2 * MPEG1 codec / MPEG2 decoder
3 * Copyright (c) 2000,2001 Fabrice Bellard.
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.
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.
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
28 #include "mpegvideo.h"
30 #include "mpeg12data.h"
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
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
51 static void mpeg1_encode_block(MpegEncContext *s,
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,
59 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
62 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
65 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
68 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
71 extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
72 extern int XVMC_field_end(MpegEncContext *s);
75 #ifdef CONFIG_ENCODERS
76 static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
77 static uint8_t fcode_tab[MAX_MV*2+1];
79 static uint32_t uni_mpeg1_ac_vlc_bits[64*64*2];
80 static uint8_t uni_mpeg1_ac_vlc_len [64*64*2];
82 /* simple include everything table for dc, first byte is bits number next 3 are code*/
83 static uint32_t mpeg1_lum_dc_uni[512];
84 static uint32_t mpeg1_chr_dc_uni[512];
86 static uint8_t mpeg1_index_run[2][64];
87 static int8_t mpeg1_max_level[2][64];
90 static void init_2d_vlc_rl(RLTable *rl)
94 init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2,
95 &rl->table_vlc[0][1], 4, 2,
96 &rl->table_vlc[0][0], 4, 2);
99 rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
100 for(i=0; i<rl->vlc.table_size; i++){
101 int code= rl->vlc.table[i][0];
102 int len = rl->vlc.table[i][1];
105 if(len==0){ // illegal code
108 }else if(len<0){ //more bits needed
112 if(code==rl->n){ //esc
115 }else if(code==rl->n+1){ //eob
119 run= rl->table_run [code] + 1;
120 level= rl->table_level[code];
123 rl->rl_vlc[0][i].len= len;
124 rl->rl_vlc[0][i].level= level;
125 rl->rl_vlc[0][i].run= run;
129 #ifdef CONFIG_ENCODERS
130 static void init_uni_ac_vlc(RLTable *rl, uint32_t *uni_ac_vlc_bits, uint8_t *uni_ac_vlc_len){
133 for(i=0; i<128; i++){
136 for(run=0; run<64; run++){
139 int alevel= ABS(level);
140 int sign= (level>>31)&1;
142 if (alevel > rl->max_level[0][run])
145 code= rl->index_run[0][run] + alevel - 1;
147 if (code < 111 /* rl->n */) {
148 /* store the vlc & sign at once */
149 len= mpeg1_vlc[code][1]+1;
150 bits= (mpeg1_vlc[code][0]<<1) + sign;
152 len= mpeg1_vlc[111/*rl->n*/][1]+6;
153 bits= mpeg1_vlc[111/*rl->n*/][0]<<6;
163 bits|= 0x8001 + level + 255;
165 bits|= level & 0xffff;
170 uni_ac_vlc_bits[UNI_AC_ENC_INDEX(run, i)]= bits;
171 uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
176 static void put_header(MpegEncContext *s, int header)
178 align_put_bits(&s->pb);
179 put_bits(&s->pb, 16, header>>16);
180 put_bits(&s->pb, 16, header&0xFFFF);
183 /* put sequence header if needed */
184 static void mpeg1_encode_sequence_header(MpegEncContext *s)
186 unsigned int vbv_buffer_size;
190 float best_aspect_error= 1E10;
191 float aspect_ratio= s->avctx->aspect_ratio;
192 int constraint_parameter_flag;
194 if(aspect_ratio==0.0) aspect_ratio= s->width / (float)s->height; //pixel aspect 1:1 (VGA)
196 if (s->current_picture.key_frame) {
197 /* mpeg1 header repeated every gop */
198 put_header(s, SEQ_START_CODE);
200 /* search closest frame rate */
203 s->frame_rate_index = 0;
206 if(s->avctx->strict_std_compliance >= 0 && i>=9) break;
208 d = abs(MPEG1_FRAME_RATE_BASE*(int64_t)s->avctx->frame_rate/s->avctx->frame_rate_base - frame_rate_tab[i]);
211 s->frame_rate_index = i;
216 put_bits(&s->pb, 12, s->width);
217 put_bits(&s->pb, 12, s->height);
220 float error= mpeg1_aspect[i] - s->width/(s->height*aspect_ratio);
223 if(error < best_aspect_error){
224 best_aspect_error= error;
225 s->aspect_ratio_info= i;
229 put_bits(&s->pb, 4, s->aspect_ratio_info);
230 put_bits(&s->pb, 4, s->frame_rate_index);
232 if(s->avctx->rc_max_rate){
233 v = (s->avctx->rc_max_rate + 399) / 400;
234 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
240 if(s->avctx->rc_buffer_size)
241 vbv_buffer_size = s->avctx->rc_buffer_size;
243 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
244 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
245 vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
247 put_bits(&s->pb, 18, v & 0x3FFFF);
248 put_bits(&s->pb, 1, 1); /* marker */
249 put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
251 constraint_parameter_flag=
252 s->width <= 768 && s->height <= 576 &&
253 s->mb_width * s->mb_height <= 396 &&
254 s->mb_width * s->mb_height * frame_rate_tab[s->frame_rate_index] <= MPEG1_FRAME_RATE_BASE*396*25 &&
255 frame_rate_tab[s->frame_rate_index] <= MPEG1_FRAME_RATE_BASE*30 &&
256 vbv_buffer_size <= 20 &&
258 s->codec_id == CODEC_ID_MPEG1VIDEO;
260 put_bits(&s->pb, 1, constraint_parameter_flag);
262 ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
263 ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
265 if(s->codec_id == CODEC_ID_MPEG2VIDEO){
266 put_header(s, EXT_START_CODE);
267 put_bits(&s->pb, 4, 1); //seq ext
268 put_bits(&s->pb, 1, 0); //esc
269 put_bits(&s->pb, 3, 4); //profile
270 put_bits(&s->pb, 4, 8); //level
271 put_bits(&s->pb, 1, s->progressive_sequence=1);
272 put_bits(&s->pb, 2, 1); //chroma format 4:2:0
273 put_bits(&s->pb, 2, 0); //horizontal size ext
274 put_bits(&s->pb, 2, 0); //vertical size ext
275 put_bits(&s->pb, 12, v>>18); //bitrate ext
276 put_bits(&s->pb, 1, 1); //marker
277 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
278 put_bits(&s->pb, 1, s->low_delay);
279 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
280 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
283 put_header(s, GOP_START_CODE);
284 put_bits(&s->pb, 1, 0); /* do drop frame */
285 /* time code : we must convert from the real frame rate to a
286 fake mpeg frame rate in case of low frame rate */
287 fps = frame_rate_tab[s->frame_rate_index];
288 time_code = (int64_t)s->fake_picture_number * MPEG1_FRAME_RATE_BASE;
289 s->gop_picture_number = s->fake_picture_number;
290 put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
291 put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
292 put_bits(&s->pb, 1, 1);
293 put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
294 put_bits(&s->pb, 6, (uint32_t)((time_code % fps) / MPEG1_FRAME_RATE_BASE));
295 put_bits(&s->pb, 1, 0); /* closed gop */
296 put_bits(&s->pb, 1, 0); /* broken link */
299 if (s->avctx->frame_rate < (24 * s->avctx->frame_rate_base) && s->picture_number > 0) {
300 /* insert empty P pictures to slow down to the desired
301 frame rate. Each fake pictures takes about 20 bytes */
302 fps = frame_rate_tab[s->frame_rate_index];
303 n = av_rescale((int64_t)s->picture_number * s->avctx->frame_rate_base, fps, s->avctx->frame_rate) / MPEG1_FRAME_RATE_BASE - 1;
304 while (s->fake_picture_number < n) {
305 mpeg1_skip_picture(s, s->fake_picture_number -
306 s->gop_picture_number);
307 s->fake_picture_number++;
313 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
315 put_bits(&s->pb, 11, 0x008);
318 put_bits(&s->pb, mbAddrIncrTable[run][1],
319 mbAddrIncrTable[run][0]);
322 /* insert a fake P picture */
323 static void mpeg1_skip_picture(MpegEncContext *s, int pict_num)
