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 && !s->resync_marker){
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){
402 while (get_bits1(&s->gb) != 0)
405 check_marker(&s->gb, "before time_increment in video packed header");
406 skip_bits(&s->gb, s->time_increment_bits); /* time_increment */
407 check_marker(&s->gb, "before vop_coding_type in video packed header");
409 skip_bits(&s->gb, 2); /* vop coding type */
410 //FIXME not rect stuff here
412 if(s->shape != BIN_ONLY_SHAPE){
413 skip_bits(&s->gb, 3); /* intra dc vlc threshold */
414 //FIXME don't just ignore everything
415 if(s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
416 mpeg4_decode_sprite_trajectory(s, &s->gb);
417 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
420 //FIXME reduced res stuff here
422 if (s->pict_type != AV_PICTURE_TYPE_I) {
423 int f_code = get_bits(&s->gb, 3); /* fcode_for */
425 av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (f_code=0)\n");
428 if (s->pict_type == AV_PICTURE_TYPE_B) {
429 int b_code = get_bits(&s->gb, 3);
431 av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (b_code=0)\n");
436 //FIXME new-pred stuff
442 * gets the average motion vector for a GMC MB.
443 * @param n either 0 for the x component or 1 for y
444 * @return the average MV for a GMC MB
446 static inline int get_amv(MpegEncContext *s, int n){
447 int x, y, mb_v, sum, dx, dy, shift;
448 int len = 1 << (s->f_code + 4);
449 const int a= s->sprite_warping_accuracy;
451 if(s->workaround_bugs & FF_BUG_AMV)
452 len >>= s->quarter_sample;
454 if(s->real_sprite_warping_points==1){
455 if(s->divx_version==500 && s->divx_build==413)
456 sum= s->sprite_offset[0][n] / (1<<(a - s->quarter_sample));
458 sum= RSHIFT(s->sprite_offset[0][n]<<s->quarter_sample, a);
460 dx= s->sprite_delta[n][0];
461 dy= s->sprite_delta[n][1];
462 shift= s->sprite_shift[0];
463 if(n) dy -= 1<<(shift + a + 1);
464 else dx -= 1<<(shift + a + 1);
465 mb_v= s->sprite_offset[0][n] + dx*s->mb_x*16 + dy*s->mb_y*16;
478 sum= RSHIFT(sum, a+8-s->quarter_sample);
481 if (sum < -len) sum= -len;
482 else if (sum >= len) sum= len-1;
488 * decodes the dc value.
489 * @param n block index (0-3 are luma, 4-5 are chroma)
490 * @param dir_ptr the prediction direction will be stored here
491 * @return the quantized dc
493 static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
498 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
500 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
501 if (code < 0 || code > 9 /* && s->nbit<9 */){
502 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
510 level= 2*get_bits1(&s->gb)-1;
512 if(get_bits1(&s->gb))
513 level = get_bits(&s->gb, code-1) + (1<<(code-1));
515 level = -get_bits(&s->gb, code-1) - (1<<(code-1));
518 level = get_xbits(&s->gb, code);
522 if(get_bits1(&s->gb)==0){ /* marker */
523 if(s->error_recognition>=2){
524 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
531 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
535 * decodes first partition.
536 * @return number of MBs decoded or <0 if an error occurred
538 static int mpeg4_decode_partition_a(MpegEncContext *s){
540 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
542 /* decode first partition */
544 s->first_slice_line=1;
545 for(; s->mb_y<s->mb_height; s->mb_y++){
546 ff_init_block_index(s);
547 for(; s->mb_x<s->mb_width; s->mb_x++){
548 const int xy= s->mb_x + s->mb_y*s->mb_stride;
553 ff_update_block_index(s);
554 if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
555 s->first_slice_line=0;
557 if(s->pict_type==AV_PICTURE_TYPE_I){
561 if(show_bits_long(&s->gb, 19)==DC_MARKER){
565 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
567 av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
572 s->cbp_table[xy]= cbpc & 3;
573 s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
577 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
579 s->current_picture.qscale_table[xy]= s->qscale;
581 s->mbintra_table[xy]= 1;
584 int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
586 av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
590 if(dc_pred_dir) dir|=1;
592 s->pred_dir_table[xy]= dir;
593 }else{ /* P/S_TYPE */
594 int mx, my, pred_x, pred_y, bits;
595 int16_t * const mot_val= s->current_picture.motion_val[0][s->block_index[0]];
596 const int stride= s->b8_stride*2;
599 bits= show_bits(&s->gb, 17);
600 if(bits==MOTION_MARKER){
606 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
607 s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
611 s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
614 mot_val[0 ]= mot_val[2 ]=
615 mot_val[0+stride]= mot_val[2+stride]= mx;
616 mot_val[1 ]= mot_val[3 ]=
617 mot_val[1+stride]= mot_val[3+stride]= my;
619 if(s->mbintra_table[xy])
620 ff_clean_intra_table_entries(s);
624 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
626 av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
632 s->cbp_table[xy]= cbpc&(8+3); //8 is dquant
634 s->mb_intra = ((cbpc & 4) != 0);
637 s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
638 s->mbintra_table[xy]= 1;
639 mot_val[0 ]= mot_val[2 ]=
640 mot_val[0+stride]= mot_val[2+stride]= 0;
641 mot_val[1 ]= mot_val[3 ]=
642 mot_val[1+stride]= mot_val[3+stride]= 0;
644 if(s->mbintra_table[xy])
645 ff_clean_intra_table_entries(s);
647 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
648 s->mcsel= get_bits1(&s->gb);
651 if ((cbpc & 16) == 0) {
652 /* 16x16 motion prediction */
654 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
656 mx = h263_decode_motion(s, pred_x, s->f_code);
660 my = h263_decode_motion(s, pred_y, s->f_code);
663 s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0;
667 s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
670 mot_val[0 ]= mot_val[2 ] =
671 mot_val[0+stride]= mot_val[2+stride]= mx;
672 mot_val[1 ]= mot_val[3 ]=
673 mot_val[1+stride]= mot_val[3+stride]= my;
676 s->current_picture.mb_type[xy]= MB_TYPE_8x8 | MB_TYPE_L0;
678 int16_t *mot_val= h263_pred_motion(s, i, 0, &pred_x, &pred_y);
679 mx = h263_decode_motion(s, pred_x, s->f_code);
683 my = h263_decode_motion(s, pred_y, s->f_code);
700 * decode second partition.
