3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "mpegvideo.h"
24 #include "mpeg4video.h"
27 // The defines below define the number of bits that are read at once for
28 // reading vlc values. Changing these may improve speed and data cache needs
29 // be aware though that decreasing them may need the number of stages that is
30 // passed to get_vlc* to be increased.
31 #define SPRITE_TRAJ_VLC_BITS 6
33 #define MB_TYPE_B_VLC_BITS 4
36 static VLC dc_lum, dc_chrom;
37 static VLC sprite_trajectory;
38 static VLC mb_type_b_vlc;
40 static const int mb_type_b_map[4]= {
41 MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
42 MB_TYPE_L0L1 | MB_TYPE_16x16,
43 MB_TYPE_L1 | MB_TYPE_16x16,
44 MB_TYPE_L0 | MB_TYPE_16x16,
49 * @param n block index (0-3 are luma, 4-5 are chroma)
50 * @param dir the ac prediction direction
52 void mpeg4_pred_ac(MpegEncContext * s, DCTELEM *block, int n,
56 int16_t *ac_val, *ac_val1;
57 int8_t * const qscale_table= s->current_picture.qscale_table;
60 ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
64 const int xy= s->mb_x-1 + s->mb_y*s->mb_stride;
68 if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){
71 block[s->dsp.idct_permutation[i<<3]] += ac_val[i];
74 /* different qscale, we must rescale */
76 block[s->dsp.idct_permutation[i<<3]] += ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale);
80 const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride;
82 ac_val -= 16 * s->block_wrap[n];
84 if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
87 block[s->dsp.idct_permutation[i]] += ac_val[i + 8];
90 /* different qscale, we must rescale */
92 block[s->dsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale);
99 ac_val1[i ] = block[s->dsp.idct_permutation[i<<3]];
103 ac_val1[8 + i] = block[s->dsp.idct_permutation[i ]];
108 * check if the next stuff is a resync marker or the end.
111 static inline int mpeg4_is_resync(MpegEncContext *s){
112 int bits_count= get_bits_count(&s->gb);
113 int v= show_bits(&s->gb, 16);
115 if(s->workaround_bugs&FF_BUG_NO_PADDING){
120 if(s->pict_type==FF_B_TYPE || (v>>(8-s->pict_type)!=1) || s->partitioned_frame)
122 skip_bits(&s->gb, 8+s->pict_type);
123 bits_count+= 8+s->pict_type;
124 v= show_bits(&s->gb, 16);
127 if(bits_count + 8 >= s->gb.size_in_bits){
129 v|= 0x7F >> (7-(bits_count&7));
134 if(v == ff_mpeg4_resync_prefix[bits_count&7]){
136 GetBitContext gb= s->gb;
138 skip_bits(&s->gb, 1);
139 align_get_bits(&s->gb);
141 for(len=0; len<32; len++){
142 if(get_bits1(&s->gb)) break;
147 if(len>=ff_mpeg4_get_video_packet_prefix_length(s))
154 static void mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb)
157 int a= 2<<s->sprite_warping_accuracy;
158 int rho= 3-s->sprite_warping_accuracy;
160 const int vop_ref[4][2]= {{0,0}, {s->width,0}, {0, s->height}, {s->width, s->height}}; // only true for rectangle shapes
161 int d[4][2]={{0,0}, {0,0}, {0,0}, {0,0}};
162 int sprite_ref[4][2];
163 int virtual_ref[2][2];
170 for(i=0; i<s->num_sprite_warping_points; i++){
174 length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
176 x= get_xbits(gb, length);
178 if(!(s->divx_version==500 && s->divx_build==413)) skip_bits1(gb); /* marker bit */
180 length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
182 y=get_xbits(gb, length);
184 skip_bits1(gb); /* marker bit */
185 s->sprite_traj[i][0]= d[i][0]= x;
186 s->sprite_traj[i][1]= d[i][1]= y;
189 s->sprite_traj[i][0]= s->sprite_traj[i][1]= 0;
191 while((1<<alpha)<w) alpha++;
192 while((1<<beta )<h) beta++; // there seems to be a typo in the mpeg4 std for the definition of w' and h'
196 // Note, the 4th point isn't used for GMC
197 if(s->divx_version==500 && s->divx_build==413){
198 sprite_ref[0][0]= a*vop_ref[0][0] + d[0][0];
199 sprite_ref[0][1]= a*vop_ref[0][1] + d[0][1];
200 sprite_ref[1][0]= a*vop_ref[1][0] + d[0][0] + d[1][0];
201 sprite_ref[1][1]= a*vop_ref[1][1] + d[0][1] + d[1][1];
202 sprite_ref[2][0]= a*vop_ref[2][0] + d[0][0] + d[2][0];
203 sprite_ref[2][1]= a*vop_ref[2][1] + d[0][1] + d[2][1];
205 sprite_ref[0][0]= (a>>1)*(2*vop_ref[0][0] + d[0][0]);
206 sprite_ref[0][1]= (a>>1)*(2*vop_ref[0][1] + d[0][1]);
207 sprite_ref[1][0]= (a>>1)*(2*vop_ref[1][0] + d[0][0] + d[1][0]);
208 sprite_ref[1][1]= (a>>1)*(2*vop_ref[1][1] + d[0][1] + d[1][1]);
209 sprite_ref[2][0]= (a>>1)*(2*vop_ref[2][0] + d[0][0] + d[2][0]);
210 sprite_ref[2][1]= (a>>1)*(2*vop_ref[2][1] + d[0][1] + d[2][1]);
212 /* sprite_ref[3][0]= (a>>1)*(2*vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
213 sprite_ref[3][1]= (a>>1)*(2*vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
215 // this is mostly identical to the mpeg4 std (and is totally unreadable because of that ...)
216 // perhaps it should be reordered to be more readable ...
