Statistics
| Branch: | Revision:

ffmpeg / libavformat / electronicarts.c @ 25f8db58

History | View | Annotate | Download (8.08 KB)

1
/* Electronic Arts Multimedia File Demuxer
2
 * Copyright (c) 2004  The ffmpeg Project
3
 *
4
 * This library is free software; you can redistribute it and/or
5
 * modify it under the terms of the GNU Lesser General Public
6
 * License as published by the Free Software Foundation; either
7
 * version 2 of the License, or (at your option) any later version.
8
 *
9
 * This library is distributed in the hope that it will be useful,
10
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12
 * Lesser General Public License for more details.
13
 *
14
 * You should have received a copy of the GNU Lesser General Public
15
 * License along with this library; if not, write to the Free Software
16
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
17
 */
18

    
19
/**
20
 * @file electronicarts.c
21
 * Electronic Arts Multimedia file demuxer (WVE/UV2/etc.)
22
 * by Robin Kay (komadori at gekkou.co.uk)
23
 */
24

    
25
#include "avformat.h"
26

    
27
#define SCHl_TAG MKTAG('S', 'C', 'H', 'l')
28
#define PT00_TAG MKTAG('P', 'T', 0x0, 0x0)
29
#define SCDl_TAG MKTAG('S', 'C', 'D', 'l')
30
#define pIQT_TAG MKTAG('p', 'I', 'Q', 'T')
31
#define SCEl_TAG MKTAG('S', 'C', 'E', 'l')
32
#define _TAG MKTAG('', '', '', '')
33

    
34
#define EA_SAMPLE_RATE 22050
35
#define EA_BITS_PER_SAMPLE 16
36
#define EA_PREAMBLE_SIZE 8
37

    
38
typedef struct EaDemuxContext {
39
    int width;
40
    int height;
41
    int video_stream_index;
42
    int track_count;
43

    
44
    int audio_stream_index;
45
    int audio_frame_counter;
46

    
47
    int64_t audio_pts;
48
    int64_t video_pts;
49
    int video_pts_inc;
50
    float fps;
51

    
52
    int num_channels;
53
    int num_samples;
54
    int compression_type;
55
} EaDemuxContext;
56

    
57
static uint32_t read_arbitary(ByteIOContext *pb) {
58
    uint8_t size, byte;
59
    int i;
60
    uint32_t word;
61

    
62
    size = get_byte(pb);
63

    
64
    word = 0;
65
    for (i = 0; i < size; i++) {
66
        byte = get_byte(pb);
67
        word <<= 8;
68
        word |= byte;
69
    }
70

    
71
    return word;
72
}
73

    
74
/*
75
 * Process WVE file header
76
 * Returns 1 if the WVE file is valid and successfully opened, 0 otherwise
77
 */
78
static int process_ea_header(AVFormatContext *s) {
79
    int inHeader;
80
    uint32_t blockid, size;
81
    EaDemuxContext *ea = (EaDemuxContext *)s->priv_data;
82
    ByteIOContext *pb = &s->pb;
83

    
84
    if (get_buffer(pb, (void*)&blockid, 4) != 4) {
85
        return 0;
86
    }
87
    if (le2me_32(blockid) != SCHl_TAG) {
88
        return 0;
89
    }
90

    
91
    if (get_buffer(pb, (void*)&size, 4) != 4) {
92
        return 0;
93
    }
94
    size = le2me_32(size);
95

    
96
    if (get_buffer(pb, (void*)&blockid, 4) != 4) {
97
        return 0;
98
    }
99
    if (le2me_32(blockid) != PT00_TAG) {
100
        av_log (s, AV_LOG_ERROR, "PT header missing\n");
101
        return 0;
102
    }
103

    
104
    inHeader = 1;
105
    while (inHeader) {
106
        int inSubheader;
107
        uint8_t byte;
108
        byte = get_byte(pb) & 0xFF;
109

    
110
        switch (byte) {
111
        case 0xFD:
112
            av_log (s, AV_LOG_INFO, "entered audio subheader\n");
113
            inSubheader = 1;
114
            while (inSubheader) {
115
                uint8_t subbyte;
116
                subbyte = get_byte(pb) & 0xFF;
117

    
118
                switch (subbyte) {
119
                case 0x82:
120
                    ea->num_channels = read_arbitary(pb);
121
                    av_log (s, AV_LOG_INFO, "num_channels (element 0x82) set to 0x%08x\n", ea->num_channels);
122
                    break;
123
                case 0x83:
124
                    ea->compression_type = read_arbitary(pb);
125
                    av_log (s, AV_LOG_INFO, "compression_type (element 0x83) set to 0x%08x\n", ea->compression_type);
126
                    break;
127
                case 0x85:
128
                    ea->num_samples = read_arbitary(pb);
129
                    av_log (s, AV_LOG_INFO, "num_samples (element 0x85) set to 0x%08x\n", ea->num_samples);
130
                    break;
131
                case 0x8A:
132
                    av_log (s, AV_LOG_INFO, "element 0x%02x set to 0x%08x\n", subbyte, read_arbitary(pb));
133
                    av_log (s, AV_LOG_INFO, "exited audio subheader\n");
134
                    inSubheader = 0;
135
                    break;
136
                default:
137
                    av_log (s, AV_LOG_INFO, "element 0x%02x set to 0x%08x\n", subbyte, read_arbitary(pb));
138
                    break;
139
                }
140
            }
141
            break;
142
        case 0xFF:
143
            av_log (s, AV_LOG_INFO, "end of header block reached\n");
144
            inHeader = 0;
145
            break;
146
        default:
147
            av_log (s, AV_LOG_INFO, "header element 0x%02x set to 0x%08x\n", byte, read_arbitary(pb));
148
            break;
149
        }
150
    }
151

