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.f.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 int mb_num_bits= av_log2(s->mb_num - 1) + 1;
138 GetBitContext gb= s->gb;
140 skip_bits(&s->gb, 1);
141 align_get_bits(&s->gb);
143 for(len=0; len<32; len++){
144 if(get_bits1(&s->gb)) break;
147 mb_num= get_bits(&s->gb, mb_num_bits);
148 if(!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
153 if(len>=ff_mpeg4_get_video_packet_prefix_length(s))
160 static void mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb)
163 int a= 2<<s->sprite_warping_accuracy;
164 int rho= 3-s->sprite_warping_accuracy;
166 const int vop_ref[4][2]= {{0,0}, {s->width,0}, {0, s->height}, {s->width, s->height}}; // only true for rectangle shapes
167 int d[4][2]={{0,0}, {0,0}, {0,0}, {0,0}};
168 int sprite_ref[4][2];
169 int virtual_ref[2][2];
176 for(i=0; i<s->num_sprite_warping_points; i++){
180 length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
182 x= get_xbits(gb, length);
184 if(!(s->divx_version==500 && s->divx_build==413)) skip_bits1(gb); /* marker bit */
186 length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
188 y=get_xbits(gb, length);
190 skip_bits1(gb); /* marker bit */
191 s->sprite_traj[i][0]= d[i][0]= x;
192 s->sprite_traj[i][1]= d[i][1]= y;
195 s->sprite_traj[i][0]= s->sprite_traj[i][1]= 0;
197 while((1<<alpha)<w) alpha++;
198 while((1<<beta )<h) beta++; // there seems to be a typo in the mpeg4 std for the definition of w' and h'
202 // Note, the 4th point isn't used for GMC
203 if(s->divx_version==500 && s->divx_build==413){
204 sprite_ref[0][0]= a*vop_ref[0][0] + d[0][0];
205 sprite_ref[0][1]= a*vop_ref[0][1] + d[0][1];
206 sprite_ref[1][0]= a*vop_ref[1][0] + d[0][0] + d[1][0];
207 sprite_ref[1][1]= a*vop_ref[1][1] + d[0][1] + d[1][1];
208 sprite_ref[2][0]= a*vop_ref[2][0] + d[0][0] + d[2][0];
209 sprite_ref[2][1]= a*vop_ref[2][1] + d[0][1] + d[2][1];
211 sprite_ref[0][0]= (a>>1)*(2*vop_ref[0][0] + d[0][0]);
212 sprite_ref[0][1]= (a>>1)*(2*vop_ref[0][1] + d[0][1]);
213 sprite_ref[1][0]= (a>>1)*(2*vop_ref[1][0] + d[0][0] + d[1][0]);
214 sprite_ref[1][1]= (a>>1)*(2*vop_ref[1][1] + d[0][1] + d[1][1]);
215 sprite_ref[2][0]= (a>>1)*(2*vop_ref[2][0] + d[0][0] + d[2][0]);
216 sprite_ref[2][1]= (a>>1)*(2*vop_ref[2][1] + d[0][1] + d[2][1]);
218 /* sprite_ref[3][0]= (a>>1)*(2*vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
219 sprite_ref[3][1]= (a>>1)*(2*vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
221 // this is mostly identical to the mpeg4 std (and is totally unreadable because of that ...)
222 // perhaps it should be reordered to be more readable ...
223 // the idea behind this virtual_ref mess is to be able to use shifts later per pixel instead of divides
224 // so the distance between points is converted from w&h based to w2&h2 based which are of the 2^x form
225 virtual_ref[0][0]= 16*(vop_ref[0][0] + w2)
226 + 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);
227 virtual_ref[0][1]= 16*vop_ref[0][1]
228 + 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);
229 virtual_ref[1][0]= 16*vop_ref[0][0]
230 + 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);
231 virtual_ref[1][1]= 16*(vop_ref[0][1] + h2)
232 + 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);
234 switch(s->num_sprite_warping_points)
237 s->sprite_offset[0][0]= 0;
238 s->sprite_offset[0][1]= 0;
239 s->sprite_offset[1][0]= 0;
240 s->sprite_offset[1][1]= 0;
241 s->sprite_delta[0][0]= a;
242 s->sprite_delta[0][1]= 0;
243 s->sprite_delta[1][0]= 0;
244 s->sprite_delta[1][1]= a;
245 s->sprite_shift[0]= 0;
246 s->sprite_shift[1]= 0;
249 s->sprite_offset[0][0]= sprite_ref[0][0] - a*vop_ref[0][0];
250 s->sprite_offset[0][1]= sprite_ref[0][1] - a*vop_ref[0][1];
251 s->sprite_offset[1][0]= ((sprite_ref[0][0]>>1)|(sprite_ref[0][0]&1)) - a*(vop_ref[0][0]/2);
252 s->sprite_offset[1][1]= ((sprite_ref[0][1]>>1)|(sprite_ref[0][1]&1)) - a*(vop_ref[0][1]/2);
253 s->sprite_delta[0][0]= a;
254 s->sprite_delta[0][1]= 0;
255 s->sprite_delta[1][0]= 0;
256 s->sprite_delta[1][1]= a;
257 s->sprite_shift[0]= 0;
258 s->sprite_shift[1]= 0;
261 s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+rho))
262 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][0])
263 + ( r*sprite_ref[0][1] - virtual_ref[0][1])*(-vop_ref[0][1])
264 + (1<<(alpha+rho-1));
265 s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+rho))
266 + (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-vop_ref[0][0])
267 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][1])
268 + (1<<(alpha+rho-1));
269 s->sprite_offset[1][0]= ( (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][0] + 1)
270 +( r*sprite_ref[0][1] - virtual_ref[0][1])*(-2*vop_ref[0][1] + 1)
271 +2*w2*r*sprite_ref[0][0]
273 + (1<<(alpha+rho+1)));
274 s->sprite_offset[1][1]= ( (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-2*vop_ref[0][0] + 1)
275 +(-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][1] + 1)
276 +2*w2*r*sprite_ref[0][1]
278 + (1<<(alpha+rho+1)));
279 s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
280 s->sprite_delta[0][1]= (+r*sprite_ref[0][1] - virtual_ref[0][1]);
281 s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1]);
282 s->sprite_delta[1][1]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
284 s->sprite_shift[0]= alpha+rho;
285 s->sprite_shift[1]= alpha+rho+2;
288 min_ab= FFMIN(alpha, beta);
291 s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+beta+rho-min_ab))
292 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-vop_ref[0][0])
293 + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-vop_ref[0][1])
294 + (1<<(alpha+beta+rho-min_ab-1));
295 s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+beta+rho-min_ab))
296 + (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-vop_ref[0][0])
297 + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-vop_ref[0][1])
298 + (1<<(alpha+beta+rho-min_ab-1));
299 s->sprite_offset[1][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-2*vop_ref[0][0] + 1)
300 + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-2*vop_ref[0][1] + 1)
301 + 2*w2*h3*r*sprite_ref[0][0]
303 + (1<<(alpha+beta+rho-min_ab+1));
304 s->sprite_offset[1][1]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-2*vop_ref[0][0] + 1)
305 + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-2*vop_ref[0][1] + 1)
306 + 2*w2*h3*r*sprite_ref[0][1]
308 + (1<<(alpha+beta+rho-min_ab+1));
309 s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3;
310 s->sprite_delta[0][1]= (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3;
311 s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3;
312 s->sprite_delta[1][1]= (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3;
314 s->sprite_shift[0]= alpha + beta + rho - min_ab;
315 s->sprite_shift[1]= alpha + beta + rho - min_ab + 2;
318 /* try to simplify the situation */
319 if( s->sprite_delta[0][0] == a<<s->sprite_shift[0]
320 && s->sprite_delta[0][1] == 0
321 && s->sprite_delta[1][0] == 0
322 && s->sprite_delta[1][1] == a<<s->sprite_shift[0])
324 s->sprite_offset[0][0]>>=s->sprite_shift[0];
325 s->sprite_offset[0][1]>>=s->sprite_shift[0];
326 s->sprite_offset[1][0]>>=s->sprite_shift[1];
327 s->sprite_offset[1][1]>>=s->sprite_shift[1];
328 s->sprite_delta[0][0]= a;
329 s->sprite_delta[0][1]= 0;
330 s->sprite_delta[1][0]= 0;
331 s->sprite_delta[1][1]= a;
332 s->sprite_shift[0]= 0;
333 s->sprite_shift[1]= 0;
334 s->real_sprite_warping_points=1;
337 int shift_y= 16 - s->sprite_shift[0];
338 int shift_c= 16 - s->sprite_shift[1];
340 s->sprite_offset[0][i]<<= shift_y;
341 s->sprite_offset[1][i]<<= shift_c;
342 s->sprite_delta[0][i]<<= shift_y;
343 s->sprite_delta[1][i]<<= shift_y;
344 s->sprite_shift[i]= 16;
346 s->real_sprite_warping_points= s->num_sprite_warping_points;
351 * decodes the next video packet.
