diff options
Diffstat (limited to 'apps/plugins/mpegplayer/libmpeg2/decode.c')
-rw-r--r-- | apps/plugins/mpegplayer/libmpeg2/decode.c | 527 |
1 files changed, 527 insertions, 0 deletions
diff --git a/apps/plugins/mpegplayer/libmpeg2/decode.c b/apps/plugins/mpegplayer/libmpeg2/decode.c new file mode 100644 index 0000000000..9c8081efbe --- /dev/null +++ b/apps/plugins/mpegplayer/libmpeg2/decode.c | |||
@@ -0,0 +1,527 @@ | |||
1 | /* | ||
2 | * decode.c | ||
3 | * Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org> | ||
4 | * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca> | ||
5 | * | ||
6 | * This file is part of mpeg2dec, a free MPEG-2 video stream decoder. | ||
7 | * See http://libmpeg2.sourceforge.net/ for updates. | ||
8 | * | ||
9 | * mpeg2dec is free software; you can redistribute it and/or modify | ||
10 | * it under the terms of the GNU General Public License as published by | ||
11 | * the Free Software Foundation; either version 2 of the License, or | ||
12 | * (at your option) any later version. | ||
13 | * | ||
14 | * mpeg2dec is distributed in the hope that it will be useful, | ||
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
17 | * GNU General Public License for more details. | ||
18 | * | ||
19 | * You should have received a copy of the GNU General Public License | ||
20 | * along with this program; if not, write to the Free Software | ||
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
22 | * | ||
23 | * $Id$ | ||
24 | * libmpeg2 sync history: | ||
25 | * 2008-07-01 - CVS revision 1.114 | ||
26 | */ | ||
27 | |||
28 | #include "plugin.h" | ||
29 | |||
30 | #include "mpeg2dec_config.h" | ||
31 | |||
32 | #include "mpeg2.h" | ||
33 | #include "attributes.h" | ||
34 | #include "mpeg2_internal.h" | ||
35 | |||
36 | #define BUFFER_SIZE (1194 * 1024) | ||
37 | |||
38 | #if defined(CPU_COLDFIRE) || (defined(CPU_ARM) && ARM_ARCH >= 6) | ||
39 | /* twice as large as on other targets because coldfire uses | ||
40 | * a secondary, transposed buffer for optimisation */ | ||
41 | static int16_t static_dct_block[128] IBSS_ATTR ATTR_ALIGN(16); | ||
42 | #define DCT_BLOCKSIZE (128 * sizeof (int16_t)) | ||
43 | #else | ||
44 | static int16_t static_dct_block[64] IBSS_ATTR ATTR_ALIGN(16); | ||
45 | #define DCT_BLOCKSIZE (64 * sizeof (int16_t)) | ||
46 | #endif | ||
47 | |||
48 | const mpeg2_info_t * mpeg2_info (mpeg2dec_t * mpeg2dec) | ||
49 | { | ||
50 | return &mpeg2dec->info; | ||
51 | } | ||
52 | |||
53 | static inline int skip_chunk (mpeg2dec_t * mpeg2dec, int bytes) | ||
54 | { | ||
55 | uint8_t * current; | ||
56 | uint32_t shift; | ||
57 | uint8_t * limit; | ||
58 | uint8_t byte; | ||
59 | |||
60 | if (!bytes) | ||
61 | return 0; | ||
62 | |||
63 | current = mpeg2dec->buf_start; | ||
64 | shift = mpeg2dec->shift; | ||
65 | limit = current + bytes; | ||
66 | |||
67 | do | ||
