/*

 * RAW PCM demuxers

 * Copyright (c) 2002 Fabrice Bellard

 * Copyright (c) 2022 Jack Bruienne

 *

 * 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/avstring.h"

#include "avformat.h"

#include "demux.h"

#include "internal.h"

#include "pcm.h"

#include "libavutil/log.h"

#include "libavutil/opt.h"

#include "libavutil/avassert.h"

typedef struct DFPWMAudioDemuxerContext {

    AVClass *class;

    int sample_rate;

    AVChannelLayout ch_layout;

} DFPWMAudioDemuxerContext;

static int dfpwm_read_header(AVFormatContext *s)

{

    DFPWMAudioDemuxerContext *s1 = s->priv_data;

    AVCodecParameters *par;

    AVStream *st;

    int ret;

    st = avformat_new_stream(s, NULL);

    if (!st)

        return AVERROR(ENOMEM);

    par = st->codecpar;

    par->codec_type  = AVMEDIA_TYPE_AUDIO;

    par->codec_id    = AV_CODEC_ID_DFPWM;

    par->sample_rate = s1->sample_rate;

    ret = av_channel_layout_copy(&par->ch_layout, &s1->ch_layout);

    if (ret < 0)

        return ret;

    par->bits_per_coded_sample = 1;

    par->block_align = 1;

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

    return 0;

}

static const AVOption dfpwm_options[] = {

    { "sample_rate", "", offsetof(DFPWMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },

    { "ch_layout",   "", offsetof(DFPWMAudioDemuxerContext, ch_layout),   AV_OPT_TYPE_CHLAYOUT, {.str = "mono"}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },

{ NULL },

};

static const AVClass dfpwm_demuxer_class = {

    .class_name = "dfpwm demuxer",

    .item_name  = av_default_item_name,

    .option     = dfpwm_options,

    .version    = LIBAVUTIL_VERSION_INT,

};

const FFInputFormat ff_dfpwm_demuxer = {

    .p.name         = "dfpwm",

    .p.long_name    = NULL_IF_CONFIG_SMALL("raw DFPWM1a"),

    .p.flags        = AVFMT_GENERIC_INDEX,

    .p.extensions   = "dfpwm",

    .p.priv_class   = &dfpwm_demuxer_class,

    .priv_data_size = sizeof(DFPWMAudioDemuxerContext),

    .read_header    = dfpwm_read_header,

    .read_packet    = ff_pcm_read_packet,

    .read_seek      = ff_pcm_read_seek,

    .raw_codec_id   = AV_CODEC_ID_DFPWM,

};