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;
193 if(aspect_ratio==0.0) aspect_ratio= s->width / (float)s->height; //pixel aspect 1:1 (VGA)
195 if (s->current_picture.key_frame) {
196 /* mpeg1 header repeated every gop */
197 put_header(s, SEQ_START_CODE);
199 /* search closest frame rate */
202 s->frame_rate_index = 0;
205 if(s->avctx->strict_std_compliance >= 0 && i>=9) break;
207 d = abs(MPEG1_FRAME_RATE_BASE*(int64_t)s->avctx->frame_rate/s->avctx->frame_rate_base - frame_rate_tab[i]);
210 s->frame_rate_index = i;
215 put_bits(&s->pb, 12, s->width);
216 put_bits(&s->pb, 12, s->height);
219 float error= mpeg1_aspect[i] - s->width/(s->height*aspect_ratio);
222 if(error < best_aspect_error){
223 best_aspect_error= error;
224 s->aspect_ratio_info= i;
228 put_bits(&s->pb, 4, s->aspect_ratio_info);
229 put_bits(&s->pb, 4, s->frame_rate_index);
231 if(s->avctx->rc_max_rate){
232 v = (s->avctx->rc_max_rate + 399) / 400;
233 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
239 if(s->avctx->rc_buffer_size)
240 vbv_buffer_size = s->avctx->rc_buffer_size;
242 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
243 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
244 vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
246 put_bits(&s->pb, 18, v & 0x3FFFF);
247 put_bits(&s->pb, 1, 1); /* marker */
248 put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
249 put_bits(&s->pb, 1, 1); /* constrained parameter flag */
251 ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
252 ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
254 if(s->codec_id == CODEC_ID_MPEG2VIDEO){
255 put_header(s, EXT_START_CODE);
256 put_bits(&s->pb, 4, 1); //seq ext
257 put_bits(&s->pb, 1, 0); //esc
258 put_bits(&s->pb, 3, 4); //profile
259 put_bits(&s->pb, 4, 8); //level
260 put_bits(&s->pb, 1, s->progressive_sequence=1);
261 put_bits(&s->pb, 2, 1); //chroma format 4:2:0
262 put_bits(&s->pb, 2, 0); //horizontal size ext
263 put_bits(&s->pb, 2, 0); //vertical size ext
264 put_bits(&s->pb, 12, v>>18); //bitrate ext
265 put_bits(&s->pb, 1, 1); //marker
266 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
267 put_bits(&s->pb, 1, s->low_delay);
268 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
269 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
272 put_header(s, GOP_START_CODE);
273 put_bits(&s->pb, 1, 0); /* do drop frame */
274 /* time code : we must convert from the real frame rate to a
275 fake mpeg frame rate in case of low frame rate */
276 fps = frame_rate_tab[s->frame_rate_index];
277 time_code = (int64_t)s->fake_picture_number * MPEG1_FRAME_RATE_BASE;
278 s->gop_picture_number = s->fake_picture_number;
279 put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
280 put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
281 put_bits(&s->pb, 1, 1);
282 put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
283 put_bits(&s->pb, 6, (uint32_t)((time_code % fps) / MPEG1_FRAME_RATE_BASE));
284 put_bits(&s->pb, 1, 0); /* closed gop */
285 put_bits(&s->pb, 1, 0); /* broken link */
288 if (s->avctx->frame_rate < (24 * s->avctx->frame_rate_base) && s->picture_number > 0) {
289 /* insert empty P pictures to slow down to the desired
290 frame rate. Each fake pictures takes about 20 bytes */
291 fps = frame_rate_tab[s->frame_rate_index];
292 n = av_rescale((int64_t)s->picture_number * s->avctx->frame_rate_base, fps, s->avctx->frame_rate) / MPEG1_FRAME_RATE_BASE - 1;
293 while (s->fake_picture_number < n) {
294 mpeg1_skip_picture(s, s->fake_picture_number -
295 s->gop_picture_number);
296 s->fake_picture_number++;
302 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
304 put_bits(&s->pb, 11, 0x008);
307 put_bits(&s->pb, mbAddrIncrTable[run][1],
308 mbAddrIncrTable[run][0]);
311 /* insert a fake P picture */
312 static void mpeg1_skip_picture(MpegEncContext *s, int pict_num)
314 assert(s->codec_id == CODEC_ID_MPEG1VIDEO); // mpeg2 can do these repeat things
316 /* mpeg1 picture header */
317 put_header(s, PICTURE_START_CODE);
318 /* temporal reference */
319 put_bits(&s->pb, 10, pict_num & 0x3ff);
321 put_bits(&s->pb, 3, P_TYPE);
322 put_bits(&s->pb, 16, 0xffff); /* non constant bit rate */
324 put_bits(&s->pb, 1, 1); /* integer coordinates */
325 put_bits(&s->pb, 3, 1); /* forward_f_code */
327 put_bits(&s->pb, 1, 0); /* extra bit picture */
330 put_header(s, SLICE_MIN_START_CODE);
331 put_bits(&s->pb, 5, 1); /* quantizer scale */
332 put_bits(&s->pb, 1, 0); /* slice extra information */
334 encode_mb_skip_run(s, 0);
336 /* empty macroblock */
337 put_bits(&s->pb, 3, 1); /* motion only */
339 /* zero motion x & y */
340 put_bits(&s->pb, 1, 1);
341 put_bits(&s->pb, 1, 1);
343 /* output a number of empty slice */
344 encode_mb_skip_run(s, s->mb_width * s->mb_height - 2);
346 /* empty macroblock */
347 put_bits(&s->pb, 3, 1); /* motion only */
349 /* zero motion x & y */
350 put_bits(&s->pb, 1, 1);
351 put_bits(&s->pb, 1, 1);
355 static void common_init(MpegEncContext *s)
358 s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
361 void ff_mpeg1_clean_buffers(MpegEncContext *s){
362 s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
363 s->last_dc[1] = s->last_dc[0];
364 s->last_dc[2] = s->last_dc[0];
365 memset(s->last_mv, 0, sizeof(s->last_mv));
368 #ifdef CONFIG_ENCODERS
370 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
371 put_header(s, SLICE_MIN_START_CODE + s->mb_y);
372 put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
373 put_bits(&s->pb, 1, 0); /* slice extra information */
376 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
378 mpeg1_encode_sequence_header(s);
380 /* mpeg1 picture header */
381 put_header(s, PICTURE_START_CODE);
382 /* temporal reference */
384 // RAL: s->picture_number instead of s->fake_picture_number
385 put_bits(&s->pb, 10, (s->picture_number -
386 s->gop_picture_number) & 0x3ff);
387 s->fake_picture_number++;
389 put_bits(&s->pb, 3, s->pict_type);
390 put_bits(&s->pb, 16, 0xffff); /* non constant bit rate */
392 // RAL: Forward f_code also needed for B frames
393 if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
394 put_bits(&s->pb, 1, 0); /* half pel coordinates */
395 put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
398 // RAL: Backward f_code necessary for B frames
399 if (s->pict_type == B_TYPE) {
400 put_bits(&s->pb, 1, 0); /* half pel coordinates */
401 put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
404 put_bits(&s->pb, 1, 0); /* extra bit picture */
406 if(s->codec_id == CODEC_ID_MPEG2VIDEO){
407 put_header(s, EXT_START_CODE);
408 put_bits(&s->pb, 4, 8); //pic ext
409 put_bits(&s->pb, 4, s->f_code);
410 put_bits(&s->pb, 4, s->f_code);
411 put_bits(&s->pb, 4, s->b_code);
412 put_bits(&s->pb, 4, s->b_code);
413 put_bits(&s->pb, 2, s->intra_dc_precision);
