blob: 97eb66e36d580c542d64a210d34a12b418e0a7ff
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 | |
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->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 | |
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 |