325 assert(s->codec_id == CODEC_ID_MPEG1VIDEO); // mpeg2 can do these repeat things
327 /* mpeg1 picture header */
328 put_header(s, PICTURE_START_CODE);
329 /* temporal reference */
330 put_bits(&s->pb, 10, pict_num & 0x3ff);
332 put_bits(&s->pb, 3, P_TYPE);
333 put_bits(&s->pb, 16, 0xffff); /* non constant bit rate */
335 put_bits(&s->pb, 1, 1); /* integer coordinates */
336 put_bits(&s->pb, 3, 1); /* forward_f_code */
338 put_bits(&s->pb, 1, 0); /* extra bit picture */
341 put_header(s, SLICE_MIN_START_CODE);
342 put_bits(&s->pb, 5, 1); /* quantizer scale */
343 put_bits(&s->pb, 1, 0); /* slice extra information */
345 encode_mb_skip_run(s, 0);
347 /* empty macroblock */
348 put_bits(&s->pb, 3, 1); /* motion only */
350 /* zero motion x & y */
351 put_bits(&s->pb, 1, 1);
352 put_bits(&s->pb, 1, 1);
354 /* output a number of empty slice */
355 encode_mb_skip_run(s, s->mb_width * s->mb_height - 2);
357 /* empty macroblock */
358 put_bits(&s->pb, 3, 1); /* motion only */
360 /* zero motion x & y */
361 put_bits(&s->pb, 1, 1);
362 put_bits(&s->pb, 1, 1);
366 static void common_init(MpegEncContext *s)
369 s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
372 void ff_mpeg1_clean_buffers(MpegEncContext *s){
373 s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
374 s->last_dc[1] = s->last_dc[0];
375 s->last_dc[2] = s->last_dc[0];
376 memset(s->last_mv, 0, sizeof(s->last_mv));
379 #ifdef CONFIG_ENCODERS
381 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
382 put_header(s, SLICE_MIN_START_CODE + s->mb_y);
383 put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
384 put_bits(&s->pb, 1, 0); /* slice extra information */
387 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
389 mpeg1_encode_sequence_header(s);
391 /* mpeg1 picture header */
392 put_header(s, PICTURE_START_CODE);
393 /* temporal reference */
395 // RAL: s->picture_number instead of s->fake_picture_number
396 put_bits(&s->pb, 10, (s->picture_number -
397 s->gop_picture_number) & 0x3ff);
398 s->fake_picture_number++;
400 put_bits(&s->pb, 3, s->pict_type);
401 put_bits(&s->pb, 16, 0xffff); /* non constant bit rate */
403 // RAL: Forward f_code also needed for B frames
404 if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
405 put_bits(&s->pb, 1, 0); /* half pel coordinates */
406 if(s->codec_id == CODEC_ID_MPEG1VIDEO)
407 put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
409 put_bits(&s->pb, 3, 7); /* forward_f_code */
412 // RAL: Backward f_code necessary for B frames
413 if (s->pict_type == B_TYPE) {
414 put_bits(&s->pb, 1, 0); /* half pel coordinates */
415 if(s->codec_id == CODEC_ID_MPEG1VIDEO)
416 put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
418 put_bits(&s->pb, 3, 7); /* backward_f_code */
421 put_bits(&s->pb, 1, 0); /* extra bit picture */
423 if(s->codec_id == CODEC_ID_MPEG2VIDEO){
424 put_header(s, EXT_START_CODE);
425 put_bits(&s->pb, 4, 8); //pic ext
426 if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
427 put_bits(&s->pb, 4, s->f_code);
428 put_bits(&s->pb, 4, s->f_code);
430 put_bits(&s->pb, 8, 255);
432 if (s->pict_type == B_TYPE) {
433 put_bits(&s->pb, 4, s->b_code);
434 put_bits(&s->pb, 4, s->b_code);
436 put_bits(&s->pb, 8, 255);
438 put_bits(&s->pb, 2, s->intra_dc_precision);
439 put_bits(&s->pb, 2, s->picture_structure= PICT_FRAME);
440 put_bits(&s->pb, 1, s->top_field_first);
441 put_bits(&s->pb, 1, s->frame_pred_frame_dct= 1);
442 put_bits(&s->pb, 1, s->concealment_motion_vectors);
443 put_bits(&s->pb, 1, s->q_scale_type);
444 put_bits(&s->pb, 1, s->intra_vlc_format);
445 put_bits(&s->pb, 1, s->alternate_scan);
446 put_bits(&s->pb, 1, s->repeat_first_field);
447 put_bits(&s->pb, 1, s->chroma_420_type=1);
448 put_bits(&s->pb, 1, s->progressive_frame=1);
449 put_bits(&s->pb, 1, 0); //composite_display_flag
453 ff_mpeg1_encode_slice_header(s);
456 void mpeg1_encode_mb(MpegEncContext *s,
457 DCTELEM block[6][64],
458 int motion_x, int motion_y)
461 const int mb_x = s->mb_x;
462 const int mb_y = s->mb_y;
463 const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
468 if (s->block_last_index[i] >= 0)
472 if (cbp == 0 && !first_mb && (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
473 ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
474 (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) |
475 ((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))) {
477 s->qscale -= s->dquant;
483 assert(s->mb_skip_run == 0);
484 encode_mb_skip_run(s, s->mb_x);
486 encode_mb_skip_run(s, s->mb_skip_run);
489 if (s->pict_type == I_TYPE) {
490 if(s->dquant && cbp){
491 put_bits(&s->pb, 2, 1); /* macroblock_type : macroblock_quant = 1 */
492 put_bits(&s->pb, 5, s->qscale);
494 put_bits(&s->pb, 1, 1); /* macroblock_type : macroblock_quant = 0 */
495 s->qscale -= s->dquant;
497 s->misc_bits+= get_bits_diff(s);
499 } else if (s->mb_intra) {
500 if(s->dquant && cbp){
501 put_bits(&s->pb, 6, 0x01);
502 put_bits(&s->pb, 5, s->qscale);
504 put_bits(&s->pb, 5, 0x03);
505 s->qscale -= s->dquant;
507 s->misc_bits+= get_bits_diff(s);
509 s->last_mv[0][0][0] =
510 s->last_mv[0][0][1] = 0;
511 } else if (s->pict_type == P_TYPE) {
513 if (motion_x == 0 && motion_y == 0) {
515 put_bits(&s->pb, 5, 1); /* macroblock_pattern & quant */
516 put_bits(&s->pb, 5, s->qscale);
518 put_bits(&s->pb, 2, 1); /* macroblock_pattern only */
520 s->misc_bits+= get_bits_diff(s);
521 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
524 put_bits(&s->pb, 5, 2); /* motion + cbp */
525 put_bits(&s->pb, 5, s->qscale);
527 put_bits(&s->pb, 1, 1); /* motion + cbp */
529 s->misc_bits+= get_bits_diff(s);
530 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added
531 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added
532 s->mv_bits+= get_bits_diff(s);
533 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
536 put_bits(&s->pb, 3, 1); /* motion only */
537 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added
538 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added
539 s->qscale -= s->dquant;
540 s->mv_bits+= get_bits_diff(s);
544 { // RAL: All the following bloc added for B frames:
546 { // With coded bloc pattern
547 if (s->mv_dir == (MV_DIR_FORWARD | MV_DIR_BACKWARD))
548 { // Bi-directional motion
551 put_bits(&s->pb, 5, 2);
552 put_bits(&s->pb, 5, s->qscale);
554 else // Without QScale
555 put_bits(&s->pb, 2, 3);
556 s->misc_bits += get_bits_diff(s);
557 mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
558 mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
559 mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
560 mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
563 s->mv_bits += get_bits_diff(s);
564 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
566 else if (s->mv_dir == MV_DIR_BACKWARD)
570 put_bits(&s->pb, 6, 2);
571 put_bits(&s->pb, 5, s->qscale);
573 else // Without QScale
574 put_bits(&s->pb, 3, 3);
575 s->misc_bits += get_bits_diff(s);
576 mpeg1_encode_motion(s, motion_x - s->last_mv[1][0][0], s->b_code);
577 mpeg1_encode_motion(s, motion_y - s->last_mv[1][0][1], s->b_code);
579 s->mv_bits += get_bits_diff(s);
580 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
582 else if (s->mv_dir == MV_DIR_FORWARD)
586 put_bits(&s->pb, 6, 3);
587 put_bits(&s->pb, 5, s->qscale);
589 else // Without QScale
590 put_bits(&s->pb, 4, 3);
591 s->misc_bits += get_bits_diff(s);
