015033bf36f766aa5e211b73df2aacc9e3a631f7
[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 * MPEG1/2 codec
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 #ifdef CONFIG_ENCODERS
52 static void mpeg1_encode_block(MpegEncContext *s,
53 DCTELEM *block,
54 int component);
55 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code); // RAL: f_code parameter added
56 #endif //CONFIG_ENCODERS
57 static void mpeg1_skip_picture(MpegEncContext *s, int pict_num);
58 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
59 DCTELEM *block,
60 int n);
61 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
62 DCTELEM *block,
63 int n);
64 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
65 DCTELEM *block,
66 int n);
67 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
68 DCTELEM *block,
69 int n);
70 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
71
72 #ifdef HAVE_XVMC
73 extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
74 extern int XVMC_field_end(MpegEncContext *s);
75 #endif
76
77 #ifdef CONFIG_ENCODERS
78 static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
79 static uint8_t fcode_tab[MAX_MV*2+1];
80
81 static uint32_t uni_mpeg1_ac_vlc_bits[64*64*2];
82 static uint8_t uni_mpeg1_ac_vlc_len [64*64*2];
83
84 /* simple include everything table for dc, first byte is bits number next 3 are code*/
85 static uint32_t mpeg1_lum_dc_uni[512];
86 static uint32_t mpeg1_chr_dc_uni[512];
87
88 static uint8_t mpeg1_index_run[2][64];
89 static int8_t mpeg1_max_level[2][64];
90 #endif //CONFIG_ENCODERS
91
92 static void init_2d_vlc_rl(RLTable *rl)
93 {
94 int i;
95
96 init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2,
97 &rl->table_vlc[0][1], 4, 2,
98 &rl->table_vlc[0][0], 4, 2);
99
100
101 rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
102 for(i=0; i<rl->vlc.table_size; i++){
103 int code= rl->vlc.table[i][0];
104 int len = rl->vlc.table[i][1];
105 int level, run;
106
107 if(len==0){ // illegal code
108 run= 65;
109 level= MAX_LEVEL;
110 }else if(len<0){ //more bits needed
111 run= 0;
112 level= code;
113 }else{
114 if(code==rl->n){ //esc
115 run= 65;
116 level= 0;
117 }else if(code==rl->n+1){ //eob
118 run= 0;
119 level= 127;
120 }else{
121 run= rl->table_run [code] + 1;
122 level= rl->table_level[code];
123 }
124 }
125 rl->rl_vlc[0][i].len= len;
126 rl->rl_vlc[0][i].level= level;
127 rl->rl_vlc[0][i].run= run;
128 }
129 }
130
131 #ifdef CONFIG_ENCODERS
132 static void init_uni_ac_vlc(RLTable *rl, uint32_t *uni_ac_vlc_bits, uint8_t *uni_ac_vlc_len){
133 int i;
134
135 for(i=0; i<128; i++){
136 int level= i-64;
137 int run;
138 for(run=0; run<64; run++){
139 int len, bits, code;
140
141 int alevel= ABS(level);
142 int sign= (level>>31)&1;
143
144 if (alevel > rl->max_level[0][run])
145 code= 111; /*rl->n*/
146 else
147 code= rl->index_run[0][run] + alevel - 1;
148
149 if (code < 111 /* rl->n */) {
150 /* store the vlc & sign at once */
151 len= mpeg1_vlc[code][1]+1;
152 bits= (mpeg1_vlc[code][0]<<1) + sign;
153 } else {
154 len= mpeg1_vlc[111/*rl->n*/][1]+6;
155 bits= mpeg1_vlc[111/*rl->n*/][0]<<6;
156
157 bits|= run;
158 if (alevel < 128) {
159 bits<<=8; len+=8;
160 bits|= level & 0xff;
161 } else {
162 bits<<=16; len+=16;
163 bits|= level & 0xff;
164 if (level < 0) {
165 bits|= 0x8001 + level + 255;
166 } else {
167 bits|= level & 0xffff;
168 }
169 }
170 }
171
172 uni_ac_vlc_bits[UNI_AC_ENC_INDEX(run, i)]= bits;
173 uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
174 }
175 }
176 }
177
178 static void put_header(MpegEncContext *s, int header)
179 {
180 align_put_bits(&s->pb);
181 put_bits(&s->pb, 16, header>>16);
182 put_bits(&s->pb, 16, header&0xFFFF);
183 }
184
185 /* put sequence header if needed */
186 static void mpeg1_encode_sequence_header(MpegEncContext *s)
187 {
188 unsigned int vbv_buffer_size;
189 unsigned int fps, v;
190 int n, i;
191 uint64_t time_code;
192 float best_aspect_error= 1E10;
193 float aspect_ratio= s->avctx->aspect_ratio;
194 int constraint_parameter_flag;
195
196 if(aspect_ratio==0.0) aspect_ratio= s->width / (float)s->height; //pixel aspect 1:1 (VGA)
197
198 if (s->current_picture.key_frame) {
199 /* mpeg1 header repeated every gop */
200 put_header(s, SEQ_START_CODE);
201
202 /* search closest frame rate */
203 {
204 int i, dmin, d;
205 s->frame_rate_index = 0;
206 dmin = 0x7fffffff;
207 for(i=1;i<14;i++) {
208 if(s->avctx->strict_std_compliance >= 0 && i>=9) break;
209
210 d = abs(MPEG1_FRAME_RATE_BASE*(int64_t)s->avctx->frame_rate/s->avctx->frame_rate_base - frame_rate_tab[i]);
211 if (d < dmin) {
212 dmin = d;
213 s->frame_rate_index = i;
214 }
215 }
216 }
217
218 put_bits(&s->pb, 12, s->width);
219 put_bits(&s->pb, 12, s->height);
220
221 for(i=1; i<15; i++){
222 float error= mpeg1_aspect[i] - s->width/(s->height*aspect_ratio);
223 error= ABS(error);
224
225 if(error < best_aspect_error){
226 best_aspect_error= error;
227 s->aspect_ratio_info= i;
228 }
229 }
230
231 put_bits(&s->pb, 4, s->aspect_ratio_info);
232 put_bits(&s->pb, 4, s->frame_rate_index);
233
234 if(s->avctx->rc_max_rate){
235 v = (s->avctx->rc_max_rate + 399) / 400;
236 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
237 v = 0x3ffff;
238 }else{
239 v= 0x3FFFF;
240 }
241
242 if(s->avctx->rc_buffer_size)
243 vbv_buffer_size = s->avctx->rc_buffer_size;
244 else
245 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
246 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
247 vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
248
249 put_bits(&s->pb, 18, v & 0x3FFFF);
250 put_bits(&s->pb, 1, 1); /* marker */
251 put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
252
253 constraint_parameter_flag=
254 s->width <= 768 && s->height <= 576 &&
255 s->mb_width * s->mb_height <= 396 &&
256 s->mb_width * s->mb_height * frame_rate_tab[s->frame_rate_index] <= MPEG1_FRAME_RATE_BASE*396*25 &&
257 frame_rate_tab[s->frame_rate_index] <= MPEG1_FRAME_RATE_BASE*30 &&
258 vbv_buffer_size <= 20 &&
259 v <= 1856000/400 &&
260 s->codec_id == CODEC_ID_MPEG1VIDEO;
261
262 put_bits(&s->pb, 1, constraint_parameter_flag);
263
264 ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
265 ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
266
267 if(s->codec_id == CODEC_ID_MPEG2VIDEO){
268 put_header(s, EXT_START_CODE);
269 put_bits(&s->pb, 4, 1); //seq ext
270 put_bits(&s->pb, 1, 0); //esc
271 put_bits(&s->pb, 3, 4); //profile
272 put_bits(&s->pb, 4, 8); //level
273 put_bits(&s->pb, 1, s->progressive_sequence=1);
274 put_bits(&s->pb, 2, 1); //chroma format 4:2:0
275 put_bits(&s->pb, 2, 0); //horizontal size ext
276 put_bits(&s->pb, 2, 0); //vertical size ext
277 put_bits(&s->pb, 12, v>>18); //bitrate ext
278 put_bits(&s->pb, 1, 1); //marker
279 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
280 put_bits(&s->pb, 1, s->low_delay);
281 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
282 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
283 }
284
285 put_header(s, GOP_START_CODE);
286 put_bits(&s->pb, 1, 0); /* do drop frame */
287 /* time code : we must convert from the real frame rate to a
288 fake mpeg frame rate in case of low frame rate */
289 fps = frame_rate_tab[s->frame_rate_index];
290 time_code = (int64_t)s->fake_picture_number * MPEG1_FRAME_RATE_BASE;
291 s->gop_picture_number = s->fake_picture_number;
292 put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
293 put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
294 put_bits(&s->pb, 1, 1);
295 put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
296 put_bits(&s->pb, 6, (uint32_t)((time_code % fps) / MPEG1_FRAME_RATE_BASE));
297 put_bits(&s->pb, 1, 0); /* closed gop */
298 put_bits(&s->pb, 1, 0); /* broken link */
299 }
300
301 if (s->avctx->frame_rate < (24 * s->avctx->frame_rate_base) && s->picture_number > 0) {
302 /* insert empty P pictures to slow down to the desired
303 frame rate. Each fake pictures takes about 20 bytes */
304 fps = frame_rate_tab[s->frame_rate_index];
305 n = av_rescale((int64_t)s->picture_number * s->avctx->frame_rate_base, fps, s->avctx->frame_rate) / MPEG1_FRAME_RATE_BASE - 1;
306 while (s->fake_picture_number < n) {
307 mpeg1_skip_picture(s, s->fake_picture_number -
308 s->gop_picture_number);
309 s->fake_picture_number++;
310 }
311
312 }
313 }
314
315 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
316 while (run >= 33) {
317 put_bits(&s->pb, 11, 0x008);
318 run -= 33;
319 }
320 put_bits(&s->pb, mbAddrIncrTable[run][1],
321 mbAddrIncrTable[run][0]);
322 }
323
324 /* insert a fake P picture */
325 static void mpeg1_skip_picture(MpegEncContext *s, int pict_num)
326 {
327 assert(s->codec_id == CODEC_ID_MPEG1VIDEO); // mpeg2 can do these repeat things
328
329 /* mpeg1 picture header */
330 put_header(s, PICTURE_START_CODE);
331 /* temporal reference */
332 put_bits(&s->pb, 10, pict_num & 0x3ff);
333
334 put_bits(&s->pb, 3, P_TYPE);
335 put_bits(&s->pb, 16, 0xffff); /* non constant bit rate */
336
337 put_bits(&s->pb, 1, 1); /* integer coordinates */
338 put_bits(&s->pb, 3, 1); /* forward_f_code */
339
340 put_bits(&s->pb, 1, 0); /* extra bit picture */
341
342 /* only one slice */
