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"
28 // The defines below define the number of bits that are read at once for
29 // reading vlc values. Changing these may improve speed and data cache needs
30 // be aware though that decreasing them may need the number of stages that is
31 // passed to get_vlc* to be increased.
32 #define SPRITE_TRAJ_VLC_BITS 6
34 #define MB_TYPE_B_VLC_BITS 4
37 static VLC dc_lum, dc_chrom;
38 static VLC sprite_trajectory;
39 static VLC mb_type_b_vlc;
41 static const int mb_type_b_map[4]= {
42 MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
43 MB_TYPE_L0L1 | MB_TYPE_16x16,
44 MB_TYPE_L1 | MB_TYPE_16x16,
45 MB_TYPE_L0 | MB_TYPE_16x16,
50 * @param n block index (0-3 are luma, 4-5 are chroma)
51 * @param dir the ac prediction direction
53 void mpeg4_pred_ac(MpegEncContext * s, DCTELEM *block, int n,
57 int16_t *ac_val, *ac_val1;
58 int8_t * const qscale_table= s->current_picture.qscale_table;
61 ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
65 const int xy= s->mb_x-1 + s->mb_y*s->mb_stride;
69 if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){
72 block[s->dsp.idct_permutation[i<<3]] += ac_val[i];
75 /* different qscale, we must rescale */
77 block[s->dsp.idct_permutation[i<<3]] += ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale);
81 const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride;
83 ac_val -= 16 * s->block_wrap[n];
85 if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
88 block[s->dsp.idct_permutation[i]] += ac_val[i + 8];
91 /* different qscale, we must rescale */
93 block[s->dsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale);
100 ac_val1[i ] = block[s->dsp.idct_permutation[i<<3]];
104 ac_val1[8 + i] = block[s->dsp.idct_permutation[i ]];
109 * check if the next stuff is a resync marker or the end.
112 static inline int mpeg4_is_resync(MpegEncContext *s){
113 int bits_count= get_bits_count(&s->gb);
114 int v= show_bits(&s->gb, 16);
116 if(s->workaround_bugs&FF_BUG_NO_PADDING){
121 if(s->pict_type==AV_PICTURE_TYPE_B || (v>>(8-s->pict_type)!=1) || s->partitioned_frame)
123 skip_bits(&s->gb, 8+s->pict_type);
124 bits_count+= 8+s->pict_type;
125 v= show_bits(&s->gb, 16);
128 if(bits_count + 8 >= s->gb.size_in_bits){
130 v|= 0x7F >> (7-(bits_count&7));
135 if(v == ff_mpeg4_resync_prefix[bits_count&7]){
137 GetBitContext gb= s->gb;
139 skip_bits(&s->gb, 1);
140 align_get_bits(&s->gb);
142 for(len=0; len<32; len++){
143 if(get_bits1(&s->gb)) break;
148 if(len>=ff_mpeg4_get_video_packet_prefix_length(s))
155 static void mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb)
158 int a= 2<<s->sprite_warping_accuracy;
159 int rho= 3-s->sprite_warping_accuracy;
161 const int vop_ref[4][2]= {{0,0}, {s->width,0}, {0, s->height}, {s->width, s->height}}; // only true for rectangle shapes
162 int d[4][2]={{0,0}, {0,0}, {0,0}, {0,0}};
163 int sprite_ref[4][2];
164 int virtual_ref[2][2];
171 for(i=0; i<s->num_sprite_warping_points; i++){
175 length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
177 x= get_xbits(gb, length);
179 if(!(s->divx_version==500 && s->divx_build==413)) skip_bits1(gb); /* marker bit */
181 length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
183 y=get_xbits(gb, length);
185 skip_bits1(gb); /* marker bit */
186 s->sprite_traj[i][0]= d[i][0]= x;
187 s->sprite_traj[i][1]= d[i][1]= y;
190 s->sprite_traj[i][0]= s->sprite_traj[i][1]= 0;
192 while((1<<alpha)<w) alpha++;
193 while((1<<beta )<h) beta++; // there seems to be a typo in the mpeg4 std for the definition of w' and h'
197 // Note, the 4th point isn't used for GMC
198 if(s->divx_version==500 && s->divx_build==413){
199 sprite_ref[0][0]= a*vop_ref[0][0] + d[0][0];
200 sprite_ref[0][1]= a*vop_ref[0][1] + d[0][1];
201 sprite_ref[1][0]= a*vop_ref[1][0] + d[0][0] + d[1][0];
202 sprite_ref[1][1]= a*vop_ref[1][1] + d[0][1] + d[1][1];
203 sprite_ref[2][0]= a*vop_ref[2][0] + d[0][0] + d[2][0];
204 sprite_ref[2][1]= a*vop_ref[2][1] + d[0][1] + d[2][1];
206 sprite_ref[0][0]= (a>>1)*(2*vop_ref[0][0] + d[0][0]);
207 sprite_ref[0][1]= (a>>1)*(2*vop_ref[0][1] + d[0][1]);
208 sprite_ref[1][0]= (a>>1)*(2*vop_ref[1][0] + d[0][0] + d[1][0]);
209 sprite_ref[1][1]= (a>>1)*(2*vop_ref[1][1] + d[0][1] + d[1][1]);
210 sprite_ref[2][0]= (a>>1)*(2*vop_ref[2][0] + d[0][0] + d[2][0]);
211 sprite_ref[2][1]= (a>>1)*(2*vop_ref[2][1] + d[0][1] + d[2][1]);
213 /* sprite_ref[3][0]= (a>>1)*(2*vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
214 sprite_ref[3][1]= (a>>1)*(2*vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
216 // this is mostly identical to the mpeg4 std (and is totally unreadable because of that ...)
217 // perhaps it should be reordered to be more readable ...
218 // the idea behind this virtual_ref mess is to be able to use shifts later per pixel instead of divides
219 // so the distance between points is converted from w&h based to w2&h2 based which are of the 2^x form
220 virtual_ref[0][0]= 16*(vop_ref[0][0] + w2)
221 + 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);
222 virtual_ref[0][1]= 16*vop_ref[0][1]
223 + 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);
224 virtual_ref[1][0]= 16*vop_ref[0][0]
225 + 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);
226 virtual_ref[1][1]= 16*(vop_ref[0][1] + h2)
227 + 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);
229 switch(s->num_sprite_warping_points)
232 s->sprite_offset[0][0]= 0;
233 s->sprite_offset[0][1]= 0;
234 s->sprite_offset[1][0]= 0;
235 s->sprite_offset[1][1]= 0;
236 s->sprite_delta[0][0]= a;
237 s->sprite_delta[0][1]= 0;
238 s->sprite_delta[1][0]= 0;
239 s->sprite_delta[1][1]= a;
240 s->sprite_shift[0]= 0;
241 s->sprite_shift[1]= 0;
244 s->sprite_offset[0][0]= sprite_ref[0][0] - a*vop_ref[0][0];
245 s->sprite_offset[0][1]= sprite_ref[0][1] - a*vop_ref[0][1];
246 s->sprite_offset[1][0]= ((sprite_ref[0][0]>>1)|(sprite_ref[0][0]&1)) - a*(vop_ref[0][0]/2);
247 s->sprite_offset[1][1]= ((sprite_ref[0][1]>>1)|(sprite_ref[0][1]&1)) - a*(vop_ref[0][1]/2);
248 s->sprite_delta[0][0]= a;
249 s->sprite_delta[0][1]= 0;
250 s->sprite_delta[1][0]= 0;
251 s->sprite_delta[1][1]= a;
252 s->sprite_shift[0]= 0;
253 s->sprite_shift[1]= 0;
256 s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+rho))
257 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][0])
258 + ( r*sprite_ref[0][1] - virtual_ref[0][1])*(-vop_ref[0][1])
259 + (1<<(alpha+rho-1));
260 s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+rho))
261 + (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-vop_ref[0][0])
262 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][1])
263 + (1<<(alpha+rho-1));
264 s->sprite_offset[1][0]= ( (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][0] + 1)
265 +( r*sprite_ref[0][1] - virtual_ref[0][1])*(-2*vop_ref[0][1] + 1)
266 +2*w2*r*sprite_ref[0][0]
268 + (1<<(alpha+rho+1)));
269 s->sprite_offset[1][1]= ( (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-2*vop_ref[0][0] + 1)
270 +(-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][1] + 1)
271 +2*w2*r*sprite_ref[0][1]
273 + (1<<(alpha+rho+1)));
