/*
  * MSF 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 "internal.h"
 
 static int msf_probe(AVProbeData *p)
 {
     if (memcmp(p->buf, "MSF", 3))
         return 0;
 
     if (AV_RB32(p->buf+8) <= 0)
         return 0;
 
     if (AV_RB32(p->buf+16) <= 0)
         return 0;
 

     if (AV_RB32(p->buf+4) > 16)
         return AVPROBE_SCORE_MAX / 5; //unsupported / unknown codec
 

     return AVPROBE_SCORE_MAX / 3 * 2;
 }
 
 static int msf_read_header(AVFormatContext *s)
 {

     unsigned codec, size;

     AVStream *st;

     int ret;

 
     avio_skip(s->pb, 4);
 
     st = avformat_new_stream(s, NULL);
     if (!st)
         return AVERROR(ENOMEM);
 

     st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;

     codec                  = avio_rb32(s->pb);

     st->codecpar->channels    = avio_rb32(s->pb);
     if (st->codecpar->channels <= 0 || st->codecpar->channels >= INT_MAX / 1024)

         return AVERROR_INVALIDDATA;
     size = avio_rb32(s->pb);

     st->codecpar->sample_rate = avio_rb32(s->pb);
     if (st->codecpar->sample_rate <= 0)

         return AVERROR_INVALIDDATA;

     // avio_rb32(s->pb); /* byte flags with encoder info */

     switch (codec) {

     case 0: st->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE; break;

     case 1: st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE; break;

     case 3: st->codecpar->block_align = 16 * st->codecpar->channels;
             st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX; break;

     case 4:
     case 5:
     case 6: st->codecpar->block_align = (codec == 4 ? 96 : codec == 5 ? 152 : 192) * st->codecpar->channels;
             ret = ff_alloc_extradata(st->codecpar, 14);
             if (ret < 0)
                 return ret;
             memset(st->codecpar->extradata, 0, st->codecpar->extradata_size);

             AV_WL16(st->codecpar->extradata, 1); /* version */
             AV_WL16(st->codecpar->extradata+2, 2048 * st->codecpar->channels); /* unknown size */
             AV_WL16(st->codecpar->extradata+6, codec == 4 ? 1 : 0); /* joint stereo */
             AV_WL16(st->codecpar->extradata+8, codec == 4 ? 1 : 0); /* joint stereo (repeat?) */

             AV_WL16(st->codecpar->extradata+10, 1);
             st->codecpar->codec_id = AV_CODEC_ID_ATRAC3;    break;

     case 7: st->need_parsing = AVSTREAM_PARSE_FULL_RAW;

             st->codecpar->codec_id = AV_CODEC_ID_MP3;       break;

     default:
             avpriv_request_sample(s, "Codec %d", codec);
             return AVERROR_PATCHWELCOME;
     }

     st->duration = av_get_audio_frame_duration2(st->codecpar, size);

     avio_skip(s->pb, 0x40 - avio_tell(s->pb));

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

 
     return 0;
 }
 
 static int msf_read_packet(AVFormatContext *s, AVPacket *pkt)
 {

     AVCodecParameters *par = s->streams[0]->codecpar;

     return av_get_packet(s->pb, pkt, par->block_align ? par->block_align : 1024 * par->channels);

 }
 
 AVInputFormat ff_msf_demuxer = {
     .name           = "msf",

     .long_name      = NULL_IF_CONFIG_SMALL("Sony PS3 MSF"),

     .read_probe     = msf_probe,
     .read_header    = msf_read_header,
     .read_packet    = msf_read_packet,
     .extensions     = "msf",
 };