343 put_header(s, SLICE_MIN_START_CODE);
344 put_bits(&s->pb, 5, 1); /* quantizer scale */
345 put_bits(&s->pb, 1, 0); /* slice extra information */
346
347 encode_mb_skip_run(s, 0);
348
349 /* empty macroblock */
350 put_bits(&s->pb, 3, 1); /* motion only */
351
352 /* zero motion x & y */
353 put_bits(&s->pb, 1, 1);
354 put_bits(&s->pb, 1, 1);
355
356 /* output a number of empty slice */
357 encode_mb_skip_run(s, s->mb_width * s->mb_height - 2);
358
359 /* empty macroblock */
360 put_bits(&s->pb, 3, 1); /* motion only */
361
362 /* zero motion x & y */
363 put_bits(&s->pb, 1, 1);
364 put_bits(&s->pb, 1, 1);
365 }
366 #endif //CONFIG_ENCODERS
367
368 static void common_init(MpegEncContext *s)
369 {
370 s->y_dc_scale_table=
371 s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
372 }
373
374 void ff_mpeg1_clean_buffers(MpegEncContext *s){
375 s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
376 s->last_dc[1] = s->last_dc[0];
377 s->last_dc[2] = s->last_dc[0];
378 memset(s->last_mv, 0, sizeof(s->last_mv));
379 }
380
381 #ifdef CONFIG_ENCODERS
382
383 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
384 put_header(s, SLICE_MIN_START_CODE + s->mb_y);
385 put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
386 put_bits(&s->pb, 1, 0); /* slice extra information */
387 }
388
389 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
390 {
391 mpeg1_encode_sequence_header(s);
392
393 /* mpeg1 picture header */
394 put_header(s, PICTURE_START_CODE);
395 /* temporal reference */
396
397 // RAL: s->picture_number instead of s->fake_picture_number
398 put_bits(&s->pb, 10, (s->picture_number -
399 s->gop_picture_number) & 0x3ff);
400 s->fake_picture_number++;
401
402 put_bits(&s->pb, 3, s->pict_type);
403 put_bits(&s->pb, 16, 0xffff); /* non constant bit rate */
404
405 // RAL: Forward f_code also needed for B frames
406 if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
407 put_bits(&s->pb, 1, 0); /* half pel coordinates */
408 if(s->codec_id == CODEC_ID_MPEG1VIDEO)
409 put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
410 else
411 put_bits(&s->pb, 3, 7); /* forward_f_code */
412 }
413
414 // RAL: Backward f_code necessary for B frames
415 if (s->pict_type == B_TYPE) {
416 put_bits(&s->pb, 1, 0); /* half pel coordinates */
417 if(s->codec_id == CODEC_ID_MPEG1VIDEO)
418 put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
419 else
420 put_bits(&s->pb, 3, 7); /* backward_f_code */
421 }
422
423 put_bits(&s->pb, 1, 0); /* extra bit picture */
424
425 if(s->codec_id == CODEC_ID_MPEG2VIDEO){
426 put_header(s, EXT_START_CODE);
427 put_bits(&s->pb, 4, 8); //pic ext
428 if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
429 put_bits(&s->pb, 4, s->f_code);
430 put_bits(&s->pb, 4, s->f_code);
431 }else{
432 put_bits(&s->pb, 8, 255);
433 }
434 if (s->pict_type == B_TYPE) {
435 put_bits(&s->pb, 4, s->b_code);
436 put_bits(&s->pb, 4, s->b_code);
437 }else{
438 put_bits(&s->pb, 8, 255);
439 }
440 put_bits(&s->pb, 2, s->intra_dc_precision);
441 put_bits(&s->pb, 2, s->picture_structure= PICT_FRAME);
442 put_bits(&s->pb, 1, s->top_field_first);
443 put_bits(&s->pb, 1, s->frame_pred_frame_dct= 1);
444 put_bits(&s->pb, 1, s->concealment_motion_vectors);
445 put_bits(&s->pb, 1, s->q_scale_type);
446 put_bits(&s->pb, 1, s->intra_vlc_format);
447 put_bits(&s->pb, 1, s->alternate_scan);
448 put_bits(&s->pb, 1, s->repeat_first_field);
449 put_bits(&s->pb, 1, s->chroma_420_type=1);
450 put_bits(&s->pb, 1, s->progressive_frame=1);
451 put_bits(&s->pb, 1, 0); //composite_display_flag
452 }
453
454 s->mb_y=0;
455 ff_mpeg1_encode_slice_header(s);
456 }
457
458 void mpeg1_encode_mb(MpegEncContext *s,
459 DCTELEM block[6][64],
460 int motion_x, int motion_y)
461 {
462 int i, cbp;
463 const int mb_x = s->mb_x;
464 const int mb_y = s->mb_y;
465 const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
466
467 /* compute cbp */
468 cbp = 0;
469 for(i=0;i<6;i++) {
470 if (s->block_last_index[i] >= 0)
471 cbp |= 1 << (5 - i);
472 }
473
474 if (cbp == 0 && !first_mb && (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
475 ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
476 (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) |
477 ((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))) {
478 s->mb_skip_run++;
479 s->qscale -= s->dquant;
480 s->skip_count++;
481 s->misc_bits++;
482 s->last_bits++;
483 } else {
484 if(first_mb){
485 assert(s->mb_skip_run == 0);
486 encode_mb_skip_run(s, s->mb_x);
487 }else{
488 encode_mb_skip_run(s, s->mb_skip_run);
489 }
490
491 if (s->pict_type == I_TYPE) {
492 if(s->dquant && cbp){
493 put_bits(&s->pb, 2, 1); /* macroblock_type : macroblock_quant = 1 */
494 put_bits(&s->pb, 5, s->qscale);
495 }else{
496 put_bits(&s->pb, 1, 1); /* macroblock_type : macroblock_quant = 0 */
497 s->qscale -= s->dquant;
498 }
499 s->misc_bits+= get_bits_diff(s);
500 s->i_count++;
501 } else if (s->mb_intra) {
502 if(s->dquant && cbp){
503 put_bits(&s->pb, 6, 0x01);
504 put_bits(&s->pb, 5, s->qscale);
505 }else{
506 put_bits(&s->pb, 5, 0x03);
507 s->qscale -= s->dquant;
508 }
509 s->misc_bits+= get_bits_diff(s);
510 s->i_count++;
511 s->last_mv[0][0][0] =
512 s->last_mv[0][0][1] = 0;
513 } else if (s->pict_type == P_TYPE) {
514 if (cbp != 0) {
515 if (motion_x == 0 && motion_y == 0) {
516 if(s->dquant){
517 put_bits(&s->pb, 5, 1); /* macroblock_pattern & quant */
518 put_bits(&s->pb, 5, s->qscale);
519 }else{
520 put_bits(&s->pb, 2, 1); /* macroblock_pattern only */
521 }
522 s->misc_bits+= get_bits_diff(s);
523 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
524 } else {
525 if(s->dquant){
526 put_bits(&s->pb, 5, 2); /* motion + cbp */
527 put_bits(&s->pb, 5, s->qscale);
528 }else{
529 put_bits(&s->pb, 1, 1); /* motion + cbp */
530 }
531 s->misc_bits+= get_bits_diff(s);
532 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added
533 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added
534 s->mv_bits+= get_bits_diff(s);
535 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
536 }
537 } else {
538 put_bits(&s->pb, 3, 1); /* motion only */
539 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added
540 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added
541 s->qscale -= s->dquant;
542 s->mv_bits+= get_bits_diff(s);
543 }
544 s->f_count++;
545 } else
546 { // RAL: All the following bloc added for B frames:
547 if (cbp != 0)
548 { // With coded bloc pattern
549 if (s->mv_dir == (MV_DIR_FORWARD | MV_DIR_BACKWARD))
550 { // Bi-directional motion
551 if (s->dquant)
552 { // With QScale
553 put_bits(&s->pb, 5, 2);
554 put_bits(&s->pb, 5, s->qscale);
555 }
556 else // Without QScale
557 put_bits(&s->pb, 2, 3);
558 s->misc_bits += get_bits_diff(s);
559 mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
560 mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
561 mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
562 mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
563 s->b_count++;
564 s->f_count++;
565 s->mv_bits += get_bits_diff(s);
566 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
567 }
568 else if (s->mv_dir == MV_DIR_BACKWARD)
569 { // Backward motion
570 if (s->dquant)
571 { // With QScale
572 put_bits(&s->pb, 6, 2);
573 put_bits(&s->pb, 5, s->qscale);
574 }
575 else // Without QScale
576 put_bits(&s->pb, 3, 3);
577 s->misc_bits += get_bits_diff(s);
578 mpeg1_encode_motion(s, motion_x - s->last_mv[1][0][0], s->b_code);
579 mpeg1_encode_motion(s, motion_y - s->last_mv[1][0][1], s->b_code);
580 s->b_count++;
581 s->mv_bits += get_bits_diff(s);
582 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
583 }
584 else if (s->mv_dir == MV_DIR_FORWARD)
585 { // Forward motion
586 if (s->dquant)
587 { // With QScale
588 put_bits(&s->pb, 6, 3);
589 put_bits(&s->pb, 5, s->qscale);
590 }
591 else // Without QScale
592 put_bits(&s->pb, 4, 3);
593 s->misc_bits += get_bits_diff(s);
594 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);
595 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);
596 s->f_count++;
597 s->mv_bits += get_bits_diff(s);
598 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
599 }
600 }
601 else
602 { // No coded bloc pattern
603 if (s->mv_dir == (MV_DIR_FORWARD | MV_DIR_BACKWARD))
604 { // Bi-directional motion
605 put_bits(&s->pb, 2, 2); /* backward & forward motion */
606 mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
607 mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
608 mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
609 mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
610 s->b_count++;
611 s->f_count++;
612 }
613 else if (s->mv_dir == MV_DIR_BACKWARD)
614 { // Backward motion
615 put_bits(&s->pb, 3, 2); /* backward motion only */
616 mpeg1_encode_motion(s, motion_x - s->last_mv[1][0][0], s->b_code);
617 mpeg1_encode_motion(s, motion_y - s->last_mv[1][0][1], s->b_code);
618 s->b_count++;
619 }
620 else if (s->mv_dir == MV_DIR_FORWARD)
621 { // Forward motion
622 put_bits(&s->pb, 4, 2); /* forward motion only */
623 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);
