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/attributes.h"
34 #include "libavutil/avutil.h"
35 #include "libavutil/mem.h"
36 #include "mpegvideo.h"
40 #include "mpeg4video.h"
42 #include "msmpeg4data.h"
47 static uint8_t rl_length[NB_RL_TABLES][MAX_LEVEL+1][MAX_RUN+1][2];
49 /* build the table which associate a (x,y) motion vector to a vlc */
50 static av_cold int init_mv_table(MVTable *tab)
54 tab->table_mv_index = av_malloc(sizeof(uint16_t) * 4096);
55 if (!tab->table_mv_index)
56 return AVERROR(ENOMEM);
58 /* mark all entries as not used */
60 tab->table_mv_index[i] = tab->n;
62 for(i=0;i<tab->n;i++) {
63 x = tab->table_mvx[i];
64 y = tab->table_mvy[i];
65 tab->table_mv_index[(x << 6) | y] = i;
71 void ff_msmpeg4_code012(PutBitContext *pb, int n)
77 put_bits(pb, 1, (n >= 2));
81 static int get_size_of_code(MpegEncContext * s, RLTable *rl, int last, int run, int level, int intra){
84 int run_diff= intra ? 0 : 1;
86 code = get_rl_index(rl, last, run, level);
87 size+= rl->table_vlc[code][1];
91 level1 = level - rl->max_level[last][run];
94 code = get_rl_index(rl, last, run, level1);
98 if (level > MAX_LEVEL)
100 run1 = run - rl->max_run[last][level] - run_diff;
103 code = get_rl_index(rl, last, run1, level);
110 size+= 1+1+ rl->table_vlc[code][1];
114 size+= 1+1+ rl->table_vlc[code][1];
122 av_cold int ff_msmpeg4_encode_init(MpegEncContext *s)
124 static int init_done=0;
127 ff_msmpeg4_common_init(s);
128 if(s->msmpeg4_version>=4){
134 /* init various encoding tables */
136 if ((ret = init_mv_table(&ff_mv_tables[0])) < 0)
138 if ((ret = init_mv_table(&ff_mv_tables[1])) < 0)
140 for(i=0;i<NB_RL_TABLES;i++)
141 ff_rl_init(&ff_rl_table[i], ff_static_rl_table_store[i]);
143 for(i=0; i<NB_RL_TABLES; i++){
145 for (level = 1; level <= MAX_LEVEL; level++) {
147 for(run=0; run<=MAX_RUN; run++){
149 for(last=0; last<2; last++){
150 rl_length[i][level][run][last]= get_size_of_code(s, &ff_rl_table[ i], last, run, level, 0);
160 static void find_best_tables(MpegEncContext * s)
163 int best =-1, best_size =9999999;
164 int chroma_best=-1, best_chroma_size=9999999;
175 for(level=0; level<=MAX_LEVEL; level++){
177 for(run=0; run<=MAX_RUN; run++){
179 const int last_size= size + chroma_size;
180 for(last=0; last<2; last++){
181 int inter_count = s->ac_stats[0][0][level][run][last] + s->ac_stats[0][1][level][run][last];
182 int intra_luma_count = s->ac_stats[1][0][level][run][last];
183 int intra_chroma_count= s->ac_stats[1][1][level][run][last];
185 if(s->pict_type==AV_PICTURE_TYPE_I){
186 size += intra_luma_count *rl_length[i ][level][run][last];
187 chroma_size+= intra_chroma_count*rl_length[i+3][level][run][last];
189 size+= intra_luma_count *rl_length[i ][level][run][last]
190 +intra_chroma_count*rl_length[i+3][level][run][last]
191 +inter_count *rl_length[i+3][level][run][last];
194 if(last_size == size+chroma_size) break;
201 if(chroma_size<best_chroma_size){
202 best_chroma_size= chroma_size;
207 if(s->pict_type==AV_PICTURE_TYPE_P) chroma_best= best;
209 memset(s->ac_stats, 0, sizeof(int)*(MAX_LEVEL+1)*(MAX_RUN+1)*2*2*2);
211 s->rl_table_index = best;
212 s->rl_chroma_table_index= chroma_best;
214 if(s->pict_type != s->last_non_b_pict_type){