352 * @return <0 if something went wrong
354 int mpeg4_decode_video_packet_header(MpegEncContext *s)
356 int mb_num_bits= av_log2(s->mb_num - 1) + 1;
357 int header_extension=0, mb_num, len;
359 /* is there enough space left for a video packet + header */
360 if( get_bits_count(&s->gb) > s->gb.size_in_bits-20) return -1;
362 for(len=0; len<32; len++){
363 if(get_bits1(&s->gb)) break;
366 if(len!=ff_mpeg4_get_video_packet_prefix_length(s)){
367 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
371 if(s->shape != RECT_SHAPE){
372 header_extension= get_bits1(&s->gb);
373 //FIXME more stuff here
376 mb_num= get_bits(&s->gb, mb_num_bits);
377 if(mb_num>=s->mb_num){
378 av_log(s->avctx, AV_LOG_ERROR, "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
382 s->mb_x= mb_num % s->mb_width;
383 s->mb_y= mb_num / s->mb_width;
385 if(s->shape != BIN_ONLY_SHAPE){
386 int qscale= get_bits(&s->gb, s->quant_precision);
388 s->chroma_qscale=s->qscale= qscale;
391 if(s->shape == RECT_SHAPE){
392 header_extension= get_bits1(&s->gb);
394 if(header_extension){
397 while (get_bits1(&s->gb) != 0)
400 check_marker(&s->gb, "before time_increment in video packed header");
401 skip_bits(&s->gb, s->time_increment_bits); /* time_increment */
402 check_marker(&s->gb, "before vop_coding_type in video packed header");
404 skip_bits(&s->gb, 2); /* vop coding type */
405 //FIXME not rect stuff here
407 if(s->shape != BIN_ONLY_SHAPE){
408 skip_bits(&s->gb, 3); /* intra dc vlc threshold */
409 //FIXME don't just ignore everything
410 if(s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
411 mpeg4_decode_sprite_trajectory(s, &s->gb);
412 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
415 //FIXME reduced res stuff here
417 if (s->pict_type != AV_PICTURE_TYPE_I) {
418 int f_code = get_bits(&s->gb, 3); /* fcode_for */
420 av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (f_code=0)\n");
423 if (s->pict_type == AV_PICTURE_TYPE_B) {
424 int b_code = get_bits(&s->gb, 3);
426 av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (b_code=0)\n");
431 //FIXME new-pred stuff
437 * gets the average motion vector for a GMC MB.
438 * @param n either 0 for the x component or 1 for y
439 * @return the average MV for a GMC MB
441 static inline int get_amv(MpegEncContext *s, int n){
442 int x, y, mb_v, sum, dx, dy, shift;
443 int len = 1 << (s->f_code + 4);
444 const int a= s->sprite_warping_accuracy;
446 if(s->workaround_bugs & FF_BUG_AMV)
447 len >>= s->quarter_sample;
449 if(s->real_sprite_warping_points==1){
450 if(s->divx_version==500 && s->divx_build==413)
451 sum= s->sprite_offset[0][n] / (1<<(a - s->quarter_sample));
453 sum= RSHIFT(s->sprite_offset[0][n]<<s->quarter_sample, a);
455 dx= s->sprite_delta[n][0];
456 dy= s->sprite_delta[n][1];
457 shift= s->sprite_shift[0];
458 if(n) dy -= 1<<(shift + a + 1);
459 else dx -= 1<<(shift + a + 1);
460 mb_v= s->sprite_offset[0][n] + dx*s->mb_x*16 + dy*s->mb_y*16;
473 sum= RSHIFT(sum, a+8-s->quarter_sample);
476 if (sum < -len) sum= -len;
477 else if (sum >= len) sum= len-1;
483 * decodes the dc value.
484 * @param n block index (0-3 are luma, 4-5 are chroma)
485 * @param dir_ptr the prediction direction will be stored here
486 * @return the quantized dc
488 static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
493 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
495 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
496 if (code < 0 || code > 9 /* && s->nbit<9 */){
497 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
505 level= 2*get_bits1(&s->gb)-1;
507 if(get_bits1(&s->gb))
508 level = get_bits(&s->gb, code-1) + (1<<(code-1));
510 level = -get_bits(&s->gb, code-1) - (1<<(code-1));
513 level = get_xbits(&s->gb, code);
517 if(get_bits1(&s->gb)==0){ /* marker */
518 if(s->error_recognition>=2){
519 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
526 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
530 * decodes first partition.
531 * @return number of MBs decoded or <0 if an error occurred
533 static int mpeg4_decode_partition_a(MpegEncContext *s){
535 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
537 /* decode first partition */
539 s->first_slice_line=1;
540 for(; s->mb_y<s->mb_height; s->mb_y++){
541 ff_init_block_index(s);
542 for(; s->mb_x<s->mb_width; s->mb_x++){
543 const int xy= s->mb_x + s->mb_y*s->mb_stride;
548 ff_update_block_index(s);
549 if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
550 s->first_slice_line=0;
552 if(s->pict_type==AV_PICTURE_TYPE_I){
556 if(show_bits_long(&s->gb, 19)==DC_MARKER){
560 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
562 av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
567 s->cbp_table[xy]= cbpc & 3;
568 s->current_picture.f.mb_type[xy] = MB_TYPE_INTRA;
572 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
574 s->current_picture.f.qscale_table[xy]= s->qscale;
576 s->mbintra_table[xy]= 1;
579 int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
581 av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
585 if(dc_pred_dir) dir|=1;
587 s->pred_dir_table[xy]= dir;
588 }else{ /* P/S_TYPE */
589 int mx, my, pred_x, pred_y, bits;
590 int16_t * const mot_val = s->current_picture.f.motion_val[0][s->block_index[0]];
591 const int stride= s->b8_stride*2;
594 bits= show_bits(&s->gb, 17);
595 if(bits==MOTION_MARKER){
601 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
602 s->current_picture.f.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
606 s->current_picture.f.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
609 mot_val[0 ]= mot_val[2 ]=
610 mot_val[0+stride]= mot_val[2+stride]= mx;
611 mot_val[1 ]= mot_val[3 ]=
612 mot_val[1+stride]= mot_val[3+stride]= my;
614 if(s->mbintra_table[xy])
615 ff_clean_intra_table_entries(s);
619 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
621 av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
627 s->cbp_table[xy]= cbpc&(8+3); //8 is dquant
629 s->mb_intra = ((cbpc & 4) != 0);
632 s->current_picture.f.mb_type[xy] = MB_TYPE_INTRA;
633 s->mbintra_table[xy]= 1;
634 mot_val[0 ]= mot_val[2 ]=
635 mot_val[0+stride]= mot_val[2+stride]= 0;
636 mot_val[1 ]= mot_val[3 ]=
637 mot_val[1+stride]= mot_val[3+stride]= 0;
639 if(s->mbintra_table[xy])
640 ff_clean_intra_table_entries(s);
642 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
643 s->mcsel= get_bits1(&s->gb);
646 if ((cbpc & 16) == 0) {
647 /* 16x16 motion prediction */
649 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
651 mx = h263_decode_motion(s, pred_x, s->f_code);
655 my = h263_decode_motion(s, pred_y, s->f_code);
658 s->current_picture.f.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
662 s->current_picture.f.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
665 mot_val[0 ]= mot_val[2 ] =
666 mot_val[0+stride]= mot_val[2+stride]= mx;
667 mot_val[1 ]= mot_val[3 ]=
668 mot_val[1+stride]= mot_val[3+stride]= my;
671 s->current_picture.f.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
673 int16_t *mot_val= h263_pred_motion(s, i, 0, &pred_x, &pred_y);
674 mx = h263_decode_motion(s, pred_x, s->f_code);
678 my = h263_decode_motion(s, pred_y, s->f_code);
695 * decode second partition.