274 s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
275 s->sprite_delta[0][1]= (+r*sprite_ref[0][1] - virtual_ref[0][1]);
276 s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1]);
277 s->sprite_delta[1][1]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
279 s->sprite_shift[0]= alpha+rho;
280 s->sprite_shift[1]= alpha+rho+2;
283 min_ab= FFMIN(alpha, beta);
286 s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+beta+rho-min_ab))
287 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-vop_ref[0][0])
288 + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-vop_ref[0][1])
289 + (1<<(alpha+beta+rho-min_ab-1));
290 s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+beta+rho-min_ab))
291 + (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-vop_ref[0][0])
292 + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-vop_ref[0][1])
293 + (1<<(alpha+beta+rho-min_ab-1));
294 s->sprite_offset[1][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-2*vop_ref[0][0] + 1)
295 + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-2*vop_ref[0][1] + 1)
296 + 2*w2*h3*r*sprite_ref[0][0]
298 + (1<<(alpha+beta+rho-min_ab+1));
299 s->sprite_offset[1][1]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-2*vop_ref[0][0] + 1)
300 + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-2*vop_ref[0][1] + 1)
301 + 2*w2*h3*r*sprite_ref[0][1]
303 + (1<<(alpha+beta+rho-min_ab+1));
304 s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3;
305 s->sprite_delta[0][1]= (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3;
306 s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3;
307 s->sprite_delta[1][1]= (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3;
309 s->sprite_shift[0]= alpha + beta + rho - min_ab;
310 s->sprite_shift[1]= alpha + beta + rho - min_ab + 2;
313 /* try to simplify the situation */
314 if( s->sprite_delta[0][0] == a<<s->sprite_shift[0]
315 && s->sprite_delta[0][1] == 0
316 && s->sprite_delta[1][0] == 0
317 && s->sprite_delta[1][1] == a<<s->sprite_shift[0])
319 s->sprite_offset[0][0]>>=s->sprite_shift[0];
320 s->sprite_offset[0][1]>>=s->sprite_shift[0];
321 s->sprite_offset[1][0]>>=s->sprite_shift[1];
322 s->sprite_offset[1][1]>>=s->sprite_shift[1];
323 s->sprite_delta[0][0]= a;
324 s->sprite_delta[0][1]= 0;
325 s->sprite_delta[1][0]= 0;
326 s->sprite_delta[1][1]= a;
327 s->sprite_shift[0]= 0;
328 s->sprite_shift[1]= 0;
329 s->real_sprite_warping_points=1;
332 int shift_y= 16 - s->sprite_shift[0];
333 int shift_c= 16 - s->sprite_shift[1];
335 s->sprite_offset[0][i]<<= shift_y;
336 s->sprite_offset[1][i]<<= shift_c;
337 s->sprite_delta[0][i]<<= shift_y;
338 s->sprite_delta[1][i]<<= shift_y;
339 s->sprite_shift[i]= 16;
341 s->real_sprite_warping_points= s->num_sprite_warping_points;
346 * decodes the next video packet.
347 * @return <0 if something went wrong
349 int mpeg4_decode_video_packet_header(MpegEncContext *s)
351 int mb_num_bits= av_log2(s->mb_num - 1) + 1;
352 int header_extension=0, mb_num, len;
354 /* is there enough space left for a video packet + header */
355 if( get_bits_count(&s->gb) > s->gb.size_in_bits-20) return -1;
357 for(len=0; len<32; len++){
358 if(get_bits1(&s->gb)) break;
361 if(len!=ff_mpeg4_get_video_packet_prefix_length(s)){
362 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
366 if(s->shape != RECT_SHAPE){
367 header_extension= get_bits1(&s->gb);
368 //FIXME more stuff here
371 mb_num= get_bits(&s->gb, mb_num_bits);
372 if(mb_num>=s->mb_num){
373 av_log(s->avctx, AV_LOG_ERROR, "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
376 if(s->pict_type == AV_PICTURE_TYPE_B){
377 int mb_x = 0, mb_y = 0;
379 while(s->next_picture.mbskip_table[ s->mb_index2xy[ mb_num ] ]) {
380 if (!mb_x) ff_thread_await_progress((AVFrame*)s->next_picture_ptr, mb_y++, 0);
382 if (++mb_x == s->mb_width) mb_x = 0;
384 if(mb_num >= s->mb_num) return -1; // slice contains just skipped MBs which where already decoded
387 s->mb_x= mb_num % s->mb_width;
388 s->mb_y= mb_num / s->mb_width;
390 if(s->shape != BIN_ONLY_SHAPE){
391 int qscale= get_bits(&s->gb, s->quant_precision);
393 s->chroma_qscale=s->qscale= qscale;
396 if(s->shape == RECT_SHAPE){
397 header_extension= get_bits1(&s->gb);
399 if(header_extension){
403 while (get_bits1(&s->gb) != 0)
406 check_marker(&s->gb, "before time_increment in video packed header");
407 time_increment= get_bits(&s->gb, s->time_increment_bits);
408 check_marker(&s->gb, "before vop_coding_type in video packed header");
410 skip_bits(&s->gb, 2); /* vop coding type */
411 //FIXME not rect stuff here
413 if(s->shape != BIN_ONLY_SHAPE){
414 skip_bits(&s->gb, 3); /* intra dc vlc threshold */
415 //FIXME don't just ignore everything
416 if(s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
417 mpeg4_decode_sprite_trajectory(s, &s->gb);
418 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
421 //FIXME reduced res stuff here
423 if (s->pict_type != AV_PICTURE_TYPE_I) {
424 int f_code = get_bits(&s->gb, 3); /* fcode_for */
426 av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (f_code=0)\n");
429 if (s->pict_type == AV_PICTURE_TYPE_B) {
430 int b_code = get_bits(&s->gb, 3);
432 av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (b_code=0)\n");
437 //FIXME new-pred stuff
443 * gets the average motion vector for a GMC MB.
444 * @param n either 0 for the x component or 1 for y
445 * @return the average MV for a GMC MB
447 static inline int get_amv(MpegEncContext *s, int n){
448 int x, y, mb_v, sum, dx, dy, shift;
449 int len = 1 << (s->f_code + 4);
450 const int a= s->sprite_warping_accuracy;
452 if(s->workaround_bugs & FF_BUG_AMV)
453 len >>= s->quarter_sample;
455 if(s->real_sprite_warping_points==1){
456 if(s->divx_version==500 && s->divx_build==413)
457 sum= s->sprite_offset[0][n] / (1<<(a - s->quarter_sample));
459 sum= RSHIFT(s->sprite_offset[0][n]<<s->quarter_sample, a);
461 dx= s->sprite_delta[n][0];
462 dy= s->sprite_delta[n][1];
463 shift= s->sprite_shift[0];
464 if(n) dy -= 1<<(shift + a + 1);
465 else dx -= 1<<(shift + a + 1);
466 mb_v= s->sprite_offset[0][n] + dx*s->mb_x*16 + dy*s->mb_y*16;
479 sum= RSHIFT(sum, a+8-s->quarter_sample);
482 if (sum < -len) sum= -len;
483 else if (sum >= len) sum= len-1;
489 * decodes the dc value.
490 * @param n block index (0-3 are luma, 4-5 are chroma)
491 * @param dir_ptr the prediction direction will be stored here
492 * @return the quantized dc
494 static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
499 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
501 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
502 if (code < 0 || code > 9 /* && s->nbit<9 */){
503 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
511 level= 2*get_bits1(&s->gb)-1;
513 if(get_bits1(&s->gb))
514 level = get_bits(&s->gb, code-1) + (1<<(code-1));
516 level = -get_bits(&s->gb, code-1) - (1<<(code-1));
519 level = get_xbits(&s->gb, code);
523 if(get_bits1(&s->gb)==0){ /* marker */
524 if(s->error_recognition>=2){
525 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
532 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
536 * decodes first partition.