215 s->rl_table_index= 2;
216 if(s->pict_type==AV_PICTURE_TYPE_I)
217 s->rl_chroma_table_index= 1;
219 s->rl_chroma_table_index= 2;
224 /* write MSMPEG4 compatible frame header */
225 void ff_msmpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
229 avpriv_align_put_bits(&s->pb);
230 put_bits(&s->pb, 2, s->pict_type - 1);
232 put_bits(&s->pb, 5, s->qscale);
233 if(s->msmpeg4_version<=2){
234 s->rl_table_index = 2;
235 s->rl_chroma_table_index = 2;
238 s->dc_table_index = 1;
239 s->mv_table_index = 1; /* only if P-frame */
240 s->use_skip_mb_code = 1; /* only if P-frame */
241 s->per_mb_rl_table = 0;
242 if(s->msmpeg4_version==4)
243 s->inter_intra_pred= (s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE && s->pict_type==AV_PICTURE_TYPE_P);
244 ff_dlog(s, "%d %d %d %d %d\n", s->pict_type, s->bit_rate,
245 s->inter_intra_pred, s->width, s->height);
247 if (s->pict_type == AV_PICTURE_TYPE_I) {
248 s->slice_height= s->mb_height/1;
249 put_bits(&s->pb, 5, 0x16 + s->mb_height/s->slice_height);
251 if(s->msmpeg4_version==4){
252 ff_msmpeg4_encode_ext_header(s);
253 if(s->bit_rate>MBAC_BITRATE)
254 put_bits(&s->pb, 1, s->per_mb_rl_table);
257 if(s->msmpeg4_version>2){
258 if(!s->per_mb_rl_table){
259 ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index);
260 ff_msmpeg4_code012(&s->pb, s->rl_table_index);
263 put_bits(&s->pb, 1, s->dc_table_index);
266 put_bits(&s->pb, 1, s->use_skip_mb_code);
268 if(s->msmpeg4_version==4 && s->bit_rate>MBAC_BITRATE)
269 put_bits(&s->pb, 1, s->per_mb_rl_table);
271 if(s->msmpeg4_version>2){
272 if(!s->per_mb_rl_table)
273 ff_msmpeg4_code012(&s->pb, s->rl_table_index);
275 put_bits(&s->pb, 1, s->dc_table_index);
277 put_bits(&s->pb, 1, s->mv_table_index);
281 s->esc3_level_length= 0;
282 s->esc3_run_length= 0;
285 void ff_msmpeg4_encode_ext_header(MpegEncContext * s)
287 put_bits(&s->pb, 5, s->avctx->time_base.den / s->avctx->time_base.num); //yes 29.97 -> 29
289 put_bits(&s->pb, 11, FFMIN(s->bit_rate/1024, 2047));
291 if(s->msmpeg4_version>=3)
292 put_bits(&s->pb, 1, s->flipflop_rounding);
294 assert(s->flipflop_rounding==0);
297 void ff_msmpeg4_encode_motion(MpegEncContext * s,
303 /* modulo encoding */
304 /* WARNING : you cannot reach all the MVs even with the modulo
305 encoding. This is a somewhat strange compromise they took !!! */
317 mv = &ff_mv_tables[s->mv_table_index];
319 code = mv->table_mv_index[(mx << 6) | my];
321 mv->table_mv_bits[code],
322 mv->table_mv_code[code]);
324 /* escape : code literally */
325 put_bits(&s->pb, 6, mx);
326 put_bits(&s->pb, 6, my);
330 void ff_msmpeg4_handle_slices(MpegEncContext *s){
332 if (s->slice_height && (s->mb_y % s->slice_height) == 0) {
333 if(s->msmpeg4_version < 4){
334 ff_mpeg4_clean_buffers(s);
336 s->first_slice_line = 1;
338 s->first_slice_line = 0;
343 static void msmpeg4v2_encode_motion(MpegEncContext * s, int val)
345 int range, bit_size, sign, code, bits;
350 put_bits(&s->pb, ff_mvtab[code][1], ff_mvtab[code][0]);
352 bit_size = s->f_code - 1;
353 range = 1 << bit_size;
366 code = (val >> bit_size) + 1;
367 bits = val & (range - 1);
369 put_bits(&s->pb, ff_mvtab[code][1] + 1, (ff_mvtab[code][0] << 1) | sign);