217 // the idea behind this virtual_ref mess is to be able to use shifts later per pixel instead of divides
218 // so the distance between points is converted from w&h based to w2&h2 based which are of the 2^x form
219 virtual_ref[0][0]= 16*(vop_ref[0][0] + w2)
220 + ROUNDED_DIV(((w - w2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + w2*(r*sprite_ref[1][0] - 16*vop_ref[1][0])),w);
221 virtual_ref[0][1]= 16*vop_ref[0][1]
222 + ROUNDED_DIV(((w - w2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + w2*(r*sprite_ref[1][1] - 16*vop_ref[1][1])),w);
223 virtual_ref[1][0]= 16*vop_ref[0][0]
224 + ROUNDED_DIV(((h - h2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + h2*(r*sprite_ref[2][0] - 16*vop_ref[2][0])),h);
225 virtual_ref[1][1]= 16*(vop_ref[0][1] + h2)
226 + ROUNDED_DIV(((h - h2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + h2*(r*sprite_ref[2][1] - 16*vop_ref[2][1])),h);
228 switch(s->num_sprite_warping_points)
231 s->sprite_offset[0][0]= 0;
232 s->sprite_offset[0][1]= 0;
233 s->sprite_offset[1][0]= 0;
234 s->sprite_offset[1][1]= 0;
235 s->sprite_delta[0][0]= a;
236 s->sprite_delta[0][1]= 0;
237 s->sprite_delta[1][0]= 0;
238 s->sprite_delta[1][1]= a;
239 s->sprite_shift[0]= 0;
240 s->sprite_shift[1]= 0;
243 s->sprite_offset[0][0]= sprite_ref[0][0] - a*vop_ref[0][0];
244 s->sprite_offset[0][1]= sprite_ref[0][1] - a*vop_ref[0][1];
245 s->sprite_offset[1][0]= ((sprite_ref[0][0]>>1)|(sprite_ref[0][0]&1)) - a*(vop_ref[0][0]/2);
246 s->sprite_offset[1][1]= ((sprite_ref[0][1]>>1)|(sprite_ref[0][1]&1)) - a*(vop_ref[0][1]/2);
247 s->sprite_delta[0][0]= a;
248 s->sprite_delta[0][1]= 0;
249 s->sprite_delta[1][0]= 0;
250 s->sprite_delta[1][1]= a;
251 s->sprite_shift[0]= 0;
252 s->sprite_shift[1]= 0;
255 s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+rho))
256 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][0])
257 + ( r*sprite_ref[0][1] - virtual_ref[0][1])*(-vop_ref[0][1])
258 + (1<<(alpha+rho-1));
259 s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+rho))
260 + (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-vop_ref[0][0])
261 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][1])
262 + (1<<(alpha+rho-1));
263 s->sprite_offset[1][0]= ( (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][0] + 1)
264 +( r*sprite_ref[0][1] - virtual_ref[0][1])*(-2*vop_ref[0][1] + 1)
265 +2*w2*r*sprite_ref[0][0]
267 + (1<<(alpha+rho+1)));
268 s->sprite_offset[1][1]= ( (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-2*vop_ref[0][0] + 1)
269 +(-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][1] + 1)
270 +2*w2*r*sprite_ref[0][1]
272 + (1<<(alpha+rho+1)));
273 s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
274 s->sprite_delta[0][1]= (+r*sprite_ref[0][1] - virtual_ref[0][1]);
275 s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1]);
276 s->sprite_delta[1][1]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
278 s->sprite_shift[0]= alpha+rho;
279 s->sprite_shift[1]= alpha+rho+2;
282 min_ab= FFMIN(alpha, beta);
285 s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+beta+rho-min_ab))
286 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-vop_ref[0][0])
287 + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-vop_ref[0][1])
288 + (1<<(alpha+beta+rho-min_ab-1));
289 s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+beta+rho-min_ab))
290 + (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-vop_ref[0][0])
291 + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-vop_ref[0][1])
292 + (1<<(alpha+beta+rho-min_ab-1));
293 s->sprite_offset[1][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-2*vop_ref[0][0] + 1)
294 + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-2*vop_ref[0][1] + 1)
295 + 2*w2*h3*r*sprite_ref[0][0]
297 + (1<<(alpha+beta+rho-min_ab+1));
298 s->sprite_offset[1][1]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-2*vop_ref[0][0] + 1)
299 + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-2*vop_ref[0][1] + 1)
300 + 2*w2*h3*r*sprite_ref[0][1]
302 + (1<<(alpha+beta+rho-min_ab+1));
303 s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3;
304 s->sprite_delta[0][1]= (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3;
305 s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3;
306 s->sprite_delta[1][1]= (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3;
308 s->sprite_shift[0]= alpha + beta + rho - min_ab;
309 s->sprite_shift[1]= alpha + beta + rho - min_ab + 2;
312 /* try to simplify the situation */
313 if( s->sprite_delta[0][0] == a<<s->sprite_shift[0]
314 && s->sprite_delta[0][1] == 0
315 && s->sprite_delta[1][0] == 0
316 && s->sprite_delta[1][1] == a<<s->sprite_shift[0])
318 s->sprite_offset[0][0]>>=s->sprite_shift[0];
319 s->sprite_offset[0][1]>>=s->sprite_shift[0];
320 s->sprite_offset[1][0]>>=s->sprite_shift[1];
321 s->sprite_offset[1][1]>>=s->sprite_shift[1];
322 s->sprite_delta[0][0]= a;
323 s->sprite_delta[0][1]= 0;
324 s->sprite_delta[1][0]= 0;
325 s->sprite_delta[1][1]= a;
326 s->sprite_shift[0]= 0;
327 s->sprite_shift[1]= 0;
328 s->real_sprite_warping_points=1;
331 int shift_y= 16 - s->sprite_shift[0];
332 int shift_c= 16 - s->sprite_shift[1];
334 s->sprite_offset[0][i]<<= shift_y;
335 s->sprite_offset[1][i]<<= shift_c;
336 s->sprite_delta[0][i]<<= shift_y;
337 s->sprite_delta[1][i]<<= shift_y;
338 s->sprite_shift[i]= 16;
340 s->real_sprite_warping_points= s->num_sprite_warping_points;
345 * decodes the next video packet.
346 * @return <0 if something went wrong
348 int mpeg4_decode_video_packet_header(MpegEncContext *s)
350 int mb_num_bits= av_log2(s->mb_num - 1) + 1;
351 int header_extension=0, mb_num, len;
353 /* is there enough space left for a video packet + header */
354 if( get_bits_count(&s->gb) > s->gb.size_in_bits-20) return -1;
356 for(len=0; len<32; len++){
357 if(get_bits1(&s->gb)) break;
360 if(len!=ff_mpeg4_get_video_packet_prefix_length(s)){
361 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
365 if(s->shape != RECT_SHAPE){
366 header_extension= get_bits1(&s->gb);
367 //FIXME more stuff here
370 mb_num= get_bits(&s->gb, mb_num_bits);
371 if(mb_num>=s->mb_num){
372 av_log(s->avctx, AV_LOG_ERROR, "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
375 if(s->pict_type == FF_B_TYPE){
376 while(s->next_picture.mbskip_table[ s->mb_index2xy[ mb_num ] ]) mb_num++;
377 if(mb_num >= s->mb_num) return -1; // slice contains just skipped MBs which where already decoded
380 s->mb_x= mb_num % s->mb_width;
381 s->mb_y= mb_num / s->mb_width;
383 if(s->shape != BIN_ONLY_SHAPE){
384 int qscale= get_bits(&s->gb, s->quant_precision);
386 s->chroma_qscale=s->qscale= qscale;
389 if(s->shape == RECT_SHAPE){
390 header_extension= get_bits1(&s->gb);
392 if(header_extension){
396 while (get_bits1(&s->gb) != 0)
399 check_marker(&s->gb, "before time_increment in video packed header");
400 time_increment= get_bits(&s->gb, s->time_increment_bits);
401 check_marker(&s->gb, "before vop_coding_type in video packed header");
403 skip_bits(&s->gb, 2); /* vop coding type */
404 //FIXME not rect stuff here
406 if(s->shape != BIN_ONLY_SHAPE){
407 skip_bits(&s->gb, 3); /* intra dc vlc threshold */
408 //FIXME don't just ignore everything
409 if(s->pict_type == FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){
410 mpeg4_decode_sprite_trajectory(s, &s->gb);
411 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
414 //FIXME reduced res stuff here
416 if (s->pict_type != FF_I_TYPE) {
417 int f_code = get_bits(&s->gb, 3); /* fcode_for */
419 av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (f_code=0)\n");
422 if (s->pict_type == FF_B_TYPE) {
423 int b_code = get_bits(&s->gb, 3);
425 av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (b_code=0)\n");
430 //FIXME new-pred stuff
436 * gets the average motion vector for a GMC MB.
437 * @param n either 0 for the x component or 1 for y
438 * @return the average MV for a GMC MB
440 static inline int get_amv(MpegEncContext *s, int n){
441 int x, y, mb_v, sum, dx, dy, shift;
442 int len = 1 << (s->f_code + 4);
443 const int a= s->sprite_warping_accuracy;
445 if(s->workaround_bugs & FF_BUG_AMV)
446 len >>= s->quarter_sample;
448 if(s->real_sprite_warping_points==1){
449 if(s->divx_version==500 && s->divx_build==413)
450 sum= s->sprite_offset[0][n] / (1<<(a - s->quarter_sample));
452 sum= RSHIFT(s->sprite_offset[0][n]<<s->quarter_sample, a);
454 dx= s->sprite_delta[n][0];
455 dy= s->sprite_delta[n][1];
456 shift= s->sprite_shift[0];
457 if(n) dy -= 1<<(shift + a + 1);
458 else dx -= 1<<(shift + a + 1);
459 mb_v= s->sprite_offset[0][n] + dx*s->mb_x*16 + dy*s->mb_y*16;
472 sum= RSHIFT(sum, a+8-s->quarter_sample);
475 if (sum < -len) sum= -len;
476 else if (sum >= len) sum= len-1;
482 * decodes the dc value.
483 * @param n block index (0-3 are luma, 4-5 are chroma)
484 * @param dir_ptr the prediction direction will be stored here
485 * @return the quantized dc
487 static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
492 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
494 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
495 if (code < 0 || code > 9 /* && s->nbit<9 */){
496 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
504 level= 2*get_bits1(&s->gb)-1;
506 if(get_bits1(&s->gb))
507 level = get_bits(&s->gb, code-1) + (1<<(code-1));
509 level = -get_bits(&s->gb, code-1) - (1<<(code-1));
512 level = get_xbits(&s->gb, code);
516 if(get_bits1(&s->gb)==0){ /* marker */
517 if(s->error_recognition>=2){
518 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
525 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
529 * decodes first partition.
