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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 "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  rtpctx->flags |= s->flags & AVFMT_FLAG_MP4A_LATM;
63 
64  /* Get the payload type from the codec */
65  if (st->id < RTP_PT_PRIVATE)
66  rtpctx->streams[0]->id =
67  ff_rtp_get_payload_type(s, st->codec, idx);
68  else
69  rtpctx->streams[0]->id = st->id;
70 
71 
72  if (av_opt_get(s, "rtpflags", AV_OPT_SEARCH_CHILDREN, &rtpflags) >= 0)
73  av_dict_set(&opts, "rtpflags", rtpflags, AV_DICT_DONT_STRDUP_VAL);
74 
75  /* Set the synchronized start time. */
77 
78  avcodec_copy_context(rtpctx->streams[0]->codec, st->codec);
79 
80  if (handle) {
81  ffio_fdopen(&rtpctx->pb, handle);
82  } else
83  ffio_open_dyn_packet_buf(&rtpctx->pb, packet_size);
84  ret = avformat_write_header(rtpctx, &opts);
85  av_dict_free(&opts);
86 
87  if (ret) {
88  if (handle) {
89  avio_close(rtpctx->pb);
90  } else {
91  uint8_t *ptr;
92  avio_close_dyn_buf(rtpctx->pb, &ptr);
93  av_free(ptr);
94  }
95  avformat_free_context(rtpctx);
96  return ret;
97  }
98 
99  *out = rtpctx;
100  return 0;
101 
102 fail:
103  av_free(rtpctx);
104  if (handle)
105  ffurl_close(handle);
106  return ret;
107 }