68 | { | ||
69 | byte = *current++; | ||
70 | |||
71 | if (shift == 0x00000100) | ||
72 | { | ||
73 | int skipped; | ||
74 | |||
75 | mpeg2dec->shift = 0xffffff00; | ||
76 | skipped = current - mpeg2dec->buf_start; | ||
77 | mpeg2dec->buf_start = current; | ||
78 | |||
79 | return skipped; | ||
80 | } | ||
81 | |||
82 | shift = (shift | byte) << 8; | ||
83 | } | ||
84 | while (current < limit); | ||
85 | |||
86 | mpeg2dec->shift = shift; | ||
87 | mpeg2dec->buf_start = current; | ||
88 | |||
89 | return 0; | ||
90 | } | ||
91 | |||
92 | static inline int copy_chunk (mpeg2dec_t * mpeg2dec, int bytes) | ||
93 | { | ||
94 | uint8_t * current; | ||
95 | uint32_t shift; | ||
96 | uint8_t * chunk_ptr; | ||
97 | uint8_t * limit; | ||
98 | uint8_t byte; | ||
99 | |||
100 | if (!bytes) | ||
101 | return 0; | ||
102 | |||
103 | current = mpeg2dec->buf_start; | ||
104 | shift = mpeg2dec->shift; | ||
105 | chunk_ptr = mpeg2dec->chunk_ptr; | ||
106 | limit = current + bytes; | ||
107 | |||
108 | do | ||
109 | { | ||
110 | byte = *current++; | ||
111 | |||
112 | if (shift == 0x00000100) | ||
113 | { | ||
114 | int copied; | ||
115 | |||
116 | mpeg2dec->shift = 0xffffff00; | ||
117 | mpeg2dec->chunk_ptr = chunk_ptr + 1; | ||
118 | copied = current - mpeg2dec->buf_start; | ||
119 | mpeg2dec->buf_start = current; | ||
120 | return copied; | ||
121 | } | ||
122 | |||
123 | shift = (shift | byte) << 8; | ||
124 | *chunk_ptr++ = byte; | ||
125 | } | ||
126 | while (current < limit); | ||
127 | |||
128 | mpeg2dec->shift = shift; | ||
129 | mpeg2dec->buf_start = current; | ||
130 | return 0; | ||
131 | } | ||
132 | |||
133 | void mpeg2_buffer (mpeg2dec_t * mpeg2dec, uint8_t * start, uint8_t * end) | ||
134 | { | ||
135 | mpeg2dec->buf_start = start; | ||
136 | mpeg2dec->buf_end = end; | ||
137 | } | ||
138 | |||
139 | int mpeg2_getpos (mpeg2dec_t * mpeg2dec) | ||
140 | { | ||
141 | return mpeg2dec->buf_end - mpeg2dec->buf_start; | ||
142 | } | ||
143 | |||
144 | static inline mpeg2_state_t seek_chunk (mpeg2dec_t * mpeg2dec) | ||
145 | { | ||
146 | int size, skipped; | ||
147 | |||
148 | size = mpeg2dec->buf_end - mpeg2dec->buf_start; | ||
149 | skipped = skip_chunk (mpeg2dec, size); | ||
150 | |||
151 | if (!skipped) | ||
152 | { | ||
153 | mpeg2dec->bytes_since_tag += size; | ||
154 | return STATE_BUFFER; | ||
155 | } | ||
156 | |||
157 | mpeg2dec->bytes_since_tag += skipped; | ||
158 | mpeg2dec->code = mpeg2dec->buf_start[-1]; | ||
159 | |||
160 | return STATE_INTERNAL_NORETURN; | ||
161 | } | ||
162 | |||
163 | mpeg2_state_t mpeg2_seek_header (mpeg2dec_t * mpeg2dec) | ||
164 | { | ||
165 | while (!(mpeg2dec->code == 0xb3 || | ||
166 | ((mpeg2dec->code == 0xb7 || mpeg2dec->code == 0xb8 || | ||
167 | !mpeg2dec->code) && mpeg2dec->sequence.width != (unsigned)-1))) | ||
168 | { | ||
169 | if (seek_chunk (mpeg2dec) == STATE_BUFFER) | ||