592 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);
593 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);
595 s->mv_bits += get_bits_diff(s);
596 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
600 { // No coded bloc pattern
601 if (s->mv_dir == (MV_DIR_FORWARD | MV_DIR_BACKWARD))
602 { // Bi-directional motion
603 put_bits(&s->pb, 2, 2); /* backward & forward motion */
604 mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
605 mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
606 mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
607 mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
611 else if (s->mv_dir == MV_DIR_BACKWARD)
613 put_bits(&s->pb, 3, 2); /* backward motion only */
614 mpeg1_encode_motion(s, motion_x - s->last_mv[1][0][0], s->b_code);
615 mpeg1_encode_motion(s, motion_y - s->last_mv[1][0][1], s->b_code);
618 else if (s->mv_dir == MV_DIR_FORWARD)
620 put_bits(&s->pb, 4, 2); /* forward motion only */
621 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);
622 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);
625 s->qscale -= s->dquant;
626 s->mv_bits += get_bits_diff(s);
628 // End of bloc from RAL
631 if (cbp & (1 << (5 - i))) {
632 mpeg1_encode_block(s, block[i], i);
637 s->i_tex_bits+= get_bits_diff(s);
639 s->p_tex_bits+= get_bits_diff(s);
643 if (s->mv_dir & MV_DIR_FORWARD)
645 s->last_mv[0][0][0]= s->mv[0][0][0];
646 s->last_mv[0][0][1]= s->mv[0][0][1];
648 if (s->mv_dir & MV_DIR_BACKWARD)
650 s->last_mv[1][0][0]= s->mv[1][0][0];
651 s->last_mv[1][0][1]= s->mv[1][0][1];
655 // RAL: Parameter added: f_or_b_code
656 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
658 int code, bit_size, l, m, bits, range, sign;
664 mbMotionVectorTable[0][1],
665 mbMotionVectorTable[0][0]);
667 bit_size = f_or_b_code - 1;
668 range = 1 << bit_size;
669 /* modulo encoding */
674 } else if (val >= l) {
680 code = (val >> bit_size) + 1;
681 bits = val & (range - 1);
686 code = (val >> bit_size) + 1;
687 bits = val & (range - 1);
691 assert(code > 0 && code <= 16);
694 mbMotionVectorTable[code][1],
695 mbMotionVectorTable[code][0]);
697 put_bits(&s->pb, 1, sign);
699 put_bits(&s->pb, bit_size, bits);
704 void ff_mpeg1_encode_init(MpegEncContext *s)
720 mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
721 mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
724 init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_bits, uni_mpeg1_ac_vlc_len);
726 /* build unified dc encoding tables */
727 for(i=-255; i<256; i++)
735 index = vlc_dc_table[adiff];
737 bits= vlc_dc_lum_bits[index] + index;
738 code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
739 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
741 bits= vlc_dc_chroma_bits[index] + index;
742 code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
743 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
746 mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
748 for(f_code=1; f_code<=MAX_FCODE; f_code++){
749 for(mv=-MAX_MV; mv<=MAX_MV; mv++){
752 if(mv==0) len= mbMotionVectorTable[0][1];
754 int val, bit_size, range, code;
756 bit_size = s->f_code - 1;
757 range = 1 << bit_size;
763 code = (val >> bit_size) + 1;
765 len= mbMotionVectorTable[code][1] + 1 + bit_size;
767 len= mbMotionVectorTable[16][1] + 2 + bit_size;
771 mv_penalty[f_code][mv+MAX_MV]= len;
776 for(f_code=MAX_FCODE; f_code>0; f_code--){
777 for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
778 fcode_tab[mv+MAX_MV]= f_code;
782 s->me.mv_penalty= mv_penalty;
783 s->fcode_tab= fcode_tab;
784 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
791 s->intra_ac_vlc_length=
792 s->inter_ac_vlc_length= uni_mpeg1_ac_vlc_len;
795 static inline void encode_dc(MpegEncContext *s, int diff, int component)
797 if (component == 0) {
800 mpeg1_lum_dc_uni[diff+255]&0xFF,
801 mpeg1_lum_dc_uni[diff+255]>>8);
805 mpeg1_chr_dc_uni[diff+255]&0xFF,
806 mpeg1_chr_dc_uni[diff+255]>>8);
810 static void mpeg1_encode_block(MpegEncContext *s,
814 int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
816 // RLTable *rl = &rl_mpeg1;
818 last_index = s->block_last_index[n];
822 component = (n <= 3 ? 0 : n - 4 + 1);
823 dc = block[0]; /* overflow is impossible */
824 diff = dc - s->last_dc[component];
825 encode_dc(s, diff, component);
826 s->last_dc[component] = dc;
829 if (s->intra_vlc_format)
835 /* encode the first coefficient : needs to be done here because
836 it is handled slightly differently */
838 if (abs(level) == 1) {
839 code = ((uint32_t)level >> 31); /* the sign bit */
840 put_bits(&s->pb, 2, code | 0x02);
849 /* now quantify & encode AC coefs */
850 last_non_zero = i - 1;
852 for(;i<=last_index;i++) {
853 j = s->intra_scantable.permutated[i];
858 dprintf("level[%d]=%d\n", i, level);
860 /* encode using VLC */
862 run = i - last_non_zero - 1;
865 MASK_ABS(sign, alevel)
868 // code = get_rl_index(rl, 0, run, alevel);
869 if (alevel <= mpeg1_max_level[0][run]){
870 code= mpeg1_index_run[0][run] + alevel - 1;
871 /* store the vlc & sign at once */
872 put_bits(&s->pb, mpeg1_vlc[code][1]+1, (mpeg1_vlc[code][0]<<1) + sign);
874 /* escape seems to be pretty rare <5% so i dont optimize it */
875 put_bits(&s->pb, mpeg1_vlc[111/*rl->n*/][1], mpeg1_vlc[111/*rl->n*/][0]);
876 /* escape: only clip in this case */
877 put_bits(&s->pb, 6, run);
878 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
880 put_bits(&s->pb, 8, level & 0xff);
883 put_bits(&s->pb, 16, 0x8001 + level + 255);
885 put_bits(&s->pb, 16, level & 0xffff);
889 put_bits(&s->pb, 12, level & 0xfff);
896 put_bits(&s->pb, 2, 0x2);
898 #endif //CONFIG_ENCODERS
900 /******************************************/
903 static VLC dc_lum_vlc;
904 static VLC dc_chroma_vlc;
906 static VLC mbincr_vlc;
907 static VLC mb_ptype_vlc;
908 static VLC mb_btype_vlc;
909 static VLC mb_pat_vlc;
911 static void init_vlcs()
918 init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
919 vlc_dc_lum_bits, 1, 1,
920 vlc_dc_lum_code, 2, 2);
921 init_vlc(&dc_chroma_vlc, DC_VLC_BITS, 12,
922 vlc_dc_chroma_bits, 1, 1,
923 vlc_dc_chroma_code, 2, 2);
924 init_vlc(&mv_vlc, MV_VLC_BITS, 17,
925 &mbMotionVectorTable[0][1], 2, 1,
926 &mbMotionVectorTable[0][0], 2, 1);
927 init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
928 &mbAddrIncrTable[0][1], 2, 1,
929 &mbAddrIncrTable[0][0], 2, 1);
930 init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 63,
931 &mbPatTable[0][1], 2, 1,
932 &mbPatTable[0][0], 2, 1);
934 init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
935 &table_mb_ptype[0][1], 2, 1,
936 &table_mb_ptype[0][0], 2, 1);
937 init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
938 &table_mb_btype[0][1], 2, 1,
939 &table_mb_btype[0][0], 2, 1);
943 init_2d_vlc_rl(&rl_mpeg1);
944 init_2d_vlc_rl(&rl_mpeg2);
948 static inline int get_dmv(MpegEncContext *s)
950 if(get_bits1(&s->gb))
951 return 1 - (get_bits1(&s->gb) << 1);
956 static inline int get_qscale(MpegEncContext *s)
958 int qscale = get_bits(&s->gb, 5);
959 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
960 if (s->q_scale_type) {
961 return non_linear_qscale[qscale];
969 /* motion type (for mpeg2) */
975 static int mpeg_decode_mb(MpegEncContext *s,
976 DCTELEM block[6][64])
978 int i, j, k, cbp, val, mb_type, motion_type;
980 dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
