2 * Electronic Arts .cdata file Demuxer
3 * Copyright (c) 2007 Peter Ross
5 * This file is part of FFmpeg.
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.
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.
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
24 * Electronic Arts cdata Format Demuxer
25 * by Peter Ross (pross@xvid.org)
27 * Technical details here:
28 * http://wiki.multimedia.cx/index.php?title=EA_Command_And_Conquer_3_Audio_Codec
34 unsigned int channels;
35 unsigned int audio_pts;
38 static int cdata_probe(AVProbeData *p)
40 const uint8_t *b = p->buf;
42 if (b[0] == 0x04 && (b[1] == 0x00 || b[1] == 0x04 || b[1] == 0x0C))
43 return AVPROBE_SCORE_MAX/8;
47 static int cdata_read_header(AVFormatContext *s, AVFormatParameters *ap)
49 CdataDemuxContext *cdata = s->priv_data;
50 ByteIOContext *pb = s->pb;
51 unsigned int sample_rate, header;
54 header = get_be16(pb);
56 case 0x0400: cdata->channels = 1; break;
57 case 0x0404: cdata->channels = 2; break;
58 case 0x040C: cdata->channels = 4; break;
60 av_log(s, AV_LOG_INFO, "unknown header 0x%04x\n", header);
64 sample_rate = get_be16(pb);
67 st = av_new_stream(s, 0);
69 return AVERROR(ENOMEM);
70 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
71 st->codec->codec_tag = 0; /* no fourcc */
72 st->codec->codec_id = CODEC_ID_ADPCM_EA_XAS;
73 st->codec->channels = cdata->channels;
74 st->codec->sample_rate = sample_rate;
75 av_set_pts_info(st, 64, 1, sample_rate);
81 static int cdata_read_packet(AVFormatContext *s, AVPacket *pkt)
83 CdataDemuxContext *cdata = s->priv_data;
84 int packet_size = 76*cdata->channels;
86 int ret = av_get_packet(s->pb, pkt, packet_size);
89 pkt->pts = cdata->audio_pts++;
93 AVInputFormat ff_ea_cdata_demuxer = {
95 NULL_IF_CONFIG_SMALL("Electronic Arts cdata"),
96 sizeof(CdataDemuxContext),
100 .extensions = "cdata",