FFmpeg: libavformat/rtpenc_mpegts.c Source File

FFmpeg
rtpenc_mpegts.c
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1 /*
2  * RTP/mpegts muxer
3  * Copyright (c) 2011 Martin Storsjo
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/mathematics.h"
23 #include "avformat.h"
24 #include "avio_internal.h"
25 
26  struct MuxChain {
27   AVFormatContext *mpegts_ctx;
28   AVFormatContext *rtp_ctx;
29 };
30 
31  static int rtp_mpegts_write_close(AVFormatContext *s)
32 {
33  struct MuxChain *chain = s->priv_data;
34 
35  if (chain->mpegts_ctx) {
36  av_write_trailer(chain->mpegts_ctx);
37  ffio_free_dyn_buf(&chain->mpegts_ctx->pb);
38  avformat_free_context(chain->mpegts_ctx);
39  }
40  if (chain->rtp_ctx) {
41  av_write_trailer(chain->rtp_ctx);
42  avformat_free_context(chain->rtp_ctx);
43  }
44  return 0;
45 }
46 
47  static int rtp_mpegts_write_header(AVFormatContext *s)
48 {
49  struct MuxChain *chain = s->priv_data;
50  AVFormatContext *mpegts_ctx = NULL, *rtp_ctx = NULL;
51  AVOutputFormat *mpegts_format = av_guess_format("mpegts", NULL, NULL);
52  AVOutputFormat *rtp_format = av_guess_format("rtp", NULL, NULL);
53  int i, ret = AVERROR(ENOMEM);
54  AVStream *st;
55 
56  if (!mpegts_format || !rtp_format)
57  return AVERROR(ENOSYS);
58  mpegts_ctx = avformat_alloc_context();
59  if (!mpegts_ctx)
60  return AVERROR(ENOMEM);
61  mpegts_ctx->oformat = mpegts_format;
62  mpegts_ctx->max_delay = s->max_delay;
63  for (i = 0; i < s->nb_streams; i++) {
64  AVStream* st = avformat_new_stream(mpegts_ctx, NULL);
65  if (!st)
66  goto fail;
67  st->time_base = s->streams[i]->time_base;
68  st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
69  avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar);
70  }
71  if ((ret = avio_open_dyn_buf(&mpegts_ctx->pb)) < 0)
72  goto fail;
73  if ((ret = avformat_write_header(mpegts_ctx, NULL)) < 0)
74  goto fail;
75  for (i = 0; i < s->nb_streams; i++)
76  s->streams[i]->time_base = mpegts_ctx->streams[i]->time_base;
77 
78  chain->mpegts_ctx = mpegts_ctx;
79  mpegts_ctx = NULL;
80 
81  rtp_ctx = avformat_alloc_context();
82  if (!rtp_ctx) {
83  ret = AVERROR(ENOMEM);
84  goto fail;
85  }
86  rtp_ctx->oformat = rtp_format;
87  st = avformat_new_stream(rtp_ctx, NULL);
88  st->time_base.num = 1;
89  st->time_base.den = 90000;
90  st->codecpar->codec_id = AV_CODEC_ID_MPEG2TS;
91  rtp_ctx->pb = s->pb;
92  if ((ret = avformat_write_header(rtp_ctx, NULL)) < 0)
93  goto fail;
94  chain->rtp_ctx = rtp_ctx;
95 
96  return 0;
97 
98 fail:
99  if (mpegts_ctx) {
100  ffio_free_dyn_buf(&mpegts_ctx->pb);
101  avformat_free_context(mpegts_ctx);
102  }
103  if (rtp_ctx)
104  avformat_free_context(rtp_ctx);
105  rtp_mpegts_write_close(s);
106  return ret;
107 }
108 
109  static int rtp_mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
110 {
111  struct MuxChain *chain = s->priv_data;
112  int ret = 0, size;
113  uint8_t *buf;
114  AVPacket local_pkt;
115 
116  if (!chain->mpegts_ctx->pb) {
117  if ((ret = avio_open_dyn_buf(&chain->mpegts_ctx->pb)) < 0)
118  return ret;
119  }
120  if ((ret = av_write_frame(chain->mpegts_ctx, pkt)) < 0)
121  return ret;
122  size = avio_close_dyn_buf(chain->mpegts_ctx->pb, &buf);
123  chain->mpegts_ctx->pb = NULL;
124  if (size == 0) {
125  av_free(buf);
126  return 0;
127  }
128  av_init_packet(&local_pkt);
129  local_pkt.data = buf;
130  local_pkt.size = size;
131  local_pkt.stream_index = 0;
132  if (pkt->pts != AV_NOPTS_VALUE)
133  local_pkt.pts = av_rescale_q(pkt->pts,
134  s->streams[pkt->stream_index]->time_base,
135  chain->rtp_ctx->streams[0]->time_base);
136  if (pkt->dts != AV_NOPTS_VALUE)
137  local_pkt.dts = av_rescale_q(pkt->dts,
138  s->streams[pkt->stream_index]->time_base,
139  chain->rtp_ctx->streams[0]->time_base);
140  ret = av_write_frame(chain->rtp_ctx, &local_pkt);
141  av_free(buf);
142 
143  return ret;
144 }
145 
146  AVOutputFormat ff_rtp_mpegts_muxer = {
147  .name = "rtp_mpegts",
148  .long_name = NULL_IF_CONFIG_SMALL("RTP/mpegts output format"),
149  .priv_data_size = sizeof(struct MuxChain),
150  .audio_codec = AV_CODEC_ID_AAC,
151  .video_codec = AV_CODEC_ID_MPEG4,
152  .write_header = rtp_mpegts_write_header,
153  .write_packet = rtp_mpegts_write_packet,
154  .write_trailer = rtp_mpegts_write_close,
155 };
ff_rtp_mpegts_muxer
AVOutputFormat ff_rtp_mpegts_muxer
Definition: rtpenc_mpegts.c:146
NULL
#define NULL
Definition: coverity.c:32
s
const char * s
Definition: avisynth_c.h:768
avio_close_dyn_buf
int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
Return the written size and a pointer to the buffer.