170 | return STATE_BUFFER; | ||
171 | } | ||
172 | |||
173 | mpeg2dec->chunk_start = | ||
174 | mpeg2dec->chunk_ptr = mpeg2dec->chunk_buffer; | ||
175 | |||
176 | mpeg2dec->user_data_len = 0; | ||
177 | |||
178 | return ((mpeg2dec->code == 0xb7) ? | ||
179 | mpeg2_header_end(mpeg2dec) : mpeg2_parse_header(mpeg2dec)); | ||
180 | } | ||
181 | |||
182 | #define RECEIVED(code,state) (((state) << 8) + (code)) | ||
183 | |||
184 | mpeg2_state_t mpeg2_parse (mpeg2dec_t * mpeg2dec) | ||
185 | { | ||
186 | int size_buffer, size_chunk, copied; | ||
187 | |||
188 | if (mpeg2dec->action) | ||
189 | { | ||
190 | mpeg2_state_t state; | ||
191 | |||
192 | state = mpeg2dec->action (mpeg2dec); | ||
193 | |||
194 | if (state > STATE_INTERNAL_NORETURN) | ||
195 | return state; | ||
196 | } | ||
197 | |||
198 | while (1) | ||
199 | { | ||
200 | while ((unsigned) (mpeg2dec->code - mpeg2dec->first_decode_slice) < | ||
201 | mpeg2dec->nb_decode_slices) | ||
202 | { | ||
203 | size_buffer = mpeg2dec->buf_end - mpeg2dec->buf_start; | ||
204 | size_chunk = mpeg2dec->chunk_buffer + BUFFER_SIZE - | ||
205 | mpeg2dec->chunk_ptr; | ||
206 | |||
207 | if (size_buffer <= size_chunk) | ||
208 | { | ||
209 | copied = copy_chunk (mpeg2dec, size_buffer); | ||
210 | |||
211 | if (!copied) | ||
212 | { | ||
213 | mpeg2dec->bytes_since_tag += size_buffer; | ||
214 | mpeg2dec->chunk_ptr += size_buffer; | ||
215 | return STATE_BUFFER; | ||
216 | } | ||
217 | } | ||
218 | else | ||
219 | { | ||
220 | copied = copy_chunk (mpeg2dec, size_chunk); | ||
221 | |||
222 | if (!copied) | ||
223 | { | ||
224 | /* filled the chunk buffer without finding a start code */ | ||
225 | mpeg2dec->bytes_since_tag += size_chunk; | ||
226 | mpeg2dec->action = seek_chunk; | ||
227 | return STATE_INVALID; | ||
228 | } | ||
229 | } | ||
230 | |||
231 | mpeg2dec->bytes_since_tag += copied; | ||
232 | |||
233 | mpeg2_slice (&mpeg2dec->decoder, mpeg2dec->code, | ||
234 | mpeg2dec->chunk_start); | ||
235 | mpeg2dec->code = mpeg2dec->buf_start[-1]; | ||
236 | mpeg2dec->chunk_ptr = mpeg2dec->chunk_start; | ||
237 | } | ||
238 | |||
239 | if ((unsigned) (mpeg2dec->code - 1) >= 0xb0 - 1) | ||
240 | break; | ||
241 | |||
242 | if (seek_chunk (mpeg2dec) == STATE_BUFFER) | ||
243 | return STATE_BUFFER; | ||
244 | } | ||
245 | |||
246 | mpeg2dec->action = mpeg2_seek_header; | ||
247 | |||
248 | switch (mpeg2dec->code) | ||
249 | { | ||
250 | case 0x00: | ||
251 | return mpeg2dec->state; | ||
252 | case 0xb3: | ||
253 | case 0xb7: | ||
254 | case 0xb8: | ||
255 | return (mpeg2dec->state == STATE_SLICE) ? STATE_SLICE : STATE_INVALID; | ||
256 | default: | ||
257 | mpeg2dec->action = seek_chunk; | ||
258 | return STATE_INVALID; | ||
259 | } | ||
260 | } | ||
261 | |||
262 | mpeg2_state_t mpeg2_parse_header (mpeg2dec_t * mpeg2dec) | ||
263 | { | ||
