83b76dbe9bea6f6358ffc77b2d64da3e062fd4b1
[libav.git] / libavcodec / h263dec.c
1 /*
2 * H263 decoder
3 * Copyright (c) 2001 Fabrice Bellard.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19 #include "avcodec.h"
20 #include "dsputil.h"
21 #include "mpegvideo.h"
22
23 //#define DEBUG
24 //#define PRINT_FRAME_TIME
25 #ifdef PRINT_FRAME_TIME
26 static inline long long rdtsc()
27 {
28 long long l;
29 asm volatile( "rdtsc\n\t"
30 : "=A" (l)
31 );
32 // printf("%d\n", int(l/1000));
33 return l;
34 }
35 #endif
36
37 static int h263_decode_init(AVCodecContext *avctx)
38 {
39 MpegEncContext *s = avctx->priv_data;
40
41 s->avctx = avctx;
42 s->out_format = FMT_H263;
43
44 s->width = avctx->width;
45 s->height = avctx->height;
46 s->workaround_bugs= avctx->workaround_bugs;
47
48 /* select sub codec */
49 switch(avctx->codec->id) {
50 case CODEC_ID_H263:
51 s->gob_number = 0;
52 s->first_slice_line = 0;
53 break;
54 case CODEC_ID_MPEG4:
55 s->time_increment_bits = 4; /* default value for broken headers */
56 s->h263_pred = 1;
57 s->has_b_frames = 1; //default, might be overriden in the vol header during header parsing
58 break;
59 case CODEC_ID_MSMPEG4V1:
60 s->h263_msmpeg4 = 1;
61 s->h263_pred = 1;
62 s->msmpeg4_version=1;
63 break;
64 case CODEC_ID_MSMPEG4V2:
65 s->h263_msmpeg4 = 1;
66 s->h263_pred = 1;
67 s->msmpeg4_version=2;
68 break;
69 case CODEC_ID_MSMPEG4V3:
70 s->h263_msmpeg4 = 1;
71 s->h263_pred = 1;
72 s->msmpeg4_version=3;
73 break;
74 case CODEC_ID_WMV1:
75 s->h263_msmpeg4 = 1;
76 s->h263_pred = 1;
77 s->msmpeg4_version=4;
78 break;
79 case CODEC_ID_WMV2:
80 s->h263_msmpeg4 = 1;
81 s->h263_pred = 1;
82 s->msmpeg4_version=5;
83 break;
84 case CODEC_ID_H263I:
85 s->h263_intel = 1;
86 break;
87 default:
88 return -1;
89 }
90 s->codec_id= avctx->codec->id;
91 avctx->mbskip_table= s->mbskip_table;
92
93 /* for h263, we allocate the images after having read the header */
94 if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
95 if (MPV_common_init(s) < 0)
96 return -1;
97
98 if (s->h263_msmpeg4)
99 ff_msmpeg4_decode_init(s);
100 else
101 h263_decode_init_vlc(s);
102
103 return 0;
104 }
105
106 static int h263_decode_end(AVCodecContext *avctx)
107 {
108 MpegEncContext *s = avctx->priv_data;
109
110 MPV_common_end(s);
111 return 0;
112 }
113
114 static int h263_decode_frame(AVCodecContext *avctx,
115 void *data, int *data_size,
116 UINT8 *buf, int buf_size)
117 {
118 MpegEncContext *s = avctx->priv_data;
119 int ret;
120 AVPicture *pict = data;
121 #ifdef PRINT_FRAME_TIME
122 uint64_t time= rdtsc();
123 #endif
124 #ifdef DEBUG
125 printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
126 printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
127 #endif
128
129 s->hurry_up= avctx->hurry_up;
130 s->error_resilience= avctx->error_resilience;
131 s->workaround_bugs= avctx->workaround_bugs;
132 s->flags= avctx->flags;
133
134 /* no supplementary picture */
135 if (buf_size == 0) {