414 put_bits(&s->pb, 2, s->picture_structure= PICT_FRAME);
415 put_bits(&s->pb, 1, s->top_field_first);
416 put_bits(&s->pb, 1, s->frame_pred_frame_dct= 1);
417 put_bits(&s->pb, 1, s->concealment_motion_vectors);
418 put_bits(&s->pb, 1, s->q_scale_type);
419 put_bits(&s->pb, 1, s->intra_vlc_format);
420 put_bits(&s->pb, 1, s->alternate_scan);
421 put_bits(&s->pb, 1, s->repeat_first_field);
422 put_bits(&s->pb, 1, s->chroma_420_type=1);
423 put_bits(&s->pb, 1, s->progressive_frame=1);
424 put_bits(&s->pb, 1, 0); //composite_display_flag
428 ff_mpeg1_encode_slice_header(s);
431 void mpeg1_encode_mb(MpegEncContext *s,
432 DCTELEM block[6][64],
433 int motion_x, int motion_y)
436 const int mb_x = s->mb_x;
437 const int mb_y = s->mb_y;
438 const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
443 if (s->block_last_index[i] >= 0)
447 if (cbp == 0 && !first_mb && (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
448 ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
449 (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) |
450 ((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))) {
452 s->qscale -= s->dquant;
458 assert(s->mb_skip_run == 0);
459 encode_mb_skip_run(s, s->mb_x);
461 encode_mb_skip_run(s, s->mb_skip_run);
464 if (s->pict_type == I_TYPE) {
465 if(s->dquant && cbp){
466 put_bits(&s->pb, 2, 1); /* macroblock_type : macroblock_quant = 1 */
467 put_bits(&s->pb, 5, s->qscale);
469 put_bits(&s->pb, 1, 1); /* macroblock_type : macroblock_quant = 0 */
470 s->qscale -= s->dquant;
472 s->misc_bits+= get_bits_diff(s);
474 } else if (s->mb_intra) {
475 if(s->dquant && cbp){
476 put_bits(&s->pb, 6, 0x01);
477 put_bits(&s->pb, 5, s->qscale);
479 put_bits(&s->pb, 5, 0x03);
480 s->qscale -= s->dquant;
482 s->misc_bits+= get_bits_diff(s);
484 s->last_mv[0][0][0] =
485 s->last_mv[0][0][1] = 0;
486 } else if (s->pict_type == P_TYPE) {
488 if (motion_x == 0 && motion_y == 0) {
490 put_bits(&s->pb, 5, 1); /* macroblock_pattern & quant */
491 put_bits(&s->pb, 5, s->qscale);
493 put_bits(&s->pb, 2, 1); /* macroblock_pattern only */
495 s->misc_bits+= get_bits_diff(s);
496 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
499 put_bits(&s->pb, 5, 2); /* motion + cbp */
500 put_bits(&s->pb, 5, s->qscale);
502 put_bits(&s->pb, 1, 1); /* motion + cbp */
504 s->misc_bits+= get_bits_diff(s);
505 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added
506 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added
507 s->mv_bits+= get_bits_diff(s);
508 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
511 put_bits(&s->pb, 3, 1); /* motion only */
512 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added
513 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added
514 s->qscale -= s->dquant;
515 s->mv_bits+= get_bits_diff(s);
519 { // RAL: All the following bloc added for B frames:
521 { // With coded bloc pattern
522 if (s->mv_dir == (MV_DIR_FORWARD | MV_DIR_BACKWARD))
523 { // Bi-directional motion
526 put_bits(&s->pb, 5, 2);
527 put_bits(&s->pb, 5, s->qscale);
529 else // Without QScale
530 put_bits(&s->pb, 2, 3);
531 s->misc_bits += get_bits_diff(s);
532 mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
533 mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
534 mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
535 mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
538 s->mv_bits += get_bits_diff(s);
539 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
541 else if (s->mv_dir == MV_DIR_BACKWARD)
545 put_bits(&s->pb, 6, 2);
546 put_bits(&s->pb, 5, s->qscale);
548 else // Without QScale
549 put_bits(&s->pb, 3, 3);
550 s->misc_bits += get_bits_diff(s);
551 mpeg1_encode_motion(s, motion_x - s->last_mv[1][0][0], s->b_code);
552 mpeg1_encode_motion(s, motion_y - s->last_mv[1][0][1], s->b_code);
554 s->mv_bits += get_bits_diff(s);
555 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
557 else if (s->mv_dir == MV_DIR_FORWARD)
561 put_bits(&s->pb, 6, 3);
562 put_bits(&s->pb, 5, s->qscale);
564 else // Without QScale
565 put_bits(&s->pb, 4, 3);
566 s->misc_bits += get_bits_diff(s);
567 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);
568 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);
570 s->mv_bits += get_bits_diff(s);
571 put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
575 { // No coded bloc pattern
576 if (s->mv_dir == (MV_DIR_FORWARD | MV_DIR_BACKWARD))
577 { // Bi-directional motion
578 put_bits(&s->pb, 2, 2); /* backward & forward motion */
579 mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
580 mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
581 mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
582 mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
586 else if (s->mv_dir == MV_DIR_BACKWARD)
588 put_bits(&s->pb, 3, 2); /* backward motion only */
589 mpeg1_encode_motion(s, motion_x - s->last_mv[1][0][0], s->b_code);
590 mpeg1_encode_motion(s, motion_y - s->last_mv[1][0][1], s->b_code);
593 else if (s->mv_dir == MV_DIR_FORWARD)
595 put_bits(&s->pb, 4, 2); /* forward motion only */
596 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);
597 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);
600 s->qscale -= s->dquant;
601 s->mv_bits += get_bits_diff(s);
603 // End of bloc from RAL
606 if (cbp & (1 << (5 - i))) {
607 mpeg1_encode_block(s, block[i], i);
612 s->i_tex_bits+= get_bits_diff(s);
614 s->p_tex_bits+= get_bits_diff(s);
618 if (s->mv_dir & MV_DIR_FORWARD)
620 s->last_mv[0][0][0]= s->mv[0][0][0];
621 s->last_mv[0][0][1]= s->mv[0][0][1];
623 if (s->mv_dir & MV_DIR_BACKWARD)
625 s->last_mv[1][0][0]= s->mv[1][0][0];
626 s->last_mv[1][0][1]= s->mv[1][0][1];
630 // RAL: Parameter added: f_or_b_code
631 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
633 int code, bit_size, l, m, bits, range, sign;
639 mbMotionVectorTable[0][1],
640 mbMotionVectorTable[0][0]);
642 bit_size = f_or_b_code - 1;
643 range = 1 << bit_size;
644 /* modulo encoding */
649 } else if (val >= l) {
655 code = (val >> bit_size) + 1;
656 bits = val & (range - 1);
661 code = (val >> bit_size) + 1;
662 bits = val & (range - 1);
666 assert(code > 0 && code <= 16);
669 mbMotionVectorTable[code][1],
670 mbMotionVectorTable[code][0]);
672 put_bits(&s->pb, 1, sign);
674 put_bits(&s->pb, bit_size, bits);
679 void ff_mpeg1_encode_init(MpegEncContext *s)
695 mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
696 mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
699 init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_bits, uni_mpeg1_ac_vlc_len);
701 /* build unified dc encoding tables */
702 for(i=-255; i<256; i++)
710 index = vlc_dc_table[adiff];
712 bits= vlc_dc_lum_bits[index] + index;
713 code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
