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FFmpeg/libavformat/sdp.c
Martin Storsjö b762494438 sdp: Simplify parsing/conversion of H264 extradata 
By using ff_avc_write_annexb_extradata instead of the h264_mp4toannexb
BSF, the code for doing the conversion itself is kept much shorter,
there's less state to restore at the end, we don't risk leaving the
AVCodecContext in an inconsistent state if returning early due to
errors, etc.

Also add a missing free if the base64 encoding fails.

Signed-off-by: Martin Storsjö <martin@martin.st>
2014-10-06 23:29:58 +03:00

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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 "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(AVCodecContext *c)
{
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 = c->extradata;
int extradata_size = c->extradata_size;
uint8_t *tmpbuf = NULL;
const uint8_t *sps = NULL, *sps_end;
if (c->extradata_size > MAX_EXTRADATA_SIZE) {
av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
return NULL;
}
if (c->extradata[0] == 1) {
if (ff_avc_write_annexb_extradata(c->extradata, &extradata,
&extradata_size))
return NULL;
tmpbuf = extradata;
}
psets = av_mallocz(MAX_PSET_SIZE);
if (!psets) {
av_log(c, 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(c, 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 *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) {
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, 0);
config[9 + c->extradata_size * 2] = 0;
return config;
}
static char *xiph_extradata2config(AVCodecContext *c)
{
char *config, *encoded_config;
uint8_t *header_start[3];
int headers_len, header_len[3], config_len;
int first_header_size;
switch (c->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(c, AV_LOG_ERROR, "Unsupported Xiph codec ID\n");
return NULL;
}
if (avpriv_split_xiph_headers(c->extradata, c->extradata_size,
first_header_size, header_start,
header_len) < 0) {
av_log(c, 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(c, AV_LOG_ERROR,
"Not enough memory for configuration string\n");
return NULL;
}
static int latm_context2profilelevel(AVCodecContext *c)
{
/* 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 (c->sample_rate <= 24000) {
if (c->channels <= 2)
profile_level = 0x28; // AAC Profile, Level 1
} else if (c->sample_rate <= 48000) {
if (c->channels <= 2) {
profile_level = 0x29; // AAC Profile, Level 2
} else if (c->channels <= 5) {
profile_level = 0x2A; // AAC Profile, Level 4
}
} else if (c->sample_rate <= 96000) {
if (c->channels <= 5) {
profile_level = 0x2B; // AAC Profile, Level 5
}
}
return profile_level;
}
static char *latm_context2config(AVCodecContext *c)
{
/* 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] == c->sample_rate)
break;
if (rate_index == 16) {
av_log(c, 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] = c->channels << 4;
config_byte[4] = 0x3f;
config_byte[5] = 0xc0;
config = av_malloc(6*2+1);
if (!config) {
av_log(c, 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, AVCodecContext *c, int payload_type, AVFormatContext *fmt)
{
char *config = NULL;
switch (c->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 (c->extradata_size) {
config = extradata2psets(c);
}
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_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") ||
c->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, c->width, c->height);
break;
case AV_CODEC_ID_HEVC:
if (c->extradata_size)
av_log(NULL, AV_LOG_WARNING, "HEVC extradata not currently "
"passed properly through SDP\n");
av_strlcatf(buff, size, "a=rtpmap:%d H265/90000\r\n", payload_type);
break;
case AV_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 AV_CODEC_ID_AAC:
if (fmt && fmt->oformat->priv_class &&
av_opt_flag_is_set(fmt->priv_data, "rtpflags", "latm")) {
config = latm_context2config(c);
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, c->sample_rate, c->channels,
payload_type, latm_context2profilelevel(c), config);
} else {
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) {
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 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,
c->sample_rate, c->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,
c->sample_rate, c->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,
c->sample_rate, c->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, c->sample_rate, c->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, c->sample_rate, c->channels,
payload_type);
break;
case AV_CODEC_ID_VORBIS:
if (c->extradata_size)
config = xiph_extradata2config(c);
else
av_log(c, 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, c->sample_rate, c->channels,
payload_type, config);
break;
case AV_CODEC_ID_THEORA: {
const char *pix_fmt;
switch (c->pix_fmt) {
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(c, AV_LOG_ERROR, "Unsupported pixel format.\n");
return NULL;
}
if (c->extradata_size)
config = xiph_extradata2config(c);
else
av_log(c, 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,
c->width, c->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, c->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,
c->bits_per_coded_sample*8,
c->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, c->sample_rate,
payload_type, c->block_align == 38 ? 20 : 30);
break;
case AV_CODEC_ID_SPEEX:
av_strlcatf(buff, size, "a=rtpmap:%d speex/%d\r\n",
payload_type, c->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 (c->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)
{
AVCodecContext *c = st->codec;
const char *type;
int payload_type;
payload_type = ff_rtp_get_payload_type(fmt, c, idx);
switch (c->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 (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, 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
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