701 * @return <0 if an error occurred
703 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count){
705 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
707 s->mb_x= s->resync_mb_x;
708 s->first_slice_line=1;
709 for(s->mb_y= s->resync_mb_y; mb_num < mb_count; s->mb_y++){
710 ff_init_block_index(s);
711 for(; mb_num < mb_count && s->mb_x<s->mb_width; s->mb_x++){
712 const int xy= s->mb_x + s->mb_y*s->mb_stride;
715 ff_update_block_index(s);
716 if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
717 s->first_slice_line=0;
719 if(s->pict_type==AV_PICTURE_TYPE_I){
720 int ac_pred= get_bits1(&s->gb);
721 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
723 av_log(s->avctx, AV_LOG_ERROR, "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
727 s->cbp_table[xy]|= cbpy<<2;
728 s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
729 }else{ /* P || S_TYPE */
730 if(IS_INTRA(s->current_picture.mb_type[xy])){
732 int ac_pred = get_bits1(&s->gb);
733 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
736 av_log(s->avctx, AV_LOG_ERROR, "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
740 if(s->cbp_table[xy] & 8) {
741 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
743 s->current_picture.qscale_table[xy]= s->qscale;
747 int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
749 av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
753 if(dc_pred_dir) dir|=1;
755 s->cbp_table[xy]&= 3; //remove dquant
756 s->cbp_table[xy]|= cbpy<<2;
757 s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
758 s->pred_dir_table[xy]= dir;
759 }else if(IS_SKIP(s->current_picture.mb_type[xy])){
760 s->current_picture.qscale_table[xy]= s->qscale;
763 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
766 av_log(s->avctx, AV_LOG_ERROR, "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
770 if(s->cbp_table[xy] & 8) {
771 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
773 s->current_picture.qscale_table[xy]= s->qscale;
775 s->cbp_table[xy]&= 3; //remove dquant
776 s->cbp_table[xy]|= (cbpy^0xf)<<2;
780 if(mb_num >= mb_count) return 0;
787 * decodes the first & second partition
788 * @return <0 if error (and sets error type in the error_status_table)
790 int ff_mpeg4_decode_partitions(MpegEncContext *s)
793 const int part_a_error= s->pict_type==AV_PICTURE_TYPE_I ? (DC_ERROR|MV_ERROR) : MV_ERROR;
794 const int part_a_end = s->pict_type==AV_PICTURE_TYPE_I ? (DC_END |MV_END) : MV_END;
796 mb_num= mpeg4_decode_partition_a(s);
798 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
802 if(s->resync_mb_x + s->resync_mb_y*s->mb_width + mb_num > s->mb_num){
803 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
804 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
808 s->mb_num_left= mb_num;
810 if(s->pict_type==AV_PICTURE_TYPE_I){
811 while(show_bits(&s->gb, 9) == 1)
812 skip_bits(&s->gb, 9);
813 if(get_bits_long(&s->gb, 19)!=DC_MARKER){
814 av_log(s->avctx, AV_LOG_ERROR, "marker missing after first I partition at %d %d\n", s->mb_x, s->mb_y);
818 while(show_bits(&s->gb, 10) == 1)
819 skip_bits(&s->gb, 10);
820 if(get_bits(&s->gb, 17)!=MOTION_MARKER){
821 av_log(s->avctx, AV_LOG_ERROR, "marker missing after first P partition at %d %d\n", s->mb_x, s->mb_y);
825 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, part_a_end);
827 if( mpeg4_decode_partition_b(s, mb_num) < 0){
828 if(s->pict_type==AV_PICTURE_TYPE_P)
829 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, DC_ERROR);
832 if(s->pict_type==AV_PICTURE_TYPE_P)
833 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, DC_END);
841 * @return <0 if an error occurred
843 static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
844 int n, int coded, int intra, int rvlc)
846 int level, i, last, run;
849 RL_VLC_ELEM * rl_vlc;
850 const uint8_t * scan_table;
853 //Note intra & rvlc should be optimized away if this is inlined
856 if(s->use_intra_dc_vlc){
858 if(s->partitioned_frame){
859 level = s->dc_val[0][ s->block_index[n] ];
860 if(n<4) level= FASTDIV((level + (s->y_dc_scale>>1)), s->y_dc_scale);
861 else level= FASTDIV((level + (s->c_dc_scale>>1)), s->c_dc_scale);
862 dc_pred_dir= (s->pred_dir_table[s->mb_x + s->mb_y*s->mb_stride]<<n)&32;
864 level = mpeg4_decode_dc(s, n, &dc_pred_dir);
872 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
879 rl_vlc = rvlc_rl_intra.rl_vlc[0];
881 rl = &ff_mpeg4_rl_intra;
882 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
885 if (dc_pred_dir == 0)
886 scan_table = s->intra_v_scantable.permutated; /* left */
888 scan_table = s->intra_h_scantable.permutated; /* top */
890 scan_table = s->intra_scantable.permutated;
897 s->block_last_index[n] = i;
900 if(rvlc) rl = &rvlc_rl_inter;
901 else rl = &ff_h263_rl_inter;
903 scan_table = s->intra_scantable.permutated;
909 rl_vlc = rvlc_rl_inter.rl_vlc[0];
911 rl_vlc = ff_h263_rl_inter.rl_vlc[0];
914 qmul = s->qscale << 1;
915 qadd = (s->qscale - 1) | 1;
917 rl_vlc = rvlc_rl_inter.rl_vlc[s->qscale];
919 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
924 OPEN_READER(re, &s->gb);
926 UPDATE_CACHE(re, &s->gb);
927 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
931 if(SHOW_UBITS(re, &s->gb, 1)==0){
932 av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in rvlc esc\n");
934 }; SKIP_CACHE(re, &s->gb, 1);
936 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
937 run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6);
938 SKIP_COUNTER(re, &s->gb, 1+1+6);
939 UPDATE_CACHE(re, &s->gb);
941 if(SHOW_UBITS(re, &s->gb, 1)==0){
942 av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in rvlc esc\n");
