yading@11: /*
yading@11:  * Ensoniq Paris Audio File demuxer
yading@11:  * Copyright (c) 2012 Paul B Mahol
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "pcm.h"
yading@11: 
yading@11: static int epaf_probe(AVProbeData *p)
yading@11: {
yading@11:     if (((AV_RL32(p->buf) == MKTAG('f','a','p',' ') &&
yading@11:           AV_RL32(p->buf + 8) == 1) ||
yading@11:          (AV_RL32(p->buf) == MKTAG(' ','p','a','f') &&
yading@11:           AV_RN32(p->buf + 8) == 0)) &&
yading@11:        !AV_RN32(p->buf +  4) && AV_RN32(p->buf + 12) &&
yading@11:         AV_RN32(p->buf + 20))
yading@11:         return AVPROBE_SCORE_MAX / 4 * 3;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int epaf_read_header(AVFormatContext *s)
yading@11: {
yading@11:     int le, sample_rate, codec, channels;
yading@11:     AVStream *st;
yading@11: 
yading@11:     avio_skip(s->pb, 4);
yading@11:     if (avio_rl32(s->pb))
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     le = avio_rl32(s->pb);
yading@11:     if (le && le != 1)
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     if (le) {
yading@11:         sample_rate = avio_rl32(s->pb);
yading@11:         codec       = avio_rl32(s->pb);
yading@11:         channels    = avio_rl32(s->pb);
yading@11:     } else {
yading@11:         sample_rate = avio_rb32(s->pb);
yading@11:         codec       = avio_rb32(s->pb);
yading@11:         channels    = avio_rb32(s->pb);
yading@11:     }
yading@11: 
yading@11:     if (!channels || !sample_rate)
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     st = avformat_new_stream(s, NULL);
yading@11:     if (!st)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
yading@11:     st->codec->channels    = channels;
yading@11:     st->codec->sample_rate = sample_rate;
yading@11:     switch (codec) {
yading@11:     case 0:
yading@11:         st->codec->codec_id = le ? AV_CODEC_ID_PCM_S16LE : AV_CODEC_ID_PCM_S16BE;
yading@11:         break;
yading@11:     case 2:
yading@11:         st->codec->codec_id = AV_CODEC_ID_PCM_S8;
yading@11:         break;
yading@11:     case 1:
yading@11:         avpriv_request_sample(s, "24-bit Paris PCM format");
yading@11:     default:
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     }
yading@11: 
yading@11:     st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
yading@11:     st->codec->block_align = st->codec->bits_per_coded_sample * st->codec->channels / 8;
yading@11: 
yading@11:     avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
yading@11: 
yading@11:     if (avio_skip(s->pb, 2024) < 0)
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_epaf_demuxer = {
yading@11:     .name           = "epaf",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("Ensoniq Paris Audio File"),
yading@11:     .read_probe     = epaf_probe,
yading@11:     .read_header    = epaf_read_header,
yading@11:     .read_packet    = ff_pcm_read_packet,
yading@11:     .read_seek      = ff_pcm_read_seek,
yading@11:     .extensions     = "paf,fap",
yading@11:     .flags          = AVFMT_GENERIC_INDEX,
yading@11: };