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source: vbox/trunk/src/libs/ffmpeg-20060710/libavformat/electronicarts.c@ 7692

Last change on this file since 7692 was 5776, checked in by vboxsync, 17 years ago

ffmpeg: exported to OSE
File size: 8.1 KB
Line 
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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
38typedef 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
57static 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 */
78static 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
164static 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
175static 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
217static 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
274static int ea_read_close(AVFormatContext *s)
275{
276// EaDemuxContext *ea = (EaDemuxContext *)s->priv_data;
277
278 return 0;
279}
280
281static AVInputFormat ea_demuxer = {
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
291int ea_init(void)
292{
293 av_register_input_format(&ea_demuxer);
294 return 0;
295}
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