[6ec3fb]: src / demuxers / demux_wc3movie.c  Maximize  Restore  History

Download this file

759 lines (634 with data), 24.2 kB

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
/*
* Copyright (C) 2000-2003 the xine project
*
* This file is part of xine, a free video player.
*
* xine is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* xine is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
*/
/*
* File Demuxer for Wing Commander III MVE movie files
* by Mike Melanson (melanson@pcisys.net)
* For more information on the MVE file format, visit:
* http://www.pcisys.net/~melanson/codecs/
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
/********** logging **********/
#define LOG_MODULE "demux_wc3movie"
#define LOG_VERBOSE
/*
#define LOG
*/
#include "xine_internal.h"
#include "xineutils.h"
#include "compat.h"
#include "demux.h"
#include "bswap.h"
#include "group_games.h"
#define FOURCC_TAG BE_FOURCC
#define FORM_TAG FOURCC_TAG('F', 'O', 'R', 'M')
#define MOVE_TAG FOURCC_TAG('M', 'O', 'V', 'E')
#define PC_TAG FOURCC_TAG('_', 'P', 'C', '_')
#define SOND_TAG FOURCC_TAG('S', 'O', 'N', 'D')
#define PALT_TAG FOURCC_TAG('P', 'A', 'L', 'T')
#define INDX_TAG FOURCC_TAG('I', 'N', 'D', 'X')
#define BNAM_TAG FOURCC_TAG('B', 'N', 'A', 'M')
#define SIZE_TAG FOURCC_TAG('S', 'I', 'Z', 'E')
#define BRCH_TAG FOURCC_TAG('B', 'R', 'C', 'H')
#define SHOT_TAG FOURCC_TAG('S', 'H', 'O', 'T')
#define VGA_TAG FOURCC_TAG('V', 'G', 'A', ' ')
#define AUDI_TAG FOURCC_TAG('A', 'U', 'D', 'I')
#define TEXT_TAG FOURCC_TAG('T', 'E', 'X', 'T')
#define PALETTE_SIZE 256
#define PALETTE_CHUNK_SIZE (PALETTE_SIZE * 3)
#define WC3_FRAMERATE 15
#define WC3_PTS_INC (90000 / 15)
#define WC3_USUAL_WIDTH 320
#define WC3_USUAL_HEIGHT 165
#define WC3_HEADER_SIZE 16
#define PREAMBLE_SIZE 8
typedef struct {
demux_plugin_t demux_plugin;
xine_stream_t *stream;
fifo_buffer_t *video_fifo;
fifo_buffer_t *audio_fifo;
input_plugin_t *input;
int status;
xine_bmiheader bih;
xine_waveformatex wave;
palette_entry_t *palettes;
unsigned int number_of_shots;
unsigned int current_shot;
off_t *shot_offsets;
int seek_flag; /* this is set when a seek occurs */
off_t data_start;
off_t data_size;
int64_t video_pts;
} demux_mve_t;
typedef struct {
demux_class_t demux_class;
} demux_mve_class_t;
/* bizarre palette lookup table */
static const unsigned char wc3_pal_lookup[] = {
0x00, 0x03, 0x05, 0x07, 0x09, 0x0B, 0x0D, 0x0E, 0x10, 0x12, 0x13, 0x15, 0x16,
0x18, 0x19, 0x1A,
0x1C, 0x1D, 0x1F, 0x20, 0x21, 0x23, 0x24, 0x25, 0x27, 0x28, 0x29, 0x2A, 0x2C,
0x2D, 0x2E, 0x2F,
0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3F,
0x40, 0x41, 0x42,
0x43, 0x44, 0x45, 0x46, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50,
0x51, 0x52, 0x53,
0x54, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F, 0x60, 0x61,
0x62, 0x63, 0x64,
0x65, 0x66, 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71,
0x72, 0x73, 0x74,
0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7D, 0x7E, 0x7F, 0x80,
0x81, 0x82, 0x83,
0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8D, 0x8E, 0x8F,
0x90, 0x91, 0x92,
0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E,
0x9F, 0xA0, 0xA1,
0xA2, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xAA, 0xAB, 0xAC,
0xAD, 0xAE, 0xAF,
0xB0, 0xB1, 0xB2, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xB9, 0xBA,
0xBB, 0xBC, 0xBD,
0xBE, 0xBF, 0xBF, 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC5, 0xC6, 0xC7, 0xC8,
0xC9, 0xCA, 0xCB,