624 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);
625 s->f_count++;
626 }
627 s->qscale -= s->dquant;
628 s->mv_bits += get_bits_diff(s);
629 }
630 // End of bloc from RAL
631 }
632 for(i=0;i<6;i++) {
633 if (cbp & (1 << (5 - i))) {
634 mpeg1_encode_block(s, block[i], i);
635 }
636 }
637 s->mb_skip_run = 0;
638 if(s->mb_intra)
639 s->i_tex_bits+= get_bits_diff(s);
640 else
641 s->p_tex_bits+= get_bits_diff(s);
642 }
643
644 // RAL: By this:
645 if (s->mv_dir & MV_DIR_FORWARD)
646 {
647 s->last_mv[0][0][0]= s->mv[0][0][0];
648 s->last_mv[0][0][1]= s->mv[0][0][1];
649 }
650 if (s->mv_dir & MV_DIR_BACKWARD)
651 {
652 s->last_mv[1][0][0]= s->mv[1][0][0];
653 s->last_mv[1][0][1]= s->mv[1][0][1];
654 }
655 }
656
657 // RAL: Parameter added: f_or_b_code
658 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
659 {
660 int code, bit_size, l, m, bits, range, sign;
661
662 if (val == 0) {
663 /* zero vector */
664 code = 0;
665 put_bits(&s->pb,
666 mbMotionVectorTable[0][1],
667 mbMotionVectorTable[0][0]);
668 } else {
669 bit_size = f_or_b_code - 1;
670 range = 1 << bit_size;
671 /* modulo encoding */
672 l = 16 * range;
673 m = 2 * l;
674 if (val < -l) {
675 val += m;
676 } else if (val >= l) {
677 val -= m;
678 }
679
680 if (val >= 0) {
681 val--;
682 code = (val >> bit_size) + 1;
683 bits = val & (range - 1);
684 sign = 0;
685 } else {
686 val = -val;
687 val--;
688 code = (val >> bit_size) + 1;
689 bits = val & (range - 1);
690 sign = 1;
691 }
692
693 assert(code > 0 && code <= 16);
694
695 put_bits(&s->pb,
696 mbMotionVectorTable[code][1],
697 mbMotionVectorTable[code][0]);
698
699 put_bits(&s->pb, 1, sign);
700 if (bit_size > 0) {
701 put_bits(&s->pb, bit_size, bits);
702 }
703 }
704 }
705
706 void ff_mpeg1_encode_init(MpegEncContext *s)
707 {
708 static int done=0;
709
710 common_init(s);
711
712 if(!done){
713 int f_code;
714 int mv;
715 int i;
716
717 done=1;
718 init_rl(&rl_mpeg1);
719
720 for(i=0; i<64; i++)
721 {
722 mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
723 mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
724 }
725
726 init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_bits, uni_mpeg1_ac_vlc_len);
727
728 /* build unified dc encoding tables */
729 for(i=-255; i<256; i++)
730 {
731 int adiff, index;
732 int bits, code;
733 int diff=i;
734
735 adiff = ABS(diff);
736 if(diff<0) diff--;
737 index = vlc_dc_table[adiff];
738
739 bits= vlc_dc_lum_bits[index] + index;
740 code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
741 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
742
743 bits= vlc_dc_chroma_bits[index] + index;
744 code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
745 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
746 }
747
748 mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
749
750 for(f_code=1; f_code<=MAX_FCODE; f_code++){
751 for(mv=-MAX_MV; mv<=MAX_MV; mv++){
752 int len;
753
754 if(mv==0) len= mbMotionVectorTable[0][1];
755 else{
756 int val, bit_size, range, code;
757
758 bit_size = s->f_code - 1;
759 range = 1 << bit_size;
760
761 val=mv;
762 if (val < 0)
763 val = -val;
764 val--;
765 code = (val >> bit_size) + 1;
766 if(code<17){
767 len= mbMotionVectorTable[code][1] + 1 + bit_size;
768 }else{
769 len= mbMotionVectorTable[16][1] + 2 + bit_size;
770 }
771 }
772
773 mv_penalty[f_code][mv+MAX_MV]= len;
774 }
775 }
776
777
778 for(f_code=MAX_FCODE; f_code>0; f_code--){
779 for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
780 fcode_tab[mv+MAX_MV]= f_code;
781 }
782 }
783 }
784 s->me.mv_penalty= mv_penalty;
785 s->fcode_tab= fcode_tab;
786 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
787 s->min_qcoeff=-255;
788 s->max_qcoeff= 255;
789 }else{
790 s->min_qcoeff=-2047;
791 s->max_qcoeff= 2047;
792 }
793 s->intra_ac_vlc_length=
794 s->inter_ac_vlc_length=
795 s->intra_ac_vlc_last_length=
796 s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
797 }
798
799 static inline void encode_dc(MpegEncContext *s, int diff, int component)
800 {
801 if (component == 0) {
802 put_bits(
803 &s->pb,
804 mpeg1_lum_dc_uni[diff+255]&0xFF,
805 mpeg1_lum_dc_uni[diff+255]>>8);
806 } else {
807 put_bits(
808 &s->pb,
809 mpeg1_chr_dc_uni[diff+255]&0xFF,
810 mpeg1_chr_dc_uni[diff+255]>>8);
811 }
812 }
813
814 static void mpeg1_encode_block(MpegEncContext *s,
815 DCTELEM *block,
816 int n)
817 {
818 int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
819 int code, component;
820 // RLTable *rl = &rl_mpeg1;
821
822 last_index = s->block_last_index[n];
823
824 /* DC coef */
825 if (s->mb_intra) {
826 component = (n <= 3 ? 0 : n - 4 + 1);
827 dc = block[0]; /* overflow is impossible */
828 diff = dc - s->last_dc[component];
829 encode_dc(s, diff, component);
830 s->last_dc[component] = dc;
831 i = 1;
832 /*
833 if (s->intra_vlc_format)
834 rl = &rl_mpeg2;
835 else
836 rl = &rl_mpeg1;
837 */
838 } else {
839 /* encode the first coefficient : needs to be done here because
840 it is handled slightly differently */
841 level = block[0];
842 if (abs(level) == 1) {
843 code = ((uint32_t)level >> 31); /* the sign bit */
844 put_bits(&s->pb, 2, code | 0x02);
845 i = 1;
846 } else {
847 i = 0;
848 last_non_zero = -1;
849 goto next_coef;
850 }
851 }
852
853 /* now quantify & encode AC coefs */
854 last_non_zero = i - 1;
855
856 for(;i<=last_index;i++) {
857 j = s->intra_scantable.permutated[i];
858 level = block[j];
859 next_coef:
860 #if 0
861 if (level != 0)
862 dprintf("level[%d]=%d\n", i, level);
863 #endif
864 /* encode using VLC */
865 if (level != 0) {
866 run = i - last_non_zero - 1;
867
868 alevel= level;
869 MASK_ABS(sign, alevel)
870 sign&=1;
871
872 // code = get_rl_index(rl, 0, run, alevel);
873 if (alevel <= mpeg1_max_level[0][run]){
874 code= mpeg1_index_run[0][run] + alevel - 1;
875 /* store the vlc & sign at once */
876 put_bits(&s->pb, mpeg1_vlc[code][1]+1, (mpeg1_vlc[code][0]<<1) + sign);
877 } else {
878 /* escape seems to be pretty rare <5% so i dont optimize it */
879 put_bits(&s->pb, mpeg1_vlc[111/*rl->n*/][1], mpeg1_vlc[111/*rl->n*/][0]);
880 /* escape: only clip in this case */
881 put_bits(&s->pb, 6, run);
882 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
883 if (alevel < 128) {
884 put_bits(&s->pb, 8, level & 0xff);
885 } else {
886 if (level < 0) {
887 put_bits(&s->pb, 16, 0x8001 + level + 255);
888 } else {
889 put_bits(&s->pb, 16, level & 0xffff);
890 }
891 }
892 }else{
893 put_bits(&s->pb, 12, level & 0xfff);
894 }
895 }
896 last_non_zero = i;
897 }
898 }
899 /* end of block */
900 put_bits(&s->pb, 2, 0x2);
901 }
902 #endif //CONFIG_ENCODERS
903
904 /******************************************/
905 /* decoding */
906
907 static VLC dc_lum_vlc;
908 static VLC dc_chroma_vlc;
909 static VLC mv_vlc;
910 static VLC mbincr_vlc;
911 static VLC mb_ptype_vlc;
912 static VLC mb_btype_vlc;
913 static VLC mb_pat_vlc;
914
915 static void init_vlcs()
916 {
917 static int done = 0;
918
919 if (!done) {
920 done = 1;
921
922 init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
923 vlc_dc_lum_bits, 1, 1,
924 vlc_dc_lum_code, 2, 2);
925 init_vlc(&dc_chroma_vlc, DC_VLC_BITS, 12,
926 vlc_dc_chroma_bits, 1, 1,
927 vlc_dc_chroma_code, 2, 2);
928 init_vlc(&mv_vlc, MV_VLC_BITS, 17,
929 &mbMotionVectorTable[0][1], 2, 1,
930 &mbMotionVectorTable[0][0], 2, 1);
931 init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
932 &mbAddrIncrTable[0][1], 2, 1,
933 &mbAddrIncrTable[0][0], 2, 1);
934 init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 63,
935 &mbPatTable[0][1], 2, 1,
936 &mbPatTable[0][0], 2, 1);
937
938 init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
939 &table_mb_ptype[0][1], 2, 1,
940 &table_mb_ptype[0][0], 2, 1);
941 init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
942 &table_mb_btype[0][1], 2, 1,
943 &table_mb_btype[0][0], 2, 1);
944 init_rl(&rl_mpeg1);
945 init_rl(&rl_mpeg2);
946
947 init_2d_vlc_rl(&rl_mpeg1);
948 init_2d_vlc_rl(&rl_mpeg2);
949 }
950 }
951
952 static inline int get_dmv(MpegEncContext *s)
953 {
954 if(get_bits1(&s->gb))
955 return 1 - (get_bits1(&s->gb) << 1);
956 else
957 return 0;
958 }
959
960 static inline int get_qscale(MpegEncContext *s)
961 {
962 int qscale = get_bits(&s->gb, 5);
963 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
964 if (s->q_scale_type) {
965 return non_linear_qscale[qscale];
966 } else {
967 return qscale << 1;
968 }
969 }
970 return qscale;
971 }
972
973 /* motion type (for mpeg2) */
974 #define MT_FIELD 1
975 #define MT_FRAME 2
976 #define MT_16X8 2
977 #define MT_DMV 3
978
979 static int mpeg_decode_mb(MpegEncContext *s,
980 DCTELEM block[6][64])
981 {
982 int i, j, k, cbp, val, mb_type, motion_type;
983
984 dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
985
986 assert(s->mb_skiped==0);
987
988 if (s->mb_skip_run-- != 0) {
989 if(s->pict_type == I_TYPE){
990 fprintf(stderr, "skiped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
991 return -1;
992 }
993
994 /* skip mb */
995 s->mb_intra = 0;
996 for(i=0;i<6;i++)
997 s->block_last_index[i] = -1;
998 s->mv_type = MV_TYPE_16X16;
999 if (s->pict_type == P_TYPE) {
1000 /* if P type, zero motion vector is implied */