696 * @return <0 if an error occurred
698 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count){
700 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
702 s->mb_x= s->resync_mb_x;
703 s->first_slice_line=1;
704 for(s->mb_y= s->resync_mb_y; mb_num < mb_count; s->mb_y++){
705 ff_init_block_index(s);
706 for(; mb_num < mb_count && s->mb_x<s->mb_width; s->mb_x++){
707 const int xy= s->mb_x + s->mb_y*s->mb_stride;
710 ff_update_block_index(s);
711 if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
712 s->first_slice_line=0;
714 if(s->pict_type==AV_PICTURE_TYPE_I){
715 int ac_pred= get_bits1(&s->gb);
716 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
718 av_log(s->avctx, AV_LOG_ERROR, "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
722 s->cbp_table[xy]|= cbpy<<2;
723 s->current_picture.f.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
724 }else{ /* P || S_TYPE */
725 if (IS_INTRA(s->current_picture.f.mb_type[xy])) {
727 int ac_pred = get_bits1(&s->gb);
728 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
731 av_log(s->avctx, AV_LOG_ERROR, "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
735 if(s->cbp_table[xy] & 8) {
736 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
738 s->current_picture.f.qscale_table[xy] = s->qscale;
742 int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
744 av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
748 if(dc_pred_dir) dir|=1;
750 s->cbp_table[xy]&= 3; //remove dquant
751 s->cbp_table[xy]|= cbpy<<2;
752 s->current_picture.f.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
753 s->pred_dir_table[xy]= dir;
754 } else if (IS_SKIP(s->current_picture.f.mb_type[xy])) {
755 s->current_picture.f.qscale_table[xy] = s->qscale;
758 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
761 av_log(s->avctx, AV_LOG_ERROR, "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
765 if(s->cbp_table[xy] & 8) {
766 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
768 s->current_picture.f.qscale_table[xy] = s->qscale;
770 s->cbp_table[xy]&= 3; //remove dquant
771 s->cbp_table[xy]|= (cbpy^0xf)<<2;
775 if(mb_num >= mb_count) return 0;
782 * decodes the first & second partition
783 * @return <0 if error (and sets error type in the error_status_table)
785 int ff_mpeg4_decode_partitions(MpegEncContext *s)
788 const int part_a_error= s->pict_type==AV_PICTURE_TYPE_I ? (DC_ERROR|MV_ERROR) : MV_ERROR;
789 const int part_a_end = s->pict_type==AV_PICTURE_TYPE_I ? (DC_END |MV_END) : MV_END;
791 mb_num= mpeg4_decode_partition_a(s);
793 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
797 if(s->resync_mb_x + s->resync_mb_y*s->mb_width + mb_num > s->mb_num){
798 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
799 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
803 s->mb_num_left= mb_num;
805 if(s->pict_type==AV_PICTURE_TYPE_I){
806 while(show_bits(&s->gb, 9) == 1)
807 skip_bits(&s->gb, 9);
808 if(get_bits_long(&s->gb, 19)!=DC_MARKER){
809 av_log(s->avctx, AV_LOG_ERROR, "marker missing after first I partition at %d %d\n", s->mb_x, s->mb_y);
813 while(show_bits(&s->gb, 10) == 1)
814 skip_bits(&s->gb, 10);
815 if(get_bits(&s->gb, 17)!=MOTION_MARKER){
816 av_log(s->avctx, AV_LOG_ERROR, "marker missing after first P partition at %d %d\n", s->mb_x, s->mb_y);
820 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, part_a_end);
822 if( mpeg4_decode_partition_b(s, mb_num) < 0){
823 if(s->pict_type==AV_PICTURE_TYPE_P)
824 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, DC_ERROR);
827 if(s->pict_type==AV_PICTURE_TYPE_P)
828 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, DC_END);
836 * @return <0 if an error occurred
838 static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
839 int n, int coded, int intra, int rvlc)
841 int level, i, last, run;
844 RL_VLC_ELEM * rl_vlc;
845 const uint8_t * scan_table;
848 //Note intra & rvlc should be optimized away if this is inlined
851 if(s->use_intra_dc_vlc){
853 if(s->partitioned_frame){
854 level = s->dc_val[0][ s->block_index[n] ];
855 if(n<4) level= FASTDIV((level + (s->y_dc_scale>>1)), s->y_dc_scale);
856 else level= FASTDIV((level + (s->c_dc_scale>>1)), s->c_dc_scale);
857 dc_pred_dir= (s->pred_dir_table[s->mb_x + s->mb_y*s->mb_stride]<<n)&32;
859 level = mpeg4_decode_dc(s, n, &dc_pred_dir);
867 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
874 rl_vlc = rvlc_rl_intra.rl_vlc[0];
876 rl = &ff_mpeg4_rl_intra;
877 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
880 if (dc_pred_dir == 0)
881 scan_table = s->intra_v_scantable.permutated; /* left */
883 scan_table = s->intra_h_scantable.permutated; /* top */
885 scan_table = s->intra_scantable.permutated;
892 s->block_last_index[n] = i;
895 if(rvlc) rl = &rvlc_rl_inter;
896 else rl = &ff_h263_rl_inter;
898 scan_table = s->intra_scantable.permutated;
904 rl_vlc = rvlc_rl_inter.rl_vlc[0];
906 rl_vlc = ff_h263_rl_inter.rl_vlc[0];
909 qmul = s->qscale << 1;
910 qadd = (s->qscale - 1) | 1;
912 rl_vlc = rvlc_rl_inter.rl_vlc[s->qscale];
914 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
919 OPEN_READER(re, &s->gb);
921 UPDATE_CACHE(re, &s->gb);
922 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
926 if(SHOW_UBITS(re, &s->gb, 1)==0){
927 av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in rvlc esc\n");
929 }; SKIP_CACHE(re, &s->gb, 1);
931 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
932 run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6);
933 SKIP_COUNTER(re, &s->gb, 1+1+6);
934 UPDATE_CACHE(re, &s->gb);
936 if(SHOW_UBITS(re, &s->gb, 1)==0){
937 av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in rvlc esc\n");
939 }; SKIP_CACHE(re, &s->gb, 1);
941 level= SHOW_UBITS(re, &s->gb, 11); SKIP_CACHE(re, &s->gb, 11);
943 if(SHOW_UBITS(re, &s->gb, 5)!=0x10){
944 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
946 }; SKIP_CACHE(re, &s->gb, 5);
948 level= level * qmul + qadd;
949 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_CACHE(re, &s->gb, 1);
950 SKIP_COUNTER(re, &s->gb, 1+11+5+1);
956 cache= GET_CACHE(re, &s->gb);
961 if (cache&0x80000000) {
962 if (cache&0x40000000) {
964 SKIP_CACHE(re, &s->gb, 2);
965 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
966 run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6);
967 SKIP_COUNTER(re, &s->gb, 2+1+6);
968 UPDATE_CACHE(re, &s->gb);
971 level= SHOW_SBITS(re, &s->gb, 12); LAST_SKIP_BITS(re, &s->gb, 12);
973 if(SHOW_UBITS(re, &s->gb, 1)==0){
974 av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in 3. esc\n");
976 }; SKIP_CACHE(re, &s->gb, 1);
978 level= SHOW_SBITS(re, &s->gb, 12); SKIP_CACHE(re, &s->gb, 12);
980 if(SHOW_UBITS(re, &s->gb, 1)==0){
981 av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in 3. esc\n");
983 }; LAST_SKIP_CACHE(re, &s->gb, 1);
985 SKIP_COUNTER(re, &s->gb, 1+12+1);
989 if(s->error_recognition >= FF_ER_COMPLIANT){
990 const int abs_level= FFABS(level);
991 if(abs_level<=MAX_LEVEL && run<=MAX_RUN){
992 const int run1= run - rl->max_run[last][abs_level] - 1;
993 if(abs_level <= rl->max_level[last][run]){
994 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
997 if(s->error_recognition > FF_ER_COMPLIANT){
998 if(abs_level <= rl->max_level[last][run]*2){
999 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1002 if(run1 >= 0 && abs_level <= rl->max_level[last][run1]){
1003 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1010 if (level>0) level= level * qmul + qadd;
1011 else level= level * qmul - qadd;
1013 if((unsigned)(level + 2048) > 4095){
1014 if(s->error_recognition > FF_ER_COMPLIANT){
1015 if(level > 2560 || level<-2560){
1016 av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc, qp=%d\n", s->qscale);
1020 level= level<0 ? -2048 : 2047;
1027 SKIP_BITS(re, &s->gb, 2);
1028 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1029 i+= run + rl->max_run[run>>7][level/qmul] +1; //FIXME opt indexing
1030 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1031 LAST_SKIP_BITS(re, &s->gb, 1);
1035 SKIP_BITS(re, &s->gb, 1);
1036 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1038 level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
1039 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1040 LAST_SKIP_BITS(re, &s->gb, 1);
1045 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1046 LAST_SKIP_BITS(re, &s->gb, 1);
1051 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1055 block[scan_table[i]] = level;
1059 block[scan_table[i]] = level;
1061 CLOSE_READER(re, &s->gb);
1065 if(!s->use_intra_dc_vlc){
1066 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1068 i -= i>>31; //if(i == -1) i=0;
1071 mpeg4_pred_ac(s, block, n, dc_pred_dir);
1073 i = 63; /* XXX: not optimal */
1076 s->block_last_index[n] = i;
1081 * decode partition C of one MB.
