/*
  * RAW DTS demuxer
  * Copyright (c) 2008 Benjamin Larsson
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "libavcodec/bytestream.h"
 #include "avformat.h"

 #include "rawdec.h"

 
 #define DCA_MARKER_14B_BE 0x1FFFE800
 #define DCA_MARKER_14B_LE 0xFF1F00E8
 #define DCA_MARKER_RAW_BE 0x7FFE8001
 #define DCA_MARKER_RAW_LE 0xFE7F0180
 
 static int dts_probe(AVProbeData *p)
 {
     const uint8_t *buf, *bufp;
     uint32_t state = -1;
     int markers[3] = {0};
     int sum, max;
 
     buf = p->buf;
 
     for(; buf < (p->buf+p->buf_size)-2; buf+=2) {
         bufp = buf;
         state = (state << 16) | bytestream_get_be16(&bufp);
 
         /* regular bitstream */
         if (state == DCA_MARKER_RAW_BE || state == DCA_MARKER_RAW_LE)
             markers[0]++;
 
         /* 14 bits big-endian bitstream */
         if (state == DCA_MARKER_14B_BE)
             if ((bytestream_get_be16(&bufp) & 0xFFF0) == 0x07F0)
                 markers[1]++;
 
         /* 14 bits little-endian bitstream */
         if (state == DCA_MARKER_14B_LE)
             if ((bytestream_get_be16(&bufp) & 0xF0FF) == 0xF007)
                 markers[2]++;
     }
     sum = markers[0] + markers[1] + markers[2];
     max = markers[1] > markers[0];
     max = markers[2] > markers[max] ? 2 : max;
     if (markers[max] > 3 && p->buf_size / markers[max] < 32*1024 &&
         markers[max] * 4 > sum * 3)
         return AVPROBE_SCORE_MAX/2+1;
 
     return 0;
 }
 

 AVInputFormat ff_dts_demuxer = {

     "dts",
     NULL_IF_CONFIG_SMALL("raw DTS"),
     0,
     dts_probe,
     ff_raw_audio_read_header,
     ff_raw_read_partial_packet,
     .flags= AVFMT_GENERIC_INDEX,
     .extensions = "dts",
     .value = CODEC_ID_DTS,
 };