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  1. /*
  2.  * RTP MPEG2TS depacketizer
  3.  * Copyright (c) 2003 Fabrice Bellard
  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 "libavutil/attributes.h"
  23. #include "mpegts.h"
  24. #include "rtpdec_formats.h"
  25.  
  26. struct PayloadContext {
  27.     struct MpegTSContext *ts;
  28.     int read_buf_index;
  29.     int read_buf_size;
  30.     uint8_t buf[RTP_MAX_PACKET_LENGTH];
  31. };
  32.  
  33. static void mpegts_close_context(PayloadContext *data)
  34. {
  35.     if (!data)
  36.         return;
  37.     if (data->ts)
  38.         avpriv_mpegts_parse_close(data->ts);
  39. }
  40.  
  41. static av_cold int mpegts_init(AVFormatContext *ctx, int st_index,
  42.                                PayloadContext *data)
  43. {
  44.     data->ts = avpriv_mpegts_parse_open(ctx);
  45.     if (!data->ts)
  46.         return AVERROR(ENOMEM);
  47.     return 0;
  48. }
  49.  
  50. static int mpegts_handle_packet(AVFormatContext *ctx, PayloadContext *data,
  51.                                 AVStream *st, AVPacket *pkt, uint32_t *timestamp,
  52.                                 const uint8_t *buf, int len, uint16_t seq,
  53.                                 int flags)
  54. {
  55.     int ret;
  56.  
  57.     // We don't want to use the RTP timestamps at all. If the mpegts demuxer
  58.     // doesn't set any pts/dts, the generic rtpdec code shouldn't try to
  59.     // fill it in either, since the mpegts and RTP timestamps are in totally
  60.     // different ranges.
  61.     *timestamp = RTP_NOTS_VALUE;
  62.  
  63.     if (!buf) {
  64.         if (data->read_buf_index >= data->read_buf_size)
  65.             return AVERROR(EAGAIN);
  66.         ret = avpriv_mpegts_parse_packet(data->ts, pkt, data->buf + data->read_buf_index,
  67.                                          data->read_buf_size - data->read_buf_index);
  68.         if (ret < 0)
  69.             return AVERROR(EAGAIN);
  70.         data->read_buf_index += ret;
  71.         if (data->read_buf_index < data->read_buf_size)
  72.             return 1;
  73.         else
  74.             return 0;
  75.     }
  76.  
  77.     ret = avpriv_mpegts_parse_packet(data->ts, pkt, buf, len);
  78.     /* The only error that can be returned from avpriv_mpegts_parse_packet
  79.      * is "no more data to return from the provided buffer", so return
  80.      * AVERROR(EAGAIN) for all errors */
  81.     if (ret < 0)
  82.         return AVERROR(EAGAIN);
  83.     if (ret < len) {
  84.         data->read_buf_size = FFMIN(len - ret, sizeof(data->buf));
  85.         memcpy(data->buf, buf + ret, data->read_buf_size);
  86.         data->read_buf_index = 0;
  87.         return 1;
  88.     }
  89.     return 0;
  90. }
  91.  
  92. RTPDynamicProtocolHandler ff_mpegts_dynamic_handler = {
  93.     .codec_type        = AVMEDIA_TYPE_DATA,
  94.     .priv_data_size    = sizeof(PayloadContext),
  95.     .parse_packet      = mpegts_handle_packet,
  96.     .init              = mpegts_init,
  97.     .close             = mpegts_close_context,
  98.     .static_payload_id = 33,
  99. };
  100.