537 * @return number of MBs decoded or <0 if an error occurred
539 static int mpeg4_decode_partition_a(MpegEncContext *s){
541 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
543 /* decode first partition */
545 s->first_slice_line=1;
546 for(; s->mb_y<s->mb_height; s->mb_y++){
547 ff_init_block_index(s);
548 for(; s->mb_x<s->mb_width; s->mb_x++){
549 const int xy= s->mb_x + s->mb_y*s->mb_stride;
554 ff_update_block_index(s);
555 if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
556 s->first_slice_line=0;
558 if(s->pict_type==AV_PICTURE_TYPE_I){
562 if(show_bits_long(&s->gb, 19)==DC_MARKER){
566 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
568 av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
573 s->cbp_table[xy]= cbpc & 3;
574 s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
578 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
580 s->current_picture.qscale_table[xy]= s->qscale;
582 s->mbintra_table[xy]= 1;
585 int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
587 av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
591 if(dc_pred_dir) dir|=1;
593 s->pred_dir_table[xy]= dir;
594 }else{ /* P/S_TYPE */
595 int mx, my, pred_x, pred_y, bits;
596 int16_t * const mot_val= s->current_picture.motion_val[0][s->block_index[0]];
597 const int stride= s->b8_stride*2;
600 bits= show_bits(&s->gb, 17);
601 if(bits==MOTION_MARKER){
607 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
608 s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
612 s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
615 mot_val[0 ]= mot_val[2 ]=
616 mot_val[0+stride]= mot_val[2+stride]= mx;
617 mot_val[1 ]= mot_val[3 ]=
618 mot_val[1+stride]= mot_val[3+stride]= my;
620 if(s->mbintra_table[xy])
621 ff_clean_intra_table_entries(s);
625 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
627 av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
633 s->cbp_table[xy]= cbpc&(8+3); //8 is dquant
635 s->mb_intra = ((cbpc & 4) != 0);
638 s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
639 s->mbintra_table[xy]= 1;
640 mot_val[0 ]= mot_val[2 ]=
641 mot_val[0+stride]= mot_val[2+stride]= 0;
642 mot_val[1 ]= mot_val[3 ]=
643 mot_val[1+stride]= mot_val[3+stride]= 0;
645 if(s->mbintra_table[xy])
646 ff_clean_intra_table_entries(s);
648 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
649 s->mcsel= get_bits1(&s->gb);
652 if ((cbpc & 16) == 0) {
653 /* 16x16 motion prediction */
655 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
657 mx = h263_decode_motion(s, pred_x, s->f_code);
661 my = h263_decode_motion(s, pred_y, s->f_code);
664 s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0;
668 s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
671 mot_val[0 ]= mot_val[2 ] =
672 mot_val[0+stride]= mot_val[2+stride]= mx;
673 mot_val[1 ]= mot_val[3 ]=
674 mot_val[1+stride]= mot_val[3+stride]= my;
677 s->current_picture.mb_type[xy]= MB_TYPE_8x8 | MB_TYPE_L0;
679 int16_t *mot_val= h263_pred_motion(s, i, 0, &pred_x, &pred_y);
680 mx = h263_decode_motion(s, pred_x, s->f_code);
684 my = h263_decode_motion(s, pred_y, s->f_code);
701 * decode second partition.
702 * @return <0 if an error occurred
704 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count){
706 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
708 s->mb_x= s->resync_mb_x;
709 s->first_slice_line=1;
710 for(s->mb_y= s->resync_mb_y; mb_num < mb_count; s->mb_y++){
711 ff_init_block_index(s);
712 for(; mb_num < mb_count && s->mb_x<s->mb_width; s->mb_x++){
713 const int xy= s->mb_x + s->mb_y*s->mb_stride;
716 ff_update_block_index(s);
717 if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
718 s->first_slice_line=0;
720 if(s->pict_type==AV_PICTURE_TYPE_I){
721 int ac_pred= get_bits1(&s->gb);
722 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
724 av_log(s->avctx, AV_LOG_ERROR, "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
728 s->cbp_table[xy]|= cbpy<<2;
729 s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
730 }else{ /* P || S_TYPE */
731 if(IS_INTRA(s->current_picture.mb_type[xy])){
733 int ac_pred = get_bits1(&s->gb);
734 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
737 av_log(s->avctx, AV_LOG_ERROR, "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
741 if(s->cbp_table[xy] & 8) {
742 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
744 s->current_picture.qscale_table[xy]= s->qscale;
748 int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
750 av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
754 if(dc_pred_dir) dir|=1;
756 s->cbp_table[xy]&= 3; //remove dquant
757 s->cbp_table[xy]|= cbpy<<2;
758 s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
759 s->pred_dir_table[xy]= dir;
760 }else if(IS_SKIP(s->current_picture.mb_type[xy])){
761 s->current_picture.qscale_table[xy]= s->qscale;
764 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
767 av_log(s->avctx, AV_LOG_ERROR, "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
771 if(s->cbp_table[xy] & 8) {
772 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
774 s->current_picture.qscale_table[xy]= s->qscale;
776 s->cbp_table[xy]&= 3; //remove dquant
777 s->cbp_table[xy]|= (cbpy^0xf)<<2;
781 if(mb_num >= mb_count) return 0;
788 * decodes the first & second partition
789 * @return <0 if error (and sets error type in the error_status_table)
791 int ff_mpeg4_decode_partitions(MpegEncContext *s)
794 const int part_a_error= s->pict_type==AV_PICTURE_TYPE_I ? (DC_ERROR|MV_ERROR) : MV_ERROR;
795 const int part_a_end = s->pict_type==AV_PICTURE_TYPE_I ? (DC_END |MV_END) : MV_END;
797 mb_num= mpeg4_decode_partition_a(s);
799 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
803 if(s->resync_mb_x + s->resync_mb_y*s->mb_width + mb_num > s->mb_num){
804 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
805 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
809 s->mb_num_left= mb_num;
811 if(s->pict_type==AV_PICTURE_TYPE_I){
812 while(show_bits(&s->gb, 9) == 1)
813 skip_bits(&s->gb, 9);
814 if(get_bits_long(&s->gb, 19)!=DC_MARKER){
815 av_log(s->avctx, AV_LOG_ERROR, "marker missing after first I partition at %d %d\n", s->mb_x, s->mb_y);
819 while(show_bits(&s->gb, 10) == 1)
820 skip_bits(&s->gb, 10);
821 if(get_bits(&s->gb, 17)!=MOTION_MARKER){
822 av_log(s->avctx, AV_LOG_ERROR, "marker missing after first P partition at %d %d\n", s->mb_x, s->mb_y);
826 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, part_a_end);
828 if( mpeg4_decode_partition_b(s, mb_num) < 0){
829 if(s->pict_type==AV_PICTURE_TYPE_P)
830 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, DC_ERROR);
833 if(s->pict_type==AV_PICTURE_TYPE_P)
834 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, DC_END);
842 * @return <0 if an error occurred
844 static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
845 int n, int coded, int intra, int rvlc)
847 int level, i, last, run;
850 RL_VLC_ELEM * rl_vlc;
851 const uint8_t * scan_table;
854 //Note intra & rvlc should be optimized away if this is inlined
857 if(s->use_intra_dc_vlc){
859 if(s->partitioned_frame){
860 level = s->dc_val[0][ s->block_index[n] ];
861 if(n<4) level= FASTDIV((level + (s->y_dc_scale>>1)), s->y_dc_scale);
862 else level= FASTDIV((level + (s->c_dc_scale>>1)), s->c_dc_scale);
863 dc_pred_dir= (s->pred_dir_table[s->mb_x + s->mb_y*s->mb_stride]<<n)&32;
865 level = mpeg4_decode_dc(s, n, &dc_pred_dir);
873 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
880 rl_vlc = rvlc_rl_intra.rl_vlc[0];
882 rl = &ff_mpeg4_rl_intra;
883 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
886 if (dc_pred_dir == 0)
887 scan_table = s->intra_v_scantable.permutated; /* left */
889 scan_table = s->intra_h_scantable.permutated; /* top */
