overdue format updates
[libav.git] / libavcodec / mpeg12.c
1 /*
2 * MPEG1 codec / MPEG2 decoder
3 * Copyright (c) 2000,2001 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
20 /**
21 * @file mpeg12.c
22 * MPEG1 codec / MPEG2 decoder.
23 */
24
25 //#define DEBUG
26 #include "avcodec.h"
27 #include "dsputil.h"
28 #include "mpegvideo.h"
29
30 #include "mpeg12data.h"
31
32
33 /* Start codes. */
34 #define SEQ_END_CODE 0x000001b7
35 #define SEQ_START_CODE 0x000001b3
36 #define GOP_START_CODE 0x000001b8
37 #define PICTURE_START_CODE 0x00000100
38 #define SLICE_MIN_START_CODE 0x00000101
39 #define SLICE_MAX_START_CODE 0x000001af
40 #define EXT_START_CODE 0x000001b5
41 #define USER_START_CODE 0x000001b2
42
43 #define DC_VLC_BITS 9
44 #define MV_VLC_BITS 9
45 #define MBINCR_VLC_BITS 9
46 #define MB_PAT_VLC_BITS 9
47 #define MB_PTYPE_VLC_BITS 6
48 #define MB_BTYPE_VLC_BITS 6
49 #define TEX_VLC_BITS 9
50
51 static void mpeg1_encode_block(MpegEncContext *s,
52 DCTELEM *block,
53 int component);
54 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code); // RAL: f_code parameter added
55 static void mpeg1_skip_picture(MpegEncContext *s, int pict_num);
56 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
57 DCTELEM *block,
58 int n);
59 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
60 DCTELEM *block,
61 int n);
62 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
63 DCTELEM *block,
64 int n);
65 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
66 DCTELEM *block,
67 int n);
68 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
69
70 #ifdef CONFIG_ENCODERS
71 static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
72 static uint8_t fcode_tab[MAX_MV*2+1];
73
74 static uint32_t uni_mpeg1_ac_vlc_bits[64*64*2];
75 static uint8_t uni_mpeg1_ac_vlc_len [64*64*2];
76 #endif
77
78 static void init_2d_vlc_rl(RLTable *rl)
79 {
80 int i;
81
82 init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2,
83 &rl->table_vlc[0][1], 4, 2,
84 &rl->table_vlc[0][0], 4, 2);
85
86
87 rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
88 for(i=0; i<rl->vlc.table_size; i++){
89 int code= rl->vlc.table[i][0];
90 int len = rl->vlc.table[i][1];
91 int level, run;
92
93 if(len==0){ // illegal code
94 run= 65;
95 level= MAX_LEVEL;
96 }else if(len<0){ //more bits needed
97 run= 0;
98 level= code;
99 }else{
100 if(code==rl->n){ //esc
101 run= 65;
102 level= 0;
103 }else if(code==rl->n+1){ //eob
104 run= 0;
105 level= 127;
106 }else{
107 run= rl->table_run [code] + 1;
108 level= rl->table_level[code];
109 }
110 }
111 rl->rl_vlc[0][i].len= len;
112 rl->rl_vlc[0][i].level= level;
113 rl->rl_vlc[0][i].run= run;
114 }
115 }
116
117 static void init_uni_ac_vlc(RLTable *rl, uint32_t *uni_ac_vlc_bits, uint8_t *uni_ac_vlc_len){
118 int i;
119
120 for(i=0; i<128; i++){
121 int level= i-64;
122 int run;
123 for(run=0; run<64; run++){
124 int len, bits, code;
125
126 int alevel= ABS(level);
127 int sign= (level>>31)&1;
128
129 if (alevel > rl->max_level[0][run])
130 code= 111; /*rl->n*/
131 else
132 code= rl->index_run[0][run] + alevel - 1;
133
134 if (code < 111 /* rl->n */) {
135 /* store the vlc & sign at once */
136 len= mpeg1_vlc[code][1]+1;
137 bits= (mpeg1_vlc[code][0]<<1) + sign;
138 } else {
139 len= mpeg1_vlc[111/*rl->n*/][1]+6;
140 bits= mpeg1_vlc[111/*rl->n*/][0]<<6;
141
142 bits|= run;
143 if (alevel < 128) {
144 bits<<=8; len+=8;
145 bits|= level & 0xff;
146 } else {
147 bits<<=16; len+=16;
148 bits|= level & 0xff;
149 if (level < 0) {
150 bits|= 0x8001 + level + 255;
151 } else {
152 bits|= level & 0xffff;
153 }
154 }
155 }
156
157 uni_ac_vlc_bits[UNI_AC_ENC_INDEX(run, i)]= bits;
158 uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
159 }
160 }
161 }
162
163 static void put_header(MpegEncContext *s, int header)
164 {
165 align_put_bits(&s->pb);
166 put_bits(&s->pb, 16, header>>16);
167 put_bits(&s->pb, 16, header&0xFFFF);
168 }
169
170 /* put sequence header if needed */
171 static void mpeg1_encode_sequence_header(MpegEncContext *s)
172 {
173 unsigned int vbv_buffer_size;
174 unsigned int fps, v;
175 int n, i;
176 uint64_t time_code;
177 float best_aspect_error= 1E10;
178 float aspect_ratio= s->avctx->aspect_ratio;
179
180 if(aspect_ratio==0.0) aspect_ratio= s->width / (float)s->height; //pixel aspect 1:1 (VGA)
181
182 if (s->current_picture.key_frame) {
183 /* mpeg1 header repeated every gop */
184 put_header(s, SEQ_START_CODE);
185
186 /* search closest frame rate */
187 {
188 int i, dmin, d;
189 s->frame_rate_index = 0;
190 dmin = 0x7fffffff;
191 for(i=1;i<14;i++) {
192 if(s->avctx->strict_std_compliance >= 0 && i>=9) break;
193
194 d = abs(MPEG1_FRAME_RATE_BASE*(int64_t)s->avctx->frame_rate/s->avctx->frame_rate_base - frame_rate_tab[i]);
195 if (d < dmin) {
196 dmin = d;
197 s->frame_rate_index = i;
198 }
199 }
200 }
201
202 put_bits(&s->pb, 12, s->width);
203 put_bits(&s->pb, 12, s->height);
204
205 for(i=1; i<15; i++){
206 float error= mpeg1_aspect[i] - s->width/(s->height*aspect_ratio);
207 error= ABS(error);
208
209 if(error < best_aspect_error){
210 best_aspect_error= error;
211 s->aspect_ratio_info= i;
212 }
213 }
214
215 put_bits(&s->pb, 4, s->aspect_ratio_info);
216 put_bits(&s->pb, 4, s->frame_rate_index);
217 v = (s->bit_rate + 399) / 400;
218 if (v > 0x3ffff)
219 v = 0x3ffff;
220 put_bits(&s->pb, 18, v);
221 put_bits(&s->pb, 1, 1); /* marker */
222
223 if(s->avctx->rc_buffer_size)
224 vbv_buffer_size = s->avctx->rc_buffer_size;
225 else
226 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
227 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
228 put_bits(&s->pb, 10, (vbv_buffer_size + 16383) / 16384);
229 put_bits(&s->pb, 1, 1); /* constrained parameter flag */
230 put_bits(&s->pb, 1, 0); /* no custom intra matrix */
231 put_bits(&s->pb, 1, 0); /* no custom non intra matrix */
232
233 put_header(s, GOP_START_CODE);
234 put_bits(&s->pb, 1, 0); /* do drop frame */
235 /* time code : we must convert from the real frame rate to a
236 fake mpeg frame rate in case of low frame rate */
237 fps = frame_rate_tab[s->frame_rate_index];
238 time_code = (int64_t)s->fake_picture_number * MPEG1_FRAME_RATE_BASE;
239 s->gop_picture_number = s->fake_picture_number;
240 put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
241 put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
242 put_bits(&s->pb, 1, 1);
243 put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
244 put_bits(&s->pb, 6, (uint32_t)((time_code % fps) / MPEG1_FRAME_RATE_BASE));
245 put_bits(&s->pb, 1, 1); /* closed gop */
246 put_bits(&s->pb, 1, 0); /* broken link */
247 }
248
249 if (s->avctx->frame_rate < (24 * s->avctx->frame_rate_base) && s->picture_number > 0) {
250 /* insert empty P pictures to slow down to the desired
251 frame rate. Each fake pictures takes about 20 bytes */
252 fps = frame_rate_tab[s->frame_rate_index];
253 n = av_rescale((int64_t)s->picture_number * s->avctx->frame_rate_base, fps, s->avctx->frame_rate) / MPEG1_FRAME_RATE_BASE - 1;
254 while (s->fake_picture_number < n) {
255 mpeg1_skip_picture(s, s->fake_picture_number -
256 s->gop_picture_number);
257 s->fake_picture_number++;
258 }
259
260 }
261 }
262
263 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
264 while (run >= 33) {
265 put_bits(&s->pb, 11, 0x008);
266 run -= 33;
267 }
268 put_bits(&s->pb, mbAddrIncrTable[run][1],
269 mbAddrIncrTable[run][0]);
270 }
271
272 /* insert a fake P picture */
273 static void mpeg1_skip_picture(MpegEncContext *s, int pict_num)
274 {
275 /* mpeg1 picture header */
276 put_header(s, PICTURE_START_CODE);
277 /* temporal reference */
278 put_bits(&s->pb, 10, pict_num & 0x3ff);
279
280 put_bits(&s->pb, 3, P_TYPE);
281 put_bits(&s->pb, 16, 0xffff); /* non constant bit rate */
282
283 put_bits(&s->pb, 1, 1); /* integer coordinates */
284 put_bits(&s->pb, 3, 1); /* forward_f_code */
285
286 put_bits(&s->pb, 1, 0); /* extra bit picture */
287
288 /* only one slice */
289 put_header(s, SLICE_MIN_START_CODE);
290 put_bits(&s->pb, 5, 1); /* quantizer scale */
291 put_bits(&s->pb, 1, 0); /* slice extra information */
292
293 encode_mb_skip_run(s, 0);
294
295 /* empty macroblock */
296 put_bits(&s->pb, 3, 1); /* motion only */
297
298 /* zero motion x & y */
299 put_bits(&s->pb, 1, 1);