1082 * @return <0 if an error occurred
1084 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, DCTELEM block[6][64])
1087 const int xy= s->mb_x + s->mb_y*s->mb_stride;
1089 mb_type = s->current_picture.f.mb_type[xy];
1090 cbp = s->cbp_table[xy];
1092 s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
1094 if (s->current_picture.f.qscale_table[xy] != s->qscale) {
1095 ff_set_qscale(s, s->current_picture.f.qscale_table[xy]);
1098 if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type==AV_PICTURE_TYPE_S) {
1101 s->mv[0][i][0] = s->current_picture.f.motion_val[0][s->block_index[i]][0];
1102 s->mv[0][i][1] = s->current_picture.f.motion_val[0][s->block_index[i]][1];
1104 s->mb_intra = IS_INTRA(mb_type);
1106 if (IS_SKIP(mb_type)) {
1109 s->block_last_index[i] = -1;
1110 s->mv_dir = MV_DIR_FORWARD;
1111 s->mv_type = MV_TYPE_16X16;
1112 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
1119 }else if(s->mb_intra){
1120 s->ac_pred = IS_ACPRED(s->current_picture.f.mb_type[xy]);
1121 }else if(!s->mb_intra){
1122 // s->mcsel= 0; //FIXME do we need to init that
1124 s->mv_dir = MV_DIR_FORWARD;
1125 if (IS_8X8(mb_type)) {
1126 s->mv_type = MV_TYPE_8X8;
1128 s->mv_type = MV_TYPE_16X16;
1131 } else { /* I-Frame */
1133 s->ac_pred = IS_ACPRED(s->current_picture.f.mb_type[xy]);
1136 if (!IS_SKIP(mb_type)) {
1138 s->dsp.clear_blocks(s->block[0]);
1139 /* decode each block */
1140 for (i = 0; i < 6; i++) {
1141 if(mpeg4_decode_block(s, block[i], i, cbp&32, s->mb_intra, s->rvlc) < 0){
1142 av_log(s->avctx, AV_LOG_ERROR, "texture corrupted at %d %d %d\n", s->mb_x, s->mb_y, s->mb_intra);
1149 /* per-MB end of slice check */
1151 if(--s->mb_num_left <= 0){
1152 if(mpeg4_is_resync(s))
1157 if(mpeg4_is_resync(s)){
1158 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1159 if(s->cbp_table[xy+delta])
1166 static int mpeg4_decode_mb(MpegEncContext *s,
1167 DCTELEM block[6][64])
1169 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1171 static int8_t quant_tab[4] = { -1, -2, 1, 2 };
1172 const int xy= s->mb_x + s->mb_y * s->mb_stride;
1174 assert(s->h263_pred);
1176 if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type==AV_PICTURE_TYPE_S) {
1178 if (get_bits1(&s->gb)) {
1182 s->block_last_index[i] = -1;
1183 s->mv_dir = MV_DIR_FORWARD;
1184 s->mv_type = MV_TYPE_16X16;
1185 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
1186 s->current_picture.f.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
1188 s->mv[0][0][0]= get_amv(s, 0);
1189 s->mv[0][0][1]= get_amv(s, 1);
1193 s->current_picture.f.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
1201 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1203 av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1208 s->dsp.clear_blocks(s->block[0]);
1210 s->mb_intra = ((cbpc & 4) != 0);
1211 if (s->mb_intra) goto intra;
1213 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
1214 s->mcsel= get_bits1(&s->gb);
1216 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1218 cbp = (cbpc & 3) | (cbpy << 2);
1220 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1222 if((!s->progressive_sequence) && (cbp || (s->workaround_bugs&FF_BUG_XVID_ILACE)))
1223 s->interlaced_dct= get_bits1(&s->gb);
1225 s->mv_dir = MV_DIR_FORWARD;
1226 if ((cbpc & 16) == 0) {
1228 s->current_picture.f.mb_type[xy] = MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
1229 /* 16x16 global motion prediction */
1230 s->mv_type = MV_TYPE_16X16;
1233 s->mv[0][0][0] = mx;
1234 s->mv[0][0][1] = my;
1235 }else if((!s->progressive_sequence) && get_bits1(&s->gb)){
1236 s->current_picture.f.mb_type[xy] = MB_TYPE_16x8 | MB_TYPE_L0 | MB_TYPE_INTERLACED;
1237 /* 16x8 field motion prediction */
1238 s->mv_type= MV_TYPE_FIELD;
1240 s->field_select[0][0]= get_bits1(&s->gb);
1241 s->field_select[0][1]= get_bits1(&s->gb);
1243 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1246 mx = h263_decode_motion(s, pred_x, s->f_code);
1250 my = h263_decode_motion(s, pred_y/2, s->f_code);
1254 s->mv[0][i][0] = mx;
1255 s->mv[0][i][1] = my;
1258 s->current_picture.f.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1259 /* 16x16 motion prediction */
1260 s->mv_type = MV_TYPE_16X16;
1261 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1262 mx = h263_decode_motion(s, pred_x, s->f_code);
1267 my = h263_decode_motion(s, pred_y, s->f_code);
1271 s->mv[0][0][0] = mx;
1272 s->mv[0][0][1] = my;
1275 s->current_picture.f.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1276 s->mv_type = MV_TYPE_8X8;
1278 mot_val = h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1279 mx = h263_decode_motion(s, pred_x, s->f_code);
1283 my = h263_decode_motion(s, pred_y, s->f_code);
1286 s->mv[0][i][0] = mx;
1287 s->mv[0][i][1] = my;
1292 } else if(s->pict_type==AV_PICTURE_TYPE_B) {
1293 int modb1; // first bit of modb
1294 int modb2; // second bit of modb
1297 s->mb_intra = 0; //B-frames never contain intra blocks
1298 s->mcsel=0; // ... true gmc blocks
1302 s->last_mv[i][0][0]=
1303 s->last_mv[i][0][1]=
1304 s->last_mv[i][1][0]=
1305 s->last_mv[i][1][1]= 0;
1308 ff_thread_await_progress((AVFrame*)s->next_picture_ptr, s->mb_y, 0);
1311 /* if we skipped it in the future P Frame than skip it now too */
1312 s->mb_skipped = s->next_picture.f.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1317 s->block_last_index[i] = -1;
1319 s->mv_dir = MV_DIR_FORWARD;
1320 s->mv_type = MV_TYPE_16X16;
1325 s->current_picture.f.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
1329 modb1= get_bits1(&s->gb);
1331 mb_type= MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1; //like MB_TYPE_B_DIRECT but no vectors coded
1334 modb2= get_bits1(&s->gb);
1335 mb_type= get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1337 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1340 mb_type= mb_type_b_map[ mb_type ];
1343 s->dsp.clear_blocks(s->block[0]);
1344 cbp= get_bits(&s->gb, 6);
1347 if ((!IS_DIRECT(mb_type)) && cbp) {
1348 if(get_bits1(&s->gb)){
1349 ff_set_qscale(s, s->qscale + get_bits1(&s->gb)*4 - 2);
1353 if(!s->progressive_sequence){
1355 s->interlaced_dct= get_bits1(&s->gb);
1357 if(!IS_DIRECT(mb_type) && get_bits1(&s->gb)){
1358 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1359 mb_type &= ~MB_TYPE_16x16;
1361 if(USES_LIST(mb_type, 0)){
1362 s->field_select[0][0]= get_bits1(&s->gb);
1363 s->field_select[0][1]= get_bits1(&s->gb);
1365 if(USES_LIST(mb_type, 1)){