891 scan_table = s->intra_scantable.permutated;
898 s->block_last_index[n] = i;
901 if(rvlc) rl = &rvlc_rl_inter;
902 else rl = &ff_h263_rl_inter;
904 scan_table = s->intra_scantable.permutated;
910 rl_vlc = rvlc_rl_inter.rl_vlc[0];
912 rl_vlc = ff_h263_rl_inter.rl_vlc[0];
915 qmul = s->qscale << 1;
916 qadd = (s->qscale - 1) | 1;
918 rl_vlc = rvlc_rl_inter.rl_vlc[s->qscale];
920 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
925 OPEN_READER(re, &s->gb);
927 UPDATE_CACHE(re, &s->gb);
928 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
932 if(SHOW_UBITS(re, &s->gb, 1)==0){
933 av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in rvlc esc\n");
935 }; SKIP_CACHE(re, &s->gb, 1);
937 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
938 run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6);
939 SKIP_COUNTER(re, &s->gb, 1+1+6);
940 UPDATE_CACHE(re, &s->gb);
942 if(SHOW_UBITS(re, &s->gb, 1)==0){
943 av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in rvlc esc\n");
945 }; SKIP_CACHE(re, &s->gb, 1);
947 level= SHOW_UBITS(re, &s->gb, 11); SKIP_CACHE(re, &s->gb, 11);
949 if(SHOW_UBITS(re, &s->gb, 5)!=0x10){
950 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
952 }; SKIP_CACHE(re, &s->gb, 5);
954 level= level * qmul + qadd;
955 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_CACHE(re, &s->gb, 1);
956 SKIP_COUNTER(re, &s->gb, 1+11+5+1);
962 cache= GET_CACHE(re, &s->gb);
967 if (cache&0x80000000) {
968 if (cache&0x40000000) {
970 SKIP_CACHE(re, &s->gb, 2);
971 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
972 run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6);
973 SKIP_COUNTER(re, &s->gb, 2+1+6);
974 UPDATE_CACHE(re, &s->gb);
977 level= SHOW_SBITS(re, &s->gb, 12); LAST_SKIP_BITS(re, &s->gb, 12);
979 if(SHOW_UBITS(re, &s->gb, 1)==0){
980 av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in 3. esc\n");
982 }; SKIP_CACHE(re, &s->gb, 1);
984 level= SHOW_SBITS(re, &s->gb, 12); SKIP_CACHE(re, &s->gb, 12);
986 if(SHOW_UBITS(re, &s->gb, 1)==0){
987 av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in 3. esc\n");
989 }; LAST_SKIP_CACHE(re, &s->gb, 1);
991 SKIP_COUNTER(re, &s->gb, 1+12+1);
995 if(s->error_recognition >= FF_ER_COMPLIANT){
996 const int abs_level= FFABS(level);
997 if(abs_level<=MAX_LEVEL && run<=MAX_RUN){
998 const int run1= run - rl->max_run[last][abs_level] - 1;
999 if(abs_level <= rl->max_level[last][run]){
1000 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1003 if(s->error_recognition > FF_ER_COMPLIANT){
1004 if(abs_level <= rl->max_level[last][run]*2){
1005 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1008 if(run1 >= 0 && abs_level <= rl->max_level[last][run1]){
1009 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1016 if (level>0) level= level * qmul + qadd;
1017 else level= level * qmul - qadd;
1019 if((unsigned)(level + 2048) > 4095){
1020 if(s->error_recognition > FF_ER_COMPLIANT){
1021 if(level > 2560 || level<-2560){
1022 av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc, qp=%d\n", s->qscale);
1026 level= level<0 ? -2048 : 2047;
1033 SKIP_BITS(re, &s->gb, 2);
1034 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1035 i+= run + rl->max_run[run>>7][level/qmul] +1; //FIXME opt indexing
1036 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1037 LAST_SKIP_BITS(re, &s->gb, 1);
1041 SKIP_BITS(re, &s->gb, 1);
1042 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1044 level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
1045 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1046 LAST_SKIP_BITS(re, &s->gb, 1);
1051 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1052 LAST_SKIP_BITS(re, &s->gb, 1);
1057 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1061 block[scan_table[i]] = level;
1065 block[scan_table[i]] = level;
1067 CLOSE_READER(re, &s->gb);
1071 if(!s->use_intra_dc_vlc){
1072 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1074 i -= i>>31; //if(i == -1) i=0;
1077 mpeg4_pred_ac(s, block, n, dc_pred_dir);
1079 i = 63; /* XXX: not optimal */
1082 s->block_last_index[n] = i;
1087 * decode partition C of one MB.
1088 * @return <0 if an error occurred
1090 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, DCTELEM block[6][64])
1093 const int xy= s->mb_x + s->mb_y*s->mb_stride;
1095 mb_type= s->current_picture.mb_type[xy];
1096 cbp = s->cbp_table[xy];
1098 s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
1100 if(s->current_picture.qscale_table[xy] != s->qscale){
1101 ff_set_qscale(s, s->current_picture.qscale_table[xy] );
1104 if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type==AV_PICTURE_TYPE_S) {
1107 s->mv[0][i][0] = s->current_picture.motion_val[0][ s->block_index[i] ][0];
1108 s->mv[0][i][1] = s->current_picture.motion_val[0][ s->block_index[i] ][1];
1110 s->mb_intra = IS_INTRA(mb_type);
1112 if (IS_SKIP(mb_type)) {
1115 s->block_last_index[i] = -1;
1116 s->mv_dir = MV_DIR_FORWARD;
1117 s->mv_type = MV_TYPE_16X16;
1118 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
1125 }else if(s->mb_intra){
1126 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1127 }else if(!s->mb_intra){
1128 // s->mcsel= 0; //FIXME do we need to init that
1130 s->mv_dir = MV_DIR_FORWARD;
1131 if (IS_8X8(mb_type)) {
1132 s->mv_type = MV_TYPE_8X8;
1134 s->mv_type = MV_TYPE_16X16;
1137 } else { /* I-Frame */
1139 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1142 if (!IS_SKIP(mb_type)) {
1144 s->dsp.clear_blocks(s->block[0]);
1145 /* decode each block */
1146 for (i = 0; i < 6; i++) {
1147 if(mpeg4_decode_block(s, block[i], i, cbp&32, s->mb_intra, s->rvlc) < 0){
1148 av_log(s->avctx, AV_LOG_ERROR, "texture corrupted at %d %d %d\n", s->mb_x, s->mb_y, s->mb_intra);
1155 /* per-MB end of slice check */
1157 if(--s->mb_num_left <= 0){
1158 if(mpeg4_is_resync(s))
1163 if(mpeg4_is_resync(s)){
1164 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1165 if(s->cbp_table[xy+delta])
1172 static int mpeg4_decode_mb(MpegEncContext *s,
1173 DCTELEM block[6][64])
1175 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1177 static int8_t quant_tab[4] = { -1, -2, 1, 2 };
1178 const int xy= s->mb_x + s->mb_y * s->mb_stride;
1180 assert(s->h263_pred);
1182 if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type==AV_PICTURE_TYPE_S) {
1184 if (get_bits1(&s->gb)) {
1188 s->block_last_index[i] = -1;
1189 s->mv_dir = MV_DIR_FORWARD;
1190 s->mv_type = MV_TYPE_16X16;
1191 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
1192 s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
1194 s->mv[0][0][0]= get_amv(s, 0);
1195 s->mv[0][0][1]= get_amv(s, 1);
1199 s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
1207 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1209 av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1214 s->dsp.clear_blocks(s->block[0]);
1216 s->mb_intra = ((cbpc & 4) != 0);
1217 if (s->mb_intra) goto intra;
1219 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
1220 s->mcsel= get_bits1(&s->gb);
1222 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1224 cbp = (cbpc & 3) | (cbpy << 2);
1226 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1228 if((!s->progressive_sequence) && (cbp || (s->workaround_bugs&FF_BUG_XVID_ILACE)))
1229 s->interlaced_dct= get_bits1(&s->gb);
1231 s->mv_dir = MV_DIR_FORWARD;
1232 if ((cbpc & 16) == 0) {
1234 s->current_picture.mb_type[xy]= MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
1235 /* 16x16 global motion prediction */
1236 s->mv_type = MV_TYPE_16X16;
1239 s->mv[0][0][0] = mx;
1240 s->mv[0][0][1] = my;
1241 }else if((!s->progressive_sequence) && get_bits1(&s->gb)){
1242 s->current_picture.mb_type[xy]= MB_TYPE_16x8 | MB_TYPE_L0 | MB_TYPE_INTERLACED;
1243 /* 16x8 field motion prediction */
