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 // printf("type:%d, best:%d, qp:%d, var:%d, mcvar:%d, size:%d //\n",
197 // s->pict_type, best, s->qscale, s->mb_var_sum, s->mc_mb_var_sum, best_size);
199 if(s->pict_type==AV_PICTURE_TYPE_P) chroma_best= best;
201 memset(s->ac_stats, 0, sizeof(int)*(MAX_LEVEL+1)*(MAX_RUN+1)*2*2*2);
203 s->rl_table_index = best;
204 s->rl_chroma_table_index= chroma_best;
206 if(s->pict_type != s->last_non_b_pict_type){
207 s->rl_table_index= 2;
208 if(s->pict_type==AV_PICTURE_TYPE_I)
209 s->rl_chroma_table_index= 1;
211 s->rl_chroma_table_index= 2;
216 /* write MSMPEG4 compatible frame header */
217 void ff_msmpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
221 avpriv_align_put_bits(&s->pb);
222 put_bits(&s->pb, 2, s->pict_type - 1);
224 put_bits(&s->pb, 5, s->qscale);
225 if(s->msmpeg4_version<=2){
226 s->rl_table_index = 2;
227 s->rl_chroma_table_index = 2;
230 s->dc_table_index = 1;
231 s->mv_table_index = 1; /* only if P frame */
232 s->use_skip_mb_code = 1; /* only if P frame */
233 s->per_mb_rl_table = 0;
234 if(s->msmpeg4_version==4)
235 s->inter_intra_pred= (s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE && s->pict_type==AV_PICTURE_TYPE_P);
236 //printf("%d %d %d %d %d\n", s->pict_type, s->bit_rate, s->inter_intra_pred, s->width, s->height);
238 if (s->pict_type == AV_PICTURE_TYPE_I) {
239 s->slice_height= s->mb_height/1;
240 put_bits(&s->pb, 5, 0x16 + s->mb_height/s->slice_height);
242 if(s->msmpeg4_version==4){
243 ff_msmpeg4_encode_ext_header(s);
244 if(s->bit_rate>MBAC_BITRATE)
245 put_bits(&s->pb, 1, s->per_mb_rl_table);
248 if(s->msmpeg4_version>2){
249 if(!s->per_mb_rl_table){
250 ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index);
251 ff_msmpeg4_code012(&s->pb, s->rl_table_index);
254 put_bits(&s->pb, 1, s->dc_table_index);
257 put_bits(&s->pb, 1, s->use_skip_mb_code);
259 if(s->msmpeg4_version==4 && s->bit_rate>MBAC_BITRATE)
260 put_bits(&s->pb, 1, s->per_mb_rl_table);
262 if(s->msmpeg4_version>2){
263 if(!s->per_mb_rl_table)
264 ff_msmpeg4_code012(&s->pb, s->rl_table_index);
266 put_bits(&s->pb, 1, s->dc_table_index);
268 put_bits(&s->pb, 1, s->mv_table_index);
272 s->esc3_level_length= 0;
273 s->esc3_run_length= 0;
276 void ff_msmpeg4_encode_ext_header(MpegEncContext * s)
278 put_bits(&s->pb, 5, s->avctx->time_base.den / s->avctx->time_base.num); //yes 29.97 -> 29
280 put_bits(&s->pb, 11, FFMIN(s->bit_rate/1024, 2047));
282 if(s->msmpeg4_version>=3)
283 put_bits(&s->pb, 1, s->flipflop_rounding);
285 assert(s->flipflop_rounding==0);
288 void ff_msmpeg4_encode_motion(MpegEncContext * s,
294 /* modulo encoding */
295 /* WARNING : you cannot reach all the MVs even with the modulo
296 encoding. This is a somewhat strange compromise they took !!! */
309 if ((unsigned)mx >= 64 ||
311 av_log(s->avctx, AV_LOG_ERROR, "error mx=%d my=%d\n", mx, my);
313 mv = &ff_mv_tables[s->mv_table_index];
315 code = mv->table_mv_index[(mx << 6) | my];
317 mv->table_mv_bits[code],
318 mv->table_mv_code[code]);
320 /* escape : code literally */
321 put_bits(&s->pb, 6, mx);
322 put_bits(&s->pb, 6, my);
326 void ff_msmpeg4_handle_slices(MpegEncContext *s){
328 if (s->slice_height && (s->mb_y % s->slice_height) == 0) {
329 if(s->msmpeg4_version < 4){
330 ff_mpeg4_clean_buffers(s);
332 s->first_slice_line = 1;
334 s->first_slice_line = 0;