944 }; SKIP_CACHE(re, &s->gb, 1);
946 level= SHOW_UBITS(re, &s->gb, 11); SKIP_CACHE(re, &s->gb, 11);
948 if(SHOW_UBITS(re, &s->gb, 5)!=0x10){
949 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
951 }; SKIP_CACHE(re, &s->gb, 5);
953 level= level * qmul + qadd;
954 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_CACHE(re, &s->gb, 1);
955 SKIP_COUNTER(re, &s->gb, 1+11+5+1);
961 cache= GET_CACHE(re, &s->gb);
966 if (cache&0x80000000) {
967 if (cache&0x40000000) {
969 SKIP_CACHE(re, &s->gb, 2);
970 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
971 run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6);
972 SKIP_COUNTER(re, &s->gb, 2+1+6);
973 UPDATE_CACHE(re, &s->gb);
976 level= SHOW_SBITS(re, &s->gb, 12); LAST_SKIP_BITS(re, &s->gb, 12);
978 if(SHOW_UBITS(re, &s->gb, 1)==0){
979 av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in 3. esc\n");
981 }; SKIP_CACHE(re, &s->gb, 1);
983 level= SHOW_SBITS(re, &s->gb, 12); SKIP_CACHE(re, &s->gb, 12);
985 if(SHOW_UBITS(re, &s->gb, 1)==0){
986 av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in 3. esc\n");
988 }; LAST_SKIP_CACHE(re, &s->gb, 1);
990 SKIP_COUNTER(re, &s->gb, 1+12+1);
994 if(s->error_recognition >= FF_ER_COMPLIANT){
995 const int abs_level= FFABS(level);
996 if(abs_level<=MAX_LEVEL && run<=MAX_RUN){
997 const int run1= run - rl->max_run[last][abs_level] - 1;
998 if(abs_level <= rl->max_level[last][run]){
999 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1002 if(s->error_recognition > FF_ER_COMPLIANT){
1003 if(abs_level <= rl->max_level[last][run]*2){
1004 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1007 if(run1 >= 0 && abs_level <= rl->max_level[last][run1]){
1008 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1015 if (level>0) level= level * qmul + qadd;
1016 else level= level * qmul - qadd;
1018 if((unsigned)(level + 2048) > 4095){
1019 if(s->error_recognition > FF_ER_COMPLIANT){
1020 if(level > 2560 || level<-2560){
1021 av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc, qp=%d\n", s->qscale);
1025 level= level<0 ? -2048 : 2047;
1032 SKIP_BITS(re, &s->gb, 2);
1033 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1034 i+= run + rl->max_run[run>>7][level/qmul] +1; //FIXME opt indexing
1035 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1036 LAST_SKIP_BITS(re, &s->gb, 1);
1040 SKIP_BITS(re, &s->gb, 1);
1041 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1043 level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
1044 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1045 LAST_SKIP_BITS(re, &s->gb, 1);
1050 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1051 LAST_SKIP_BITS(re, &s->gb, 1);
1056 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1060 block[scan_table[i]] = level;
1064 block[scan_table[i]] = level;
1066 CLOSE_READER(re, &s->gb);
1070 if(!s->use_intra_dc_vlc){
1071 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1073 i -= i>>31; //if(i == -1) i=0;
1076 mpeg4_pred_ac(s, block, n, dc_pred_dir);
1078 i = 63; /* XXX: not optimal */
1081 s->block_last_index[n] = i;
1086 * decode partition C of one MB.
1087 * @return <0 if an error occurred
1089 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, DCTELEM block[6][64])
1092 const int xy= s->mb_x + s->mb_y*s->mb_stride;
1094 mb_type= s->current_picture.mb_type[xy];
1095 cbp = s->cbp_table[xy];
1097 s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
1099 if(s->current_picture.qscale_table[xy] != s->qscale){
1100 ff_set_qscale(s, s->current_picture.qscale_table[xy] );
1103 if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type==AV_PICTURE_TYPE_S) {
1106 s->mv[0][i][0] = s->current_picture.motion_val[0][ s->block_index[i] ][0];
1107 s->mv[0][i][1] = s->current_picture.motion_val[0][ s->block_index[i] ][1];
1109 s->mb_intra = IS_INTRA(mb_type);
1111 if (IS_SKIP(mb_type)) {
1114 s->block_last_index[i] = -1;
1115 s->mv_dir = MV_DIR_FORWARD;
1116 s->mv_type = MV_TYPE_16X16;
1117 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
1124 }else if(s->mb_intra){
1125 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1126 }else if(!s->mb_intra){
1127 // s->mcsel= 0; //FIXME do we need to init that
1129 s->mv_dir = MV_DIR_FORWARD;
1130 if (IS_8X8(mb_type)) {
1131 s->mv_type = MV_TYPE_8X8;
1133 s->mv_type = MV_TYPE_16X16;
1136 } else { /* I-Frame */
1138 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1141 if (!IS_SKIP(mb_type)) {
1143 s->dsp.clear_blocks(s->block[0]);
1144 /* decode each block */
1145 for (i = 0; i < 6; i++) {
1146 if(mpeg4_decode_block(s, block[i], i, cbp&32, s->mb_intra, s->rvlc) < 0){
1147 av_log(s->avctx, AV_LOG_ERROR, "texture corrupted at %d %d %d\n", s->mb_x, s->mb_y, s->mb_intra);
1154 /* per-MB end of slice check */
1156 if(--s->mb_num_left <= 0){
1157 if(mpeg4_is_resync(s))
1162 if(mpeg4_is_resync(s)){
1163 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1164 if(s->cbp_table[xy+delta])
1171 static int mpeg4_decode_mb(MpegEncContext *s,
1172 DCTELEM block[6][64])
1174 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1176 static int8_t quant_tab[4] = { -1, -2, 1, 2 };
1177 const int xy= s->mb_x + s->mb_y * s->mb_stride;
1179 assert(s->h263_pred);
1181 if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type==AV_PICTURE_TYPE_S) {
1183 if (get_bits1(&s->gb)) {
1187 s->block_last_index[i] = -1;
1188 s->mv_dir = MV_DIR_FORWARD;
1189 s->mv_type = MV_TYPE_16X16;
1190 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
1191 s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