1244 s->mv_type= MV_TYPE_FIELD;
1246 s->field_select[0][0]= get_bits1(&s->gb);
1247 s->field_select[0][1]= get_bits1(&s->gb);
1249 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1252 mx = h263_decode_motion(s, pred_x, s->f_code);
1256 my = h263_decode_motion(s, pred_y/2, s->f_code);
1260 s->mv[0][i][0] = mx;
1261 s->mv[0][i][1] = my;
1264 s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0;
1265 /* 16x16 motion prediction */
1266 s->mv_type = MV_TYPE_16X16;
1267 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1268 mx = h263_decode_motion(s, pred_x, s->f_code);
1273 my = h263_decode_motion(s, pred_y, s->f_code);
1277 s->mv[0][0][0] = mx;
1278 s->mv[0][0][1] = my;
1281 s->current_picture.mb_type[xy]= MB_TYPE_8x8 | MB_TYPE_L0;
1282 s->mv_type = MV_TYPE_8X8;
1284 mot_val = h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1285 mx = h263_decode_motion(s, pred_x, s->f_code);
1289 my = h263_decode_motion(s, pred_y, s->f_code);
1292 s->mv[0][i][0] = mx;
1293 s->mv[0][i][1] = my;
1298 } else if(s->pict_type==AV_PICTURE_TYPE_B) {
1299 int modb1; // first bit of modb
1300 int modb2; // second bit of modb
1303 s->mb_intra = 0; //B-frames never contain intra blocks
1304 s->mcsel=0; // ... true gmc blocks
1308 s->last_mv[i][0][0]=
1309 s->last_mv[i][0][1]=
1310 s->last_mv[i][1][0]=
1311 s->last_mv[i][1][1]= 0;
1314 ff_thread_await_progress((AVFrame*)s->next_picture_ptr, s->mb_y, 0);
1317 /* if we skipped it in the future P Frame than skip it now too */
1318 s->mb_skipped= s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1323 s->block_last_index[i] = -1;
1325 s->mv_dir = MV_DIR_FORWARD;
1326 s->mv_type = MV_TYPE_16X16;
1331 s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
1335 modb1= get_bits1(&s->gb);
1337 mb_type= MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1; //like MB_TYPE_B_DIRECT but no vectors coded
1340 modb2= get_bits1(&s->gb);
1341 mb_type= get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1343 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1346 mb_type= mb_type_b_map[ mb_type ];
1349 s->dsp.clear_blocks(s->block[0]);
1350 cbp= get_bits(&s->gb, 6);
1353 if ((!IS_DIRECT(mb_type)) && cbp) {
1354 if(get_bits1(&s->gb)){
1355 ff_set_qscale(s, s->qscale + get_bits1(&s->gb)*4 - 2);
1359 if(!s->progressive_sequence){
1361 s->interlaced_dct= get_bits1(&s->gb);
1363 if(!IS_DIRECT(mb_type) && get_bits1(&s->gb)){
1364 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1365 mb_type &= ~MB_TYPE_16x16;
1367 if(USES_LIST(mb_type, 0)){
1368 s->field_select[0][0]= get_bits1(&s->gb);
1369 s->field_select[0][1]= get_bits1(&s->gb);
1371 if(USES_LIST(mb_type, 1)){
1372 s->field_select[1][0]= get_bits1(&s->gb);
1373 s->field_select[1][1]= get_bits1(&s->gb);
1379 if((mb_type & (MB_TYPE_DIRECT2|MB_TYPE_INTERLACED)) == 0){
1380 s->mv_type= MV_TYPE_16X16;
1382 if(USES_LIST(mb_type, 0)){
1383 s->mv_dir = MV_DIR_FORWARD;
1385 mx = h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1386 my = h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1387 s->last_mv[0][1][0]= s->last_mv[0][0][0]= s->mv[0][0][0] = mx;
1388 s->last_mv[0][1][1]= s->last_mv[0][0][1]= s->mv[0][0][1] = my;
1391 if(USES_LIST(mb_type, 1)){
1392 s->mv_dir |= MV_DIR_BACKWARD;
1394 mx = h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1395 my = h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1396 s->last_mv[1][1][0]= s->last_mv[1][0][0]= s->mv[1][0][0] = mx;
1397 s->last_mv[1][1][1]= s->last_mv[1][0][1]= s->mv[1][0][1] = my;
1399 }else if(!IS_DIRECT(mb_type)){
1400 s->mv_type= MV_TYPE_FIELD;
1402 if(USES_LIST(mb_type, 0)){
1403 s->mv_dir = MV_DIR_FORWARD;
1406 mx = h263_decode_motion(s, s->last_mv[0][i][0] , s->f_code);
1407 my = h263_decode_motion(s, s->last_mv[0][i][1]/2, s->f_code);
1408 s->last_mv[0][i][0]= s->mv[0][i][0] = mx;
1409 s->last_mv[0][i][1]= (s->mv[0][i][1] = my)*2;
1413 if(USES_LIST(mb_type, 1)){
1414 s->mv_dir |= MV_DIR_BACKWARD;
1417 mx = h263_decode_motion(s, s->last_mv[1][i][0] , s->b_code);
1418 my = h263_decode_motion(s, s->last_mv[1][i][1]/2, s->b_code);
1419 s->last_mv[1][i][0]= s->mv[1][i][0] = mx;
1420 s->last_mv[1][i][1]= (s->mv[1][i][1] = my)*2;
1426 if(IS_DIRECT(mb_type)){
1427 if(IS_SKIP(mb_type))
1430 mx = h263_decode_motion(s, 0, 1);
1431 my = h263_decode_motion(s, 0, 1);
1434 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1435 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1437 s->current_picture.mb_type[xy]= mb_type;
1438 } else { /* I-Frame */
1440 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1442 av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1450 s->ac_pred = get_bits1(&s->gb);
1452 s->current_picture.mb_type[xy]= MB_TYPE_INTRA | MB_TYPE_ACPRED;
1454 s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
1456 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1458 av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1461 cbp = (cbpc & 3) | (cbpy << 2);
1463 s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
1466 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1469 if(!s->progressive_sequence)
1470 s->interlaced_dct= get_bits1(&s->gb);
1472 s->dsp.clear_blocks(s->block[0]);
1473 /* decode each block */
1474 for (i = 0; i < 6; i++) {
1475 if (mpeg4_decode_block(s, block[i], i, cbp&32, 1, 0) < 0)
1482 /* decode each block */
1483 for (i = 0; i < 6; i++) {
1484 if (mpeg4_decode_block(s, block[i], i, cbp&32, 0, 0) < 0)
1490 /* per-MB end of slice check */
1491 if(s->codec_id==CODEC_ID_MPEG4){
1492 if(mpeg4_is_resync(s)){
1493 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1495 if(s->pict_type==AV_PICTURE_TYPE_B){
1496 ff_thread_await_progress((AVFrame*)s->next_picture_ptr,
1497 (s->mb_x + delta >= s->mb_width) ? FFMIN(s->mb_y+1, s->mb_height-1) : s->mb_y, 0);
1500 if(s->pict_type==AV_PICTURE_TYPE_B && s->next_picture.mbskip_table[xy + delta])
1510 static int mpeg4_decode_gop_header(MpegEncContext * s, GetBitContext *gb){
1511 int hours, minutes, seconds;
1513 if(!show_bits(gb, 23)){
1514 av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1518 hours= get_bits(gb, 5);
1519 minutes= get_bits(gb, 6);
1521 seconds= get_bits(gb, 6);
1523 s->time_base= seconds + 60*(minutes + 60*hours);
1531 static int decode_vol_header(MpegEncContext *s, GetBitContext *gb){
1532 int width, height, vo_ver_id;
1535 skip_bits(gb, 1); /* random access */
1536 s->vo_type= get_bits(gb, 8);
1537 if (get_bits1(gb) != 0) { /* is_ol_id */
1538 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1539 skip_bits(gb, 3); /* vo_priority */
1543 s->aspect_ratio_info= get_bits(gb, 4);
1544 if(s->aspect_ratio_info == FF_ASPECT_EXTENDED){
1545 s->avctx->sample_aspect_ratio.num= get_bits(gb, 8); // par_width
1546 s->avctx->sample_aspect_ratio.den= get_bits(gb, 8); // par_height
1548 s->avctx->sample_aspect_ratio= ff_h263_pixel_aspect[s->aspect_ratio_info];
1551 if ((s->vol_control_parameters=get_bits1(gb))) { /* vol control parameter */
1552 int chroma_format= get_bits(gb, 2);
1553 if(chroma_format!=CHROMA_420){
1554 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1556 s->low_delay= get_bits1(gb);
1557 if(get_bits1(gb)){ /* vbv parameters */
1558 get_bits(gb, 15); /* first_half_bitrate */
1559 skip_bits1(gb); /* marker */
1560 get_bits(gb, 15); /* latter_half_bitrate */
1561 skip_bits1(gb); /* marker */
1562 get_bits(gb, 15); /* first_half_vbv_buffer_size */
1563 skip_bits1(gb); /* marker */
1564 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1565 get_bits(gb, 11); /* first_half_vbv_occupancy */
1566 skip_bits1(gb); /* marker */
1567 get_bits(gb, 15); /* latter_half_vbv_occupancy */
1568 skip_bits1(gb); /* marker */
1571 // set low delay flag only once the smartest? low delay detection won't be overriden