300 put_bits(&s->pb, 1, 1);
301
302 /* output a number of empty slice */
303 encode_mb_skip_run(s, s->mb_width * s->mb_height - 2);
304
305 /* empty macroblock */
306 put_bits(&s->pb, 3, 1); /* motion only */
307
308 /* zero motion x & y */
309 put_bits(&s->pb, 1, 1);
310 put_bits(&s->pb, 1, 1);
311 }
312
313 static void common_init(MpegEncContext *s)
314 {
315 s->y_dc_scale_table=
316 s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
317 }
318
319 #ifdef CONFIG_ENCODERS
320
321 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
322 put_header(s, SLICE_MIN_START_CODE + s->mb_y);
323 put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
324 put_bits(&s->pb, 1, 0); /* slice extra information */
325 }
326
327 void ff_mpeg1_clean_buffers(MpegEncContext *s){
328 s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
329 s->last_dc[1] = s->last_dc[0];
330 s->last_dc[2] = s->last_dc[0];
331 memset(s->last_mv, 0, sizeof(s->last_mv));
332 }
333
334 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
335 {
336 mpeg1_encode_sequence_header(s);
337
338 /* mpeg1 picture header */
339 put_header(s, PICTURE_START_CODE);
340 /* temporal reference */
341
342 // RAL: s->picture_number instead of s->fake_picture_number
343 put_bits(&s->pb, 10, (s->picture_number -
344 s->gop_picture_number) & 0x3ff);
345 s->fake_picture_number++;
346
347 put_bits(&s->pb, 3, s->pict_type);
348 put_bits(&s->pb, 16, 0xffff); /* non constant bit rate */
349
350 // RAL: Forward f_code also needed for B frames
351 if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
352 put_bits(&s->pb, 1, 0); /* half pel coordinates */
353 put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
354 }
355
356 // RAL: Backward f_code necessary for B frames
357 if (s->pict_type == B_TYPE) {
358 put_bits(&s->pb, 1, 0); /* half pel coordinates */
359 put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
360 }
361
362 put_bits(&s->pb, 1, 0); /* extra bit picture */
363
364 s->mb_y=0;
365 ff_mpeg1_encode_slice_header(s);
366 }
367
368 void mpeg1_encode_mb(MpegEncContext *s,
369 DCTELEM block[6][64],
370 int motion_x, int motion_y)
371 {
372 int i, cbp;
373 const int mb_x = s->mb_x;
374 const int mb_y = s->mb_y;
375 const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
376
377 /* compute cbp */
378 cbp = 0;
379 for(i=0;i<6;i++) {
380 if (s->block_last_index[i] >= 0)
381 cbp |= 1 << (5 - i);
382 }
383
384 if (cbp == 0 && !first_mb && (mb_x != s->mb_width - 1 || mb_y != s->mb_height - 1) &&
385 ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
386 (s->pict_type == B_TYPE && s->mv_dir == s->last_mv_dir && (((s->mv_dir & MV_DIR_FORWARD) ? ((s->mv[0][0][0] - s->last_mv[0][0][0])|(s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
387 ((s->mv_dir & MV_DIR_BACKWARD) ? ((s->mv[1][0][0] - s->last_mv[1][0][0])|(s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
388 s->mb_skip_run++;
389 s->qscale -= s->dquant;
390 s->skip_count++;
391 s->misc_bits++;
392 s->last_bits++;
393 } else {
394 if(first_mb){
395 assert(s->mb_skip_run == 0);
396 encode_mb_skip_run(s, s->mb_x);
397 }else{
398 encode_mb_skip_run(s, s->mb_skip_run);
399 }
400
401 if (s->pict_type == I_TYPE) {
402 if(s->dquant && cbp){
403 put_bits(&s->pb, 2, 1); /* macroblock_type : macroblock_quant = 1 */
404 put_bits(&s->pb, 5, s->qscale);
405 }else{
406 put_bits(&s->pb, 1, 1); /* macroblock_type : macroblock_quant = 0 */
407 s->qscale -= s->dquant;
408 }
409 s->misc_bits+= get_bits_diff(s);
410 s->i_count++;
411 } else if (s->mb_intra) {
412 if(s->dquant && cbp){
413 put_bits(&s->pb, 6, 0x01);
414 put_bits(&s->pb, 5, s->qscale);
415 }else{
416 put_bits(&s->pb, 5, 0x03);
417 s->qscale -= s->dquant;
418 }
419 s->misc_bits+= get_bits_diff(s);
420 s->i_count++;
421 s->last_mv[0][0][0] =
422 s->last_mv[0][0][1] = 0;
423 } else if (s->pict_type == P_TYPE) {
424 if (cbp != 0) {
425 if (motion_x == 0 && motion_y == 0) {
426 if(s->dquant){
427 put_bits(&s->pb, 5, 1); /* macroblock_pattern & quant */
428 put_bits(&s->pb, 5, s->qscale);
429 }else{
430 put_bits(&s->pb, 2, 1); /* macroblock_pattern only */
431 }
432 s->misc_bits+= get_bits_diff(s);
433 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
434 } else {
435 if(s->dquant){
436 put_bits(&s->pb, 5, 2); /* motion + cbp */
437 put_bits(&s->pb, 5, s->qscale);
438 }else{
439 put_bits(&s->pb, 1, 1); /* motion + cbp */
440 }
441 s->misc_bits+= get_bits_diff(s);
442 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added
443 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added
444 s->mv_bits+= get_bits_diff(s);
445 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
446 }
447 } else {
448 put_bits(&s->pb, 3, 1); /* motion only */
449 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added
450 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added
451 s->qscale -= s->dquant;
452 s->mv_bits+= get_bits_diff(s);
453 }
454 s->f_count++;
455 } else
456 { // RAL: All the following bloc added for B frames:
457 if (cbp != 0)
458 { // With coded bloc pattern
459 if (s->mv_dir == (MV_DIR_FORWARD | MV_DIR_BACKWARD))
460 { // Bi-directional motion
461 if (s->dquant)
462 { // With QScale
463 put_bits(&s->pb, 5, 2);
464 put_bits(&s->pb, 5, s->qscale);
465 }
466 else // Without QScale
467 put_bits(&s->pb, 2, 3);
468 s->misc_bits += get_bits_diff(s);
469 mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
470 mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
471 mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
472 mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
473 s->b_count++;
474 s->f_count++;
475 s->mv_bits += get_bits_diff(s);
476 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
477 }
478 else if (s->mv_dir == MV_DIR_BACKWARD)
479 { // Backward motion
480 if (s->dquant)
481 { // With QScale
482 put_bits(&s->pb, 6, 2);
483 put_bits(&s->pb, 5, s->qscale);
484 }
485 else // Without QScale
486 put_bits(&s->pb, 3, 3);
487 s->misc_bits += get_bits_diff(s);
488 mpeg1_encode_motion(s, motion_x - s->last_mv[1][0][0], s->b_code);
489 mpeg1_encode_motion(s, motion_y - s->last_mv[1][0][1], s->b_code);
490 s->b_count++;
491 s->mv_bits += get_bits_diff(s);
492 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
493 }
494 else if (s->mv_dir == MV_DIR_FORWARD)
495 { // Forward motion
496 if (s->dquant)
497 { // With QScale
498 put_bits(&s->pb, 6, 3);
499 put_bits(&s->pb, 5, s->qscale);
500 }
501 else // Without QScale
502 put_bits(&s->pb, 4, 3);
503 s->misc_bits += get_bits_diff(s);
504 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);
505 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);
506 s->f_count++;
507 s->mv_bits += get_bits_diff(s);
508 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
509 }
510 }
511 else
512 { // No coded bloc pattern
513 if (s->mv_dir == (MV_DIR_FORWARD | MV_DIR_BACKWARD))
514 { // Bi-directional motion
515 put_bits(&s->pb, 2, 2); /* backward & forward motion */
516 mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
517 mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
518 mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
519 mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
520 s->b_count++;
521 s->f_count++;
522 }
523 else if (s->mv_dir == MV_DIR_BACKWARD)
524 { // Backward motion
525 put_bits(&s->pb, 3, 2); /* backward motion only */
526 mpeg1_encode_motion(s, motion_x - s->last_mv[1][0][0], s->b_code);
527 mpeg1_encode_motion(s, motion_y - s->last_mv[1][0][1], s->b_code);
528 s->b_count++;
529 }
530 else if (s->mv_dir == MV_DIR_FORWARD)
531 { // Forward motion
532 put_bits(&s->pb, 4, 2); /* forward motion only */
533 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);
534 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);
535 s->f_count++;
536 }
537 s->qscale -= s->dquant;
538 s->mv_bits += get_bits_diff(s);
539 }
540 // End of bloc from RAL
541 }
542 for(i=0;i<6;i++) {
543 if (cbp & (1 << (5 - i))) {
544 mpeg1_encode_block(s, block[i], i);
545 }
546 }
547 s->mb_skip_run = 0;
548 if(s->mb_intra)
549 s->i_tex_bits+= get_bits_diff(s);
550 else
551 s->p_tex_bits+= get_bits_diff(s);
552 }
553
554 // RAL: By this:
555 if (s->mv_dir & MV_DIR_FORWARD)
556 {
557 s->last_mv[0][0][0]= s->mv[0][0][0];
558 s->last_mv[0][0][1]= s->mv[0][0][1];
559 }
