libavformat/rtpenc_chain.c

   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 "url.h"
  27 #include "libavutil/opt.h"
  28
  29 int ff_rtp_chain_mux_open(AVFormatContext **out, AVFormatContext *s,
  30                           AVStream *st, URLContext *handle, int packet_size,
  31                           int idx)
  32 {
  33     AVFormatContext *rtpctx = NULL;
  34     int ret;
  35     const 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 */
  57     rtpctx->interrupt_callback = s->interrupt_callback;
  58     /* Copy the max delay setting; the rtp muxer reads this. */
  59     rtpctx->max_delay = s->max_delay;
  60     /* Copy other stream parameters. */
  61     rtpctx->streams[0]->sample_aspect_ratio = st->sample_aspect_ratio;
  62     rtpctx->flags |= s->flags & AVFMT_FLAG_BITEXACT;
  63     rtpctx->strict_std_compliance = s->strict_std_compliance;
  64
  65     /* Get the payload type from the codec */
  66     if (st->id < RTP_PT_PRIVATE)
  67         rtpctx->streams[0]->id =
  68             ff_rtp_get_payload_type(s, st->codecpar, idx);
  69     else
  70         rtpctx->streams[0]->id = st->id;
  71
  72
  73     if (av_opt_get(s, "rtpflags", AV_OPT_SEARCH_CHILDREN, &rtpflags) >= 0)
  74         av_dict_set(&opts, "rtpflags", rtpflags, AV_DICT_DONT_STRDUP_VAL);
  75
  76     /* Set the synchronized start time. */
  77     rtpctx->start_time_realtime = s->start_time_realtime;
  78
  79     avcodec_parameters_copy(rtpctx->streams[0]->codecpar, st->codecpar);
  80     rtpctx->streams[0]->time_base = st->time_base;
  81
  82     if (handle) {
  83         ret = ffio_fdopen(&rtpctx->pb, handle);
  84         if (ret < 0)
  85             ffurl_close(handle);
  86     } else
  87         ret = ffio_open_dyn_packet_buf(&rtpctx->pb, packet_size);
  88     if (!ret)
  89         ret = avformat_write_header(rtpctx, &opts);
  90     av_dict_free(&opts);
  91
  92     if (ret) {
  93         if (handle && rtpctx->pb) {
  94             avio_closep(&rtpctx->pb);
  95         } else if (rtpctx->pb) {
  96             ffio_free_dyn_buf(&rtpctx->pb);
  97         }
  98         avformat_free_context(rtpctx);
  99         return ret;
 100     }
 101
 102     *out = rtpctx;
 103     return 0;
 104
 105 fail:
 106     avformat_free_context(rtpctx);
 107     if (handle)
 108         ffurl_close(handle);
 109     return ret;
 110 }