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 "libavutil/opt.h"
27 
29  URLContext *handle, int packet_size)
30 {
31  AVFormatContext *rtpctx;
32  int ret;
33  AVOutputFormat *rtp_format = av_guess_format("rtp", NULL, NULL);
34  uint8_t *rtpflags;
35  AVDictionary *opts = NULL;
36 
37  if (!rtp_format)
38  return NULL;
39 
40  /* Allocate an AVFormatContext for each output stream */
41  rtpctx = avformat_alloc_context();
42  if (!rtpctx)
43  return NULL;
44 
45  rtpctx->oformat = rtp_format;
46  if (!avformat_new_stream(rtpctx, NULL)) {
47  av_free(rtpctx);
48  return NULL;
49  }
50  /* Pass the interrupt callback on */
52  /* Copy the max delay setting; the rtp muxer reads this. */
53  rtpctx->max_delay = s->max_delay;
54  /* Copy other stream parameters. */
56 
57  if (av_opt_get(s, "rtpflags", AV_OPT_SEARCH_CHILDREN, &rtpflags) >= 0)
58  av_dict_set(&opts, "rtpflags", rtpflags, AV_DICT_DONT_STRDUP_VAL);
59 
60  /* Set the synchronized start time. */
62 
63  avcodec_copy_context(rtpctx->streams[0]->codec, st->codec);
64 
65  if (handle) {
66  ffio_fdopen(&rtpctx->pb, handle);
67  } else
68  ffio_open_dyn_packet_buf(&rtpctx->pb, packet_size);
69  ret = avformat_write_header(rtpctx, &opts);
70  av_dict_free(&opts);
71 
72  if (ret) {
73  if (handle) {
74  avio_close(rtpctx->pb);
75  } else {
76  uint8_t *ptr;
77  avio_close_dyn_buf(rtpctx->pb, &ptr);
78  av_free(ptr);
79  }
80  avformat_free_context(rtpctx);
81  return NULL;
82  }
83 
84  return rtpctx;
85 }
86