0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, 0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD5,
0xD6, 0xD7, 0xD8,
0xD9, 0xDA, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF, 0xDF, 0xE0, 0xE1, 0xE2, 0xE3,
0xE4, 0xE4, 0xE5,
0xE6, 0xE7, 0xE8, 0xE9, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xED, 0xEE, 0xEF, 0xF0,
0xF1, 0xF1, 0xF2,
0xF3, 0xF4, 0xF5, 0xF6, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFA, 0xFB, 0xFC, 0xFD,
0xFD, 0xFD, 0xFD
};
static int demux_mve_send_chunk(demux_plugin_t *this_gen) {
demux_mve_t *this = (demux_mve_t *) this_gen;
buf_element_t *buf = NULL;
int64_t audio_pts = 0;
unsigned char preamble[PREAMBLE_SIZE];
unsigned int chunk_tag;
unsigned int chunk_size;
off_t current_file_pos;
unsigned int palette_number;
/* compensate for the initial data in the file */
current_file_pos = this->input->get_current_pos(this->input) -
this->data_start;
if (this->input->read(this->input, preamble, PREAMBLE_SIZE) !=
PREAMBLE_SIZE)
this->status = DEMUX_FINISHED;
else {
chunk_tag = _X_BE_32(&preamble[0]);
/* round up to the nearest even size */
chunk_size = (_X_BE_32(&preamble[4]) + 1) & (~1);
if (chunk_tag == BRCH_TAG) {
/* empty chunk; do nothing */
} else if (chunk_tag == SHOT_TAG) {
if (this->seek_flag) {
/* reset pts */
this->video_pts = 0;
_x_demux_control_newpts(this->stream, 0, BUF_FLAG_SEEK);
this->seek_flag = 0;
} else {
/* record the offset of the SHOT chunk */
if (this->current_shot < this->number_of_shots) {
this->shot_offsets[this->current_shot] =
this->input->get_current_pos(this->input) - PREAMBLE_SIZE;
}
}
this->current_shot++;
/* this is the start of a new shot; send a new palette */
if (this->input->read(this->input, preamble, 4) != 4) {
this->status = DEMUX_FINISHED;
return this->status;
}
palette_number = _X_LE_32(&preamble[0]);
if (palette_number >= this->number_of_shots) {
xine_log(this->stream->xine, XINE_LOG_MSG,
_("demux_wc3movie: SHOT chunk referenced invalid palette (%d >= %d)\n"),
palette_number, this->number_of_shots);
this->status = DEMUX_FINISHED;
return this->status;
}
buf = this->video_fifo->buffer_pool_alloc (this->video_fifo);
buf->decoder_flags = BUF_FLAG_SPECIAL|BUF_FLAG_HEADER;
buf->decoder_info[1] = BUF_SPECIAL_PALETTE;
buf->decoder_info[2] = PALETTE_SIZE;
buf->decoder_info_ptr[2] = &this->palettes[PALETTE_SIZE * palette_number];
buf->size = 0;
buf->type = BUF_VIDEO_WC3;
this->video_fifo->put (this->video_fifo, buf);
} else if (chunk_tag == AUDI_TAG) {
if( this->audio_fifo ) {
audio_pts = this->video_pts - WC3_PTS_INC;
while (chunk_size) {
buf = this->audio_fifo->buffer_pool_alloc (this->audio_fifo);
buf->type = BUF_AUDIO_LPCM_LE;
if( this->data_size )
buf->extra_info->input_normpos = (int)( (double) current_file_pos * 65535 / this->data_size);
buf->extra_info->input_time = audio_pts / 90;
buf->pts = audio_pts;
if (chunk_size > buf->max_size)
buf->size = buf->max_size;
else
buf->size = chunk_size;
chunk_size -= buf->size;
if (this->input->read(this->input, buf->content, buf->size) !=
buf->size) {
buf->free_buffer(buf);
this->status = DEMUX_FINISHED;
break;
}
if (!chunk_size)
buf->decoder_flags |= BUF_FLAG_FRAME_END;
this->audio_fifo->put (this->audio_fifo, buf);
}
}else{
this->input->seek(this->input, chunk_size, SEEK_CUR);
}
} else if (chunk_tag == VGA_TAG) {
while (chunk_size) {
buf = this->video_fifo->buffer_pool_alloc (this->video_fifo);
buf->type = BUF_VIDEO_WC3;
if( this->data_size )
buf->extra_info->input_normpos = (int)( (double) current_file_pos * 65535 / this->data_size);