1001 s->mv_dir = MV_DIR_FORWARD;
1002 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1003 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1004 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1005 s->mb_skiped = 1;
1006 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1007 } else {
1008 /* if B type, reuse previous vectors and directions */
1009 s->mv[0][0][0] = s->last_mv[0][0][0];
1010 s->mv[0][0][1] = s->last_mv[0][0][1];
1011 s->mv[1][0][0] = s->last_mv[1][0][0];
1012 s->mv[1][0][1] = s->last_mv[1][0][1];
1013
1014 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
1015 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1] | MB_TYPE_SKIP;
1016 // assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1017
1018 if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
1019 s->mb_skiped = 1;
1020 }
1021
1022 return 0;
1023 }
1024
1025 switch(s->pict_type) {
1026 default:
1027 case I_TYPE:
1028 if (get_bits1(&s->gb) == 0) {
1029 if (get_bits1(&s->gb) == 0){
1030 fprintf(stderr, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1031 return -1;
1032 }
1033 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1034 } else {
1035 mb_type = MB_TYPE_INTRA;
1036 }
1037 break;
1038 case P_TYPE:
1039 mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1040 if (mb_type < 0){
1041 fprintf(stderr, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1042 return -1;
1043 }
1044 mb_type = ptype2mb_type[ mb_type ];
1045 break;
1046 case B_TYPE:
1047 mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1048 if (mb_type < 0){
1049 fprintf(stderr, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1050 return -1;
1051 }
1052 mb_type = btype2mb_type[ mb_type ];
1053 break;
1054 }
1055 dprintf("mb_type=%x\n", mb_type);
1056 // motion_type = 0; /* avoid warning */
1057 if (IS_INTRA(mb_type)) {
1058 /* compute dct type */
1059 if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1060 !s->frame_pred_frame_dct) {
1061 s->interlaced_dct = get_bits1(&s->gb);
1062 }
1063
1064 if (IS_QUANT(mb_type))
1065 s->qscale = get_qscale(s);
1066
1067 if (s->concealment_motion_vectors) {
1068 /* just parse them */
1069 if (s->picture_structure != PICT_FRAME)
1070 skip_bits1(&s->gb); /* field select */
1071
1072 s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
1073 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1074 s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
1075 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1076
1077 skip_bits1(&s->gb); /* marker */
1078 }else
1079 memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1080 s->mb_intra = 1;
1081
1082 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1083 for(i=0;i<6;i++) {
1084 if (mpeg2_decode_block_intra(s, block[i], i) < 0)
1085 return -1;
1086 }
1087 } else {
1088 for(i=0;i<6;i++) {
1089 if (mpeg1_decode_block_intra(s, block[i], i) < 0)
1090 return -1;
1091 }
1092 }
1093 } else {
1094 if (mb_type & MB_TYPE_ZERO_MV){
1095 assert(mb_type & MB_TYPE_PAT);
1096
1097 /* compute dct type */
1098 if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1099 !s->frame_pred_frame_dct) {
1100 s->interlaced_dct = get_bits1(&s->gb);
1101 }
1102
1103 if (IS_QUANT(mb_type))
1104 s->qscale = get_qscale(s);
1105
1106 s->mv_dir = MV_DIR_FORWARD;
1107 s->mv_type = MV_TYPE_16X16;
1108 s->last_mv[0][0][0] = 0;
1109 s->last_mv[0][0][1] = 0;
1110 s->last_mv[0][1][0] = 0;
1111 s->last_mv[0][1][1] = 0;
1112 s->mv[0][0][0] = 0;
1113 s->mv[0][0][1] = 0;
1114 }else{
1115 assert(mb_type & MB_TYPE_L0L1);
1116 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1117 /* get additionnal motion vector type */
1118 if (s->frame_pred_frame_dct)
1119 motion_type = MT_FRAME;
1120 else{
1121 motion_type = get_bits(&s->gb, 2);
1122 }
1123
1124 /* compute dct type */
1125 if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1126 !s->frame_pred_frame_dct && IS_PAT(mb_type)) {
1127 s->interlaced_dct = get_bits1(&s->gb);
1128 }
1129
1130 if (IS_QUANT(mb_type))
1131 s->qscale = get_qscale(s);
1132
1133 /* motion vectors */
1134 s->mv_dir = 0;
1135 for(i=0;i<2;i++) {
1136 if (USES_LIST(mb_type, i)) {
1137 s->mv_dir |= (MV_DIR_FORWARD >> i);
1138 dprintf("motion_type=%d\n", motion_type);
1139 switch(motion_type) {
1140 case MT_FRAME: /* or MT_16X8 */
1141 if (s->picture_structure == PICT_FRAME) {
1142 /* MT_FRAME */
1143 mb_type |= MB_TYPE_16x16;
1144 s->mv_type = MV_TYPE_16X16;
1145 s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
1146 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1147 s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
1148 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1149 /* full_pel: only for mpeg1 */
1150 if (s->full_pel[i]){
1151 s->mv[i][0][0] <<= 1;
1152 s->mv[i][0][1] <<= 1;
1153 }
1154 } else {
1155 /* MT_16X8 */
1156 mb_type |= MB_TYPE_16x8;
1157 s->mv_type = MV_TYPE_16X8;
1158 for(j=0;j<2;j++) {
1159 s->field_select[i][j] = get_bits1(&s->gb);
1160 for(k=0;k<2;k++) {
1161 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1162 s->last_mv[i][j][k]);
1163 s->last_mv[i][j][k] = val;
1164 s->mv[i][j][k] = val;
1165 }
1166 }
1167 }
1168 break;
1169 case MT_FIELD:
1170 s->mv_type = MV_TYPE_FIELD;
1171 if (s->picture_structure == PICT_FRAME) {
1172 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1173 for(j=0;j<2;j++) {
1174 s->field_select[i][j] = get_bits1(&s->gb);
1175 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1176 s->last_mv[i][j][0]);
1177 s->last_mv[i][j][0] = val;
1178 s->mv[i][j][0] = val;
1179 dprintf("fmx=%d\n", val);
1180 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1181 s->last_mv[i][j][1] >> 1);
1182 s->last_mv[i][j][1] = val << 1;
1183 s->mv[i][j][1] = val;
1184 dprintf("fmy=%d\n", val);
1185 }
1186 } else {
1187 mb_type |= MB_TYPE_16x16;
1188 s->field_select[i][0] = get_bits1(&s->gb);
1189 for(k=0;k<2;k++) {
1190 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1191 s->last_mv[i][0][k]);
1192 s->last_mv[i][0][k] = val;
1193 s->last_mv[i][1][k] = val;
1194 s->mv[i][0][k] = val;
1195 }
1196 }
1197 break;
1198 case MT_DMV:
1199 {
1200 int dmx, dmy, mx, my, m;
1201
1202 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1203 s->last_mv[i][0][0]);
1204 s->last_mv[i][0][0] = mx;
1205 s->last_mv[i][1][0] = mx;
1206 dmx = get_dmv(s);
1207 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1208 s->last_mv[i][0][1] >> 1);
1209 dmy = get_dmv(s);
1210 s->mv_type = MV_TYPE_DMV;
1211
1212
1213 s->last_mv[i][0][1] = my<<1;
1214 s->last_mv[i][1][1] = my<<1;
1215
1216 s->mv[i][0][0] = mx;
1217 s->mv[i][0][1] = my;
1218 s->mv[i][1][0] = mx;//not used
1219 s->mv[i][1][1] = my;//not used
1220
1221 if (s->picture_structure == PICT_FRAME) {
1222 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1223
1224 //m = 1 + 2 * s->top_field_first;
1225 m = s->top_field_first ? 1 : 3;
1226
1227 /* top -> top pred */
1228 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1229 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1230 m = 4 - m;
1231 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1232 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1233 } else {
1234 mb_type |= MB_TYPE_16x16;
1235
1236 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1237 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1238 if(s->picture_structure == PICT_TOP_FIELD)
1239 s->mv[i][2][1]--;
1240 else
1241 s->mv[i][2][1]++;
1242 }
1243 }
1244 break;
1245 }
1246 }
1247 }
1248 }
1249
1250 s->mb_intra = 0;
1251
1252 if (IS_PAT(mb_type)) {
1253 cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1254 if (cbp < 0){
1255 fprintf(stderr, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1256 return -1;
1257 }
1258 cbp++;
1259
1260 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1261 for(i=0;i<6;i++) {
1262 if (cbp & 32) {
1263 if (mpeg2_decode_block_non_intra(s, block[i], i) < 0)
1264 return -1;
1265 } else {
1266 s->block_last_index[i] = -1;
1267 }
1268 cbp+=cbp;
1269 }
1270 } else {
1271 for(i=0;i<6;i++) {
1272 if (cbp & 32) {
1273 if (mpeg1_decode_block_inter(s, block[i], i) < 0)
1274 return -1;
1275 } else {
1276 s->block_last_index[i] = -1;
1277 }
1278 cbp+=cbp;
1279 }
1280 }
1281 }else{
1282 for(i=0;i<6;i++)
1283 s->block_last_index[i] = -1;
1284 }
1285 }
1286
1287 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1288
1289 return 0;
1290 }
1291
1292 /* as h263, but only 17 codes */
1293 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1294 {
1295 int code, sign, val, l, shift;
1296
1297 code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1298 if (code == 0) {
1299 return pred;
1300 }
1301 if (code < 0) {
1302 return 0xffff;
1303 }
1304
1305 sign = get_bits1(&s->gb);
1306 shift = fcode - 1;
1307 val = code;
1308 if (shift) {
1309 val = (val - 1) << shift;
1310 val |= get_bits(&s->gb, shift);
1311 val++;
1312 }
1313 if (sign)
1314 val = -val;
1315 val += pred;
1316
1317 /* modulo decoding */
1318 l = 1 << (shift+4);
1319 val = ((val + l)&(l*2-1)) - l;
1320 return val;
1321 }
1322
1323 static inline int decode_dc(GetBitContext *gb, int component)
1324 {
1325 int code, diff;
1326
1327 if (component == 0) {