560 if (s->mv_dir & MV_DIR_BACKWARD)
561 {
562 s->last_mv[1][0][0]= s->mv[1][0][0];
563 s->last_mv[1][0][1]= s->mv[1][0][1];
564 }
565 }
566
567 // RAL: Parameter added: f_or_b_code
568 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
569 {
570 int code, bit_size, l, m, bits, range, sign;
571
572 if (val == 0) {
573 /* zero vector */
574 code = 0;
575 put_bits(&s->pb,
576 mbMotionVectorTable[0][1],
577 mbMotionVectorTable[0][0]);
578 } else {
579 bit_size = f_or_b_code - 1;
580 range = 1 << bit_size;
581 /* modulo encoding */
582 l = 16 * range;
583 m = 2 * l;
584 if (val < -l) {
585 val += m;
586 } else if (val >= l) {
587 val -= m;
588 }
589
590 if (val >= 0) {
591 val--;
592 code = (val >> bit_size) + 1;
593 bits = val & (range - 1);
594 sign = 0;
595 } else {
596 val = -val;
597 val--;
598 code = (val >> bit_size) + 1;
599 bits = val & (range - 1);
600 sign = 1;
601 }
602
603 assert(code > 0 && code <= 16);
604
605 put_bits(&s->pb,
606 mbMotionVectorTable[code][1],
607 mbMotionVectorTable[code][0]);
608
609 put_bits(&s->pb, 1, sign);
610 if (bit_size > 0) {
611 put_bits(&s->pb, bit_size, bits);
612 }
613 }
614 }
615
616 void ff_mpeg1_encode_init(MpegEncContext *s)
617 {
618 static int done=0;
619
620 common_init(s);
621
622 if(!done){
623 int f_code;
624 int mv;
625 int i;
626
627 done=1;
628 init_rl(&rl_mpeg1);
629
630 for(i=0; i<64; i++)
631 {
632 mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
633 mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
634 }
635
636 init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_bits, uni_mpeg1_ac_vlc_len);
637
638 /* build unified dc encoding tables */
639 for(i=-255; i<256; i++)
640 {
641 int adiff, index;
642 int bits, code;
643 int diff=i;
644
645 adiff = ABS(diff);
646 if(diff<0) diff--;
647 index = vlc_dc_table[adiff];
648
649 bits= vlc_dc_lum_bits[index] + index;
650 code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
651 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
652
653 bits= vlc_dc_chroma_bits[index] + index;
654 code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
655 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
656 }
657
658 mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
659
660 for(f_code=1; f_code<=MAX_FCODE; f_code++){
661 for(mv=-MAX_MV; mv<=MAX_MV; mv++){
662 int len;
663
664 if(mv==0) len= mbMotionVectorTable[0][1];
665 else{
666 int val, bit_size, range, code;
667
668 bit_size = s->f_code - 1;
669 range = 1 << bit_size;
670
671 val=mv;
672 if (val < 0)
673 val = -val;
674 val--;
675 code = (val >> bit_size) + 1;
676 if(code<17){
677 len= mbMotionVectorTable[code][1] + 1 + bit_size;
678 }else{
679 len= mbMotionVectorTable[16][1] + 2 + bit_size;
680 }
681 }
682
683 mv_penalty[f_code][mv+MAX_MV]= len;
684 }
685 }
686
687
688 for(f_code=MAX_FCODE; f_code>0; f_code--){
689 for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
690 fcode_tab[mv+MAX_MV]= f_code;
691 }
692 }
693 }
694 s->me.mv_penalty= mv_penalty;
695 s->fcode_tab= fcode_tab;
696 s->min_qcoeff=-255;
697 s->max_qcoeff= 255;
698 s->intra_ac_vlc_length=
699 s->inter_ac_vlc_length= uni_mpeg1_ac_vlc_len;
700 }
701
702 static inline void encode_dc(MpegEncContext *s, int diff, int component)
703 {
704 if (component == 0) {
705 put_bits(
706 &s->pb,
707 mpeg1_lum_dc_uni[diff+255]&0xFF,
708 mpeg1_lum_dc_uni[diff+255]>>8);
709 } else {
710 put_bits(
711 &s->pb,
712 mpeg1_chr_dc_uni[diff+255]&0xFF,
713 mpeg1_chr_dc_uni[diff+255]>>8);
714 }
715 }
716
717 static void mpeg1_encode_block(MpegEncContext *s,
718 DCTELEM *block,
719 int n)
720 {
721 int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
722 int code, component;
723 // RLTable *rl = &rl_mpeg1;
724
725 last_index = s->block_last_index[n];
726
727 /* DC coef */
728 if (s->mb_intra) {
729 component = (n <= 3 ? 0 : n - 4 + 1);
730 dc = block[0]; /* overflow is impossible */
731 diff = dc - s->last_dc[component];
732 encode_dc(s, diff, component);
733 s->last_dc[component] = dc;
734 i = 1;
735 } else {
736 /* encode the first coefficient : needs to be done here because
737 it is handled slightly differently */
738 level = block[0];
739 if (abs(level) == 1) {
740 code = ((uint32_t)level >> 31); /* the sign bit */
741 put_bits(&s->pb, 2, code | 0x02);
742 i = 1;
743 } else {
744 i = 0;
745 last_non_zero = -1;
746 goto next_coef;
747 }
748 }
749
750 /* now quantify & encode AC coefs */
751 last_non_zero = i - 1;
752
753 for(;i<=last_index;i++) {
754 j = s->intra_scantable.permutated[i];
755 level = block[j];
756 next_coef:
757 #if 0
758 if (level != 0)
759 dprintf("level[%d]=%d\n", i, level);
760 #endif
761 /* encode using VLC */
762 if (level != 0) {
763 run = i - last_non_zero - 1;
764
765 alevel= level;
766 MASK_ABS(sign, alevel)
767 sign&=1;
768
769 // code = get_rl_index(rl, 0, run, alevel);
770 if (alevel <= mpeg1_max_level[0][run]){
771 code= mpeg1_index_run[0][run] + alevel - 1;
772 /* store the vlc & sign at once */
773 put_bits(&s->pb, mpeg1_vlc[code][1]+1, (mpeg1_vlc[code][0]<<1) + sign);
774 } else {
775 /* escape seems to be pretty rare <5% so i dont optimize it */
776 put_bits(&s->pb, mpeg1_vlc[111/*rl->n*/][1], mpeg1_vlc[111/*rl->n*/][0]);
777 /* escape: only clip in this case */
778 put_bits(&s->pb, 6, run);
779 if (alevel < 128) {
780 put_bits(&s->pb, 8, level & 0xff);
781 } else {
782 if (level < 0) {
783 put_bits(&s->pb, 16, 0x8001 + level + 255);
784 } else {
785 put_bits(&s->pb, 16, level & 0xffff);
786 }
787 }
788 }
789 last_non_zero = i;
790 }
791 }
792 /* end of block */
793 put_bits(&s->pb, 2, 0x2);
794 }
795 #endif //CONFIG_ENCODERS
796
797 /******************************************/
798 /* decoding */
799
800 static VLC dc_lum_vlc;
801 static VLC dc_chroma_vlc;
802 static VLC mv_vlc;
803 static VLC mbincr_vlc;
804 static VLC mb_ptype_vlc;
805 static VLC mb_btype_vlc;
806 static VLC mb_pat_vlc;
807
808 static void init_vlcs(MpegEncContext *s)
809 {
810 static int done = 0;
811
812 if (!done) {
813 done = 1;
814
815 init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
816 vlc_dc_lum_bits, 1, 1,
817 vlc_dc_lum_code, 2, 2);
818 init_vlc(&dc_chroma_vlc, DC_VLC_BITS, 12,
819 vlc_dc_chroma_bits, 1, 1,
820 vlc_dc_chroma_code, 2, 2);
821 init_vlc(&mv_vlc, MV_VLC_BITS, 17,
822 &mbMotionVectorTable[0][1], 2, 1,
823 &mbMotionVectorTable[0][0], 2, 1);
824 init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
825 &mbAddrIncrTable[0][1], 2, 1,
826 &mbAddrIncrTable[0][0], 2, 1);
827 init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 63,
828 &mbPatTable[0][1], 2, 1,
829 &mbPatTable[0][0], 2, 1);
830
831 init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
832 &table_mb_ptype[0][1], 2, 1,
833 &table_mb_ptype[0][0], 2, 1);
834 init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
835 &table_mb_btype[0][1], 2, 1,
836 &table_mb_btype[0][0], 2, 1);
837 init_rl(&rl_mpeg1);
838 init_rl(&rl_mpeg2);
839
840 init_2d_vlc_rl(&rl_mpeg1);
841 init_2d_vlc_rl(&rl_mpeg2);
842 }
843 }
844
845 static inline int get_dmv(MpegEncContext *s)
846 {
847 if(get_bits1(&s->gb))
848 return 1 - (get_bits1(&s->gb) << 1);
849 else
850 return 0;
851 }
852
853 static inline int get_qscale(MpegEncContext *s)
854 {
855 int qscale = get_bits(&s->gb, 5);
856 if (s->mpeg2) {
857 if (s->q_scale_type) {
858 return non_linear_qscale[qscale];
859 } else {
860 return qscale << 1;
861 }
862 }
863 return qscale;
864 }
865
866 /* motion type (for mpeg2) */
867 #define MT_FIELD 1
868 #define MT_FRAME 2
869 #define MT_16X8 2
870 #define MT_DMV 3
871
872 static int mpeg_decode_mb(MpegEncContext *s,
873 DCTELEM block[6][64])
874 {
875 int i, j, k, cbp, val, mb_type, motion_type;
876
877 dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
878
879 assert(s->mb_skiped==0);
880
881 if (s->mb_skip_run-- != 0) {
882 if(s->pict_type == I_TYPE){
883 fprintf(stderr, "skiped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
884 return -1;
885 }
886
887 /* skip mb */
888 s->mb_intra = 0;
889 for(i=0;i<6;i++)
890 s->block_last_index[i] = -1;
891 s->mv_type = MV_TYPE_16X16;
892 if (s->pict_type == P_TYPE) {
893 /* if P type, zero motion vector is implied */
894 s->mv_dir = MV_DIR_FORWARD;
895 s->mv[0][0][0] = s->mv[0][0][1] = 0;
896 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
