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 "libavutil/thread.h"
36 #include "mpegvideo.h"
39 #include "mpeg4video.h"
41 #include "msmpeg4data.h"
46 static uint8_t rl_length[NB_RL_TABLES][MAX_LEVEL+1][MAX_RUN+1][2];
48 /* build the table which associate a (x,y) motion vector to a vlc */
49 static av_cold void init_mv_table(MVTable *tab, uint16_t table_mv_index[4096])
53 tab->table_mv_index = table_mv_index;
55 /* mark all entries as not used */
57 tab->table_mv_index[i] = MSMPEG4_MV_TABLES_NB_ELEMS;
59 for (i = 0; i < MSMPEG4_MV_TABLES_NB_ELEMS; i++) {
60 x = tab->table_mvx[i];
61 y = tab->table_mvy[i];
62 tab->table_mv_index[(x << 6) | y] = i;
66 void ff_msmpeg4_code012(PutBitContext *pb, int n)
72 put_bits(pb, 1, (n >= 2));
76 static int get_size_of_code(const RLTable *rl, int last, int run,
81 int run_diff= intra ? 0 : 1;
83 code = get_rl_index(rl, last, run, level);
84 size+= rl->table_vlc[code][1];
88 level1 = level - rl->max_level[last][run];
91 code = get_rl_index(rl, last, run, level1);
95 if (level > MAX_LEVEL)
97 run1 = run - rl->max_run[last][level] - run_diff;
100 code = get_rl_index(rl, last, run1, level);
107 size+= 1+1+ rl->table_vlc[code][1];
111 size+= 1+1+ rl->table_vlc[code][1];
119 static av_cold void msmpeg4_encode_init_static(void)
122 static uint16_t mv_index_tables[2][4096];
123 init_mv_table(&ff_mv_tables[0], mv_index_tables[0]);
124 init_mv_table(&ff_mv_tables[1], mv_index_tables[1]);
126 for(i=0; i<NB_RL_TABLES; i++){
128 for (level = 1; level <= MAX_LEVEL; level++) {
130 for(run=0; run<=MAX_RUN; run++){
132 for(last=0; last<2; last++){
133 rl_length[i][level][run][last] = get_size_of_code(&ff_rl_table[i], last, run, level, 0);
140 av_cold void ff_msmpeg4_encode_init(MpegEncContext *s)
142 static AVOnce init_static_once = AV_ONCE_INIT;
144 ff_msmpeg4_common_init(s);
145 if (s->msmpeg4_version >= 4) {
146 s->min_qcoeff = -255;
150 /* init various encoding tables */
151 ff_thread_once(&init_static_once, msmpeg4_encode_init_static);
154 static void find_best_tables(MpegEncContext * s)
157 int best = 0, best_size = INT_MAX;
158 int chroma_best = 0, best_chroma_size = INT_MAX;
169 for(level=0; level<=MAX_LEVEL; level++){
171 for(run=0; run<=MAX_RUN; run++){
173 const int last_size= size + chroma_size;
174 for(last=0; last<2; last++){
175 int inter_count = s->ac_stats[0][0][level][run][last] + s->ac_stats[0][1][level][run][last];
176 int intra_luma_count = s->ac_stats[1][0][level][run][last];
177 int intra_chroma_count= s->ac_stats[1][1][level][run][last];
179 if(s->pict_type==AV_PICTURE_TYPE_I){
180 size += intra_luma_count *rl_length[i ][level][run][last];
181 chroma_size+= intra_chroma_count*rl_length[i+3][level][run][last];
183 size+= intra_luma_count *rl_length[i ][level][run][last]
184 +intra_chroma_count*rl_length[i+3][level][run][last]
185 +inter_count *rl_length[i+3][level][run][last];
188 if(last_size == size+chroma_size) break;
195 if(chroma_size<best_chroma_size){
196 best_chroma_size= chroma_size;