1572 if(s->picture_number==0)
1576 s->shape = get_bits(gb, 2); /* vol shape */
1577 if(s->shape != RECT_SHAPE) av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1578 if(s->shape == GRAY_SHAPE && vo_ver_id != 1){
1579 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1580 skip_bits(gb, 4); //video_object_layer_shape_extension
1583 check_marker(gb, "before time_increment_resolution");
1585 s->avctx->time_base.den = get_bits(gb, 16);
1586 if(!s->avctx->time_base.den){
1587 av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n");
1588 s->avctx->time_base.num = 0;
1592 s->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
1593 if (s->time_increment_bits < 1)
1594 s->time_increment_bits = 1;
1596 check_marker(gb, "before fixed_vop_rate");
1598 if (get_bits1(gb) != 0) { /* fixed_vop_rate */
1599 s->avctx->time_base.num = get_bits(gb, s->time_increment_bits);
1601 s->avctx->time_base.num = 1;
1605 if (s->shape != BIN_ONLY_SHAPE) {
1606 if (s->shape == RECT_SHAPE) {
1607 skip_bits1(gb); /* marker */
1608 width = get_bits(gb, 13);
1609 skip_bits1(gb); /* marker */
1610 height = get_bits(gb, 13);
1611 skip_bits1(gb); /* marker */
1612 if(width && height && !(s->width && s->codec_tag == AV_RL32("MP4S"))){ /* they should be non zero but who knows ... */
1618 s->progressive_sequence=
1619 s->progressive_frame= get_bits1(gb)^1;
1620 s->interlaced_dct=0;
1621 if(!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1622 av_log(s->avctx, AV_LOG_INFO, "MPEG4 OBMC not supported (very likely buggy encoder)\n"); /* OBMC Disable */
1623 if (vo_ver_id == 1) {
1624 s->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1626 s->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1628 if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1629 if(s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE){
1630 if(s->vol_sprite_usage==STATIC_SPRITE){
1631 s->sprite_width = get_bits(gb, 13);
1632 skip_bits1(gb); /* marker */
1633 s->sprite_height= get_bits(gb, 13);
1634 skip_bits1(gb); /* marker */
1635 s->sprite_left = get_bits(gb, 13);
1636 skip_bits1(gb); /* marker */
1637 s->sprite_top = get_bits(gb, 13);
1638 skip_bits1(gb); /* marker */
1640 s->num_sprite_warping_points= get_bits(gb, 6);
1641 if(s->num_sprite_warping_points > 3){
1642 av_log(s->avctx, AV_LOG_ERROR, "%d sprite_warping_points\n", s->num_sprite_warping_points);
1643 s->num_sprite_warping_points= 0;
1646 s->sprite_warping_accuracy = get_bits(gb, 2);
1647 s->sprite_brightness_change= get_bits1(gb);
1648 if(s->vol_sprite_usage==STATIC_SPRITE)
1649 s->low_latency_sprite= get_bits1(gb);
1651 // FIXME sadct disable bit if verid!=1 && shape not rect
1653 if (get_bits1(gb) == 1) { /* not_8_bit */
1654 s->quant_precision = get_bits(gb, 4); /* quant_precision */
1655 if(get_bits(gb, 4)!=8) av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n"); /* bits_per_pixel */
1656 if(s->quant_precision!=5) av_log(s->avctx, AV_LOG_ERROR, "quant precision %d\n", s->quant_precision);
1658 s->quant_precision = 5;
1661 // FIXME a bunch of grayscale shape things
1663 if((s->mpeg_quant=get_bits1(gb))){ /* vol_quant_type */
1666 /* load default matrixes */
1667 for(i=0; i<64; i++){
1668 int j= s->dsp.idct_permutation[i];
1669 v= ff_mpeg4_default_intra_matrix[i];
1670 s->intra_matrix[j]= v;
1671 s->chroma_intra_matrix[j]= v;
1673 v= ff_mpeg4_default_non_intra_matrix[i];
1674 s->inter_matrix[j]= v;
1675 s->chroma_inter_matrix[j]= v;
1678 /* load custom intra matrix */
1681 for(i=0; i<64; i++){
1687 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1688 s->intra_matrix[j]= v;
1689 s->chroma_intra_matrix[j]= v;
1692 /* replicate last value */
1694 int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1695 s->intra_matrix[j]= last;
1696 s->chroma_intra_matrix[j]= last;
1700 /* load custom non intra matrix */
1703 for(i=0; i<64; i++){
1709 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1710 s->inter_matrix[j]= v;
1711 s->chroma_inter_matrix[j]= v;
1714 /* replicate last value */
1716 int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1717 s->inter_matrix[j]= last;
1718 s->chroma_inter_matrix[j]= last;
1722 // FIXME a bunch of grayscale shape things
1726 s->quarter_sample= get_bits1(gb);
1727 else s->quarter_sample=0;
1730 int pos= get_bits_count(gb);
1731 int estimation_method= get_bits(gb, 2);
1732 if(estimation_method<2){
1734 s->cplx_estimation_trash_i += 8*get_bits1(gb); //opaque
1735 s->cplx_estimation_trash_i += 8*get_bits1(gb); //transparent
1736 s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_cae
1737 s->cplx_estimation_trash_i += 8*get_bits1(gb); //inter_cae
1738 s->cplx_estimation_trash_i += 8*get_bits1(gb); //no_update
1739 s->cplx_estimation_trash_i += 8*get_bits1(gb); //upampling
1742 s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_blocks
1743 s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter_blocks
1744 s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter4v_blocks
1745 s->cplx_estimation_trash_i += 8*get_bits1(gb); //not coded blocks
1747 if(!check_marker(gb, "in complexity estimation part 1")){
1748 skip_bits_long(gb, pos - get_bits_count(gb));
1752 s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_coeffs
1753 s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_lines
1754 s->cplx_estimation_trash_i += 8*get_bits1(gb); //vlc_syms
1755 s->cplx_estimation_trash_i += 4*get_bits1(gb); //vlc_bits
1758 s->cplx_estimation_trash_p += 8*get_bits1(gb); //apm
1759 s->cplx_estimation_trash_p += 8*get_bits1(gb); //npm
1760 s->cplx_estimation_trash_b += 8*get_bits1(gb); //interpolate_mc_q
1761 s->cplx_estimation_trash_p += 8*get_bits1(gb); //forwback_mc_q
1762 s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel2
1763 s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel4
1765 if(!check_marker(gb, "in complexity estimation part 2")){
1766 skip_bits_long(gb, pos - get_bits_count(gb));
1769 if(estimation_method==1){
1770 s->cplx_estimation_trash_i += 8*get_bits1(gb); //sadct
1771 s->cplx_estimation_trash_p += 8*get_bits1(gb); //qpel
1774 av_log(s->avctx, AV_LOG_ERROR, "Invalid Complexity estimation method %d\n", estimation_method);
1777 s->cplx_estimation_trash_i=
1778 s->cplx_estimation_trash_p=
1779 s->cplx_estimation_trash_b= 0;
1782 s->resync_marker= !get_bits1(gb); /* resync_marker_disabled */
1784 s->data_partitioning= get_bits1(gb);
1785 if(s->data_partitioning){
1786 s->rvlc= get_bits1(gb);
1789 if(vo_ver_id != 1) {
1790 s->new_pred= get_bits1(gb);
1792 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
1793 skip_bits(gb, 2); /* requested upstream message type */
1794 skip_bits1(gb); /* newpred segment type */
1796 s->reduced_res_vop= get_bits1(gb);
1797 if(s->reduced_res_vop) av_log(s->avctx, AV_LOG_ERROR, "reduced resolution VOP not supported\n");
1801 s->reduced_res_vop= 0;
1804 s->scalability= get_bits1(gb);
1806 if (s->scalability) {
1807 GetBitContext bak= *gb;
1809 int ref_layer_sampling_dir;
1810 int h_sampling_factor_n;
1811 int h_sampling_factor_m;
1812 int v_sampling_factor_n;
1813 int v_sampling_factor_m;
1815 s->hierachy_type= get_bits1(gb);
1816 ref_layer_id= get_bits(gb, 4);
1817 ref_layer_sampling_dir= get_bits1(gb);
1818 h_sampling_factor_n= get_bits(gb, 5);
1819 h_sampling_factor_m= get_bits(gb, 5);
1820 v_sampling_factor_n= get_bits(gb, 5);
1821 v_sampling_factor_m= get_bits(gb, 5);
1822 s->enhancement_type= get_bits1(gb);
1824 if( h_sampling_factor_n==0 || h_sampling_factor_m==0
1825 || v_sampling_factor_n==0 || v_sampling_factor_m==0){
1826 /* illegal scalability header (VERY broken encoder),
1827 * trying to workaround */
1831 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
1833 // bin shape stuff FIXME
1840 * decodes the user data stuff in the header.