1193 s->mv[0][0][0]= get_amv(s, 0);
1194 s->mv[0][0][1]= get_amv(s, 1);
1198 s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
1206 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1208 av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1213 s->dsp.clear_blocks(s->block[0]);
1215 s->mb_intra = ((cbpc & 4) != 0);
1216 if (s->mb_intra) goto intra;
1218 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
1219 s->mcsel= get_bits1(&s->gb);
1221 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1223 cbp = (cbpc & 3) | (cbpy << 2);
1225 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1227 if((!s->progressive_sequence) && (cbp || (s->workaround_bugs&FF_BUG_XVID_ILACE)))
1228 s->interlaced_dct= get_bits1(&s->gb);
1230 s->mv_dir = MV_DIR_FORWARD;
1231 if ((cbpc & 16) == 0) {
1233 s->current_picture.mb_type[xy]= MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
1234 /* 16x16 global motion prediction */
1235 s->mv_type = MV_TYPE_16X16;
1238 s->mv[0][0][0] = mx;
1239 s->mv[0][0][1] = my;
1240 }else if((!s->progressive_sequence) && get_bits1(&s->gb)){
1241 s->current_picture.mb_type[xy]= MB_TYPE_16x8 | MB_TYPE_L0 | MB_TYPE_INTERLACED;
1242 /* 16x8 field motion prediction */
1243 s->mv_type= MV_TYPE_FIELD;
1245 s->field_select[0][0]= get_bits1(&s->gb);
1246 s->field_select[0][1]= get_bits1(&s->gb);
1248 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1251 mx = h263_decode_motion(s, pred_x, s->f_code);
1255 my = h263_decode_motion(s, pred_y/2, s->f_code);
1259 s->mv[0][i][0] = mx;
1260 s->mv[0][i][1] = my;
1263 s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0;
1264 /* 16x16 motion prediction */
1265 s->mv_type = MV_TYPE_16X16;
1266 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1267 mx = h263_decode_motion(s, pred_x, s->f_code);
1272 my = h263_decode_motion(s, pred_y, s->f_code);
1276 s->mv[0][0][0] = mx;
1277 s->mv[0][0][1] = my;
1280 s->current_picture.mb_type[xy]= MB_TYPE_8x8 | MB_TYPE_L0;
1281 s->mv_type = MV_TYPE_8X8;
1283 mot_val = h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1284 mx = h263_decode_motion(s, pred_x, s->f_code);
1288 my = h263_decode_motion(s, pred_y, s->f_code);
1291 s->mv[0][i][0] = mx;
1292 s->mv[0][i][1] = my;
1297 } else if(s->pict_type==AV_PICTURE_TYPE_B) {
1298 int modb1; // first bit of modb
1299 int modb2; // second bit of modb
1302 s->mb_intra = 0; //B-frames never contain intra blocks
1303 s->mcsel=0; // ... true gmc blocks
1307 s->last_mv[i][0][0]=
1308 s->last_mv[i][0][1]=
1309 s->last_mv[i][1][0]=
1310 s->last_mv[i][1][1]= 0;
1313 ff_thread_await_progress((AVFrame*)s->next_picture_ptr, s->mb_y, 0);
1316 /* if we skipped it in the future P Frame than skip it now too */
1317 s->mb_skipped= s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1322 s->block_last_index[i] = -1;
1324 s->mv_dir = MV_DIR_FORWARD;
1325 s->mv_type = MV_TYPE_16X16;
1330 s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
1334 modb1= get_bits1(&s->gb);
1336 mb_type= MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1; //like MB_TYPE_B_DIRECT but no vectors coded
1339 modb2= get_bits1(&s->gb);
1340 mb_type= get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1342 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1345 mb_type= mb_type_b_map[ mb_type ];
1348 s->dsp.clear_blocks(s->block[0]);
1349 cbp= get_bits(&s->gb, 6);
1352 if ((!IS_DIRECT(mb_type)) && cbp) {
1353 if(get_bits1(&s->gb)){
1354 ff_set_qscale(s, s->qscale + get_bits1(&s->gb)*4 - 2);
1358 if(!s->progressive_sequence){
1360 s->interlaced_dct= get_bits1(&s->gb);
1362 if(!IS_DIRECT(mb_type) && get_bits1(&s->gb)){
1363 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1364 mb_type &= ~MB_TYPE_16x16;
1366 if(USES_LIST(mb_type, 0)){
1367 s->field_select[0][0]= get_bits1(&s->gb);
1368 s->field_select[0][1]= get_bits1(&s->gb);
1370 if(USES_LIST(mb_type, 1)){
1371 s->field_select[1][0]= get_bits1(&s->gb);
1372 s->field_select[1][1]= get_bits1(&s->gb);
1378 if((mb_type & (MB_TYPE_DIRECT2|MB_TYPE_INTERLACED)) == 0){
1379 s->mv_type= MV_TYPE_16X16;
1381 if(USES_LIST(mb_type, 0)){
1382 s->mv_dir = MV_DIR_FORWARD;
1384 mx = h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1385 my = h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1386 s->last_mv[0][1][0]= s->last_mv[0][0][0]= s->mv[0][0][0] = mx;
1387 s->last_mv[0][1][1]= s->last_mv[0][0][1]= s->mv[0][0][1] = my;
1390 if(USES_LIST(mb_type, 1)){
1391 s->mv_dir |= MV_DIR_BACKWARD;
1393 mx = h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1394 my = h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1395 s->last_mv[1][1][0]= s->last_mv[1][0][0]= s->mv[1][0][0] = mx;
1396 s->last_mv[1][1][1]= s->last_mv[1][0][1]= s->mv[1][0][1] = my;
1398 }else if(!IS_DIRECT(mb_type)){
1399 s->mv_type= MV_TYPE_FIELD;
1401 if(USES_LIST(mb_type, 0)){
1402 s->mv_dir = MV_DIR_FORWARD;
1405 mx = h263_decode_motion(s, s->last_mv[0][i][0] , s->f_code);
1406 my = h263_decode_motion(s, s->last_mv[0][i][1]/2, s->f_code);
1407 s->last_mv[0][i][0]= s->mv[0][i][0] = mx;
1408 s->last_mv[0][i][1]= (s->mv[0][i][1] = my)*2;
1412 if(USES_LIST(mb_type, 1)){
1413 s->mv_dir |= MV_DIR_BACKWARD;
1416 mx = h263_decode_motion(s, s->last_mv[1][i][0] , s->b_code);
1417 my = h263_decode_motion(s, s->last_mv[1][i][1]/2, s->b_code);
1418 s->last_mv[1][i][0]= s->mv[1][i][0] = mx;
1419 s->last_mv[1][i][1]= (s->mv[1][i][1] = my)*2;
1425 if(IS_DIRECT(mb_type)){
1426 if(IS_SKIP(mb_type))
1429 mx = h263_decode_motion(s, 0, 1);
1430 my = h263_decode_motion(s, 0, 1);
