FFmpeg  4.0
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 {
29 };
30 
32 {
33  struct MuxChain *chain = s->priv_data;
34 
35  if (chain->mpegts_ctx) {
39  }
40  if (chain->rtp_ctx) {
41  av_write_trailer(chain->rtp_ctx);
43  }
44  return 0;
45 }
46 
48 {
49  struct MuxChain *chain = s->priv_data;
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;
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  if (!st) {
89  ret = AVERROR(ENOMEM);
90  goto fail;
91  }
92  st->time_base.num = 1;
93  st->time_base.den = 90000;
95  rtp_ctx->pb = s->pb;
96  if ((ret = avformat_write_header(rtp_ctx, NULL)) < 0)
97  goto fail;
98  chain->rtp_ctx = rtp_ctx;
99 
100  return 0;
101 
102 fail:
103  if (mpegts_ctx) {
104  ffio_free_dyn_buf(&mpegts_ctx->pb);
105  avformat_free_context(mpegts_ctx);
106  }
107  if (rtp_ctx)
108  avformat_free_context(rtp_ctx);
110  return ret;
111 }
112 
114 {
115  struct MuxChain *chain = s->priv_data;
116  int ret = 0, size;
117  uint8_t *buf;
118  AVPacket local_pkt;
119 
120  if (!chain->mpegts_ctx->pb) {
121  if ((ret = avio_open_dyn_buf(&chain->mpegts_ctx->pb)) < 0)
122  return ret;
123  }
124  if ((ret = av_write_frame(chain->mpegts_ctx, pkt)) < 0)
125  return ret;
126  size = avio_close_dyn_buf(chain->mpegts_ctx->pb, &buf);
127  chain->mpegts_ctx->pb = NULL;
128  if (size == 0) {
129  av_free(buf);
130  return 0;
131  }
132  av_init_packet(&local_pkt);
133  local_pkt.data = buf;
134  local_pkt.size = size;
135  local_pkt.stream_index = 0;
136  if (pkt->pts != AV_NOPTS_VALUE)
137  local_pkt.pts = av_rescale_q(pkt->pts,
138  s->streams[pkt->stream_index]->time_base,
139  chain->rtp_ctx->streams[0]->time_base);
140  if (pkt->dts != AV_NOPTS_VALUE)
141  local_pkt.dts = av_rescale_q(pkt->dts,
142  s->streams[pkt->stream_index]->time_base,
143  chain->rtp_ctx->streams[0]->time_base);
144  ret = av_write_frame(chain->rtp_ctx, &local_pkt);
145  av_free(buf);
146 
147  return ret;
148 }
149 
151  .name = "rtp_mpegts",
152  .long_name = NULL_IF_CONFIG_SMALL("RTP/mpegts output format"),
153  .priv_data_size = sizeof(struct MuxChain),
154  .audio_codec = AV_CODEC_ID_AAC,
155  .video_codec = AV_CODEC_ID_MPEG4,
156  .write_header = rtp_mpegts_write_header,
157  .write_packet = rtp_mpegts_write_packet,
158  .write_trailer = rtp_mpegts_write_close,
159 };
AVOutputFormat ff_rtp_mpegts_muxer
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
int size
int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
Return the written size and a pointer to the buffer.
Definition: aviobuf.c:1420
int av_write_frame(AVFormatContext *s, AVPacket *pkt)
Write a packet to an output media file.
Definition: mux.c:878
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3884
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:935
int num
Numerator.
Definition: rational.h:59
int size
Definition: avcodec.h:1431
static AVPacket pkt
int avio_open_dyn_buf(AVIOContext **s)
Open a write only memory stream.
Definition: aviobuf.c:1391
Format I/O context.
Definition: avformat.h:1342
uint8_t
static int rtp_mpegts_write_header(AVFormatContext *s)
Definition: rtpenc_mpegts.c:47
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4441
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1410
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:144
uint8_t * data
Definition: avcodec.h:1430
struct AVOutputFormat * oformat
The output container format.
Definition: avformat.h:1361
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
int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src)
Copy the contents of src to dst.
Definition: utils.c:2003
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
static int rtp_mpegts_write_close(AVFormatContext *s)
Definition: rtpenc_mpegts.c:31
#define fail()
Definition: checkasm.h:116
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1398
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:508
static int rtp_mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
const char * name
Definition: avformat.h:507
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:51
void ffio_free_dyn_buf(AVIOContext **s)
Free a dynamic buffer.
Definition: aviobuf.c:1450
Stream structure.
Definition: avformat.h:873
AVIOContext * pb
I/O context.
Definition: avformat.h:1384
void * buf
Definition: avisynth_c.h:690
void avformat_free_context(AVFormatContext *s)
Free an AVFormatContext and all its streams.
Definition: utils.c:4375
Main libavformat public API header.
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
Definition: avpacket.c:33
int den
Denominator.
Definition: rational.h:60
FAKE codec to indicate a raw MPEG-2 TS stream (only used by libavformat)
Definition: avcodec.h:686
#define av_free(p)
void * priv_data
Format private data.
Definition: avformat.h:1370
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1429
int av_write_trailer(AVFormatContext *s)
Write the stream trailer to an output media file and free the file private data.
Definition: mux.c:1247
AVFormatContext * mpegts_ctx
Definition: rtpenc_mpegts.c:27
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1020
int stream_index
Definition: avcodec.h:1432
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:902
This structure stores compressed data.
Definition: avcodec.h:1407
AVFormatContext * rtp_ctx
Definition: rtpenc_mpegts.c:28
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1423
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248