897 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
898 s->mb_skiped = 1;
899 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
900 } else {
901 /* if B type, reuse previous vectors and directions */
902 s->mv[0][0][0] = s->last_mv[0][0][0];
903 s->mv[0][0][1] = s->last_mv[0][0][1];
904 s->mv[1][0][0] = s->last_mv[1][0][0];
905 s->mv[1][0][1] = s->last_mv[1][0][1];
906
907 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
908 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1] | MB_TYPE_SKIP;
909 // assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
910
911 if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
912 s->mb_skiped = 1;
913 }
914
915 return 0;
916 }
917
918 switch(s->pict_type) {
919 default:
920 case I_TYPE:
921 if (get_bits1(&s->gb) == 0) {
922 if (get_bits1(&s->gb) == 0)
923 return -1;
924 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
925 } else {
926 mb_type = MB_TYPE_INTRA;
927 }
928 break;
929 case P_TYPE:
930 mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
931 if (mb_type < 0){
932 fprintf(stderr, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
933 return -1;
934 }
935 mb_type = ptype2mb_type[ mb_type ];
936 break;
937 case B_TYPE:
938 mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
939 if (mb_type < 0){
940 fprintf(stderr, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
941 return -1;
942 }
943 mb_type = btype2mb_type[ mb_type ];
944 break;
945 }
946 dprintf("mb_type=%x\n", mb_type);
947 // motion_type = 0; /* avoid warning */
948 if (IS_INTRA(mb_type)) {
949 /* compute dct type */
950 if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
951 !s->frame_pred_frame_dct) {
952 s->interlaced_dct = get_bits1(&s->gb);
953 }
954
955 if (IS_QUANT(mb_type))
956 s->qscale = get_qscale(s);
957
958 if (s->concealment_motion_vectors) {
959 /* just parse them */
960 if (s->picture_structure != PICT_FRAME)
961 skip_bits1(&s->gb); /* field select */
962 mpeg_decode_motion(s, s->mpeg_f_code[0][0], 0);
963 mpeg_decode_motion(s, s->mpeg_f_code[0][1], 0);
964 skip_bits1(&s->gb); /* marker */
965 }
966 s->mb_intra = 1;
967 memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
968
969 if (s->mpeg2) {
970 for(i=0;i<6;i++) {
971 if (mpeg2_decode_block_intra(s, block[i], i) < 0)
972 return -1;
973 }
974 } else {
975 for(i=0;i<6;i++) {
976 if (mpeg1_decode_block_intra(s, block[i], i) < 0)
977 return -1;
978 }
979 }
980 } else {
981 if (mb_type & MB_TYPE_ZERO_MV){
982 assert(mb_type & MB_TYPE_PAT);
983
984 /* compute dct type */
985 if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
986 !s->frame_pred_frame_dct) {
987 s->interlaced_dct = get_bits1(&s->gb);
988 }
989
990 if (IS_QUANT(mb_type))
991 s->qscale = get_qscale(s);
992
993 s->mv_dir = MV_DIR_FORWARD;
994 s->mv_type = MV_TYPE_16X16;
995 s->last_mv[0][0][0] = 0;
996 s->last_mv[0][0][1] = 0;
997 s->last_mv[0][1][0] = 0;
998 s->last_mv[0][1][1] = 0;
999 s->mv[0][0][0] = 0;
1000 s->mv[0][0][1] = 0;
1001 }else{
1002 assert(mb_type & MB_TYPE_L0L1);
1003 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1004 /* get additionnal motion vector type */
1005 if (s->frame_pred_frame_dct)
1006 motion_type = MT_FRAME;
1007 else{
1008 motion_type = get_bits(&s->gb, 2);
1009 }
1010
1011 /* compute dct type */
1012 if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1013 !s->frame_pred_frame_dct && IS_PAT(mb_type)) {
1014 s->interlaced_dct = get_bits1(&s->gb);
1015 }
1016
1017 if (IS_QUANT(mb_type))
1018 s->qscale = get_qscale(s);
1019
1020 /* motion vectors */
1021 s->mv_dir = 0;
1022 for(i=0;i<2;i++) {
1023 if (USES_LIST(mb_type, i)) {
1024 s->mv_dir |= (MV_DIR_FORWARD >> i);
1025 dprintf("motion_type=%d\n", motion_type);
1026 switch(motion_type) {
1027 case MT_FRAME: /* or MT_16X8 */
1028 if (s->picture_structure == PICT_FRAME) {
1029 /* MT_FRAME */
1030 mb_type |= MB_TYPE_16x16;
1031 s->mv_type = MV_TYPE_16X16;
1032 s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
1033 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1034 s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
1035 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1036 /* full_pel: only for mpeg1 */
1037 if (s->full_pel[i]){
1038 s->mv[i][0][0] <<= 1;
1039 s->mv[i][0][1] <<= 1;
1040 }
1041 } else {
1042 /* MT_16X8 */
1043 mb_type |= MB_TYPE_16x8;
1044 s->mv_type = MV_TYPE_16X8;
1045 for(j=0;j<2;j++) {
1046 s->field_select[i][j] = get_bits1(&s->gb);
1047 for(k=0;k<2;k++) {
1048 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1049 s->last_mv[i][j][k]);
1050 s->last_mv[i][j][k] = val;
1051 s->mv[i][j][k] = val;
1052 }
1053 }
1054 }
1055 break;
1056 case MT_FIELD:
1057 s->mv_type = MV_TYPE_FIELD;
1058 if (s->picture_structure == PICT_FRAME) {
1059 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1060 for(j=0;j<2;j++) {
1061 s->field_select[i][j] = get_bits1(&s->gb);
1062 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1063 s->last_mv[i][j][0]);
1064 s->last_mv[i][j][0] = val;
1065 s->mv[i][j][0] = val;
1066 dprintf("fmx=%d\n", val);
1067 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1068 s->last_mv[i][j][1] >> 1);
1069 s->last_mv[i][j][1] = val << 1;
1070 s->mv[i][j][1] = val;
1071 dprintf("fmy=%d\n", val);
1072 }
1073 } else {
1074 mb_type |= MB_TYPE_16x16;
1075 s->field_select[i][0] = get_bits1(&s->gb);
1076 for(k=0;k<2;k++) {
1077 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1078 s->last_mv[i][0][k]);
1079 s->last_mv[i][0][k] = val;
1080 s->last_mv[i][1][k] = val;
1081 s->mv[i][0][k] = val;
1082 }
1083 }
1084 break;
1085 case MT_DMV:
1086 {
1087 int dmx, dmy, mx, my, m;
1088
1089 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1090 s->last_mv[i][0][0]);
1091 s->last_mv[i][0][0] = mx;
1092 s->last_mv[i][1][0] = mx;
1093 dmx = get_dmv(s);
1094 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1095 s->last_mv[i][0][1] >> 1);
1096 dmy = get_dmv(s);
1097 s->mv_type = MV_TYPE_DMV;
1098 /* XXX: totally broken */
1099 if (s->picture_structure == PICT_FRAME) {
1100 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1101
1102 s->last_mv[i][0][1] = my << 1;
1103 s->last_mv[i][1][1] = my << 1;
1104
1105 m = s->top_field_first ? 1 : 3;
1106 /* top -> top pred */
1107 s->mv[i][0][0] = mx;
1108 s->mv[i][0][1] = my << 1;
1109 s->mv[i][1][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1110 s->mv[i][1][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1111 m = 4 - m;
1112 s->mv[i][2][0] = mx;
1113 s->mv[i][2][1] = my << 1;
1114 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1115 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1116 } else {
1117 mb_type |= MB_TYPE_16x16;
1118
1119 s->last_mv[i][0][1] = my;
1120 s->last_mv[i][1][1] = my;
1121 s->mv[i][0][0] = mx;
1122 s->mv[i][0][1] = my;
1123 s->mv[i][1][0] = ((mx + (mx > 0)) >> 1) + dmx;
1124 s->mv[i][1][1] = ((my + (my > 0)) >> 1) + dmy - 1
1125 /* + 2 * cur_field */;
1126 }
1127 }
1128 break;
1129 }
1130 }
1131 }
1132 }
1133
1134 s->mb_intra = 0;
1135
1136 if (IS_PAT(mb_type)) {
1137 cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1138 if (cbp < 0){
1139 fprintf(stderr, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1140 return -1;
1141 }
1142 cbp++;
1143
1144 if (s->mpeg2) {
1145 for(i=0;i<6;i++) {
1146 if (cbp & 32) {
1147 if (mpeg2_decode_block_non_intra(s, block[i], i) < 0)
1148 return -1;
1149 } else {
1150 s->block_last_index[i] = -1;
1151 }
1152 cbp+=cbp;
1153 }
1154 } else {
1155 for(i=0;i<6;i++) {
1156 if (cbp & 32) {
1157 if (mpeg1_decode_block_inter(s, block[i], i) < 0)
1158 return -1;
1159 } else {
1160 s->block_last_index[i] = -1;
1161 }
1162 cbp+=cbp;
1163 }
1164 }
1165 }else{
1166 for(i=0;i<6;i++)
1167 s->block_last_index[i] = -1;
1168 }
1169 }
1170
1171 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1172
1173 return 0;
1174 }
1175
1176 /* as h263, but only 17 codes */
1177 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1178 {
1179 int code, sign, val, l, shift;
1180
1181 code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1182 if (code == 0) {
1183 return pred;
1184 }
1185 if (code < 0) {
1186 return 0xffff;
1187 }
1188
1189 sign = get_bits1(&s->gb);
1190 shift = fcode - 1;
1191 val = code;
1192 if (shift) {
1193 val = (val - 1) << shift;
1194 val |= get_bits(&s->gb, shift);