1433 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1434 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1436 s->current_picture.mb_type[xy]= mb_type;
1437 } else { /* I-Frame */
1439 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1441 av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1449 s->ac_pred = get_bits1(&s->gb);
1451 s->current_picture.mb_type[xy]= MB_TYPE_INTRA | MB_TYPE_ACPRED;
1453 s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
1455 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1457 av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1460 cbp = (cbpc & 3) | (cbpy << 2);
1462 s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
1465 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1468 if(!s->progressive_sequence)
1469 s->interlaced_dct= get_bits1(&s->gb);
1471 s->dsp.clear_blocks(s->block[0]);
1472 /* decode each block */
1473 for (i = 0; i < 6; i++) {
1474 if (mpeg4_decode_block(s, block[i], i, cbp&32, 1, 0) < 0)
1481 /* decode each block */
1482 for (i = 0; i < 6; i++) {
1483 if (mpeg4_decode_block(s, block[i], i, cbp&32, 0, 0) < 0)
1489 /* per-MB end of slice check */
1490 if(s->codec_id==CODEC_ID_MPEG4){
1491 if(mpeg4_is_resync(s)){
1492 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1494 if(s->pict_type==AV_PICTURE_TYPE_B){
1495 ff_thread_await_progress((AVFrame*)s->next_picture_ptr,
1496 (s->mb_x + delta >= s->mb_width) ? FFMIN(s->mb_y+1, s->mb_height-1) : s->mb_y, 0);
1499 if(s->pict_type==AV_PICTURE_TYPE_B && s->next_picture.mbskip_table[xy + delta])
1509 static int mpeg4_decode_gop_header(MpegEncContext * s, GetBitContext *gb){
1510 int hours, minutes, seconds;
1512 if(!show_bits(gb, 23)){
1513 av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1517 hours= get_bits(gb, 5);
1518 minutes= get_bits(gb, 6);
1520 seconds= get_bits(gb, 6);
1522 s->time_base= seconds + 60*(minutes + 60*hours);
1530 static int decode_vol_header(MpegEncContext *s, GetBitContext *gb){
1531 int width, height, vo_ver_id;
1534 skip_bits(gb, 1); /* random access */
1535 s->vo_type= get_bits(gb, 8);
1536 if (get_bits1(gb) != 0) { /* is_ol_id */
1537 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1538 skip_bits(gb, 3); /* vo_priority */
1542 s->aspect_ratio_info= get_bits(gb, 4);
1543 if(s->aspect_ratio_info == FF_ASPECT_EXTENDED){
1544 s->avctx->sample_aspect_ratio.num= get_bits(gb, 8); // par_width
1545 s->avctx->sample_aspect_ratio.den= get_bits(gb, 8); // par_height
1547 s->avctx->sample_aspect_ratio= ff_h263_pixel_aspect[s->aspect_ratio_info];
1550 if ((s->vol_control_parameters=get_bits1(gb))) { /* vol control parameter */
1551 int chroma_format= get_bits(gb, 2);
1552 if(chroma_format!=CHROMA_420){
1553 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1555 s->low_delay= get_bits1(gb);
1556 if(get_bits1(gb)){ /* vbv parameters */
1557 get_bits(gb, 15); /* first_half_bitrate */
1558 skip_bits1(gb); /* marker */
1559 get_bits(gb, 15); /* latter_half_bitrate */
1560 skip_bits1(gb); /* marker */
1561 get_bits(gb, 15); /* first_half_vbv_buffer_size */
1562 skip_bits1(gb); /* marker */
1563 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1564 get_bits(gb, 11); /* first_half_vbv_occupancy */
1565 skip_bits1(gb); /* marker */
1566 get_bits(gb, 15); /* latter_half_vbv_occupancy */
1567 skip_bits1(gb); /* marker */
1570 // set low delay flag only once the smartest? low delay detection won't be overriden
1571 if(s->picture_number==0)
1575 s->shape = get_bits(gb, 2); /* vol shape */
1576 if(s->shape != RECT_SHAPE) av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1577 if(s->shape == GRAY_SHAPE && vo_ver_id != 1){
1578 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1579 skip_bits(gb, 4); //video_object_layer_shape_extension
1582 check_marker(gb, "before time_increment_resolution");
1584 s->avctx->time_base.den = get_bits(gb, 16);
1585 if(!s->avctx->time_base.den){
1586 av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n");
1587 s->avctx->time_base.num = 0;
1591 s->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
1592 if (s->time_increment_bits < 1)
1593 s->time_increment_bits = 1;
1595 check_marker(gb, "before fixed_vop_rate");
1597 if (get_bits1(gb) != 0) { /* fixed_vop_rate */
1598 s->avctx->time_base.num = get_bits(gb, s->time_increment_bits);
1600 s->avctx->time_base.num = 1;
1604 if (s->shape != BIN_ONLY_SHAPE) {
1605 if (s->shape == RECT_SHAPE) {
1606 skip_bits1(gb); /* marker */
1607 width = get_bits(gb, 13);
1608 skip_bits1(gb); /* marker */
1609 height = get_bits(gb, 13);
1610 skip_bits1(gb); /* marker */
1611 if(width && height && !(s->width && s->codec_tag == AV_RL32("MP4S"))){ /* they should be non zero but who knows ... */
1617 s->progressive_sequence=
1618 s->progressive_frame= get_bits1(gb)^1;
1619 s->interlaced_dct=0;
1620 if(!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1621 av_log(s->avctx, AV_LOG_INFO, "MPEG4 OBMC not supported (very likely buggy encoder)\n"); /* OBMC Disable */
1622 if (vo_ver_id == 1) {
1623 s->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1625 s->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1627 if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1628 if(s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE){
1629 if(s->vol_sprite_usage==STATIC_SPRITE){
1630 s->sprite_width = get_bits(gb, 13);
1631 skip_bits1(gb); /* marker */
1632 s->sprite_height= get_bits(gb, 13);
1633 skip_bits1(gb); /* marker */
1634 s->sprite_left = get_bits(gb, 13);
1635 skip_bits1(gb); /* marker */
1636 s->sprite_top = get_bits(gb, 13);
1637 skip_bits1(gb); /* marker */
1639 s->num_sprite_warping_points= get_bits(gb, 6);