714 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
716 bits= vlc_dc_chroma_bits[index] + index;
717 code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
718 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
721 mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
723 for(f_code=1; f_code<=MAX_FCODE; f_code++){
724 for(mv=-MAX_MV; mv<=MAX_MV; mv++){
727 if(mv==0) len= mbMotionVectorTable[0][1];
729 int val, bit_size, range, code;
731 bit_size = s->f_code - 1;
732 range = 1 << bit_size;
738 code = (val >> bit_size) + 1;
740 len= mbMotionVectorTable[code][1] + 1 + bit_size;
742 len= mbMotionVectorTable[16][1] + 2 + bit_size;
746 mv_penalty[f_code][mv+MAX_MV]= len;
751 for(f_code=MAX_FCODE; f_code>0; f_code--){
752 for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
753 fcode_tab[mv+MAX_MV]= f_code;
757 s->me.mv_penalty= mv_penalty;
758 s->fcode_tab= fcode_tab;
759 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
766 s->intra_ac_vlc_length=
767 s->inter_ac_vlc_length= uni_mpeg1_ac_vlc_len;
770 static inline void encode_dc(MpegEncContext *s, int diff, int component)
772 if (component == 0) {
775 mpeg1_lum_dc_uni[diff+255]&0xFF,
776 mpeg1_lum_dc_uni[diff+255]>>8);
780 mpeg1_chr_dc_uni[diff+255]&0xFF,
781 mpeg1_chr_dc_uni[diff+255]>>8);
785 static void mpeg1_encode_block(MpegEncContext *s,
789 int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
791 // RLTable *rl = &rl_mpeg1;
793 last_index = s->block_last_index[n];
797 component = (n <= 3 ? 0 : n - 4 + 1);
798 dc = block[0]; /* overflow is impossible */
799 diff = dc - s->last_dc[component];
800 encode_dc(s, diff, component);
801 s->last_dc[component] = dc;
804 if (s->intra_vlc_format)
810 /* encode the first coefficient : needs to be done here because
811 it is handled slightly differently */
813 if (abs(level) == 1) {
814 code = ((uint32_t)level >> 31); /* the sign bit */
815 put_bits(&s->pb, 2, code | 0x02);
824 /* now quantify & encode AC coefs */
825 last_non_zero = i - 1;
827 for(;i<=last_index;i++) {
828 j = s->intra_scantable.permutated[i];
833 dprintf("level[%d]=%d\n", i, level);
835 /* encode using VLC */
837 run = i - last_non_zero - 1;
840 MASK_ABS(sign, alevel)
843 // code = get_rl_index(rl, 0, run, alevel);
844 if (alevel <= mpeg1_max_level[0][run]){
845 code= mpeg1_index_run[0][run] + alevel - 1;
846 /* store the vlc & sign at once */
847 put_bits(&s->pb, mpeg1_vlc[code][1]+1, (mpeg1_vlc[code][0]<<1) + sign);
849 /* escape seems to be pretty rare <5% so i dont optimize it */
850 put_bits(&s->pb, mpeg1_vlc[111/*rl->n*/][1], mpeg1_vlc[111/*rl->n*/][0]);
851 /* escape: only clip in this case */
852 put_bits(&s->pb, 6, run);
853 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
855 put_bits(&s->pb, 8, level & 0xff);
858 put_bits(&s->pb, 16, 0x8001 + level + 255);
860 put_bits(&s->pb, 16, level & 0xffff);
864 put_bits(&s->pb, 12, level & 0xfff);
871 put_bits(&s->pb, 2, 0x2);
873 #endif //CONFIG_ENCODERS
875 /******************************************/
878 static VLC dc_lum_vlc;
879 static VLC dc_chroma_vlc;
881 static VLC mbincr_vlc;
882 static VLC mb_ptype_vlc;
883 static VLC mb_btype_vlc;
884 static VLC mb_pat_vlc;
886 static void init_vlcs()
893 init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
894 vlc_dc_lum_bits, 1, 1,
895 vlc_dc_lum_code, 2, 2);
896 init_vlc(&dc_chroma_vlc, DC_VLC_BITS, 12,
897 vlc_dc_chroma_bits, 1, 1,
898 vlc_dc_chroma_code, 2, 2);
899 init_vlc(&mv_vlc, MV_VLC_BITS, 17,
900 &mbMotionVectorTable[0][1], 2, 1,
901 &mbMotionVectorTable[0][0], 2, 1);
902 init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
903 &mbAddrIncrTable[0][1], 2, 1,
904 &mbAddrIncrTable[0][0], 2, 1);
905 init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 63,
906 &mbPatTable[0][1], 2, 1,
907 &mbPatTable[0][0], 2, 1);
909 init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
910 &table_mb_ptype[0][1], 2, 1,
911 &table_mb_ptype[0][0], 2, 1);
912 init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
913 &table_mb_btype[0][1], 2, 1,
914 &table_mb_btype[0][0], 2, 1);
918 init_2d_vlc_rl(&rl_mpeg1);
919 init_2d_vlc_rl(&rl_mpeg2);
923 static inline int get_dmv(MpegEncContext *s)
925 if(get_bits1(&s->gb))
926 return 1 - (get_bits1(&s->gb) << 1);
931 static inline int get_qscale(MpegEncContext *s)
933 int qscale = get_bits(&s->gb, 5);
934 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
935 if (s->q_scale_type) {
936 return non_linear_qscale[qscale];
944 /* motion type (for mpeg2) */
950 static int mpeg_decode_mb(MpegEncContext *s,
951 DCTELEM block[6][64])
953 int i, j, k, cbp, val, mb_type, motion_type;
955 dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
957 assert(s->mb_skiped==0);
959 if (s->mb_skip_run-- != 0) {
960 if(s->pict_type == I_TYPE){
961 fprintf(stderr, "skiped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
968 s->block_last_index[i] = -1;
969 s->mv_type = MV_TYPE_16X16;
970 if (s->pict_type == P_TYPE) {
971 /* if P type, zero motion vector is implied */
972 s->mv_dir = MV_DIR_FORWARD;
973 s->mv[0][0][0] = s->mv[0][0][1] = 0;
974 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
975 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
977 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
979 /* if B type, reuse previous vectors and directions */
980 s->mv[0][0][0] = s->last_mv[0][0][0];
981 s->mv[0][0][1] = s->last_mv[0][0][1];
982 s->mv[1][0][0] = s->last_mv[1][0][0];
983 s->mv[1][0][1] = s->last_mv[1][0][1];
985 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
986 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1] | MB_TYPE_SKIP;
987 // assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
989 if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
996 switch(s->pict_type) {
999 if (get_bits1(&s->gb) == 0) {
1000 if (get_bits1(&s->gb) == 0){
1001 fprintf(stderr, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1004 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1006 mb_type = MB_TYPE_INTRA;
1010 mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1012 fprintf(stderr, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1015 mb_type = ptype2mb_type[ mb_type ];
1018 mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1020 fprintf(stderr, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1023 mb_type = btype2mb_type[ mb_type ];
1026 dprintf("mb_type=%x\n", mb_type);
1027 // motion_type = 0; /* avoid warning */
1028 if (IS_INTRA(mb_type)) {
1029 /* compute dct type */
1030 if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1031 !s->frame_pred_frame_dct) {
1032 s->interlaced_dct = get_bits1(&s->gb);
1035 if (IS_QUANT(mb_type))
1036 s->qscale = get_qscale(s);
1038 if (s->concealment_motion_vectors) {
1039 /* just parse them */
1040 if (s->picture_structure != PICT_FRAME)
1041 skip_bits1(&s->gb); /* field select */
