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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 "libavutil/channel_layout.h"
32 #include "avformat.h"
33 #include "internal.h"
34 
35 #include "libavutil/channel_layout.h"
36 
37 typedef struct CdataDemuxContext {
38   unsigned int channels;
39   unsigned int audio_pts;
40 } CdataDemuxContext;
41 
cdata_probe(const AVProbeData * p)42 static int cdata_probe(const AVProbeData *p)
43 {
44     const uint8_t *b = p->buf;
45 
46     if (b[0] == 0x04 && (b[1] == 0x00 || b[1] == 0x04 || b[1] == 0x0C || b[1] == 0x14))
47         return AVPROBE_SCORE_MAX/8;
48     return 0;
49 }
50 
cdata_read_header(AVFormatContext * s)51 static int cdata_read_header(AVFormatContext *s)
52 {
53     CdataDemuxContext *cdata = s->priv_data;
54     AVIOContext *pb = s->pb;
55     unsigned int sample_rate, header;
56     AVStream *st;
57     AVChannelLayout channel_layout;
58 
59     header = avio_rb16(pb);
60     switch (header) {
61         case 0x0400:
62             channel_layout = (AVChannelLayout){ .nb_channels = 1, .order = AV_CHANNEL_ORDER_UNSPEC };
63             break;
64         case 0x0404:
65             channel_layout  = (AVChannelLayout){ .nb_channels = 2, .order = AV_CHANNEL_ORDER_UNSPEC };
66             break;
67         case 0x040C:
68             channel_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_QUAD;         break;
69         case 0x0414:
70             channel_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_5POINT1_BACK; break;
71         default:
72             av_log(s, AV_LOG_INFO, "unknown header 0x%04x\n", header);
73             return -1;
74     };
75     cdata->channels = channel_layout.nb_channels;
76 
77     sample_rate = avio_rb16(pb);
78     avio_skip(pb, (avio_r8(pb) & 0x20) ? 15 : 11);
79 
80     st = avformat_new_stream(s, NULL);
81     if (!st)
82         return AVERROR(ENOMEM);
83     st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
84     st->codecpar->codec_tag = 0; /* no fourcc */
85     st->codecpar->codec_id = AV_CODEC_ID_ADPCM_EA_XAS;
86     st->codecpar->ch_layout = channel_layout;
87     st->codecpar->sample_rate = sample_rate;
88     avpriv_set_pts_info(st, 64, 1, sample_rate);
89 
90     cdata->audio_pts = 0;
91     return 0;
92 }
93 
cdata_read_packet(AVFormatContext * s,AVPacket * pkt)94 static int cdata_read_packet(AVFormatContext *s, AVPacket *pkt)
95 {
96     CdataDemuxContext *cdata = s->priv_data;
97     int packet_size = 76*cdata->channels;
98 
99     int ret = av_get_packet(s->pb, pkt, packet_size);
100     if (ret < 0)
101         return ret;
102     pkt->pts = cdata->audio_pts++;
103     return 0;
104 }
105 
106 const AVInputFormat ff_ea_cdata_demuxer = {
107     .name           = "ea_cdata",
108     .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts cdata"),
109     .priv_data_size = sizeof(CdataDemuxContext),
110     .read_probe     = cdata_probe,
111     .read_header    = cdata_read_header,
112     .read_packet    = cdata_read_packet,
113     .extensions = "cdata",
114 };
115