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 FFmpeg.
10 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 "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 av_cold void init_mv_table(MVTable *tab, uint16_t table_mv_index[4096])
52 tab->table_mv_index = table_mv_index;
54 /* mark all entries as not used */
56 tab->table_mv_index[i] = MSMPEG4_MV_TABLES_NB_ELEMS;
58 for (i = 0; i < MSMPEG4_MV_TABLES_NB_ELEMS; i++) {
59 x = tab->table_mvx[i];
60 y = tab->table_mvy[i];
61 tab->table_mv_index[(x << 6) | y] = i;
65 void ff_msmpeg4_code012(PutBitContext *pb, int n)
71 put_bits(pb, 1, (n >= 2));
75 static int get_size_of_code(MpegEncContext * s, RLTable *rl, int last, int run, int level, int intra){
78 int run_diff= intra ? 0 : 1;
80 code = get_rl_index(rl, last, run, level);
81 size+= rl->table_vlc[code][1];
85 level1 = level - rl->max_level[last][run];
88 code = get_rl_index(rl, last, run, level1);
92 if (level > MAX_LEVEL)
94 run1 = run - rl->max_run[last][level] - run_diff;
97 code = get_rl_index(rl, last, run1, level);
104 size+= 1+1+ rl->table_vlc[code][1];
108 size+= 1+1+ rl->table_vlc[code][1];
116 av_cold void ff_msmpeg4_encode_init(MpegEncContext *s)
118 static int init_done=0;
121 ff_msmpeg4_common_init(s);
122 if(s->msmpeg4_version>=4){
128 static uint16_t mv_index_tables[2][4096];
129 /* init various encoding tables */
131 init_mv_table(&ff_mv_tables[0], mv_index_tables[0]);
132 init_mv_table(&ff_mv_tables[1], mv_index_tables[1]);
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 = 0, best_size = INT_MAX;
153 int chroma_best = 0, best_chroma_size = INT_MAX;
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 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 ff_dlog(s, "%d %"PRId64" %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 unsigned fps = s->avctx->time_base.den / s->avctx->time_base.num / FFMAX(s->avctx->ticks_per_frame, 1);
277 put_bits(&s->pb, 5, FFMIN(fps, 31)); //yes 29.97 -> 29
279 put_bits(&s->pb, 11, FFMIN(s->bit_rate/1024, 2047));
281 if(s->msmpeg4_version>=3)
282 put_bits(&s->pb, 1, s->flipflop_rounding);
284 av_assert0(s->flipflop_rounding==0);
287 void ff_msmpeg4_encode_motion(MpegEncContext * s,
293 /* modulo encoding */
294 /* WARNING : you cannot reach all the MVs even with the modulo
295 encoding. This is a somewhat strange compromise they took !!! */
307 mv = &ff_mv_tables[s->mv_table_index];
309 code = mv->table_mv_index[(mx << 6) | my];
311 mv->table_mv_bits[code],
312 mv->table_mv_code[code]);
313 if (code == MSMPEG4_MV_TABLES_NB_ELEMS) {
314 /* escape : code literally */
315 put_bits(&s->pb, 6, mx);
316 put_bits(&s->pb, 6, my);
320 void ff_msmpeg4_handle_slices(MpegEncContext *s){
322 if (s->slice_height && (s->mb_y % s->slice_height) == 0) {
323 if(s->msmpeg4_version < 4){
324 ff_mpeg4_clean_buffers(s);
326 s->first_slice_line = 1;
328 s->first_slice_line = 0;
333 static void msmpeg4v2_encode_motion(MpegEncContext * s, int val)
335 int range, bit_size, sign, code, bits;
340 put_bits(&s->pb, ff_mvtab[code][1], ff_mvtab[code][0]);
