/*
  * SDX demuxer
  * Copyright (c) 2017 Paul B Mahol
  *
  * 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 "libavutil/avstring.h"
 #include "libavutil/intreadwrite.h"
 #include "avformat.h"
 #include "internal.h"
 #include "pcm.h"
 
 static int sdx_probe(AVProbeData *p)
 {
     if (AV_RB32(p->buf) == AV_RB32("SDX:"))
         return AVPROBE_SCORE_EXTENSION;
     return 0;
 }
 
 static int sdx_read_header(AVFormatContext *s)
 {
     AVStream *st;
     int depth, length;
 
     avio_skip(s->pb, 4);
     while (!avio_feof(s->pb)) {
         if (avio_r8(s->pb) == 0x1a)
             break;
     }
     if (avio_r8(s->pb) != 1)
         return AVERROR_INVALIDDATA;
     length = avio_r8(s->pb);
     avio_skip(s->pb, length);
     avio_skip(s->pb, 4);
     depth = avio_r8(s->pb);
 
     st = avformat_new_stream(s, NULL);
     if (!st)
         return AVERROR(ENOMEM);
 
     st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
     st->codecpar->channels = 1;
     st->codecpar->sample_rate = avio_rl32(s->pb);
     switch (depth) {
     case 8:
         st->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
         break;
     case 16:
         st->codecpar->codec_id = AV_CODEC_ID_PCM_U16LE;
         break;
     case 24:
         st->codecpar->codec_id = AV_CODEC_ID_PCM_U24LE;
         break;
     case 32:
         st->codecpar->codec_id = AV_CODEC_ID_PCM_U32LE;
         break;
     default:
         return AVERROR_INVALIDDATA;
     }
     avio_skip(s->pb, 16);
     st->codecpar->block_align = depth / 8;
 
     return 0;
 }
 
 AVInputFormat ff_sdx_demuxer = {
     .name           = "sdx",
     .long_name      = NULL_IF_CONFIG_SMALL("Sample Dump eXchange"),
     .read_probe     = sdx_probe,
     .read_header    = sdx_read_header,
     .read_packet    = ff_pcm_read_packet,
     .read_seek      = ff_pcm_read_seek,
     .extensions     = "sdx",
     .flags          = AVFMT_GENERIC_INDEX,
 };