1195 val++;
1196 }
1197 if (sign)
1198 val = -val;
1199 val += pred;
1200
1201 /* modulo decoding */
1202 l = 1 << (shift+4);
1203 val = ((val + l)&(l*2-1)) - l;
1204 return val;
1205 }
1206
1207 static inline int decode_dc(MpegEncContext *s, int component)
1208 {
1209 int code, diff;
1210
1211 if (component == 0) {
1212 code = get_vlc2(&s->gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1213 } else {
1214 code = get_vlc2(&s->gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1215 }
1216 if (code < 0){
1217 fprintf(stderr, "invalid dc code at %d %d\n", s->mb_x, s->mb_y);
1218 return 0xffff;
1219 }
1220 if (code == 0) {
1221 diff = 0;
1222 } else {
1223 diff = get_xbits(&s->gb, code);
1224 }
1225 return diff;
1226 }
1227
1228 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
1229 DCTELEM *block,
1230 int n)
1231 {
1232 int level, dc, diff, i, j, run;
1233 int component;
1234 RLTable *rl = &rl_mpeg1;
1235 uint8_t * const scantable= s->intra_scantable.permutated;
1236 const uint16_t *quant_matrix= s->intra_matrix;
1237 const int qscale= s->qscale;
1238
1239 /* DC coef */
1240 component = (n <= 3 ? 0 : n - 4 + 1);
1241 diff = decode_dc(s, component);
1242 if (diff >= 0xffff)
1243 return -1;
1244 dc = s->last_dc[component];
1245 dc += diff;
1246 s->last_dc[component] = dc;
1247 block[0] = dc<<3;
1248 dprintf("dc=%d diff=%d\n", dc, diff);
1249 i = 0;
1250 {
1251 OPEN_READER(re, &s->gb);
1252 /* now quantify & encode AC coefs */
1253 for(;;) {
1254 UPDATE_CACHE(re, &s->gb);
1255 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1256
1257 if(level == 127){
1258 break;
1259 } else if(level != 0) {
1260 i += run;
1261 j = scantable[i];
1262 level= (level*qscale*quant_matrix[j])>>3;
1263 level= (level-1)|1;
1264 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1265 LAST_SKIP_BITS(re, &s->gb, 1);
1266 } else {
1267 /* escape */
1268 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1269 UPDATE_CACHE(re, &s->gb);
1270 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1271 if (level == -128) {
1272 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1273 } else if (level == 0) {
1274 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
1275 }
1276 i += run;
1277 j = scantable[i];
1278 if(level<0){
1279 level= -level;
1280 level= (level*qscale*quant_matrix[j])>>3;
1281 level= (level-1)|1;
1282 level= -level;
1283 }else{
1284 level= (level*qscale*quant_matrix[j])>>3;
1285 level= (level-1)|1;
1286 }
1287 }
1288 if (i > 63){
1289 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1290 return -1;
1291 }
1292
1293 block[j] = level;
1294 }
1295 CLOSE_READER(re, &s->gb);
1296 }
1297 s->block_last_index[n] = i;
1298 return 0;
1299 }
1300
1301 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
1302 DCTELEM *block,
1303 int n)
1304 {
1305 int level, i, j, run;
1306 RLTable *rl = &rl_mpeg1;
1307 uint8_t * const scantable= s->intra_scantable.permutated;
1308 const uint16_t *quant_matrix= s->inter_matrix;
1309 const int qscale= s->qscale;
1310
1311 {
1312 int v;
1313 OPEN_READER(re, &s->gb);
1314 i = -1;
1315 /* special case for the first coef. no need to add a second vlc table */
1316 UPDATE_CACHE(re, &s->gb);
1317 v= SHOW_UBITS(re, &s->gb, 2);
1318 if (v & 2) {
1319 LAST_SKIP_BITS(re, &s->gb, 2);
1320 level= (3*qscale*quant_matrix[0])>>4;
1321 level= (level-1)|1;
1322 if(v&1)
1323 level= -level;
1324 block[0] = level;
1325 i++;
1326 }
1327
1328 /* now quantify & encode AC coefs */
1329 for(;;) {
1330 UPDATE_CACHE(re, &s->gb);
1331 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1332
1333 if(level == 127){
1334 break;
1335 } else if(level != 0) {
1336 i += run;
1337 j = scantable[i];
1338 level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1339 level= (level-1)|1;
1340 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1341 LAST_SKIP_BITS(re, &s->gb, 1);
1342 } else {
1343 /* escape */
1344 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1345 UPDATE_CACHE(re, &s->gb);
1346 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1347 if (level == -128) {
1348 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1349 } else if (level == 0) {
1350 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
1351 }
1352 i += run;
1353 j = scantable[i];
1354 if(level<0){
1355 level= -level;
1356 level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1357 level= (level-1)|1;
1358 level= -level;
1359 }else{
1360 level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1361 level= (level-1)|1;
1362 }
1363 }
1364 if (i > 63){
1365 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1366 return -1;
1367 }
1368
1369 block[j] = level;
1370 }
1371 CLOSE_READER(re, &s->gb);
1372 }
1373 s->block_last_index[n] = i;
1374 return 0;
1375 }
1376
1377 /* Also does unquantization here, since I will never support mpeg2
1378 encoding */
1379 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
1380 DCTELEM *block,
1381 int n)
1382 {
1383 int level, i, j, run;
1384 RLTable *rl = &rl_mpeg1;
1385 uint8_t * const scantable= s->intra_scantable.permutated;
1386 const uint16_t *quant_matrix;
1387 const int qscale= s->qscale;
1388 int mismatch;
1389
1390 mismatch = 1;
1391
1392 {
1393 int v;
1394 OPEN_READER(re, &s->gb);
1395 i = -1;
1396 if (n < 4)
1397 quant_matrix = s->inter_matrix;
1398 else
1399 quant_matrix = s->chroma_inter_matrix;
1400
1401 /* special case for the first coef. no need to add a second vlc table */
1402 UPDATE_CACHE(re, &s->gb);
1403 v= SHOW_UBITS(re, &s->gb, 2);
1404 if (v & 2) {
1405 LAST_SKIP_BITS(re, &s->gb, 2);
1406 level= (3*qscale*quant_matrix[0])>>5;
1407 if(v&1)
1408 level= -level;
1409 block[0] = level;
1410 mismatch ^= level;
1411 i++;
1412 }
1413
1414 /* now quantify & encode AC coefs */
1415 for(;;) {
1416 UPDATE_CACHE(re, &s->gb);
1417 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1418
1419 if(level == 127){
1420 break;
1421 } else if(level != 0) {
1422 i += run;
1423 j = scantable[i];
1424 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1425 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1426 LAST_SKIP_BITS(re, &s->gb, 1);
1427 } else {
1428 /* escape */
1429 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1430 UPDATE_CACHE(re, &s->gb);
1431 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1432
1433 i += run;
1434 j = scantable[i];
1435 if(level<0){
1436 level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1437 level= -level;
1438 }else{
1439 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1440 }
1441 }
1442 if (i > 63){
1443 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1444 return -1;
1445 }
1446
1447 mismatch ^= level;
1448 block[j] = level;
1449 }
1450 CLOSE_READER(re, &s->gb);
1451 }
1452 block[63] ^= (mismatch & 1);
1453
1454 s->block_last_index[n] = i;
1455 return 0;
1456 }
1457
1458 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1459 DCTELEM *block,
1460 int n)
1461 {
1462 int level, dc, diff, i, j, run;
1463 int component;
1464 RLTable *rl;
1465 uint8_t * const scantable= s->intra_scantable.permutated;
1466 const uint16_t *quant_matrix;
1467 const int qscale= s->qscale;
1468 int mismatch;
1469
1470 /* DC coef */
1471 if (n < 4){
1472 quant_matrix = s->intra_matrix;
1473 component = 0;
1474 }else{
1475 quant_matrix = s->chroma_intra_matrix;
1476 component = n - 3;
1477 }
1478 diff = decode_dc(s, component);
1479 if (diff >= 0xffff)
1480 return -1;
1481 dc = s->last_dc[component];
1482 dc += diff;
1483 s->last_dc[component] = dc;
1484 block[0] = dc << (3 - s->intra_dc_precision);
1485 dprintf("dc=%d\n", block[0]);
1486 mismatch = block[0] ^ 1;
1487 i = 0;
1488 if (s->intra_vlc_format)
1489 rl = &rl_mpeg2;
1490 else
1491 rl = &rl_mpeg1;
1492
1493 {
1494 OPEN_READER(re, &s->gb);
1495 /* now quantify & encode AC coefs */
1496 for(;;) {
1497 UPDATE_CACHE(re, &s->gb);
1498 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1499
1500 if(level == 127){
1501 break;
1502 } else if(level != 0) {
1503 i += run;
1504 j = scantable[i];
1505 level= (level*qscale*quant_matrix[j])>>4;
1506 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1507 LAST_SKIP_BITS(re, &s->gb, 1);
1508 } else {
1509 /* escape */
1510 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1511 UPDATE_CACHE(re, &s->gb);