136 *data_size = 0;
137 return 0;
138 }
139
140 if(s->bitstream_buffer_size && buf_size<20){ //divx 5.01+ frame reorder
141 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size);
142 }else
143 init_get_bits(&s->gb, buf, buf_size);
144 s->bitstream_buffer_size=0;
145
146 /* let's go :-) */
147 if (s->h263_msmpeg4) {
148 ret = msmpeg4_decode_picture_header(s);
149 } else if (s->h263_pred) {
150 ret = mpeg4_decode_picture_header(s);
151 s->has_b_frames= !s->low_delay;
152 } else if (s->h263_intel) {
153 ret = intel_h263_decode_picture_header(s);
154 } else {
155 ret = h263_decode_picture_header(s);
156 }
157
158 /* After H263 & mpeg4 header decode we have the height, width,*/
159 /* and other parameters. So then we could init the picture */
160 /* FIXME: By the way H263 decoder is evolving it should have */
161 /* an H263EncContext */
162 if (!s->context_initialized) {
163 avctx->width = s->width;
164 avctx->height = s->height;
165 avctx->aspect_ratio_info= s->aspect_ratio_info;
166 if (MPV_common_init(s) < 0)
167 return -1;
168 } else if (s->width != avctx->width || s->height != avctx->height) {
169 /* H.263 could change picture size any time */
170 MPV_common_end(s);
171 if (MPV_common_init(s) < 0)
172 return -1;
173 }
174
175 if(ret==FRAME_SKIPED) return 0;
176 /* skip if the header was thrashed */
177 if (ret < 0){
178 fprintf(stderr, "header damaged\n");
179 return -1;
180 }
181 /* skip b frames if we dont have reference frames */
182 if(s->num_available_buffers<2 && s->pict_type==B_TYPE) return 0;
183 /* skip b frames if we are in a hurry */
184 if(s->hurry_up && s->pict_type==B_TYPE) return 0;
185
186 if(s->next_p_frame_damaged){
187 if(s->pict_type==B_TYPE)
188 return 0;
189 else
190 s->next_p_frame_damaged=0;
191 }
192
193 MPV_frame_start(s);
194
195 #ifdef DEBUG
196 printf("qscale=%d\n", s->qscale);
197 #endif
198
199 /* init resync/ error resilience specific variables */
200 s->next_resync_qscale= s->qscale;
201 s->next_resync_gb= s->gb;
202 if(s->resync_marker) s->mb_num_left= 0;
203 else s->mb_num_left= s->mb_num;
204
205 /* decode each macroblock */
206 s->block_wrap[0]=
207 s->block_wrap[1]=
208 s->block_wrap[2]=
209 s->block_wrap[3]= s->mb_width*2 + 2;
210 s->block_wrap[4]=
211 s->block_wrap[5]= s->mb_width + 2;
212 for(s->mb_y=0; s->mb_y < s->mb_height; s->mb_y++) {
213 /* Check for GOB headers on H.263 */
214 /* FIXME: In the future H.263+ will have intra prediction */
215 /* and we are gonna need another way to detect MPEG4 */
216 if (s->mb_y && !s->h263_pred) {
217 s->first_slice_line = h263_decode_gob_header(s);
218 }
219
220 if(s->msmpeg4_version==1){
221 s->last_dc[0]=
222 s->last_dc[1]=
223 s->last_dc[2]= 128;
224 }
225
226 s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];
227 s->c_dc_scale= s->c_dc_scale_table[ s->qscale ];
228
229 s->block_index[0]= s->block_wrap[0]*(s->mb_y*2 + 1) - 1;
230 s->block_index[1]= s->block_wrap[0]*(s->mb_y*2 + 1);