buf->extra_info->input_time = this->video_pts / 90;
buf->pts = this->video_pts;
if (chunk_size > buf->max_size)
buf->size = buf->max_size;
else
buf->size = chunk_size;
chunk_size -= buf->size;
if (this->input->read(this->input, buf->content, buf->size) !=
buf->size) {
buf->free_buffer(buf);
this->status = DEMUX_FINISHED;
break;
}
if (!chunk_size)
buf->decoder_flags |= BUF_FLAG_FRAME_END;
this->video_fifo->put (this->video_fifo, buf);
}
this->video_pts += WC3_PTS_INC;
} else if (chunk_tag == TEXT_TAG) {
/*text_pts = this->video_pts - WC3_PTS_INC;*/
/* unhandled thus far */
this->input->seek(this->input, chunk_size, SEEK_CUR);
} else {
/* report an unknown chunk and skip it */
lprintf("encountered unknown chunk: %c%c%c%c\n",
(chunk_tag >> 24) & 0xFF,
(chunk_tag >> 16) & 0xFF,
(chunk_tag >> 8) & 0xFF,
(chunk_tag >> 0) & 0xFF);
this->input->seek(this->input, chunk_size, SEEK_CUR);
}
}
return this->status;
}
static void demux_mve_send_headers(demux_plugin_t *this_gen) {
demux_mve_t *this = (demux_mve_t *) this_gen;
buf_element_t *buf;
this->video_fifo = this->stream->video_fifo;
this->audio_fifo = this->stream->audio_fifo;
this->status = DEMUX_OK;
/* load stream information */
_x_stream_info_set(this->stream, XINE_STREAM_INFO_HAS_VIDEO, 1);
/* this is not strictly correct-- some WC3 MVE files do not contain
* audio, but I'm too lazy to check if that is the case */
_x_stream_info_set(this->stream, XINE_STREAM_INFO_HAS_AUDIO, 1);
_x_stream_info_set(this->stream, XINE_STREAM_INFO_VIDEO_WIDTH,
this->bih.biWidth);
_x_stream_info_set(this->stream, XINE_STREAM_INFO_VIDEO_HEIGHT,
this->bih.biHeight);
_x_stream_info_set(this->stream, XINE_STREAM_INFO_AUDIO_CHANNELS,
this->wave.nChannels);
_x_stream_info_set(this->stream, XINE_STREAM_INFO_AUDIO_SAMPLERATE,
this->wave.nSamplesPerSec);
_x_stream_info_set(this->stream, XINE_STREAM_INFO_AUDIO_BITS,
this->wave.wBitsPerSample);
/* send start buffers */
_x_demux_control_start(this->stream);
/* send init info to decoders */
buf = this->video_fifo->buffer_pool_alloc (this->video_fifo);
buf->decoder_flags = BUF_FLAG_HEADER|BUF_FLAG_STDHEADER|BUF_FLAG_FRAMERATE|
BUF_FLAG_FRAME_END;
buf->decoder_info[0] = WC3_PTS_INC; /* initial video_step */
buf->content = (void *)&this->bih;
buf->size = sizeof(this->bih);
buf->type = BUF_VIDEO_WC3;
this->video_fifo->put (this->video_fifo, buf);
if (this->audio_fifo) {
this->wave.wFormatTag = 1;
this->wave.nChannels = 1;
this->wave.nSamplesPerSec = 22050;
this->wave.wBitsPerSample = 16;
this->wave.nBlockAlign = (this->wave.wBitsPerSample / 8) * this->wave.nChannels;
this->wave.nAvgBytesPerSec = this->wave.nBlockAlign * this->wave.nSamplesPerSec;
buf = this->audio_fifo->buffer_pool_alloc (this->audio_fifo);
buf->type = BUF_AUDIO_LPCM_LE;
buf->decoder_flags = BUF_FLAG_HEADER|BUF_FLAG_STDHEADER|BUF_FLAG_FRAME_END;
buf->decoder_info[0] = 0;
buf->decoder_info[1] = this->wave.nSamplesPerSec;
buf->decoder_info[2] = this->wave.wBitsPerSample;
buf->decoder_info[3] = this->wave.nChannels;
buf->content = (void *)&this->wave;
buf->size = sizeof(this->wave);
this->audio_fifo->put (this->audio_fifo, buf);
}
}
/* returns 1 if the MVE file was opened successfully, 0 otherwise */
static int open_mve_file(demux_mve_t *this) {
unsigned char preamble[PREAMBLE_SIZE];
unsigned int chunk_tag;
unsigned int chunk_size;
unsigned char disk_palette[PALETTE_CHUNK_SIZE];
int i, j;
unsigned char r, g, b;
int temp;
unsigned char header[WC3_HEADER_SIZE];
void *title;
