/*
  * Ensoniq Paris Audio File demuxer
  * Copyright (c) 2012 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/intreadwrite.h"

 #include "libavcodec/internal.h"

 #include "avformat.h"
 #include "internal.h"
 #include "pcm.h"
 
 static int epaf_probe(AVProbeData *p)
 {
     if (((AV_RL32(p->buf) == MKTAG('f','a','p',' ') &&
           AV_RL32(p->buf + 8) == 1) ||
          (AV_RL32(p->buf) == MKTAG(' ','p','a','f') &&
           AV_RN32(p->buf + 8) == 0)) &&
        !AV_RN32(p->buf +  4) && AV_RN32(p->buf + 12) &&
         AV_RN32(p->buf + 20))
         return AVPROBE_SCORE_MAX / 4 * 3;
     return 0;
 }
 
 static int epaf_read_header(AVFormatContext *s)
 {
     int le, sample_rate, codec, channels;
     AVStream *st;
 
     avio_skip(s->pb, 4);
     if (avio_rl32(s->pb))
         return AVERROR_INVALIDDATA;
 
     le = avio_rl32(s->pb);
     if (le && le != 1)
         return AVERROR_INVALIDDATA;
 
     if (le) {
         sample_rate = avio_rl32(s->pb);
         codec       = avio_rl32(s->pb);
         channels    = avio_rl32(s->pb);
     } else {
         sample_rate = avio_rb32(s->pb);
         codec       = avio_rb32(s->pb);
         channels    = avio_rb32(s->pb);
     }
 

     if (channels <= 0 || channels > FF_SANE_NB_CHANNELS || sample_rate <= 0)

         return AVERROR_INVALIDDATA;
 
     st = avformat_new_stream(s, NULL);
     if (!st)
         return AVERROR(ENOMEM);
 

     st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
     st->codecpar->channels    = channels;
     st->codecpar->sample_rate = sample_rate;

     switch (codec) {
     case 0:

         st->codecpar->codec_id = le ? AV_CODEC_ID_PCM_S16LE : AV_CODEC_ID_PCM_S16BE;

         break;
     case 2:

         st->codecpar->codec_id = AV_CODEC_ID_PCM_S8;

         break;
     case 1:

         avpriv_request_sample(s, "24-bit Paris PCM format");

     default:
         return AVERROR_INVALIDDATA;
     }
 

     st->codecpar->bits_per_coded_sample = av_get_bits_per_sample(st->codecpar->codec_id);
     st->codecpar->block_align = st->codecpar->bits_per_coded_sample * st->codecpar->channels / 8;

     avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);

 
     if (avio_skip(s->pb, 2024) < 0)
         return AVERROR_INVALIDDATA;
     return 0;
 }
 
 AVInputFormat ff_epaf_demuxer = {
     .name           = "epaf",
     .long_name      = NULL_IF_CONFIG_SMALL("Ensoniq Paris Audio File"),
     .read_probe     = epaf_probe,
     .read_header    = epaf_read_header,
     .read_packet    = ff_pcm_read_packet,
     .read_seek      = ff_pcm_read_seek,
     .extensions     = "paf,fap",
     .flags          = AVFMT_GENERIC_INDEX,
 };