201 if(s->pict_type==AV_PICTURE_TYPE_P) chroma_best= best;
203 memset(s->ac_stats, 0, sizeof(int)*(MAX_LEVEL+1)*(MAX_RUN+1)*2*2*2);
205 s->rl_table_index = best;
206 s->rl_chroma_table_index= chroma_best;
208 if(s->pict_type != s->last_non_b_pict_type){
209 s->rl_table_index= 2;
210 if(s->pict_type==AV_PICTURE_TYPE_I)
211 s->rl_chroma_table_index= 1;
213 s->rl_chroma_table_index= 2;
218 /* write MSMPEG4 compatible frame header */
219 void ff_msmpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
223 align_put_bits(&s->pb);
224 put_bits(&s->pb, 2, s->pict_type - 1);
226 put_bits(&s->pb, 5, s->qscale);
227 if(s->msmpeg4_version<=2){
228 s->rl_table_index = 2;
229 s->rl_chroma_table_index = 2;
232 s->dc_table_index = 1;
233 s->mv_table_index = 1; /* only if P-frame */
234 s->use_skip_mb_code = 1; /* only if P-frame */
235 s->per_mb_rl_table = 0;
236 if(s->msmpeg4_version==4)
237 s->inter_intra_pred= (s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE && s->pict_type==AV_PICTURE_TYPE_P);
238 ff_dlog(s, "%d %"PRId64" %d %d %d\n", s->pict_type, s->bit_rate,
239 s->inter_intra_pred, s->width, s->height);
241 if (s->pict_type == AV_PICTURE_TYPE_I) {
242 s->slice_height= s->mb_height/1;
243 put_bits(&s->pb, 5, 0x16 + s->mb_height/s->slice_height);
245 if(s->msmpeg4_version==4){
246 ff_msmpeg4_encode_ext_header(s);
247 if(s->bit_rate>MBAC_BITRATE)
248 put_bits(&s->pb, 1, s->per_mb_rl_table);
251 if(s->msmpeg4_version>2){
252 if(!s->per_mb_rl_table){
253 ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index);
254 ff_msmpeg4_code012(&s->pb, s->rl_table_index);
257 put_bits(&s->pb, 1, s->dc_table_index);
260 put_bits(&s->pb, 1, s->use_skip_mb_code);
262 if(s->msmpeg4_version==4 && s->bit_rate>MBAC_BITRATE)
263 put_bits(&s->pb, 1, s->per_mb_rl_table);
265 if(s->msmpeg4_version>2){
266 if(!s->per_mb_rl_table)
267 ff_msmpeg4_code012(&s->pb, s->rl_table_index);
269 put_bits(&s->pb, 1, s->dc_table_index);
271 put_bits(&s->pb, 1, s->mv_table_index);
275 s->esc3_level_length= 0;
276 s->esc3_run_length= 0;
279 void ff_msmpeg4_encode_ext_header(MpegEncContext * s)
281 unsigned fps = s->avctx->time_base.den / s->avctx->time_base.num / FFMAX(s->avctx->ticks_per_frame, 1);
282 put_bits(&s->pb, 5, FFMIN(fps, 31)); //yes 29.97 -> 29
284 put_bits(&s->pb, 11, FFMIN(s->bit_rate/1024, 2047));
286 if(s->msmpeg4_version>=3)
287 put_bits(&s->pb, 1, s->flipflop_rounding);
289 av_assert0(s->flipflop_rounding==0);
292 void ff_msmpeg4_encode_motion(MpegEncContext * s,
298 /* modulo encoding */
299 /* WARNING : you cannot reach all the MVs even with the modulo
300 encoding. This is a somewhat strange compromise they took !!! */
312 mv = &ff_mv_tables[s->mv_table_index];
314 code = mv->table_mv_index[(mx << 6) | my];
316 mv->table_mv_bits[code],
317 mv->table_mv_code[code]);
318 if (code == MSMPEG4_MV_TABLES_NB_ELEMS) {
319 /* escape : code literally */
320 put_bits(&s->pb, 6, mx);
321 put_bits(&s->pb, 6, my);
325 void ff_msmpeg4_handle_slices(MpegEncContext *s){
