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rtpenc: MP4A-LATM payload support

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This is enabled with an AVOption on the RTP muxer. The SDP
generator looks for a latm flag in the rtpflags field.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Juan Carlos Rodriguez
2011-05-18 15:00:03 +03:00
committed by Martin Storsjö
parent cb7c11cc9e
commit 0832122880
7 changed files with 167 additions and 3 deletions
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2
libavcodec/Makefile
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@@ -545,7 +545,7 @@ OBJS-$(CONFIG_NUT_MUXER) += mpegaudiodata.o
OBJS-$(CONFIG_OGG_DEMUXER) += flacdec.o flacdata.o flac.o \
dirac.o mpeg12data.o
OBJS-$(CONFIG_OGG_MUXER) += xiph.o flacdec.o flacdata.o flac.o
OBJS-$(CONFIG_RTP_MUXER) += mpegvideo.o xiph.o
OBJS-$(CONFIG_RTP_MUXER) += mpeg4audio.o mpegvideo.o xiph.o
OBJS-$(CONFIG_SPDIF_DEMUXER) += aacadtsdec.o mpeg4audio.o
OBJS-$(CONFIG_WEBM_MUXER) += xiph.o mpeg4audio.o \
flacdec.o flacdata.o flac.o \

1
libavformat/Makefile
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@@ -228,6 +228,7 @@ OBJS-$(CONFIG_RSO_MUXER) += rsoenc.o rso.o
OBJS-$(CONFIG_RPL_DEMUXER) += rpl.o
OBJS-$(CONFIG_RTP_MUXER) += rtp.o \
rtpenc_aac.o \
rtpenc_latm.o \
rtpenc_amr.o \
rtpenc_h263.o \
rtpenc_mpv.o \

20
libavformat/rtpenc.c
View File

@@ -23,11 +23,25 @@
#include "mpegts.h"
#include "internal.h"
#include "libavutil/random_seed.h"
#include "libavutil/opt.h"
#include "rtpenc.h"
//#define DEBUG
static const AVOption options[] = {
{ "rtpflags", "RTP muxer flags", offsetof(RTPMuxContext, flags), FF_OPT_TYPE_FLAGS, {.dbl = 0}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "rtpflags" },
{ "latm", "Use MP4A-LATM packetization instead of MPEG4-GENERIC for AAC", 0, FF_OPT_TYPE_CONST, {.dbl = FF_RTP_FLAG_MP4A_LATM}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "rtpflags" },
{ NULL },
};
static const AVClass rtp_muxer_class = {
.class_name = "RTP muxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
#define RTCP_SR_SIZE 28
static int is_supported(enum CodecID id)
@@ -404,7 +418,10 @@ static int rtp_write_packet(AVFormatContext *s1, AVPacket *pkt)
ff_rtp_send_mpegvideo(s1, pkt->data, size);
break;
case CODEC_ID_AAC:
ff_rtp_send_aac(s1, pkt->data, size);
if (s->flags & FF_RTP_FLAG_MP4A_LATM)
ff_rtp_send_latm(s1, pkt->data, size);
else
ff_rtp_send_aac(s1, pkt->data, size);
break;
case CODEC_ID_AMR_NB:
case CODEC_ID_AMR_WB:
@@ -455,4 +472,5 @@ AVOutputFormat ff_rtp_muxer = {
rtp_write_header,
rtp_write_packet,
rtp_write_trailer,
.priv_class = &rtp_muxer_class,
};

6
libavformat/rtpenc.h
View File

@@ -25,6 +25,7 @@
#include "rtp.h"
struct RTPMuxContext {
const AVClass *av_class;
AVFormatContext *ic;
AVStream *st;
int payload_type;
@@ -56,15 +57,20 @@ struct RTPMuxContext {
* (1, 2 or 4)
*/
int nal_length_size;
int flags;
};
typedef struct RTPMuxContext RTPMuxContext;
#define FF_RTP_FLAG_MP4A_LATM 1
void ff_rtp_send_data(AVFormatContext *s1, const uint8_t *buf1, int len, int m);
void ff_rtp_send_h264(AVFormatContext *s1, const uint8_t *buf1, int size);
void ff_rtp_send_h263(AVFormatContext *s1, const uint8_t *buf1, int size);
void ff_rtp_send_aac(AVFormatContext *s1, const uint8_t *buff, int size);
void ff_rtp_send_latm(AVFormatContext *s1, const uint8_t *buff, int size);
void ff_rtp_send_amr(AVFormatContext *s1, const uint8_t *buff, int size);
void ff_rtp_send_mpegvideo(AVFormatContext *s1, const uint8_t *buf1, int size);
void ff_rtp_send_xiph(AVFormatContext *s1, const uint8_t *buff, int size);

61
libavformat/rtpenc_latm.c Normal file
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@@ -0,0 +1,61 @@
/*
* RTP Packetization of MPEG-4 Audio (RFC 3016)
* Copyright (c) 2011 Juan Carlos Rodriguez <ing.juancarlosrodriguez@hotmail.com>
*
* 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.
*
* 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 "avformat.h"
#include "rtpenc.h"
void ff_rtp_send_latm(AVFormatContext *s1, const uint8_t *buff, int size)
{
/* MP4A-LATM
* The RTP payload format specification is described in RFC 3016
* The encoding specifications are provided in ISO/IEC 14496-3 */
RTPMuxContext *s = s1->priv_data;
int header_size;
int offset = 0;
int len = 0;
/* skip ADTS header, if present */
if ((s1->streams[0]->codec->extradata_size) == 0) {
size -= 7;
buff += 7;
}
/* PayloadLengthInfo() */
header_size = size/0xFF + 1;
memset(s->buf, 0xFF, header_size - 1);
s->buf[header_size - 1] = size % 0xFF;
s->timestamp = s->cur_timestamp;
/* PayloadMux() */
while (size > 0) {
len = FFMIN(size, s->max_payload_size - (!offset ? header_size : 0));
size -= len;
if (!offset) {
memcpy(s->buf + header_size, buff, len);
ff_rtp_send_data(s1, s->buf, header_size + len, !size);
} else {
ff_rtp_send_data(s1, buff + offset, len, !size);
}
offset += len;
}
}

78
libavformat/sdp.c
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@@ -23,7 +23,9 @@
#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"
@@ -300,6 +302,71 @@ xiph_fail:
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 (ff_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;
@@ -335,6 +402,16 @@ static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c,
payload_type, config ? config : "");
break;
case 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 {
@@ -353,6 +430,7 @@ static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c,
"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)

2
libavformat/version.h
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@@ -25,7 +25,7 @@
#define LIBAVFORMAT_VERSION_MAJOR 53
#define LIBAVFORMAT_VERSION_MINOR 1
#define LIBAVFORMAT_VERSION_MICRO 0
#define LIBAVFORMAT_VERSION_MICRO 1
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
LIBAVFORMAT_VERSION_MINOR, \