530 * @return number of MBs decoded or <0 if an error occurred
532 static int mpeg4_decode_partition_a(MpegEncContext *s){
534 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
536 /* decode first partition */
538 s->first_slice_line=1;
539 for(; s->mb_y<s->mb_height; s->mb_y++){
540 ff_init_block_index(s);
541 for(; s->mb_x<s->mb_width; s->mb_x++){
542 const int xy= s->mb_x + s->mb_y*s->mb_stride;
547 ff_update_block_index(s);
548 if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
549 s->first_slice_line=0;
551 if(s->pict_type==FF_I_TYPE){
555 if(show_bits_long(&s->gb, 19)==DC_MARKER){
559 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
561 av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
566 s->cbp_table[xy]= cbpc & 3;
567 s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
571 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
573 s->current_picture.qscale_table[xy]= s->qscale;
575 s->mbintra_table[xy]= 1;
578 int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
580 av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
584 if(dc_pred_dir) dir|=1;
586 s->pred_dir_table[xy]= dir;
587 }else{ /* P/S_TYPE */
588 int mx, my, pred_x, pred_y, bits;
589 int16_t * const mot_val= s->current_picture.motion_val[0][s->block_index[0]];
590 const int stride= s->b8_stride*2;
593 bits= show_bits(&s->gb, 17);
594 if(bits==MOTION_MARKER){
600 if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){
601 s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
605 s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
608 mot_val[0 ]= mot_val[2 ]=
609 mot_val[0+stride]= mot_val[2+stride]= mx;
610 mot_val[1 ]= mot_val[3 ]=
611 mot_val[1+stride]= mot_val[3+stride]= my;
613 if(s->mbintra_table[xy])
614 ff_clean_intra_table_entries(s);
618 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
620 av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
626 s->cbp_table[xy]= cbpc&(8+3); //8 is dquant
628 s->mb_intra = ((cbpc & 4) != 0);
631 s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
632 s->mbintra_table[xy]= 1;
633 mot_val[0 ]= mot_val[2 ]=
634 mot_val[0+stride]= mot_val[2+stride]= 0;
635 mot_val[1 ]= mot_val[3 ]=
636 mot_val[1+stride]= mot_val[3+stride]= 0;
638 if(s->mbintra_table[xy])
639 ff_clean_intra_table_entries(s);
641 if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
642 s->mcsel= get_bits1(&s->gb);
645 if ((cbpc & 16) == 0) {
646 /* 16x16 motion prediction */
648 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
650 mx = h263_decode_motion(s, pred_x, s->f_code);
654 my = h263_decode_motion(s, pred_y, s->f_code);
657 s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0;
661 s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
664 mot_val[0 ]= mot_val[2 ] =
665 mot_val[0+stride]= mot_val[2+stride]= mx;
666 mot_val[1 ]= mot_val[3 ]=
667 mot_val[1+stride]= mot_val[3+stride]= my;
670 s->current_picture.mb_type[xy]= MB_TYPE_8x8 | MB_TYPE_L0;
672 int16_t *mot_val= h263_pred_motion(s, i, 0, &pred_x, &pred_y);
673 mx = h263_decode_motion(s, pred_x, s->f_code);
677 my = h263_decode_motion(s, pred_y, s->f_code);
694 * decode second partition.
695 * @return <0 if an error occurred
697 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count){
699 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
701 s->mb_x= s->resync_mb_x;
702 s->first_slice_line=1;
703 for(s->mb_y= s->resync_mb_y; mb_num < mb_count; s->mb_y++){
704 ff_init_block_index(s);
705 for(; mb_num < mb_count && s->mb_x<s->mb_width; s->mb_x++){
706 const int xy= s->mb_x + s->mb_y*s->mb_stride;
709 ff_update_block_index(s);
710 if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
711 s->first_slice_line=0;
713 if(s->pict_type==FF_I_TYPE){
714 int ac_pred= get_bits1(&s->gb);
715 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
717 av_log(s->avctx, AV_LOG_ERROR, "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
721 s->cbp_table[xy]|= cbpy<<2;
722 s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
723 }else{ /* P || S_TYPE */
724 if(IS_INTRA(s->current_picture.mb_type[xy])){
726 int ac_pred = get_bits1(&s->gb);
727 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
730 av_log(s->avctx, AV_LOG_ERROR, "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
734 if(s->cbp_table[xy] & 8) {
735 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
737 s->current_picture.qscale_table[xy]= s->qscale;
741 int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
743 av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
747 if(dc_pred_dir) dir|=1;
749 s->cbp_table[xy]&= 3; //remove dquant
750 s->cbp_table[xy]|= cbpy<<2;
751 s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
752 s->pred_dir_table[xy]= dir;
753 }else if(IS_SKIP(s->current_picture.mb_type[xy])){
754 s->current_picture.qscale_table[xy]= s->qscale;
757 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
760 av_log(s->avctx, AV_LOG_ERROR, "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
764 if(s->cbp_table[xy] & 8) {
765 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
767 s->current_picture.qscale_table[xy]= s->qscale;
769 s->cbp_table[xy]&= 3; //remove dquant
770 s->cbp_table[xy]|= (cbpy^0xf)<<2;
774 if(mb_num >= mb_count) return 0;
781 * decodes the first & second partition
782 * @return <0 if error (and sets error type in the error_status_table)
784 int ff_mpeg4_decode_partitions(MpegEncContext *s)
787 const int part_a_error= s->pict_type==FF_I_TYPE ? (DC_ERROR|MV_ERROR) : MV_ERROR;
788 const int part_a_end = s->pict_type==FF_I_TYPE ? (DC_END |MV_END) : MV_END;
790 mb_num= mpeg4_decode_partition_a(s);
792 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
796 if(s->resync_mb_x + s->resync_mb_y*s->mb_width + mb_num > s->mb_num){
797 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
798 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
802 s->mb_num_left= mb_num;
804 if(s->pict_type==FF_I_TYPE){
805 while(show_bits(&s->gb, 9) == 1)
806 skip_bits(&s->gb, 9);
807 if(get_bits_long(&s->gb, 19)!=DC_MARKER){
808 av_log(s->avctx, AV_LOG_ERROR, "marker missing after first I partition at %d %d\n", s->mb_x, s->mb_y);
812 while(show_bits(&s->gb, 10) == 1)
813 skip_bits(&s->gb, 10);
814 if(get_bits(&s->gb, 17)!=MOTION_MARKER){
815 av_log(s->avctx, AV_LOG_ERROR, "marker missing after first P partition at %d %d\n", s->mb_x, s->mb_y);
819 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, part_a_end);
821 if( mpeg4_decode_partition_b(s, mb_num) < 0){
822 if(s->pict_type==FF_P_TYPE)
823 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, DC_ERROR);
826 if(s->pict_type==FF_P_TYPE)
827 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, DC_END);
835 * @return <0 if an error occurred
837 static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
838 int n, int coded, int intra, int rvlc)
840 int level, i, last, run;
843 RL_VLC_ELEM * rl_vlc;
844 const uint8_t * scan_table;
847 //Note intra & rvlc should be optimized away if this is inlined
850 if(s->use_intra_dc_vlc){
852 if(s->partitioned_frame){
853 level = s->dc_val[0][ s->block_index[n] ];
854 if(n<4) level= FASTDIV((level + (s->y_dc_scale>>1)), s->y_dc_scale);
855 else level= FASTDIV((level + (s->c_dc_scale>>1)), s->c_dc_scale);
856 dc_pred_dir= (s->pred_dir_table[s->mb_x + s->mb_y*s->mb_stride]<<n)&32;
858 level = mpeg4_decode_dc(s, n, &dc_pred_dir);
866 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
873 rl_vlc = rvlc_rl_intra.rl_vlc[0];
875 rl = &ff_mpeg4_rl_intra;
876 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
879 if (dc_pred_dir == 0)
880 scan_table = s->intra_v_scantable.permutated; /* left */