1328 code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1329 } else {
1330 code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1331 }
1332 if (code < 0){
1333 fprintf(stderr, "invalid dc code at\n");
1334 return 0xffff;
1335 }
1336 if (code == 0) {
1337 diff = 0;
1338 } else {
1339 diff = get_xbits(gb, code);
1340 }
1341 return diff;
1342 }
1343
1344 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
1345 DCTELEM *block,
1346 int n)
1347 {
1348 int level, dc, diff, i, j, run;
1349 int component;
1350 RLTable *rl = &rl_mpeg1;
1351 uint8_t * const scantable= s->intra_scantable.permutated;
1352 const uint16_t *quant_matrix= s->intra_matrix;
1353 const int qscale= s->qscale;
1354
1355 /* DC coef */
1356 component = (n <= 3 ? 0 : n - 4 + 1);
1357 diff = decode_dc(&s->gb, component);
1358 if (diff >= 0xffff)
1359 return -1;
1360 dc = s->last_dc[component];
1361 dc += diff;
1362 s->last_dc[component] = dc;
1363 block[0] = dc<<3;
1364 dprintf("dc=%d diff=%d\n", dc, diff);
1365 i = 0;
1366 {
1367 OPEN_READER(re, &s->gb);
1368 /* now quantify & encode AC coefs */
1369 for(;;) {
1370 UPDATE_CACHE(re, &s->gb);
1371 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1372
1373 if(level == 127){
1374 break;
1375 } else if(level != 0) {
1376 i += run;
1377 j = scantable[i];
1378 level= (level*qscale*quant_matrix[j])>>3;
1379 level= (level-1)|1;
1380 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1381 LAST_SKIP_BITS(re, &s->gb, 1);
1382 } else {
1383 /* escape */
1384 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1385 UPDATE_CACHE(re, &s->gb);
1386 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1387 if (level == -128) {
1388 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1389 } else if (level == 0) {
1390 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
1391 }
1392 i += run;
1393 j = scantable[i];
1394 if(level<0){
1395 level= -level;
1396 level= (level*qscale*quant_matrix[j])>>3;
1397 level= (level-1)|1;
1398 level= -level;
1399 }else{
1400 level= (level*qscale*quant_matrix[j])>>3;
1401 level= (level-1)|1;
1402 }
1403 }
1404 if (i > 63){
1405 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1406 return -1;
1407 }
1408
1409 block[j] = level;
1410 }
1411 CLOSE_READER(re, &s->gb);
1412 }
1413 s->block_last_index[n] = i;
1414 return 0;
1415 }
1416
1417 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
1418 DCTELEM *block,
1419 int n)
1420 {
1421 int level, i, j, run;
1422 RLTable *rl = &rl_mpeg1;
1423 uint8_t * const scantable= s->intra_scantable.permutated;
1424 const uint16_t *quant_matrix= s->inter_matrix;
1425 const int qscale= s->qscale;
1426
1427 {
1428 int v;
1429 OPEN_READER(re, &s->gb);
1430 i = -1;
1431 /* special case for the first coef. no need to add a second vlc table */
1432 UPDATE_CACHE(re, &s->gb);
1433 v= SHOW_UBITS(re, &s->gb, 2);
1434 if (v & 2) {
1435 LAST_SKIP_BITS(re, &s->gb, 2);
1436 level= (3*qscale*quant_matrix[0])>>4;
1437 level= (level-1)|1;
1438 if(v&1)
1439 level= -level;
1440 block[0] = level;
1441 i++;
1442 }
1443
1444 /* now quantify & encode AC coefs */
1445 for(;;) {
1446 UPDATE_CACHE(re, &s->gb);
1447 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1448
1449 if(level == 127){
1450 break;
1451 } else if(level != 0) {
1452 i += run;
1453 j = scantable[i];
1454 level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1455 level= (level-1)|1;
1456 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1457 LAST_SKIP_BITS(re, &s->gb, 1);
1458 } else {
1459 /* escape */
1460 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1461 UPDATE_CACHE(re, &s->gb);
1462 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1463 if (level == -128) {
1464 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1465 } else if (level == 0) {
1466 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
1467 }
1468 i += run;
1469 j = scantable[i];
1470 if(level<0){
1471 level= -level;
1472 level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1473 level= (level-1)|1;
1474 level= -level;
1475 }else{
1476 level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1477 level= (level-1)|1;
1478 }
1479 }
1480 if (i > 63){
1481 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1482 return -1;
1483 }
1484
1485 block[j] = level;
1486 }
1487 CLOSE_READER(re, &s->gb);
1488 }
1489 s->block_last_index[n] = i;
1490 return 0;
1491 }
1492
1493 /* Also does unquantization here, since I will never support mpeg2
1494 encoding */
1495 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
1496 DCTELEM *block,
1497 int n)
1498 {
1499 int level, i, j, run;
1500 RLTable *rl = &rl_mpeg1;
1501 uint8_t * const scantable= s->intra_scantable.permutated;
1502 const uint16_t *quant_matrix;
1503 const int qscale= s->qscale;
1504 int mismatch;
1505
1506 mismatch = 1;
1507
1508 {
1509 int v;
1510 OPEN_READER(re, &s->gb);
1511 i = -1;
1512 if (n < 4)
1513 quant_matrix = s->inter_matrix;
1514 else
1515 quant_matrix = s->chroma_inter_matrix;
1516
1517 /* special case for the first coef. no need to add a second vlc table */
1518 UPDATE_CACHE(re, &s->gb);
1519 v= SHOW_UBITS(re, &s->gb, 2);
1520 if (v & 2) {
1521 LAST_SKIP_BITS(re, &s->gb, 2);
1522 level= (3*qscale*quant_matrix[0])>>5;
1523 if(v&1)
1524 level= -level;
1525 block[0] = level;
1526 mismatch ^= level;
1527 i++;
1528 }
1529
1530 /* now quantify & encode AC coefs */
1531 for(;;) {
1532 UPDATE_CACHE(re, &s->gb);
1533 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1534
1535 if(level == 127){
1536 break;
1537 } else if(level != 0) {
1538 i += run;
1539 j = scantable[i];
1540 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1541 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1542 LAST_SKIP_BITS(re, &s->gb, 1);
1543 } else {
1544 /* escape */
1545 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1546 UPDATE_CACHE(re, &s->gb);
1547 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1548
1549 i += run;
1550 j = scantable[i];
1551 if(level<0){
1552 level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1553 level= -level;
1554 }else{
1555 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1556 }
1557 }
1558 if (i > 63){
1559 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1560 return -1;
1561 }
1562
1563 mismatch ^= level;
1564 block[j] = level;
1565 }
1566 CLOSE_READER(re, &s->gb);
1567 }
1568 block[63] ^= (mismatch & 1);
1569
1570 s->block_last_index[n] = i;
1571 return 0;
1572 }
1573
1574 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1575 DCTELEM *block,
1576 int n)
1577 {
1578 int level, dc, diff, i, j, run;
1579 int component;
1580 RLTable *rl;
1581 uint8_t * const scantable= s->intra_scantable.permutated;
1582 const uint16_t *quant_matrix;
1583 const int qscale= s->qscale;
1584 int mismatch;
1585
1586 /* DC coef */
1587 if (n < 4){
1588 quant_matrix = s->intra_matrix;
1589 component = 0;
1590 }else{
1591 quant_matrix = s->chroma_intra_matrix;
1592 component = n - 3;
1593 }
1594 diff = decode_dc(&s->gb, component);
1595 if (diff >= 0xffff)
1596 return -1;
1597 dc = s->last_dc[component];
1598 dc += diff;
1599 s->last_dc[component] = dc;
1600 block[0] = dc << (3 - s->intra_dc_precision);
1601 dprintf("dc=%d\n", block[0]);
1602 mismatch = block[0] ^ 1;
1603 i = 0;
1604 if (s->intra_vlc_format)
1605 rl = &rl_mpeg2;
1606 else
1607 rl = &rl_mpeg1;
1608
1609 {
1610 OPEN_READER(re, &s->gb);
1611 /* now quantify & encode AC coefs */
1612 for(;;) {
1613 UPDATE_CACHE(re, &s->gb);
1614 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1615
1616 if(level == 127){
1617 break;
1618 } else if(level != 0) {
1619 i += run;
1620 j = scantable[i];
1621 level= (level*qscale*quant_matrix[j])>>4;
1622 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1623 LAST_SKIP_BITS(re, &s->gb, 1);
1624 } else {
1625 /* escape */
1626 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1627 UPDATE_CACHE(re, &s->gb);
1628 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1629 i += run;
1630 j = scantable[i];
1631 if(level<0){
1632 level= (-level*qscale*quant_matrix[j])>>4;
1633 level= -level;
1634 }else{
1635 level= (level*qscale*quant_matrix[j])>>4;
1636 }
1637 }
1638 if (i > 63){
1639 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1640 return -1;
1641 }
1642
1643 mismatch^= level;
1644 block[j] = level;
1645 }
1646 CLOSE_READER(re, &s->gb);
1647 }
1648 block[63]^= mismatch&1;
1649
1650 s->block_last_index[n] = i;
1651 return 0;
1652 }
1653
1654 typedef struct Mpeg1Context {
1655 MpegEncContext mpeg_enc_ctx;
1656 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1657 int repeat_field; /* true if we must repeat the field */
1658 AVPanScan pan_scan; /** some temporary storage for the panscan */
1659 } Mpeg1Context;
1660
1661 static int mpeg_decode_init(AVCodecContext *avctx)
1662 {
1663 Mpeg1Context *s = avctx->priv_data;
1664
1665 s->mpeg_enc_ctx.flags= avctx->flags;
1666 common_init(&s->mpeg_enc_ctx);
1667 init_vlcs();
1668
1669 s->mpeg_enc_ctx_allocated = 0;
1670 s->mpeg_enc_ctx.picture_number = 0;
1671 s->repeat_field = 0;
1672 s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1673 return 0;
1674 }
1675