1640 if(s->num_sprite_warping_points > 3){
1641 av_log(s->avctx, AV_LOG_ERROR, "%d sprite_warping_points\n", s->num_sprite_warping_points);
1642 s->num_sprite_warping_points= 0;
1645 s->sprite_warping_accuracy = get_bits(gb, 2);
1646 s->sprite_brightness_change= get_bits1(gb);
1647 if(s->vol_sprite_usage==STATIC_SPRITE)
1648 s->low_latency_sprite= get_bits1(gb);
1650 // FIXME sadct disable bit if verid!=1 && shape not rect
1652 if (get_bits1(gb) == 1) { /* not_8_bit */
1653 s->quant_precision = get_bits(gb, 4); /* quant_precision */
1654 if(get_bits(gb, 4)!=8) av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n"); /* bits_per_pixel */
1655 if(s->quant_precision!=5) av_log(s->avctx, AV_LOG_ERROR, "quant precision %d\n", s->quant_precision);
1657 s->quant_precision = 5;
1660 // FIXME a bunch of grayscale shape things
1662 if((s->mpeg_quant=get_bits1(gb))){ /* vol_quant_type */
1665 /* load default matrixes */
1666 for(i=0; i<64; i++){
1667 int j= s->dsp.idct_permutation[i];
1668 v= ff_mpeg4_default_intra_matrix[i];
1669 s->intra_matrix[j]= v;
1670 s->chroma_intra_matrix[j]= v;
1672 v= ff_mpeg4_default_non_intra_matrix[i];
1673 s->inter_matrix[j]= v;
1674 s->chroma_inter_matrix[j]= v;
1677 /* load custom intra matrix */
1680 for(i=0; i<64; i++){
1686 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1687 s->intra_matrix[j]= v;
1688 s->chroma_intra_matrix[j]= v;
1691 /* replicate last value */
1693 int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1694 s->intra_matrix[j]= last;
1695 s->chroma_intra_matrix[j]= last;
1699 /* load custom non intra matrix */
1702 for(i=0; i<64; i++){
1708 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1709 s->inter_matrix[j]= v;
1710 s->chroma_inter_matrix[j]= v;
1713 /* replicate last value */
1715 int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1716 s->inter_matrix[j]= last;
1717 s->chroma_inter_matrix[j]= last;
1721 // FIXME a bunch of grayscale shape things
1725 s->quarter_sample= get_bits1(gb);
1726 else s->quarter_sample=0;
1729 int pos= get_bits_count(gb);
1730 int estimation_method= get_bits(gb, 2);
1731 if(estimation_method<2){
1733 s->cplx_estimation_trash_i += 8*get_bits1(gb); //opaque
1734 s->cplx_estimation_trash_i += 8*get_bits1(gb); //transparent
1735 s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_cae
1736 s->cplx_estimation_trash_i += 8*get_bits1(gb); //inter_cae
1737 s->cplx_estimation_trash_i += 8*get_bits1(gb); //no_update
1738 s->cplx_estimation_trash_i += 8*get_bits1(gb); //upampling
1741 s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_blocks
1742 s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter_blocks
1743 s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter4v_blocks
1744 s->cplx_estimation_trash_i += 8*get_bits1(gb); //not coded blocks
1746 if(!check_marker(gb, "in complexity estimation part 1")){
1747 skip_bits_long(gb, pos - get_bits_count(gb));
1751 s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_coeffs
1752 s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_lines
1753 s->cplx_estimation_trash_i += 8*get_bits1(gb); //vlc_syms
1754 s->cplx_estimation_trash_i += 4*get_bits1(gb); //vlc_bits
1757 s->cplx_estimation_trash_p += 8*get_bits1(gb); //apm
1758 s->cplx_estimation_trash_p += 8*get_bits1(gb); //npm
1759 s->cplx_estimation_trash_b += 8*get_bits1(gb); //interpolate_mc_q
1760 s->cplx_estimation_trash_p += 8*get_bits1(gb); //forwback_mc_q
1761 s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel2
1762 s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel4
1764 if(!check_marker(gb, "in complexity estimation part 2")){
1765 skip_bits_long(gb, pos - get_bits_count(gb));
1768 if(estimation_method==1){
1769 s->cplx_estimation_trash_i += 8*get_bits1(gb); //sadct
1770 s->cplx_estimation_trash_p += 8*get_bits1(gb); //qpel
1773 av_log(s->avctx, AV_LOG_ERROR, "Invalid Complexity estimation method %d\n", estimation_method);
1776 s->cplx_estimation_trash_i=
1777 s->cplx_estimation_trash_p=
1778 s->cplx_estimation_trash_b= 0;
1781 s->resync_marker= !get_bits1(gb); /* resync_marker_disabled */
1783 s->data_partitioning= get_bits1(gb);
1784 if(s->data_partitioning){
1785 s->rvlc= get_bits1(gb);
1788 if(vo_ver_id != 1) {
1789 s->new_pred= get_bits1(gb);
1791 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
1792 skip_bits(gb, 2); /* requested upstream message type */
1793 skip_bits1(gb); /* newpred segment type */
1795 s->reduced_res_vop= get_bits1(gb);
1796 if(s->reduced_res_vop) av_log(s->avctx, AV_LOG_ERROR, "reduced resolution VOP not supported\n");
1800 s->reduced_res_vop= 0;
1803 s->scalability= get_bits1(gb);
1805 if (s->scalability) {
1806 GetBitContext bak= *gb;
1807 int h_sampling_factor_n;
1808 int h_sampling_factor_m;
1809 int v_sampling_factor_n;
1810 int v_sampling_factor_m;
1812 s->hierachy_type= get_bits1(gb);
1813 skip_bits(gb, 4); /* ref_layer_id */
1814 skip_bits1(gb); /* ref_layer_sampling_dir */
1815 h_sampling_factor_n= get_bits(gb, 5);
1816 h_sampling_factor_m= get_bits(gb, 5);
1817 v_sampling_factor_n= get_bits(gb, 5);
1818 v_sampling_factor_m= get_bits(gb, 5);
1819 s->enhancement_type= get_bits1(gb);
1821 if( h_sampling_factor_n==0 || h_sampling_factor_m==0
1822 || v_sampling_factor_n==0 || v_sampling_factor_m==0){
1823 /* illegal scalability header (VERY broken encoder),
1824 * trying to workaround */
1828 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
1830 // bin shape stuff FIXME
1837 * decodes the user data stuff in the header.
1838 * Also initializes divx/xvid/lavc_version/build.