339 static void msmpeg4v2_encode_motion(MpegEncContext * s, int val)
341 int range, bit_size, sign, code, bits;
346 put_bits(&s->pb, ff_mvtab[code][1], ff_mvtab[code][0]);
348 bit_size = s->f_code - 1;
349 range = 1 << bit_size;
362 code = (val >> bit_size) + 1;
363 bits = val & (range - 1);
365 put_bits(&s->pb, ff_mvtab[code][1] + 1, (ff_mvtab[code][0] << 1) | sign);
367 put_bits(&s->pb, bit_size, bits);
372 void ff_msmpeg4_encode_mb(MpegEncContext * s,
373 DCTELEM block[6][64],
374 int motion_x, int motion_y)
376 int cbp, coded_cbp, i;
378 uint8_t *coded_block;
380 ff_msmpeg4_handle_slices(s);
385 for (i = 0; i < 6; i++) {
386 if (s->block_last_index[i] >= 0)
389 if (s->use_skip_mb_code && (cbp | motion_x | motion_y) == 0) {
390 /* skip macroblock */
391 put_bits(&s->pb, 1, 1);
398 if (s->use_skip_mb_code)
399 put_bits(&s->pb, 1, 0); /* mb coded */
401 if(s->msmpeg4_version<=2){
403 ff_v2_mb_type[cbp&3][1],
404 ff_v2_mb_type[cbp&3][0]);
405 if((cbp&3) != 3) coded_cbp= cbp ^ 0x3C;
409 ff_h263_cbpy_tab[coded_cbp>>2][1],
410 ff_h263_cbpy_tab[coded_cbp>>2][0]);
412 s->misc_bits += get_bits_diff(s);
414 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
415 msmpeg4v2_encode_motion(s, motion_x - pred_x);
416 msmpeg4v2_encode_motion(s, motion_y - pred_y);
419 ff_table_mb_non_intra[cbp + 64][1],
420 ff_table_mb_non_intra[cbp + 64][0]);
422 s->misc_bits += get_bits_diff(s);
425 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
426 ff_msmpeg4_encode_motion(s, motion_x - pred_x,
430 s->mv_bits += get_bits_diff(s);
432 for (i = 0; i < 6; i++) {
433 ff_msmpeg4_encode_block(s, block[i], i);
435 s->p_tex_bits += get_bits_diff(s);
440 for (i = 0; i < 6; i++) {
442 val = (s->block_last_index[i] >= 1);
443 cbp |= val << (5 - i);
445 /* predict value for close blocks only for luma */
446 pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
450 coded_cbp |= val << (5 - i);
453 if(s->msmpeg4_version<=2){
454 if (s->pict_type == AV_PICTURE_TYPE_I) {
456 ff_v2_intra_cbpc[cbp&3][1], ff_v2_intra_cbpc[cbp&3][0]);
458 if (s->use_skip_mb_code)
459 put_bits(&s->pb, 1, 0); /* mb coded */
461 ff_v2_mb_type[(cbp&3) + 4][1],
462 ff_v2_mb_type[(cbp&3) + 4][0]);
464 put_bits(&s->pb, 1, 0); /* no AC prediction yet */
466 ff_h263_cbpy_tab[cbp>>2][1],
467 ff_h263_cbpy_tab[cbp>>2][0]);
469 if (s->pict_type == AV_PICTURE_TYPE_I) {
471 ff_msmp4_mb_i_table[coded_cbp][1], ff_msmp4_mb_i_table[coded_cbp][0]);
473 if (s->use_skip_mb_code)
474 put_bits(&s->pb, 1, 0); /* mb coded */
476 ff_table_mb_non_intra[cbp][1],
477 ff_table_mb_non_intra[cbp][0]);
479 put_bits(&s->pb, 1, 0); /* no AC prediction yet */
480 if(s->inter_intra_pred){
482 put_bits(&s->pb, ff_table_inter_intra[s->h263_aic_dir][1], ff_table_inter_intra[s->h263_aic_dir][0]);
485 s->misc_bits += get_bits_diff(s);
487 for (i = 0; i < 6; i++) {
488 ff_msmpeg4_encode_block(s, block[i], i);
490 s->i_tex_bits += get_bits_diff(s);
495 static void msmpeg4_encode_dc(MpegEncContext * s, int level, int n, int *dir_ptr)
502 pred = ff_msmpeg4_pred_dc(s, n, &dc_val, dir_ptr);
504 /* update predictor */
506 *dc_val = level * s->y_dc_scale;
508 *dc_val = level * s->c_dc_scale;
511 /* do the prediction */
514 if(s->msmpeg4_version<=2){
517 ff_v2_dc_lum_table[level + 256][1],
518 ff_v2_dc_lum_table[level + 256][0]);
521 ff_v2_dc_chroma_table[level + 256][1],
522 ff_v2_dc_chroma_table[level + 256][0]);
