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  1. /*
  2.  * Electronic Arts .cdata file Demuxer
  3.  * Copyright (c) 2007 Peter Ross
  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. /**
  23.  * @file
  24.  * Electronic Arts cdata Format Demuxer
  25.  * by Peter Ross (pross@xvid.org)
  26.  *
  27.  * Technical details here:
  28.  *  http://wiki.multimedia.cx/index.php?title=EA_Command_And_Conquer_3_Audio_Codec
  29.  */
  30.  
  31. #include "avformat.h"
  32. #include "internal.h"
  33.  
  34. typedef struct {
  35.   unsigned int channels;
  36.   unsigned int audio_pts;
  37. } CdataDemuxContext;
  38.  
  39. static int cdata_probe(AVProbeData *p)
  40. {
  41.     const uint8_t *b = p->buf;
  42.  
  43.     if (b[0] == 0x04 && (b[1] == 0x00 || b[1] == 0x04 || b[1] == 0x0C || b[1] == 0x14))
  44.         return AVPROBE_SCORE_MAX/8;
  45.     return 0;
  46. }
  47.  
  48. static int cdata_read_header(AVFormatContext *s)
  49. {
  50.     CdataDemuxContext *cdata = s->priv_data;
  51.     AVIOContext *pb = s->pb;
  52.     unsigned int sample_rate, header;
  53.     AVStream *st;
  54.     int64_t channel_layout = 0;
  55.  
  56.     header = avio_rb16(pb);
  57.     switch (header) {
  58.         case 0x0400: cdata->channels = 1; break;
  59.         case 0x0404: cdata->channels = 2; break;
  60.         case 0x040C: cdata->channels = 4; channel_layout = AV_CH_LAYOUT_QUAD;         break;
  61.         case 0x0414: cdata->channels = 6; channel_layout = AV_CH_LAYOUT_5POINT1_BACK; break;
  62.         default:
  63.             av_log(s, AV_LOG_INFO, "unknown header 0x%04x\n", header);
  64.             return -1;
  65.     };
  66.  
  67.     sample_rate = avio_rb16(pb);
  68.     avio_skip(pb, (avio_r8(pb) & 0x20) ? 15 : 11);
  69.  
  70.     st = avformat_new_stream(s, NULL);
  71.     if (!st)
  72.         return AVERROR(ENOMEM);
  73.     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  74.     st->codec->codec_tag = 0; /* no fourcc */
  75.     st->codec->codec_id = AV_CODEC_ID_ADPCM_EA_XAS;
  76.     st->codec->channels = cdata->channels;
  77.     st->codec->channel_layout = channel_layout;
  78.     st->codec->sample_rate = sample_rate;
  79.     avpriv_set_pts_info(st, 64, 1, sample_rate);
  80.  
  81.     cdata->audio_pts = 0;
  82.     return 0;
  83. }
  84.  
  85. static int cdata_read_packet(AVFormatContext *s, AVPacket *pkt)
  86. {
  87.     CdataDemuxContext *cdata = s->priv_data;
  88.     int packet_size = 76*cdata->channels;
  89.  
  90.     int ret = av_get_packet(s->pb, pkt, packet_size);
  91.     if (ret < 0)
  92.         return ret;
  93.     pkt->pts = cdata->audio_pts++;
  94.     return 0;
  95. }
  96.  
  97. AVInputFormat ff_ea_cdata_demuxer = {
  98.     .name           = "ea_cdata",
  99.     .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts cdata"),
  100.     .priv_data_size = sizeof(CdataDemuxContext),
  101.     .read_probe     = cdata_probe,
  102.     .read_header    = cdata_read_header,
  103.     .read_packet    = cdata_read_packet,
  104.     .extensions = "cdata",
  105. };
  106.