/*
  * IRCAM 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 "avformat.h"
 #include "internal.h"
 #include "pcm.h"
 #include "ircam.h"
 
 static int ircam_probe(AVProbeData *p)
 {
     if ((p->buf[0] == 0x64 && p->buf[1] == 0xA3 && p->buf[3] == 0x00 &&
          p->buf[2] >=    1 && p->buf[2] <= 4) ||
         (p->buf[3] == 0x64 && p->buf[2] == 0xA3 && p->buf[0] == 0x00 &&
          p->buf[1] >=    1 && p->buf[1] <= 3) &&
         AV_RN32(p->buf + 4) && AV_RN32(p->buf + 8))
         return AVPROBE_SCORE_MAX / 4 * 3;
     return 0;
 }
 
 static const struct endianess {
     uint32_t magic;
     int      is_le;
 } table[] = {
   { 0x64A30100, 0 },
   { 0x64A30200, 1 },
   { 0x64A30300, 0 },
   { 0x64A30400, 1 },
   { 0x0001A364, 1 },
   { 0x0002A364, 0 },
   { 0x0003A364, 1 },
 };
 
 static int ircam_read_header(AVFormatContext *s)
 {
     uint32_t magic, sample_rate, channels, tag;
     const AVCodecTag *tags;
     int le = -1, i;
     AVStream *st;
 
     magic = avio_rl32(s->pb);
     for (i = 0; i < 7; i++) {
         if (magic == table[i].magic) {
             le = table[i].is_le;
             break;
         }
     }
 
     if (le == 1) {
         sample_rate = av_int2float(avio_rl32(s->pb));
         channels    = avio_rl32(s->pb);
         tag         = avio_rl32(s->pb);
         tags        = ff_codec_ircam_le_tags;
     } else if (le == 0) {
         sample_rate = av_int2float(avio_rb32(s->pb));
         channels    = avio_rb32(s->pb);
         tag         = avio_rb32(s->pb);
         tags        = ff_codec_ircam_be_tags;
     } else {
         return AVERROR_INVALIDDATA;
     }
 
     if (!channels || !sample_rate)
         return AVERROR_INVALIDDATA;
 
     st = avformat_new_stream(s, NULL);
     if (!st)
         return AVERROR(ENOMEM);
 
     st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
     st->codec->channels    = channels;
     st->codec->sample_rate = sample_rate;
 
     st->codec->codec_id = ff_codec_get_id(tags, tag);
     if (st->codec->codec_id == AV_CODEC_ID_NONE) {
         av_log(s, AV_LOG_ERROR, "unknown tag %X\n", tag);
         return AVERROR_INVALIDDATA;
     }
 
     st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
     st->codec->block_align = st->codec->bits_per_coded_sample * st->codec->channels / 8;
     avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
     avio_skip(s->pb, 1008);
 
     return 0;
 }
 
 AVInputFormat ff_ircam_demuxer = {
     .name           = "ircam",
     .long_name      = NULL_IF_CONFIG_SMALL("Berkeley/IRCAM/CARL Sound Format"),
     .read_probe     = ircam_probe,
     .read_header    = ircam_read_header,
     .read_packet    = ff_pcm_read_packet,
     .read_seek      = ff_pcm_read_seek,
     .extensions     = "sf,ircam",
     .flags          = AVFMT_GENERIC_INDEX,
 };