    
152
    if ((ea->num_channels != 2) || (ea->compression_type != 7)) {
153
        av_log (s, AV_LOG_ERROR, "unsupported stream type\n");
154
        return 0;
155
    }
156

    
157
    /* skip to the start of the data */
158
    url_fseek(pb, size, SEEK_SET);
159

    
160
    return 1;
161
}
162

    
163

    
164
static int ea_probe(AVProbeData *p)
165
{
166
    if (p->buf_size < 4)
167
        return 0;
168

    
169
    if (LE_32(&p->buf[0]) != SCHl_TAG)
170
        return 0;
171

    
172
    return AVPROBE_SCORE_MAX;
173
}
174

    
175
static int ea_read_header(AVFormatContext *s,
176
                          AVFormatParameters *ap)
177
{
178
    EaDemuxContext *ea = (EaDemuxContext *)s->priv_data;
179
    AVStream *st;
180

    
181
    if (!process_ea_header(s))
182
        return AVERROR_IO;
183

    
184
#if 0
185
    /* initialize the video decoder stream */
186
    st = av_new_stream(s, 0);
187
    if (!st)
188
        return AVERROR_NOMEM;
189
    av_set_pts_info(st, 33, 1, 90000);
190
    ea->video_stream_index = st->index;
191
    st->codec->codec_type = CODEC_TYPE_VIDEO;
192
    st->codec->codec_id = CODEC_ID_EA_MJPEG;
193
    st->codec->codec_tag = 0;  /* no fourcc */
194
#endif    
195

    
196
    /* initialize the audio decoder stream */
197
    st = av_new_stream(s, 0);
198
    if (!st)
199
        return AVERROR_NOMEM;
200
    av_set_pts_info(st, 33, 1, EA_SAMPLE_RATE);
201
    st->codec->codec_type = CODEC_TYPE_AUDIO;
202
    st->codec->codec_id = CODEC_ID_ADPCM_EA;
203
    st->codec->codec_tag = 0;  /* no tag */
204
    st->codec->channels = ea->num_channels;
205
    st->codec->sample_rate = EA_SAMPLE_RATE;
206
    st->codec->bits_per_sample = EA_BITS_PER_SAMPLE;
207
    st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
208
        st->codec->bits_per_sample / 4;
209
    st->codec->block_align = st->codec->channels * st->codec->bits_per_sample;
210

    
211
    ea->audio_stream_index = st->index;
212
    ea->audio_frame_counter = 0;
213

    
214
    return 1;
215
}
216

    
217
static int ea_read_packet(AVFormatContext *s,
218
                          AVPacket *pkt)
219
{
220
    EaDemuxContext *ea = s->priv_data;
221
    ByteIOContext *pb = &s->pb;
222
    int ret = 0;
223
    int packet_read = 0;
224
    unsigned char preamble[EA_PREAMBLE_SIZE];
225
    unsigned int chunk_type, chunk_size;
226

    
227
    while (!packet_read) {
228

    
229
        if (get_buffer(pb, preamble, EA_PREAMBLE_SIZE) != EA_PREAMBLE_SIZE)
230
            return AVERROR_IO;
231
        chunk_type = LE_32(&preamble[0]);
232
        chunk_size = LE_32(&preamble[4]) - EA_PREAMBLE_SIZE;
233

    
234
        switch (chunk_type) {
235
        /* audio data */
236
        case SCDl_TAG:
237
            ret = av_get_packet(pb, pkt, chunk_size);
238
            if (ret != chunk_size)
239
                ret = AVERROR_IO;
240
            else {
241
                    pkt->stream_index = ea->audio_stream_index;
242
                    pkt->pts = 90000;
243
                    pkt->pts *= ea->audio_frame_counter;
244
                    pkt->pts /= EA_SAMPLE_RATE;
245

    
246
                    /* 2 samples/byte, 1 or 2 samples per frame depending 
247
                     * on stereo; chunk also has 12-byte header */
248
                    ea->audio_frame_counter += ((chunk_size - 12) * 2) /
249
                        ea->num_channels;
250
            }
251

    
252
            packet_read = 1;
253
            break;
254

    
255
        /* ending tag */
256
        case SCEl_TAG:
257
            ret = AVERROR_IO;
258
            packet_read = 1;
259
            break;
260

    
261
        default:
262
            url_fseek(pb, chunk_size, SEEK_CUR);
263
            break;
264
        }
265

    
266
        /* ending packet */
267
        if (chunk_type == SCEl_TAG) {
268
        }
269
    }
270

    
271
    return ret;
272
}
273

    
274
static int ea_read_close(AVFormatContext *s)
275
{
276
//    EaDemuxContext *ea = (EaDemuxContext *)s->priv_data;
277

    
278
    return 0;
279
}
280

    
281
static AVInputFormat ea_iformat = {
282
    "ea",
283
    "Electronic Arts Multimedia Format",
284
    sizeof(EaDemuxContext),
285
    ea_probe,
286
    ea_read_header,
287
    ea_read_packet,
288
    ea_read_close,
289
};
290

    
291
int ea_init(void)
292
{
293
    av_register_input_format(&ea_iformat);
294
    return 0;
295
}