1366 s->field_select[1][0]= get_bits1(&s->gb);
1367 s->field_select[1][1]= get_bits1(&s->gb);
1373 if((mb_type & (MB_TYPE_DIRECT2|MB_TYPE_INTERLACED)) == 0){
1374 s->mv_type= MV_TYPE_16X16;
1376 if(USES_LIST(mb_type, 0)){
1377 s->mv_dir = MV_DIR_FORWARD;
1379 mx = h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1380 my = h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1381 s->last_mv[0][1][0]= s->last_mv[0][0][0]= s->mv[0][0][0] = mx;
1382 s->last_mv[0][1][1]= s->last_mv[0][0][1]= s->mv[0][0][1] = my;
1385 if(USES_LIST(mb_type, 1)){
1386 s->mv_dir |= MV_DIR_BACKWARD;
1388 mx = h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1389 my = h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1390 s->last_mv[1][1][0]= s->last_mv[1][0][0]= s->mv[1][0][0] = mx;
1391 s->last_mv[1][1][1]= s->last_mv[1][0][1]= s->mv[1][0][1] = my;
1393 }else if(!IS_DIRECT(mb_type)){
1394 s->mv_type= MV_TYPE_FIELD;
1396 if(USES_LIST(mb_type, 0)){
1397 s->mv_dir = MV_DIR_FORWARD;
1400 mx = h263_decode_motion(s, s->last_mv[0][i][0] , s->f_code);
1401 my = h263_decode_motion(s, s->last_mv[0][i][1]/2, s->f_code);
1402 s->last_mv[0][i][0]= s->mv[0][i][0] = mx;
1403 s->last_mv[0][i][1]= (s->mv[0][i][1] = my)*2;
1407 if(USES_LIST(mb_type, 1)){
1408 s->mv_dir |= MV_DIR_BACKWARD;
1411 mx = h263_decode_motion(s, s->last_mv[1][i][0] , s->b_code);
1412 my = h263_decode_motion(s, s->last_mv[1][i][1]/2, s->b_code);
1413 s->last_mv[1][i][0]= s->mv[1][i][0] = mx;
1414 s->last_mv[1][i][1]= (s->mv[1][i][1] = my)*2;
1420 if(IS_DIRECT(mb_type)){
1421 if(IS_SKIP(mb_type))
1424 mx = h263_decode_motion(s, 0, 1);
1425 my = h263_decode_motion(s, 0, 1);
1428 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1429 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1431 s->current_picture.f.mb_type[xy] = mb_type;
1432 } else { /* I-Frame */
1434 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1436 av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1444 s->ac_pred = get_bits1(&s->gb);
1446 s->current_picture.f.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1448 s->current_picture.f.mb_type[xy] = MB_TYPE_INTRA;
1450 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1452 av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1455 cbp = (cbpc & 3) | (cbpy << 2);
1457 s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
1460 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1463 if(!s->progressive_sequence)
1464 s->interlaced_dct= get_bits1(&s->gb);
1466 s->dsp.clear_blocks(s->block[0]);
1467 /* decode each block */
1468 for (i = 0; i < 6; i++) {
1469 if (mpeg4_decode_block(s, block[i], i, cbp&32, 1, 0) < 0)
1476 /* decode each block */
1477 for (i = 0; i < 6; i++) {
1478 if (mpeg4_decode_block(s, block[i], i, cbp&32, 0, 0) < 0)
1484 /* per-MB end of slice check */
1485 if(s->codec_id==CODEC_ID_MPEG4){
1486 int next= mpeg4_is_resync(s);
1488 if (s->mb_x + s->mb_y*s->mb_width + 1 > next && s->avctx->error_recognition >= FF_ER_AGGRESSIVE) {
1490 } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1493 if(s->pict_type==AV_PICTURE_TYPE_B){
1494 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
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);
1497 if (s->next_picture.f.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 mpeg4_decode_profile_level(MpegEncContext * s, GetBitContext *gb){
1532 s->avctx->profile = get_bits(gb, 4);
1533 s->avctx->level = get_bits(gb, 4);
1535 // for Simple profile, level 0
1536 if (s->avctx->profile == 0 && s->avctx->level == 8) {
1537 s->avctx->level = 0;
1543 static int decode_vol_header(MpegEncContext *s, GetBitContext *gb){
1544 int width, height, vo_ver_id;
1547 skip_bits(gb, 1); /* random access */
1548 s->vo_type= get_bits(gb, 8);
1549 if (get_bits1(gb) != 0) { /* is_ol_id */
1550 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1551 skip_bits(gb, 3); /* vo_priority */
1555 s->aspect_ratio_info= get_bits(gb, 4);
1556 if(s->aspect_ratio_info == FF_ASPECT_EXTENDED){
1557 s->avctx->sample_aspect_ratio.num= get_bits(gb, 8); // par_width
1558 s->avctx->sample_aspect_ratio.den= get_bits(gb, 8); // par_height
1560 s->avctx->sample_aspect_ratio= ff_h263_pixel_aspect[s->aspect_ratio_info];
1563 if ((s->vol_control_parameters=get_bits1(gb))) { /* vol control parameter */
1564 int chroma_format= get_bits(gb, 2);
1565 if(chroma_format!=CHROMA_420){
1566 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1568 s->low_delay= get_bits1(gb);
1569 if(get_bits1(gb)){ /* vbv parameters */
1570 get_bits(gb, 15); /* first_half_bitrate */
1571 skip_bits1(gb); /* marker */
1572 get_bits(gb, 15); /* latter_half_bitrate */
1573 skip_bits1(gb); /* marker */
1574 get_bits(gb, 15); /* first_half_vbv_buffer_size */
1575 skip_bits1(gb); /* marker */
1576 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1577 get_bits(gb, 11); /* first_half_vbv_occupancy */
1578 skip_bits1(gb); /* marker */
1579 get_bits(gb, 15); /* latter_half_vbv_occupancy */
1580 skip_bits1(gb); /* marker */
1583 // set low delay flag only once the smartest? low delay detection won't be overriden
1584 if(s->picture_number==0)
1588 s->shape = get_bits(gb, 2); /* vol shape */
1589 if(s->shape != RECT_SHAPE) av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1590 if(s->shape == GRAY_SHAPE && vo_ver_id != 1){
1591 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1592 skip_bits(gb, 4); //video_object_layer_shape_extension
1595 check_marker(gb, "before time_increment_resolution");
1597 s->avctx->time_base.den = get_bits(gb, 16);
1598 if(!s->avctx->time_base.den){
1599 av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n");
1600 s->avctx->time_base.num = 0;
1604 s->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
1605 if (s->time_increment_bits < 1)
1606 s->time_increment_bits = 1;
1608 check_marker(gb, "before fixed_vop_rate");
1610 if (get_bits1(gb) != 0) { /* fixed_vop_rate */
1611 s->avctx->time_base.num = get_bits(gb, s->time_increment_bits);
1613 s->avctx->time_base.num = 1;
1617 if (s->shape != BIN_ONLY_SHAPE) {
1618 if (s->shape == RECT_SHAPE) {
1619 skip_bits1(gb); /* marker */
1620 width = get_bits(gb, 13);
1621 skip_bits1(gb); /* marker */
1622 height = get_bits(gb, 13);
1623 skip_bits1(gb); /* marker */
1624 if(width && height && !(s->width && s->codec_tag == AV_RL32("MP4S"))){ /* they should be non zero but who knows ... */
1630 s->progressive_sequence=
