rtsp: Factorize out code for opening a chained RTP muxer
[libav.git] / libavformat / rtpenc_chain.c
CommitLineData
a493f80a
MS
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 "rtpenc_chain.h"
24
25AVFormatContext *ff_rtp_chain_mux_open(AVFormatContext *s, AVStream *st,
26 URLContext *handle, int packet_size)
27{
28 AVFormatContext *rtpctx;
29 int ret;
30 AVOutputFormat *rtp_format = av_guess_format("rtp", NULL, NULL);
31
32 if (!rtp_format)
33 return NULL;
34
35 /* Allocate an AVFormatContext for each output stream */
36 rtpctx = avformat_alloc_context();
37 if (!rtpctx)
38 return NULL;
39
40 rtpctx->oformat = rtp_format;
41 if (!av_new_stream(rtpctx, 0)) {
42 av_free(rtpctx);
43 return NULL;
44 }
45 /* Copy the max delay setting; the rtp muxer reads this. */
46 rtpctx->max_delay = s->max_delay;
47 /* Copy other stream parameters. */
48 rtpctx->streams[0]->sample_aspect_ratio = st->sample_aspect_ratio;
49
50 /* Set the synchronized start time. */
51 rtpctx->start_time_realtime = s->start_time_realtime;
52
53 /* Remove the local codec, link to the original codec
54 * context instead, to give the rtp muxer access to
55 * codec parameters. */
56 av_free(rtpctx->streams[0]->codec);
57 rtpctx->streams[0]->codec = st->codec;
58
59 if (handle) {
60 url_fdopen(&rtpctx->pb, handle);
61 } else
62 url_open_dyn_packet_buf(&rtpctx->pb, packet_size);
63 ret = av_write_header(rtpctx);
64
65 if (ret) {
66 if (handle) {
67 url_fclose(rtpctx->pb);
68 } else {
69 uint8_t *ptr;
70 url_close_dyn_buf(rtpctx->pb, &ptr);
71 av_free(ptr);
72 }
73 av_free(rtpctx->streams[0]);
74 av_free(rtpctx);
75 return NULL;
76 }
77
78 /* Copy the RTP AVStream timebase back to the original AVStream */
79 st->time_base = rtpctx->streams[0]->time_base;
80 return rtpctx;
81}
82