2 * MSMPEG4 encoder backend
3 * Copyright (c) 2001 Fabrice Bellard
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
6 * msmpeg4v1 & v2 stuff by Michael Niedermayer <michaelni@gmx.at>
8 * This file is part of Libav.
10 * Libav is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
15 * Libav is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with Libav; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 * MSMPEG4 encoder backend
33 #include "libavutil/avutil.h"
34 #include "libavutil/mem.h"
35 #include "mpegvideo.h"
38 #include "mpeg4video.h"
40 #include "msmpeg4data.h"
45 static uint8_t rl_length[NB_RL_TABLES][MAX_LEVEL+1][MAX_RUN+1][2];
47 /* build the table which associate a (x,y) motion vector to a vlc */
48 static void init_mv_table(MVTable *tab)
52 tab->table_mv_index = av_malloc(sizeof(uint16_t) * 4096);
53 /* mark all entries as not used */
55 tab->table_mv_index[i] = tab->n;
57 for(i=0;i<tab->n;i++) {
58 x = tab->table_mvx[i];
59 y = tab->table_mvy[i];
60 tab->table_mv_index[(x << 6) | y] = i;
64 void ff_msmpeg4_code012(PutBitContext *pb, int n)
70 put_bits(pb, 1, (n >= 2));
74 static int get_size_of_code(MpegEncContext * s, RLTable *rl, int last, int run, int level, int intra){
77 int run_diff= intra ? 0 : 1;
79 code = get_rl_index(rl, last, run, level);
80 size+= rl->table_vlc[code][1];
84 level1 = level - rl->max_level[last][run];
87 code = get_rl_index(rl, last, run, level1);
91 if (level > MAX_LEVEL)
93 run1 = run - rl->max_run[last][level] - run_diff;
96 code = get_rl_index(rl, last, run1, level);
103 size+= 1+1+ rl->table_vlc[code][1];
107 size+= 1+1+ rl->table_vlc[code][1];
115 av_cold void ff_msmpeg4_encode_init(MpegEncContext *s)
117 static int init_done=0;
120 ff_msmpeg4_common_init(s);
121 if(s->msmpeg4_version>=4){
127 /* init various encoding tables */
129 init_mv_table(&ff_mv_tables[0]);
130 init_mv_table(&ff_mv_tables[1]);
131 for(i=0;i<NB_RL_TABLES;i++)
132 ff_init_rl(&ff_rl_table[i], ff_static_rl_table_store[i]);
134 for(i=0; i<NB_RL_TABLES; i++){
136 for (level = 1; level <= MAX_LEVEL; level++) {
138 for(run=0; run<=MAX_RUN; run++){
140 for(last=0; last<2; last++){
141 rl_length[i][level][run][last]= get_size_of_code(s, &ff_rl_table[ i], last, run, level, 0);
149 static void find_best_tables(MpegEncContext * s)
152 int best =-1, best_size =9999999;
153 int chroma_best=-1, best_chroma_size=9999999;
164 for(level=0; level<=MAX_LEVEL; level++){
166 for(run=0; run<=MAX_RUN; run++){
168 const int last_size= size + chroma_size;
169 for(last=0; last<2; last++){
170 int inter_count = s->ac_stats[0][0][level][run][last] + s->ac_stats[0][1][level][run][last];
171 int intra_luma_count = s->ac_stats[1][0][level][run][last];
172 int intra_chroma_count= s->ac_stats[1][1][level][run][last];
174 if(s->pict_type==AV_PICTURE_TYPE_I){
175 size += intra_luma_count *rl_length[i ][level][run][last];
176 chroma_size+= intra_chroma_count*rl_length[i+3][level][run][last];
178 size+= intra_luma_count *rl_length[i ][level][run][last]
179 +intra_chroma_count*rl_length[i+3][level][run][last]
180 +inter_count *rl_length[i+3][level][run][last];
183 if(last_size == size+chroma_size) break;
190 if(chroma_size<best_chroma_size){
191 best_chroma_size= chroma_size;
196 if(s->pict_type==AV_PICTURE_TYPE_P) chroma_best= best;
