_size) {
config = extradata2config(fmt, p);
}
av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n"
"a=fmtp:%d profile-level-id=1%s\r\n",
payload_type,
payload_type, config ? config : "");
break;
case AV_CODEC_ID_AAC:
if (fmt && fmt->oformat->priv_class &&
av_opt_flag_is_set(fmt->priv_data, "rtpflags", "latm")) {
config = latm_context2config(fmt, p);
if (!config)
return NULL;
av_strlcatf(buff, size, "a=rtpmap:%d MP4A-LATM/%d/%d\r\n"
"a=fmtp:%d profile-level-id=%d;cpresent=0;config=%s\r\n",
payload_type, p->sample_rate, p->channels,
payload_type, latm_context2profilelevel(p), config);
} else {
if (p->extradata_size) {
config = extradata2config(fmt, p);
} else {
/* FIXME: maybe we can forge config information based on the
* codec parameters...
*/
av_log(fmt, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n");
return NULL;
}
if (!config) {
return NULL;
}
av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n"
"a=fmtp:%d profile-level-id=1;"
"mode=AAC-hbr;sizelength=13;indexlength=3;"
"indexdeltalength=3%s\r\n",
payload_type, p->sample_rate, p->channels,
payload_type, config);
}
break;
case AV_CODEC_ID_PCM_S16BE:
if (payload_type >= RTP_PT_PRIVATE)
av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n",
payload_type,
p->sample_rate, p->channels);
break;
case AV_CODEC_ID_PCM_MULAW:
if (payload_type >= RTP_PT_PRIVATE)
av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n",
payload_type,
p->sample_rate, p->channels);
break;
case AV_CODEC_ID_PCM_ALAW:
if (payload_type >= RTP_PT_PRIVATE)
av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n",
payload_type,
p->sample_rate, p->channels);
break;
case AV_CODEC_ID_AMR_NB:
av_strlcatf(buff, size, "a=rtpmap:%d AMR/%d/%d\r\n"
"a=fmtp:%d octet-align=1\r\n",
payload_type, p->sample_rate, p->channels,
payload_type);
break;
case AV_CODEC_ID_AMR_WB:
av_strlcatf(buff, size, "a=rtpmap:%d AMR-WB/%d/%d\r\n"
"a=fmtp:%d octet-align=1\r\n",
payload_type, p->sample_rate, p->channels,
payload_type);
break;
case AV_CODEC_ID_VORBIS:
if (p->extradata_size)
config = xiph_extradata2config(fmt, p);
else
av_log(fmt, AV_LOG_ERROR, "Vorbis configuration info missing\n");
if (!config)
return NULL;
av_strlcatf(buff, size, "a=rtpmap:%d vorbis/%d/%d\r\n"
"a=fmtp:%d configuration=%s\r\n",
payload_type, p->sample_rate, p->channels,
payload_type, config);
break;
case AV_CODEC_ID_THEORA: {
const char *pix_fmt;
switch (p->format) {
case AV_PIX_FMT_YUV420P:
pix_fmt = "YCbCr-4:2:0";
break;
case AV_PIX_FMT_YUV422P:
pix_fmt = "YCbCr-4:2:2";
break;
case AV_PIX_FMT_YUV444P:
pix_fmt = "YCbCr-4:4:4";
break;
default:
av_log(fmt, AV_LOG_ERROR, "Unsupported pixel format.\n");
return NULL;
}
if (p->extradata_size)
config = xiph_extradata2config(fmt, p);
else
av_log(fmt, AV_LOG_ERROR, "Theora configuation info missing\n");
if (!config)
return NULL;
av_strlcatf(buff, size, "a=rtpmap:%d theora/90000\r\n"
"a=fmtp:%d delivery-method=inline; "
"width=%d; height=%d; sampling=%s; "
"configuration=%s\r\n",
payload_type, payload_type,
p->width, p->height, pix_fmt, config);
break;
}
case AV_CODEC_ID_VP8:
av_strlcatf(buff, size, "a=rtpmap:%d VP8/90000\r\n",
payload_type);
break;
case AV_CODEC_ID_MJPEG:
if (payload_type >= RTP_PT_PRIVATE)
av_strlcatf(buff, size, "a=rtpmap:%d JPEG/90000\r\n",
payload_type);
break;
case AV_CODEC_ID_ADPCM_G722:
if (payload_type >= RTP_PT_PRIVATE)
av_strlcatf(buff, size, "a=rtpmap:%d G722/%d/%d\r\n",
payload_type,
8000, p->channels);
break;
case AV_CODEC_ID_ADPCM_G726: {
if (payload_type >= RTP_PT_PRIVATE)
av_strlcatf(buff, size, "a=rtpmap:%d G726-%d/%d\r\n",
payload_type,
p->bits_per_coded_sample*8,
p->sample_rate);
break;
}
case AV_CODEC_ID_ILBC:
