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 CdataDemuxContext {
35 unsigned int channels;
36 unsigned int audio_pts;
37 } CdataDemuxContext;
38
cdata_probe(const AVProbeData * p)39 static int cdata_probe(const 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
cdata_read_header(AVFormatContext * s)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->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
74 st->codecpar->codec_tag = 0; /* no fourcc */
75 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_EA_XAS;
76 st->codecpar->channels = cdata->channels;
77 st->codecpar->channel_layout = channel_layout;
78 st->codecpar->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
cdata_read_packet(AVFormatContext * s,AVPacket * pkt)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