198 memset(s->ac_stats, 0, sizeof(int)*(MAX_LEVEL+1)*(MAX_RUN+1)*2*2*2);
200 s->rl_table_index = best;
201 s->rl_chroma_table_index= chroma_best;
203 if(s->pict_type != s->last_non_b_pict_type){
204 s->rl_table_index= 2;
205 if(s->pict_type==AV_PICTURE_TYPE_I)
206 s->rl_chroma_table_index= 1;
208 s->rl_chroma_table_index= 2;
213 /* write MSMPEG4 compatible frame header */
214 void ff_msmpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
218 avpriv_align_put_bits(&s->pb);
219 put_bits(&s->pb, 2, s->pict_type - 1);
221 put_bits(&s->pb, 5, s->qscale);
222 if(s->msmpeg4_version<=2){
223 s->rl_table_index = 2;
224 s->rl_chroma_table_index = 2;
227 s->dc_table_index = 1;
228 s->mv_table_index = 1; /* only if P frame */
229 s->use_skip_mb_code = 1; /* only if P frame */
230 s->per_mb_rl_table = 0;
231 if(s->msmpeg4_version==4)
232 s->inter_intra_pred= (s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE && s->pict_type==AV_PICTURE_TYPE_P);
233 av_dlog(s, "%d %d %d %d %d\n", s->pict_type, s->bit_rate,
234 s->inter_intra_pred, s->width, s->height);
236 if (s->pict_type == AV_PICTURE_TYPE_I) {
237 s->slice_height= s->mb_height/1;
238 put_bits(&s->pb, 5, 0x16 + s->mb_height/s->slice_height);
240 if(s->msmpeg4_version==4){
241 ff_msmpeg4_encode_ext_header(s);
242 if(s->bit_rate>MBAC_BITRATE)
243 put_bits(&s->pb, 1, s->per_mb_rl_table);
246 if(s->msmpeg4_version>2){
247 if(!s->per_mb_rl_table){
248 ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index);
249 ff_msmpeg4_code012(&s->pb, s->rl_table_index);
252 put_bits(&s->pb, 1, s->dc_table_index);
255 put_bits(&s->pb, 1, s->use_skip_mb_code);
257 if(s->msmpeg4_version==4 && s->bit_rate>MBAC_BITRATE)
258 put_bits(&s->pb, 1, s->per_mb_rl_table);
260 if(s->msmpeg4_version>2){
261 if(!s->per_mb_rl_table)
262 ff_msmpeg4_code012(&s->pb, s->rl_table_index);
264 put_bits(&s->pb, 1, s->dc_table_index);
266 put_bits(&s->pb, 1, s->mv_table_index);
270 s->esc3_level_length= 0;
271 s->esc3_run_length= 0;
274 void ff_msmpeg4_encode_ext_header(MpegEncContext * s)
276 put_bits(&s->pb, 5, s->avctx->time_base.den / s->avctx->time_base.num); //yes 29.97 -> 29
278 put_bits(&s->pb, 11, FFMIN(s->bit_rate/1024, 2047));
280 if(s->msmpeg4_version>=3)
281 put_bits(&s->pb, 1, s->flipflop_rounding);
283 assert(s->flipflop_rounding==0);
286 void ff_msmpeg4_encode_motion(MpegEncContext * s,
292 /* modulo encoding */
293 /* WARNING : you cannot reach all the MVs even with the modulo
294 encoding. This is a somewhat strange compromise they took !!! */
307 if ((unsigned)mx >= 64 ||
309 av_log(s->avctx, AV_LOG_ERROR, "error mx=%d my=%d\n", mx, my);
311 mv = &ff_mv_tables[s->mv_table_index];
313 code = mv->table_mv_index[(mx << 6) | my];
315 mv->table_mv_bits[code],
316 mv->table_mv_code[code]);
318 /* escape : code literally */
319 put_bits(&s->pb, 6, mx);
320 put_bits(&s->pb, 6, my);
324 void ff_msmpeg4_handle_slices(MpegEncContext *s){
326 if (s->slice_height && (s->mb_y % s->slice_height) == 0) {
327 if(s->msmpeg4_version < 4){
328 ff_mpeg4_clean_buffers(s);
330 s->first_slice_line = 1;
332 s->first_slice_line = 0;
337 static void msmpeg4v2_encode_motion(MpegEncContext * s, int val)
339 int range, bit_size, sign, code, bits;
344 put_bits(&s->pb, ff_mvtab[code][1], ff_mvtab[code][0]);