1512 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1513 i += run;
1514 j = scantable[i];
1515 if(level<0){
1516 level= (-level*qscale*quant_matrix[j])>>4;
1517 level= -level;
1518 }else{
1519 level= (level*qscale*quant_matrix[j])>>4;
1520 }
1521 }
1522 if (i > 63){
1523 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1524 return -1;
1525 }
1526
1527 mismatch^= level;
1528 block[j] = level;
1529 }
1530 CLOSE_READER(re, &s->gb);
1531 }
1532 block[63]^= mismatch&1;
1533
1534 s->block_last_index[n] = i;
1535 return 0;
1536 }
1537
1538 typedef struct Mpeg1Context {
1539 MpegEncContext mpeg_enc_ctx;
1540 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1541 int repeat_field; /* true if we must repeat the field */
1542 } Mpeg1Context;
1543
1544 static int mpeg_decode_init(AVCodecContext *avctx)
1545 {
1546 Mpeg1Context *s = avctx->priv_data;
1547
1548 s->mpeg_enc_ctx.flags= avctx->flags;
1549 common_init(&s->mpeg_enc_ctx);
1550 init_vlcs(&s->mpeg_enc_ctx);
1551
1552 s->mpeg_enc_ctx_allocated = 0;
1553 s->mpeg_enc_ctx.picture_number = 0;
1554 s->repeat_field = 0;
1555 s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1556 return 0;
1557 }
1558
1559 /* return the 8 bit start code value and update the search
1560 state. Return -1 if no start code found */
1561 static int find_start_code(uint8_t **pbuf_ptr, uint8_t *buf_end)
1562 {
1563 uint8_t *buf_ptr;
1564 unsigned int state=0xFFFFFFFF, v;
1565 int val;
1566
1567 buf_ptr = *pbuf_ptr;
1568 while (buf_ptr < buf_end) {
1569 v = *buf_ptr++;
1570 if (state == 0x000001) {
1571 state = ((state << 8) | v) & 0xffffff;
1572 val = state;
1573 goto found;
1574 }
1575 state = ((state << 8) | v) & 0xffffff;
1576 }
1577 val = -1;
1578 found:
1579 *pbuf_ptr = buf_ptr;
1580 return val;
1581 }
1582
1583 static int mpeg1_decode_picture(AVCodecContext *avctx,
1584 uint8_t *buf, int buf_size)
1585 {
1586 Mpeg1Context *s1 = avctx->priv_data;
1587 MpegEncContext *s = &s1->mpeg_enc_ctx;
1588 int ref, f_code;
1589
1590 init_get_bits(&s->gb, buf, buf_size*8);
1591
1592 ref = get_bits(&s->gb, 10); /* temporal ref */
1593 s->pict_type = get_bits(&s->gb, 3);
1594 dprintf("pict_type=%d number=%d\n", s->pict_type, s->picture_number);
1595
1596 skip_bits(&s->gb, 16);
1597 if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1598 s->full_pel[0] = get_bits1(&s->gb);
1599 f_code = get_bits(&s->gb, 3);
1600 if (f_code == 0)
1601 return -1;
1602 s->mpeg_f_code[0][0] = f_code;
1603 s->mpeg_f_code[0][1] = f_code;
1604 }
1605 if (s->pict_type == B_TYPE) {
1606 s->full_pel[1] = get_bits1(&s->gb);
1607 f_code = get_bits(&s->gb, 3);
1608 if (f_code == 0)
1609 return -1;
1610 s->mpeg_f_code[1][0] = f_code;
1611 s->mpeg_f_code[1][1] = f_code;
1612 }
1613 s->current_picture.pict_type= s->pict_type;
1614 s->current_picture.key_frame= s->pict_type == I_TYPE;
1615
1616 s->y_dc_scale = 8;
1617 s->c_dc_scale = 8;
1618 s->first_slice = 1;
1619 return 0;
1620 }
1621
1622 static void mpeg_decode_sequence_extension(MpegEncContext *s)
1623 {
1624 int horiz_size_ext, vert_size_ext;
1625 int bit_rate_ext, vbv_buf_ext;
1626 int frame_rate_ext_n, frame_rate_ext_d;
1627 float aspect;
1628
1629 skip_bits(&s->gb, 8); /* profil and level */
1630 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1631 skip_bits(&s->gb, 2); /* chroma_format */
1632 horiz_size_ext = get_bits(&s->gb, 2);
1633 vert_size_ext = get_bits(&s->gb, 2);
1634 s->width |= (horiz_size_ext << 12);
1635 s->height |= (vert_size_ext << 12);
1636 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1637 s->bit_rate = ((s->bit_rate / 400) | (bit_rate_ext << 12)) * 400;
1638 skip_bits1(&s->gb); /* marker */
1639 vbv_buf_ext = get_bits(&s->gb, 8);
1640 s->low_delay = get_bits1(&s->gb);
1641 frame_rate_ext_n = get_bits(&s->gb, 2);
1642 frame_rate_ext_d = get_bits(&s->gb, 5);
1643 av_reduce(
1644 &s->avctx->frame_rate,
1645 &s->avctx->frame_rate_base,
1646 frame_rate_tab[s->frame_rate_index] * (frame_rate_ext_n+1),
1647 MPEG1_FRAME_RATE_BASE * (frame_rate_ext_d+1),
1648 1<<30);
1649
1650 dprintf("sequence extension\n");
1651 s->mpeg2 = 1;
1652 s->avctx->sub_id = 2; /* indicates mpeg2 found */
1653
1654 aspect= mpeg2_aspect[s->aspect_ratio_info];
1655 if(aspect>0.0) s->avctx->aspect_ratio= s->width/(aspect*s->height);
1656 else if(aspect<0.0) s->avctx->aspect_ratio= -1.0/aspect;
1657 }
1658
1659 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1660 {
1661 int i, v, j;
1662
1663 dprintf("matrix extension\n");
1664
1665 if (get_bits1(&s->gb)) {
1666 for(i=0;i<64;i++) {
1667 v = get_bits(&s->gb, 8);
1668 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1669 s->intra_matrix[j] = v;
1670 s->chroma_intra_matrix[j] = v;
1671 }
1672 }
1673 if (get_bits1(&s->gb)) {
1674 for(i=0;i<64;i++) {
1675 v = get_bits(&s->gb, 8);
1676 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1677 s->inter_matrix[j] = v;
1678 s->chroma_inter_matrix[j] = v;
1679 }
1680 }
1681 if (get_bits1(&s->gb)) {
1682 for(i=0;i<64;i++) {
1683 v = get_bits(&s->gb, 8);
1684 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1685 s->chroma_intra_matrix[j] = v;
1686 }
1687 }
1688 if (get_bits1(&s->gb)) {
1689 for(i=0;i<64;i++) {
1690 v = get_bits(&s->gb, 8);
1691 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1692 s->chroma_inter_matrix[j] = v;
1693 }
1694 }
1695 }
1696
1697 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1698 {
1699 s->full_pel[0] = s->full_pel[1] = 0;
1700 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1701 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1702 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1703 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1704 s->intra_dc_precision = get_bits(&s->gb, 2);
1705 s->picture_structure = get_bits(&s->gb, 2);
1706 s->top_field_first = get_bits1(&s->gb);
1707 s->frame_pred_frame_dct = get_bits1(&s->gb);
1708 s->concealment_motion_vectors = get_bits1(&s->gb);
1709 s->q_scale_type = get_bits1(&s->gb);
1710 s->intra_vlc_format = get_bits1(&s->gb);
1711 s->alternate_scan = get_bits1(&s->gb);
1712 s->repeat_first_field = get_bits1(&s->gb);
1713 s->chroma_420_type = get_bits1(&s->gb);
1714 s->progressive_frame = get_bits1(&s->gb);
1715
1716 if(s->picture_structure == PICT_FRAME)
1717 s->first_field=0;
1718 else{
1719 s->first_field ^= 1;
1720 memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1721 }
1722
1723 if(s->alternate_scan){
1724 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
1725 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
1726 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
1727 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
1728 }else{
1729 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
1730 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
1731 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
1732 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
1733 }
1734
1735 /* composite display not parsed */
1736 dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
1737 dprintf("picture_structure=%d\n", s->picture_structure);
1738 dprintf("top field first=%d\n", s->top_field_first);
1739 dprintf("repeat first field=%d\n", s->repeat_first_field);
1740 dprintf("conceal=%d\n", s->concealment_motion_vectors);
1741 dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
1742 dprintf("alternate_scan=%d\n", s->alternate_scan);
1743 dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1744 dprintf("progressive_frame=%d\n", s->progressive_frame);
1745 }
1746
1747 static void mpeg_decode_extension(AVCodecContext *avctx,
1748 uint8_t *buf, int buf_size)
1749 {
1750 Mpeg1Context *s1 = avctx->priv_data;
1751 MpegEncContext *s = &s1->mpeg_enc_ctx;
1752 int ext_type;
1753
1754 init_get_bits(&s->gb, buf, buf_size*8);
1755
1756 ext_type = get_bits(&s->gb, 4);
1757 switch(ext_type) {
1758 case 0x1:
1759 /* sequence ext */
1760 mpeg_decode_sequence_extension(s);
1761 break;
1762 case 0x3:
1763 /* quant matrix extension */
1764 mpeg_decode_quant_matrix_extension(s);
1765 break;
1766 case 0x8:
1767 /* picture extension */
1768 mpeg_decode_picture_coding_extension(s);
1769 break;
1770 }
1771 }
1772
1773 #define DECODE_SLICE_FATAL_ERROR -2
1774 #define DECODE_SLICE_ERROR -1
1775 #define DECODE_SLICE_OK 0
1776
1777 /**
1778 * decodes a slice.
