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  1. /*
  2.  * SDR2 demuxer
  3.  * Copyright (c) 2014 Paul B Mahol
  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/intreadwrite.h"
  23. #include "avformat.h"
  24. #include "internal.h"
  25.  
  26. static int sdr2_probe(AVProbeData *p)
  27. {
  28.     if (AV_RL32(p->buf) != MKTAG('S', 'R', 'A', 1))
  29.         return 0;
  30.  
  31.     return AVPROBE_SCORE_EXTENSION;
  32. }
  33.  
  34. #define FIRST 0xA8
  35.  
  36. static int sdr2_read_header(AVFormatContext *s)
  37. {
  38.     AVStream *st, *ast;
  39.  
  40.     ast = avformat_new_stream(s, 0);
  41.     if (!ast)
  42.         return AVERROR(ENOMEM);
  43.  
  44.     st = avformat_new_stream(s, 0);
  45.     if (!st)
  46.         return AVERROR(ENOMEM);
  47.  
  48.     avio_skip(s->pb, 20);
  49.     avpriv_set_pts_info(st, 64, 1, avio_rl32(s->pb));
  50.     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  51.     st->codec->width      = avio_rl32(s->pb);
  52.     st->codec->height     = avio_rl32(s->pb);
  53.     st->codec->codec_id   = AV_CODEC_ID_H264;
  54.     st->need_parsing      = AVSTREAM_PARSE_FULL;
  55.  
  56.     ast->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
  57.     ast->codec->channels    = 1;
  58.     ast->codec->sample_rate = 8000;
  59.     ast->codec->codec_id    = AV_CODEC_ID_PCM_S16LE;
  60.     avpriv_set_pts_info(ast, 64, 1, 8000);
  61.  
  62.     avio_seek(s->pb, FIRST, SEEK_SET);
  63.  
  64.     return 0;
  65. }
  66.  
  67. static const uint8_t header[24] = {
  68.     0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1e,
  69.     0xa6, 0x80, 0xb0, 0x7e, 0x40, 0x00, 0x00, 0x00,
  70.     0x01, 0x68, 0xce, 0x38, 0x80, 0x00, 0x00, 0x00
  71. };
  72.  
  73. static int sdr2_read_packet(AVFormatContext *s, AVPacket *pkt)
  74. {
  75.     int64_t pos;
  76.     unsigned next;
  77.     int flags, ret = 0, is_video;
  78.  
  79.     pos = avio_tell(s->pb);
  80.  
  81.     flags = avio_rl32(s->pb);
  82.     avio_skip(s->pb, 4);
  83.  
  84.     next = avio_rl32(s->pb);
  85.     if (next <= 52)
  86.         return AVERROR_INVALIDDATA;
  87.  
  88.     avio_skip(s->pb, 6);
  89.     is_video = avio_rl32(s->pb);
  90.     avio_skip(s->pb, 30);
  91.  
  92.     if (pos == FIRST) {
  93.         if (av_new_packet(pkt, next - 52 + 24) < 0)
  94.             return AVERROR(ENOMEM);
  95.         memcpy(pkt->data, header, 24);
  96.         ret = avio_read(s->pb, pkt->data + 24, next - 52);
  97.         if (ret < 0) {
  98.             av_free_packet(pkt);
  99.             return ret;
  100.         }
  101.         av_shrink_packet(pkt, ret + 24);
  102.     } else {
  103.         ret = av_get_packet(s->pb, pkt, next - 52);
  104.     }
  105.     pkt->stream_index = !!is_video;
  106.     pkt->pos = pos;
  107.     if (flags & (1 << 12))
  108.         pkt->flags |= AV_PKT_FLAG_KEY;
  109.  
  110.     return ret;
  111. }
  112.  
  113. AVInputFormat ff_sdr2_demuxer = {
  114.     .name        = "sdr2",
  115.     .long_name   = NULL_IF_CONFIG_SMALL("SDR2"),
  116.     .read_probe  = sdr2_probe,
  117.     .read_header = sdr2_read_header,
  118.     .read_packet = sdr2_read_packet,
  119.     .extensions  = "sdr2",
  120.     .flags       = AVFMT_GENERIC_INDEX,
  121. };
  122.