882 scan_table = s->intra_h_scantable.permutated; /* top */
884 scan_table = s->intra_scantable.permutated;
891 s->block_last_index[n] = i;
894 if(rvlc) rl = &rvlc_rl_inter;
895 else rl = &ff_h263_rl_inter;
897 scan_table = s->intra_scantable.permutated;
903 rl_vlc = rvlc_rl_inter.rl_vlc[0];
905 rl_vlc = ff_h263_rl_inter.rl_vlc[0];
908 qmul = s->qscale << 1;
909 qadd = (s->qscale - 1) | 1;
911 rl_vlc = rvlc_rl_inter.rl_vlc[s->qscale];
913 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
918 OPEN_READER(re, &s->gb);
920 UPDATE_CACHE(re, &s->gb);
921 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
925 if(SHOW_UBITS(re, &s->gb, 1)==0){
926 av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in rvlc esc\n");
928 }; SKIP_CACHE(re, &s->gb, 1);
930 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
931 run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6);
932 SKIP_COUNTER(re, &s->gb, 1+1+6);
933 UPDATE_CACHE(re, &s->gb);
935 if(SHOW_UBITS(re, &s->gb, 1)==0){
936 av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in rvlc esc\n");
938 }; SKIP_CACHE(re, &s->gb, 1);
940 level= SHOW_UBITS(re, &s->gb, 11); SKIP_CACHE(re, &s->gb, 11);
942 if(SHOW_UBITS(re, &s->gb, 5)!=0x10){
943 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
945 }; SKIP_CACHE(re, &s->gb, 5);
947 level= level * qmul + qadd;
948 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_CACHE(re, &s->gb, 1);
949 SKIP_COUNTER(re, &s->gb, 1+11+5+1);
955 cache= GET_CACHE(re, &s->gb);
960 if (cache&0x80000000) {
961 if (cache&0x40000000) {
963 SKIP_CACHE(re, &s->gb, 2);
964 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
965 run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6);
966 SKIP_COUNTER(re, &s->gb, 2+1+6);
967 UPDATE_CACHE(re, &s->gb);
970 level= SHOW_SBITS(re, &s->gb, 12); LAST_SKIP_BITS(re, &s->gb, 12);
972 if(SHOW_UBITS(re, &s->gb, 1)==0){
973 av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in 3. esc\n");
975 }; SKIP_CACHE(re, &s->gb, 1);
977 level= SHOW_SBITS(re, &s->gb, 12); SKIP_CACHE(re, &s->gb, 12);
979 if(SHOW_UBITS(re, &s->gb, 1)==0){
980 av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in 3. esc\n");
982 }; LAST_SKIP_CACHE(re, &s->gb, 1);
984 SKIP_COUNTER(re, &s->gb, 1+12+1);
988 if(s->error_recognition >= FF_ER_COMPLIANT){
989 const int abs_level= FFABS(level);
990 if(abs_level<=MAX_LEVEL && run<=MAX_RUN){
991 const int run1= run - rl->max_run[last][abs_level] - 1;
992 if(abs_level <= rl->max_level[last][run]){
993 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
996 if(s->error_recognition > FF_ER_COMPLIANT){
997 if(abs_level <= rl->max_level[last][run]*2){
998 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1001 if(run1 >= 0 && abs_level <= rl->max_level[last][run1]){
1002 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1009 if (level>0) level= level * qmul + qadd;
1010 else level= level * qmul - qadd;
1012 if((unsigned)(level + 2048) > 4095){
1013 if(s->error_recognition > FF_ER_COMPLIANT){
1014 if(level > 2560 || level<-2560){
1015 av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc, qp=%d\n", s->qscale);
1019 level= level<0 ? -2048 : 2047;
1026 SKIP_BITS(re, &s->gb, 2);
1027 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1028 i+= run + rl->max_run[run>>7][level/qmul] +1; //FIXME opt indexing
1029 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1030 LAST_SKIP_BITS(re, &s->gb, 1);
1034 SKIP_BITS(re, &s->gb, 1);
1035 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1037 level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
1038 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1039 LAST_SKIP_BITS(re, &s->gb, 1);
1044 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1045 LAST_SKIP_BITS(re, &s->gb, 1);
1050 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1054 block[scan_table[i]] = level;
1058 block[scan_table[i]] = level;
1060 CLOSE_READER(re, &s->gb);
1064 if(!s->use_intra_dc_vlc){
1065 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1067 i -= i>>31; //if(i == -1) i=0;
1070 mpeg4_pred_ac(s, block, n, dc_pred_dir);
1072 i = 63; /* XXX: not optimal */
1075 s->block_last_index[n] = i;
1080 * decode partition C of one MB.
1081 * @return <0 if an error occurred
1083 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, DCTELEM block[6][64])
1086 const int xy= s->mb_x + s->mb_y*s->mb_stride;
1088 mb_type= s->current_picture.mb_type[xy];
1089 cbp = s->cbp_table[xy];
1091 s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
1093 if(s->current_picture.qscale_table[xy] != s->qscale){
1094 ff_set_qscale(s, s->current_picture.qscale_table[xy] );
1097 if (s->pict_type == FF_P_TYPE || s->pict_type==FF_S_TYPE) {
1100 s->mv[0][i][0] = s->current_picture.motion_val[0][ s->block_index[i] ][0];
1101 s->mv[0][i][1] = s->current_picture.motion_val[0][ s->block_index[i] ][1];
1103 s->mb_intra = IS_INTRA(mb_type);
1105 if (IS_SKIP(mb_type)) {
1108 s->block_last_index[i] = -1;
1109 s->mv_dir = MV_DIR_FORWARD;
1110 s->mv_type = MV_TYPE_16X16;
1111 if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){
1118 }else if(s->mb_intra){
1119 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1120 }else if(!s->mb_intra){
1121 // s->mcsel= 0; //FIXME do we need to init that
1123 s->mv_dir = MV_DIR_FORWARD;
1124 if (IS_8X8(mb_type)) {
1125 s->mv_type = MV_TYPE_8X8;
1127 s->mv_type = MV_TYPE_16X16;
1130 } else { /* I-Frame */
1132 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1135 if (!IS_SKIP(mb_type)) {
1137 s->dsp.clear_blocks(s->block[0]);
1138 /* decode each block */
1139 for (i = 0; i < 6; i++) {
1140 if(mpeg4_decode_block(s, block[i], i, cbp&32, s->mb_intra, s->rvlc) < 0){
1141 av_log(s->avctx, AV_LOG_ERROR, "texture corrupted at %d %d %d\n", s->mb_x, s->mb_y, s->mb_intra);
1148 /* per-MB end of slice check */
1150 if(--s->mb_num_left <= 0){
1151 if(mpeg4_is_resync(s))
1156 if(mpeg4_is_resync(s)){
1157 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1158 if(s->cbp_table[xy+delta])
1165 static int mpeg4_decode_mb(MpegEncContext *s,
1166 DCTELEM block[6][64])
1168 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1170 static int8_t quant_tab[4] = { -1, -2, 1, 2 };
1171 const int xy= s->mb_x + s->mb_y * s->mb_stride;
1173 assert(s->h263_pred);
1175 if (s->pict_type == FF_P_TYPE || s->pict_type==FF_S_TYPE) {
1177 if (get_bits1(&s->gb)) {
1181 s->block_last_index[i] = -1;
1182 s->mv_dir = MV_DIR_FORWARD;
1183 s->mv_type = MV_TYPE_16X16;
1184 if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){
1185 s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
1187 s->mv[0][0][0]= get_amv(s, 0);
1188 s->mv[0][0][1]= get_amv(s, 1);
1192 s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
1200 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1202 av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1207 s->dsp.clear_blocks(s->block[0]);
1209 s->mb_intra = ((cbpc & 4) != 0);
1210 if (s->mb_intra) goto intra;
1212 if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
1213 s->mcsel= get_bits1(&s->gb);
1215 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1217 cbp = (cbpc & 3) | (cbpy << 2);
1219 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1221 if((!s->progressive_sequence) && (cbp || (s->workaround_bugs&FF_BUG_XVID_ILACE)))
1222 s->interlaced_dct= get_bits1(&s->gb);
1224 s->mv_dir = MV_DIR_FORWARD;
1225 if ((cbpc & 16) == 0) {
1227 s->current_picture.mb_type[xy]= MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
1228 /* 16x16 global motion prediction */
1229 s->mv_type = MV_TYPE_16X16;
1232 s->mv[0][0][0] = mx;
1233 s->mv[0][0][1] = my;
1234 }else if((!s->progressive_sequence) && get_bits1(&s->gb)){