1043 s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
1044 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1045 s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
1046 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1048 skip_bits1(&s->gb); /* marker */
1050 memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1053 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1055 if (mpeg2_decode_block_intra(s, block[i], i) < 0)
1060 if (mpeg1_decode_block_intra(s, block[i], i) < 0)
1065 if (mb_type & MB_TYPE_ZERO_MV){
1066 assert(mb_type & MB_TYPE_PAT);
1068 /* compute dct type */
1069 if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1070 !s->frame_pred_frame_dct) {
1071 s->interlaced_dct = get_bits1(&s->gb);
1074 if (IS_QUANT(mb_type))
1075 s->qscale = get_qscale(s);
1077 s->mv_dir = MV_DIR_FORWARD;
1078 s->mv_type = MV_TYPE_16X16;
1079 s->last_mv[0][0][0] = 0;
1080 s->last_mv[0][0][1] = 0;
1081 s->last_mv[0][1][0] = 0;
1082 s->last_mv[0][1][1] = 0;
1086 assert(mb_type & MB_TYPE_L0L1);
1087 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1088 /* get additionnal motion vector type */
1089 if (s->frame_pred_frame_dct)
1090 motion_type = MT_FRAME;
1092 motion_type = get_bits(&s->gb, 2);
1095 /* compute dct type */
1096 if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1097 !s->frame_pred_frame_dct && IS_PAT(mb_type)) {
1098 s->interlaced_dct = get_bits1(&s->gb);
1101 if (IS_QUANT(mb_type))
1102 s->qscale = get_qscale(s);
1104 /* motion vectors */
1107 if (USES_LIST(mb_type, i)) {
1108 s->mv_dir |= (MV_DIR_FORWARD >> i);
1109 dprintf("motion_type=%d\n", motion_type);
1110 switch(motion_type) {
1111 case MT_FRAME: /* or MT_16X8 */
1112 if (s->picture_structure == PICT_FRAME) {
1114 mb_type |= MB_TYPE_16x16;
1115 s->mv_type = MV_TYPE_16X16;
1116 s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
1117 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1118 s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
1119 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1120 /* full_pel: only for mpeg1 */
1121 if (s->full_pel[i]){
1122 s->mv[i][0][0] <<= 1;
1123 s->mv[i][0][1] <<= 1;
1127 mb_type |= MB_TYPE_16x8;
1128 s->mv_type = MV_TYPE_16X8;
1130 s->field_select[i][j] = get_bits1(&s->gb);
1132 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1133 s->last_mv[i][j][k]);
1134 s->last_mv[i][j][k] = val;
1135 s->mv[i][j][k] = val;
1141 s->mv_type = MV_TYPE_FIELD;
1142 if (s->picture_structure == PICT_FRAME) {
1143 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1145 s->field_select[i][j] = get_bits1(&s->gb);
1146 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1147 s->last_mv[i][j][0]);
1148 s->last_mv[i][j][0] = val;
1149 s->mv[i][j][0] = val;
1150 dprintf("fmx=%d\n", val);
1151 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1152 s->last_mv[i][j][1] >> 1);
1153 s->last_mv[i][j][1] = val << 1;
1154 s->mv[i][j][1] = val;
1155 dprintf("fmy=%d\n", val);
1158 mb_type |= MB_TYPE_16x16;
1159 s->field_select[i][0] = get_bits1(&s->gb);
1161 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1162 s->last_mv[i][0][k]);
1163 s->last_mv[i][0][k] = val;
1164 s->last_mv[i][1][k] = val;
1165 s->mv[i][0][k] = val;
1171 int dmx, dmy, mx, my, m;
1173 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1174 s->last_mv[i][0][0]);
1175 s->last_mv[i][0][0] = mx;
1176 s->last_mv[i][1][0] = mx;
1178 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1179 s->last_mv[i][0][1] >> 1);
1181 s->mv_type = MV_TYPE_DMV;
1184 s->last_mv[i][0][1] = my<<1;
1185 s->last_mv[i][1][1] = my<<1;
1187 s->mv[i][0][0] = mx;
1188 s->mv[i][0][1] = my;
1189 s->mv[i][1][0] = mx;//not used
1190 s->mv[i][1][1] = my;//not used
1192 if (s->picture_structure == PICT_FRAME) {
1193 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1195 //m = 1 + 2 * s->top_field_first;
1196 m = s->top_field_first ? 1 : 3;
1198 /* top -> top pred */
1199 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1200 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1202 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1203 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1205 mb_type |= MB_TYPE_16x16;
1207 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1208 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1209 if(s->picture_structure == PICT_TOP_FIELD)
1223 if (IS_PAT(mb_type)) {
1224 cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1226 fprintf(stderr, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1231 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1234 if (mpeg2_decode_block_non_intra(s, block[i], i) < 0)
1237 s->block_last_index[i] = -1;
1244 if (mpeg1_decode_block_inter(s, block[i], i) < 0)
1247 s->block_last_index[i] = -1;
1254 s->block_last_index[i] = -1;
1258 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1263 /* as h263, but only 17 codes */
1264 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1266 int code, sign, val, l, shift;
1268 code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1276 sign = get_bits1(&s->gb);
1280 val = (val - 1) << shift;
1281 val |= get_bits(&s->gb, shift);
1288 /* modulo decoding */
1290 val = ((val + l)&(l*2-1)) - l;
1294 static inline int decode_dc(GetBitContext *gb, int component)
1298 if (component == 0) {
1299 code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1301 code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1304 fprintf(stderr, "invalid dc code at\n");
1310 diff = get_xbits(gb, code);
1315 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
1319 int level, dc, diff, i, j, run;
1321 RLTable *rl = &rl_mpeg1;
1322 uint8_t * const scantable= s->intra_scantable.permutated;
1323 const uint16_t *quant_matrix= s->intra_matrix;
1324 const int qscale= s->qscale;
1327 component = (n <= 3 ? 0 : n - 4 + 1);
1328 diff = decode_dc(&s->gb, component);
1331 dc = s->last_dc[component];
1333 s->last_dc[component] = dc;
1335 dprintf("dc=%d diff=%d\n", dc, diff);
1338 OPEN_READER(re, &s->gb);
1339 /* now quantify & encode AC coefs */
1341 UPDATE_CACHE(re, &s->gb);
1342 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1346 } else if(level != 0) {
1349 level= (level*qscale*quant_matrix[j])>>3;
1351 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1352 LAST_SKIP_BITS(re, &s->gb, 1);
1355 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1356 UPDATE_CACHE(re, &s->gb);
1357 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1358 if (level == -128) {
1359 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1360 } else if (level == 0) {
1361 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
1367 level= (level*qscale*quant_matrix[j])>>3;
1371 level= (level*qscale*quant_matrix[j])>>3;
1376 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1382 CLOSE_READER(re, &s->gb);