346 bit_size = s->f_code - 1;
347 range = 1 << bit_size;
360 code = (val >> bit_size) + 1;
361 bits = val & (range - 1);
363 put_bits(&s->pb, ff_mvtab[code][1] + 1, (ff_mvtab[code][0] << 1) | sign);
365 put_bits(&s->pb, bit_size, bits);
370 void ff_msmpeg4_encode_mb(MpegEncContext * s,
371 DCTELEM block[6][64],
372 int motion_x, int motion_y)
374 int cbp, coded_cbp, i;
376 uint8_t *coded_block;
378 ff_msmpeg4_handle_slices(s);
383 for (i = 0; i < 6; i++) {
384 if (s->block_last_index[i] >= 0)
387 if (s->use_skip_mb_code && (cbp | motion_x | motion_y) == 0) {
388 /* skip macroblock */
389 put_bits(&s->pb, 1, 1);
396 if (s->use_skip_mb_code)
397 put_bits(&s->pb, 1, 0); /* mb coded */
399 if(s->msmpeg4_version<=2){
401 ff_v2_mb_type[cbp&3][1],
402 ff_v2_mb_type[cbp&3][0]);
403 if((cbp&3) != 3) coded_cbp= cbp ^ 0x3C;
407 ff_h263_cbpy_tab[coded_cbp>>2][1],
408 ff_h263_cbpy_tab[coded_cbp>>2][0]);
410 s->misc_bits += get_bits_diff(s);
412 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
413 msmpeg4v2_encode_motion(s, motion_x - pred_x);
414 msmpeg4v2_encode_motion(s, motion_y - pred_y);
417 ff_table_mb_non_intra[cbp + 64][1],
418 ff_table_mb_non_intra[cbp + 64][0]);
420 s->misc_bits += get_bits_diff(s);
423 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
424 ff_msmpeg4_encode_motion(s, motion_x - pred_x,
428 s->mv_bits += get_bits_diff(s);
430 for (i = 0; i < 6; i++) {
431 ff_msmpeg4_encode_block(s, block[i], i);
433 s->p_tex_bits += get_bits_diff(s);
438 for (i = 0; i < 6; i++) {
440 val = (s->block_last_index[i] >= 1);
441 cbp |= val << (5 - i);
443 /* predict value for close blocks only for luma */
444 pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
448 coded_cbp |= val << (5 - i);
451 if(s->msmpeg4_version<=2){
452 if (s->pict_type == AV_PICTURE_TYPE_I) {
454 ff_v2_intra_cbpc[cbp&3][1], ff_v2_intra_cbpc[cbp&3][0]);
456 if (s->use_skip_mb_code)
457 put_bits(&s->pb, 1, 0); /* mb coded */
459 ff_v2_mb_type[(cbp&3) + 4][1],
460 ff_v2_mb_type[(cbp&3) + 4][0]);
462 put_bits(&s->pb, 1, 0); /* no AC prediction yet */
464 ff_h263_cbpy_tab[cbp>>2][1],
465 ff_h263_cbpy_tab[cbp>>2][0]);
467 if (s->pict_type == AV_PICTURE_TYPE_I) {
469 ff_msmp4_mb_i_table[coded_cbp][1], ff_msmp4_mb_i_table[coded_cbp][0]);
471 if (s->use_skip_mb_code)
472 put_bits(&s->pb, 1, 0); /* mb coded */
474 ff_table_mb_non_intra[cbp][1],
475 ff_table_mb_non_intra[cbp][0]);
477 put_bits(&s->pb, 1, 0); /* no AC prediction yet */
478 if(s->inter_intra_pred){
480 put_bits(&s->pb, ff_table_inter_intra[s->h263_aic_dir][1], ff_table_inter_intra[s->h263_aic_dir][0]);
483 s->misc_bits += get_bits_diff(s);
485 for (i = 0; i < 6; i++) {
486 ff_msmpeg4_encode_block(s, block[i], i);
488 s->i_tex_bits += get_bits_diff(s);
493 static void msmpeg4_encode_dc(MpegEncContext * s, int level, int n, int *dir_ptr)
500 pred = ff_msmpeg4_pred_dc(s, n, &dc_val, dir_ptr);
502 /* update predictor */
504 *dc_val = level * s->y_dc_scale;
506 *dc_val = level * s->c_dc_scale;
509 /* do the prediction */
512 if(s->msmpeg4_version<=2){
515 ff_v2_dc_lum_table[level + 256][1],
516 ff_v2_dc_lum_table[level + 256][0]);
519 ff_v2_dc_chroma_table[level + 256][1],
520 ff_v2_dc_chroma_table[level + 256][0]);
531 else if( s->msmpeg4_version>=6 ) {
532 if( s->qscale == 1 ) {