1676 /* return the 8 bit start code value and update the search
1677 state. Return -1 if no start code found */
1678 static int find_start_code(uint8_t **pbuf_ptr, uint8_t *buf_end)
1679 {
1680 uint8_t *buf_ptr;
1681 unsigned int state=0xFFFFFFFF, v;
1682 int val;
1683
1684 buf_ptr = *pbuf_ptr;
1685 while (buf_ptr < buf_end) {
1686 v = *buf_ptr++;
1687 if (state == 0x000001) {
1688 state = ((state << 8) | v) & 0xffffff;
1689 val = state;
1690 goto found;
1691 }
1692 state = ((state << 8) | v) & 0xffffff;
1693 }
1694 val = -1;
1695 found:
1696 *pbuf_ptr = buf_ptr;
1697 return val;
1698 }
1699
1700 static int mpeg1_decode_picture(AVCodecContext *avctx,
1701 uint8_t *buf, int buf_size)
1702 {
1703 Mpeg1Context *s1 = avctx->priv_data;
1704 MpegEncContext *s = &s1->mpeg_enc_ctx;
1705 int ref, f_code;
1706
1707 init_get_bits(&s->gb, buf, buf_size*8);
1708
1709 ref = get_bits(&s->gb, 10); /* temporal ref */
1710 s->pict_type = get_bits(&s->gb, 3);
1711 dprintf("pict_type=%d number=%d\n", s->pict_type, s->picture_number);
1712
1713 skip_bits(&s->gb, 16);
1714 if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1715 s->full_pel[0] = get_bits1(&s->gb);
1716 f_code = get_bits(&s->gb, 3);
1717 if (f_code == 0)
1718 return -1;
1719 s->mpeg_f_code[0][0] = f_code;
1720 s->mpeg_f_code[0][1] = f_code;
1721 }
1722 if (s->pict_type == B_TYPE) {
1723 s->full_pel[1] = get_bits1(&s->gb);
1724 f_code = get_bits(&s->gb, 3);
1725 if (f_code == 0)
1726 return -1;
1727 s->mpeg_f_code[1][0] = f_code;
1728 s->mpeg_f_code[1][1] = f_code;
1729 }
1730 s->current_picture.pict_type= s->pict_type;
1731 s->current_picture.key_frame= s->pict_type == I_TYPE;
1732
1733 s->y_dc_scale = 8;
1734 s->c_dc_scale = 8;
1735 s->first_slice = 1;
1736 return 0;
1737 }
1738
1739 static void mpeg_decode_sequence_extension(MpegEncContext *s)
1740 {
1741 int horiz_size_ext, vert_size_ext;
1742 int bit_rate_ext, vbv_buf_ext;
1743 int frame_rate_ext_n, frame_rate_ext_d;
1744 int level, profile;
1745 float aspect;
1746
1747 skip_bits(&s->gb, 1); /* profil and level esc*/
1748 profile= get_bits(&s->gb, 3);
1749 level= get_bits(&s->gb, 4);
1750 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1751 skip_bits(&s->gb, 2); /* chroma_format */
1752 horiz_size_ext = get_bits(&s->gb, 2);
1753 vert_size_ext = get_bits(&s->gb, 2);
1754 s->width |= (horiz_size_ext << 12);
1755 s->height |= (vert_size_ext << 12);
1756 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1757 s->bit_rate = ((s->bit_rate / 400) | (bit_rate_ext << 12)) * 400;
1758 skip_bits1(&s->gb); /* marker */
1759 vbv_buf_ext = get_bits(&s->gb, 8);
1760
1761 s->low_delay = get_bits1(&s->gb);
1762 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1763
1764 frame_rate_ext_n = get_bits(&s->gb, 2);
1765 frame_rate_ext_d = get_bits(&s->gb, 5);
1766 av_reduce(
1767 &s->avctx->frame_rate,
1768 &s->avctx->frame_rate_base,
1769 frame_rate_tab[s->frame_rate_index] * (frame_rate_ext_n+1),
1770 MPEG1_FRAME_RATE_BASE * (frame_rate_ext_d+1),
1771 1<<30);
1772
1773 dprintf("sequence extension\n");
1774 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1775 s->avctx->sub_id = 2; /* indicates mpeg2 found */
1776
1777 aspect= mpeg2_aspect[s->aspect_ratio_info];
1778 if(aspect>0.0) s->avctx->aspect_ratio= s->width/(aspect*s->height);
1779 else if(aspect<0.0) s->avctx->aspect_ratio= -1.0/aspect;
1780
1781 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1782 printf("profile: %d, level: %d \n", profile, level);
1783 }
1784
1785 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1786 {
1787 MpegEncContext *s= &s1->mpeg_enc_ctx;
1788 int color_description, w, h;
1789
1790 skip_bits(&s->gb, 3); /* video format */
1791 color_description= get_bits1(&s->gb);
1792 if(color_description){
1793 skip_bits(&s->gb, 8); /* color primaries */
1794 skip_bits(&s->gb, 8); /* transfer_characteristics */
1795 skip_bits(&s->gb, 8); /* matrix_coefficients */
1796 }
1797 w= get_bits(&s->gb, 14);
1798 skip_bits(&s->gb, 1); //marker
1799 h= get_bits(&s->gb, 14);
1800 skip_bits(&s->gb, 1); //marker
1801
1802 s1->pan_scan.width= 16*w;
1803 s1->pan_scan.height=16*h;
1804
1805 if(mpeg2_aspect[s->aspect_ratio_info] < 0.0)
1806 s->avctx->aspect_ratio*= (s->width * h)/(float)(s->height * w);
1807
1808 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1809 printf("sde w:%d, h:%d\n", w, h);
1810 }
1811
1812 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1813 {
1814 MpegEncContext *s= &s1->mpeg_enc_ctx;
1815 int i;
1816
1817 for(i=0; i<1; i++){ //FIXME count
1818 s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1819 skip_bits(&s->gb, 1); //marker
1820 s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1821 skip_bits(&s->gb, 1); //marker
1822 }
1823
1824 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1825 printf("pde (%d,%d) (%d,%d) (%d,%d)\n",
1826 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1827 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1828 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1829 );
1830 }
1831
1832 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1833 {
1834 int i, v, j;
1835
1836 dprintf("matrix extension\n");
1837
1838 if (get_bits1(&s->gb)) {
1839 for(i=0;i<64;i++) {
1840 v = get_bits(&s->gb, 8);
1841 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1842 s->intra_matrix[j] = v;
1843 s->chroma_intra_matrix[j] = v;
1844 }
1845 }
1846 if (get_bits1(&s->gb)) {
1847 for(i=0;i<64;i++) {
1848 v = get_bits(&s->gb, 8);
1849 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1850 s->inter_matrix[j] = v;
1851 s->chroma_inter_matrix[j] = v;
1852 }
1853 }
1854 if (get_bits1(&s->gb)) {
1855 for(i=0;i<64;i++) {
1856 v = get_bits(&s->gb, 8);
1857 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1858 s->chroma_intra_matrix[j] = v;
1859 }
1860 }
1861 if (get_bits1(&s->gb)) {
1862 for(i=0;i<64;i++) {
1863 v = get_bits(&s->gb, 8);
1864 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1865 s->chroma_inter_matrix[j] = v;
1866 }
1867 }
1868 }
1869
1870 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1871 {
1872 s->full_pel[0] = s->full_pel[1] = 0;
1873 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1874 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1875 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1876 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1877 s->intra_dc_precision = get_bits(&s->gb, 2);
1878 s->picture_structure = get_bits(&s->gb, 2);
1879 s->top_field_first = get_bits1(&s->gb);
1880 s->frame_pred_frame_dct = get_bits1(&s->gb);
1881 s->concealment_motion_vectors = get_bits1(&s->gb);
1882 s->q_scale_type = get_bits1(&s->gb);
1883 s->intra_vlc_format = get_bits1(&s->gb);
1884 s->alternate_scan = get_bits1(&s->gb);
1885 s->repeat_first_field = get_bits1(&s->gb);
1886 s->chroma_420_type = get_bits1(&s->gb);
1887 s->progressive_frame = get_bits1(&s->gb);
1888
1889 if(s->picture_structure == PICT_FRAME)
1890 s->first_field=0;
1891 else{
1892 s->first_field ^= 1;
1893 memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1894 }
1895
1896 if(s->alternate_scan){
1897 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
1898 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
1899 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
1900 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
1901 }else{
1902 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
1903 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
1904 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
1905 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
1906 }
1907
1908 /* composite display not parsed */
1909 dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
1910 dprintf("picture_structure=%d\n", s->picture_structure);
1911 dprintf("top field first=%d\n", s->top_field_first);
1912 dprintf("repeat first field=%d\n", s->repeat_first_field);
1913 dprintf("conceal=%d\n", s->concealment_motion_vectors);
1914 dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
1915 dprintf("alternate_scan=%d\n", s->alternate_scan);
1916 dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1917 dprintf("progressive_frame=%d\n", s->progressive_frame);
1918 }
1919
1920 static void mpeg_decode_extension(AVCodecContext *avctx,
1921 uint8_t *buf, int buf_size)
1922 {
1923 Mpeg1Context *s1 = avctx->priv_data;
1924 MpegEncContext *s = &s1->mpeg_enc_ctx;
1925 int ext_type;
1926
1927 init_get_bits(&s->gb, buf, buf_size*8);
1928
1929 ext_type = get_bits(&s->gb, 4);
1930 switch(ext_type) {
1931 case 0x1:
1932 mpeg_decode_sequence_extension(s);
1933 break;
1934 case 0x2:
1935 mpeg_decode_sequence_display_extension(s1);
1936 break;
1937 case 0x3:
1938 mpeg_decode_quant_matrix_extension(s);
1939 break;
1940 case 0x7:
1941 mpeg_decode_picture_display_extension(s1);
1942 break;
1943 case 0x8:
1944 mpeg_decode_picture_coding_extension(s);
1945 break;
1946 }
1947 }
1948
1949 static void exchange_uv(AVFrame *f){
1950 uint8_t *t= f->data[1];
1951 f->data[1]= f->data[2];
1952 f->data[2]= t;
1953 }
1954
1955 #define DECODE_SLICE_FATAL_ERROR -2
1956 #define DECODE_SLICE_ERROR -1
1957 #define DECODE_SLICE_OK 0
1958
1959 /**
1960 * decodes a slice.