327 if (s->slice_height && (s->mb_y % s->slice_height) == 0) {
328 if(s->msmpeg4_version < 4){
329 ff_mpeg4_clean_buffers(s);
331 s->first_slice_line = 1;
333 s->first_slice_line = 0;
338 static void msmpeg4v2_encode_motion(MpegEncContext * s, int val)
340 int range, bit_size, sign, code, bits;
345 put_bits(&s->pb, ff_mvtab[code][1], ff_mvtab[code][0]);
347 bit_size = s->f_code - 1;
348 range = 1 << bit_size;
361 code = (val >> bit_size) + 1;
362 bits = val & (range - 1);
364 put_bits(&s->pb, ff_mvtab[code][1] + 1, (ff_mvtab[code][0] << 1) | sign);
366 put_bits(&s->pb, bit_size, bits);
371 void ff_msmpeg4_encode_mb(MpegEncContext * s,
372 int16_t block[6][64],
373 int motion_x, int motion_y)
375 int cbp, coded_cbp, i;
377 uint8_t *coded_block;
379 ff_msmpeg4_handle_slices(s);
384 for (i = 0; i < 6; i++) {
385 if (s->block_last_index[i] >= 0)
388 if (s->use_skip_mb_code && (cbp | motion_x | motion_y) == 0) {
389 /* skip macroblock */
390 put_bits(&s->pb, 1, 1);
397 if (s->use_skip_mb_code)
398 put_bits(&s->pb, 1, 0); /* mb coded */
400 if(s->msmpeg4_version<=2){
402 ff_v2_mb_type[cbp&3][1],
403 ff_v2_mb_type[cbp&3][0]);
404 if((cbp&3) != 3) coded_cbp= cbp ^ 0x3C;
408 ff_h263_cbpy_tab[coded_cbp>>2][1],
409 ff_h263_cbpy_tab[coded_cbp>>2][0]);
411 s->misc_bits += get_bits_diff(s);
413 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
414 msmpeg4v2_encode_motion(s, motion_x - pred_x);
415 msmpeg4v2_encode_motion(s, motion_y - pred_y);
418 ff_table_mb_non_intra[cbp + 64][1],
419 ff_table_mb_non_intra[cbp + 64][0]);
421 s->misc_bits += get_bits_diff(s);
424 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
425 ff_msmpeg4_encode_motion(s, motion_x - pred_x,
429 s->mv_bits += get_bits_diff(s);
431 for (i = 0; i < 6; i++) {
432 ff_msmpeg4_encode_block(s, block[i], i);
434 s->p_tex_bits += get_bits_diff(s);
439 for (i = 0; i < 6; i++) {
441 val = (s->block_last_index[i] >= 1);
442 cbp |= val << (5 - i);
444 /* predict value for close blocks only for luma */
445 pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
449 coded_cbp |= val << (5 - i);
452 if(s->msmpeg4_version<=2){
453 if (s->pict_type == AV_PICTURE_TYPE_I) {
455 ff_v2_intra_cbpc[cbp&3][1], ff_v2_intra_cbpc[cbp&3][0]);
457 if (s->use_skip_mb_code)
458 put_bits(&s->pb, 1, 0); /* mb coded */
460 ff_v2_mb_type[(cbp&3) + 4][1],
461 ff_v2_mb_type[(cbp&3) + 4][0]);
463 put_bits(&s->pb, 1, 0); /* no AC prediction yet */
465 ff_h263_cbpy_tab[cbp>>2][1],
466 ff_h263_cbpy_tab[cbp>>2][0]);
468 if (s->pict_type == AV_PICTURE_TYPE_I) {
470 ff_msmp4_mb_i_table[coded_cbp][1], ff_msmp4_mb_i_table[coded_cbp][0]);
472 if (s->use_skip_mb_code)
473 put_bits(&s->pb, 1, 0); /* mb coded */
475 ff_table_mb_non_intra[cbp][1],
476 ff_table_mb_non_intra[cbp][0]);
478 put_bits(&s->pb, 1, 0); /* no AC prediction yet */
479 if(s->inter_intra_pred){
481 put_bits(&s->pb, ff_table_inter_intra[s->h263_aic_dir][1], ff_table_inter_intra[s->h263_aic_dir][0]);
484 s->misc_bits += get_bits_diff(s);
486 for (i = 0; i < 6; i++) {
487 ff_msmpeg4_encode_block(s, block[i], i);