1631 s->progressive_frame= get_bits1(gb)^1;
1632 s->interlaced_dct=0;
1633 if(!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1634 av_log(s->avctx, AV_LOG_INFO, "MPEG4 OBMC not supported (very likely buggy encoder)\n"); /* OBMC Disable */
1635 if (vo_ver_id == 1) {
1636 s->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1638 s->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1640 if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1641 if(s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE){
1642 if(s->vol_sprite_usage==STATIC_SPRITE){
1643 s->sprite_width = get_bits(gb, 13);
1644 skip_bits1(gb); /* marker */
1645 s->sprite_height= get_bits(gb, 13);
1646 skip_bits1(gb); /* marker */
1647 s->sprite_left = get_bits(gb, 13);
1648 skip_bits1(gb); /* marker */
1649 s->sprite_top = get_bits(gb, 13);
1650 skip_bits1(gb); /* marker */
1652 s->num_sprite_warping_points= get_bits(gb, 6);
1653 if(s->num_sprite_warping_points > 3){
1654 av_log(s->avctx, AV_LOG_ERROR, "%d sprite_warping_points\n", s->num_sprite_warping_points);
1655 s->num_sprite_warping_points= 0;
1658 s->sprite_warping_accuracy = get_bits(gb, 2);
1659 s->sprite_brightness_change= get_bits1(gb);
1660 if(s->vol_sprite_usage==STATIC_SPRITE)
1661 s->low_latency_sprite= get_bits1(gb);
1663 // FIXME sadct disable bit if verid!=1 && shape not rect
1665 if (get_bits1(gb) == 1) { /* not_8_bit */
1666 s->quant_precision = get_bits(gb, 4); /* quant_precision */
1667 if(get_bits(gb, 4)!=8) av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n"); /* bits_per_pixel */
1668 if(s->quant_precision!=5) av_log(s->avctx, AV_LOG_ERROR, "quant precision %d\n", s->quant_precision);
1670 s->quant_precision = 5;
1673 // FIXME a bunch of grayscale shape things
1675 if((s->mpeg_quant=get_bits1(gb))){ /* vol_quant_type */
1678 /* load default matrixes */
1679 for(i=0; i<64; i++){
1680 int j= s->dsp.idct_permutation[i];
1681 v= ff_mpeg4_default_intra_matrix[i];
1682 s->intra_matrix[j]= v;
1683 s->chroma_intra_matrix[j]= v;
1685 v= ff_mpeg4_default_non_intra_matrix[i];
1686 s->inter_matrix[j]= v;
1687 s->chroma_inter_matrix[j]= v;
1690 /* load custom intra matrix */
1693 for(i=0; i<64; i++){
1699 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1700 s->intra_matrix[j]= v;
1701 s->chroma_intra_matrix[j]= v;
1704 /* replicate last value */
1706 int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1707 s->intra_matrix[j]= last;
1708 s->chroma_intra_matrix[j]= last;
1712 /* load custom non intra matrix */
1715 for(i=0; i<64; i++){
1721 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1722 s->inter_matrix[j]= v;
1723 s->chroma_inter_matrix[j]= v;
1726 /* replicate last value */
1728 int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1729 s->inter_matrix[j]= last;
1730 s->chroma_inter_matrix[j]= last;
1734 // FIXME a bunch of grayscale shape things
1738 s->quarter_sample= get_bits1(gb);
1739 else s->quarter_sample=0;
1742 int pos= get_bits_count(gb);
1743 int estimation_method= get_bits(gb, 2);
1744 if(estimation_method<2){
1746 s->cplx_estimation_trash_i += 8*get_bits1(gb); //opaque
1747 s->cplx_estimation_trash_i += 8*get_bits1(gb); //transparent
1748 s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_cae
1749 s->cplx_estimation_trash_i += 8*get_bits1(gb); //inter_cae
1750 s->cplx_estimation_trash_i += 8*get_bits1(gb); //no_update
1751 s->cplx_estimation_trash_i += 8*get_bits1(gb); //upampling
1754 s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_blocks
1755 s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter_blocks
1756 s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter4v_blocks
1757 s->cplx_estimation_trash_i += 8*get_bits1(gb); //not coded blocks
1759 if(!check_marker(gb, "in complexity estimation part 1")){
1760 skip_bits_long(gb, pos - get_bits_count(gb));
1764 s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_coeffs
1765 s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_lines
1766 s->cplx_estimation_trash_i += 8*get_bits1(gb); //vlc_syms
1767 s->cplx_estimation_trash_i += 4*get_bits1(gb); //vlc_bits
1770 s->cplx_estimation_trash_p += 8*get_bits1(gb); //apm
1771 s->cplx_estimation_trash_p += 8*get_bits1(gb); //npm
1772 s->cplx_estimation_trash_b += 8*get_bits1(gb); //interpolate_mc_q
1773 s->cplx_estimation_trash_p += 8*get_bits1(gb); //forwback_mc_q
1774 s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel2
1775 s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel4
1777 if(!check_marker(gb, "in complexity estimation part 2")){
1778 skip_bits_long(gb, pos - get_bits_count(gb));
1781 if(estimation_method==1){
1782 s->cplx_estimation_trash_i += 8*get_bits1(gb); //sadct
1783 s->cplx_estimation_trash_p += 8*get_bits1(gb); //qpel
1786 av_log(s->avctx, AV_LOG_ERROR, "Invalid Complexity estimation method %d\n", estimation_method);
1789 s->cplx_estimation_trash_i=
1790 s->cplx_estimation_trash_p=
1791 s->cplx_estimation_trash_b= 0;
1794 s->resync_marker= !get_bits1(gb); /* resync_marker_disabled */
1796 s->data_partitioning= get_bits1(gb);
1797 if(s->data_partitioning){
1798 s->rvlc= get_bits1(gb);
1801 if(vo_ver_id != 1) {
1802 s->new_pred= get_bits1(gb);
1804 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
1805 skip_bits(gb, 2); /* requested upstream message type */
1806 skip_bits1(gb); /* newpred segment type */
1808 s->reduced_res_vop= get_bits1(gb);
1809 if(s->reduced_res_vop) av_log(s->avctx, AV_LOG_ERROR, "reduced resolution VOP not supported\n");
1813 s->reduced_res_vop= 0;
1816 s->scalability= get_bits1(gb);
1818 if (s->scalability) {
1819 GetBitContext bak= *gb;
1820 int h_sampling_factor_n;
1821 int h_sampling_factor_m;
1822 int v_sampling_factor_n;
1823 int v_sampling_factor_m;
1825 s->hierachy_type= get_bits1(gb);
1826 skip_bits(gb, 4); /* ref_layer_id */
1827 skip_bits1(gb); /* ref_layer_sampling_dir */
1828 h_sampling_factor_n= get_bits(gb, 5);
1829 h_sampling_factor_m= get_bits(gb, 5);
1830 v_sampling_factor_n= get_bits(gb, 5);
1831 v_sampling_factor_m= get_bits(gb, 5);
1832 s->enhancement_type= get_bits1(gb);
1834 if( h_sampling_factor_n==0 || h_sampling_factor_m==0
1835 || v_sampling_factor_n==0 || v_sampling_factor_m==0){
1836 /* illegal scalability header (VERY broken encoder),
1837 * trying to workaround */
1841 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
1843 // bin shape stuff FIXME
1850 * decodes the user data stuff in the header.