Definition: aviobuf.c:1280
av_write_frame
int av_write_frame(AVFormatContext *s, AVPacket *pkt)
Write a packet to an output media file.
Definition: mux.c:919
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3980
AVStream::sample_aspect_ratio
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:956
AVRational::num
int num
Numerator.
Definition: rational.h:59
AVPacket::size
int size
Definition: avcodec.h:1602
AV_CODEC_ID_MPEG4
Definition: avcodec.h:209
pkt
static AVPacket pkt
Definition: demuxing_decoding.c:54
avio_open_dyn_buf
int avio_open_dyn_buf(AVIOContext **s)
Open a write only memory stream.
Definition: aviobuf.c:1268
AVFormatContext
Format I/O context.
Definition: avformat.h:1338
uint8_t
uint8_t
Definition: audio_convert.c:194
rtp_mpegts_write_header
static int rtp_mpegts_write_header(AVFormatContext *s)
Definition: rtpenc_mpegts.c:47
AV_CODEC_ID_AAC
Definition: avcodec.h:518
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4193
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1406
avformat_alloc_context
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:132
avio_internal.h
AVPacket::data
uint8_t * data
Definition: avcodec.h:1601
size
ptrdiff_t size
Definition: opengl_enc.c:101
AVFormatContext::oformat
struct AVOutputFormat * oformat
The output container format.
Definition: avformat.h:1357
av_rescale_q
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
avcodec_parameters_copy
int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src)
Copy the contents of src to dst.
Definition: utils.c:4148
AVERROR
#define AVERROR(e)
Definition: error.h:43
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
rtp_mpegts_write_close
static int rtp_mpegts_write_close(AVFormatContext *s)
Definition: rtpenc_mpegts.c:31
fail
#define fail()
Definition: checkasm.h:83
AVFormatContext::nb_streams
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1394
avformat_write_header
av_warn_unused_result int avformat_write_header(AVFormatContext *s, AVDictionary **options)
Allocate the stream private data and write the stream header to an output media file.
Definition: mux.c:527
rtp_mpegts_write_packet
static int rtp_mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rtpenc_mpegts.c:109
AVOutputFormat::name
const char * name
Definition: avformat.h:524
av_guess_format
AVOutputFormat * av_guess_format(const char *short_name, const char *filename, const char *mime_type)
Return the output format in the list of registered output formats which best matches the provided par...
Definition: format.c:98
ffio_free_dyn_buf
void ffio_free_dyn_buf(AVIOContext **s)
Free a dynamic buffer.
Definition: aviobuf.c:1308
AVStream
Stream structure.
Definition: avformat.h:889
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1380
buf
void * buf
Definition: avisynth_c.h:690
avformat_free_context
void avformat_free_context(AVFormatContext *s)
Free an AVFormatContext and all its streams.
Definition: utils.c:4129
avformat.h
Main libavformat public API header.
av_init_packet
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
Definition: avpacket.c:33
AVRational::den
int den
Denominator.
Definition: rational.h:60
AV_CODEC_ID_MPEG2TS
FAKE codec to indicate a raw MPEG-2 TS stream (only used by libavformat)
Definition: avcodec.h:647
av_free
#define av_free(p)
Definition: tableprint_vlc.h:34
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1366
AVPacket::dts
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1600
av_write_trailer
int av_write_trailer(AVFormatContext *s)
Write the stream trailer to an output media file and free the file private data.
Definition: mux.c:1287
MuxChain::mpegts_ctx
AVFormatContext * mpegts_ctx
Definition: rtpenc_mpegts.c:27
AVStream::codecpar
AVCodecParameters * codecpar
Definition: avformat.h:1241
AVPacket::stream_index
int stream_index
Definition: avcodec.h:1603
AVStream::time_base
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:926
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1578
MuxChain::rtp_ctx
AVFormatContext * rtp_ctx
Definition: rtpenc_mpegts.c:28
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1594
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:242
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