371 put_bits(&s->pb, bit_size, bits);
376 void ff_msmpeg4_encode_mb(MpegEncContext * s,
377 int16_t block[6][64],
378 int motion_x, int motion_y)
380 int cbp, coded_cbp, i;
382 uint8_t *coded_block;
384 ff_msmpeg4_handle_slices(s);
389 for (i = 0; i < 6; i++) {
390 if (s->block_last_index[i] >= 0)
393 if (s->use_skip_mb_code && (cbp | motion_x | motion_y) == 0) {
394 /* skip macroblock */
395 put_bits(&s->pb, 1, 1);
402 if (s->use_skip_mb_code)
403 put_bits(&s->pb, 1, 0); /* mb coded */
405 if(s->msmpeg4_version<=2){
407 ff_v2_mb_type[cbp&3][1],
408 ff_v2_mb_type[cbp&3][0]);
409 if((cbp&3) != 3) coded_cbp= cbp ^ 0x3C;
413 ff_h263_cbpy_tab[coded_cbp>>2][1],
414 ff_h263_cbpy_tab[coded_cbp>>2][0]);
416 s->misc_bits += get_bits_diff(s);
418 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
419 msmpeg4v2_encode_motion(s, motion_x - pred_x);
420 msmpeg4v2_encode_motion(s, motion_y - pred_y);
423 ff_table_mb_non_intra[cbp + 64][1],
424 ff_table_mb_non_intra[cbp + 64][0]);
426 s->misc_bits += get_bits_diff(s);
429 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
430 ff_msmpeg4_encode_motion(s, motion_x - pred_x,
434 s->mv_bits += get_bits_diff(s);
436 for (i = 0; i < 6; i++) {
437 ff_msmpeg4_encode_block(s, block[i], i);
439 s->p_tex_bits += get_bits_diff(s);
444 for (i = 0; i < 6; i++) {
446 val = (s->block_last_index[i] >= 1);
447 cbp |= val << (5 - i);
449 /* predict value for close blocks only for luma */
450 pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
454 coded_cbp |= val << (5 - i);
457 if(s->msmpeg4_version<=2){
458 if (s->pict_type == AV_PICTURE_TYPE_I) {
460 ff_v2_intra_cbpc[cbp&3][1], ff_v2_intra_cbpc[cbp&3][0]);
462 if (s->use_skip_mb_code)
463 put_bits(&s->pb, 1, 0); /* mb coded */
465 ff_v2_mb_type[(cbp&3) + 4][1],
466 ff_v2_mb_type[(cbp&3) + 4][0]);
468 put_bits(&s->pb, 1, 0); /* no AC prediction yet */
470 ff_h263_cbpy_tab[cbp>>2][1],
471 ff_h263_cbpy_tab[cbp>>2][0]);
473 if (s->pict_type == AV_PICTURE_TYPE_I) {
475 ff_msmp4_mb_i_table[coded_cbp][1], ff_msmp4_mb_i_table[coded_cbp][0]);
477 if (s->use_skip_mb_code)
478 put_bits(&s->pb, 1, 0); /* mb coded */
480 ff_table_mb_non_intra[cbp][1],
481 ff_table_mb_non_intra[cbp][0]);
483 put_bits(&s->pb, 1, 0); /* no AC prediction yet */
484 if(s->inter_intra_pred){
486 put_bits(&s->pb, ff_table_inter_intra[s->h263_aic_dir][1], ff_table_inter_intra[s->h263_aic_dir][0]);
489 s->misc_bits += get_bits_diff(s);
491 for (i = 0; i < 6; i++) {
492 ff_msmpeg4_encode_block(s, block[i], i);
494 s->i_tex_bits += get_bits_diff(s);
499 static void msmpeg4_encode_dc(MpegEncContext * s, int level, int n, int *dir_ptr)
506 pred = ff_msmpeg4_pred_dc(s, n, &dc_val, dir_ptr);
508 /* update predictor */
510 *dc_val = level * s->y_dc_scale;
512 *dc_val = level * s->c_dc_scale;
515 /* do the prediction */
518 if(s->msmpeg4_version<=2){
521 ff_v2_dc_lum_table[level + 256][1],
522 ff_v2_dc_lum_table[level + 256][0]);
525 ff_v2_dc_chroma_table[level + 256][1],
526 ff_v2_dc_chroma_table[level + 256][0]);
537 else if( s->msmpeg4_version>=6 ) {
538 if( s->qscale == 1 ) {
539 extquant = (level + 3) & 0x3;
540 code = ((level+3)>>2);
541 } else if( s->qscale == 2 ) {