if (_x_demux_read_header(this->input, header, WC3_HEADER_SIZE) != WC3_HEADER_SIZE)
return 0;
if ( !_x_is_fourcc(&header[0], "FORM") ||
!_x_is_fourcc(&header[8], "MOVE") ||
!_x_is_fourcc(&header[12], "_PC_") )
return 0;
/* file is qualified */
this->bih.biSize = sizeof(xine_bmiheader);
/* these are the frame dimensions unless others are found */
this->bih.biWidth = WC3_USUAL_WIDTH;
this->bih.biHeight = WC3_USUAL_HEIGHT;
/* load the number of palettes, the only interesting piece of information
* in the _PC_ chunk; take it for granted that it will always appear at
* position 0x1C */
this->input->seek(this->input, 0x1C, SEEK_SET);
if (this->input->read(this->input, preamble, 4) != 4)
return 0;
this->number_of_shots = _X_LE_32(&preamble[0]);
/* allocate space for the shot offset index and set offsets to 0 */
this->shot_offsets = calloc(this->number_of_shots, sizeof(off_t));
this->current_shot = 0;
/* skip the SOND chunk */
this->input->seek(this->input, 12, SEEK_CUR);
/* load the palette chunks */
this->palettes = calloc(this->number_of_shots, PALETTE_SIZE *
sizeof(palette_entry_t));
if (!this->shot_offsets || !this->palettes) {
free (this->shot_offsets);
return 0;
}
for (i = 0; i < this->number_of_shots; i++) {
/* make sure there was a valid palette chunk preamble */
if (this->input->read(this->input, preamble, PREAMBLE_SIZE) !=
PREAMBLE_SIZE) {
free (this->palettes);
free (this->shot_offsets);
return 0;
}
if ( !_x_is_fourcc(&preamble[0], "PALT") ||
(_X_BE_32(&preamble[4]) != PALETTE_CHUNK_SIZE)) {
xine_log(this->stream->xine, XINE_LOG_MSG,
_("demux_wc3movie: There was a problem while loading palette chunks\n"));
free (this->palettes);
free (this->shot_offsets);
return 0;
}
/* load the palette chunk */
if (this->input->read(this->input, disk_palette, PALETTE_CHUNK_SIZE) !=
PALETTE_CHUNK_SIZE) {
free (this->palettes);
free (this->shot_offsets);
return 0;
}
/* convert and store the palette */
for (j = 0; j < PALETTE_SIZE; j++) {
r = disk_palette[j * 3 + 0];
g = disk_palette[j * 3 + 1];
b = disk_palette[j * 3 + 2];
/* rotate each component left by 2 */
temp = r << 2; r = (temp & 0xff) | (temp >> 8);
r = wc3_pal_lookup[r];
temp = g << 2; g = (temp & 0xff) | (temp >> 8);
g = wc3_pal_lookup[g];
temp = b << 2; b = (temp & 0xff) | (temp >> 8);
b = wc3_pal_lookup[b];
this->palettes[i * 256 + j].r = r;
this->palettes[i * 256 + j].g = g;
this->palettes[i * 256 + j].b = b;
}
}
/* after the palette chunks comes any number of chunks such as INDX,
* BNAM, SIZE and perhaps others; traverse chunks until first BRCH
* chunk is found */
chunk_tag = 0;
title = NULL;
while (chunk_tag != BRCH_TAG) {
if (this->input->read(this->input, preamble, PREAMBLE_SIZE) !=
PREAMBLE_SIZE) {
free (title);
free (this->palettes);
free (this->shot_offsets);
return 0;
}
chunk_tag = _X_BE_32(&preamble[0]);
/* round up to the nearest even size */
chunk_size = (_X_BE_32(&preamble[4]) + 1) & (~1);
switch (chunk_tag) {
case BRCH_TAG:
/* time to start demuxing */
break;
case BNAM_TAG:
/* load the name into the stream attributes */
free (title);
title = malloc (chunk_size);
if (!title || this->input->read(this->input, title, chunk_size) != chunk_size) {
free (title);
free (this->palettes);
free (this->shot_offsets);
return 0;
}
break;
case SIZE_TAG:
/* override the default width and height */
/* reuse the preamble bytes */
if (this->input->read(this->input, preamble, PREAMBLE_SIZE) !=
PREAMBLE_SIZE) {
free (title);
free (this->palettes);
free (this->shot_offsets);
return 0;
}
this->bih.biWidth = _X_BE_32(&preamble[0]);