1841 * Also initializes divx/xvid/lavc_version/build.
1843 static int decode_user_data(MpegEncContext *s, GetBitContext *gb){
1847 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
1850 for(i=0; i<255 && get_bits_count(gb) < gb->size_in_bits; i++){
1851 if(show_bits(gb, 23) == 0) break;
1852 buf[i]= get_bits(gb, 8);
1856 /* divx detection */
1857 e=sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
1859 e=sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
1861 s->divx_version= ver;
1862 s->divx_build= build;
1863 s->divx_packed= e==3 && last=='p';
1864 if(s->divx_packed && !s->showed_packed_warning) {
1865 av_log(s->avctx, AV_LOG_WARNING, "Invalid and inefficient vfw-avi packed B frames detected\n");
1866 s->showed_packed_warning=1;
1870 /* ffmpeg detection */
1871 e=sscanf(buf, "FFmpe%*[^b]b%d", &build)+3;
1873 e=sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
1875 e=sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3)+1;
1877 build= (ver<<16) + (ver2<<8) + ver3;
1880 if(strcmp(buf, "ffmpeg")==0){
1881 s->lavc_build= 4600;
1885 s->lavc_build= build;
1888 /* Xvid detection */
1889 e=sscanf(buf, "XviD%d", &build);
1891 s->xvid_build= build;
1897 static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
1898 int time_incr, time_increment;
1900 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
1901 if(s->pict_type==AV_PICTURE_TYPE_B && s->low_delay && s->vol_control_parameters==0 && !(s->flags & CODEC_FLAG_LOW_DELAY)){
1902 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n");
1906 s->partitioned_frame= s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_B;
1907 if(s->partitioned_frame)
1908 s->decode_mb= mpeg4_decode_partitioned_mb;
1910 s->decode_mb= mpeg4_decode_mb;
1913 while (get_bits1(gb) != 0)
1916 check_marker(gb, "before time_increment");
1918 if(s->time_increment_bits==0 || !(show_bits(gb, s->time_increment_bits+1)&1)){
1919 av_log(s->avctx, AV_LOG_ERROR, "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
1921 for(s->time_increment_bits=1 ;s->time_increment_bits<16; s->time_increment_bits++){
1922 if ( s->pict_type == AV_PICTURE_TYPE_P
1923 || (s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE)) {
1924 if((show_bits(gb, s->time_increment_bits+6)&0x37) == 0x30) break;
1926 if((show_bits(gb, s->time_increment_bits+5)&0x1F) == 0x18) break;
1929 av_log(s->avctx, AV_LOG_ERROR, "my guess is %d bits ;)\n",s->time_increment_bits);
1932 if(IS_3IV1) time_increment= get_bits1(gb); //FIXME investigate further
1933 else time_increment= get_bits(gb, s->time_increment_bits);
1935 if(s->pict_type!=AV_PICTURE_TYPE_B){
1936 s->last_time_base= s->time_base;
1937 s->time_base+= time_incr;
1938 s->time= s->time_base*s->avctx->time_base.den + time_increment;
1939 if(s->workaround_bugs&FF_BUG_UMP4){
1940 if(s->time < s->last_non_b_time){
1941 /* header is not mpeg-4-compatible, broken encoder,
1942 * trying to workaround */
1944 s->time+= s->avctx->time_base.den;
1947 s->pp_time= s->time - s->last_non_b_time;
1948 s->last_non_b_time= s->time;
1950 s->time= (s->last_time_base + time_incr)*s->avctx->time_base.den + time_increment;
1951 s->pb_time= s->pp_time - (s->last_non_b_time - s->time);
1952 if(s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0){
1953 /* messed up order, maybe after seeking? skipping current b-frame */
1954 return FRAME_SKIPPED;
1956 ff_mpeg4_init_direct_mv(s);
1958 if(s->t_frame==0) s->t_frame= s->pb_time;
1959 if(s->t_frame==0) s->t_frame=1; // 1/0 protection
1960 s->pp_field_time= ( ROUNDED_DIV(s->last_non_b_time, s->t_frame)
1961 - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
1962 s->pb_field_time= ( ROUNDED_DIV(s->time, s->t_frame)
1963 - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
1964 if(!s->progressive_sequence){
1965 if(s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1)
1966 return FRAME_SKIPPED;
1970 if(s->avctx->time_base.num)
1971 s->current_picture_ptr->pts= (s->time + s->avctx->time_base.num/2) / s->avctx->time_base.num;
1973 s->current_picture_ptr->pts= AV_NOPTS_VALUE;
1974 if(s->avctx->debug&FF_DEBUG_PTS)
1975 av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n", s->current_picture_ptr->pts);
1977 check_marker(gb, "before vop_coded");
1980 if (get_bits1(gb) != 1){
1981 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
1982 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
1983 return FRAME_SKIPPED;
1985 if (s->shape != BIN_ONLY_SHAPE && ( s->pict_type == AV_PICTURE_TYPE_P
1986 || (s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE))) {
1987 /* rounding type for motion estimation */
1988 s->no_rounding = get_bits1(gb);
1992 //FIXME reduced res stuff
1994 if (s->shape != RECT_SHAPE) {
1995 if (s->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
1996 int width, height, hor_spat_ref, ver_spat_ref;
1998 width = get_bits(gb, 13);
1999 skip_bits1(gb); /* marker */
2000 height = get_bits(gb, 13);
2001 skip_bits1(gb); /* marker */
2002 hor_spat_ref = get_bits(gb, 13); /* hor_spat_ref */
2003 skip_bits1(gb); /* marker */
2004 ver_spat_ref = get_bits(gb, 13); /* ver_spat_ref */
2006 skip_bits1(gb); /* change_CR_disable */
2008 if (get_bits1(gb) != 0) {
2009 skip_bits(gb, 8); /* constant_alpha_value */
2012 //FIXME complexity estimation stuff
2014 if (s->shape != BIN_ONLY_SHAPE) {
2015 skip_bits_long(gb, s->cplx_estimation_trash_i);
2016 if(s->pict_type != AV_PICTURE_TYPE_I)
2017 skip_bits_long(gb, s->cplx_estimation_trash_p);
2018 if(s->pict_type == AV_PICTURE_TYPE_B)
2019 skip_bits_long(gb, s->cplx_estimation_trash_b);
2021 s->intra_dc_threshold= mpeg4_dc_threshold[ get_bits(gb, 3) ];
2022 if(!s->progressive_sequence){
2023 s->top_field_first= get_bits1(gb);
2024 s->alternate_scan= get_bits1(gb);
2026 s->alternate_scan= 0;
2029 if(s->alternate_scan){
2030 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
2031 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
2032 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2033 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2035 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
2036 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
2037 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2038 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2041 if(s->pict_type == AV_PICTURE_TYPE_S && (s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE)){
2042 mpeg4_decode_sprite_trajectory(s, gb);
2043 if(s->sprite_brightness_change) av_log(s->avctx, AV_LOG_ERROR, "sprite_brightness_change not supported\n");
2044 if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2047 if (s->shape != BIN_ONLY_SHAPE) {
2048 s->chroma_qscale= s->qscale = get_bits(gb, s->quant_precision);
2050 av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (qscale=0)\n");
2051 return -1; // makes no sense to continue, as there is nothing left from the image then
2054 if (s->pict_type != AV_PICTURE_TYPE_I) {
2055 s->f_code = get_bits(gb, 3); /* fcode_for */
2057 av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (f_code=0)\n");
2058 return -1; // makes no sense to continue, as the MV decoding will break very quickly
2063 if (s->pict_type == AV_PICTURE_TYPE_B) {
2064 s->b_code = get_bits(gb, 3);
2068 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2069 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",
