/*
  * ACM demuxer
  * Copyright (c) 2015 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 "avformat.h"
 #include "rawdec.h"
 #include "internal.h"
 
 static int acm_probe(AVProbeData *p)
 {
     if (AV_RB32(p->buf) != 0x97280301)
         return 0;
 
     return AVPROBE_SCORE_MAX / 3 * 2;
 }
 
 static int acm_read_header(AVFormatContext *s)
 {
     AVStream *st;
     int ret;
 
     st = avformat_new_stream(s, NULL);
     if (!st)
         return AVERROR(ENOMEM);
 

     st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
     st->codecpar->codec_id   = AV_CODEC_ID_INTERPLAY_ACM;

     ff_alloc_extradata(st->codecpar, 14);
     if (!st->codecpar->extradata)

         return AVERROR(ENOMEM);

     ret = avio_read(s->pb, st->codecpar->extradata, 14);

     if (ret < 10)
         return ret < 0 ? ret : AVERROR_EOF;
 

     st->codecpar->channels    = AV_RL16(st->codecpar->extradata +  8);
     st->codecpar->sample_rate = AV_RL16(st->codecpar->extradata + 10);
     if (st->codecpar->channels <= 0 || st->codecpar->sample_rate <= 0)

         return AVERROR_INVALIDDATA;
     st->start_time         = 0;

     st->duration           = AV_RL32(st->codecpar->extradata +  4) / st->codecpar->channels;

     st->need_parsing       = AVSTREAM_PARSE_FULL_RAW;

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

 
     return 0;
 }
 
 AVInputFormat ff_acm_demuxer = {
     .name           = "acm",
     .long_name      = NULL_IF_CONFIG_SMALL("Interplay ACM"),
     .read_probe     = acm_probe,
     .read_header    = acm_read_header,
     .read_packet    = ff_raw_read_partial_packet,
     .flags          = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS,
     .extensions     = "acm",
     .raw_codec_id   = AV_CODEC_ID_INTERPLAY_ACM,
 };