this->bih.biHeight = _X_BE_32(&preamble[4]);
break;
case INDX_TAG:
/* index is not useful for this demuxer */
this->input->seek(this->input, chunk_size, SEEK_CUR);
break;
default:
/* report an unknown chunk and skip it */
lprintf("encountered unknown chunk: %c%c%c%c\n",
(chunk_tag >> 24) & 0xFF,
(chunk_tag >> 16) & 0xFF,
(chunk_tag >> 8) & 0xFF,
(chunk_tag >> 0) & 0xFF);
this->input->seek(this->input, chunk_size, SEEK_CUR);
break;
}
}
/* note the data start offset */
this->data_start = this->input->get_current_pos(this->input);
this->data_size = this->input->get_length(this->input) - this->data_start;
this->video_pts = 0;
_x_meta_info_set(this->stream, XINE_META_INFO_TITLE, title);
return 1;
}
static int demux_mve_seek (demux_plugin_t *this_gen,
off_t start_pos, int start_time, int playing) {
/*
* MVE files are comprised of a series of SHOTs. A SHOT begins when the
* camera angle changes. The first frame of a SHOT is effectively a
* keyframe so it is safe to seek to the start of a SHOT. A/V sync is
* not a concern since each video or audio chunk represents exactly
* 1/15 sec.
*
* When a seek is requested, traverse the list of SHOT offsets and find
* the best match. If not enough SHOT boundaries have been crossed while
* demuxing the file, traverse the file until enough SHOTs are found.
*/
demux_mve_t *this = (demux_mve_t *) this_gen;
int i;
unsigned char preamble[PREAMBLE_SIZE];
unsigned int chunk_tag;
unsigned int chunk_size;
int new_shot = -1;
start_time /= 1000;
start_pos = (off_t) ( (double) start_pos / 65535 *
this->data_size );
this->status = DEMUX_OK;
_x_demux_flush_engine(this->stream);
this->seek_flag = 1;
/* if input is non-seekable, do not proceed with the rest of this
* seek function */
if (!INPUT_IS_SEEKABLE(this->input))
return this->status;
/* make sure the first shot has been recorded */
if (this->shot_offsets[0] == 0) {
while (1) {
if (this->input->read(this->input, preamble, PREAMBLE_SIZE) !=
PREAMBLE_SIZE) {
this->status = DEMUX_FINISHED;
return this->status;
}
chunk_tag = _X_BE_32(&preamble[0]);
/* round up to the nearest even size */
chunk_size = (_X_BE_32(&preamble[4]) + 1) & (~1);
if (chunk_tag == SHOT_TAG) {
this->shot_offsets[0] =
this->input->get_current_pos(this->input) - PREAMBLE_SIZE;
/* skip the four SHOT data bytes (palette index) */
this->input->seek(this->input, 4, SEEK_CUR);
break; /* get out of the infinite while loop */
} else {
this->input->seek(this->input, chunk_size, SEEK_CUR);
}
}
}
/* compensate for data at start of file */
start_pos += this->data_start;
for (i = 0; i < this->number_of_shots - 1; i++) {
/* if the next shot offset has not been recorded, traverse through the
* file until it is found */
if (this->shot_offsets[i + 1] == 0) {
off_t current_pos;
/* be sure to be just after the last known shot_offset */
current_pos = this->input->get_current_pos(this->input);
if (current_pos < this->shot_offsets[i]) {
this->input->seek(this->input,
this->shot_offsets[i] + PREAMBLE_SIZE + 4,
SEEK_SET);
}
while (1) {
if (this->input->read(this->input, preamble, PREAMBLE_SIZE) !=
PREAMBLE_SIZE) {
this->status = DEMUX_FINISHED;
return this->status;
}
chunk_tag = _X_BE_32(&preamble[0]);
/* round up to the nearest even size */
chunk_size = (_X_BE_32(&preamble[4]) + 1) & (~1);
if (chunk_tag == SHOT_TAG) {
this->shot_offsets[i + 1] =
this->input->get_current_pos(this->input) - PREAMBLE_SIZE;
/* skip the four SHOT data bytes (palette index) */
this->input->seek(this->input, 4, SEEK_CUR);