1961 * @return DECODE_SLICE_FATAL_ERROR if a non recoverable error occured<br>
1962 * DECODE_SLICE_ERROR if the slice is damaged<br>
1963 * DECODE_SLICE_OK if this slice is ok<br>
1964 */
1965 static int mpeg_decode_slice(AVCodecContext *avctx,
1966 AVFrame *pict,
1967 int start_code,
1968 uint8_t **buf, int buf_size)
1969 {
1970 Mpeg1Context *s1 = avctx->priv_data;
1971 MpegEncContext *s = &s1->mpeg_enc_ctx;
1972 int ret;
1973 const int field_pic= s->picture_structure != PICT_FRAME;
1974
1975 s->resync_mb_x= s->mb_x =
1976 s->resync_mb_y= s->mb_y = -1;
1977
1978 start_code = (start_code - 1) & 0xff;
1979 if (start_code >= s->mb_height){
1980 fprintf(stderr, "slice below image (%d >= %d)\n", start_code, s->mb_height);
1981 return -1;
1982 }
1983
1984 ff_mpeg1_clean_buffers(s);
1985 s->interlaced_dct = 0;
1986
1987 /* start frame decoding */
1988 if (s->first_slice) {
1989 if(s->first_field || s->picture_structure==PICT_FRAME){
1990 if(MPV_frame_start(s, avctx) < 0)
1991 return DECODE_SLICE_FATAL_ERROR;
1992
1993 ff_er_frame_start(s);
1994
1995 /* first check if we must repeat the frame */
1996 s->current_picture_ptr->repeat_pict = 0;
1997 if (s->repeat_first_field) {
1998 if (s->progressive_sequence) {
1999 if (s->top_field_first)
2000 s->current_picture_ptr->repeat_pict = 4;
2001 else
2002 s->current_picture_ptr->repeat_pict = 2;
2003 } else if (s->progressive_frame) {
2004 s->current_picture_ptr->repeat_pict = 1;
2005 }
2006 }
2007
2008 *s->current_picture_ptr->pan_scan= s1->pan_scan;
2009
2010 //printf("%d\n", s->current_picture_ptr->repeat_pict);
2011
2012 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2013 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",
2014 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],
2015 s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
2016 s->progressive_sequence ? "pro" :"", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
2017 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2018 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2019 }
2020 }else{ //second field
2021 int i;
2022
2023 if(!s->current_picture_ptr){
2024 fprintf(stderr, "first field missing\n");
2025 return -1;
2026 }
2027
2028 for(i=0; i<4; i++){
2029 s->current_picture.data[i] = s->current_picture_ptr->data[i];
2030 if(s->picture_structure == PICT_BOTTOM_FIELD){
2031 s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2032 }
2033 }
2034 }
2035 #ifdef HAVE_XVMC
2036 // MPV_frame_start will call this function too,
2037 // but we need to call it on every field
2038 if(s->avctx->xvmc_acceleration)
2039 XVMC_field_start(s,avctx);
2040 #endif
2041 }//fi(s->first_slice)
2042 s->first_slice = 0;
2043
2044 init_get_bits(&s->gb, *buf, buf_size*8);
2045
2046 s->qscale = get_qscale(s);
2047 if(s->qscale == 0){
2048 fprintf(stderr, "qscale == 0\n");
2049 return -1;
2050 }
2051
2052 /* extra slice info */
2053 while (get_bits1(&s->gb) != 0) {
2054 skip_bits(&s->gb, 8);
2055 }
2056
2057 s->mb_x=0;
2058
2059 for(;;) {
2060 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2061 if (code < 0){
2062 fprintf(stderr, "first mb_incr damaged\n");
2063 return -1;
2064 }
2065 if (code >= 33) {
2066 if (code == 33) {
2067 s->mb_x += 33;
2068 }
2069 /* otherwise, stuffing, nothing to do */
2070 } else {
2071 s->mb_x += code;
2072 break;
2073 }
2074 }
2075
2076 s->resync_mb_x= s->mb_x;
2077 s->resync_mb_y= s->mb_y = start_code;
2078 s->mb_skip_run= 0;
2079 ff_init_block_index(s);
2080
2081 for(;;) {
2082 s->dsp.clear_blocks(s->block[0]);
2083
2084 ret = mpeg_decode_mb(s, s->block);
2085
2086 dprintf("ret=%d\n", ret);
2087 if (ret < 0)
2088 return -1;
2089
2090 if(s->motion_val && s->pict_type != B_TYPE){ //note motion_val is normally NULL unless we want to extract the MVs
2091 const int wrap = s->block_wrap[0];
2092 const int xy = s->mb_x*2 + 1 + (s->mb_y*2 +1)*wrap;
2093 int motion_x, motion_y;
2094
2095 if (s->mb_intra) {
2096 motion_x = motion_y = 0;
2097 }else if (s->mv_type == MV_TYPE_16X16) {
2098 motion_x = s->mv[0][0][0];
2099 motion_y = s->mv[0][0][1];
2100 } else /*if (s->mv_type == MV_TYPE_FIELD)*/ {
2101 motion_x = s->mv[0][0][0] + s->mv[0][1][0];
2102 motion_y = s->mv[0][0][1] + s->mv[0][1][1];
2103 motion_x = (motion_x>>1) | (motion_x&1);
2104 }
2105 s->motion_val[xy][0] = motion_x;
2106 s->motion_val[xy][1] = motion_y;
2107 s->motion_val[xy + 1][0] = motion_x;
2108 s->motion_val[xy + 1][1] = motion_y;
2109 s->motion_val[xy + wrap][0] = motion_x;
2110 s->motion_val[xy + wrap][1] = motion_y;
2111 s->motion_val[xy + 1 + wrap][0] = motion_x;
2112 s->motion_val[xy + 1 + wrap][1] = motion_y;
2113 }
2114
2115 s->dest[0] += 16;
2116 s->dest[1] += 8;
2117 s->dest[2] += 8;
2118
2119 MPV_decode_mb(s, s->block);
2120
2121 if (++s->mb_x >= s->mb_width) {
2122 if(s->avctx->codec_tag == ff_get_fourcc("VCR2"))
2123 exchange_uv((AVFrame*)s->current_picture_ptr);
2124
2125 ff_draw_horiz_band(s, 16*s->mb_y, 16);
2126
2127 if(s->avctx->codec_tag == ff_get_fourcc("VCR2"))
2128 exchange_uv((AVFrame*)s->current_picture_ptr);
2129
2130 s->mb_x = 0;
2131 s->mb_y++;
2132
2133 if(s->mb_y<<field_pic >= s->mb_height){
2134 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2135
2136 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)))
2137 || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2138 fprintf(stderr, "end missmatch left=%d\n", left);
2139 return -1;
2140 }else
2141 goto eos;
2142 }
2143
2144 ff_init_block_index(s);
2145 }
2146
2147 /* skip mb handling */
2148 if (s->mb_skip_run == -1) {
2149 /* read again increment */
2150 s->mb_skip_run = 0;
2151 for(;;) {
2152 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2153 if (code < 0){
2154 fprintf(stderr, "mb incr damaged\n");
2155 return -1;
2156 }
2157 if (code >= 33) {
2158 if (code == 33) {
2159 s->mb_skip_run += 33;
2160 }else if(code == 35){
2161 if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2162 fprintf(stderr, "slice missmatch\n");
2163 return -1;
2164 }
2165 goto eos; /* end of slice */
2166 }
2167 /* otherwise, stuffing, nothing to do */
2168 } else {
2169 s->mb_skip_run += code;
2170 break;
2171 }
2172 }
2173 }
2174 }
2175 eos: // end of slice
2176 *buf += get_bits_count(&s->gb)/8 - 1;
2177 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2178 return 0;
2179 }
2180
2181 /**
2182 * handles slice ends.
2183 * @return 1 if it seems to be the last slice of
2184 */
2185 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2186 {
2187 Mpeg1Context *s1 = avctx->priv_data;
2188 MpegEncContext *s = &s1->mpeg_enc_ctx;
2189
2190 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2191 return 0;
2192
2193 #ifdef HAVE_XVMC
2194 if(s->avctx->xvmc_acceleration)
2195 XVMC_field_end(s);
2196 #endif
2197 /* end of slice reached */
2198 if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2199 /* end of image */
2200
2201 if(s->codec_id == CODEC_ID_MPEG2VIDEO){
2202 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2203 }else
2204 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG1;
2205
2206 ff_er_frame_end(s);
2207
2208 MPV_frame_end(s);
2209
2210 if (s->pict_type == B_TYPE || s->low_delay) {
2211 *pict= *(AVFrame*)s->current_picture_ptr;
2212 ff_print_debug_info(s, s->current_picture_ptr);
2213 } else {
2214 s->picture_number++;
2215 /* latency of 1 frame for I and P frames */
2216 /* XXX: use another variable than picture_number */
2217 if (s->last_picture_ptr != NULL) {
2218 *pict= *(AVFrame*)s->last_picture_ptr;
2219 ff_print_debug_info(s, s->last_picture_ptr);
2220 }
2221 }
2222 if(s->avctx->codec_tag == ff_get_fourcc("VCR2"))
2223 exchange_uv(pict);
2224
2225 return 1;
2226 } else {
2227 return 0;
2228 }
2229 }
2230
2231 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2232 uint8_t *buf, int buf_size)
2233 {
2234 Mpeg1Context *s1 = avctx->priv_data;
2235 MpegEncContext *s = &s1->mpeg_enc_ctx;
2236 int width, height, i, v, j;
2237 float aspect;
2238
2239 init_get_bits(&s->gb, buf, buf_size*8);
2240
2241 width = get_bits(&s->gb, 12);
2242 height = get_bits(&s->gb, 12);
2243 s->aspect_ratio_info= get_bits(&s->gb, 4);
2244 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
2245 aspect= mpeg1_aspect[s->aspect_ratio_info];
2246 if(aspect!=0.0) avctx->aspect_ratio= width/(aspect*height);
2247 }
2248
2249 s->frame_rate_index = get_bits(&s->gb, 4);
2250 if (s->frame_rate_index == 0)
2251 return -1;
2252 s->bit_rate = get_bits(&s->gb, 18) * 400;
2253 if (get_bits1(&s->gb) == 0) /* marker */
2254 return -1;
2255 if (width <= 0 || height <= 0 ||
2256 (width % 2) != 0 || (height % 2) != 0)
2257 return -1;
2258 if (width != s->width ||
2259 height != s->height) {
2260 /* start new mpeg1 context decoding */
2261 s->out_format = FMT_MPEG1;
2262 if (s1->mpeg_enc_ctx_allocated) {
2263 MPV_common_end(s);
2264 }
2265 s->width = width;
2266 s->height = height;
2267 avctx->has_b_frames= 1;
2268 s->avctx = avctx;
2269 avctx->width = width;
2270 avctx->height = height;
2271 av_reduce(
2272 &avctx->frame_rate,
2273 &avctx->frame_rate_base,
2274 frame_rate_tab[s->frame_rate_index],
2275 MPEG1_FRAME_RATE_BASE, //FIXME store in allready reduced form
2276 1<<30
2277 );
2278 avctx->bit_rate = s->bit_rate;
2279
2280 //get_format() or set_video(width,height,aspect,pix_fmt);
2281 //until then pix_fmt may be changed right after codec init
2282 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2283 avctx->idct_algo = FF_IDCT_SIMPLE;
2284
2285 if (MPV_common_init(s) < 0)
2286 return -1;
2287 s1->mpeg_enc_ctx_allocated = 1;
2288 }
2289
2290 skip_bits(&s->gb, 10); /* vbv_buffer_size */
2291 skip_bits(&s->gb, 1);
2292
2293 /* get matrix */
2294 if (get_bits1(&s->gb)) {
2295 for(i=0;i<64;i++) {
2296 v = get_bits(&s->gb, 8);
2297 j = s->intra_scantable.permutated[i];
2298 s->intra_matrix[j] = v;
2299 s->chroma_intra_matrix[j] = v;
2300 }
2301 #ifdef DEBUG
2302 dprintf("intra matrix present\n");
2303 for(i=0;i<64;i++)
2304 dprintf(" %d", s->intra_matrix[s->intra_scantable.permutated[i]]);
2305 printf("\n");
2306 #endif
2307 } else {
2308 for(i=0;i<64;i++) {
2309 int j= s->dsp.idct_permutation[i];
2310 v = ff_mpeg1_default_intra_matrix[i];
2311 s->intra_matrix[j] = v;
2312 s->chroma_intra_matrix[j] = v;
2313 }
2314 }
2315 if (get_bits1(&s->gb)) {
2316 for(i=0;i<64;i++) {
2317 v = get_bits(&s->gb, 8);
2318 j = s->intra_scantable.permutated[i];
2319 s->inter_matrix[j] = v;
2320 s->chroma_inter_matrix[j] = v;
2321 }
2322 #ifdef DEBUG
2323 dprintf("non intra matrix present\n");
2324 for(i=0;i<64;i++)
2325 dprintf(" %d", s->inter_matrix[s->intra_scantable.permutated[i]]);
2326 printf("\n");
2327 #endif
2328 } else {
2329 for(i=0;i<64;i++) {
2330 int j= s->dsp.idct_permutation[i];
2331 v = ff_mpeg1_default_non_intra_matrix[i];
2332 s->inter_matrix[j] = v;
2333 s->chroma_inter_matrix[j] = v;
2334 }
2335 }
2336
2337 /* we set mpeg2 parameters so that it emulates mpeg1 */
2338 s->progressive_sequence = 1;
2339 s->progressive_frame = 1;
2340 s->picture_structure = PICT_FRAME;
2341 s->frame_pred_frame_dct = 1;
2342 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2343 avctx->sub_id = 1; /* indicates mpeg1 */
2344 return 0;
2345 }
2346
2347 static int vcr2_init_sequence(AVCodecContext *avctx)
2348 {
2349 Mpeg1Context *s1 = avctx->priv_data;
2350 MpegEncContext *s = &s1->mpeg_enc_ctx;
2351 int i, v;
2352
2353 /* start new mpeg1 context decoding */
2354 s->out_format = FMT_MPEG1;
2355 if (s1->mpeg_enc_ctx_allocated) {
2356 MPV_common_end(s);
2357 }
2358 s->width = avctx->width;
2359 s->height = avctx->height;
2360 avctx->has_b_frames= 0; //true?