533 extquant = (level + 3) & 0x3;
534 code = ((level+3)>>2);
535 } else if( s->qscale == 2 ) {
536 extquant = (level + 1) & 0x1;
537 code = ((level+1)>>1);
541 if (s->dc_table_index == 0) {
543 put_bits(&s->pb, ff_table0_dc_lum[code][1], ff_table0_dc_lum[code][0]);
545 put_bits(&s->pb, ff_table0_dc_chroma[code][1], ff_table0_dc_chroma[code][0]);
549 put_bits(&s->pb, ff_table1_dc_lum[code][1], ff_table1_dc_lum[code][0]);
551 put_bits(&s->pb, ff_table1_dc_chroma[code][1], ff_table1_dc_chroma[code][0]);
555 if(s->msmpeg4_version>=6 && s->qscale<=2)
556 extrabits = 3 - s->qscale;
559 put_bits(&s->pb, 8 + extrabits, level);
560 else if(extrabits > 0)//== VC1 && s->qscale<=2
561 put_bits(&s->pb, extrabits, extquant);
564 put_bits(&s->pb, 1, sign);
569 /* Encoding of a block. Very similar to MPEG4 except for a different
570 escape coding (same as H263) and more vlc tables.
572 void ff_msmpeg4_encode_block(MpegEncContext * s, DCTELEM * block, int n)
574 int level, run, last, i, j, last_index;
575 int last_non_zero, sign, slevel;
576 int code, run_diff, dc_pred_dir;
578 const uint8_t *scantable;
581 msmpeg4_encode_dc(s, block[0], n, &dc_pred_dir);
584 rl = &ff_rl_table[s->rl_table_index];
586 rl = &ff_rl_table[3 + s->rl_chroma_table_index];
588 run_diff = s->msmpeg4_version>=4;
589 scantable= s->intra_scantable.permutated;
592 rl = &ff_rl_table[3 + s->rl_table_index];
593 if(s->msmpeg4_version<=2)
597 scantable= s->inter_scantable.permutated;
600 /* recalculate block_last_index for M$ wmv1 */
601 if(s->msmpeg4_version>=4 && s->msmpeg4_version<6 && s->block_last_index[n]>0){
602 for(last_index=63; last_index>=0; last_index--){
603 if(block[scantable[last_index]]) break;
605 s->block_last_index[n]= last_index;
607 last_index = s->block_last_index[n];
609 last_non_zero = i - 1;
610 for (; i <= last_index; i++) {
614 run = i - last_non_zero - 1;
615 last = (i == last_index);
623 if(level<=MAX_LEVEL && run<=MAX_RUN){
624 s->ac_stats[s->mb_intra][n>3][level][run][last]++;
627 s->ac_stats[s->mb_intra][n > 3][40][63][0]++; //esc3 like
629 code = get_rl_index(rl, last, run, level);
630 put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
634 level1 = level - rl->max_level[last][run];
637 code = get_rl_index(rl, last, run, level1);
640 put_bits(&s->pb, 1, 0);
641 if (level > MAX_LEVEL)
643 run1 = run - rl->max_run[last][level] - run_diff;
646 code = get_rl_index(rl, last, run1+1, level);
647 if (s->msmpeg4_version == 4 && code == rl->n)
649 code = get_rl_index(rl, last, run1, level);
653 put_bits(&s->pb, 1, 0);
654 put_bits(&s->pb, 1, last);
655 if(s->msmpeg4_version>=4){
656 if(s->esc3_level_length==0){
657 s->esc3_level_length=8;
658 s->esc3_run_length= 6;
659 //ESCLVLSZ + ESCRUNSZ
661 put_bits(&s->pb, 6 + (s->msmpeg4_version>=6), 3);
663 put_bits(&s->pb, 8, 3);
665 put_bits(&s->pb, s->esc3_run_length, run);
666 put_bits(&s->pb, 1, sign);
667 put_bits(&s->pb, s->esc3_level_length, level);
669 put_bits(&s->pb, 6, run);
670 put_sbits(&s->pb, 8, slevel);
674 put_bits(&s->pb, 1, 1);
675 put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
676 put_bits(&s->pb, 1, sign);
680 put_bits(&s->pb, 1, 1);
681 put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
682 put_bits(&s->pb, 1, sign);
685 put_bits(&s->pb, 1, sign);