1384 s->block_last_index[n] = i;
1388 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
1392 int level, i, j, run;
1393 RLTable *rl = &rl_mpeg1;
1394 uint8_t * const scantable= s->intra_scantable.permutated;
1395 const uint16_t *quant_matrix= s->inter_matrix;
1396 const int qscale= s->qscale;
1400 OPEN_READER(re, &s->gb);
1402 /* special case for the first coef. no need to add a second vlc table */
1403 UPDATE_CACHE(re, &s->gb);
1404 v= SHOW_UBITS(re, &s->gb, 2);
1406 LAST_SKIP_BITS(re, &s->gb, 2);
1407 level= (3*qscale*quant_matrix[0])>>4;
1415 /* now quantify & encode AC coefs */
1417 UPDATE_CACHE(re, &s->gb);
1418 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1422 } else if(level != 0) {
1425 level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1427 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1428 LAST_SKIP_BITS(re, &s->gb, 1);
1431 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1432 UPDATE_CACHE(re, &s->gb);
1433 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1434 if (level == -128) {
1435 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1436 } else if (level == 0) {
1437 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
1443 level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1447 level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1452 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1458 CLOSE_READER(re, &s->gb);
1460 s->block_last_index[n] = i;
1464 /* Also does unquantization here, since I will never support mpeg2
1466 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
1470 int level, i, j, run;
1471 RLTable *rl = &rl_mpeg1;
1472 uint8_t * const scantable= s->intra_scantable.permutated;
1473 const uint16_t *quant_matrix;
1474 const int qscale= s->qscale;
1481 OPEN_READER(re, &s->gb);
1484 quant_matrix = s->inter_matrix;
1486 quant_matrix = s->chroma_inter_matrix;
1488 /* special case for the first coef. no need to add a second vlc table */
1489 UPDATE_CACHE(re, &s->gb);
1490 v= SHOW_UBITS(re, &s->gb, 2);
1492 LAST_SKIP_BITS(re, &s->gb, 2);
1493 level= (3*qscale*quant_matrix[0])>>5;
1501 /* now quantify & encode AC coefs */
1503 UPDATE_CACHE(re, &s->gb);
1504 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1508 } else if(level != 0) {
1511 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1512 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1513 LAST_SKIP_BITS(re, &s->gb, 1);
1516 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1517 UPDATE_CACHE(re, &s->gb);
1518 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1523 level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1526 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1530 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1537 CLOSE_READER(re, &s->gb);
1539 block[63] ^= (mismatch & 1);
1541 s->block_last_index[n] = i;
1545 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1549 int level, dc, diff, i, j, run;
1552 uint8_t * const scantable= s->intra_scantable.permutated;
1553 const uint16_t *quant_matrix;
1554 const int qscale= s->qscale;
1559 quant_matrix = s->intra_matrix;
1562 quant_matrix = s->chroma_intra_matrix;
1565 diff = decode_dc(&s->gb, component);
1568 dc = s->last_dc[component];
1570 s->last_dc[component] = dc;
1571 block[0] = dc << (3 - s->intra_dc_precision);
1572 dprintf("dc=%d\n", block[0]);
1573 mismatch = block[0] ^ 1;
1575 if (s->intra_vlc_format)
1581 OPEN_READER(re, &s->gb);
1582 /* now quantify & encode AC coefs */
1584 UPDATE_CACHE(re, &s->gb);
1585 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1589 } else if(level != 0) {
1592 level= (level*qscale*quant_matrix[j])>>4;
1593 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1594 LAST_SKIP_BITS(re, &s->gb, 1);
1597 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1598 UPDATE_CACHE(re, &s->gb);
1599 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1603 level= (-level*qscale*quant_matrix[j])>>4;
1606 level= (level*qscale*quant_matrix[j])>>4;
1610 fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1617 CLOSE_READER(re, &s->gb);
1619 block[63]^= mismatch&1;
1621 s->block_last_index[n] = i;
1625 typedef struct Mpeg1Context {
1626 MpegEncContext mpeg_enc_ctx;
1627 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1628 int repeat_field; /* true if we must repeat the field */
1631 static int mpeg_decode_init(AVCodecContext *avctx)
1633 Mpeg1Context *s = avctx->priv_data;
1635 s->mpeg_enc_ctx.flags= avctx->flags;
1636 common_init(&s->mpeg_enc_ctx);
1639 s->mpeg_enc_ctx_allocated = 0;
1640 s->mpeg_enc_ctx.picture_number = 0;
1641 s->repeat_field = 0;
1642 s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1646 /* return the 8 bit start code value and update the search
1647 state. Return -1 if no start code found */
1648 static int find_start_code(uint8_t **pbuf_ptr, uint8_t *buf_end)
1651 unsigned int state=0xFFFFFFFF, v;
1654 buf_ptr = *pbuf_ptr;
1655 while (buf_ptr < buf_end) {
1657 if (state == 0x000001) {
1658 state = ((state << 8) | v) & 0xffffff;
1662 state = ((state << 8) | v) & 0xffffff;
1666 *pbuf_ptr = buf_ptr;
1670 static int mpeg1_decode_picture(AVCodecContext *avctx,
1671 uint8_t *buf, int buf_size)
1673 Mpeg1Context *s1 = avctx->priv_data;
1674 MpegEncContext *s = &s1->mpeg_enc_ctx;
1677 init_get_bits(&s->gb, buf, buf_size*8);
1679 ref = get_bits(&s->gb, 10); /* temporal ref */
1680 s->pict_type = get_bits(&s->gb, 3);
1681 dprintf("pict_type=%d number=%d\n", s->pict_type, s->picture_number);
1683 skip_bits(&s->gb, 16);
1684 if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1685 s->full_pel[0] = get_bits1(&s->gb);
1686 f_code = get_bits(&s->gb, 3);
1689 s->mpeg_f_code[0][0] = f_code;
1690 s->mpeg_f_code[0][1] = f_code;
1692 if (s->pict_type == B_TYPE) {
1693 s->full_pel[1] = get_bits1(&s->gb);
1694 f_code = get_bits(&s->gb, 3);
1697 s->mpeg_f_code[1][0] = f_code;
1698 s->mpeg_f_code[1][1] = f_code;
1700 s->current_picture.pict_type= s->pict_type;
1701 s->current_picture.key_frame= s->pict_type == I_TYPE;
1709 static void mpeg_decode_sequence_extension(MpegEncContext *s)
1711 int horiz_size_ext, vert_size_ext;
1712 int bit_rate_ext, vbv_buf_ext;
1713 int frame_rate_ext_n, frame_rate_ext_d;
1717 skip_bits(&s->gb, 1); /* profil and level esc*/
1718 profile= get_bits(&s->gb, 3);
1719 level= get_bits(&s->gb, 4);
1720 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1721 skip_bits(&s->gb, 2); /* chroma_format */
1722 horiz_size_ext = get_bits(&s->gb, 2);
1723 vert_size_ext = get_bits(&s->gb, 2);
1724 s->width |= (horiz_size_ext << 12);
1725 s->height |= (vert_size_ext << 12);
1726 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1727 s->bit_rate = ((s->bit_rate / 400) | (bit_rate_ext << 12)) * 400;
1728 skip_bits1(&s->gb); /* marker */