533 else if( s->msmpeg4_version>=6 ) {
534 if( s->qscale == 1 ) {
535 extquant = (level + 3) & 0x3;
536 code = ((level+3)>>2);
537 } else if( s->qscale == 2 ) {
538 extquant = (level + 1) & 0x1;
539 code = ((level+1)>>1);
543 if (s->dc_table_index == 0) {
545 put_bits(&s->pb, ff_table0_dc_lum[code][1], ff_table0_dc_lum[code][0]);
547 put_bits(&s->pb, ff_table0_dc_chroma[code][1], ff_table0_dc_chroma[code][0]);
551 put_bits(&s->pb, ff_table1_dc_lum[code][1], ff_table1_dc_lum[code][0]);
553 put_bits(&s->pb, ff_table1_dc_chroma[code][1], ff_table1_dc_chroma[code][0]);
557 if(s->msmpeg4_version>=6 && s->qscale<=2)
558 extrabits = 3 - s->qscale;
561 put_bits(&s->pb, 8 + extrabits, level);
562 else if(extrabits > 0)//== VC1 && s->qscale<=2
563 put_bits(&s->pb, extrabits, extquant);
566 put_bits(&s->pb, 1, sign);
571 /* Encoding of a block. Very similar to MPEG4 except for a different
572 escape coding (same as H263) and more vlc tables.
574 void ff_msmpeg4_encode_block(MpegEncContext * s, DCTELEM * block, int n)
576 int level, run, last, i, j, last_index;
577 int last_non_zero, sign, slevel;
578 int code, run_diff, dc_pred_dir;
580 const uint8_t *scantable;
583 msmpeg4_encode_dc(s, block[0], n, &dc_pred_dir);
586 rl = &ff_rl_table[s->rl_table_index];
588 rl = &ff_rl_table[3 + s->rl_chroma_table_index];
590 run_diff = s->msmpeg4_version>=4;
591 scantable= s->intra_scantable.permutated;
594 rl = &ff_rl_table[3 + s->rl_table_index];
595 if(s->msmpeg4_version<=2)
599 scantable= s->inter_scantable.permutated;
602 /* recalculate block_last_index for M$ wmv1 */
603 if(s->msmpeg4_version>=4 && s->msmpeg4_version<6 && s->block_last_index[n]>0){
604 for(last_index=63; last_index>=0; last_index--){
605 if(block[scantable[last_index]]) break;
607 s->block_last_index[n]= last_index;
609 last_index = s->block_last_index[n];
611 last_non_zero = i - 1;
612 for (; i <= last_index; i++) {
616 run = i - last_non_zero - 1;
617 last = (i == last_index);
625 if(level<=MAX_LEVEL && run<=MAX_RUN){
626 s->ac_stats[s->mb_intra][n>3][level][run][last]++;
629 s->ac_stats[s->mb_intra][n > 3][40][63][0]++; //esc3 like
631 code = get_rl_index(rl, last, run, level);
632 put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
636 level1 = level - rl->max_level[last][run];
639 code = get_rl_index(rl, last, run, level1);
642 put_bits(&s->pb, 1, 0);
643 if (level > MAX_LEVEL)
645 run1 = run - rl->max_run[last][level] - run_diff;
648 code = get_rl_index(rl, last, run1+1, level);
649 if (s->msmpeg4_version == 4 && code == rl->n)
651 code = get_rl_index(rl, last, run1, level);
655 put_bits(&s->pb, 1, 0);
656 put_bits(&s->pb, 1, last);
657 if(s->msmpeg4_version>=4){
658 if(s->esc3_level_length==0){
659 s->esc3_level_length=8;
660 s->esc3_run_length= 6;
661 //ESCLVLSZ + ESCRUNSZ
663 put_bits(&s->pb, 6 + (s->msmpeg4_version>=6), 3);
665 put_bits(&s->pb, 8, 3);
667 put_bits(&s->pb, s->esc3_run_length, run);
668 put_bits(&s->pb, 1, sign);
669 put_bits(&s->pb, s->esc3_level_length, level);
671 put_bits(&s->pb, 6, run);
672 put_sbits(&s->pb, 8, slevel);
676 put_bits(&s->pb, 1, 1);
677 put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
678 put_bits(&s->pb, 1, sign);
682 put_bits(&s->pb, 1, 1);
683 put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
684 put_bits(&s->pb, 1, sign);
687 put_bits(&s->pb, 1, sign);