982 assert(s->mb_skiped==0);
984 if (s->mb_skip_run-- != 0) {
985 if(s->pict_type == I_TYPE){
986 fprintf(stderr, "skiped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
993 s->block_last_index[i] = -1;
994 s->mv_type = MV_TYPE_16X16;
995 if (s->pict_type == P_TYPE) {
996 /* if P type, zero motion vector is implied */
997 s->mv_dir = MV_DIR_FORWARD;
998 s->mv[0][0][0] = s->mv[0][0][1] = 0;
999 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1000 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1002 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1004 /* if B type, reuse previous vectors and directions */
1005 s->mv[0][0][0] = s->last_mv[0][0][0];
1006 s->mv[0][0][1] = s->last_mv[0][0][1];
1007 s->mv[1][0][0] = s->last_mv[1][0][0];
1008 s->mv[1][0][1] = s->last_mv[1][0][1];
1010 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
1011 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1] | MB_TYPE_SKIP;
1012 // assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1014 if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
1021 switch(s->pict_type) {
1024 if (get_bits1(&s->gb) == 0) {
1025 if (get_bits1(&s->gb) == 0){
1026 fprintf(stderr, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1029 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1031 mb_type = MB_TYPE_INTRA;
1035 mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1037 fprintf(stderr, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1040 mb_type = ptype2mb_type[ mb_type ];
1043 mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1045 fprintf(stderr, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1048 mb_type = btype2mb_type[ mb_type ];
1051 dprintf("mb_type=%x\n", mb_type);
1052 // motion_type = 0; /* avoid warning */
1053 if (IS_INTRA(mb_type)) {
1054 /* compute dct type */
1055 if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1056 !s->frame_pred_frame_dct) {
1057 s->interlaced_dct = get_bits1(&s->gb);
1060 if (IS_QUANT(mb_type))
1061 s->qscale = get_qscale(s);
1063 if (s->concealment_motion_vectors) {
1064 /* just parse them */
1065 if (s->picture_structure != PICT_FRAME)
1066 skip_bits1(&s->gb); /* field select */
1068 s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
1069 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1070 s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
1071 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1073 skip_bits1(&s->gb); /* marker */
1075 memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1078 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1080 if (mpeg2_decode_block_intra(s, block[i], i) < 0)
1085 if (mpeg1_decode_block_intra(s, block[i], i) < 0)
1090 if (mb_type & MB_TYPE_ZERO_MV){
1091 assert(mb_type & MB_TYPE_PAT);
1093 /* compute dct type */
1094 if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1095 !s->frame_pred_frame_dct) {
1096 s->interlaced_dct = get_bits1(&s->gb);
1099 if (IS_QUANT(mb_type))
1100 s->qscale = get_qscale(s);
1102 s->mv_dir = MV_DIR_FORWARD;
1103 s->mv_type = MV_TYPE_16X16;
1104 s->last_mv[0][0][0] = 0;
1105 s->last_mv[0][0][1] = 0;
1106 s->last_mv[0][1][0] = 0;
1107 s->last_mv[0][1][1] = 0;
1111 assert(mb_type & MB_TYPE_L0L1);
1112 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1113 /* get additionnal motion vector type */
1114 if (s->frame_pred_frame_dct)
1115 motion_type = MT_FRAME;
1117 motion_type = get_bits(&s->gb, 2);
1120 /* compute dct type */
1121 if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1122 !s->frame_pred_frame_dct && IS_PAT(mb_type)) {
1123 s->interlaced_dct = get_bits1(&s->gb);
1126 if (IS_QUANT(mb_type))
1127 s->qscale = get_qscale(s);
1129 /* motion vectors */
1132 if (USES_LIST(mb_type, i)) {
1133 s->mv_dir |= (MV_DIR_FORWARD >> i);
1134 dprintf("motion_type=%d\n", motion_type);
1135 switch(motion_type) {
1136 case MT_FRAME: /* or MT_16X8 */
1137 if (s->picture_structure == PICT_FRAME) {
1139 mb_type |= MB_TYPE_16x16;
1140 s->mv_type = MV_TYPE_16X16;
1141 s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
1142 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1143 s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
1144 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1145 /* full_pel: only for mpeg1 */
1146 if (s->full_pel[i]){
1147 s->mv[i][0][0] <<= 1;
1148 s->mv[i][0][1] <<= 1;
1152 mb_type |= MB_TYPE_16x8;
1153 s->mv_type = MV_TYPE_16X8;
1155 s->field_select[i][j] = get_bits1(&s->gb);
1157 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1158 s->last_mv[i][j][k]);
1159 s->last_mv[i][j][k] = val;
1160 s->mv[i][j][k] = val;
1166 s->mv_type = MV_TYPE_FIELD;
1167 if (s->picture_structure == PICT_FRAME) {
1168 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1170 s->field_select[i][j] = get_bits1(&s->gb);
1171 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1172 s->last_mv[i][j][0]);
1173 s->last_mv[i][j][0] = val;
1174 s->mv[i][j][0] = val;
1175 dprintf("fmx=%d\n", val);
1176 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1177 s->last_mv[i][j][1] >> 1);
1178 s->last_mv[i][j][1] = val << 1;
1179 s->mv[i][j][1] = val;
1180 dprintf("fmy=%d\n", val);
1183 mb_type |= MB_TYPE_16x16;
1184 s->field_select[i][0] = get_bits1(&s->gb);
1186 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1187 s->last_mv[i][0][k]);
1188 s->last_mv[i][0][k] = val;
1189 s->last_mv[i][1][k] = val;
1190 s->mv[i][0][k] = val;
1196 int dmx, dmy, mx, my, m;
1198 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1199 s->last_mv[i][0][0]);
1200 s->last_mv[i][0][0] = mx;
1201 s->last_mv[i][1][0] = mx;
1203 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1204 s->last_mv[i][0][1] >> 1);
1206 s->mv_type = MV_TYPE_DMV;
1209 s->last_mv[i][0][1] = my<<1;
1210 s->last_mv[i][1][1] = my<<1;
1212 s->mv[i][0][0] = mx;
1213 s->mv[i][0][1] = my;
1214 s->mv[i][1][0] = mx;//not used
1215 s->mv[i][1][1] = my;//not used
1217 if (s->picture_structure == PICT_FRAME) {
1218 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1220 //m = 1 + 2 * s->top_field_first;
1221 m = s->top_field_first ? 1 : 3;
1223 /* top -> top pred */
1224 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1225 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1227 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1228 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1230 mb_type |= MB_TYPE_16x16;
1232 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1233 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1234 if(s->picture_structure == PICT_TOP_FIELD)
1248 if (IS_PAT(mb_type)) {
1249 cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1251 fprintf(stderr, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1256 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1259 if (mpeg2_decode_block_non_intra(s, block[i], i) < 0)
1262 s->block_last_index[i] = -1;
1269 if (mpeg1_decode_block_inter(s, block[i], i) < 0)
1272 s->block_last_index[i] = -1;
1279 s->block_last_index[i] = -1;
1283 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1288 /* as h263, but only 17 codes */
1289 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1291 int code, sign, val, l, shift;
1293 code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1301 sign = get_bits1(&s->gb);
1305 val = (val - 1) << shift;
1306 val |= get_bits(&s->gb, shift);
1313 /* modulo decoding */