1729 vbv_buf_ext = get_bits(&s->gb, 8);
1731 s->low_delay = get_bits1(&s->gb);
1732 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1734 frame_rate_ext_n = get_bits(&s->gb, 2);
1735 frame_rate_ext_d = get_bits(&s->gb, 5);
1737 &s->avctx->frame_rate,
1738 &s->avctx->frame_rate_base,
1739 frame_rate_tab[s->frame_rate_index] * (frame_rate_ext_n+1),
1740 MPEG1_FRAME_RATE_BASE * (frame_rate_ext_d+1),
1743 dprintf("sequence extension\n");
1744 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1745 s->avctx->sub_id = 2; /* indicates mpeg2 found */
1747 aspect= mpeg2_aspect[s->aspect_ratio_info];
1748 if(aspect>0.0) s->avctx->aspect_ratio= s->width/(aspect*s->height);
1749 else if(aspect<0.0) s->avctx->aspect_ratio= -1.0/aspect;
1751 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1752 printf("profile: %d, level: %d \n", profile, level);
1755 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1759 dprintf("matrix extension\n");
1761 if (get_bits1(&s->gb)) {
1763 v = get_bits(&s->gb, 8);
1764 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1765 s->intra_matrix[j] = v;
1766 s->chroma_intra_matrix[j] = v;
1769 if (get_bits1(&s->gb)) {
1771 v = get_bits(&s->gb, 8);
1772 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1773 s->inter_matrix[j] = v;
1774 s->chroma_inter_matrix[j] = v;
1777 if (get_bits1(&s->gb)) {
1779 v = get_bits(&s->gb, 8);
1780 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1781 s->chroma_intra_matrix[j] = v;
1784 if (get_bits1(&s->gb)) {
1786 v = get_bits(&s->gb, 8);
1787 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1788 s->chroma_inter_matrix[j] = v;
1793 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1795 s->full_pel[0] = s->full_pel[1] = 0;
1796 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1797 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1798 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1799 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1800 s->intra_dc_precision = get_bits(&s->gb, 2);
1801 s->picture_structure = get_bits(&s->gb, 2);
1802 s->top_field_first = get_bits1(&s->gb);
1803 s->frame_pred_frame_dct = get_bits1(&s->gb);
1804 s->concealment_motion_vectors = get_bits1(&s->gb);
1805 s->q_scale_type = get_bits1(&s->gb);
1806 s->intra_vlc_format = get_bits1(&s->gb);
1807 s->alternate_scan = get_bits1(&s->gb);
1808 s->repeat_first_field = get_bits1(&s->gb);
1809 s->chroma_420_type = get_bits1(&s->gb);
1810 s->progressive_frame = get_bits1(&s->gb);
1812 if(s->picture_structure == PICT_FRAME)
1815 s->first_field ^= 1;
1816 memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1819 if(s->alternate_scan){
1820 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
1821 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
1822 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
1823 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
1825 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
1826 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
1827 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
1828 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
1831 /* composite display not parsed */
1832 dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
1833 dprintf("picture_structure=%d\n", s->picture_structure);
1834 dprintf("top field first=%d\n", s->top_field_first);
1835 dprintf("repeat first field=%d\n", s->repeat_first_field);
1836 dprintf("conceal=%d\n", s->concealment_motion_vectors);
1837 dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
1838 dprintf("alternate_scan=%d\n", s->alternate_scan);
1839 dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1840 dprintf("progressive_frame=%d\n", s->progressive_frame);
1843 static void mpeg_decode_extension(AVCodecContext *avctx,
1844 uint8_t *buf, int buf_size)
1846 Mpeg1Context *s1 = avctx->priv_data;
1847 MpegEncContext *s = &s1->mpeg_enc_ctx;
1850 init_get_bits(&s->gb, buf, buf_size*8);
1852 ext_type = get_bits(&s->gb, 4);
1856 mpeg_decode_sequence_extension(s);
1859 /* quant matrix extension */
1860 mpeg_decode_quant_matrix_extension(s);
1863 /* picture extension */
1864 mpeg_decode_picture_coding_extension(s);
1869 static void exchange_uv(AVFrame *f){
1870 uint8_t *t= f->data[1];
1871 f->data[1]= f->data[2];
1875 #define DECODE_SLICE_FATAL_ERROR -2
1876 #define DECODE_SLICE_ERROR -1
1877 #define DECODE_SLICE_OK 0
1881 * @return DECODE_SLICE_FATAL_ERROR if a non recoverable error occured<br>
1882 * DECODE_SLICE_ERROR if the slice is damaged<br>
1883 * DECODE_SLICE_OK if this slice is ok<br>
1885 static int mpeg_decode_slice(AVCodecContext *avctx,
1888 uint8_t **buf, int buf_size)
1890 Mpeg1Context *s1 = avctx->priv_data;
1891 MpegEncContext *s = &s1->mpeg_enc_ctx;
1893 const int field_pic= s->picture_structure != PICT_FRAME;
1895 s->resync_mb_x= s->mb_x =
1896 s->resync_mb_y= s->mb_y = -1;
1898 start_code = (start_code - 1) & 0xff;
1899 if (start_code >= s->mb_height){
1900 fprintf(stderr, "slice below image (%d >= %d)\n", start_code, s->mb_height);
1904 ff_mpeg1_clean_buffers(s);
1905 s->interlaced_dct = 0;
1907 /* start frame decoding */
1908 if (s->first_slice) {
1909 if(s->first_field || s->picture_structure==PICT_FRAME){
1910 if(MPV_frame_start(s, avctx) < 0)
1911 return DECODE_SLICE_FATAL_ERROR;
1913 ff_er_frame_start(s);
1915 /* first check if we must repeat the frame */
1916 s->current_picture_ptr->repeat_pict = 0;
1917 if (s->repeat_first_field) {
1918 if (s->progressive_sequence) {
1919 if (s->top_field_first)
1920 s->current_picture_ptr->repeat_pict = 4;
1922 s->current_picture_ptr->repeat_pict = 2;
1923 } else if (s->progressive_frame) {
1924 s->current_picture_ptr->repeat_pict = 1;
1927 //printf("%d\n", s->current_picture_ptr->repeat_pict);
1929 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1930 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",
1931 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],
1932 s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
1933 s->progressive_sequence ? "pro" :"", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1934 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1935 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1937 }else{ //second field
1940 if(!s->current_picture_ptr){
1941 fprintf(stderr, "first field missing\n");
1946 s->current_picture.data[i] = s->current_picture_ptr->data[i];
1947 if(s->picture_structure == PICT_BOTTOM_FIELD){
1948 s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1953 // MPV_frame_start will call this function too,
1954 // but we need to call it on every field
1955 if(s->avctx->xvmc_acceleration)
1956 XVMC_field_start(s,avctx);
1958 }//fi(s->first_slice)
1961 init_get_bits(&s->gb, *buf, buf_size*8);
1963 s->qscale = get_qscale(s);
1965 fprintf(stderr, "qscale == 0\n");
1969 /* extra slice info */