1779 * @return DECODE_SLICE_FATAL_ERROR if a non recoverable error occured<br>
1780 * DECODE_SLICE_ERROR if the slice is damaged<br>
1781 * DECODE_SLICE_OK if this slice is ok<br>
1782 */
1783 static int mpeg_decode_slice(AVCodecContext *avctx,
1784 AVFrame *pict,
1785 int start_code,
1786 uint8_t **buf, int buf_size)
1787 {
1788 Mpeg1Context *s1 = avctx->priv_data;
1789 MpegEncContext *s = &s1->mpeg_enc_ctx;
1790 int ret;
1791 const int field_pic= s->picture_structure != PICT_FRAME;
1792
1793 s->resync_mb_x= s->mb_x =
1794 s->resync_mb_y= s->mb_y = -1;
1795
1796 start_code = (start_code - 1) & 0xff;
1797 if (start_code >= s->mb_height){
1798 fprintf(stderr, "slice below image (%d >= %d)\n", start_code, s->mb_height);
1799 return -1;
1800 }
1801
1802 ff_mpeg1_clean_buffers(s);
1803 s->interlaced_dct = 0;
1804
1805 /* start frame decoding */
1806 if (s->first_slice) {
1807 if(s->first_field || s->picture_structure==PICT_FRAME){
1808 if(MPV_frame_start(s, avctx) < 0)
1809 return DECODE_SLICE_FATAL_ERROR;
1810
1811 ff_er_frame_start(s);
1812
1813 /* first check if we must repeat the frame */
1814 s->current_picture.repeat_pict = 0;
1815
1816 if (s->repeat_first_field) {
1817 if (s->progressive_sequence) {
1818 if (s->top_field_first)
1819 s->current_picture.repeat_pict = 4;
1820 else
1821 s->current_picture.repeat_pict = 2;
1822 } else if (s->progressive_frame) {
1823 s->current_picture.repeat_pict = 1;
1824 }
1825 }
1826 // printf("%d \n", s->current_picture.repeat_pict);
1827
1828 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1829 printf("qp:%d fc:%2d%2d%2d%2d %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n",
1830 s->qscale, s->mpeg_f_code[0][0],s->mpeg_f_code[0][1],s->mpeg_f_code[1][0],s->mpeg_f_code[1][1],
1831 s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
1832 s->progressive_sequence ? "pro" :"", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1833 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1834 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1835 }
1836 }else{ //second field
1837 int i;
1838
1839 if(!s->current_picture_ptr){
1840 fprintf(stderr, "first field missing\n");
1841 return -1;
1842 }
1843
1844 for(i=0; i<4; i++){
1845 s->current_picture.data[i] = s->current_picture_ptr->data[i];
1846 if(s->picture_structure == PICT_BOTTOM_FIELD){
1847 s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1848 }
1849 }
1850 }
1851 }
1852 s->first_slice = 0;
1853
1854 init_get_bits(&s->gb, *buf, buf_size*8);
1855
1856 s->qscale = get_qscale(s);
1857 if(s->qscale == 0){
1858 fprintf(stderr, "qscale == 0\n");
1859 return -1;
1860 }
1861
1862 /* extra slice info */
1863 while (get_bits1(&s->gb) != 0) {
1864 skip_bits(&s->gb, 8);
1865 }
1866
1867 s->mb_x=0;
1868
1869 for(;;) {
1870 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1871 if (code < 0){
1872 fprintf(stderr, "first mb_incr damaged\n");
1873 return -1;
1874 }
1875 if (code >= 33) {
1876 if (code == 33) {
1877 s->mb_x += 33;
1878 }
1879 /* otherwise, stuffing, nothing to do */
1880 } else {
1881 s->mb_x += code;
1882 break;
1883 }
1884 }
1885
1886 s->resync_mb_x= s->mb_x;
1887 s->resync_mb_y= s->mb_y = start_code;
1888 s->mb_skip_run= 0;
1889
1890 for(;;) {
1891 s->dsp.clear_blocks(s->block[0]);
1892
1893 ret = mpeg_decode_mb(s, s->block);
1894
1895 dprintf("ret=%d\n", ret);
1896 if (ret < 0)
1897 return -1;
1898
1899 if(s->motion_val && s->pict_type != B_TYPE){ //note motion_val is normally NULL unless we want to extract the MVs
1900 const int wrap = s->block_wrap[0];
1901 const int xy = s->mb_x*2 + 1 + (s->mb_y*2 +1)*wrap;
1902 int motion_x, motion_y;
1903
1904 if (s->mb_intra) {
1905 motion_x = motion_y = 0;
1906 }else if (s->mv_type == MV_TYPE_16X16) {
1907 motion_x = s->mv[0][0][0];
1908 motion_y = s->mv[0][0][1];
1909 } else /*if (s->mv_type == MV_TYPE_FIELD)*/ {
1910 motion_x = s->mv[0][0][0] + s->mv[0][1][0];
1911 motion_y = s->mv[0][0][1] + s->mv[0][1][1];
1912 motion_x = (motion_x>>1) | (motion_x&1);
1913 }
1914 s->motion_val[xy][0] = motion_x;
1915 s->motion_val[xy][1] = motion_y;
1916 s->motion_val[xy + 1][0] = motion_x;
1917 s->motion_val[xy + 1][1] = motion_y;
1918 s->motion_val[xy + wrap][0] = motion_x;
1919 s->motion_val[xy + wrap][1] = motion_y;
1920 s->motion_val[xy + 1 + wrap][0] = motion_x;
1921 s->motion_val[xy + 1 + wrap][1] = motion_y;
1922 }
1923
1924 MPV_decode_mb(s, s->block);
1925
1926 if (++s->mb_x >= s->mb_width) {
1927 if(s->picture_structure==PICT_FRAME){
1928 ff_draw_horiz_band(s, 16*s->mb_y, 16);
1929 }else{
1930 if(!s->first_field){
1931 ff_draw_horiz_band(s, 32*s->mb_y, 32);
1932 }
1933 }
1934
1935 s->mb_x = 0;
1936 s->mb_y++;
1937 }
1938
1939 /* skip mb handling */
1940 if (s->mb_skip_run == -1) {
1941 /* read again increment */
1942 s->mb_skip_run = 0;
1943 for(;;) {
1944 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1945 if (code < 0){
1946 fprintf(stderr, "mb incr damaged\n");
1947 return -1;
1948 }
1949 if (code >= 33) {
1950 if (code == 33) {
1951 s->mb_skip_run += 33;
1952 }else if(code == 35){
1953 if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1954 fprintf(stderr, "slice missmatch\n");
1955 return -1;
1956 }
1957 goto eos; /* end of slice */
1958 }
1959 /* otherwise, stuffing, nothing to do */
1960 } else {
1961 s->mb_skip_run += code;
1962 break;
1963 }
1964 }
1965 }
1966 if(s->mb_y<<field_pic >= s->mb_height){
1967 fprintf(stderr, "slice too long\n");
1968 return -1;
1969 }
1970 }
1971 eos: // end of slice
1972 *buf += get_bits_count(&s->gb)/8 - 1;
1973 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1974 return 0;
1975 }
1976
1977 /**
1978 * handles slice ends.