231 s->block_index[2]= s->block_wrap[0]*(s->mb_y*2 + 2) - 1;
232 s->block_index[3]= s->block_wrap[0]*(s->mb_y*2 + 2);
233 s->block_index[4]= s->block_wrap[4]*(s->mb_y + 1) + s->block_wrap[0]*(s->mb_height*2 + 2);
234 s->block_index[5]= s->block_wrap[4]*(s->mb_y + 1 + s->mb_height + 2) + s->block_wrap[0]*(s->mb_height*2 + 2);
235 for(s->mb_x=0; s->mb_x < s->mb_width; s->mb_x++) {
236 s->block_index[0]+=2;
237 s->block_index[1]+=2;
238 s->block_index[2]+=2;
239 s->block_index[3]+=2;
240 s->block_index[4]++;
241 s->block_index[5]++;
242 #ifdef DEBUG
243 printf("**mb x=%d y=%d\n", s->mb_x, s->mb_y);
244 #endif
245
246 if(s->resync_marker){
247 if(s->mb_num_left<=0){
248 /* except the first block */
249 if(s->mb_x!=0 || s->mb_y!=0){
250 /* did we miss the next resync marker without noticing an error yet */
251 if(((get_bits_count(&s->gb)+8)&(~7)) != s->next_resync_pos && s->decoding_error==0){
252 fprintf(stderr, "slice end missmatch x:%d y:%d %d %d\n",
253 s->mb_x, s->mb_y, get_bits_count(&s->gb), s->next_resync_pos);
254 ff_conceal_past_errors(s, 1);
255 }
256 }
257 s->qscale= s->next_resync_qscale;
258 s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];
259 s->c_dc_scale= s->c_dc_scale_table[ s->qscale ];
260
261 s->gb= s->next_resync_gb;
262 s->resync_mb_x= s->mb_x; //we know that the marker is here cuz mb_num_left was the distance to it
263 s->resync_mb_y= s->mb_y;
264 s->first_slice_line=1;
265
266 if(s->codec_id==CODEC_ID_MPEG4){
267 ff_mpeg4_clean_buffers(s);
268 ff_mpeg4_resync(s);
269 }
270 }
271
272 if( s->resync_mb_x==s->mb_x
273 && s->resync_mb_y==s->mb_y && s->decoding_error!=0){
274 fprintf(stderr, "resynced at %d %d\n", s->mb_x, s->mb_y);
275 s->decoding_error= 0;
276 }
277 }
278
279 //fprintf(stderr,"\nFrame: %d\tMB: %d",avctx->frame_number, (s->mb_y * s->mb_width) + s->mb_x);
280 /* DCT & quantize */
281 if(s->decoding_error!=DECODING_DESYNC){
282 int last_error= s->decoding_error;
283 clear_blocks(s->block[0]);
284
285 s->mv_dir = MV_DIR_FORWARD;
286 s->mv_type = MV_TYPE_16X16;
287 if (s->h263_msmpeg4) {
288 if (msmpeg4_decode_mb(s, s->block) < 0) {
289 fprintf(stderr,"Error at MB: %d\n", (s->mb_y * s->mb_width) + s->mb_x);
290 s->decoding_error=DECODING_DESYNC;
291 }
292 } else {
293 if (h263_decode_mb(s, s->block) < 0) {
294 fprintf(stderr,"Error at MB: %d\n", (s->mb_y * s->mb_width) + s->mb_x);
295 s->decoding_error=DECODING_DESYNC;
296 }
297 }
298
299 if(s->decoding_error!=last_error){
300 ff_conceal_past_errors(s, 0);
301 }
302 }
303
304 /* conceal errors */
305 if( s->decoding_error==DECODING_DESYNC
306 || (s->decoding_error==DECODING_ACDC_LOST && s->mb_intra)){
307 s->mv_dir = MV_DIR_FORWARD;
308 s->mv_type = MV_TYPE_16X16;
309 s->mb_skiped=0;
310 s->mb_intra=0;
311 s->mv[0][0][0]=0; //FIXME this is not optimal
312 s->mv[0][0][1]=0;
313 clear_blocks(s->block[0]);
314 }else if(s->decoding_error && !s->mb_intra){
315 clear_blocks(s->block[0]);
316 }