break; /* get out of the infinite while loop */
} else {
this->input->seek(this->input, chunk_size, SEEK_CUR);
}
}
}
/* check if the seek-to offset falls in between this shot offset and
* the next one */
if ((start_pos >= this->shot_offsets[i]) &&
(start_pos < this->shot_offsets[i + 1])) {
new_shot = i;
break;
}
}
/* if no new shot was found in the loop, the new shot must be the last
* shot */
if (new_shot == -1)
new_shot = this->number_of_shots - 1;
this->current_shot = new_shot;
/* reposition the stream at new shot */
this->input->seek(this->input, this->shot_offsets[new_shot], SEEK_SET);
return this->status;
}
static void demux_mve_dispose (demux_plugin_t *this_gen) {
demux_mve_t *this = (demux_mve_t *) this_gen;
free(this->palettes);
free(this->shot_offsets);
free(this);
}
static int demux_mve_get_status (demux_plugin_t *this_gen) {
demux_mve_t *this = (demux_mve_t *) this_gen;
return this->status;
}
static int demux_mve_get_stream_length (demux_plugin_t *this_gen) {
return 0;
}
static uint32_t demux_mve_get_capabilities(demux_plugin_t *this_gen) {
return DEMUX_CAP_NOCAP;
}
static int demux_mve_get_optional_data(demux_plugin_t *this_gen,
void *data, int data_type) {
return DEMUX_OPTIONAL_UNSUPPORTED;
}
static demux_plugin_t *open_plugin (demux_class_t *class_gen, xine_stream_t *stream,
input_plugin_t *input) {
demux_mve_t *this;
this = calloc(1, sizeof(demux_mve_t));
this->stream = stream;
this->input = input;
this->demux_plugin.send_headers = demux_mve_send_headers;
this->demux_plugin.send_chunk = demux_mve_send_chunk;
this->demux_plugin.seek = demux_mve_seek;
this->demux_plugin.dispose = demux_mve_dispose;
this->demux_plugin.get_status = demux_mve_get_status;
this->demux_plugin.get_stream_length = demux_mve_get_stream_length;
this->demux_plugin.get_capabilities = demux_mve_get_capabilities;
this->demux_plugin.get_optional_data = demux_mve_get_optional_data;
this->demux_plugin.demux_class = class_gen;
this->status = DEMUX_FINISHED;
switch (stream->content_detection_method) {
case METHOD_BY_EXTENSION: {
const char *extensions, *mrl;
mrl = input->get_mrl (input);
extensions = class_gen->get_extensions (class_gen);
if (!_x_demux_check_extension (mrl, extensions)) {
free (this);
return NULL;
}
}
/* falling through is intended */
case METHOD_BY_CONTENT:
case METHOD_EXPLICIT:
if (!open_mve_file(this)) {
free (this);
return NULL;
}
break;
default:
free (this);
return NULL;
}
return &this->demux_plugin;
}
static const char *get_description (demux_class_t *this_gen) {
return "Wing Commander III Movie (MVE) demux plugin";
}
static const char *get_identifier (demux_class_t *this_gen) {
return "WC3 Movie";
}
static const char *get_extensions (demux_class_t *this_gen) {
return "mve";
}
static const char *get_mimetypes (demux_class_t *this_gen) {
return NULL;
}
static void class_dispose (demux_class_t *this_gen) {
demux_mve_class_t *this = (demux_mve_class_t *) this_gen;
free (this);
}
void *demux_wc3movie_init_plugin (xine_t *xine, void *data) {
demux_mve_class_t *this;
this = calloc(1, sizeof(demux_mve_class_t));
this->demux_class.open_plugin = open_plugin;
this->demux_class.get_description = get_description;
this->demux_class.get_identifier = get_identifier;
this->demux_class.get_mimetypes = get_mimetypes;
this->demux_class.get_extensions = get_extensions;
this->demux_class.dispose = class_dispose;
return this;
}

Get latest updates about Open Source Projects, Conferences and News.

Sign up for the SourceForge newsletter:





No, thanks