1235 s->current_picture.mb_type[xy]= MB_TYPE_16x8 | MB_TYPE_L0 | MB_TYPE_INTERLACED;
1236 /* 16x8 field motion prediction */
1237 s->mv_type= MV_TYPE_FIELD;
1239 s->field_select[0][0]= get_bits1(&s->gb);
1240 s->field_select[0][1]= get_bits1(&s->gb);
1242 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1245 mx = h263_decode_motion(s, pred_x, s->f_code);
1249 my = h263_decode_motion(s, pred_y/2, s->f_code);
1253 s->mv[0][i][0] = mx;
1254 s->mv[0][i][1] = my;
1257 s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0;
1258 /* 16x16 motion prediction */
1259 s->mv_type = MV_TYPE_16X16;
1260 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1261 mx = h263_decode_motion(s, pred_x, s->f_code);
1266 my = h263_decode_motion(s, pred_y, s->f_code);
1270 s->mv[0][0][0] = mx;
1271 s->mv[0][0][1] = my;
1274 s->current_picture.mb_type[xy]= MB_TYPE_8x8 | MB_TYPE_L0;
1275 s->mv_type = MV_TYPE_8X8;
1277 mot_val = h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1278 mx = h263_decode_motion(s, pred_x, s->f_code);
1282 my = h263_decode_motion(s, pred_y, s->f_code);
1285 s->mv[0][i][0] = mx;
1286 s->mv[0][i][1] = my;
1291 } else if(s->pict_type==FF_B_TYPE) {
1292 int modb1; // first bit of modb
1293 int modb2; // second bit of modb
1296 s->mb_intra = 0; //B-frames never contain intra blocks
1297 s->mcsel=0; // ... true gmc blocks
1301 s->last_mv[i][0][0]=
1302 s->last_mv[i][0][1]=
1303 s->last_mv[i][1][0]=
1304 s->last_mv[i][1][1]= 0;
1308 /* if we skipped it in the future P Frame than skip it now too */
1309 s->mb_skipped= s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1314 s->block_last_index[i] = -1;
1316 s->mv_dir = MV_DIR_FORWARD;
1317 s->mv_type = MV_TYPE_16X16;
1322 s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
1326 modb1= get_bits1(&s->gb);
1328 mb_type= MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1; //like MB_TYPE_B_DIRECT but no vectors coded
1331 modb2= get_bits1(&s->gb);
1332 mb_type= get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1334 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1337 mb_type= mb_type_b_map[ mb_type ];
1340 s->dsp.clear_blocks(s->block[0]);
1341 cbp= get_bits(&s->gb, 6);
1344 if ((!IS_DIRECT(mb_type)) && cbp) {
1345 if(get_bits1(&s->gb)){
1346 ff_set_qscale(s, s->qscale + get_bits1(&s->gb)*4 - 2);
1350 if(!s->progressive_sequence){
1352 s->interlaced_dct= get_bits1(&s->gb);
1354 if(!IS_DIRECT(mb_type) && get_bits1(&s->gb)){
1355 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1356 mb_type &= ~MB_TYPE_16x16;
1358 if(USES_LIST(mb_type, 0)){
1359 s->field_select[0][0]= get_bits1(&s->gb);
1360 s->field_select[0][1]= get_bits1(&s->gb);
1362 if(USES_LIST(mb_type, 1)){
1363 s->field_select[1][0]= get_bits1(&s->gb);
1364 s->field_select[1][1]= get_bits1(&s->gb);
1370 if((mb_type & (MB_TYPE_DIRECT2|MB_TYPE_INTERLACED)) == 0){
1371 s->mv_type= MV_TYPE_16X16;
1373 if(USES_LIST(mb_type, 0)){
1374 s->mv_dir = MV_DIR_FORWARD;
1376 mx = h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1377 my = h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1378 s->last_mv[0][1][0]= s->last_mv[0][0][0]= s->mv[0][0][0] = mx;
1379 s->last_mv[0][1][1]= s->last_mv[0][0][1]= s->mv[0][0][1] = my;
1382 if(USES_LIST(mb_type, 1)){
1383 s->mv_dir |= MV_DIR_BACKWARD;
1385 mx = h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1386 my = h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1387 s->last_mv[1][1][0]= s->last_mv[1][0][0]= s->mv[1][0][0] = mx;
1388 s->last_mv[1][1][1]= s->last_mv[1][0][1]= s->mv[1][0][1] = my;
1390 }else if(!IS_DIRECT(mb_type)){
1391 s->mv_type= MV_TYPE_FIELD;
1393 if(USES_LIST(mb_type, 0)){
1394 s->mv_dir = MV_DIR_FORWARD;
1397 mx = h263_decode_motion(s, s->last_mv[0][i][0] , s->f_code);
1398 my = h263_decode_motion(s, s->last_mv[0][i][1]/2, s->f_code);
1399 s->last_mv[0][i][0]= s->mv[0][i][0] = mx;
1400 s->last_mv[0][i][1]= (s->mv[0][i][1] = my)*2;
1404 if(USES_LIST(mb_type, 1)){
1405 s->mv_dir |= MV_DIR_BACKWARD;
1408 mx = h263_decode_motion(s, s->last_mv[1][i][0] , s->b_code);
1409 my = h263_decode_motion(s, s->last_mv[1][i][1]/2, s->b_code);
1410 s->last_mv[1][i][0]= s->mv[1][i][0] = mx;
1411 s->last_mv[1][i][1]= (s->mv[1][i][1] = my)*2;
1417 if(IS_DIRECT(mb_type)){
1418 if(IS_SKIP(mb_type))
1421 mx = h263_decode_motion(s, 0, 1);
1422 my = h263_decode_motion(s, 0, 1);
1425 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1426 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1428 s->current_picture.mb_type[xy]= mb_type;
1429 } else { /* I-Frame */
1431 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1433 av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1441 s->ac_pred = get_bits1(&s->gb);
1443 s->current_picture.mb_type[xy]= MB_TYPE_INTRA | MB_TYPE_ACPRED;
1445 s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
1447 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1449 av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1452 cbp = (cbpc & 3) | (cbpy << 2);
1454 s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
1457 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1460 if(!s->progressive_sequence)
1461 s->interlaced_dct= get_bits1(&s->gb);
1463 s->dsp.clear_blocks(s->block[0]);
1464 /* decode each block */
1465 for (i = 0; i < 6; i++) {
1466 if (mpeg4_decode_block(s, block[i], i, cbp&32, 1, 0) < 0)
1473 /* decode each block */
1474 for (i = 0; i < 6; i++) {
1475 if (mpeg4_decode_block(s, block[i], i, cbp&32, 0, 0) < 0)
1481 /* per-MB end of slice check */
1482 if(s->codec_id==CODEC_ID_MPEG4){
1483 if(mpeg4_is_resync(s)){
1484 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1485 if(s->pict_type==FF_B_TYPE && s->next_picture.mbskip_table[xy + delta])
1495 static int mpeg4_decode_gop_header(MpegEncContext * s, GetBitContext *gb){
1496 int hours, minutes, seconds;
1498 if(!show_bits(gb, 23)){
1499 av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1503 hours= get_bits(gb, 5);
1504 minutes= get_bits(gb, 6);
1506 seconds= get_bits(gb, 6);
1508 s->time_base= seconds + 60*(minutes + 60*hours);
1516 static int decode_vol_header(MpegEncContext *s, GetBitContext *gb){
1517 int width, height, vo_ver_id;
1520 skip_bits(gb, 1); /* random access */
1521 s->vo_type= get_bits(gb, 8);
1522 if (get_bits1(gb) != 0) { /* is_ol_id */
1523 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1524 skip_bits(gb, 3); /* vo_priority */
1528 s->aspect_ratio_info= get_bits(gb, 4);
1529 if(s->aspect_ratio_info == FF_ASPECT_EXTENDED){
1530 s->avctx->sample_aspect_ratio.num= get_bits(gb, 8); // par_width
1531 s->avctx->sample_aspect_ratio.den= get_bits(gb, 8); // par_height
1533 s->avctx->sample_aspect_ratio= ff_h263_pixel_aspect[s->aspect_ratio_info];
1536 if ((s->vol_control_parameters=get_bits1(gb))) { /* vol control parameter */
1537 int chroma_format= get_bits(gb, 2);
1538 if(chroma_format!=CHROMA_420){
1539 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1541 s->low_delay= get_bits1(gb);
1542 if(get_bits1(gb)){ /* vbv parameters */
1543 get_bits(gb, 15); /* first_half_bitrate */
1544 skip_bits1(gb); /* marker */
1545 get_bits(gb, 15); /* latter_half_bitrate */
1546 skip_bits1(gb); /* marker */
1547 get_bits(gb, 15); /* first_half_vbv_buffer_size */
1548 skip_bits1(gb); /* marker */
1549 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1550 get_bits(gb, 11); /* first_half_vbv_occupancy */
1551 skip_bits1(gb); /* marker */
1552 get_bits(gb, 15); /* latter_half_vbv_occupancy */
1553 skip_bits1(gb); /* marker */
1556 // set low delay flag only once the smartest? low delay detection won't be overriden
1557 if(s->picture_number==0)
1561 s->shape = get_bits(gb, 2); /* vol shape */