542 extquant = (level + 1) & 0x1;
543 code = ((level+1)>>1);
547 if (s->dc_table_index == 0) {
549 put_bits(&s->pb, ff_table0_dc_lum[code][1], ff_table0_dc_lum[code][0]);
551 put_bits(&s->pb, ff_table0_dc_chroma[code][1], ff_table0_dc_chroma[code][0]);
555 put_bits(&s->pb, ff_table1_dc_lum[code][1], ff_table1_dc_lum[code][0]);
557 put_bits(&s->pb, ff_table1_dc_chroma[code][1], ff_table1_dc_chroma[code][0]);
561 if(s->msmpeg4_version>=6 && s->qscale<=2)
562 extrabits = 3 - s->qscale;
565 put_bits(&s->pb, 8 + extrabits, level);
566 else if(extrabits > 0)//== VC1 && s->qscale<=2
567 put_bits(&s->pb, extrabits, extquant);
570 put_bits(&s->pb, 1, sign);
575 /* Encoding of a block; very similar to MPEG-4 except for a different
576 * escape coding (same as H.263) and more VLC tables. */
577 void ff_msmpeg4_encode_block(MpegEncContext * s, int16_t * block, int n)
579 int level, run, last, i, j, last_index;
580 int last_non_zero, sign, slevel;
581 int code, run_diff, dc_pred_dir;
583 const uint8_t *scantable;
586 msmpeg4_encode_dc(s, block[0], n, &dc_pred_dir);
589 rl = &ff_rl_table[s->rl_table_index];
591 rl = &ff_rl_table[3 + s->rl_chroma_table_index];
593 run_diff = s->msmpeg4_version>=4;
594 scantable= s->intra_scantable.permutated;
597 rl = &ff_rl_table[3 + s->rl_table_index];
598 if(s->msmpeg4_version<=2)
602 scantable= s->inter_scantable.permutated;
605 /* recalculate block_last_index for M$ wmv1 */
606 if(s->msmpeg4_version>=4 && s->msmpeg4_version<6 && s->block_last_index[n]>0){
607 for(last_index=63; last_index>=0; last_index--){
608 if(block[scantable[last_index]]) break;
610 s->block_last_index[n]= last_index;
612 last_index = s->block_last_index[n];
614 last_non_zero = i - 1;
615 for (; i <= last_index; i++) {
619 run = i - last_non_zero - 1;
620 last = (i == last_index);
628 if(level<=MAX_LEVEL && run<=MAX_RUN){
629 s->ac_stats[s->mb_intra][n>3][level][run][last]++;
632 s->ac_stats[s->mb_intra][n > 3][40][63][0]++; //esc3 like
634 code = get_rl_index(rl, last, run, level);
635 put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
639 level1 = level - rl->max_level[last][run];
642 code = get_rl_index(rl, last, run, level1);
645 put_bits(&s->pb, 1, 0);
646 if (level > MAX_LEVEL)
648 run1 = run - rl->max_run[last][level] - run_diff;
651 code = get_rl_index(rl, last, run1+1, level);
652 if (s->msmpeg4_version == 4 && code == rl->n)
654 code = get_rl_index(rl, last, run1, level);
658 put_bits(&s->pb, 1, 0);
659 put_bits(&s->pb, 1, last);
660 if(s->msmpeg4_version>=4){
661 if(s->esc3_level_length==0){
662 s->esc3_level_length=8;
663 s->esc3_run_length= 6;
664 //ESCLVLSZ + ESCRUNSZ
666 put_bits(&s->pb, 6 + (s->msmpeg4_version>=6), 3);
668 put_bits(&s->pb, 8, 3);
670 put_bits(&s->pb, s->esc3_run_length, run);
671 put_bits(&s->pb, 1, sign);
672 put_bits(&s->pb, s->esc3_level_length, level);
674 put_bits(&s->pb, 6, run);
675 put_sbits(&s->pb, 8, slevel);
679 put_bits(&s->pb, 1, 1);
680 put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
681 put_bits(&s->pb, 1, sign);
685 put_bits(&s->pb, 1, 1);
686 put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
687 put_bits(&s->pb, 1, sign);
690 put_bits(&s->pb, 1, sign);