1970 while (get_bits1(&s->gb) != 0) {
1971 skip_bits(&s->gb, 8);
1977 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1979 fprintf(stderr, "first mb_incr damaged\n");
1986 /* otherwise, stuffing, nothing to do */
1993 s->resync_mb_x= s->mb_x;
1994 s->resync_mb_y= s->mb_y = start_code;
1996 ff_init_block_index(s);
1999 s->dsp.clear_blocks(s->block[0]);
2001 ret = mpeg_decode_mb(s, s->block);
2003 dprintf("ret=%d\n", ret);
2007 if(s->motion_val && s->pict_type != B_TYPE){ //note motion_val is normally NULL unless we want to extract the MVs
2008 const int wrap = s->block_wrap[0];
2009 const int xy = s->mb_x*2 + 1 + (s->mb_y*2 +1)*wrap;
2010 int motion_x, motion_y;
2013 motion_x = motion_y = 0;
2014 }else if (s->mv_type == MV_TYPE_16X16) {
2015 motion_x = s->mv[0][0][0];
2016 motion_y = s->mv[0][0][1];
2017 } else /*if (s->mv_type == MV_TYPE_FIELD)*/ {
2018 motion_x = s->mv[0][0][0] + s->mv[0][1][0];
2019 motion_y = s->mv[0][0][1] + s->mv[0][1][1];
2020 motion_x = (motion_x>>1) | (motion_x&1);
2022 s->motion_val[xy][0] = motion_x;
2023 s->motion_val[xy][1] = motion_y;
2024 s->motion_val[xy + 1][0] = motion_x;
2025 s->motion_val[xy + 1][1] = motion_y;
2026 s->motion_val[xy + wrap][0] = motion_x;
2027 s->motion_val[xy + wrap][1] = motion_y;
2028 s->motion_val[xy + 1 + wrap][0] = motion_x;
2029 s->motion_val[xy + 1 + wrap][1] = motion_y;
2036 MPV_decode_mb(s, s->block);
2038 if (++s->mb_x >= s->mb_width) {
2039 if(s->avctx->codec_tag == ff_get_fourcc("VCR2"))
2040 exchange_uv((AVFrame*)s->current_picture_ptr);
2042 ff_draw_horiz_band(s, 16*s->mb_y, 16);
2044 if(s->avctx->codec_tag == ff_get_fourcc("VCR2"))
2045 exchange_uv((AVFrame*)s->current_picture_ptr);
2050 if(s->mb_y<<field_pic >= s->mb_height){
2051 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2053 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)))
2054 || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2055 fprintf(stderr, "end missmatch left=%d\n", left);
2061 ff_init_block_index(s);
2064 /* skip mb handling */
2065 if (s->mb_skip_run == -1) {
2066 /* read again increment */
2069 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2071 fprintf(stderr, "mb incr damaged\n");
2076 s->mb_skip_run += 33;
2077 }else if(code == 35){
2078 if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2079 fprintf(stderr, "slice missmatch\n");
2082 goto eos; /* end of slice */
2084 /* otherwise, stuffing, nothing to do */
2086 s->mb_skip_run += code;
2092 eos: // end of slice
2093 *buf += get_bits_count(&s->gb)/8 - 1;
2094 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2099 * handles slice ends.
2100 * @return 1 if it seems to be the last slice of
2102 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2104 Mpeg1Context *s1 = avctx->priv_data;
2105 MpegEncContext *s = &s1->mpeg_enc_ctx;
2107 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2111 if(s->avctx->xvmc_acceleration)
2114 /* end of slice reached */
2115 if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2118 if(s->codec_id == CODEC_ID_MPEG2VIDEO){
2119 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2121 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG1;
2127 if (s->pict_type == B_TYPE || s->low_delay) {
2128 *pict= *(AVFrame*)s->current_picture_ptr;
2129 ff_print_debug_info(s, s->current_picture_ptr);
2131 s->picture_number++;
2132 /* latency of 1 frame for I and P frames */
2133 /* XXX: use another variable than picture_number */
2134 if (s->last_picture_ptr != NULL) {
2135 *pict= *(AVFrame*)s->last_picture_ptr;
2136 ff_print_debug_info(s, s->last_picture_ptr);
2139 if(s->avctx->codec_tag == ff_get_fourcc("VCR2"))
2148 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2149 uint8_t *buf, int buf_size)
2151 Mpeg1Context *s1 = avctx->priv_data;
2152 MpegEncContext *s = &s1->mpeg_enc_ctx;
2153 int width, height, i, v, j;
2156 init_get_bits(&s->gb, buf, buf_size*8);
2158 width = get_bits(&s->gb, 12);
2159 height = get_bits(&s->gb, 12);
2160 s->aspect_ratio_info= get_bits(&s->gb, 4);
2161 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
2162 aspect= mpeg1_aspect[s->aspect_ratio_info];
2163 if(aspect!=0.0) avctx->aspect_ratio= width/(aspect*height);
2166 s->frame_rate_index = get_bits(&s->gb, 4);
2167 if (s->frame_rate_index == 0)
2169 s->bit_rate = get_bits(&s->gb, 18) * 400;
2170 if (get_bits1(&s->gb) == 0) /* marker */
2172 if (width <= 0 || height <= 0 ||
2173 (width % 2) != 0 || (height % 2) != 0)
2175 if (width != s->width ||
2176 height != s->height) {
2177 /* start new mpeg1 context decoding */
2178 s->out_format = FMT_MPEG1;
2179 if (s1->mpeg_enc_ctx_allocated) {
2184 avctx->has_b_frames= 1;
2186 avctx->width = width;
2187 avctx->height = height;
2190 &avctx->frame_rate_base,
2191 frame_rate_tab[s->frame_rate_index],
2192 MPEG1_FRAME_RATE_BASE, //FIXME store in allready reduced form
2195 avctx->bit_rate = s->bit_rate;
2197 //get_format() or set_video(width,height,aspect,pix_fmt);
2198 //until then pix_fmt may be changed right after codec init
2199 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2200 avctx->idct_algo = FF_IDCT_SIMPLE;
2202 if (MPV_common_init(s) < 0)
2204 s1->mpeg_enc_ctx_allocated = 1;
2207 skip_bits(&s->gb, 10); /* vbv_buffer_size */
2208 skip_bits(&s->gb, 1);
2211 if (get_bits1(&s->gb)) {
2213 v = get_bits(&s->gb, 8);
2214 j = s->intra_scantable.permutated[i];
2215 s->intra_matrix[j] = v;
2216 s->chroma_intra_matrix[j] = v;
2219 dprintf("intra matrix present\n");
2221 dprintf(" %d", s->intra_matrix[s->intra_scantable.permutated[i]]);
2226 int j= s->dsp.idct_permutation[i];
2227 v = ff_mpeg1_default_intra_matrix[i];
2228 s->intra_matrix[j] = v;
2229 s->chroma_intra_matrix[j] = v;
2232 if (get_bits1(&s->gb)) {
2234 v = get_bits(&s->gb, 8);
2235 j = s->intra_scantable.permutated[i];
2236 s->inter_matrix[j] = v;
2237 s->chroma_inter_matrix[j] = v;
2240 dprintf("non intra matrix present\n");
2242 dprintf(" %d", s->inter_matrix[s->intra_scantable.permutated[i]]);
2247 int j= s->dsp.idct_permutation[i];
2248 v = ff_mpeg1_default_non_intra_matrix[i];
2249 s->inter_matrix[j] = v;
2250 s->chroma_inter_matrix[j] = v;
2254 /* we set mpeg2 parameters so that it emulates mpeg1 */
2255 s->progressive_sequence = 1;
2256 s->progressive_frame = 1;
2257 s->picture_structure = PICT_FRAME;
2258 s->frame_pred_frame_dct = 1;
2259 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2260 avctx->sub_id = 1; /* indicates mpeg1 */
2264 static int vcr2_init_sequence(AVCodecContext *avctx)
2266 Mpeg1Context *s1 = avctx->priv_data;
2267 MpegEncContext *s = &s1->mpeg_enc_ctx;
2270 /* start new mpeg1 context decoding */
2271 s->out_format = FMT_MPEG1;
2272 if (s1->mpeg_enc_ctx_allocated) {
2275 s->width = avctx->width;
2276 s->height = avctx->height;
2277 avctx->has_b_frames= 0; //true?