av_strlcatf(buff, size, "a=rtpmap:%d iLBC/%d\r\n"
"a=fmtp:%d mode=%d\r\n",
payload_type, p->sample_rate,
payload_type, p->block_align == 38 ? 20 : 30);
break;
case AV_CODEC_ID_SPEEX:
av_strlcatf(buff, size, "a=rtpmap:%d speex/%d\r\n",
payload_type, p->sample_rate);
break;
case AV_CODEC_ID_OPUS:
/* The opus RTP draft says that all opus streams MUST be declared
as stereo, to avoid negotiation failures. The actual number of
channels can change on a packet-by-packet basis. The number of
channels a receiver prefers to receive or a sender plans to send
can be declared via fmtp parameters (both default to mono), but
receivers MUST be able to receive and process stereo packets. */
av_strlcatf(buff, size, "a=rtpmap:%d opus/48000/2\r\n",
payload_type);
if (p->channels == 2) {
av_strlcatf(buff, size, "a=fmtp:%d sprop-stereo=1\r\n",
payload_type);
}
break;
default:
/* Nothing special to do here... */
break;
}
av_free(config);
return buff;
}
void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx,
const char *dest_addr, const char *dest_type,
int port, int ttl, AVFormatContext *fmt)
{
AVCodecParameters *p = st->codecpar;
const char *type;
int payload_type;
payload_type = ff_rtp_get_payload_type(fmt, st->codecpar, idx);
switch (p->codec_type) {
case AVMEDIA_TYPE_VIDEO : type = "video" ; break;
case AVMEDIA_TYPE_AUDIO : type = "audio" ; break;
case AVMEDIA_TYPE_SUBTITLE: type = "text" ; break;
default : type = "application"; break;
}
av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type);
sdp_write_address(buff, size, dest_addr, dest_type, ttl);
if (p->bit_rate) {
av_strlcatf(buff, size, "b=AS:%d\r\n", p->bit_rate / 1000);
}
sdp_write_media_attributes(buff, size, p, payload_type, fmt);
}
int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)
{
AVDictionaryEntry *title = av_dict_get(ac[0]->metadata, "title", NULL, 0);
struct sdp_session_level s = { 0 };
int i, j, port, ttl, is_multicast, index = 0;
char dst[32], dst_type[5];
memset(buf, 0, size);
s.user = "-";
s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */
s.src_type = "IP4";
s.name = title ? title->value : "No Name";
port = 0;
ttl = 0;
if (n_files == 1) {
port = sdp_get_address(dst, sizeof(dst), &ttl, ac[0]->filename);
is_multicast = resolve_destination(dst, sizeof(dst), dst_type,
sizeof(dst_type));
if (!is_multicast)
ttl = 0;
if (dst[0]) {
s.dst_addr = dst;
s.dst_type = dst_type;
s.ttl = ttl;
if (!strcmp(dst_type, "IP6")) {
s.src_addr = "::1";
s.src_type = "IP6";
}
}
}
sdp_write_header(buf, size, &s);
dst[0] = 0;
for (i = 0; i < n_files; i++) {
if (n_files != 1) {
port = sdp_get_address(dst, sizeof(dst), &ttl, ac[i]->filename);
is_multicast = resolve_destination(dst, sizeof(dst), dst_type,
sizeof(dst_type));
if (!is_multicast)
ttl = 0;
}
for (j = 0; j < ac[i]->nb_streams; j++) {
ff_sdp_write_media(buf, size, ac[i]->streams[j], index++,
dst[0] ? dst : NULL, dst_type,
(port > 0) ? port + j * 2 : 0,
ttl, ac[i]);
if (port <= 0) {
av_strlcatf(buf, size,
"a=control:streamid=%d\r\n", i + j);
}
if (ac[i]->pb && ac[i]->pb->av_class) {
uint8_t *crypto_suite = NULL, *crypto_params = NULL;
av_opt_get(ac[i]->pb, "srtp_out_suite", AV_OPT_SEARCH_CHILDREN,
&crypto_suite);
av_opt_get(ac[i]->pb, "srtp_out_params", AV_OPT_SEARCH_CHILDREN,
&crypto_params);
if (crypto_suite && crypto_suite[0])
av_strlcatf(buf, size,
"a=crypto:1 %s inline:%s\r\n",
crypto_suite, crypto_params);
av_free(crypto_suite);
av_free(crypto_params);
}
}
}
return 0;
}
#else
int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)
{
return AVERROR(ENOSYS);
}
void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx,
const char *dest_addr, const char *dest_type,
int port, int ttl, AVFormatContext *fmt)
{
}
#endif