/*
  * RSD demuxer
  * Copyright (c) 2013 James Almer
  *
  * 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 "libavcodec/bytestream.h"
 #include "libavutil/intreadwrite.h"
 #include "avformat.h"
 #include "avio.h"
 #include "internal.h"
 
 static const AVCodecTag rsd_tags[] = {

     { AV_CODEC_ID_ADPCM_PSX,       MKTAG('V','A','G',' ') },

     { AV_CODEC_ID_ADPCM_THP_LE,    MKTAG('G','A','D','P') },

     { AV_CODEC_ID_ADPCM_THP,       MKTAG('W','A','D','P') },

     { AV_CODEC_ID_ADPCM_IMA_RAD,   MKTAG('R','A','D','P') },

     { AV_CODEC_ID_ADPCM_IMA_WAV,   MKTAG('X','A','D','P') },

     { AV_CODEC_ID_PCM_S16BE,       MKTAG('P','C','M','B') },
     { AV_CODEC_ID_PCM_S16LE,       MKTAG('P','C','M',' ') },

     { AV_CODEC_ID_XMA2,            MKTAG('X','M','A',' ') },

     { AV_CODEC_ID_NONE, 0 },
 };
 
 static const uint32_t rsd_unsupported_tags[] = {
     MKTAG('O','G','G',' '),
 };
 

 static int rsd_probe(const AVProbeData *p)

 {

     if (memcmp(p->buf, "RSD", 3) || p->buf[3] - '0' < 2 || p->buf[3] - '0' > 6)
         return 0;
     if (AV_RL32(p->buf +  8) > 256 || !AV_RL32(p->buf +  8))

         return AVPROBE_SCORE_MAX / 8;

     if (AV_RL32(p->buf + 16) > 8*48000 || !AV_RL32(p->buf + 16))

         return AVPROBE_SCORE_MAX / 8;

     return AVPROBE_SCORE_MAX;

 }
 
 static int rsd_read_header(AVFormatContext *s)
 {
     AVIOContext *pb = s->pb;

     int i, ret, version, start = 0x800;

     AVCodecParameters *par;

     AVStream *st = avformat_new_stream(s, NULL);
 
     if (!st)
         return AVERROR(ENOMEM);
 
     avio_skip(pb, 3); // "RSD"
     version = avio_r8(pb) - '0';
 

     par = st->codecpar;
     par->codec_type = AVMEDIA_TYPE_AUDIO;
     par->codec_tag  = avio_rl32(pb);
     par->codec_id   = ff_codec_get_id(rsd_tags, par->codec_tag);
     if (!par->codec_id) {

         const char *tag_buf = av_fourcc2str(par->codec_tag);

         for (i=0; i < FF_ARRAY_ELEMS(rsd_unsupported_tags); i++) {

             if (par->codec_tag == rsd_unsupported_tags[i]) {

                 avpriv_request_sample(s, "Codec tag: %s", tag_buf);
                 return AVERROR_PATCHWELCOME;
             }
         }
         av_log(s, AV_LOG_ERROR, "Unknown codec tag: %s\n", tag_buf);
         return AVERROR_INVALIDDATA;
     }
 

     par->channels = avio_rl32(pb);

     if (par->channels <= 0 || par->channels > INT_MAX / 36) {
         av_log(s, AV_LOG_ERROR, "Invalid number of channels: %d\n", par->channels);

         return AVERROR_INVALIDDATA;

     }

 
     avio_skip(pb, 4); // Bit depth

     par->sample_rate = avio_rl32(pb);
     if (!par->sample_rate)

         return AVERROR_INVALIDDATA;
 
     avio_skip(pb, 4); // Unknown
 

     switch (par->codec_id) {

     case AV_CODEC_ID_XMA2:

         par->block_align = 2048;

         if ((ret = ff_alloc_extradata(par, 34)) < 0)
             return ret;

         memset(par->extradata, 0, 34);

         break;

     case AV_CODEC_ID_ADPCM_PSX:

         par->block_align = 16 * par->channels;

         if (pb->seekable & AVIO_SEEKABLE_NORMAL)

             st->duration = av_get_audio_frame_duration2(par, avio_size(pb) - start);

         break;

     case AV_CODEC_ID_ADPCM_IMA_RAD:

         par->block_align = 20 * par->channels;

         if (pb->seekable & AVIO_SEEKABLE_NORMAL)

             st->duration = av_get_audio_frame_duration2(par, avio_size(pb) - start);

         break;

     case AV_CODEC_ID_ADPCM_IMA_WAV:
         if (version == 2)
             start = avio_rl32(pb);
 

         par->bits_per_coded_sample = 4;
         par->block_align = 36 * par->channels;

         if (pb->seekable & AVIO_SEEKABLE_NORMAL)

             st->duration = av_get_audio_frame_duration2(par, avio_size(pb) - start);

         break;

     case AV_CODEC_ID_ADPCM_THP_LE:

         /* RSD3GADP is mono, so only alloc enough memory
            to store the coeff table for a single channel. */

         start = avio_rl32(pb);

         if ((ret = ff_get_extradata(s, par, s->pb, 32)) < 0)

             return ret;

         if (pb->seekable & AVIO_SEEKABLE_NORMAL)

             st->duration = av_get_audio_frame_duration2(par, avio_size(pb) - start);

         break;
     case AV_CODEC_ID_ADPCM_THP:

         par->block_align = 8 * par->channels;

         avio_skip(s->pb, 0x1A4 - avio_tell(s->pb));

         if ((ret = ff_alloc_extradata(st->codecpar, 32 * par->channels)) < 0)

             return ret;

         for (i = 0; i < par->channels; i++) {
             avio_read(s->pb, st->codecpar->extradata + 32 * i, 32);

             avio_skip(s->pb, 8);
         }

         if (pb->seekable & AVIO_SEEKABLE_NORMAL)

             st->duration = (avio_size(pb) - start) / (8 * par->channels) * 14;

         break;
     case AV_CODEC_ID_PCM_S16LE:
     case AV_CODEC_ID_PCM_S16BE:
         if (version != 4)
             start = avio_rl32(pb);
 

         if (pb->seekable & AVIO_SEEKABLE_NORMAL)

             st->duration = (avio_size(pb) - start) / 2 / par->channels;

         break;
     }
 
     avio_skip(pb, start - avio_tell(pb));

     if (par->codec_id == AV_CODEC_ID_XMA2) {

         avio_skip(pb, avio_rb32(pb) + avio_rb32(pb));
         st->duration = avio_rb32(pb);
     }

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

 
     return 0;
 }
 
 static int rsd_read_packet(AVFormatContext *s, AVPacket *pkt)
 {

     AVCodecParameters *par = s->streams[0]->codecpar;

     int ret, size = 1024;

     int64_t pos;

     if (avio_feof(s->pb))

         return AVERROR_EOF;
 

     pos = avio_tell(s->pb);

     if (par->codec_id == AV_CODEC_ID_ADPCM_IMA_RAD ||
         par->codec_id == AV_CODEC_ID_ADPCM_PSX     ||
         par->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV ||
         par->codec_id == AV_CODEC_ID_XMA2) {
         ret = av_get_packet(s->pb, pkt, par->block_align);
     } else if (par->codec_tag == MKTAG('W','A','D','P') &&
                par->channels > 1) {

         int i, ch;
 

         ret = av_new_packet(pkt, par->block_align);

         if (ret < 0)
             return ret;

         for (i = 0; i < 4; i++) {

             for (ch = 0; ch < par->channels; ch++) {

                 pkt->data[ch * 8 + i * 2 + 0] = avio_r8(s->pb);
                 pkt->data[ch * 8 + i * 2 + 1] = avio_r8(s->pb);
             }

         }

         ret = 0;
     } else {
         ret = av_get_packet(s->pb, pkt, size);

     }

     if (par->codec_id == AV_CODEC_ID_XMA2 && pkt->size >= 1)

         pkt->duration = (pkt->data[0] >> 2) * 512;
 
     pkt->pos = pos;

     pkt->stream_index = 0;
 
     return ret;
 }
 
 AVInputFormat ff_rsd_demuxer = {
     .name           =   "rsd",
     .long_name      =   NULL_IF_CONFIG_SMALL("GameCube RSD"),
     .read_probe     =   rsd_probe,
     .read_header    =   rsd_read_header,
     .read_packet    =   rsd_read_packet,
     .extensions     =   "rsd",
     .codec_tag      =   (const AVCodecTag* const []){rsd_tags, 0},

     .flags          =   AVFMT_GENERIC_INDEX,

 };