1315 val = ((val + l)&(l*2-1)) - l;
1319 static inline int decode_dc(GetBitContext *gb, int component)
1323 if (component == 0) {
1324 code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1326 code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1329 fprintf(stderr, "invalid dc code at\n");
1335 diff = get_xbits(gb, code);
1340 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
1344 int level, dc, diff, i, j, run;
1346 RLTable *rl = &rl_mpeg1;
1347 uint8_t * const scantable= s->intra_scantable.permutated;
1348 const uint16_t *quant_matrix= s->intra_matrix;
1349 const int qscale= s->qscale;
1352 component = (n <= 3 ? 0 : n - 4 + 1);
1353 diff = decode_dc(&s->gb, component);
1356 dc = s->last_dc[component];
1358 s->last_dc[component] = dc;
1360 dprintf("dc=%d diff=%d\n", dc, diff);
1363 OPEN_READER(re, &s->gb);
1364 /* now quantify & encode AC coefs */
1366 UPDATE_CACHE(re, &s->gb);
1367 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1371 } else if(level != 0) {
1374 level= (level*qscale*quant_matrix[j])>>3;
1376 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1377 LAST_SKIP_BITS(re, &s->gb, 1);
1380 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1381 UPDATE_CACHE(re, &s->gb);
1382 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1383 if (level == -128) {
1384 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1385 } else if (level == 0) {
1386 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
1392 level= (level*qscale*quant_matrix[j])>>3;
1396 level= (level*qscale*quant_matrix[j])>>3;
1401 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1407 CLOSE_READER(re, &s->gb);
1409 s->block_last_index[n] = i;
1413 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
1417 int level, i, j, run;
1418 RLTable *rl = &rl_mpeg1;
1419 uint8_t * const scantable= s->intra_scantable.permutated;
1420 const uint16_t *quant_matrix= s->inter_matrix;
1421 const int qscale= s->qscale;
1425 OPEN_READER(re, &s->gb);
1427 /* special case for the first coef. no need to add a second vlc table */
1428 UPDATE_CACHE(re, &s->gb);
1429 v= SHOW_UBITS(re, &s->gb, 2);
1431 LAST_SKIP_BITS(re, &s->gb, 2);
1432 level= (3*qscale*quant_matrix[0])>>4;
1440 /* now quantify & encode AC coefs */
1442 UPDATE_CACHE(re, &s->gb);
1443 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1447 } else if(level != 0) {
1450 level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1452 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1453 LAST_SKIP_BITS(re, &s->gb, 1);
1456 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1457 UPDATE_CACHE(re, &s->gb);
1458 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1459 if (level == -128) {
1460 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1461 } else if (level == 0) {
1462 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
1468 level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1472 level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1477 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1483 CLOSE_READER(re, &s->gb);
1485 s->block_last_index[n] = i;
1489 /* Also does unquantization here, since I will never support mpeg2
1491 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
1495 int level, i, j, run;
1496 RLTable *rl = &rl_mpeg1;
1497 uint8_t * const scantable= s->intra_scantable.permutated;
1498 const uint16_t *quant_matrix;
1499 const int qscale= s->qscale;
1506 OPEN_READER(re, &s->gb);
1509 quant_matrix = s->inter_matrix;
1511 quant_matrix = s->chroma_inter_matrix;
1513 /* special case for the first coef. no need to add a second vlc table */
1514 UPDATE_CACHE(re, &s->gb);
1515 v= SHOW_UBITS(re, &s->gb, 2);
1517 LAST_SKIP_BITS(re, &s->gb, 2);
1518 level= (3*qscale*quant_matrix[0])>>5;
1526 /* now quantify & encode AC coefs */
1528 UPDATE_CACHE(re, &s->gb);
1529 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1533 } else if(level != 0) {
1536 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1537 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1538 LAST_SKIP_BITS(re, &s->gb, 1);
1541 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1542 UPDATE_CACHE(re, &s->gb);
1543 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1548 level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1551 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1555 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1562 CLOSE_READER(re, &s->gb);
1564 block[63] ^= (mismatch & 1);
1566 s->block_last_index[n] = i;
1570 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1574 int level, dc, diff, i, j, run;
1577 uint8_t * const scantable= s->intra_scantable.permutated;
1578 const uint16_t *quant_matrix;
1579 const int qscale= s->qscale;
1584 quant_matrix = s->intra_matrix;
1587 quant_matrix = s->chroma_intra_matrix;
1590 diff = decode_dc(&s->gb, component);
1593 dc = s->last_dc[component];
1595 s->last_dc[component] = dc;
1596 block[0] = dc << (3 - s->intra_dc_precision);
1597 dprintf("dc=%d\n", block[0]);
1598 mismatch = block[0] ^ 1;
1600 if (s->intra_vlc_format)
1606 OPEN_READER(re, &s->gb);
1607 /* now quantify & encode AC coefs */
1609 UPDATE_CACHE(re, &s->gb);
1610 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1614 } else if(level != 0) {
1617 level= (level*qscale*quant_matrix[j])>>4;
1618 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1619 LAST_SKIP_BITS(re, &s->gb, 1);
1622 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1623 UPDATE_CACHE(re, &s->gb);
1624 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1628 level= (-level*qscale*quant_matrix[j])>>4;
1631 level= (level*qscale*quant_matrix[j])>>4;
1635 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1642 CLOSE_READER(re, &s->gb);
1644 block[63]^= mismatch&1;
1646 s->block_last_index[n] = i;
1650 typedef struct Mpeg1Context {
1651 MpegEncContext mpeg_enc_ctx;
1652 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1653 int repeat_field; /* true if we must repeat the field */
1656 static int mpeg_decode_init(AVCodecContext *avctx)
1658 Mpeg1Context *s = avctx->priv_data;
1660 s->mpeg_enc_ctx.flags= avctx->flags;
1661 common_init(&s->mpeg_enc_ctx);
1664 s->mpeg_enc_ctx_allocated = 0;
1665 s->mpeg_enc_ctx.picture_number = 0;
1666 s->repeat_field = 0;
1667 s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1671 /* return the 8 bit start code value and update the search
1672 state. Return -1 if no start code found */
1673 static int find_start_code(uint8_t **pbuf_ptr, uint8_t *buf_end)
1676 unsigned int state=0xFFFFFFFF, v;
1679 buf_ptr = *pbuf_ptr;
1680 while (buf_ptr < buf_end) {
1682 if (state == 0x000001) {
1683 state = ((state << 8) | v) & 0xffffff;
1687 state = ((state << 8) | v) & 0xffffff;
1691 *pbuf_ptr = buf_ptr;
1695 static int mpeg1_decode_picture(AVCodecContext *avctx,
1696 uint8_t *buf, int buf_size)
1698 Mpeg1Context *s1 = avctx->priv_data;
1699 MpegEncContext *s = &s1->mpeg_enc_ctx;
1702 init_get_bits(&s->gb, buf, buf_size*8);
1704 ref = get_bits(&s->gb, 10); /* temporal ref */
1705 s->pict_type = get_bits(&s->gb, 3);
1706 dprintf("pict_type=%d number=%d\n", s->pict_type, s->picture_number);
1708 skip_bits(&s->gb, 16);
1709 if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1710 s->full_pel[0] = get_bits1(&s->gb);
1711 f_code = get_bits(&s->gb, 3);
1714 s->mpeg_f_code[0][0] = f_code;