264 | static int (* const process_header[9]) (mpeg2dec_t *) = | ||
265 | { | ||
266 | mpeg2_header_picture, | ||
267 | mpeg2_header_extension, | ||
268 | mpeg2_header_user_data, | ||
269 | mpeg2_header_sequence, | ||
270 | NULL, | ||
271 | NULL, | ||
272 | NULL, | ||
273 | NULL, | ||
274 | mpeg2_header_gop | ||
275 | }; | ||
276 | |||
277 | int size_buffer, size_chunk, copied; | ||
278 | |||
279 | mpeg2dec->action = mpeg2_parse_header; | ||
280 | mpeg2dec->info.user_data = NULL; | ||
281 | mpeg2dec->info.user_data_len = 0; | ||
282 | |||
283 | while (1) | ||
284 | { | ||
285 | size_buffer = mpeg2dec->buf_end - mpeg2dec->buf_start; | ||
286 | size_chunk = mpeg2dec->chunk_buffer + BUFFER_SIZE - | ||
287 | mpeg2dec->chunk_ptr; | ||
288 | |||
289 | if (size_buffer <= size_chunk) | ||
290 | { | ||
291 | copied = copy_chunk (mpeg2dec, size_buffer); | ||
292 | |||
293 | if (!copied) | ||
294 | { | ||
295 | mpeg2dec->bytes_since_tag += size_buffer; | ||
296 | mpeg2dec->chunk_ptr += size_buffer; | ||
297 | return STATE_BUFFER; | ||
298 | } | ||
299 | } | ||
300 | else | ||
301 | { | ||
302 | copied = copy_chunk (mpeg2dec, size_chunk); | ||
303 | |||
304 | if (!copied) | ||
305 | { | ||
306 | /* filled the chunk buffer without finding a start code */ | ||
307 | mpeg2dec->bytes_since_tag += size_chunk; | ||
308 | mpeg2dec->code = 0xb4; | ||
309 | mpeg2dec->action = mpeg2_seek_header; | ||
310 | return STATE_INVALID; | ||
311 | } | ||
312 | } | ||
313 | |||
314 | mpeg2dec->bytes_since_tag += copied; | ||
315 | |||
316 | if (process_header[mpeg2dec->code & 0x0b] (mpeg2dec)) | ||
317 | { | ||
318 | mpeg2dec->code = mpeg2dec->buf_start[-1]; | ||
319 | mpeg2dec->action = mpeg2_seek_header; | ||
320 | return STATE_INVALID; | ||
321 | } | ||
322 | |||
323 | mpeg2dec->code = mpeg2dec->buf_start[-1]; | ||
324 | |||
325 | switch (RECEIVED (mpeg2dec->code, mpeg2dec->state)) | ||
326 | { | ||
327 | /* state transition after a sequence header */ | ||
328 | case RECEIVED (0x00, STATE_SEQUENCE): | ||
329 | case RECEIVED (0xb8, STATE_SEQUENCE): | ||
330 | mpeg2_header_sequence_finalize (mpeg2dec); | ||
331 | break; | ||
332 | |||
333 | /* other legal state transitions */ | ||
334 | case RECEIVED (0x00, STATE_GOP): | ||
335 | mpeg2_header_gop_finalize (mpeg2dec); | ||
336 | break; | ||
337 | case RECEIVED (0x01, STATE_PICTURE): | ||
338 | case RECEIVED (0x01, STATE_PICTURE_2ND): | ||
339 | mpeg2_header_picture_finalize (mpeg2dec); | ||
340 | mpeg2dec->action = mpeg2_header_slice_start; | ||
341 | break; | ||
342 | |||
343 | /* legal headers within a given state */ | ||
344 | case RECEIVED (0xb2, STATE_SEQUENCE): | ||
345 | case RECEIVED (0xb2, STATE_GOP): | ||
346 | case RECEIVED (0xb2, STATE_PICTURE): | ||
347 | case RECEIVED (0xb2, STATE_PICTURE_2ND): | ||
348 | case RECEIVED (0xb5, STATE_SEQUENCE): | ||
349 | case RECEIVED (0xb5, STATE_PICTURE): | ||
