yading@11: /*
yading@11:  * Electronic Arts .cdata file Demuxer
yading@11:  * Copyright (c) 2007 Peter Ross
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * Electronic Arts cdata Format Demuxer
yading@11:  * by Peter Ross (pross@xvid.org)
yading@11:  *
yading@11:  * Technical details here:
yading@11:  *  http://wiki.multimedia.cx/index.php?title=EA_Command_And_Conquer_3_Audio_Codec
yading@11:  */
yading@11: 
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: 
yading@11: typedef struct {
yading@11:   unsigned int channels;
yading@11:   unsigned int audio_pts;
yading@11: } CdataDemuxContext;
yading@11: 
yading@11: static int cdata_probe(AVProbeData *p)
yading@11: {
yading@11:     const uint8_t *b = p->buf;
yading@11: 
yading@11:     if (b[0] == 0x04 && (b[1] == 0x00 || b[1] == 0x04 || b[1] == 0x0C || b[1] == 0x14))
yading@11:         return AVPROBE_SCORE_MAX/8;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int cdata_read_header(AVFormatContext *s)
yading@11: {
yading@11:     CdataDemuxContext *cdata = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     unsigned int sample_rate, header;
yading@11:     AVStream *st;
yading@11:     int64_t channel_layout = 0;
yading@11: 
yading@11:     header = avio_rb16(pb);
yading@11:     switch (header) {
yading@11:         case 0x0400: cdata->channels = 1; break;
yading@11:         case 0x0404: cdata->channels = 2; break;
yading@11:         case 0x040C: cdata->channels = 4; channel_layout = AV_CH_LAYOUT_QUAD;         break;
yading@11:         case 0x0414: cdata->channels = 6; channel_layout = AV_CH_LAYOUT_5POINT1_BACK; break;
yading@11:         default:
yading@11:             av_log(s, AV_LOG_INFO, "unknown header 0x%04x\n", header);
yading@11:             return -1;
yading@11:     };
yading@11: 
yading@11:     sample_rate = avio_rb16(pb);
yading@11:     avio_skip(pb, (avio_r8(pb) & 0x20) ? 15 : 11);
yading@11: 
yading@11:     st = avformat_new_stream(s, NULL);
yading@11:     if (!st)
yading@11:         return AVERROR(ENOMEM);
yading@11:     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
yading@11:     st->codec->codec_tag = 0; /* no fourcc */
yading@11:     st->codec->codec_id = AV_CODEC_ID_ADPCM_EA_XAS;
yading@11:     st->codec->channels = cdata->channels;
yading@11:     st->codec->channel_layout = channel_layout;
yading@11:     st->codec->sample_rate = sample_rate;
yading@11:     avpriv_set_pts_info(st, 64, 1, sample_rate);
yading@11: 
yading@11:     cdata->audio_pts = 0;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int cdata_read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     CdataDemuxContext *cdata = s->priv_data;
yading@11:     int packet_size = 76*cdata->channels;
yading@11: 
yading@11:     int ret = av_get_packet(s->pb, pkt, packet_size);
yading@11:     if (ret < 0)
yading@11:         return ret;
yading@11:     pkt->pts = cdata->audio_pts++;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_ea_cdata_demuxer = {
yading@11:     .name           = "ea_cdata",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts cdata"),
yading@11:     .priv_data_size = sizeof(CdataDemuxContext),
yading@11:     .read_probe     = cdata_probe,
yading@11:     .read_header    = cdata_read_header,
yading@11:     .read_packet    = cdata_read_packet,
yading@11:     .extensions = "cdata",
yading@11: };