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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 { | |
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->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 | ||
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 | }; |