1840 static int decode_user_data(MpegEncContext *s, GetBitContext *gb){
1844 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
1847 for(i=0; i<255 && get_bits_count(gb) < gb->size_in_bits; i++){
1848 if(show_bits(gb, 23) == 0) break;
1849 buf[i]= get_bits(gb, 8);
1853 /* divx detection */
1854 e=sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
1856 e=sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
1858 s->divx_version= ver;
1859 s->divx_build= build;
1860 s->divx_packed= e==3 && last=='p';
1861 if(s->divx_packed && !s->showed_packed_warning) {
1862 av_log(s->avctx, AV_LOG_WARNING, "Invalid and inefficient vfw-avi packed B frames detected\n");
1863 s->showed_packed_warning=1;
1867 /* ffmpeg detection */
1868 e=sscanf(buf, "FFmpe%*[^b]b%d", &build)+3;
1870 e=sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
1872 e=sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3)+1;
1874 build= (ver<<16) + (ver2<<8) + ver3;
1877 if(strcmp(buf, "ffmpeg")==0){
1878 s->lavc_build= 4600;
1882 s->lavc_build= build;
1885 /* Xvid detection */
1886 e=sscanf(buf, "XviD%d", &build);
1888 s->xvid_build= build;
1894 static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
1895 int time_incr, time_increment;
1897 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
1898 if(s->pict_type==AV_PICTURE_TYPE_B && s->low_delay && s->vol_control_parameters==0 && !(s->flags & CODEC_FLAG_LOW_DELAY)){
1899 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n");
1903 s->partitioned_frame= s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_B;
1904 if(s->partitioned_frame)
1905 s->decode_mb= mpeg4_decode_partitioned_mb;
1907 s->decode_mb= mpeg4_decode_mb;
1910 while (get_bits1(gb) != 0)
1913 check_marker(gb, "before time_increment");
1915 if(s->time_increment_bits==0 || !(show_bits(gb, s->time_increment_bits+1)&1)){
1916 av_log(s->avctx, AV_LOG_ERROR, "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
1918 for(s->time_increment_bits=1 ;s->time_increment_bits<16; s->time_increment_bits++){
1919 if ( s->pict_type == AV_PICTURE_TYPE_P
1920 || (s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE)) {
1921 if((show_bits(gb, s->time_increment_bits+6)&0x37) == 0x30) break;
1923 if((show_bits(gb, s->time_increment_bits+5)&0x1F) == 0x18) break;
1926 av_log(s->avctx, AV_LOG_ERROR, "my guess is %d bits ;)\n",s->time_increment_bits);
1929 if(IS_3IV1) time_increment= get_bits1(gb); //FIXME investigate further
1930 else time_increment= get_bits(gb, s->time_increment_bits);
1932 if(s->pict_type!=AV_PICTURE_TYPE_B){
1933 s->last_time_base= s->time_base;
1934 s->time_base+= time_incr;
1935 s->time= s->time_base*s->avctx->time_base.den + time_increment;
1936 if(s->workaround_bugs&FF_BUG_UMP4){
1937 if(s->time < s->last_non_b_time){
1938 /* header is not mpeg-4-compatible, broken encoder,
1939 * trying to workaround */
1941 s->time+= s->avctx->time_base.den;
1944 s->pp_time= s->time - s->last_non_b_time;
1945 s->last_non_b_time= s->time;
1947 s->time= (s->last_time_base + time_incr)*s->avctx->time_base.den + time_increment;
1948 s->pb_time= s->pp_time - (s->last_non_b_time - s->time);
1949 if(s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0){
1950 /* messed up order, maybe after seeking? skipping current b-frame */
1951 return FRAME_SKIPPED;
1953 ff_mpeg4_init_direct_mv(s);
1955 if(s->t_frame==0) s->t_frame= s->pb_time;
1956 if(s->t_frame==0) s->t_frame=1; // 1/0 protection
1957 s->pp_field_time= ( ROUNDED_DIV(s->last_non_b_time, s->t_frame)
1958 - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
1959 s->pb_field_time= ( ROUNDED_DIV(s->time, s->t_frame)
1960 - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
1961 if(!s->progressive_sequence){
1962 if(s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1)
1963 return FRAME_SKIPPED;
1967 if(s->avctx->time_base.num)
1968 s->current_picture_ptr->pts= (s->time + s->avctx->time_base.num/2) / s->avctx->time_base.num;
1970 s->current_picture_ptr->pts= AV_NOPTS_VALUE;
1971 if(s->avctx->debug&FF_DEBUG_PTS)
1972 av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n", s->current_picture_ptr->pts);
1974 check_marker(gb, "before vop_coded");
1977 if (get_bits1(gb) != 1){
1978 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
1979 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
1980 return FRAME_SKIPPED;
1982 if (s->shape != BIN_ONLY_SHAPE && ( s->pict_type == AV_PICTURE_TYPE_P
1983 || (s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE))) {
1984 /* rounding type for motion estimation */
1985 s->no_rounding = get_bits1(gb);
1989 //FIXME reduced res stuff
1991 if (s->shape != RECT_SHAPE) {
1992 if (s->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
1993 skip_bits(gb, 13); /* width */
1994 skip_bits1(gb); /* marker */
1995 skip_bits(gb, 13); /* height */
1996 skip_bits1(gb); /* marker */
1997 skip_bits(gb, 13); /* hor_spat_ref */
1998 skip_bits1(gb); /* marker */
1999 skip_bits(gb, 13); /* ver_spat_ref */
2001 skip_bits1(gb); /* change_CR_disable */
2003 if (get_bits1(gb) != 0) {
2004 skip_bits(gb, 8); /* constant_alpha_value */
2007 //FIXME complexity estimation stuff
2009 if (s->shape != BIN_ONLY_SHAPE) {
2010 skip_bits_long(gb, s->cplx_estimation_trash_i);
2011 if(s->pict_type != AV_PICTURE_TYPE_I)
2012 skip_bits_long(gb, s->cplx_estimation_trash_p);
2013 if(s->pict_type == AV_PICTURE_TYPE_B)
2014 skip_bits_long(gb, s->cplx_estimation_trash_b);
2016 s->intra_dc_threshold= mpeg4_dc_threshold[ get_bits(gb, 3) ];
2017 if(!s->progressive_sequence){
2018 s->top_field_first= get_bits1(gb);
2019 s->alternate_scan= get_bits1(gb);
2021 s->alternate_scan= 0;
2024 if(s->alternate_scan){
2025 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
2026 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
2027 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2028 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2030 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
2031 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
2032 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2033 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2036 if(s->pict_type == AV_PICTURE_TYPE_S && (s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE)){
2037 mpeg4_decode_sprite_trajectory(s, gb);
2038 if(s->sprite_brightness_change) av_log(s->avctx, AV_LOG_ERROR, "sprite_brightness_change not supported\n");
2039 if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2042 if (s->shape != BIN_ONLY_SHAPE) {
2043 s->chroma_qscale= s->qscale = get_bits(gb, s->quant_precision);
2045 av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (qscale=0)\n");
2046 return -1; // makes no sense to continue, as there is nothing left from the image then
2049 if (s->pict_type != AV_PICTURE_TYPE_I) {
2050 s->f_code = get_bits(gb, 3); /* fcode_for */
2052 av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (f_code=0)\n");
2053 return -1; // makes no sense to continue, as the MV decoding will break very quickly
2058 if (s->pict_type == AV_PICTURE_TYPE_B) {
2059 s->b_code = get_bits(gb, 3);
2063 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2064 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",
2065 s->qscale, s->f_code, s->b_code,