489 s->i_tex_bits += get_bits_diff(s);
494 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]);
532 if (s->dc_table_index == 0) {
534 put_bits(&s->pb, ff_table0_dc_lum[code][1], ff_table0_dc_lum[code][0]);
536 put_bits(&s->pb, ff_table0_dc_chroma[code][1], ff_table0_dc_chroma[code][0]);
540 put_bits(&s->pb, ff_table1_dc_lum[code][1], ff_table1_dc_lum[code][0]);
542 put_bits(&s->pb, ff_table1_dc_chroma[code][1], ff_table1_dc_chroma[code][0]);
547 put_bits(&s->pb, 8, level);
550 put_bits(&s->pb, 1, sign);
555 /* Encoding of a block; very similar to MPEG-4 except for a different
556 * escape coding (same as H.263) and more VLC tables. */
557 void ff_msmpeg4_encode_block(MpegEncContext * s, int16_t * block, int n)
559 int level, run, last, i, j, last_index;
560 int last_non_zero, sign, slevel;
561 int code, run_diff, dc_pred_dir;
563 const uint8_t *scantable;
566 msmpeg4_encode_dc(s, block[0], n, &dc_pred_dir);
569 rl = &ff_rl_table[s->rl_table_index];
571 rl = &ff_rl_table[3 + s->rl_chroma_table_index];
573 run_diff = s->msmpeg4_version>=4;
574 scantable= s->intra_scantable.permutated;
577 rl = &ff_rl_table[3 + s->rl_table_index];
578 if(s->msmpeg4_version<=2)
582 scantable= s->inter_scantable.permutated;
585 /* recalculate block_last_index for M$ wmv1 */
586 if (s->msmpeg4_version >= 4 && s->block_last_index[n] > 0) {
587 for(last_index=63; last_index>=0; last_index--){
588 if(block[scantable[last_index]]) break;
590 s->block_last_index[n]= last_index;
592 last_index = s->block_last_index[n];
594 last_non_zero = i - 1;
595 for (; i <= last_index; i++) {
599 run = i - last_non_zero - 1;
600 last = (i == last_index);
608 if(level<=MAX_LEVEL && run<=MAX_RUN){
609 s->ac_stats[s->mb_intra][n>3][level][run][last]++;
612 s->ac_stats[s->mb_intra][n > 3][40][63][0]++; //esc3 like
614 code = get_rl_index(rl, last, run, level);
615 put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
619 level1 = level - rl->max_level[last][run];
622 code = get_rl_index(rl, last, run, level1);
625 put_bits(&s->pb, 1, 0);
626 if (level > MAX_LEVEL)
628 run1 = run - rl->max_run[last][level] - run_diff;
631 code = get_rl_index(rl, last, run1+1, level);
632 if (s->msmpeg4_version == 4 && code == rl->n)
634 code = get_rl_index(rl, last, run1, level);
638 put_bits(&s->pb, 1, 0);
639 put_bits(&s->pb, 1, last);
640 if(s->msmpeg4_version>=4){
641 if(s->esc3_level_length==0){
642 s->esc3_level_length=8;
643 s->esc3_run_length= 6;
644 //ESCLVLSZ + ESCRUNSZ
646 put_bits(&s->pb, 6, 3);
648 put_bits(&s->pb, 8, 3);
650 put_bits(&s->pb, s->esc3_run_length, run);
651 put_bits(&s->pb, 1, sign);
652 put_bits(&s->pb, s->esc3_level_length, level);
654 put_bits(&s->pb, 6, run);
655 put_sbits(&s->pb, 8, slevel);
659 put_bits(&s->pb, 1, 1);
660 put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
661 put_bits(&s->pb, 1, sign);
665 put_bits(&s->pb, 1, 1);
666 put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
667 put_bits(&s->pb, 1, sign);
670 put_bits(&s->pb, 1, sign);