1715 s->mpeg_f_code[0][1] = f_code;
1717 if (s->pict_type == B_TYPE) {
1718 s->full_pel[1] = get_bits1(&s->gb);
1719 f_code = get_bits(&s->gb, 3);
1722 s->mpeg_f_code[1][0] = f_code;
1723 s->mpeg_f_code[1][1] = f_code;
1725 s->current_picture.pict_type= s->pict_type;
1726 s->current_picture.key_frame= s->pict_type == I_TYPE;
1734 static void mpeg_decode_sequence_extension(MpegEncContext *s)
1736 int horiz_size_ext, vert_size_ext;
1737 int bit_rate_ext, vbv_buf_ext;
1738 int frame_rate_ext_n, frame_rate_ext_d;
1742 skip_bits(&s->gb, 1); /* profil and level esc*/
1743 profile= get_bits(&s->gb, 3);
1744 level= get_bits(&s->gb, 4);
1745 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1746 skip_bits(&s->gb, 2); /* chroma_format */
1747 horiz_size_ext = get_bits(&s->gb, 2);
1748 vert_size_ext = get_bits(&s->gb, 2);
1749 s->width |= (horiz_size_ext << 12);
1750 s->height |= (vert_size_ext << 12);
1751 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1752 s->bit_rate = ((s->bit_rate / 400) | (bit_rate_ext << 12)) * 400;
1753 skip_bits1(&s->gb); /* marker */
1754 vbv_buf_ext = get_bits(&s->gb, 8);
1756 s->low_delay = get_bits1(&s->gb);
1757 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1759 frame_rate_ext_n = get_bits(&s->gb, 2);
1760 frame_rate_ext_d = get_bits(&s->gb, 5);
1762 &s->avctx->frame_rate,
1763 &s->avctx->frame_rate_base,
1764 frame_rate_tab[s->frame_rate_index] * (frame_rate_ext_n+1),
1765 MPEG1_FRAME_RATE_BASE * (frame_rate_ext_d+1),
1768 dprintf("sequence extension\n");
1769 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1770 s->avctx->sub_id = 2; /* indicates mpeg2 found */
1772 aspect= mpeg2_aspect[s->aspect_ratio_info];
1773 if(aspect>0.0) s->avctx->aspect_ratio= s->width/(aspect*s->height);
1774 else if(aspect<0.0) s->avctx->aspect_ratio= -1.0/aspect;
1776 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1777 printf("profile: %d, level: %d \n", profile, level);
1780 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1784 dprintf("matrix extension\n");
1786 if (get_bits1(&s->gb)) {
1788 v = get_bits(&s->gb, 8);
1789 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1790 s->intra_matrix[j] = v;
1791 s->chroma_intra_matrix[j] = v;
1794 if (get_bits1(&s->gb)) {
1796 v = get_bits(&s->gb, 8);
1797 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1798 s->inter_matrix[j] = v;
1799 s->chroma_inter_matrix[j] = v;
1802 if (get_bits1(&s->gb)) {
1804 v = get_bits(&s->gb, 8);
1805 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1806 s->chroma_intra_matrix[j] = v;
1809 if (get_bits1(&s->gb)) {
1811 v = get_bits(&s->gb, 8);
1812 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1813 s->chroma_inter_matrix[j] = v;
1818 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1820 s->full_pel[0] = s->full_pel[1] = 0;
1821 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1822 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1823 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1824 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1825 s->intra_dc_precision = get_bits(&s->gb, 2);
1826 s->picture_structure = get_bits(&s->gb, 2);
1827 s->top_field_first = get_bits1(&s->gb);
1828 s->frame_pred_frame_dct = get_bits1(&s->gb);
1829 s->concealment_motion_vectors = get_bits1(&s->gb);
1830 s->q_scale_type = get_bits1(&s->gb);
1831 s->intra_vlc_format = get_bits1(&s->gb);
1832 s->alternate_scan = get_bits1(&s->gb);
1833 s->repeat_first_field = get_bits1(&s->gb);
1834 s->chroma_420_type = get_bits1(&s->gb);
1835 s->progressive_frame = get_bits1(&s->gb);
1837 if(s->picture_structure == PICT_FRAME)
1840 s->first_field ^= 1;
1841 memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1844 if(s->alternate_scan){
1845 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
1846 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
1847 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
1848 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
1850 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
1851 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
1852 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
1853 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
1856 /* composite display not parsed */
1857 dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
1858 dprintf("picture_structure=%d\n", s->picture_structure);
1859 dprintf("top field first=%d\n", s->top_field_first);
1860 dprintf("repeat first field=%d\n", s->repeat_first_field);
1861 dprintf("conceal=%d\n", s->concealment_motion_vectors);
1862 dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
1863 dprintf("alternate_scan=%d\n", s->alternate_scan);
1864 dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1865 dprintf("progressive_frame=%d\n", s->progressive_frame);
1868 static void mpeg_decode_extension(AVCodecContext *avctx,
1869 uint8_t *buf, int buf_size)
1871 Mpeg1Context *s1 = avctx->priv_data;
1872 MpegEncContext *s = &s1->mpeg_enc_ctx;
1875 init_get_bits(&s->gb, buf, buf_size*8);
1877 ext_type = get_bits(&s->gb, 4);
1881 mpeg_decode_sequence_extension(s);
1884 /* quant matrix extension */
1885 mpeg_decode_quant_matrix_extension(s);
1888 /* picture extension */
1889 mpeg_decode_picture_coding_extension(s);
1894 static void exchange_uv(AVFrame *f){
1895 uint8_t *t= f->data[1];
1896 f->data[1]= f->data[2];
1900 #define DECODE_SLICE_FATAL_ERROR -2
1901 #define DECODE_SLICE_ERROR -1
1902 #define DECODE_SLICE_OK 0
1906 * @return DECODE_SLICE_FATAL_ERROR if a non recoverable error occured<br>
1907 * DECODE_SLICE_ERROR if the slice is damaged<br>
1908 * DECODE_SLICE_OK if this slice is ok<br>
1910 static int mpeg_decode_slice(AVCodecContext *avctx,
1913 uint8_t **buf, int buf_size)
1915 Mpeg1Context *s1 = avctx->priv_data;
1916 MpegEncContext *s = &s1->mpeg_enc_ctx;
1918 const int field_pic= s->picture_structure != PICT_FRAME;
1920 s->resync_mb_x= s->mb_x =
1921 s->resync_mb_y= s->mb_y = -1;
1923 start_code = (start_code - 1) & 0xff;
1924 if (start_code >= s->mb_height){
1925 fprintf(stderr, "slice below image (%d >= %d)\n", start_code, s->mb_height);
1929 ff_mpeg1_clean_buffers(s);
1930 s->interlaced_dct = 0;
1932 /* start frame decoding */
1933 if (s->first_slice) {
1934 if(s->first_field || s->picture_structure==PICT_FRAME){
1935 if(MPV_frame_start(s, avctx) < 0)
1936 return DECODE_SLICE_FATAL_ERROR;
1938 ff_er_frame_start(s);
1940 /* first check if we must repeat the frame */
1941 s->current_picture_ptr->repeat_pict = 0;
1942 if (s->repeat_first_field) {
1943 if (s->progressive_sequence) {
1944 if (s->top_field_first)
1945 s->current_picture_ptr->repeat_pict = 4;
1947 s->current_picture_ptr->repeat_pict = 2;
1948 } else if (s->progressive_frame) {
1949 s->current_picture_ptr->repeat_pict = 1;
1952 //printf("%d\n", s->current_picture_ptr->repeat_pict);
1954 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1955 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",
1956 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],
1957 s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
1958 s->progressive_sequence ? "pro" :"", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1959 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1960 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1962 }else{ //second field
1965 if(!s->current_picture_ptr){
