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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 "rtp.h"
  26. #include "libavutil/opt.h"
  27.  
  28. int 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.     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_MP4A_LATM;
  62.  
  63.     /* Get the payload type from the codec */
  64.     if (st->id < RTP_PT_PRIVATE)
  65.         rtpctx->streams[0]->id =
  66.             ff_rtp_get_payload_type(s, st->codec, idx);
  67.     else
  68.         rtpctx->streams[0]->id = st->id;
  69.  
  70.  
  71.     if (av_opt_get(s, "rtpflags", AV_OPT_SEARCH_CHILDREN, &rtpflags) >= 0)
  72.         av_dict_set(&opts, "rtpflags", rtpflags, AV_DICT_DONT_STRDUP_VAL);
  73.  
  74.     /* Set the synchronized start time. */
  75.     rtpctx->start_time_realtime = s->start_time_realtime;
  76.  
  77.     avcodec_copy_context(rtpctx->streams[0]->codec, st->codec);
  78.  
  79.     if (handle) {
  80.         ret = ffio_fdopen(&rtpctx->pb, handle);
  81.         if (ret < 0)
  82.             ffurl_close(handle);
  83.     } else
  84.         ret = ffio_open_dyn_packet_buf(&rtpctx->pb, packet_size);
  85.     if (!ret)
  86.         ret = avformat_write_header(rtpctx, &opts);
  87.     av_dict_free(&opts);
  88.  
  89.     if (ret) {
  90.         if (handle && rtpctx->pb) {
  91.             avio_close(rtpctx->pb);
  92.         } else if (rtpctx->pb) {
  93.             uint8_t *ptr;
  94.             avio_close_dyn_buf(rtpctx->pb, &ptr);
  95.             av_free(ptr);
  96.         }
  97.         avformat_free_context(rtpctx);
  98.         return ret;
  99.     }
  100.  
  101.     *out = rtpctx;
  102.     return 0;
  103.  
  104. fail:
  105.     av_free(rtpctx);
  106.     if (handle)
  107.         ffurl_close(handle);
  108.     return ret;
  109. }
  110.