1851 * Also initializes divx/xvid/lavc_version/build.
1853 static int decode_user_data(MpegEncContext *s, GetBitContext *gb){
1857 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
1860 for(i=0; i<255 && get_bits_count(gb) < gb->size_in_bits; i++){
1861 if(show_bits(gb, 23) == 0) break;
1862 buf[i]= get_bits(gb, 8);
1866 /* divx detection */
1867 e=sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
1869 e=sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
1871 s->divx_version= ver;
1872 s->divx_build= build;
1873 s->divx_packed= e==3 && last=='p';
1874 if(s->divx_packed && !s->showed_packed_warning) {
1875 av_log(s->avctx, AV_LOG_WARNING, "Invalid and inefficient vfw-avi packed B frames detected\n");
1876 s->showed_packed_warning=1;
1880 /* ffmpeg detection */
1881 e=sscanf(buf, "FFmpe%*[^b]b%d", &build)+3;
1883 e=sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
1885 e=sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3)+1;
1887 build= (ver<<16) + (ver2<<8) + ver3;
1890 if(strcmp(buf, "ffmpeg")==0){
1891 s->lavc_build= 4600;
1895 s->lavc_build= build;
1898 /* Xvid detection */
1899 e=sscanf(buf, "XviD%d", &build);
1901 s->xvid_build= build;
1907 static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
1908 int time_incr, time_increment;
1910 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
1911 if(s->pict_type==AV_PICTURE_TYPE_B && s->low_delay && s->vol_control_parameters==0 && !(s->flags & CODEC_FLAG_LOW_DELAY)){
1912 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n");
1916 s->partitioned_frame= s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_B;
1917 if(s->partitioned_frame)
1918 s->decode_mb= mpeg4_decode_partitioned_mb;
1920 s->decode_mb= mpeg4_decode_mb;
1923 while (get_bits1(gb) != 0)
1926 check_marker(gb, "before time_increment");
1928 if(s->time_increment_bits==0 || !(show_bits(gb, s->time_increment_bits+1)&1)){
1929 av_log(s->avctx, AV_LOG_ERROR, "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
1931 for(s->time_increment_bits=1 ;s->time_increment_bits<16; s->time_increment_bits++){
1932 if ( s->pict_type == AV_PICTURE_TYPE_P
1933 || (s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE)) {
1934 if((show_bits(gb, s->time_increment_bits+6)&0x37) == 0x30) break;
1936 if((show_bits(gb, s->time_increment_bits+5)&0x1F) == 0x18) break;
1939 av_log(s->avctx, AV_LOG_ERROR, "my guess is %d bits ;)\n",s->time_increment_bits);
1942 if(IS_3IV1) time_increment= get_bits1(gb); //FIXME investigate further
1943 else time_increment= get_bits(gb, s->time_increment_bits);
1945 if(s->pict_type!=AV_PICTURE_TYPE_B){
1946 s->last_time_base= s->time_base;
1947 s->time_base+= time_incr;
1948 s->time= s->time_base*s->avctx->time_base.den + time_increment;
1949 if(s->workaround_bugs&FF_BUG_UMP4){
1950 if(s->time < s->last_non_b_time){
1951 /* header is not mpeg-4-compatible, broken encoder,
1952 * trying to workaround */
1954 s->time+= s->avctx->time_base.den;
1957 s->pp_time= s->time - s->last_non_b_time;
1958 s->last_non_b_time= s->time;
1960 s->time= (s->last_time_base + time_incr)*s->avctx->time_base.den + time_increment;
1961 s->pb_time= s->pp_time - (s->last_non_b_time - s->time);
1962 if(s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0){
1963 /* messed up order, maybe after seeking? skipping current b-frame */
1964 return FRAME_SKIPPED;
1966 ff_mpeg4_init_direct_mv(s);
1968 if(s->t_frame==0) s->t_frame= s->pb_time;
1969 if(s->t_frame==0) s->t_frame=1; // 1/0 protection
1970 s->pp_field_time= ( ROUNDED_DIV(s->last_non_b_time, s->t_frame)
1971 - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
1972 s->pb_field_time= ( ROUNDED_DIV(s->time, s->t_frame)
1973 - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
1974 if(!s->progressive_sequence){
1975 if(s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1)
1976 return FRAME_SKIPPED;
1980 if(s->avctx->time_base.num)
1981 s->current_picture_ptr->f.pts = (s->time + s->avctx->time_base.num / 2) / s->avctx->time_base.num;
1983 s->current_picture_ptr->f.pts = AV_NOPTS_VALUE;
1984 if(s->avctx->debug&FF_DEBUG_PTS)
1985 av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n",
1986 s->current_picture_ptr->f.pts);
1988 check_marker(gb, "before vop_coded");
1991 if (get_bits1(gb) != 1){
1992 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
1993 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
1994 return FRAME_SKIPPED;
1996 if (s->shape != BIN_ONLY_SHAPE && ( s->pict_type == AV_PICTURE_TYPE_P
1997 || (s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE))) {
1998 /* rounding type for motion estimation */
1999 s->no_rounding = get_bits1(gb);
2003 //FIXME reduced res stuff
2005 if (s->shape != RECT_SHAPE) {
2006 if (s->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2007 skip_bits(gb, 13); /* width */
2008 skip_bits1(gb); /* marker */
2009 skip_bits(gb, 13); /* height */
2010 skip_bits1(gb); /* marker */
2011 skip_bits(gb, 13); /* hor_spat_ref */
2012 skip_bits1(gb); /* marker */
2013 skip_bits(gb, 13); /* ver_spat_ref */
2015 skip_bits1(gb); /* change_CR_disable */
2017 if (get_bits1(gb) != 0) {
2018 skip_bits(gb, 8); /* constant_alpha_value */
2021 //FIXME complexity estimation stuff
2023 if (s->shape != BIN_ONLY_SHAPE) {
2024 skip_bits_long(gb, s->cplx_estimation_trash_i);
2025 if(s->pict_type != AV_PICTURE_TYPE_I)
2026 skip_bits_long(gb, s->cplx_estimation_trash_p);
2027 if(s->pict_type == AV_PICTURE_TYPE_B)
2028 skip_bits_long(gb, s->cplx_estimation_trash_b);
2030 s->intra_dc_threshold= mpeg4_dc_threshold[ get_bits(gb, 3) ];
2031 if(!s->progressive_sequence){
2032 s->top_field_first= get_bits1(gb);
2033 s->alternate_scan= get_bits1(gb);
2035 s->alternate_scan= 0;
2038 if(s->alternate_scan){
2039 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
2040 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
2041 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2042 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2044 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
2045 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
2046 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2047 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2050 if(s->pict_type == AV_PICTURE_TYPE_S && (s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE)){
2051 mpeg4_decode_sprite_trajectory(s, gb);
2052 if(s->sprite_brightness_change) av_log(s->avctx, AV_LOG_ERROR, "sprite_brightness_change not supported\n");
2053 if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2056 if (s->shape != BIN_ONLY_SHAPE) {
2057 s->chroma_qscale= s->qscale = get_bits(gb, s->quant_precision);
2059 av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (qscale=0)\n");
2060 return -1; // makes no sense to continue, as there is nothing left from the image then
2063 if (s->pict_type != AV_PICTURE_TYPE_I) {
2064 s->f_code = get_bits(gb, 3); /* fcode_for */
2066 av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (f_code=0)\n");
2067 return -1; // makes no sense to continue, as the MV decoding will break very quickly
2072 if (s->pict_type == AV_PICTURE_TYPE_B) {
2073 s->b_code = get_bits(gb, 3);
2077 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2078 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",
2079 s->qscale, s->f_code, s->b_code,
2080 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")),
2081 gb->size_in_bits,s->progressive_sequence, s->alternate_scan, s->top_field_first,
2082 s->quarter_sample ? "q" : "h", s->data_partitioning, s->resync_marker, s->num_sprite_warping_points,
2083 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);
2086 if(!s->scalability){
2087 if (s->shape!=RECT_SHAPE && s->pict_type!=AV_PICTURE_TYPE_I) {
2088 skip_bits1(gb); // vop shape coding type
2091 if(s->enhancement_type){
2092 int load_backward_shape= get_bits1(gb);
2093 if(load_backward_shape){
2094 av_log(s->avctx, AV_LOG_ERROR, "load backward shape isn't supported\n");
2097 skip_bits(gb, 2); //ref_select_code
2100 /* detect buggy encoders which don't set the low_delay flag (divx4/xvid/opendivx)*/