2066 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")),
2067 gb->size_in_bits,s->progressive_sequence, s->alternate_scan, s->top_field_first,
2068 s->quarter_sample ? "q" : "h", s->data_partitioning, s->resync_marker, s->num_sprite_warping_points,
2069 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);
2072 if(!s->scalability){
2073 if (s->shape!=RECT_SHAPE && s->pict_type!=AV_PICTURE_TYPE_I) {
2074 skip_bits1(gb); // vop shape coding type
2077 if(s->enhancement_type){
2078 int load_backward_shape= get_bits1(gb);
2079 if(load_backward_shape){
2080 av_log(s->avctx, AV_LOG_ERROR, "load backward shape isn't supported\n");
2083 skip_bits(gb, 2); //ref_select_code
2086 /* detect buggy encoders which don't set the low_delay flag (divx4/xvid/opendivx)*/
2087 // note we cannot detect divx5 without b-frames easily (although it's buggy too)
2088 if(s->vo_type==0 && s->vol_control_parameters==0 && s->divx_version==-1 && s->picture_number==0){
2089 av_log(s->avctx, AV_LOG_WARNING, "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2093 s->picture_number++; // better than pic number==0 always ;)
2095 s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table; //FIXME add short header support
2096 s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
2098 if(s->workaround_bugs&FF_BUG_EDGE){
2099 s->h_edge_pos= s->width;
2100 s->v_edge_pos= s->height;
2106 * decode mpeg4 headers
2107 * @return <0 if no VOP found (or a damaged one)
2108 * FRAME_SKIPPED if a not coded VOP is found
2109 * 0 if a VOP is found
2111 int ff_mpeg4_decode_picture_header(MpegEncContext * s, GetBitContext *gb)
2115 /* search next start code */
2118 if(s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630){
2120 if(get_bits(gb, 8) == 0xF0)
2126 if(get_bits_count(gb) >= gb->size_in_bits){
2127 if(gb->size_in_bits==8 && (s->divx_version>=0 || s->xvid_build>=0)){
2128 av_log(s->avctx, AV_LOG_WARNING, "frame skip %d\n", gb->size_in_bits);
2129 return FRAME_SKIPPED; //divx bug
2131 return -1; //end of stream
2134 /* use the bits after the test */
2135 v = get_bits(gb, 8);
2136 startcode = ((startcode << 8) | v) & 0xffffffff;
2138 if((startcode&0xFFFFFF00) != 0x100)
2139 continue; //no startcode
2141 if(s->avctx->debug&FF_DEBUG_STARTCODE){
2142 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2143 if (startcode<=0x11F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2144 else if(startcode<=0x12F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2145 else if(startcode<=0x13F) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2146 else if(startcode<=0x15F) av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2147 else if(startcode<=0x1AF) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2148 else if(startcode==0x1B0) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2149 else if(startcode==0x1B1) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2150 else if(startcode==0x1B2) av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2151 else if(startcode==0x1B3) av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2152 else if(startcode==0x1B4) av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2153 else if(startcode==0x1B5) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2154 else if(startcode==0x1B6) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2155 else if(startcode==0x1B7) av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2156 else if(startcode==0x1B8) av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2157 else if(startcode==0x1B9) av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2158 else if(startcode==0x1BA) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2159 else if(startcode==0x1BB) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2160 else if(startcode==0x1BC) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2161 else if(startcode==0x1BD) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2162 else if(startcode==0x1BE) av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2163 else if(startcode==0x1BF) av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2164 else if(startcode==0x1C0) av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2165 else if(startcode==0x1C1) av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2166 else if(startcode==0x1C2) av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2167 else if(startcode==0x1C3) av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2168 else if(startcode<=0x1C5) av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2169 else if(startcode<=0x1FF) av_log(s->avctx, AV_LOG_DEBUG, "System start");
2170 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2173 if(startcode >= 0x120 && startcode <= 0x12F){
2174 if(decode_vol_header(s, gb) < 0)
2177 else if(startcode == USER_DATA_STARTCODE){
2178 decode_user_data(s, gb);
2180 else if(startcode == GOP_STARTCODE){
2181 mpeg4_decode_gop_header(s, gb);
2183 else if(startcode == VOP_STARTCODE){
2191 if(s->flags& CODEC_FLAG_LOW_DELAY)
2193 s->avctx->has_b_frames= !s->low_delay;
2194 return decode_vop_header(s, gb);
2197 static av_cold int decode_init(AVCodecContext *avctx)
2199 MpegEncContext *s = avctx->priv_data;
2201 static int done = 0;
2208 if((ret=ff_h263_decode_init(avctx)) < 0)
2214 init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
2215 init_rl(&rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
2216 init_rl(&rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
2217 INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
2218 INIT_VLC_RL(rvlc_rl_inter, 1072);
2219 INIT_VLC_RL(rvlc_rl_intra, 1072);
2220 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2221 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2222 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2223 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2224 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2225 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2226 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2227 &sprite_trajectory_tab[0][1], 4, 2,
2228 &sprite_trajectory_tab[0][0], 4, 2, 128);
2229 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2230 &mb_type_b_tab[0][1], 2, 1,
2231 &mb_type_b_tab[0][0], 2, 1, 16);
2235 s->low_delay = 0; //default, might be overriden in the vol header during header parsing
2236 s->decode_mb= mpeg4_decode_mb;
2237 s->time_increment_bits = 4; /* default value for broken headers */
2238 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
2243 AVCodec ff_mpeg4_decoder = {
2247 sizeof(MpegEncContext),
2251 ff_h263_decode_frame,
2252 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_FRAME_THREADS,
2253 .flush= ff_mpeg_flush,
2255 .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2256 .pix_fmts= ff_hwaccel_pixfmt_list_420,
2257 .update_thread_context= ONLY_IF_THREADS_ENABLED(ff_mpeg_update_thread_context)
2261 #if CONFIG_MPEG4_VDPAU_DECODER
2262 AVCodec ff_mpeg4_vdpau_decoder = {
2266 sizeof(MpegEncContext),
2270 ff_h263_decode_frame,
2271 CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_HWACCEL_VDPAU,
2272 .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2273 .pix_fmts= (const enum PixelFormat[]){PIX_FMT_VDPAU_MPEG4, PIX_FMT_NONE},