2281 //get_format() or set_video(width,height,aspect,pix_fmt);
2282 //until then pix_fmt may be changed right after codec init
2283 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2284 avctx->idct_algo = FF_IDCT_SIMPLE;
2286 if (MPV_common_init(s) < 0)
2288 s1->mpeg_enc_ctx_allocated = 1;
2291 int j= s->dsp.idct_permutation[i];
2292 v = ff_mpeg1_default_intra_matrix[i];
2293 s->intra_matrix[j] = v;
2294 s->chroma_intra_matrix[j] = v;
2296 v = ff_mpeg1_default_non_intra_matrix[i];
2297 s->inter_matrix[j] = v;
2298 s->chroma_inter_matrix[j] = v;
2301 s->progressive_sequence = 1;
2302 s->progressive_frame = 1;
2303 s->picture_structure = PICT_FRAME;
2304 s->frame_pred_frame_dct = 1;
2305 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2306 avctx->sub_id = 2; /* indicates mpeg2 */
2311 static void mpeg_decode_user_data(AVCodecContext *avctx,
2312 const uint8_t *buf, int buf_size)
2319 /* we parse the DTG active format information */
2321 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2335 avctx->dtg_active_format = p[0] & 0x0f;
2341 * finds the end of the current frame in the bitstream.
2342 * @return the position of the first byte of the next frame, or -1
2344 static int mpeg1_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
2345 ParseContext *pc= &s->parse_context;
2352 if(!pc->frame_start_found){
2353 for(i=0; i<buf_size; i++){
2354 state= (state<<8) | buf[i];
2355 if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2357 pc->frame_start_found=1;
2363 if(pc->frame_start_found){
2364 for(; i<buf_size; i++){
2365 state= (state<<8) | buf[i];
2366 if((state&0xFFFFFF00) == 0x100){
2367 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2368 pc->frame_start_found=0;
2376 return END_NOT_FOUND;
2379 /* handle buffering and image synchronisation */
2380 static int mpeg_decode_frame(AVCodecContext *avctx,
2381 void *data, int *data_size,
2382 uint8_t *buf, int buf_size)
2384 Mpeg1Context *s = avctx->priv_data;
2385 uint8_t *buf_end, *buf_ptr;
2386 int ret, start_code, input_size;
2387 AVFrame *picture = data;
2388 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2389 dprintf("fill_buffer\n");
2393 /* special case for last picture */
2394 if (buf_size == 0 && s2->low_delay==0 && s2->next_picture_ptr) {
2395 *picture= *(AVFrame*)s2->next_picture_ptr;
2396 s2->next_picture_ptr= NULL;
2398 *data_size = sizeof(AVFrame);
2402 if(s2->flags&CODEC_FLAG_TRUNCATED){
2403 int next= mpeg1_find_frame_end(s2, buf, buf_size);
2405 if( ff_combine_frame(s2, next, &buf, &buf_size) < 0 )
2410 buf_end = buf + buf_size;
2413 if (s->repeat_field % 2 == 1) {
2415 //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2416 // s2->picture_number, s->repeat_field);
2417 if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2418 *data_size = sizeof(AVPicture);
2424 if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2425 vcr2_init_sequence(avctx);
2428 /* find start next code */
2429 start_code = find_start_code(&buf_ptr, buf_end);
2430 if (start_code < 0){
2431 if (slice_end(avctx, picture)) {
2432 if(s2->last_picture_ptr) //FIXME merge with the stuff in mpeg_decode_slice
2433 *data_size = sizeof(AVPicture);
2435 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2438 input_size = buf_end - buf_ptr;
2440 if(avctx->debug & FF_DEBUG_STARTCODE){
2441 printf("%3X at %d left %d\n", start_code, buf_ptr-buf, input_size);
2444 /* prepare data for next start code */
2445 switch(start_code) {
2446 case SEQ_START_CODE:
2447 mpeg1_decode_sequence(avctx, buf_ptr,
2451 case PICTURE_START_CODE:
2452 /* we have a complete image : we try to decompress it */
2453 mpeg1_decode_picture(avctx,
2454 buf_ptr, input_size);
2456 case EXT_START_CODE:
2457 mpeg_decode_extension(avctx,
2458 buf_ptr, input_size);
2460 case USER_START_CODE:
2461 mpeg_decode_user_data(avctx,
2462 buf_ptr, input_size);
2464 case GOP_START_CODE:
2468 if (start_code >= SLICE_MIN_START_CODE &&
2469 start_code <= SLICE_MAX_START_CODE) {
2471 /* skip b frames if we dont have reference frames */
2472 if(s2->last_picture_ptr==NULL && s2->pict_type==B_TYPE) break;
2473 /* skip b frames if we are in a hurry */
2474 if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2475 /* skip everything if we are in a hurry>=5 */
2476 if(avctx->hurry_up>=5) break;
2478 if (!s->mpeg_enc_ctx_allocated) break;
2480 ret = mpeg_decode_slice(avctx, picture,
2481 start_code, &buf_ptr, input_size);
2485 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2486 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);
2487 if(ret==DECODE_SLICE_FATAL_ERROR) return -1;
2489 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);
2497 static int mpeg_decode_end(AVCodecContext *avctx)
2499 Mpeg1Context *s = avctx->priv_data;
2501 if (s->mpeg_enc_ctx_allocated)
2502 MPV_common_end(&s->mpeg_enc_ctx);
2506 AVCodec mpeg1video_decoder = {
2509 CODEC_ID_MPEG1VIDEO,
2510 sizeof(Mpeg1Context),
2515 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2516 .flush= ff_mpeg_flush,
2519 AVCodec mpeg2video_decoder = {
2522 CODEC_ID_MPEG2VIDEO,
2523 sizeof(Mpeg1Context),
2528 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2529 .flush= ff_mpeg_flush,
2533 static int mpeg_mc_decode_init(AVCodecContext *avctx){
2536 if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2538 if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) )
2539 dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2541 mpeg_decode_init(avctx);
2542 s = avctx->priv_data;
2544 avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2545 avctx->xvmc_acceleration = 1;
2550 AVCodec mpeg_xvmc_decoder = {
2553 CODEC_ID_MPEG2VIDEO_XVMC,
2554 sizeof(Mpeg1Context),
2555 mpeg_mc_decode_init,
2559 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2564 /* this is ugly i know, but the alternative is too make
2565 hundreds of vars global and prefix them with ff_mpeg1_
2566 which is far uglier. */