1562 if(s->shape != RECT_SHAPE) av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1563 if(s->shape == GRAY_SHAPE && vo_ver_id != 1){
1564 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1565 skip_bits(gb, 4); //video_object_layer_shape_extension
1568 check_marker(gb, "before time_increment_resolution");
1570 s->avctx->time_base.den = get_bits(gb, 16);
1571 if(!s->avctx->time_base.den){
1572 av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n");
1573 s->avctx->time_base.num = 0;
1577 s->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
1578 if (s->time_increment_bits < 1)
1579 s->time_increment_bits = 1;
1581 check_marker(gb, "before fixed_vop_rate");
1583 if (get_bits1(gb) != 0) { /* fixed_vop_rate */
1584 s->avctx->time_base.num = get_bits(gb, s->time_increment_bits);
1586 s->avctx->time_base.num = 1;
1590 if (s->shape != BIN_ONLY_SHAPE) {
1591 if (s->shape == RECT_SHAPE) {
1592 skip_bits1(gb); /* marker */
1593 width = get_bits(gb, 13);
1594 skip_bits1(gb); /* marker */
1595 height = get_bits(gb, 13);
1596 skip_bits1(gb); /* marker */
1597 if(width && height && !(s->width && s->codec_tag == AV_RL32("MP4S"))){ /* they should be non zero but who knows ... */
1603 s->progressive_sequence=
1604 s->progressive_frame= get_bits1(gb)^1;
1605 s->interlaced_dct=0;
1606 if(!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1607 av_log(s->avctx, AV_LOG_INFO, "MPEG4 OBMC not supported (very likely buggy encoder)\n"); /* OBMC Disable */
1608 if (vo_ver_id == 1) {
1609 s->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1611 s->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1613 if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1614 if(s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE){
1615 if(s->vol_sprite_usage==STATIC_SPRITE){
1616 s->sprite_width = get_bits(gb, 13);
1617 skip_bits1(gb); /* marker */
1618 s->sprite_height= get_bits(gb, 13);
1619 skip_bits1(gb); /* marker */
1620 s->sprite_left = get_bits(gb, 13);
1621 skip_bits1(gb); /* marker */
1622 s->sprite_top = get_bits(gb, 13);
1623 skip_bits1(gb); /* marker */
1625 s->num_sprite_warping_points= get_bits(gb, 6);
1626 if(s->num_sprite_warping_points > 3){
1627 av_log(s->avctx, AV_LOG_ERROR, "%d sprite_warping_points\n", s->num_sprite_warping_points);
1628 s->num_sprite_warping_points= 0;
1631 s->sprite_warping_accuracy = get_bits(gb, 2);
1632 s->sprite_brightness_change= get_bits1(gb);
1633 if(s->vol_sprite_usage==STATIC_SPRITE)
1634 s->low_latency_sprite= get_bits1(gb);
1636 // FIXME sadct disable bit if verid!=1 && shape not rect
1638 if (get_bits1(gb) == 1) { /* not_8_bit */
1639 s->quant_precision = get_bits(gb, 4); /* quant_precision */
1640 if(get_bits(gb, 4)!=8) av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n"); /* bits_per_pixel */
1641 if(s->quant_precision!=5) av_log(s->avctx, AV_LOG_ERROR, "quant precision %d\n", s->quant_precision);
1643 s->quant_precision = 5;
1646 // FIXME a bunch of grayscale shape things
1648 if((s->mpeg_quant=get_bits1(gb))){ /* vol_quant_type */
1651 /* load default matrixes */
1652 for(i=0; i<64; i++){
1653 int j= s->dsp.idct_permutation[i];
1654 v= ff_mpeg4_default_intra_matrix[i];
1655 s->intra_matrix[j]= v;
1656 s->chroma_intra_matrix[j]= v;
1658 v= ff_mpeg4_default_non_intra_matrix[i];
1659 s->inter_matrix[j]= v;
1660 s->chroma_inter_matrix[j]= v;
1663 /* load custom intra matrix */
1666 for(i=0; i<64; i++){
1672 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1673 s->intra_matrix[j]= v;
1674 s->chroma_intra_matrix[j]= v;
1677 /* replicate last value */
1679 int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1680 s->intra_matrix[j]= last;
1681 s->chroma_intra_matrix[j]= last;
1685 /* load custom non intra matrix */
1688 for(i=0; i<64; i++){
1694 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1695 s->inter_matrix[j]= v;
1696 s->chroma_inter_matrix[j]= v;
1699 /* replicate last value */
1701 int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1702 s->inter_matrix[j]= last;
1703 s->chroma_inter_matrix[j]= last;
1707 // FIXME a bunch of grayscale shape things
1711 s->quarter_sample= get_bits1(gb);
1712 else s->quarter_sample=0;
1715 int pos= get_bits_count(gb);
1716 int estimation_method= get_bits(gb, 2);
1717 if(estimation_method<2){
1719 s->cplx_estimation_trash_i += 8*get_bits1(gb); //opaque
1720 s->cplx_estimation_trash_i += 8*get_bits1(gb); //transparent
1721 s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_cae
1722 s->cplx_estimation_trash_i += 8*get_bits1(gb); //inter_cae
1723 s->cplx_estimation_trash_i += 8*get_bits1(gb); //no_update
1724 s->cplx_estimation_trash_i += 8*get_bits1(gb); //upampling
1727 s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_blocks
1728 s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter_blocks
1729 s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter4v_blocks
1730 s->cplx_estimation_trash_i += 8*get_bits1(gb); //not coded blocks
1732 if(!check_marker(gb, "in complexity estimation part 1")){
1733 skip_bits_long(gb, pos - get_bits_count(gb));
1737 s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_coeffs
1738 s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_lines
1739 s->cplx_estimation_trash_i += 8*get_bits1(gb); //vlc_syms
1740 s->cplx_estimation_trash_i += 4*get_bits1(gb); //vlc_bits
1743 s->cplx_estimation_trash_p += 8*get_bits1(gb); //apm
1744 s->cplx_estimation_trash_p += 8*get_bits1(gb); //npm
1745 s->cplx_estimation_trash_b += 8*get_bits1(gb); //interpolate_mc_q
1746 s->cplx_estimation_trash_p += 8*get_bits1(gb); //forwback_mc_q
1747 s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel2
1748 s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel4
1750 if(!check_marker(gb, "in complexity estimation part 2")){
1751 skip_bits_long(gb, pos - get_bits_count(gb));
1754 if(estimation_method==1){
1755 s->cplx_estimation_trash_i += 8*get_bits1(gb); //sadct
1756 s->cplx_estimation_trash_p += 8*get_bits1(gb); //qpel
1759 av_log(s->avctx, AV_LOG_ERROR, "Invalid Complexity estimation method %d\n", estimation_method);
1762 s->cplx_estimation_trash_i=
1763 s->cplx_estimation_trash_p=
1764 s->cplx_estimation_trash_b= 0;
1767 s->resync_marker= !get_bits1(gb); /* resync_marker_disabled */
1769 s->data_partitioning= get_bits1(gb);
1770 if(s->data_partitioning){
1771 s->rvlc= get_bits1(gb);
1774 if(vo_ver_id != 1) {
1775 s->new_pred= get_bits1(gb);
1777 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
1778 skip_bits(gb, 2); /* requested upstream message type */
1779 skip_bits1(gb); /* newpred segment type */
1781 s->reduced_res_vop= get_bits1(gb);
1782 if(s->reduced_res_vop) av_log(s->avctx, AV_LOG_ERROR, "reduced resolution VOP not supported\n");
1786 s->reduced_res_vop= 0;
1789 s->scalability= get_bits1(gb);
1791 if (s->scalability) {
1792 GetBitContext bak= *gb;
1794 int ref_layer_sampling_dir;
1795 int h_sampling_factor_n;
1796 int h_sampling_factor_m;
1797 int v_sampling_factor_n;
1798 int v_sampling_factor_m;
1800 s->hierachy_type= get_bits1(gb);
1801 ref_layer_id= get_bits(gb, 4);
1802 ref_layer_sampling_dir= get_bits1(gb);
1803 h_sampling_factor_n= get_bits(gb, 5);
1804 h_sampling_factor_m= get_bits(gb, 5);
1805 v_sampling_factor_n= get_bits(gb, 5);
1806 v_sampling_factor_m= get_bits(gb, 5);
1807 s->enhancement_type= get_bits1(gb);
1809 if( h_sampling_factor_n==0 || h_sampling_factor_m==0
1810 || v_sampling_factor_n==0 || v_sampling_factor_m==0){
1811 /* illegal scalability header (VERY broken encoder),
1812 * trying to workaround */
1816 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
1818 // bin shape stuff FIXME
1825 * decodes the user data stuff in the header.