2070 s->qscale, s->f_code, s->b_code,
2071 s->pict_type == AV_PICTURE_TYPE_I ? "I" : (s->pict_type == AV_PICTURE_TYPE_P ? "P" : (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
2072 gb->size_in_bits,s->progressive_sequence, s->alternate_scan, s->top_field_first,
2073 s->quarter_sample ? "q" : "h", s->data_partitioning, s->resync_marker, s->num_sprite_warping_points,
2074 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);
2077 if(!s->scalability){
2078 if (s->shape!=RECT_SHAPE && s->pict_type!=AV_PICTURE_TYPE_I) {
2079 skip_bits1(gb); // vop shape coding type
2082 if(s->enhancement_type){
2083 int load_backward_shape= get_bits1(gb);
2084 if(load_backward_shape){
2085 av_log(s->avctx, AV_LOG_ERROR, "load backward shape isn't supported\n");
2088 skip_bits(gb, 2); //ref_select_code
2091 /* detect buggy encoders which don't set the low_delay flag (divx4/xvid/opendivx)*/
2092 // note we cannot detect divx5 without b-frames easily (although it's buggy too)
2093 if(s->vo_type==0 && s->vol_control_parameters==0 && s->divx_version==-1 && s->picture_number==0){
2094 av_log(s->avctx, AV_LOG_WARNING, "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2098 s->picture_number++; // better than pic number==0 always ;)
2100 s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table; //FIXME add short header support
2101 s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
2103 if(s->workaround_bugs&FF_BUG_EDGE){
2104 s->h_edge_pos= s->width;
2105 s->v_edge_pos= s->height;
2111 * decode mpeg4 headers
2112 * @return <0 if no VOP found (or a damaged one)
2113 * FRAME_SKIPPED if a not coded VOP is found
2114 * 0 if a VOP is found
2116 int ff_mpeg4_decode_picture_header(MpegEncContext * s, GetBitContext *gb)
2120 /* search next start code */
2123 if(s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630){
2125 if(get_bits(gb, 8) == 0xF0)
2131 if(get_bits_count(gb) >= gb->size_in_bits){
2132 if(gb->size_in_bits==8 && (s->divx_version>=0 || s->xvid_build>=0)){
2133 av_log(s->avctx, AV_LOG_WARNING, "frame skip %d\n", gb->size_in_bits);
2134 return FRAME_SKIPPED; //divx bug
2136 return -1; //end of stream
2139 /* use the bits after the test */
2140 v = get_bits(gb, 8);
2141 startcode = ((startcode << 8) | v) & 0xffffffff;
2143 if((startcode&0xFFFFFF00) != 0x100)
2144 continue; //no startcode
2146 if(s->avctx->debug&FF_DEBUG_STARTCODE){
2147 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2148 if (startcode<=0x11F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2149 else if(startcode<=0x12F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2150 else if(startcode<=0x13F) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2151 else if(startcode<=0x15F) av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2152 else if(startcode<=0x1AF) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2153 else if(startcode==0x1B0) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2154 else if(startcode==0x1B1) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2155 else if(startcode==0x1B2) av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2156 else if(startcode==0x1B3) av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2157 else if(startcode==0x1B4) av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2158 else if(startcode==0x1B5) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2159 else if(startcode==0x1B6) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2160 else if(startcode==0x1B7) av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2161 else if(startcode==0x1B8) av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2162 else if(startcode==0x1B9) av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2163 else if(startcode==0x1BA) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2164 else if(startcode==0x1BB) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2165 else if(startcode==0x1BC) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2166 else if(startcode==0x1BD) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2167 else if(startcode==0x1BE) av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2168 else if(startcode==0x1BF) av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2169 else if(startcode==0x1C0) av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2170 else if(startcode==0x1C1) av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2171 else if(startcode==0x1C2) av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2172 else if(startcode==0x1C3) av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2173 else if(startcode<=0x1C5) av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2174 else if(startcode<=0x1FF) av_log(s->avctx, AV_LOG_DEBUG, "System start");
2175 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2178 if(startcode >= 0x120 && startcode <= 0x12F){
2179 if(decode_vol_header(s, gb) < 0)
2182 else if(startcode == USER_DATA_STARTCODE){
2183 decode_user_data(s, gb);
2185 else if(startcode == GOP_STARTCODE){
2186 mpeg4_decode_gop_header(s, gb);
2188 else if(startcode == VOP_STARTCODE){
2196 if(s->flags& CODEC_FLAG_LOW_DELAY)
2198 s->avctx->has_b_frames= !s->low_delay;
2199 return decode_vop_header(s, gb);
2202 static av_cold int decode_init(AVCodecContext *avctx)
2204 MpegEncContext *s = avctx->priv_data;
2206 static int done = 0;
2213 if((ret=ff_h263_decode_init(avctx)) < 0)
2219 init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
2220 init_rl(&rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
2221 init_rl(&rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
2222 INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
2223 INIT_VLC_RL(rvlc_rl_inter, 1072);
2224 INIT_VLC_RL(rvlc_rl_intra, 1072);
2225 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2226 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2227 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2228 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2229 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2230 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2231 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2232 &sprite_trajectory_tab[0][1], 4, 2,
2233 &sprite_trajectory_tab[0][0], 4, 2, 128);
2234 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2235 &mb_type_b_tab[0][1], 2, 1,
2236 &mb_type_b_tab[0][0], 2, 1, 16);
2240 s->low_delay = 0; //default, might be overriden in the vol header during header parsing
2241 s->decode_mb= mpeg4_decode_mb;
2242 s->time_increment_bits = 4; /* default value for broken headers */
2243 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
2248 AVCodec ff_mpeg4_decoder = {
2252 sizeof(MpegEncContext),
2256 ff_h263_decode_frame,
2257 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_FRAME_THREADS,
2258 .flush= ff_mpeg_flush,
2260 .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2261 .pix_fmts= ff_hwaccel_pixfmt_list_420,
2262 .update_thread_context= ONLY_IF_THREADS_ENABLED(ff_mpeg_update_thread_context)
2266 #if CONFIG_MPEG4_VDPAU_DECODER
2267 AVCodec ff_mpeg4_vdpau_decoder = {
2271 sizeof(MpegEncContext),
2275 ff_h263_decode_frame,
2276 CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_HWACCEL_VDPAU,
2277 .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2278 .pix_fmts= (const enum PixelFormat[]){PIX_FMT_VDPAU_MPEG4, PIX_FMT_NONE},