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FFmpeg/libavformat/sdp.c
Martin Storsjö 51a269cd97 Make sure the destination address is written as an IP address in the SDP 
Patch by Martin Storsjo (martin AT martin DOT st)

Originally committed as revision 21163 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-01-12 10:56:43 +00:00

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/*
* copyright (c) 2007 Luca Abeni
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; 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 "avformat.h"
#include "internal.h"
#include "avc.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 *dst_addr; /**< destination IP address (can be multicast) */
const char *name; /**< session name (can be an empty string) */
};
static void sdp_write_address(char *buff, int size, const char *dest_addr, int ttl)
{
if (dest_addr) {
if (ttl > 0) {
av_strlcatf(buff, size, "c=IN IP4 %s/%d\r\n", dest_addr, ttl);
} else {
av_strlcatf(buff, size, "c=IN IP4 %s\r\n", 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 IP4 %s\r\n"
"s=%s\r\n",
s->sdp_version,
s->id, s->version, s->src_addr,
s->name);
sdp_write_address(buff, size, s->dst_addr, 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 void resolve_destination(char *dest_addr, int size)
{
struct addrinfo hints, *ai, *cur;
if (!dest_addr[0])
return;
/* Resolve the destination, since it must be written
* as a numeric IP address in the SDP. */
memset(&hints, 0, sizeof(hints));
/* We only support IPv4 addresses in the SDP at the moment. */
hints.ai_family = AF_INET;
if (getaddrinfo(dest_addr, NULL, &hints, &ai))
return;
for (cur = ai; cur; cur = cur->ai_next) {
if (cur->ai_family == AF_INET) {
getnameinfo(cur->ai_addr, cur->ai_addrlen, dest_addr, size,
NULL, 0, NI_NUMERICHOST);
break;
}
}
freeaddrinfo(ai);
}
#else
static void resolve_destination(char *dest_addr, int size)
{
}
#endif
static int sdp_get_address(char *dest_addr, int size, int *ttl, const char *url)
{
int port;
const char *p;
char proto[32];
url_split(proto, sizeof(proto), NULL, 0, dest_addr, size, &port, NULL, 0, url);
*ttl = 0;
if (strcmp(proto, "rtp")) {
/* 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];
int is_multicast = find_info_tag(buff, sizeof(buff), "multicast", p);
if (is_multicast) {
if (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(AVCodecContext *c)
{
char *psets, *p;
const uint8_t *r;
const char *pset_string = "; sprop-parameter-sets=";
if (c->extradata_size > MAX_EXTRADATA_SIZE) {
av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
return NULL;
}
psets = av_mallocz(MAX_PSET_SIZE);
if (psets == NULL) {
av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets.\n");
return NULL;
}
memcpy(psets, pset_string, strlen(pset_string));
p = psets + strlen(pset_string);
r = ff_avc_find_startcode(c->extradata, c->extradata + c->extradata_size);
while (r < c->extradata + c->extradata_size) {
const uint8_t *r1;
uint8_t nal_type;
while (!*(r++));
nal_type = *r & 0x1f;
r1 = ff_avc_find_startcode(r, c->extradata + c->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 (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) {
av_log(c, AV_LOG_ERROR, "Cannot Base64-encode %td %td!\n", MAX_PSET_SIZE - (p - psets), r1 - r);
av_free(psets);
return NULL;
}
p += strlen(p);
r = r1;
}
return psets;
}
static char *extradata2config(AVCodecContext *c)
{
char *config;
if (c->extradata_size > MAX_EXTRADATA_SIZE) {
av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
return NULL;
}
config = av_malloc(10 + c->extradata_size * 2);
if (config == NULL) {
av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
return NULL;
}
memcpy(config, "; config=", 9);
ff_data_to_hex(config + 9, c->extradata, c->extradata_size);
config[9 + c->extradata_size * 2] = 0;
return config;
}
static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type)
{
char *config = NULL;
switch (c->codec_id) {
case CODEC_ID_H264:
if (c->extradata_size) {
config = extradata2psets(c);
}
av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n"
"a=fmtp:%d packetization-mode=1%s\r\n",
payload_type,
payload_type, config ? config : "");
break;
case CODEC_ID_H263:
case CODEC_ID_H263P:
av_strlcatf(buff, size, "a=rtpmap:%d H263-2000/90000\r\n", payload_type);
break;
case CODEC_ID_MPEG4:
if (c->extradata_size) {
config = extradata2config(c);
}
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 CODEC_ID_AAC:
if (c->extradata_size) {
config = extradata2config(c);
} else {
/* FIXME: maybe we can forge config information based on the
* codec parameters...
*/
av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n");
return NULL;
}
if (config == NULL) {
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, c->sample_rate, c->channels,
payload_type, config);
break;
case CODEC_ID_PCM_S16BE:
if (payload_type >= RTP_PT_PRIVATE)
av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n",
payload_type,
c->sample_rate, c->channels);
break;
case CODEC_ID_PCM_MULAW:
if (payload_type >= RTP_PT_PRIVATE)
av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n",
payload_type,
c->sample_rate, c->channels);
break;
case CODEC_ID_PCM_ALAW:
if (payload_type >= RTP_PT_PRIVATE)
av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n",
payload_type,
c->sample_rate, c->channels);
break;
case 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, c->sample_rate, c->channels,
payload_type);
break;
case 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, c->sample_rate, c->channels,
payload_type);
break;
default:
/* Nothing special to do here... */
break;
}
av_free(config);
return buff;
}
static void sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, int port, int ttl)
{
const char *type;
int payload_type;
payload_type = ff_rtp_get_payload_type(c);
if (payload_type < 0) {
payload_type = RTP_PT_PRIVATE + (c->codec_type == CODEC_TYPE_AUDIO);
}
switch (c->codec_type) {
case CODEC_TYPE_VIDEO : type = "video" ; break;
case CODEC_TYPE_AUDIO : type = "audio" ; break;
case CODEC_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, ttl);
if (c->bit_rate) {
av_strlcatf(buff, size, "b=AS:%d\r\n", c->bit_rate / 1000);
}
sdp_write_media_attributes(buff, size, c, payload_type);
}
int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
{
AVMetadataTag *title = av_metadata_get(ac[0]->metadata, "title", NULL, 0);
struct sdp_session_level s;
int i, j, port, ttl;
char dst[32];
memset(buff, 0, size);
memset(&s, 0, sizeof(struct sdp_session_level));
s.user = "-";
s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */
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);
resolve_destination(dst, sizeof(dst));
if (dst[0]) {
s.dst_addr = dst;
s.ttl = ttl;
}
}
sdp_write_header(buff, 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);
resolve_destination(dst, sizeof(dst));
}
for (j = 0; j < ac[i]->nb_streams; j++) {
sdp_write_media(buff, size,
ac[i]->streams[j]->codec, dst[0] ? dst : NULL,
(port > 0) ? port + j * 2 : 0, ttl);
if (port <= 0) {
av_strlcatf(buff, size,
"a=control:streamid=%d\r\n", i + j);
}
}
}
return 0;
}
#else
int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
{
return AVERROR(ENOSYS);
}
#endif
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