1966 fprintf(stderr, "first field missing\n");
1971 s->current_picture.data[i] = s->current_picture_ptr->data[i];
1972 if(s->picture_structure == PICT_BOTTOM_FIELD){
1973 s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1978 // MPV_frame_start will call this function too,
1979 // but we need to call it on every field
1980 if(s->avctx->xvmc_acceleration)
1981 XVMC_field_start(s,avctx);
1983 }//fi(s->first_slice)
1986 init_get_bits(&s->gb, *buf, buf_size*8);
1988 s->qscale = get_qscale(s);
1990 fprintf(stderr, "qscale == 0\n");
1994 /* extra slice info */
1995 while (get_bits1(&s->gb) != 0) {
1996 skip_bits(&s->gb, 8);
2002 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2004 fprintf(stderr, "first mb_incr damaged\n");
2011 /* otherwise, stuffing, nothing to do */
2018 s->resync_mb_x= s->mb_x;
2019 s->resync_mb_y= s->mb_y = start_code;
2021 ff_init_block_index(s);
2024 s->dsp.clear_blocks(s->block[0]);
2026 ret = mpeg_decode_mb(s, s->block);
2028 dprintf("ret=%d\n", ret);
2032 if(s->motion_val && s->pict_type != B_TYPE){ //note motion_val is normally NULL unless we want to extract the MVs
2033 const int wrap = s->block_wrap[0];
2034 const int xy = s->mb_x*2 + 1 + (s->mb_y*2 +1)*wrap;
2035 int motion_x, motion_y;
2038 motion_x = motion_y = 0;
2039 }else if (s->mv_type == MV_TYPE_16X16) {
2040 motion_x = s->mv[0][0][0];
2041 motion_y = s->mv[0][0][1];
2042 } else /*if (s->mv_type == MV_TYPE_FIELD)*/ {
2043 motion_x = s->mv[0][0][0] + s->mv[0][1][0];
2044 motion_y = s->mv[0][0][1] + s->mv[0][1][1];
2045 motion_x = (motion_x>>1) | (motion_x&1);
2047 s->motion_val[xy][0] = motion_x;
2048 s->motion_val[xy][1] = motion_y;
2049 s->motion_val[xy + 1][0] = motion_x;
2050 s->motion_val[xy + 1][1] = motion_y;
2051 s->motion_val[xy + wrap][0] = motion_x;
2052 s->motion_val[xy + wrap][1] = motion_y;
2053 s->motion_val[xy + 1 + wrap][0] = motion_x;
2054 s->motion_val[xy + 1 + wrap][1] = motion_y;
2061 MPV_decode_mb(s, s->block);
2063 if (++s->mb_x >= s->mb_width) {
2064 if(s->avctx->codec_tag == ff_get_fourcc("VCR2"))
2065 exchange_uv((AVFrame*)s->current_picture_ptr);
2067 ff_draw_horiz_band(s, 16*s->mb_y, 16);
2069 if(s->avctx->codec_tag == ff_get_fourcc("VCR2"))
2070 exchange_uv((AVFrame*)s->current_picture_ptr);
2075 if(s->mb_y<<field_pic >= s->mb_height){
2076 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2078 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)))
2079 || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2080 fprintf(stderr, "end missmatch left=%d\n", left);
2086 ff_init_block_index(s);
2089 /* skip mb handling */
2090 if (s->mb_skip_run == -1) {
2091 /* read again increment */
2094 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2096 fprintf(stderr, "mb incr damaged\n");
2101 s->mb_skip_run += 33;
2102 }else if(code == 35){
2103 if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2104 fprintf(stderr, "slice missmatch\n");
2107 goto eos; /* end of slice */
2109 /* otherwise, stuffing, nothing to do */
2111 s->mb_skip_run += code;
2117 eos: // end of slice
2118 *buf += get_bits_count(&s->gb)/8 - 1;
2119 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2124 * handles slice ends.
2125 * @return 1 if it seems to be the last slice of
2127 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2129 Mpeg1Context *s1 = avctx->priv_data;
2130 MpegEncContext *s = &s1->mpeg_enc_ctx;
2132 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2136 if(s->avctx->xvmc_acceleration)
2139 /* end of slice reached */
2140 if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2143 if(s->codec_id == CODEC_ID_MPEG2VIDEO){
2144 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2146 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG1;
2152 if (s->pict_type == B_TYPE || s->low_delay) {
2153 *pict= *(AVFrame*)s->current_picture_ptr;
2154 ff_print_debug_info(s, s->current_picture_ptr);
2156 s->picture_number++;
2157 /* latency of 1 frame for I and P frames */
2158 /* XXX: use another variable than picture_number */
2159 if (s->last_picture_ptr != NULL) {
2160 *pict= *(AVFrame*)s->last_picture_ptr;
2161 ff_print_debug_info(s, s->last_picture_ptr);
2164 if(s->avctx->codec_tag == ff_get_fourcc("VCR2"))
2173 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2174 uint8_t *buf, int buf_size)
2176 Mpeg1Context *s1 = avctx->priv_data;
2177 MpegEncContext *s = &s1->mpeg_enc_ctx;
2178 int width, height, i, v, j;
2181 init_get_bits(&s->gb, buf, buf_size*8);
2183 width = get_bits(&s->gb, 12);
2184 height = get_bits(&s->gb, 12);
2185 s->aspect_ratio_info= get_bits(&s->gb, 4);
2186 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
2187 aspect= mpeg1_aspect[s->aspect_ratio_info];
2188 if(aspect!=0.0) avctx->aspect_ratio= width/(aspect*height);
2191 s->frame_rate_index = get_bits(&s->gb, 4);
2192 if (s->frame_rate_index == 0)
2194 s->bit_rate = get_bits(&s->gb, 18) * 400;
2195 if (get_bits1(&s->gb) == 0) /* marker */
2197 if (width <= 0 || height <= 0 ||
2198 (width % 2) != 0 || (height % 2) != 0)
2200 if (width != s->width ||
2201 height != s->height) {
2202 /* start new mpeg1 context decoding */
2203 s->out_format = FMT_MPEG1;
2204 if (s1->mpeg_enc_ctx_allocated) {
2209 avctx->has_b_frames= 1;
2211 avctx->width = width;
2212 avctx->height = height;
2215 &avctx->frame_rate_base,
2216 frame_rate_tab[s->frame_rate_index],
2217 MPEG1_FRAME_RATE_BASE, //FIXME store in allready reduced form
2220 avctx->bit_rate = s->bit_rate;
2222 //get_format() or set_video(width,height,aspect,pix_fmt);
2223 //until then pix_fmt may be changed right after codec init
2224 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2225 avctx->idct_algo = FF_IDCT_SIMPLE;
2227 if (MPV_common_init(s) < 0)
2229 s1->mpeg_enc_ctx_allocated = 1;
2232 skip_bits(&s->gb, 10); /* vbv_buffer_size */
2233 skip_bits(&s->gb, 1);
2236 if (get_bits1(&s->gb)) {
2238 v = get_bits(&s->gb, 8);
2239 j = s->intra_scantable.permutated[i];
2240 s->intra_matrix[j] = v;
2241 s->chroma_intra_matrix[j] = v;
2244 dprintf("intra matrix present\n");
2246 dprintf(" %d", s->intra_matrix[s->intra_scantable.permutated[i]]);
2251 int j= s->dsp.idct_permutation[i];
2252 v = ff_mpeg1_default_intra_matrix[i];
2253 s->intra_matrix[j] = v;
2254 s->chroma_intra_matrix[j] = v;
2257 if (get_bits1(&s->gb)) {
2259 v = get_bits(&s->gb, 8);
2260 j = s->intra_scantable.permutated[i];
2261 s->inter_matrix[j] = v;
2262 s->chroma_inter_matrix[j] = v;
2265 dprintf("non intra matrix present\n");
2267 dprintf(" %d", s->inter_matrix[s->intra_scantable.permutated[i]]);
2272 int j= s->dsp.idct_permutation[i];
2273 v = ff_mpeg1_default_non_intra_matrix[i];
2274 s->inter_matrix[j] = v;
2275 s->chroma_inter_matrix[j] = v;
2279 /* we set mpeg2 parameters so that it emulates mpeg1 */
2280 s->progressive_sequence = 1;
2281 s->progressive_frame = 1;
2282 s->picture_structure = PICT_FRAME;
2283 s->frame_pred_frame_dct = 1;
2284 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2285 avctx->sub_id = 1; /* indicates mpeg1 */
2289 static int vcr2_init_sequence(AVCodecContext *avctx)
2291 Mpeg1Context *s1 = avctx->priv_data;
2292 MpegEncContext *s = &s1->mpeg_enc_ctx;
2295 /* start new mpeg1 context decoding */
2296 s->out_format = FMT_MPEG1;
2297 if (s1->mpeg_enc_ctx_allocated) {
2300 s->width = avctx->width;
2301 s->height = avctx->height;
2302 avctx->has_b_frames= 0; //true?