2361 s->low_delay= 1;
2362 s->avctx = avctx;
2363
2364 //get_format() or set_video(width,height,aspect,pix_fmt);
2365 //until then pix_fmt may be changed right after codec init
2366 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2367 avctx->idct_algo = FF_IDCT_SIMPLE;
2368
2369 if (MPV_common_init(s) < 0)
2370 return -1;
2371 s1->mpeg_enc_ctx_allocated = 1;
2372
2373 for(i=0;i<64;i++) {
2374 int j= s->dsp.idct_permutation[i];
2375 v = ff_mpeg1_default_intra_matrix[i];
2376 s->intra_matrix[j] = v;
2377 s->chroma_intra_matrix[j] = v;
2378
2379 v = ff_mpeg1_default_non_intra_matrix[i];
2380 s->inter_matrix[j] = v;
2381 s->chroma_inter_matrix[j] = v;
2382 }
2383
2384 s->progressive_sequence = 1;
2385 s->progressive_frame = 1;
2386 s->picture_structure = PICT_FRAME;
2387 s->frame_pred_frame_dct = 1;
2388 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2389 avctx->sub_id = 2; /* indicates mpeg2 */
2390 return 0;
2391 }
2392
2393
2394 static void mpeg_decode_user_data(AVCodecContext *avctx,
2395 const uint8_t *buf, int buf_size)
2396 {
2397 const uint8_t *p;
2398 int len, flags;
2399 p = buf;
2400 len = buf_size;
2401
2402 /* we parse the DTG active format information */
2403 if (len >= 5 &&
2404 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2405 flags = p[4];
2406 p += 5;
2407 len -= 5;
2408 if (flags & 0x80) {
2409 /* skip event id */
2410 if (len < 2)
2411 return;
2412 p += 2;
2413 len -= 2;
2414 }
2415 if (flags & 0x40) {
2416 if (len < 1)
2417 return;
2418 avctx->dtg_active_format = p[0] & 0x0f;
2419 }
2420 }
2421 }
2422
2423 /**
2424 * finds the end of the current frame in the bitstream.
2425 * @return the position of the first byte of the next frame, or -1
2426 */
2427 static int mpeg1_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
2428 ParseContext *pc= &s->parse_context;
2429 int i;
2430 uint32_t state;
2431
2432 state= pc->state;
2433
2434 i=0;
2435 if(!pc->frame_start_found){
2436 for(i=0; i<buf_size; i++){
2437 state= (state<<8) | buf[i];
2438 if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2439 i++;
2440 pc->frame_start_found=1;
2441 break;
2442 }
2443 }
2444 }
2445
2446 if(pc->frame_start_found){
2447 for(; i<buf_size; i++){
2448 state= (state<<8) | buf[i];
2449 if((state&0xFFFFFF00) == 0x100){
2450 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2451 pc->frame_start_found=0;
2452 pc->state=-1;
2453 return i-3;
2454 }
2455 }
2456 }
2457 }
2458 pc->state= state;
2459 return END_NOT_FOUND;
2460 }
2461
2462 /* handle buffering and image synchronisation */
2463 static int mpeg_decode_frame(AVCodecContext *avctx,
2464 void *data, int *data_size,
2465 uint8_t *buf, int buf_size)
2466 {
2467 Mpeg1Context *s = avctx->priv_data;
2468 uint8_t *buf_end, *buf_ptr;
2469 int ret, start_code, input_size;
2470 AVFrame *picture = data;
2471 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2472 dprintf("fill_buffer\n");
2473
2474 *data_size = 0;
2475
2476 /* special case for last picture */
2477 if (buf_size == 0 && s2->low_delay==0 && s2->next_picture_ptr) {
2478 *picture= *(AVFrame*)s2->next_picture_ptr;
2479 s2->next_picture_ptr= NULL;
2480
2481 *data_size = sizeof(AVFrame);
2482 return 0;
2483 }
2484
2485 if(s2->flags&CODEC_FLAG_TRUNCATED){
2486 int next= mpeg1_find_frame_end(s2, buf, buf_size);
2487
2488 if( ff_combine_frame(s2, next, &buf, &buf_size) < 0 )
2489 return buf_size;
2490 }
2491
2492 buf_ptr = buf;
2493 buf_end = buf + buf_size;
2494
2495 #if 0
2496 if (s->repeat_field % 2 == 1) {
2497 s->repeat_field++;
2498 //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2499 // s2->picture_number, s->repeat_field);
2500 if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2501 *data_size = sizeof(AVPicture);
2502 goto the_end;
2503 }
2504 }
2505 #endif
2506
2507 if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2508 vcr2_init_sequence(avctx);
2509
2510 for(;;) {
2511 /* find start next code */
2512 start_code = find_start_code(&buf_ptr, buf_end);
2513 if (start_code < 0){
2514 if(s2->pict_type != B_TYPE || avctx->hurry_up==0){
2515 if (slice_end(avctx, picture)) {
2516 if(s2->last_picture_ptr) //FIXME merge with the stuff in mpeg_decode_slice
2517 *data_size = sizeof(AVPicture);
2518 }
2519 }
2520 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2521 }
2522
2523 input_size = buf_end - buf_ptr;
2524
2525 if(avctx->debug & FF_DEBUG_STARTCODE){
2526 printf("%3X at %d left %d\n", start_code, buf_ptr-buf, input_size);
2527 }
2528
2529 /* prepare data for next start code */
2530 switch(start_code) {
2531 case SEQ_START_CODE:
2532 mpeg1_decode_sequence(avctx, buf_ptr,
2533 input_size);
2534 break;
2535
2536 case PICTURE_START_CODE:
2537 /* we have a complete image : we try to decompress it */
2538 mpeg1_decode_picture(avctx,
2539 buf_ptr, input_size);
2540 break;
2541 case EXT_START_CODE:
2542 mpeg_decode_extension(avctx,
2543 buf_ptr, input_size);
2544 break;
2545 case USER_START_CODE:
2546 mpeg_decode_user_data(avctx,
2547 buf_ptr, input_size);
2548 break;
2549 case GOP_START_CODE:
2550 s2->first_field=0;
2551 break;
2552 default:
2553 if (start_code >= SLICE_MIN_START_CODE &&
2554 start_code <= SLICE_MAX_START_CODE) {
2555
2556 /* skip b frames if we dont have reference frames */
2557 if(s2->last_picture_ptr==NULL && s2->pict_type==B_TYPE) break;
2558 /* skip b frames if we are in a hurry */
2559 if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2560 /* skip everything if we are in a hurry>=5 */
2561 if(avctx->hurry_up>=5) break;
2562
2563 if (!s->mpeg_enc_ctx_allocated) break;
2564
2565 ret = mpeg_decode_slice(avctx, picture,
2566 start_code, &buf_ptr, input_size);
2567 emms_c();
2568
2569 if(ret < 0){
2570 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2571 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);
2572 if(ret==DECODE_SLICE_FATAL_ERROR) return -1;
2573 }else{
2574 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);
2575 }
2576 }
2577 break;
2578 }
2579 }
2580 }
2581
2582 static int mpeg_decode_end(AVCodecContext *avctx)
2583 {
2584 Mpeg1Context *s = avctx->priv_data;
2585
2586 if (s->mpeg_enc_ctx_allocated)
2587 MPV_common_end(&s->mpeg_enc_ctx);
2588 return 0;
2589 }
2590
2591 AVCodec mpeg1video_decoder = {
2592 "mpeg1video",
2593 CODEC_TYPE_VIDEO,
2594 CODEC_ID_MPEG1VIDEO,
2595 sizeof(Mpeg1Context),
2596 mpeg_decode_init,
2597 NULL,
2598 mpeg_decode_end,
2599 mpeg_decode_frame,
2600 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2601 .flush= ff_mpeg_flush,
2602 };
2603
2604 AVCodec mpeg2video_decoder = {
2605 "mpeg2video",
2606 CODEC_TYPE_VIDEO,
2607 CODEC_ID_MPEG2VIDEO,
2608 sizeof(Mpeg1Context),
2609 mpeg_decode_init,
2610 NULL,
2611 mpeg_decode_end,
2612 mpeg_decode_frame,
2613 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2614 .flush= ff_mpeg_flush,
2615 };
2616
2617 #ifdef HAVE_XVMC
2618 static int mpeg_mc_decode_init(AVCodecContext *avctx){
2619 Mpeg1Context *s;
2620
2621 if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2622 return -1;
2623 if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) )
2624 dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2625
2626 mpeg_decode_init(avctx);
2627 s = avctx->priv_data;
2628
2629 avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2630 avctx->xvmc_acceleration = 1;
2631
2632 return 0;
2633 }
2634
2635 AVCodec mpeg_xvmc_decoder = {
2636 "mpegvideo_xvmc",
2637 CODEC_TYPE_VIDEO,
2638 CODEC_ID_MPEG2VIDEO_XVMC,
2639 sizeof(Mpeg1Context),
2640 mpeg_mc_decode_init,
2641 NULL,
2642 mpeg_decode_end,
2643 mpeg_decode_frame,
2644 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2645 };
2646
2647 #endif
2648
2649 /* this is ugly i know, but the alternative is too make
2650 hundreds of vars global and prefix them with ff_mpeg1_
2651 which is far uglier. */
2652 #include "mdec.c"