317 //FIXME remove AC for intra
318
319 MPV_decode_mb(s, s->block);
320
321 s->mb_num_left--;
322 }
323 if ( avctx->draw_horiz_band
324 && (s->num_available_buffers>=1 || (!s->has_b_frames)) ) {
325 UINT8 *src_ptr[3];
326 int y, h, offset;
327 y = s->mb_y * 16;
328 h = s->height - y;
329 if (h > 16)
330 h = 16;
331 offset = y * s->linesize;
332 if(s->pict_type==B_TYPE || (!s->has_b_frames)){
333 src_ptr[0] = s->current_picture[0] + offset;
334 src_ptr[1] = s->current_picture[1] + (offset >> 2);
335 src_ptr[2] = s->current_picture[2] + (offset >> 2);
336 } else {
337 src_ptr[0] = s->last_picture[0] + offset;
338 src_ptr[1] = s->last_picture[1] + (offset >> 2);
339 src_ptr[2] = s->last_picture[2] + (offset >> 2);
340 }
341 avctx->draw_horiz_band(avctx, src_ptr, s->linesize,
342 y, s->width, h);
343 }
344 }
345
346 if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
347 if(msmpeg4_decode_ext_header(s, buf_size) < 0) return -1;
348
349 /* divx 5.01+ bistream reorder stuff */
350 if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0){
351 int current_pos= get_bits_count(&s->gb)>>3;
352
353 if( buf_size - current_pos > 5
354 && buf_size - current_pos < BITSTREAM_BUFFER_SIZE){
355 int i;
356 int startcode_found=0;
357 for(i=current_pos; i<buf_size; i++){
358 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
359 startcode_found=1;
360 break;
361 }
362 }
363 if(startcode_found){
364 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
365 s->bitstream_buffer_size= buf_size - current_pos;
366 }
367 }
368 }
369
370 if(s->bitstream_buffer_size==0 && s->error_resilience>0){
371 int left= s->gb.size*8 - get_bits_count(&s->gb);
372 int max_extra=8;
373
374 if(s->codec_id==CODEC_ID_MPEG4) max_extra+=32;
375
376 if(left>max_extra){
377 fprintf(stderr, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
378 if(s->decoding_error==0)
379 ff_conceal_past_errors(s, 1);
380 }
381 if(left<0){
382 fprintf(stderr, "overreading %d bits\n", -left);
383 if(s->decoding_error==0)
384 ff_conceal_past_errors(s, 1);
385 }
386 }
387
388 MPV_frame_end(s);
389 #if 0 //dirty show MVs, we should export the MV tables and write a filter to show them
390 {
391 int mb_y;
392 s->has_b_frames=1;
393 for(mb_y=0; mb_y<s->mb_height; mb_y++){
394 int mb_x;
395 int y= mb_y*16 + 8;
396 for(mb_x=0; mb_x<s->mb_width; mb_x++){
397 int x= mb_x*16 + 8;
398 uint8_t *ptr= s->last_picture[0];
399 int xy= 1 + mb_x*2 + (mb_y*2 + 1)*(s->mb_width*2 + 2);
400 int mx= (s->motion_val[xy][0]>>1) + x;
401 int my= (s->motion_val[xy][1]>>1) + y;
402 int i;
403 int max;
404
405 if(mx<0) mx=0;
406 if(my<0) my=0;
407 if(mx>=s->width) mx= s->width -1;
408 if(my>=s->height) my= s->height-1;
409 max= ABS(mx-x);
410 if(ABS(my-y) > max) max= ABS(my-y);
411 /* the ugliest linedrawing routine ... */
412 for(i=0; i<max; i++){
413 int x1= x + (mx-x)*i/max;
414 int y1= y + (my-y)*i/max;
415 ptr[y1*s->linesize + x1]+=100;
416 }
417 ptr[y*s->linesize + x]+=100;