342 bit_size = s->f_code - 1;
343 range = 1 << bit_size;
356 code = (val >> bit_size) + 1;
357 bits = val & (range - 1);
359 put_bits(&s->pb, ff_mvtab[code][1] + 1, (ff_mvtab[code][0] << 1) | sign);
361 put_bits(&s->pb, bit_size, bits);
366 void ff_msmpeg4_encode_mb(MpegEncContext * s,
367 int16_t block[6][64],
368 int motion_x, int motion_y)
370 int cbp, coded_cbp, i;
372 uint8_t *coded_block;
374 ff_msmpeg4_handle_slices(s);
379 for (i = 0; i < 6; i++) {
380 if (s->block_last_index[i] >= 0)
383 if (s->use_skip_mb_code && (cbp | motion_x | motion_y) == 0) {
384 /* skip macroblock */
385 put_bits(&s->pb, 1, 1);
392 if (s->use_skip_mb_code)
393 put_bits(&s->pb, 1, 0); /* mb coded */
395 if(s->msmpeg4_version<=2){
397 ff_v2_mb_type[cbp&3][1],
398 ff_v2_mb_type[cbp&3][0]);
399 if((cbp&3) != 3) coded_cbp= cbp ^ 0x3C;
403 ff_h263_cbpy_tab[coded_cbp>>2][1],
404 ff_h263_cbpy_tab[coded_cbp>>2][0]);
406 s->misc_bits += get_bits_diff(s);
408 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
409 msmpeg4v2_encode_motion(s, motion_x - pred_x);
410 msmpeg4v2_encode_motion(s, motion_y - pred_y);
413 ff_table_mb_non_intra[cbp + 64][1],
414 ff_table_mb_non_intra[cbp + 64][0]);
416 s->misc_bits += get_bits_diff(s);
419 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
420 ff_msmpeg4_encode_motion(s, motion_x - pred_x,
424 s->mv_bits += get_bits_diff(s);
426 for (i = 0; i < 6; i++) {
427 ff_msmpeg4_encode_block(s, block[i], i);
429 s->p_tex_bits += get_bits_diff(s);
434 for (i = 0; i < 6; i++) {
436 val = (s->block_last_index[i] >= 1);
437 cbp |= val << (5 - i);
439 /* predict value for close blocks only for luma */
440 pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
444 coded_cbp |= val << (5 - i);
447 if(s->msmpeg4_version<=2){
448 if (s->pict_type == AV_PICTURE_TYPE_I) {
450 ff_v2_intra_cbpc[cbp&3][1], ff_v2_intra_cbpc[cbp&3][0]);
452 if (s->use_skip_mb_code)
453 put_bits(&s->pb, 1, 0); /* mb coded */
455 ff_v2_mb_type[(cbp&3) + 4][1],
456 ff_v2_mb_type[(cbp&3) + 4][0]);
458 put_bits(&s->pb, 1, 0); /* no AC prediction yet */
460 ff_h263_cbpy_tab[cbp>>2][1],
461 ff_h263_cbpy_tab[cbp>>2][0]);
463 if (s->pict_type == AV_PICTURE_TYPE_I) {
465 ff_msmp4_mb_i_table[coded_cbp][1], ff_msmp4_mb_i_table[coded_cbp][0]);
467 if (s->use_skip_mb_code)
468 put_bits(&s->pb, 1, 0); /* mb coded */
470 ff_table_mb_non_intra[cbp][1],
471 ff_table_mb_non_intra[cbp][0]);
473 put_bits(&s->pb, 1, 0); /* no AC prediction yet */
474 if(s->inter_intra_pred){
476 put_bits(&s->pb, ff_table_inter_intra[s->h263_aic_dir][1], ff_table_inter_intra[s->h263_aic_dir][0]);
479 s->misc_bits += get_bits_diff(s);
481 for (i = 0; i < 6; i++) {
482 ff_msmpeg4_encode_block(s, block[i], i);
484 s->i_tex_bits += get_bits_diff(s);
489 static void msmpeg4_encode_dc(MpegEncContext * s, int level, int n, int *dir_ptr)
495 pred = ff_msmpeg4_pred_dc(s, n, &dc_val, dir_ptr);
497 /* update predictor */
499 *dc_val = level * s->y_dc_scale;
501 *dc_val = level * s->c_dc_scale;
504 /* do the prediction */
507 if(s->msmpeg4_version<=2){