1826 * Also initializes divx/xvid/lavc_version/build.
1828 static int decode_user_data(MpegEncContext *s, GetBitContext *gb){
1832 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
1835 for(i=0; i<255 && get_bits_count(gb) < gb->size_in_bits; i++){
1836 if(show_bits(gb, 23) == 0) break;
1837 buf[i]= get_bits(gb, 8);
1841 /* divx detection */
1842 e=sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
1844 e=sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
1846 s->divx_version= ver;
1847 s->divx_build= build;
1848 s->divx_packed= e==3 && last=='p';
1849 if(s->divx_packed && !s->showed_packed_warning) {
1850 av_log(s->avctx, AV_LOG_WARNING, "Invalid and inefficient vfw-avi packed B frames detected\n");
1851 s->showed_packed_warning=1;
1855 /* ffmpeg detection */
1856 e=sscanf(buf, "FFmpe%*[^b]b%d", &build)+3;
1858 e=sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
1860 e=sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3)+1;
1862 build= (ver<<16) + (ver2<<8) + ver3;
1865 if(strcmp(buf, "ffmpeg")==0){
1866 s->lavc_build= 4600;
1870 s->lavc_build= build;
1873 /* Xvid detection */
1874 e=sscanf(buf, "XviD%d", &build);
1876 s->xvid_build= build;
1882 static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
1883 int time_incr, time_increment;
1885 s->pict_type = get_bits(gb, 2) + FF_I_TYPE; /* pict type: I = 0 , P = 1 */
1886 if(s->pict_type==FF_B_TYPE && s->low_delay && s->vol_control_parameters==0 && !(s->flags & CODEC_FLAG_LOW_DELAY)){
1887 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n");
1891 s->partitioned_frame= s->data_partitioning && s->pict_type!=FF_B_TYPE;
1892 if(s->partitioned_frame)
1893 s->decode_mb= mpeg4_decode_partitioned_mb;
1895 s->decode_mb= mpeg4_decode_mb;
1898 while (get_bits1(gb) != 0)
1901 check_marker(gb, "before time_increment");
1903 if(s->time_increment_bits==0 || !(show_bits(gb, s->time_increment_bits+1)&1)){
1904 av_log(s->avctx, AV_LOG_ERROR, "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
1906 for(s->time_increment_bits=1 ;s->time_increment_bits<16; s->time_increment_bits++){
1907 if ( s->pict_type == FF_P_TYPE
1908 || (s->pict_type == FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE)) {
1909 if((show_bits(gb, s->time_increment_bits+6)&0x37) == 0x30) break;
1911 if((show_bits(gb, s->time_increment_bits+5)&0x1F) == 0x18) break;
1914 av_log(s->avctx, AV_LOG_ERROR, "my guess is %d bits ;)\n",s->time_increment_bits);
1917 if(IS_3IV1) time_increment= get_bits1(gb); //FIXME investigate further
1918 else time_increment= get_bits(gb, s->time_increment_bits);
1920 if(s->pict_type!=FF_B_TYPE){
1921 s->last_time_base= s->time_base;
1922 s->time_base+= time_incr;
1923 s->time= s->time_base*s->avctx->time_base.den + time_increment;
1924 if(s->workaround_bugs&FF_BUG_UMP4){
1925 if(s->time < s->last_non_b_time){
1926 /* header is not mpeg-4-compatible, broken encoder,
1927 * trying to workaround */
1929 s->time+= s->avctx->time_base.den;
1932 s->pp_time= s->time - s->last_non_b_time;
1933 s->last_non_b_time= s->time;
1935 s->time= (s->last_time_base + time_incr)*s->avctx->time_base.den + time_increment;
1936 s->pb_time= s->pp_time - (s->last_non_b_time - s->time);
1937 if(s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0){
1938 /* messed up order, maybe after seeking? skipping current b-frame */
1939 return FRAME_SKIPPED;
1941 ff_mpeg4_init_direct_mv(s);
1943 if(s->t_frame==0) s->t_frame= s->pb_time;
1944 if(s->t_frame==0) s->t_frame=1; // 1/0 protection
1945 s->pp_field_time= ( ROUNDED_DIV(s->last_non_b_time, s->t_frame)
1946 - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
1947 s->pb_field_time= ( ROUNDED_DIV(s->time, s->t_frame)
1948 - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
1949 if(!s->progressive_sequence){
1950 if(s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1)
1951 return FRAME_SKIPPED;
1955 if(s->avctx->time_base.num)
1956 s->current_picture_ptr->pts= (s->time + s->avctx->time_base.num/2) / s->avctx->time_base.num;
1958 s->current_picture_ptr->pts= AV_NOPTS_VALUE;
1959 if(s->avctx->debug&FF_DEBUG_PTS)
1960 av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n", s->current_picture_ptr->pts);
1962 check_marker(gb, "before vop_coded");
1965 if (get_bits1(gb) != 1){
1966 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
1967 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
1968 return FRAME_SKIPPED;
1970 if (s->shape != BIN_ONLY_SHAPE && ( s->pict_type == FF_P_TYPE
1971 || (s->pict_type == FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE))) {
1972 /* rounding type for motion estimation */
1973 s->no_rounding = get_bits1(gb);
1977 //FIXME reduced res stuff
1979 if (s->shape != RECT_SHAPE) {
1980 if (s->vol_sprite_usage != 1 || s->pict_type != FF_I_TYPE) {
1981 int width, height, hor_spat_ref, ver_spat_ref;
1983 width = get_bits(gb, 13);
1984 skip_bits1(gb); /* marker */
1985 height = get_bits(gb, 13);
1986 skip_bits1(gb); /* marker */
1987 hor_spat_ref = get_bits(gb, 13); /* hor_spat_ref */
1988 skip_bits1(gb); /* marker */
1989 ver_spat_ref = get_bits(gb, 13); /* ver_spat_ref */
1991 skip_bits1(gb); /* change_CR_disable */
1993 if (get_bits1(gb) != 0) {
1994 skip_bits(gb, 8); /* constant_alpha_value */
1997 //FIXME complexity estimation stuff
1999 if (s->shape != BIN_ONLY_SHAPE) {
2000 skip_bits_long(gb, s->cplx_estimation_trash_i);
2001 if(s->pict_type != FF_I_TYPE)
2002 skip_bits_long(gb, s->cplx_estimation_trash_p);
2003 if(s->pict_type == FF_B_TYPE)
2004 skip_bits_long(gb, s->cplx_estimation_trash_b);
2006 s->intra_dc_threshold= mpeg4_dc_threshold[ get_bits(gb, 3) ];
2007 if(!s->progressive_sequence){
2008 s->top_field_first= get_bits1(gb);
2009 s->alternate_scan= get_bits1(gb);
2011 s->alternate_scan= 0;
2014 if(s->alternate_scan){
2015 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
2016 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
2017 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2018 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2020 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
2021 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
2022 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2023 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2026 if(s->pict_type == FF_S_TYPE && (s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE)){
2027 mpeg4_decode_sprite_trajectory(s, gb);
2028 if(s->sprite_brightness_change) av_log(s->avctx, AV_LOG_ERROR, "sprite_brightness_change not supported\n");
2029 if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2032 if (s->shape != BIN_ONLY_SHAPE) {
2033 s->chroma_qscale= s->qscale = get_bits(gb, s->quant_precision);
2035 av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (qscale=0)\n");
2036 return -1; // makes no sense to continue, as there is nothing left from the image then
2039 if (s->pict_type != FF_I_TYPE) {
2040 s->f_code = get_bits(gb, 3); /* fcode_for */
2042 av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (f_code=0)\n");
2043 return -1; // makes no sense to continue, as the MV decoding will break very quickly
2048 if (s->pict_type == FF_B_TYPE) {
2049 s->b_code = get_bits(gb, 3);
2053 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2054 av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%d,%d %s size:%d pro:%d alt:%d top:%d %spel part:%d resync:%d w:%d a:%d rnd:%d vot:%d%s dc:%d ce:%d/%d/%d\n",