2306 //get_format() or set_video(width,height,aspect,pix_fmt);
2307 //until then pix_fmt may be changed right after codec init
2308 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2309 avctx->idct_algo = FF_IDCT_SIMPLE;
2311 if (MPV_common_init(s) < 0)
2313 s1->mpeg_enc_ctx_allocated = 1;
2316 int j= s->dsp.idct_permutation[i];
2317 v = ff_mpeg1_default_intra_matrix[i];
2318 s->intra_matrix[j] = v;
2319 s->chroma_intra_matrix[j] = v;
2321 v = ff_mpeg1_default_non_intra_matrix[i];
2322 s->inter_matrix[j] = v;
2323 s->chroma_inter_matrix[j] = v;
2326 s->progressive_sequence = 1;
2327 s->progressive_frame = 1;
2328 s->picture_structure = PICT_FRAME;
2329 s->frame_pred_frame_dct = 1;
2330 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2331 avctx->sub_id = 2; /* indicates mpeg2 */
2336 static void mpeg_decode_user_data(AVCodecContext *avctx,
2337 const uint8_t *buf, int buf_size)
2344 /* we parse the DTG active format information */
2346 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2360 avctx->dtg_active_format = p[0] & 0x0f;
2366 * finds the end of the current frame in the bitstream.
2367 * @return the position of the first byte of the next frame, or -1
2369 static int mpeg1_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
2370 ParseContext *pc= &s->parse_context;
2377 if(!pc->frame_start_found){
2378 for(i=0; i<buf_size; i++){
2379 state= (state<<8) | buf[i];
2380 if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2382 pc->frame_start_found=1;
2388 if(pc->frame_start_found){
2389 for(; i<buf_size; i++){
2390 state= (state<<8) | buf[i];
2391 if((state&0xFFFFFF00) == 0x100){
2392 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2393 pc->frame_start_found=0;
2401 return END_NOT_FOUND;
2404 /* handle buffering and image synchronisation */
2405 static int mpeg_decode_frame(AVCodecContext *avctx,
2406 void *data, int *data_size,
2407 uint8_t *buf, int buf_size)
2409 Mpeg1Context *s = avctx->priv_data;
2410 uint8_t *buf_end, *buf_ptr;
2411 int ret, start_code, input_size;
2412 AVFrame *picture = data;
2413 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2414 dprintf("fill_buffer\n");
2418 /* special case for last picture */
2419 if (buf_size == 0 && s2->low_delay==0 && s2->next_picture_ptr) {
2420 *picture= *(AVFrame*)s2->next_picture_ptr;
2421 s2->next_picture_ptr= NULL;
2423 *data_size = sizeof(AVFrame);
2427 if(s2->flags&CODEC_FLAG_TRUNCATED){
2428 int next= mpeg1_find_frame_end(s2, buf, buf_size);
2430 if( ff_combine_frame(s2, next, &buf, &buf_size) < 0 )
2435 buf_end = buf + buf_size;
2438 if (s->repeat_field % 2 == 1) {
2440 //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2441 // s2->picture_number, s->repeat_field);
2442 if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2443 *data_size = sizeof(AVPicture);
2449 if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2450 vcr2_init_sequence(avctx);
2453 /* find start next code */
2454 start_code = find_start_code(&buf_ptr, buf_end);
2455 if (start_code < 0){
2456 if(s2->pict_type != B_TYPE || avctx->hurry_up==0){
2457 if (slice_end(avctx, picture)) {
2458 if(s2->last_picture_ptr) //FIXME merge with the stuff in mpeg_decode_slice
2459 *data_size = sizeof(AVPicture);
2462 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2465 input_size = buf_end - buf_ptr;
2467 if(avctx->debug & FF_DEBUG_STARTCODE){
2468 printf("%3X at %d left %d\n", start_code, buf_ptr-buf, input_size);
2471 /* prepare data for next start code */
2472 switch(start_code) {
2473 case SEQ_START_CODE:
2474 mpeg1_decode_sequence(avctx, buf_ptr,
2478 case PICTURE_START_CODE:
2479 /* we have a complete image : we try to decompress it */
2480 mpeg1_decode_picture(avctx,
2481 buf_ptr, input_size);
2483 case EXT_START_CODE:
2484 mpeg_decode_extension(avctx,
2485 buf_ptr, input_size);
2487 case USER_START_CODE:
2488 mpeg_decode_user_data(avctx,
2489 buf_ptr, input_size);
2491 case GOP_START_CODE:
2495 if (start_code >= SLICE_MIN_START_CODE &&
2496 start_code <= SLICE_MAX_START_CODE) {
2498 /* skip b frames if we dont have reference frames */
2499 if(s2->last_picture_ptr==NULL && s2->pict_type==B_TYPE) break;
2500 /* skip b frames if we are in a hurry */
2501 if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2502 /* skip everything if we are in a hurry>=5 */
2503 if(avctx->hurry_up>=5) break;
2505 if (!s->mpeg_enc_ctx_allocated) break;
2507 ret = mpeg_decode_slice(avctx, picture,
2508 start_code, &buf_ptr, input_size);
2512 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2513 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);
2514 if(ret==DECODE_SLICE_FATAL_ERROR) return -1;
2516 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);
2524 static int mpeg_decode_end(AVCodecContext *avctx)
2526 Mpeg1Context *s = avctx->priv_data;
2528 if (s->mpeg_enc_ctx_allocated)
2529 MPV_common_end(&s->mpeg_enc_ctx);
2533 AVCodec mpeg1video_decoder = {
2536 CODEC_ID_MPEG1VIDEO,
2537 sizeof(Mpeg1Context),
2542 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2543 .flush= ff_mpeg_flush,
2546 AVCodec mpeg2video_decoder = {
2549 CODEC_ID_MPEG2VIDEO,
2550 sizeof(Mpeg1Context),
2555 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2556 .flush= ff_mpeg_flush,
2560 static int mpeg_mc_decode_init(AVCodecContext *avctx){
2563 if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2565 if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) )
2566 dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2568 mpeg_decode_init(avctx);
2569 s = avctx->priv_data;
2571 avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2572 avctx->xvmc_acceleration = 1;
2577 AVCodec mpeg_xvmc_decoder = {
2580 CODEC_ID_MPEG2VIDEO_XVMC,
2581 sizeof(Mpeg1Context),
2582 mpeg_mc_decode_init,
2586 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2591 /* this is ugly i know, but the alternative is too make
2592 hundreds of vars global and prefix them with ff_mpeg1_
2593 which is far uglier. */