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/*

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 * ACM demuxer

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 * Copyright (c) 2015 Paul B Mahol

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 *

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 * This file is part of FFmpeg.

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 *

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 * FFmpeg is free software; you can redistribute it and/or

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 * modify it under the terms of the GNU Lesser General Public

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 * License as published by the Free Software Foundation; either

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 * version 2.1 of the License, or (at your option) any later version.

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 *

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 * FFmpeg is distributed in the hope that it will be useful,

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 * but WITHOUT ANY WARRANTY; without even the implied warranty of

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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

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 * Lesser General Public License for more details.

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 *

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 * You should have received a copy of the GNU Lesser General Public

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 * License along with FFmpeg; if not, write to the Free Software

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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

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 */

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#include "libavutil/intreadwrite.h"

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#include "avformat.h"

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#include "rawdec.h"

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#include "internal.h"

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static int acm_probe(AVProbeData *p)

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{

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    if (AV_RB32(p->buf) != 0x97280301)

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        return 0;

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    return AVPROBE_SCORE_MAX / 3 * 2;

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}

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static int acm_read_header(AVFormatContext *s)

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{

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    AVStream *st;

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    int ret;

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    st = avformat_new_stream(s, NULL);

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    if (!st)

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        return AVERROR(ENOMEM);

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    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

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    st->codec->codec_id   = AV_CODEC_ID_INTERPLAY_ACM;

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    ff_alloc_extradata(st->codec, 14);

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    if (!st->codec->extradata)

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        return AVERROR(ENOMEM);

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

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    if (ret < 10)

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        return ret < 0 ? ret : AVERROR_EOF;

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    st->codec->channels    = AV_RL16(st->codec->extradata +  8);

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    st->codec->sample_rate = AV_RL16(st->codec->extradata + 10);

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    if (st->codec->channels <= 0 || st->codec->sample_rate <= 0)

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        return AVERROR_INVALIDDATA;

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    st->start_time         = 0;

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

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    st->need_parsing       = AVSTREAM_PARSE_FULL_RAW;

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

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    return 0;

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}

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AVInputFormat ff_acm_demuxer = {

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    .name           = "acm",

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    .long_name      = NULL_IF_CONFIG_SMALL("Interplay ACM"),

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    .read_probe     = acm_probe,

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    .read_header    = acm_read_header,

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    .read_packet    = ff_raw_read_partial_packet,

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    .flags          = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS,

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    .extensions     = "acm",

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    .raw_codec_id   = AV_CODEC_ID_INTERPLAY_ACM,

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};

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