350 | case RECEIVED (0xb5, STATE_PICTURE_2ND): | ||
351 | mpeg2dec->chunk_ptr = mpeg2dec->chunk_start; | ||
352 | continue; | ||
353 | |||
354 | default: | ||
355 | mpeg2dec->action = mpeg2_seek_header; | ||
356 | return STATE_INVALID; | ||
357 | } | ||
358 | |||
359 | mpeg2dec->chunk_start = mpeg2dec->chunk_ptr = mpeg2dec->chunk_buffer; | ||
360 | mpeg2dec->user_data_len = 0; | ||
361 | |||
362 | return mpeg2dec->state; | ||
363 | } | ||
364 | } | ||
365 | |||
366 | int mpeg2_convert (mpeg2dec_t * mpeg2dec, mpeg2_convert_t convert, void * arg) | ||
367 | { | ||
368 | mpeg2_convert_init_t convert_init; | ||
369 | int error; | ||
370 | |||
371 | error = convert (MPEG2_CONVERT_SET, NULL, &mpeg2dec->sequence, 0, | ||
372 | arg, &convert_init); | ||
373 | |||
374 | if (!error) | ||
375 | { | ||
376 | mpeg2dec->convert = convert; | ||
377 | mpeg2dec->convert_arg = arg; | ||
378 | mpeg2dec->convert_id_size = convert_init.id_size; | ||
379 | mpeg2dec->convert_stride = 0; | ||
380 | } | ||
381 | |||
382 | return error; | ||
383 | } | ||
384 | |||
385 | int mpeg2_stride (mpeg2dec_t * mpeg2dec, int stride) | ||
386 | { | ||
387 | if (!mpeg2dec->convert) | ||
388 | { | ||
389 | if (stride < (int) mpeg2dec->sequence.width) | ||
390 | stride = mpeg2dec->sequence.width; | ||
391 | |||
392 | mpeg2dec->decoder.stride_frame = stride; | ||
393 | } | ||
394 | else | ||
395 | { | ||
396 | mpeg2_convert_init_t convert_init; | ||
397 | |||
398 | stride = mpeg2dec->convert(MPEG2_CONVERT_STRIDE, NULL, | ||
399 | &mpeg2dec->sequence, stride, | ||
400 | mpeg2dec->convert_arg, | ||
401 | &convert_init); | ||
402 | |||
403 | mpeg2dec->convert_id_size = convert_init.id_size; | ||
404 | mpeg2dec->convert_stride = stride; | ||
405 | } | ||
406 | |||
407 | return stride; | ||
408 | } | ||
409 | |||
410 | void mpeg2_set_buf (mpeg2dec_t * mpeg2dec, uint8_t * buf[MPEG2_COMPONENTS], void * id) | ||
411 | { | ||
412 | mpeg2_fbuf_t * fbuf; | ||
413 | |||
414 | if (mpeg2dec->custom_fbuf) | ||
415 | { | ||
416 | if (mpeg2dec->state == STATE_SEQUENCE) | ||
417 | { | ||
418 | mpeg2dec->fbuf[2] = mpeg2dec->fbuf[1]; | ||
419 | mpeg2dec->fbuf[1] = mpeg2dec->fbuf[0]; | ||
420 | } | ||
421 | |||
422 | mpeg2_set_fbuf (mpeg2dec, (mpeg2dec->decoder.coding_type == | ||
423 | PIC_FLAG_CODING_TYPE_B)); | ||
424 | |||
425 | fbuf = mpeg2dec->fbuf[0]; | ||
426 | } | ||
427 | else | ||
428 | { | ||
429 | fbuf = &mpeg2dec->fbuf_alloc[mpeg2dec->alloc_index].fbuf; | ||
430 | mpeg2dec->alloc_index_user = ++mpeg2dec->alloc_index; | ||
431 | } | ||
432 | |||
433 | fbuf->buf[0] = buf[0]; | ||
434 | #if MPEG2_COLOR | ||
435 | fbuf->buf[1] = buf[1]; | ||
436 | fbuf->buf[2] = buf[2]; | ||
437 | #endif | ||
438 | |||
439 | fbuf->id = id; | ||
440 | } | ||
441 | |||
442 | void mpeg2_custom_fbuf (mpeg2dec_t * mpeg2dec, int custom_fbuf) | ||
443 | { | ||
