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rtpenc_chain.c
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1 /*
2  * RTP muxer chaining code
3  * Copyright (c) 2010 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 "avformat.h"
23 #include "avio_internal.h"
24 #include "rtpenc_chain.h"
25 #include "rtp.h"
26 #include "libavutil/opt.h"
27 
29  AVStream *st, URLContext *handle, int packet_size,
30  int idx)
31 {
32  AVFormatContext *rtpctx = NULL;
33  int ret;
34  AVOutputFormat *rtp_format = av_guess_format("rtp", NULL, NULL);
35  uint8_t *rtpflags;
37 
38  if (!rtp_format) {
39  ret = AVERROR(ENOSYS);
40  goto fail;
41  }
42 
43  /* Allocate an AVFormatContext for each output stream */
44  rtpctx = avformat_alloc_context();
45  if (!rtpctx) {
46  ret = AVERROR(ENOMEM);
47  goto fail;
48  }
49 
50  rtpctx->oformat = rtp_format;
51  if (!avformat_new_stream(rtpctx, NULL)) {
52  ret = AVERROR(ENOMEM);
53  goto fail;
54  }
55  /* Pass the interrupt callback on */
57  /* Copy the max delay setting; the rtp muxer reads this. */
58  rtpctx->max_delay = s->max_delay;
59  /* Copy other stream parameters. */
62 
63  /* Get the payload type from the codec */
64  if (st->id < RTP_PT_PRIVATE)
65  rtpctx->streams[0]->id =
66  ff_rtp_get_payload_type(s, st->codecpar, idx);
67  else
68  rtpctx->streams[0]->id = st->id;
69 
70 
71  if (av_opt_get(s, "rtpflags", AV_OPT_SEARCH_CHILDREN, &rtpflags) >= 0)
72  av_dict_set(&opts, "rtpflags", rtpflags, AV_DICT_DONT_STRDUP_VAL);
73 
74  /* Set the synchronized start time. */
76 
78  rtpctx->streams[0]->time_base = st->time_base;
79 
80  if (handle) {
81  ret = ffio_fdopen(&rtpctx->pb, handle);
82  if (ret < 0)
83  ffurl_close(handle);
84  } else
85  ret = ffio_open_dyn_packet_buf(&rtpctx->pb, packet_size);
86  if (!ret)
87  ret = avformat_write_header(rtpctx, &opts);
88  av_dict_free(&opts);
89 
90  if (ret) {
91  if (handle && rtpctx->pb) {
92  avio_closep(&rtpctx->pb);
93  } else if (rtpctx->pb) {
94  ffio_free_dyn_buf(&rtpctx->pb);
95  }
96  avformat_free_context(rtpctx);
97  return ret;
98  }
99 
100  *out = rtpctx;
101  return 0;
102 
103 fail:
104  av_free(rtpctx);
105  if (handle)
106  ffurl_close(handle);
107  return ret;
108 }
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
int64_t start_time_realtime
Start time of the stream in real world time, in microseconds since the Unix epoch (00:00 1st January ...
Definition: avformat.h:1546
AVIOInterruptCB interrupt_callback
Custom interrupt callbacks for the I/O layer.
Definition: avformat.h:1571
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:943
Format I/O context.
Definition: avformat.h:1319
#define RTP_PT_PRIVATE
Definition: rtp.h:77
uint8_t
AVOptions.
int id
Format-specific stream ID.
Definition: avformat.h:883
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4043
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1387
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:132
int flags
Flags modifying the (de)muxer behaviour.
Definition: avformat.h:1430
#define AVFMT_FLAG_BITEXACT
When muxing, try to avoid writing any random/volatile data to the output.
Definition: avformat.h:1447
struct AVOutputFormat * oformat
The output container format.
Definition: avformat.h:1338
int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src)
Copy the contents of src to dst.
Definition: utils.c:4052
#define AVERROR(e)
Definition: error.h:43
void av_dict_free(AVDictionary **pm)
Free all the memory allocated for an AVDictionary struct and all keys and values. ...
Definition: dict.c:202
#define fail()
Definition: checkasm.h:81
#define AVFMT_FLAG_MP4A_LATM
Enable RTP MP4A-LATM payload.
Definition: avformat.h:1448
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:476
#define AV_OPT_SEARCH_CHILDREN
Search in possible children of the given object first.
Definition: opt.h:556
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that's been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:76
int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
Open a write only packetized memory stream with a maximum packet size of 'max_packet_size'.
Definition: aviobuf.c:1217
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:94
void ffio_free_dyn_buf(AVIOContext **s)
Free a dynamic buffer.
Definition: aviobuf.c:1252
FILE * out
Definition: movenc-test.c:54
Stream structure.
Definition: avformat.h:876
AVStream * st
Definition: rtpenc.h:30
AVIOContext * pb
I/O context.
Definition: avformat.h:1361
Definition: url.h:38
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:69
void avformat_free_context(AVFormatContext *s)
Free an AVFormatContext and all its streams.
Definition: utils.c:3979
int ffurl_close(URLContext *h)
Definition: avio.c:467
Main libavformat public API header.
int ff_rtp_chain_mux_open(AVFormatContext **out, AVFormatContext *s, AVStream *st, URLContext *handle, int packet_size, int idx)
Definition: rtpenc_chain.c:28
int av_opt_get(void *obj, const char *name, int search_flags, uint8_t **out_val)
Definition: opt.c:727
#define av_free(p)
int ff_rtp_get_payload_type(AVFormatContext *fmt, AVCodecParameters *par, int idx)
Return the payload type for a given stream used in the given format context.
Definition: rtp.c:90
AVDictionary * opts
Definition: movenc-test.c:50
int ffio_fdopen(AVIOContext **s, URLContext *h)
Create and initialize a AVIOContext for accessing the resource referenced by the URLContext h...
Definition: aviobuf.c:823
AVCodecParameters * codecpar
Definition: avformat.h:1006
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:913
int avio_closep(AVIOContext **s)
Close the resource accessed by the AVIOContext *s, free it and set the pointer pointing to it to NULL...
Definition: aviobuf.c:1038