510 ff_v2_dc_lum_table[level + 256][1],
511 ff_v2_dc_lum_table[level + 256][0]);
514 ff_v2_dc_chroma_table[level + 256][1],
515 ff_v2_dc_chroma_table[level + 256][0]);
527 if (s->dc_table_index == 0) {
529 put_bits(&s->pb, ff_table0_dc_lum[code][1], ff_table0_dc_lum[code][0]);
531 put_bits(&s->pb, ff_table0_dc_chroma[code][1], ff_table0_dc_chroma[code][0]);
535 put_bits(&s->pb, ff_table1_dc_lum[code][1], ff_table1_dc_lum[code][0]);
537 put_bits(&s->pb, ff_table1_dc_chroma[code][1], ff_table1_dc_chroma[code][0]);
542 put_bits(&s->pb, 8, level);
545 put_bits(&s->pb, 1, sign);
550 /* Encoding of a block; very similar to MPEG-4 except for a different
551 * escape coding (same as H.263) and more VLC tables. */
552 void ff_msmpeg4_encode_block(MpegEncContext * s, int16_t * block, int n)
554 int level, run, last, i, j, last_index;
555 int last_non_zero, sign, slevel;
556 int code, run_diff, dc_pred_dir;
558 const uint8_t *scantable;
561 msmpeg4_encode_dc(s, block[0], n, &dc_pred_dir);
564 rl = &ff_rl_table[s->rl_table_index];
566 rl = &ff_rl_table[3 + s->rl_chroma_table_index];
568 run_diff = s->msmpeg4_version>=4;
569 scantable= s->intra_scantable.permutated;
572 rl = &ff_rl_table[3 + s->rl_table_index];
573 if(s->msmpeg4_version<=2)
577 scantable= s->inter_scantable.permutated;
580 /* recalculate block_last_index for M$ wmv1 */
581 if (s->msmpeg4_version >= 4 && s->block_last_index[n] > 0) {
582 for(last_index=63; last_index>=0; last_index--){
583 if(block[scantable[last_index]]) break;
585 s->block_last_index[n]= last_index;
587 last_index = s->block_last_index[n];
589 last_non_zero = i - 1;
590 for (; i <= last_index; i++) {
594 run = i - last_non_zero - 1;
595 last = (i == last_index);
603 if(level<=MAX_LEVEL && run<=MAX_RUN){
604 s->ac_stats[s->mb_intra][n>3][level][run][last]++;
607 s->ac_stats[s->mb_intra][n > 3][40][63][0]++; //esc3 like
609 code = get_rl_index(rl, last, run, level);
610 put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
614 level1 = level - rl->max_level[last][run];
617 code = get_rl_index(rl, last, run, level1);
620 put_bits(&s->pb, 1, 0);
621 if (level > MAX_LEVEL)
623 run1 = run - rl->max_run[last][level] - run_diff;
626 code = get_rl_index(rl, last, run1+1, level);
627 if (s->msmpeg4_version == 4 && code == rl->n)
629 code = get_rl_index(rl, last, run1, level);
633 put_bits(&s->pb, 1, 0);
634 put_bits(&s->pb, 1, last);
635 if(s->msmpeg4_version>=4){
636 if(s->esc3_level_length==0){
637 s->esc3_level_length=8;
638 s->esc3_run_length= 6;
639 //ESCLVLSZ + ESCRUNSZ
641 put_bits(&s->pb, 6, 3);
643 put_bits(&s->pb, 8, 3);
645 put_bits(&s->pb, s->esc3_run_length, run);
646 put_bits(&s->pb, 1, sign);
647 put_bits(&s->pb, s->esc3_level_length, level);
649 put_bits(&s->pb, 6, run);
650 put_sbits(&s->pb, 8, slevel);
654 put_bits(&s->pb, 1, 1);
655 put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
656 put_bits(&s->pb, 1, sign);
660 put_bits(&s->pb, 1, 1);
661 put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
662 put_bits(&s->pb, 1, sign);
665 put_bits(&s->pb, 1, sign);