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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 PayloadContext *mpegts_new_context(void)
  34. {
  35.     return av_mallocz(sizeof(PayloadContext));
  36. }
  37.  
  38. static void mpegts_free_context(PayloadContext *data)
  39. {
  40.     if (!data)
  41.         return;
  42.     if (data->ts)
  43.         ff_mpegts_parse_close(data->ts);
  44.     av_free(data);
  45. }
  46.  
  47. static av_cold int mpegts_init(AVFormatContext *ctx, int st_index,
  48.                                PayloadContext *data)
  49. {
  50.     data->ts = ff_mpegts_parse_open(ctx);
  51.     if (!data->ts)
  52.         return AVERROR(ENOMEM);
  53.     return 0;
  54. }
  55.  
  56. static int mpegts_handle_packet(AVFormatContext *ctx, PayloadContext *data,
  57.                                 AVStream *st, AVPacket *pkt, uint32_t *timestamp,
  58.                                 const uint8_t *buf, int len, uint16_t seq,
  59.                                 int flags)
  60. {
  61.     int ret;
  62.  
  63.     // We don't want to use the RTP timestamps at all. If the mpegts demuxer
  64.     // doesn't set any pts/dts, the generic rtpdec code shouldn't try to
  65.     // fill it in either, since the mpegts and RTP timestamps are in totally
  66.     // different ranges.
  67.     *timestamp = RTP_NOTS_VALUE;
  68.  
  69.     if (!data->ts)
  70.         return AVERROR(EINVAL);
  71.  
  72.     if (!buf) {
  73.         if (data->read_buf_index >= data->read_buf_size)
  74.             return AVERROR(EAGAIN);
  75.         ret = ff_mpegts_parse_packet(data->ts, pkt, data->buf + data->read_buf_index,
  76.                                      data->read_buf_size - data->read_buf_index);
  77.         if (ret < 0)
  78.             return AVERROR(EAGAIN);
  79.         data->read_buf_index += ret;
  80.         if (data->read_buf_index < data->read_buf_size)
  81.             return 1;
  82.         else
  83.             return 0;
  84.     }
  85.  
  86.     ret = ff_mpegts_parse_packet(data->ts, pkt, buf, len);
  87.     /* The only error that can be returned from ff_mpegts_parse_packet
  88.      * is "no more data to return from the provided buffer", so return
  89.      * AVERROR(EAGAIN) for all errors */
  90.     if (ret < 0)
  91.         return AVERROR(EAGAIN);
  92.     if (ret < len) {
  93.         data->read_buf_size = FFMIN(len - ret, sizeof(data->buf));
  94.         memcpy(data->buf, buf + ret, data->read_buf_size);
  95.         data->read_buf_index = 0;
  96.         return 1;
  97.     }
  98.     return 0;
  99. }
  100.  
  101. RTPDynamicProtocolHandler ff_mpegts_dynamic_handler = {
  102.     .codec_type        = AVMEDIA_TYPE_DATA,
  103.     .parse_packet      = mpegts_handle_packet,
  104.     .alloc             = mpegts_new_context,
  105.     .init              = mpegts_init,
  106.     .free              = mpegts_free_context,
  107.     .static_payload_id = 33,
  108. };
  109.