/*
  * 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 "avformat.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;
     int channels;

 } PCMAudioDemuxerContext;

 static int pcm_read_header(AVFormatContext *s)

 {

     PCMAudioDemuxerContext *s1 = s->priv_data;

     AVStream *st;

     uint8_t *mime_type = NULL;

 
     st = avformat_new_stream(s, NULL);
     if (!st)
         return AVERROR(ENOMEM);
 
 

     st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
     st->codecpar->codec_id    = s->iformat->raw_codec_id;
     st->codecpar->sample_rate = s1->sample_rate;
     st->codecpar->channels    = s1->channels;

     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;
         size_t len = strlen(s->iformat->mime_type);
         if (!strncmp(s->iformat->mime_type, mime_type, len)) {
             uint8_t *options = mime_type + len;
             len = strlen(mime_type);
             while (options < mime_type + len) {
                 options = strstr(options, ";");
                 if (!options++)
                     break;
                 if (!rate)
                     sscanf(options, " rate=%d",     &rate);
                 if (!channels)
                     sscanf(options, " channels=%d", &channels);
             }
             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;
             }
             st->codecpar->sample_rate = rate;
             if (channels > 0)
                 st->codecpar->channels = channels;
         }
     }

     av_freep(&mime_type);

     st->codecpar->bits_per_coded_sample =
         av_get_bits_per_sample(st->codecpar->codec_id);

     av_assert0(st->codecpar->bits_per_coded_sample > 0);

     st->codecpar->block_align =
         st->codecpar->bits_per_coded_sample * st->codecpar->channels / 8;

     avpriv_set_pts_info(st, 64, 1, st->codecpar->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 },

     { "channels",    "", offsetof(PCMAudioDemuxerContext, channels),    AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },

     { NULL },
 };
 

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

 static const AVClass name_ ## _demuxer_class = {            \
     .class_name = #name_ " demuxer",                        \
     .item_name  = av_default_item_name,                     \
     .option     = pcm_options,                              \
     .version    = LIBAVUTIL_VERSION_INT,                    \
 };                                                          \
 AVInputFormat ff_pcm_ ## name_ ## _demuxer = {              \
     .name           = #name_,                               \
     .long_name      = NULL_IF_CONFIG_SMALL(long_name_),     \

     .priv_data_size = sizeof(PCMAudioDemuxerContext),       \
     .read_header    = pcm_read_header,                      \

     .read_packet    = ff_pcm_read_packet,                   \

     .read_seek      = ff_pcm_read_seek,                     \

     .flags          = AVFMT_GENERIC_INDEX,                  \
     .extensions     = ext,                                  \

     .raw_codec_id   = codec,                                \

     .priv_class     = &name_ ## _demuxer_class,             \

     __VA_ARGS__                                             \

 };
 

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

        NULL, AV_CODEC_ID_PCM_F64BE)

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

        NULL, AV_CODEC_ID_PCM_F64LE)

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

        NULL, AV_CODEC_ID_PCM_F32BE)

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

        NULL, AV_CODEC_ID_PCM_F32LE)

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

        NULL, AV_CODEC_ID_PCM_S32BE)

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

        NULL, AV_CODEC_ID_PCM_S32LE)

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

        NULL, AV_CODEC_ID_PCM_S24BE)

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

        NULL, AV_CODEC_ID_PCM_S24LE)

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

        AV_NE("sw", NULL), AV_CODEC_ID_PCM_S16BE)

 PCMDEF(s16le, "PCM signed 16-bit little-endian",

        AV_NE(NULL, "sw"), AV_CODEC_ID_PCM_S16LE, .mime_type = "audio/L16",)

 PCMDEF(s8, "PCM signed 8-bit",

        "sb", AV_CODEC_ID_PCM_S8)

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

        NULL, AV_CODEC_ID_PCM_U32BE)

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

        NULL, AV_CODEC_ID_PCM_U32LE)

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

        NULL, AV_CODEC_ID_PCM_U24BE)

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

        NULL, AV_CODEC_ID_PCM_U24LE)

 PCMDEF(u16be, "PCM unsigned 16-bit big-endian",

        AV_NE("uw", NULL), AV_CODEC_ID_PCM_U16BE)

 PCMDEF(u16le, "PCM unsigned 16-bit little-endian",

        AV_NE(NULL, "uw"), AV_CODEC_ID_PCM_U16LE)

 PCMDEF(u8, "PCM unsigned 8-bit",

        "ub", AV_CODEC_ID_PCM_U8)

 PCMDEF(alaw, "PCM A-law",

        "al", AV_CODEC_ID_PCM_ALAW)

 PCMDEF(mulaw, "PCM mu-law",

        "ul", AV_CODEC_ID_PCM_MULAW)

 
 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 },
     { "channels",    "", offsetof(PCMAudioDemuxerContext, channels),    AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, 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,
 };
 
 AVInputFormat ff_sln_demuxer = {
     .name           = "sln",
     .long_name      = NULL_IF_CONFIG_SMALL("Asterisk raw pcm"),
     .priv_data_size = sizeof(PCMAudioDemuxerContext),
     .read_header    = pcm_read_header,
     .read_packet    = ff_pcm_read_packet,
     .read_seek      = ff_pcm_read_seek,
     .flags          = AVFMT_GENERIC_INDEX,
     .extensions     = "sln",
     .raw_codec_id   = AV_CODEC_ID_PCM_S16LE,
     .priv_class     = &sln_demuxer_class,
 };