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 Libav.
6  *
7  * Libav 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  * Libav 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 Libav; 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 "avio_internal.h"
26 #include "rtp.h"
27 #include "libavutil/opt.h"
28 
30  AVStream *st, URLContext *handle, int packet_size,
31  int idx)
32 {
33  AVFormatContext *rtpctx = NULL;
34  int ret;
35  AVOutputFormat *rtp_format = av_guess_format("rtp", NULL, NULL);
36  uint8_t *rtpflags;
37  AVDictionary *opts = NULL;
38 
39  if (!rtp_format) {
40  ret = AVERROR(ENOSYS);
41  goto fail;
42  }
43 
44  /* Allocate an AVFormatContext for each output stream */
45  rtpctx = avformat_alloc_context();
46  if (!rtpctx) {
47  ret = AVERROR(ENOMEM);
48  goto fail;
49  }
50 
51  rtpctx->oformat = rtp_format;
52  if (!avformat_new_stream(rtpctx, NULL)) {
53  ret = AVERROR(ENOMEM);
54  goto fail;
55  }
56  /* Pass the interrupt callback on */
58  /* Copy the max delay setting; the rtp muxer reads this. */
59  rtpctx->max_delay = s->max_delay;
60  /* Copy other stream parameters. */
62  /* Get the payload type from the codec */
63  if (st->id < RTP_PT_PRIVATE)
64  rtpctx->streams[0]->id =
65  ff_rtp_get_payload_type(s, st->codec, idx);
66  else
67  rtpctx->streams[0]->id = st->id;
68 
69  if (av_opt_get(s, "rtpflags", AV_OPT_SEARCH_CHILDREN, &rtpflags) >= 0)
70  av_dict_set(&opts, "rtpflags", rtpflags, AV_DICT_DONT_STRDUP_VAL);
71 
72  /* Set the synchronized start time. */
74 
75  avcodec_copy_context(rtpctx->streams[0]->codec, st->codec);
76 
77  if (handle) {
78  ffio_fdopen(&rtpctx->pb, handle);
79  } else
80  ffio_open_dyn_packet_buf(&rtpctx->pb, packet_size);
81  ret = avformat_write_header(rtpctx, &opts);
82  av_dict_free(&opts);
83 
84  if (ret) {
85  if (handle) {
86  avio_close(rtpctx->pb);
87  } else {
88  uint8_t *ptr;
89  avio_close_dyn_buf(rtpctx->pb, &ptr);
90  av_free(ptr);
91  }
92  avformat_free_context(rtpctx);
93  return ret;
94  }
95 
96  *out = rtpctx;
97  return 0;
98 
99 fail:
100  av_free(rtpctx);
101  if (handle)
102  ffurl_close(handle);
103  return ret;
104 }
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:981
AVIOInterruptCB interrupt_callback
Custom interrupt callbacks for the I/O layer.
Definition: avformat.h:1005
int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
Return the written size and a pointer to the buffer.
Definition: aviobuf.c:945
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:295
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:697
int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)
Copy the settings of the source AVCodecContext into the destination AVCodecContext.
Definition: options.c:140
Format I/O context.
Definition: avformat.h:828
#define RTP_PT_PRIVATE
Definition: rtp.h:76
uint8_t
AVOptions.
int id
Format-specific stream ID.
Definition: avformat.h:629
AVStream ** streams
Definition: avformat.h:876
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:97
struct AVOutputFormat * oformat
Definition: avformat.h:842
int ff_rtp_get_payload_type(AVFormatContext *fmt, AVCodecContext *codec, int idx)
Return the payload type for a given stream used in the given format context.
Definition: rtp.c:93
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:139
int avio_close(AVIOContext *s)
Close the resource accessed by the AVIOContext s and free it.
Definition: aviobuf.c:782
void av_dict_free(AVDictionary **pm)
Free all the memory allocated for an AVDictionary struct and all keys and values. ...
Definition: dict.c:113
AVStream * avformat_new_stream(AVFormatContext *s, AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2736
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:641
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:938
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: utils.c:151
Stream structure.
Definition: avformat.h:622
NULL
Definition: eval.c:52
AVStream * st
Definition: rtpenc.h:30
AVIOContext * pb
I/O context.
Definition: avformat.h:861
Definition: url.h:41
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:63
void avformat_free_context(AVFormatContext *s)
Free an AVFormatContext and all its streams.
Definition: utils.c:2662
int ffurl_close(URLContext *h)
Close the resource accessed by the URLContext h, and free the memory used by it.
Definition: avio.c:286
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:29
int av_opt_get(void *obj, const char *name, int search_flags, uint8_t **out_val)
Definition: opt.c:306
int ffio_fdopen(AVIOContext **s, URLContext *h)
Create and initialize a AVIOContext for accessing the resource referenced by the URLContext h...
Definition: aviobuf.c:661