1979 * @return 1 if it seems to be the last slice of
1980 */
1981 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1982 {
1983 Mpeg1Context *s1 = avctx->priv_data;
1984 MpegEncContext *s = &s1->mpeg_enc_ctx;
1985
1986 /* end of slice reached */
1987 if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1988 /* end of image */
1989
1990 if(s->mpeg2){
1991 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1992 }else
1993 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG1;
1994
1995 ff_er_frame_end(s);
1996
1997 MPV_frame_end(s);
1998
1999 if (s->pict_type == B_TYPE || s->low_delay) {
2000 *pict= *(AVFrame*)&s->current_picture;
2001 ff_print_debug_info(s, s->current_picture_ptr);
2002 } else {
2003 s->picture_number++;
2004 /* latency of 1 frame for I and P frames */
2005 /* XXX: use another variable than picture_number */
2006 if (s->last_picture_ptr != NULL) {
2007 *pict= *(AVFrame*)&s->last_picture;
2008 ff_print_debug_info(s, s->last_picture_ptr);
2009 }
2010 }
2011 return 1;
2012 } else {
2013 return 0;
2014 }
2015 }
2016
2017 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2018 uint8_t *buf, int buf_size)
2019 {
2020 Mpeg1Context *s1 = avctx->priv_data;
2021 MpegEncContext *s = &s1->mpeg_enc_ctx;
2022 int width, height, i, v, j;
2023 float aspect;
2024
2025 init_get_bits(&s->gb, buf, buf_size*8);
2026
2027 width = get_bits(&s->gb, 12);
2028 height = get_bits(&s->gb, 12);
2029 s->aspect_ratio_info= get_bits(&s->gb, 4);
2030 if(!s->mpeg2){
2031 aspect= mpeg1_aspect[s->aspect_ratio_info];
2032 if(aspect!=0.0) avctx->aspect_ratio= width/(aspect*height);
2033 }
2034
2035 s->frame_rate_index = get_bits(&s->gb, 4);
2036 if (s->frame_rate_index == 0)
2037 return -1;
2038 s->bit_rate = get_bits(&s->gb, 18) * 400;
2039 if (get_bits1(&s->gb) == 0) /* marker */
2040 return -1;
2041 if (width <= 0 || height <= 0 ||
2042 (width % 2) != 0 || (height % 2) != 0)
2043 return -1;
2044 if (width != s->width ||
2045 height != s->height) {
2046 /* start new mpeg1 context decoding */
2047 s->out_format = FMT_MPEG1;
2048 if (s1->mpeg_enc_ctx_allocated) {
2049 MPV_common_end(s);
2050 }
2051 s->width = width;
2052 s->height = height;
2053 avctx->has_b_frames= 1;
2054 s->avctx = avctx;
2055 avctx->width = width;
2056 avctx->height = height;
2057 av_reduce(
2058 &avctx->frame_rate,
2059 &avctx->frame_rate_base,
2060 frame_rate_tab[s->frame_rate_index],
2061 MPEG1_FRAME_RATE_BASE, //FIXME store in allready reduced form
2062 1<<30
2063 );
2064 avctx->bit_rate = s->bit_rate;
2065
2066 if (MPV_common_init(s) < 0)
2067 return -1;
2068 s1->mpeg_enc_ctx_allocated = 1;
2069 }
2070
2071 skip_bits(&s->gb, 10); /* vbv_buffer_size */
2072 skip_bits(&s->gb, 1);
2073
2074 /* get matrix */
2075 if (get_bits1(&s->gb)) {
2076 for(i=0;i<64;i++) {
2077 v = get_bits(&s->gb, 8);
2078 j = s->intra_scantable.permutated[i];
2079 s->intra_matrix[j] = v;
2080 s->chroma_intra_matrix[j] = v;
2081 }
2082 #ifdef DEBUG
2083 dprintf("intra matrix present\n");
2084 for(i=0;i<64;i++)
2085 dprintf(" %d", s->intra_matrix[s->intra_scantable.permutated[i]]);
2086 printf("\n");
2087 #endif
2088 } else {
2089 for(i=0;i<64;i++) {
2090 int j= s->dsp.idct_permutation[i];
2091 v = ff_mpeg1_default_intra_matrix[i];
2092 s->intra_matrix[j] = v;
2093 s->chroma_intra_matrix[j] = v;
2094 }
2095 }
2096 if (get_bits1(&s->gb)) {
2097 for(i=0;i<64;i++) {
2098 v = get_bits(&s->gb, 8);
2099 j = s->intra_scantable.permutated[i];
2100 s->inter_matrix[j] = v;
2101 s->chroma_inter_matrix[j] = v;
2102 }
2103 #ifdef DEBUG
2104 dprintf("non intra matrix present\n");
2105 for(i=0;i<64;i++)
2106 dprintf(" %d", s->inter_matrix[s->intra_scantable.permutated[i]]);
2107 printf("\n");
2108 #endif
2109 } else {
2110 for(i=0;i<64;i++) {
2111 int j= s->dsp.idct_permutation[i];
2112 v = ff_mpeg1_default_non_intra_matrix[i];
2113 s->inter_matrix[j] = v;
2114 s->chroma_inter_matrix[j] = v;
2115 }
2116 }
2117
2118 /* we set mpeg2 parameters so that it emulates mpeg1 */
2119 s->progressive_sequence = 1;
2120 s->progressive_frame = 1;
2121 s->picture_structure = PICT_FRAME;
2122 s->frame_pred_frame_dct = 1;
2123 s->mpeg2 = 0;
2124 avctx->sub_id = 1; /* indicates mpeg1 */
2125 return 0;
2126 }
2127
2128 static void mpeg_decode_user_data(AVCodecContext *avctx,
2129 const uint8_t *buf, int buf_size)
2130 {
2131 const uint8_t *p;
2132 int len, flags;
2133 p = buf;
2134 len = buf_size;
2135
2136 /* we parse the DTG active format information */
2137 if (len >= 5 &&
2138 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2139 flags = p[4];
2140 p += 5;
2141 len -= 5;
2142 if (flags & 0x80) {
2143 /* skip event id */
2144 if (len < 2)
2145 return;
2146 p += 2;
2147 len -= 2;
2148 }
2149 if (flags & 0x40) {
2150 if (len < 1)
2151 return;
2152 avctx->dtg_active_format = p[0] & 0x0f;
2153 }
2154 }
2155 }
2156
2157 /**
2158 * finds the end of the current frame in the bitstream.
2159 * @return the position of the first byte of the next frame, or -1
2160 */
2161 static int mpeg1_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
2162 ParseContext *pc= &s->parse_context;
2163 int i;
2164 uint32_t state;
2165
2166 state= pc->state;
2167
2168 i=0;
2169 if(!pc->frame_start_found){
2170 for(i=0; i<buf_size; i++){
2171 state= (state<<8) | buf[i];
2172 if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2173 i++;
2174 pc->frame_start_found=1;
2175 break;
2176 }
2177 }
2178 }
2179
2180 if(pc->frame_start_found){
2181 for(; i<buf_size; i++){
2182 state= (state<<8) | buf[i];
2183 if((state&0xFFFFFF00) == 0x100){
2184 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2185 pc->frame_start_found=0;
2186 pc->state=-1;
2187 return i-3;
2188 }
2189 }
2190 }
2191 }
2192 pc->state= state;
2193 return END_NOT_FOUND;
2194 }
2195
2196 /* handle buffering and image synchronisation */
2197 static int mpeg_decode_frame(AVCodecContext *avctx,
2198 void *data, int *data_size,
2199 uint8_t *buf, int buf_size)
2200 {
2201 Mpeg1Context *s = avctx->priv_data;
2202 uint8_t *buf_end, *buf_ptr;
2203 int ret, start_code, input_size;
2204 AVFrame *picture = data;
2205 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2206 dprintf("fill_buffer\n");
2207
2208 *data_size = 0;
2209
2210 /* special case for last picture */
2211 if (buf_size == 0) {
2212 if (s2->picture_number > 0) {
2213 *picture= *(AVFrame*)&s2->next_picture;
2214
2215 *data_size = sizeof(AVFrame);
2216 }
2217 return 0;
2218 }
2219
2220 if(s2->flags&CODEC_FLAG_TRUNCATED){
2221 int next= mpeg1_find_frame_end(s2, buf, buf_size);
2222
2223 if( ff_combine_frame(s2, next, &buf, &buf_size) < 0 )
2224 return buf_size;
2225 }
2226
2227 buf_ptr = buf;
2228 buf_end = buf + buf_size;
2229
2230 #if 0
2231 if (s->repeat_field % 2 == 1) {
2232 s->repeat_field++;
2233 //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2234 // s2->picture_number, s->repeat_field);
2235 if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2236 *data_size = sizeof(AVPicture);
2237 goto the_end;
2238 }
2239 }
2240 #endif
2241 for(;;) {
2242 /* find start next code */
2243 start_code = find_start_code(&buf_ptr, buf_end);
2244 if (start_code < 0){
2245 if (slice_end(avctx, picture)) {
2246 if(s2->last_picture_ptr) //FIXME merge with the stuff in mpeg_decode_slice
2247 *data_size = sizeof(AVPicture);
2248 }
2249 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2250 }
2251
2252 /* prepare data for next start code */
2253 input_size = buf_end - buf_ptr;
2254 switch(start_code) {
2255 case SEQ_START_CODE:
2256 mpeg1_decode_sequence(avctx, buf_ptr,
2257 input_size);
2258 break;
2259
2260 case PICTURE_START_CODE:
2261 /* we have a complete image : we try to decompress it */
2262 mpeg1_decode_picture(avctx,
2263 buf_ptr, input_size);
2264 break;
2265 case EXT_START_CODE:
2266 mpeg_decode_extension(avctx,
2267 buf_ptr, input_size);
2268 break;
2269 case USER_START_CODE:
2270 mpeg_decode_user_data(avctx,
2271 buf_ptr, input_size);
2272 break;
2273 default:
2274 if (start_code >= SLICE_MIN_START_CODE &&
2275 start_code <= SLICE_MAX_START_CODE) {
2276
2277 /* skip b frames if we dont have reference frames */
2278 if(s2->last_picture_ptr==NULL && s2->pict_type==B_TYPE) break;
2279 /* skip b frames if we are in a hurry */
2280 if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2281 /* skip everything if we are in a hurry>=5 */
2282 if(avctx->hurry_up>=5) break;
2283
2284 if (!s->mpeg_enc_ctx_allocated) break;
2285
2286 ret = mpeg_decode_slice(avctx, picture,
2287 start_code, &buf_ptr, input_size);
2288 emms_c();
2289
2290 if(ret < 0){
2291 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2292 ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
2293 if(ret==DECODE_SLICE_FATAL_ERROR) return -1;
2294 }else{
2295 ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, AC_END|DC_END|MV_END);
2296 }
2297 }
2298 break;
2299 }
2300 }
2301 }
2302
2303 static int mpeg_decode_end(AVCodecContext *avctx)
2304 {
2305 Mpeg1Context *s = avctx->priv_data;
2306
2307 if (s->mpeg_enc_ctx_allocated)
2308 MPV_common_end(&s->mpeg_enc_ctx);
2309 return 0;
2310 }
2311
2312 AVCodec mpeg_decoder = {
2313 "mpegvideo",
2314 CODEC_TYPE_VIDEO,
2315 CODEC_ID_MPEG1VIDEO,
2316 sizeof(Mpeg1Context),
2317 mpeg_decode_init,
2318 NULL,
2319 mpeg_decode_end,
2320 mpeg_decode_frame,
2321 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2322 };