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
28int ff_rtp_chain_mux_open(AVFormatContext **out, AVFormatContext *s,
29                          AVStream *st, URLContext *handle, int packet_size,
30                          int idx)
31{
32    AVFormatContext *rtpctx = NULL;
33    int ret;
34    const AVOutputFormat *rtp_format = av_guess_format("rtp", NULL, NULL);
35    uint8_t *rtpflags;
36    AVDictionary *opts = NULL;
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 */
56    rtpctx->interrupt_callback = s->interrupt_callback;
57    /* Copy the max delay setting; the rtp muxer reads this. */
58    rtpctx->max_delay = s->max_delay;
59    /* Copy other stream parameters. */
60    rtpctx->streams[0]->sample_aspect_ratio = st->sample_aspect_ratio;
61    rtpctx->flags |= s->flags & AVFMT_FLAG_BITEXACT;
62    rtpctx->strict_std_compliance = s->strict_std_compliance;
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->codecpar, 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. */
76    rtpctx->start_time_realtime = s->start_time_realtime;
77
78    avcodec_parameters_copy(rtpctx->streams[0]->codecpar, st->codecpar);
79    rtpctx->streams[0]->time_base = st->time_base;
80
81    if (handle) {
82        ret = ffio_fdopen(&rtpctx->pb, handle);
83        if (ret < 0)
84            ffurl_close(handle);
85    } else
86        ret = ffio_open_dyn_packet_buf(&rtpctx->pb, packet_size);
87    if (!ret)
88        ret = avformat_write_header(rtpctx, &opts);
89    av_dict_free(&opts);
90
91    if (ret) {
92        if (handle && rtpctx->pb) {
93            avio_closep(&rtpctx->pb);
94        } else if (rtpctx->pb) {
95            ffio_free_dyn_buf(&rtpctx->pb);
96        }
97        avformat_free_context(rtpctx);
98        return ret;
99    }
100
101    *out = rtpctx;
102    return 0;
103
104fail:
105    avformat_free_context(rtpctx);
106    if (handle)
107        ffurl_close(handle);
108    return ret;
109}
110