444 | mpeg2dec->custom_fbuf = custom_fbuf; | ||
445 | } | ||
446 | |||
447 | void mpeg2_skip (mpeg2dec_t * mpeg2dec, int skip) | ||
448 | { | ||
449 | mpeg2dec->first_decode_slice = 1; | ||
450 | mpeg2dec->nb_decode_slices = skip ? 0 : (0xb0 - 1); | ||
451 | } | ||
452 | |||
453 | void mpeg2_slice_region (mpeg2dec_t * mpeg2dec, int start, int end) | ||
454 | { | ||
455 | start = (start < 1) ? 1 : (start > 0xb0) ? 0xb0 : start; | ||
456 | end = (end < start) ? start : (end > 0xb0) ? 0xb0 : end; | ||
457 | mpeg2dec->first_decode_slice = start; | ||
458 | mpeg2dec->nb_decode_slices = end - start; | ||
459 | } | ||
460 | |||
461 | void mpeg2_tag_picture (mpeg2dec_t * mpeg2dec, uint32_t tag, uint32_t tag2) | ||
462 | { | ||
463 | mpeg2dec->tag_previous = mpeg2dec->tag_current; | ||
464 | mpeg2dec->tag2_previous = mpeg2dec->tag2_current; | ||
465 | mpeg2dec->tag_current = tag; | ||
466 | mpeg2dec->tag2_current = tag2; | ||
467 | mpeg2dec->num_tags++; | ||
468 | mpeg2dec->bytes_since_tag = 0; | ||
469 | } | ||
470 | |||
471 | void mpeg2_reset (mpeg2dec_t * mpeg2dec, int full_reset) | ||
472 | { | ||
473 | mpeg2dec->buf_start = mpeg2dec->buf_end = NULL; | ||
474 | mpeg2dec->num_tags = 0; | ||
475 | mpeg2dec->shift = 0xffffff00; | ||
476 | mpeg2dec->code = 0xb4; | ||
477 | mpeg2dec->action = mpeg2_seek_header; | ||
478 | mpeg2dec->state = STATE_INVALID; | ||
479 | mpeg2dec->first = 1; | ||
480 | |||
481 | mpeg2_reset_info(&mpeg2dec->info); | ||
482 | mpeg2dec->info.gop = NULL; | ||
483 | mpeg2dec->info.user_data = NULL; | ||
484 | mpeg2dec->info.user_data_len = 0; | ||
485 | |||
486 | if (full_reset) | ||
487 | { | ||
488 | mpeg2dec->info.sequence = NULL; | ||
489 | mpeg2_header_state_init (mpeg2dec); | ||
490 | } | ||
491 | } | ||
492 | |||
493 | mpeg2dec_t * mpeg2_init (void) | ||
494 | { | ||
495 | mpeg2dec_t * mpeg2dec; | ||
496 | |||
497 | mpeg2_idct_init (); | ||
498 | |||
499 | mpeg2dec = (mpeg2dec_t *)mpeg2_bufalloc(sizeof (mpeg2dec_t), | ||
500 | MPEG2_ALLOC_MPEG2DEC); | ||
501 | if (mpeg2dec == NULL) | ||
502 | return NULL; | ||
503 | |||
504 | mpeg2dec->decoder.DCTblock = static_dct_block; | ||
505 | |||
506 | rb->memset (mpeg2dec->decoder.DCTblock, 0, DCT_BLOCKSIZE); | ||
507 | |||
508 | DEBUGF("DCTblock: %p\n", mpeg2dec->decoder.DCTblock); | ||
509 | |||
510 | mpeg2dec->chunk_buffer = (uint8_t *)mpeg2_bufalloc(BUFFER_SIZE + 4, | ||
511 | MPEG2_ALLOC_CHUNK); | ||
512 | |||
513 | mpeg2dec->sequence.width = (unsigned)-1; | ||
514 | mpeg2_reset (mpeg2dec, 1); | ||
515 | |||
516 | return mpeg2dec; | ||
517 | } | ||
518 | |||
519 | void mpeg2_close (mpeg2dec_t * mpeg2dec) | ||
520 | { | ||
521 | mpeg2_header_state_init (mpeg2dec); | ||
522 | #if 0 | ||
523 | /* These are dedicated buffers in rockbox */ | ||
524 | mpeg2_free (mpeg2dec->chunk_buffer); | ||
525 | mpeg2_free (mpeg2dec); | ||
526 | #endif | ||
527 | } | ||