2055 s->qscale, s->f_code, s->b_code,
2056 s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
2057 gb->size_in_bits,s->progressive_sequence, s->alternate_scan, s->top_field_first,
2058 s->quarter_sample ? "q" : "h", s->data_partitioning, s->resync_marker, s->num_sprite_warping_points,
2059 s->sprite_warping_accuracy, 1-s->no_rounding, s->vo_type, s->vol_control_parameters ? " VOLC" : " ", s->intra_dc_threshold, s->cplx_estimation_trash_i, s->cplx_estimation_trash_p, s->cplx_estimation_trash_b);
2062 if(!s->scalability){
2063 if (s->shape!=RECT_SHAPE && s->pict_type!=FF_I_TYPE) {
2064 skip_bits1(gb); // vop shape coding type
2067 if(s->enhancement_type){
2068 int load_backward_shape= get_bits1(gb);
2069 if(load_backward_shape){
2070 av_log(s->avctx, AV_LOG_ERROR, "load backward shape isn't supported\n");
2073 skip_bits(gb, 2); //ref_select_code
2076 /* detect buggy encoders which don't set the low_delay flag (divx4/xvid/opendivx)*/
2077 // note we cannot detect divx5 without b-frames easily (although it's buggy too)
2078 if(s->vo_type==0 && s->vol_control_parameters==0 && s->divx_version==-1 && s->picture_number==0){
2079 av_log(s->avctx, AV_LOG_WARNING, "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2083 s->picture_number++; // better than pic number==0 always ;)
2085 s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table; //FIXME add short header support
2086 s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
2088 if(s->workaround_bugs&FF_BUG_EDGE){
2089 s->h_edge_pos= s->width;
2090 s->v_edge_pos= s->height;
2096 * decode mpeg4 headers
2097 * @return <0 if no VOP found (or a damaged one)
2098 * FRAME_SKIPPED if a not coded VOP is found
2099 * 0 if a VOP is found
2101 int ff_mpeg4_decode_picture_header(MpegEncContext * s, GetBitContext *gb)
2105 /* search next start code */
2108 if(s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630){
2110 if(get_bits(gb, 8) == 0xF0)
2116 if(get_bits_count(gb) >= gb->size_in_bits){
2117 if(gb->size_in_bits==8 && (s->divx_version>=0 || s->xvid_build>=0)){
2118 av_log(s->avctx, AV_LOG_WARNING, "frame skip %d\n", gb->size_in_bits);
2119 return FRAME_SKIPPED; //divx bug
2121 return -1; //end of stream
2124 /* use the bits after the test */
2125 v = get_bits(gb, 8);
2126 startcode = ((startcode << 8) | v) & 0xffffffff;
2128 if((startcode&0xFFFFFF00) != 0x100)
2129 continue; //no startcode
2131 if(s->avctx->debug&FF_DEBUG_STARTCODE){
2132 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2133 if (startcode<=0x11F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2134 else if(startcode<=0x12F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2135 else if(startcode<=0x13F) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2136 else if(startcode<=0x15F) av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2137 else if(startcode<=0x1AF) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2138 else if(startcode==0x1B0) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2139 else if(startcode==0x1B1) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2140 else if(startcode==0x1B2) av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2141 else if(startcode==0x1B3) av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2142 else if(startcode==0x1B4) av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2143 else if(startcode==0x1B5) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2144 else if(startcode==0x1B6) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2145 else if(startcode==0x1B7) av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2146 else if(startcode==0x1B8) av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2147 else if(startcode==0x1B9) av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2148 else if(startcode==0x1BA) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2149 else if(startcode==0x1BB) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2150 else if(startcode==0x1BC) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2151 else if(startcode==0x1BD) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2152 else if(startcode==0x1BE) av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2153 else if(startcode==0x1BF) av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2154 else if(startcode==0x1C0) av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2155 else if(startcode==0x1C1) av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2156 else if(startcode==0x1C2) av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2157 else if(startcode==0x1C3) av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2158 else if(startcode<=0x1C5) av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2159 else if(startcode<=0x1FF) av_log(s->avctx, AV_LOG_DEBUG, "System start");
2160 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2163 if(startcode >= 0x120 && startcode <= 0x12F){
2164 if(decode_vol_header(s, gb) < 0)
2167 else if(startcode == USER_DATA_STARTCODE){
2168 decode_user_data(s, gb);
2170 else if(startcode == GOP_STARTCODE){
2171 mpeg4_decode_gop_header(s, gb);
2173 else if(startcode == VOP_STARTCODE){
2181 if(s->flags& CODEC_FLAG_LOW_DELAY)
2183 s->avctx->has_b_frames= !s->low_delay;
2184 return decode_vop_header(s, gb);
2187 static av_cold int decode_init(AVCodecContext *avctx)
2189 MpegEncContext *s = avctx->priv_data;
2191 static int done = 0;
2198 if((ret=ff_h263_decode_init(avctx)) < 0)
2204 init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
2205 init_rl(&rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
2206 init_rl(&rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
2207 INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
2208 INIT_VLC_RL(rvlc_rl_inter, 1072);
2209 INIT_VLC_RL(rvlc_rl_intra, 1072);
2210 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2211 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2212 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2213 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2214 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2215 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2216 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2217 &sprite_trajectory_tab[0][1], 4, 2,
2218 &sprite_trajectory_tab[0][0], 4, 2, 128);
2219 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2220 &mb_type_b_tab[0][1], 2, 1,
2221 &mb_type_b_tab[0][0], 2, 1, 16);
2225 s->low_delay = 0; //default, might be overriden in the vol header during header parsing
2226 s->decode_mb= mpeg4_decode_mb;
2227 s->time_increment_bits = 4; /* default value for broken headers */
2228 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
2233 AVCodec ff_mpeg4_decoder = {
2237 sizeof(MpegEncContext),
2241 ff_h263_decode_frame,
2242 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2243 .flush= ff_mpeg_flush,
2245 .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2246 .pix_fmts= ff_hwaccel_pixfmt_list_420,
2250 #if CONFIG_MPEG4_VDPAU_DECODER
2251 AVCodec ff_mpeg4_vdpau_decoder = {
2255 sizeof(MpegEncContext),
2259 ff_h263_decode_frame,
2260 CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_HWACCEL_VDPAU,
2261 .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2262 .pix_fmts= (const enum PixelFormat[]){PIX_FMT_VDPAU_MPEG4, PIX_FMT_NONE},