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  1. /*
  2.  * RSD demuxer
  3.  * Copyright (c) 2013 James Almer
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "libavcodec/bytestream.h"
  23. #include "libavutil/intreadwrite.h"
  24. #include "avformat.h"
  25. #include "avio.h"
  26. #include "internal.h"
  27.  
  28. static const AVCodecTag rsd_tags[] = {
  29.     { AV_CODEC_ID_ADPCM_THP,       MKTAG('G','A','D','P') },
  30.     { AV_CODEC_ID_ADPCM_IMA_RAD,   MKTAG('R','A','D','P') },
  31.     { AV_CODEC_ID_PCM_S16BE,       MKTAG('P','C','M','B') },
  32.     { AV_CODEC_ID_PCM_S16LE,       MKTAG('P','C','M',' ') },
  33.     { AV_CODEC_ID_NONE, 0 },
  34. };
  35.  
  36. static const uint32_t rsd_unsupported_tags[] = {
  37.     MKTAG('O','G','G',' '),
  38.     MKTAG('V','A','G',' '),
  39.     MKTAG('W','A','D','P'),
  40.     MKTAG('X','A','D','P'),
  41.     MKTAG('X','M','A',' '),
  42. };
  43.  
  44. static int rsd_probe(AVProbeData *p)
  45. {
  46.     if (!memcmp(p->buf, "RSD", 3) &&
  47.         p->buf[3] - '0' >= 2 && p->buf[3] - '0' <= 6)
  48.         return AVPROBE_SCORE_EXTENSION;
  49.     return 0;
  50. }
  51.  
  52. static int rsd_read_header(AVFormatContext *s)
  53. {
  54.     AVIOContext *pb = s->pb;
  55.     int i, version, start = 0x800;
  56.     AVCodecContext *codec;
  57.     AVStream *st = avformat_new_stream(s, NULL);
  58.  
  59.     if (!st)
  60.         return AVERROR(ENOMEM);
  61.  
  62.     avio_skip(pb, 3); // "RSD"
  63.     version = avio_r8(pb) - '0';
  64.  
  65.     codec = st->codec;
  66.     codec->codec_type = AVMEDIA_TYPE_AUDIO;
  67.     codec->codec_tag  = avio_rl32(pb);
  68.     codec->codec_id   = ff_codec_get_id(rsd_tags, codec->codec_tag);
  69.     if (!codec->codec_id) {
  70.         char tag_buf[5];
  71.  
  72.         av_get_codec_tag_string(tag_buf, sizeof(tag_buf), codec->codec_tag);
  73.         for (i=0; i < FF_ARRAY_ELEMS(rsd_unsupported_tags); i++) {
  74.             if (codec->codec_tag == rsd_unsupported_tags[i]) {
  75.                 avpriv_request_sample(s, "Codec tag: %s", tag_buf);
  76.                 return AVERROR_PATCHWELCOME;
  77.             }
  78.         }
  79.         av_log(s, AV_LOG_ERROR, "Unknown codec tag: %s\n", tag_buf);
  80.         return AVERROR_INVALIDDATA;
  81.     }
  82.  
  83.     codec->channels = avio_rl32(pb);
  84.     if (!codec->channels)
  85.         return AVERROR_INVALIDDATA;
  86.  
  87.     avio_skip(pb, 4); // Bit depth
  88.     codec->sample_rate = avio_rl32(pb);
  89.     if (!codec->sample_rate)
  90.         return AVERROR_INVALIDDATA;
  91.  
  92.     avio_skip(pb, 4); // Unknown
  93.  
  94.     switch (codec->codec_id) {
  95.     case AV_CODEC_ID_ADPCM_IMA_RAD:
  96.         codec->block_align = 20 * codec->channels;
  97.         if (pb->seekable)
  98.             st->duration = av_get_audio_frame_duration(codec, avio_size(pb) - start);
  99.         break;
  100.     case AV_CODEC_ID_ADPCM_THP:
  101.         /* RSD3GADP is mono, so only alloc enough memory
  102.            to store the coeff table for a single channel. */
  103.  
  104.         if (ff_alloc_extradata(codec, 32))
  105.             return AVERROR(ENOMEM);
  106.  
  107.         start = avio_rl32(pb);
  108.  
  109.         if (avio_read(s->pb, codec->extradata, 32) != 32)
  110.             return AVERROR_INVALIDDATA;
  111.  
  112.         for (i = 0; i < 16; i++)
  113.             AV_WB16(codec->extradata + i * 2, AV_RL16(codec->extradata + i * 2));
  114.  
  115.         if (pb->seekable)
  116.             st->duration = (avio_size(pb) - start) / 8 * 14;
  117.         break;
  118.     case AV_CODEC_ID_PCM_S16LE:
  119.     case AV_CODEC_ID_PCM_S16BE:
  120.         if (version != 4)
  121.             start = avio_rl32(pb);
  122.  
  123.         if (pb->seekable)
  124.             st->duration = (avio_size(pb) - start) / 2 / codec->channels;
  125.         break;
  126.     }
  127.  
  128.     avio_skip(pb, start - avio_tell(pb));
  129.  
  130.     avpriv_set_pts_info(st, 64, 1, codec->sample_rate);
  131.  
  132.     return 0;
  133. }
  134.  
  135. static int rsd_read_packet(AVFormatContext *s, AVPacket *pkt)
  136. {
  137.     AVCodecContext *codec = s->streams[0]->codec;
  138.     int ret, size = 1024;
  139.  
  140.     if (url_feof(s->pb))
  141.         return AVERROR_EOF;
  142.  
  143.     if (codec->codec_id == AV_CODEC_ID_ADPCM_IMA_RAD)
  144.         ret = av_get_packet(s->pb, pkt, codec->block_align);
  145.     else
  146.         ret = av_get_packet(s->pb, pkt, size);
  147.  
  148.     if (ret != size) {
  149.         if (ret < 0) {
  150.             av_free_packet(pkt);
  151.             return ret;
  152.         }
  153.         av_shrink_packet(pkt, ret);
  154.     }
  155.     pkt->stream_index = 0;
  156.  
  157.     return ret;
  158. }
  159.  
  160. AVInputFormat ff_rsd_demuxer = {
  161.     .name           =   "rsd",
  162.     .long_name      =   NULL_IF_CONFIG_SMALL("GameCube RSD"),
  163.     .read_probe     =   rsd_probe,
  164.     .read_header    =   rsd_read_header,
  165.     .read_packet    =   rsd_read_packet,
  166.     .extensions     =   "rsd",
  167.     .codec_tag      =   (const AVCodecTag* const []){rsd_tags, 0},
  168. };
  169.