2101 // note we cannot detect divx5 without b-frames easily (although it's buggy too)
2102 if(s->vo_type==0 && s->vol_control_parameters==0 && s->divx_version==-1 && s->picture_number==0){
2103 av_log(s->avctx, AV_LOG_WARNING, "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2107 s->picture_number++; // better than pic number==0 always ;)
2109 s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table; //FIXME add short header support
2110 s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
2112 if(s->workaround_bugs&FF_BUG_EDGE){
2113 s->h_edge_pos= s->width;
2114 s->v_edge_pos= s->height;
2120 * decode mpeg4 headers
2121 * @return <0 if no VOP found (or a damaged one)
2122 * FRAME_SKIPPED if a not coded VOP is found
2123 * 0 if a VOP is found
2125 int ff_mpeg4_decode_picture_header(MpegEncContext * s, GetBitContext *gb)
2129 /* search next start code */
2132 if(s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630){
2134 if(get_bits(gb, 8) == 0xF0)
2140 if(get_bits_count(gb) >= gb->size_in_bits){
2141 if(gb->size_in_bits==8 && (s->divx_version>=0 || s->xvid_build>=0)){
2142 av_log(s->avctx, AV_LOG_WARNING, "frame skip %d\n", gb->size_in_bits);
2143 return FRAME_SKIPPED; //divx bug
2145 return -1; //end of stream
2148 /* use the bits after the test */
2149 v = get_bits(gb, 8);
2150 startcode = ((startcode << 8) | v) & 0xffffffff;
2152 if((startcode&0xFFFFFF00) != 0x100)
2153 continue; //no startcode
2155 if(s->avctx->debug&FF_DEBUG_STARTCODE){
2156 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2157 if (startcode<=0x11F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2158 else if(startcode<=0x12F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2159 else if(startcode<=0x13F) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2160 else if(startcode<=0x15F) av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2161 else if(startcode<=0x1AF) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2162 else if(startcode==0x1B0) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2163 else if(startcode==0x1B1) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2164 else if(startcode==0x1B2) av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2165 else if(startcode==0x1B3) av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2166 else if(startcode==0x1B4) av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2167 else if(startcode==0x1B5) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2168 else if(startcode==0x1B6) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2169 else if(startcode==0x1B7) av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2170 else if(startcode==0x1B8) av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2171 else if(startcode==0x1B9) av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2172 else if(startcode==0x1BA) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2173 else if(startcode==0x1BB) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2174 else if(startcode==0x1BC) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2175 else if(startcode==0x1BD) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2176 else if(startcode==0x1BE) av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2177 else if(startcode==0x1BF) av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2178 else if(startcode==0x1C0) av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2179 else if(startcode==0x1C1) av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2180 else if(startcode==0x1C2) av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2181 else if(startcode==0x1C3) av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2182 else if(startcode<=0x1C5) av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2183 else if(startcode<=0x1FF) av_log(s->avctx, AV_LOG_DEBUG, "System start");
2184 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2187 if(startcode >= 0x120 && startcode <= 0x12F){
2188 if(decode_vol_header(s, gb) < 0)
2191 else if(startcode == USER_DATA_STARTCODE){
2192 decode_user_data(s, gb);
2194 else if(startcode == GOP_STARTCODE){
2195 mpeg4_decode_gop_header(s, gb);
2197 else if(startcode == VOS_STARTCODE){
2198 mpeg4_decode_profile_level(s, gb);
2200 else if(startcode == VOP_STARTCODE){
2208 if(s->flags& CODEC_FLAG_LOW_DELAY)
2210 s->avctx->has_b_frames= !s->low_delay;
2211 return decode_vop_header(s, gb);
2214 static av_cold int decode_init(AVCodecContext *avctx)
2216 MpegEncContext *s = avctx->priv_data;
2218 static int done = 0;
2225 if((ret=ff_h263_decode_init(avctx)) < 0)
2231 init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
2232 init_rl(&rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
2233 init_rl(&rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
2234 INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
2235 INIT_VLC_RL(rvlc_rl_inter, 1072);
2236 INIT_VLC_RL(rvlc_rl_intra, 1072);
2237 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2238 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2239 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2240 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2241 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2242 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2243 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2244 &sprite_trajectory_tab[0][1], 4, 2,
2245 &sprite_trajectory_tab[0][0], 4, 2, 128);
2246 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2247 &mb_type_b_tab[0][1], 2, 1,
2248 &mb_type_b_tab[0][0], 2, 1, 16);
2252 s->low_delay = 0; //default, might be overriden in the vol header during header parsing
2253 s->decode_mb= mpeg4_decode_mb;
2254 s->time_increment_bits = 4; /* default value for broken headers */
2255 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
2260 static const AVProfile mpeg4_video_profiles[] = {
2261 { FF_PROFILE_MPEG4_SIMPLE, "Simple Profile" },
2262 { FF_PROFILE_MPEG4_SIMPLE_SCALABLE, "Simple Scalable Profile" },
2263 { FF_PROFILE_MPEG4_CORE, "Core Profile" },
2264 { FF_PROFILE_MPEG4_MAIN, "Main Profile" },
2265 { FF_PROFILE_MPEG4_N_BIT, "N-bit Profile" },
2266 { FF_PROFILE_MPEG4_SCALABLE_TEXTURE, "Scalable Texture Profile" },
2267 { FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION, "Simple Face Animation Profile" },
2268 { FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE, "Basic Animated Texture Profile" },
2269 { FF_PROFILE_MPEG4_HYBRID, "Hybrid Profile" },
2270 { FF_PROFILE_MPEG4_ADVANCED_REAL_TIME, "Advanced Real Time Simple Profile" },
2271 { FF_PROFILE_MPEG4_CORE_SCALABLE, "Code Scalable Profile" },
2272 { FF_PROFILE_MPEG4_ADVANCED_CODING, "Advanced Coding Profile" },
2273 { FF_PROFILE_MPEG4_ADVANCED_CORE, "Advanced Core Profile" },
2274 { FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" },
2275 { FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" },
2276 { FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" },
2279 AVCodec ff_mpeg4_decoder = {
2281 .type = AVMEDIA_TYPE_VIDEO,
2282 .id = CODEC_ID_MPEG4,
2283 .priv_data_size = sizeof(MpegEncContext),
2284 .init = decode_init,
2285 .close = ff_h263_decode_end,
2286 .decode = ff_h263_decode_frame,
2287 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_FRAME_THREADS,
2288 .flush= ff_mpeg_flush,
2290 .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2291 .pix_fmts= ff_hwaccel_pixfmt_list_420,
2292 .profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
2293 .update_thread_context= ONLY_IF_THREADS_ENABLED(ff_mpeg_update_thread_context)
2297 #if CONFIG_MPEG4_VDPAU_DECODER
2298 AVCodec ff_mpeg4_vdpau_decoder = {
2299 .name = "mpeg4_vdpau",
2300 .type = AVMEDIA_TYPE_VIDEO,
2301 .id = CODEC_ID_MPEG4,
2302 .priv_data_size = sizeof(MpegEncContext),
2303 .init = decode_init,
2304 .close = ff_h263_decode_end,
2305 .decode = ff_h263_decode_frame,
2306 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_HWACCEL_VDPAU,
2307 .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2308 .pix_fmts= (const enum PixelFormat[]){PIX_FMT_VDPAU_MPEG4, PIX_FMT_NONE},