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
34typedef struct {
35  unsigned int channels;
36  unsigned int audio_pts;
37} CdataDemuxContext;
38
39static 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
48static 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
85static 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
97AVInputFormat 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