418 s->mbskip_table[mb_x + mb_y*s->mb_width]=0;
419 }
420 }
421
422 }
423 #endif
424 if(s->pict_type==B_TYPE || (!s->has_b_frames)){
425 pict->data[0] = s->current_picture[0];
426 pict->data[1] = s->current_picture[1];
427 pict->data[2] = s->current_picture[2];
428 } else {
429 pict->data[0] = s->last_picture[0];
430 pict->data[1] = s->last_picture[1];
431 pict->data[2] = s->last_picture[2];
432 }
433 pict->linesize[0] = s->linesize;
434 pict->linesize[1] = s->linesize / 2;
435 pict->linesize[2] = s->linesize / 2;
436
437 avctx->quality = s->qscale;
438
439 /* Return the Picture timestamp as the frame number */
440 /* we substract 1 because it is added on utils.c */
441 avctx->frame_number = s->picture_number - 1;
442
443 /* dont output the last pic after seeking
444 note we allready added +1 for the current pix in MPV_frame_end(s) */
445 if(s->num_available_buffers>=2 || (!s->has_b_frames))
446 *data_size = sizeof(AVPicture);
447 #ifdef PRINT_FRAME_TIME
448 printf("%Ld\n", rdtsc()-time);
449 #endif
450 return buf_size;
451 }
452
453 AVCodec mpeg4_decoder = {
454 "mpeg4",
455 CODEC_TYPE_VIDEO,
456 CODEC_ID_MPEG4,
457 sizeof(MpegEncContext),
458 h263_decode_init,
459 NULL,
460 h263_decode_end,
461 h263_decode_frame,
462 CODEC_CAP_DRAW_HORIZ_BAND,
463 };
464
465 AVCodec h263_decoder = {
466 "h263",
467 CODEC_TYPE_VIDEO,
468 CODEC_ID_H263,
469 sizeof(MpegEncContext),
470 h263_decode_init,
471 NULL,
472 h263_decode_end,
473 h263_decode_frame,
474 CODEC_CAP_DRAW_HORIZ_BAND,
475 };
476
477 AVCodec msmpeg4v1_decoder = {
478 "msmpeg4v1",
479 CODEC_TYPE_VIDEO,
480 CODEC_ID_MSMPEG4V1,
481 sizeof(MpegEncContext),
482 h263_decode_init,
483 NULL,
484 h263_decode_end,
485 h263_decode_frame,
486 CODEC_CAP_DRAW_HORIZ_BAND,
487 };
488
489 AVCodec msmpeg4v2_decoder = {
490 "msmpeg4v2",
491 CODEC_TYPE_VIDEO,
492 CODEC_ID_MSMPEG4V2,
493 sizeof(MpegEncContext),
494 h263_decode_init,
495 NULL,
496 h263_decode_end,
497 h263_decode_frame,
498 CODEC_CAP_DRAW_HORIZ_BAND,
499 };
500
501 AVCodec msmpeg4v3_decoder = {
502 "msmpeg4",
503 CODEC_TYPE_VIDEO,
504 CODEC_ID_MSMPEG4V3,
505 sizeof(MpegEncContext),
506 h263_decode_init,
507 NULL,
508 h263_decode_end,
509 h263_decode_frame,
510 CODEC_CAP_DRAW_HORIZ_BAND,
511 };
512
513 AVCodec wmv1_decoder = {
514 "wmv1",
515 CODEC_TYPE_VIDEO,
516 CODEC_ID_WMV1,
517 sizeof(MpegEncContext),
518 h263_decode_init,
519 NULL,
520 h263_decode_end,
521 h263_decode_frame,
522 CODEC_CAP_DRAW_HORIZ_BAND,
523 };
524
525 AVCodec wmv2_decoder = {
526 "wmv2",
527 CODEC_TYPE_VIDEO,
528 CODEC_ID_WMV2,
529 sizeof(MpegEncContext),
530 h263_decode_init,
531 NULL,
532 h263_decode_end,
533 h263_decode_frame,
534 CODEC_CAP_DRAW_HORIZ_BAND,
535 };
536
537 AVCodec h263i_decoder = {
538 "h263i",
539 CODEC_TYPE_VIDEO,
540 CODEC_ID_H263I,
541 sizeof(MpegEncContext),
542 h263_decode_init,
543 NULL,
544 h263_decode_end,
545 h263_decode_frame,
546 CODEC_CAP_DRAW_HORIZ_BAND,
547 };
548