/*

 * RAW PCM demuxers

 * Copyright (c) 2002 Fabrice Bellard

 *

 * 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 "config_components.h"

#include "libavutil/avstring.h"

#include "libavutil/channel_layout.h"

#include "libavutil/mem.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 PCMAudioDemuxerContext {

    AVClass *class;

    int sample_rate;

    AVChannelLayout ch_layout;

} PCMAudioDemuxerContext;

static int pcm_read_header(AVFormatContext *s)

{

    PCMAudioDemuxerContext *s1 = s->priv_data;

    AVCodecParameters *par;

    AVStream *st;

    uint8_t *mime_type = NULL;

    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    = ffifmt(s->iformat)->raw_codec_id;

    par->sample_rate = s1->sample_rate;

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

    if (ret < 0)

        return ret;

    av_opt_get(s->pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type);

    if (mime_type && s->iformat->mime_type) {

        int rate = 0, channels = 0, little_endian = 0;

        const char *options;

        if (av_stristart(mime_type, s->iformat->mime_type, &options)) { /* audio/L16 */

            while (options = strchr(options, ';')) {

                options++;

                if (!rate)

                    sscanf(options, " rate=%d",     &rate);

                if (!channels)

                    sscanf(options, " channels=%d", &channels);

                if (!little_endian) {

                     char val[sizeof("little-endian")];

                     if (sscanf(options, " endianness=%13s", val) == 1) {

                         little_endian = strcmp(val, "little-endian") == 0;

                     }

                }

            }

            if (rate <= 0) {

                av_log(s, AV_LOG_ERROR,

                       "Invalid sample_rate found in mime_type \"%s\"\n",

                       mime_type);

                av_freep(&mime_type);

                return AVERROR_INVALIDDATA;

            }

            par->sample_rate = rate;

            if (channels > 0) {

                av_channel_layout_uninit(&par->ch_layout);

                par->ch_layout.nb_channels = channels;

            }

            if (little_endian)

                par->codec_id = AV_CODEC_ID_PCM_S16LE;

        }

    }

    av_freep(&mime_type);

    par->bits_per_coded_sample = av_get_bits_per_sample(par->codec_id);

    av_assert0(par->bits_per_coded_sample > 0);

    par->block_align = par->bits_per_coded_sample * par->ch_layout.nb_channels / 8;

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

    return 0;

}

static const AVOption pcm_options[] = {

    { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 44100}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },

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

    { NULL },

};

static const AVClass pcm_demuxer_class = {

    .class_name = "pcm demuxer",

    .item_name  = av_default_item_name,

    .option     = pcm_options,

    .version    = LIBAVUTIL_VERSION_INT,

};

#define PCMDEF_0(name_, long_name_, ext, codec, ...)

#define PCMDEF_1(name_, long_name_, ext, codec, ...)        \

const FFInputFormat ff_pcm_ ## name_ ## _demuxer = {        \

    .p.name         = #name_,                               \

    .p.long_name    = NULL_IF_CONFIG_SMALL(long_name_),     \

    .p.flags        = AVFMT_GENERIC_INDEX | AVFMT_NOTIMESTAMPS, \

    .p.extensions   = ext,                                  \

    .p.priv_class   = &pcm_demuxer_class,                   \

    .priv_data_size = sizeof(PCMAudioDemuxerContext),       \

    .read_header    = pcm_read_header,                      \

    .read_packet    = ff_pcm_read_packet,                   \

    .read_seek      = ff_pcm_read_seek,                     \

    .raw_codec_id   = codec,                                \

    __VA_ARGS__                                             \

};

#define PCMDEF_2(name, long_name, ext, codec, enabled, ...) \

    PCMDEF_ ## enabled(name, long_name, ext, codec, __VA_ARGS__)

#define PCMDEF_3(name, long_name, ext, codec, config, ...)  \

    PCMDEF_2(name, long_name, ext, codec, config,   __VA_ARGS__)

#define PCMDEF_EXT(name, long_name, ext, uppercase, ...)    \

    PCMDEF_3(name, long_name, ext, AV_CODEC_ID_PCM_ ## uppercase, \

             CONFIG_PCM_ ## uppercase ## _DEMUXER,  __VA_ARGS__)

#define PCMDEF(name, long_name, ext, uppercase)             \

    PCMDEF_EXT(name, long_name, ext, uppercase, )

PCMDEF(f64be, "PCM 64-bit floating-point big-endian",           NULL, F64BE)

PCMDEF(f64le, "PCM 64-bit floating-point little-endian",        NULL, F64LE)

PCMDEF(f32be, "PCM 32-bit floating-point big-endian",           NULL, F32BE)

PCMDEF(f32le, "PCM 32-bit floating-point little-endian",        NULL, F32LE)

PCMDEF(s32be, "PCM signed 32-bit big-endian",                   NULL, S32BE)

PCMDEF(s32le, "PCM signed 32-bit little-endian",                NULL, S32LE)

PCMDEF(s24be, "PCM signed 24-bit big-endian",                   NULL, S24BE)

PCMDEF(s24le, "PCM signed 24-bit little-endian",                NULL, S24LE)

PCMDEF_EXT(s16be, "PCM signed 16-bit big-endian",

           AV_NE("sw", NULL), S16BE, .p.mime_type = "audio/L16")

PCMDEF(s16le, "PCM signed 16-bit little-endian",   AV_NE(NULL, "sw"), S16LE)

PCMDEF(s8,    "PCM signed 8-bit",                               "sb",    S8)

PCMDEF(u32be, "PCM unsigned 32-bit big-endian",                 NULL, U32BE)

PCMDEF(u32le, "PCM unsigned 32-bit little-endian",              NULL, U32LE)

PCMDEF(u24be, "PCM unsigned 24-bit big-endian",                 NULL, U24BE)

PCMDEF(u24le, "PCM unsigned 24-bit little-endian",              NULL, U24LE)

PCMDEF(u16be, "PCM unsigned 16-bit big-endian",    AV_NE("uw", NULL), U16BE)

PCMDEF(u16le, "PCM unsigned 16-bit little-endian", AV_NE(NULL, "uw"), U16LE)

PCMDEF(u8,    "PCM unsigned 8-bit",                             "ub",    U8)

PCMDEF(alaw,  "PCM A-law",                                      "al",  ALAW)

PCMDEF(mulaw, "PCM mu-law",                                     "ul", MULAW)

PCMDEF(vidc,  "PCM Archimedes VIDC",                            NULL,  VIDC)

#if CONFIG_SLN_DEMUXER

static const AVOption sln_options[] = {

    { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 8000}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },

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

    { NULL },

};

static const AVClass sln_demuxer_class = {

    .class_name = "sln demuxer",

    .item_name  = av_default_item_name,

    .option     = sln_options,

    .version    = LIBAVUTIL_VERSION_INT,

};

const FFInputFormat ff_sln_demuxer = {

    .p.name         = "sln",

    .p.long_name    = NULL_IF_CONFIG_SMALL("Asterisk raw pcm"),

    .p.flags        = AVFMT_GENERIC_INDEX,

    .p.extensions   = "sln",

    .p.priv_class   = &sln_demuxer_class,

    .priv_data_size = sizeof(PCMAudioDemuxerContext),

    .read_header    = pcm_read_header,

    .read_packet    = ff_pcm_read_packet,

    .read_seek      = ff_pcm_read_seek,

    .raw_codec_id   = AV_CODEC_ID_PCM_S16LE,

};

#endif