libavformat/rtpenc_chain.c

   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
  28 AVFormatContext *ff_rtp_chain_mux_open(AVFormatContext *s, AVStream *st,
  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     /* Copy the max delay setting; the rtp muxer reads this. */
  51     rtpctx->max_delay = s->max_delay;
  52     /* Copy other stream parameters. */
  53     rtpctx->streams[0]->sample_aspect_ratio = st->sample_aspect_ratio;
  54
  55     if (av_opt_get(s, "rtpflags", AV_OPT_SEARCH_CHILDREN, &rtpflags) >= 0)
  56         av_dict_set(&opts, "rtpflags", rtpflags, AV_DICT_DONT_STRDUP_VAL);
  57
  58     /* Set the synchronized start time. */
  59     rtpctx->start_time_realtime = s->start_time_realtime;
  60
  61     avcodec_copy_context(rtpctx->streams[0]->codec, st->codec);
  62
  63     if (handle) {
  64         ffio_fdopen(&rtpctx->pb, handle);
  65     } else
  66         ffio_open_dyn_packet_buf(&rtpctx->pb, packet_size);
  67     ret = avformat_write_header(rtpctx, &opts);
  68     av_dict_free(&opts);
  69
  70     if (ret) {
  71         if (handle) {
  72             avio_close(rtpctx->pb);
  73         } else {
  74             uint8_t *ptr;
  75             avio_close_dyn_buf(rtpctx->pb, &ptr);
  76             av_free(ptr);
  77         }
  78         avformat_free_context(rtpctx);
  79         return NULL;
  80     }
  81
  82     return rtpctx;
  83 }
  84