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 #define UNCHECKED_BITSTREAM_READER 1
25 #include "libavutil/opt.h"
26 #include "error_resilience.h"
28 #include "mpegvideo.h"
29 #include "mpeg4video.h"
33 // The defines below define the number of bits that are read at once for
34 // reading vlc values. Changing these may improve speed and data cache needs
35 // be aware though that decreasing them may need the number of stages that is
36 // passed to get_vlc* to be increased.
37 #define SPRITE_TRAJ_VLC_BITS 6
39 #define MB_TYPE_B_VLC_BITS 4
42 static VLC dc_lum, dc_chrom;
43 static VLC sprite_trajectory;
44 static VLC mb_type_b_vlc;
46 static const int mb_type_b_map[4]= {
47 MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
48 MB_TYPE_L0L1 | MB_TYPE_16x16,
49 MB_TYPE_L1 | MB_TYPE_16x16,
50 MB_TYPE_L0 | MB_TYPE_16x16,
55 * @param n block index (0-3 are luma, 4-5 are chroma)
56 * @param dir the ac prediction direction
58 void ff_mpeg4_pred_ac(MpegEncContext * s, int16_t *block, int n,
62 int16_t *ac_val, *ac_val1;
63 int8_t * const qscale_table = s->current_picture.qscale_table;
66 ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
70 const int xy= s->mb_x-1 + s->mb_y*s->mb_stride;
74 if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){
77 block[s->dsp.idct_permutation[i<<3]] += ac_val[i];
80 /* different qscale, we must rescale */
82 block[s->dsp.idct_permutation[i<<3]] += ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale);
86 const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride;
88 ac_val -= 16 * s->block_wrap[n];
90 if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
93 block[s->dsp.idct_permutation[i]] += ac_val[i + 8];
96 /* different qscale, we must rescale */
98 block[s->dsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale);
105 ac_val1[i ] = block[s->dsp.idct_permutation[i<<3]];
109 ac_val1[8 + i] = block[s->dsp.idct_permutation[i ]];
114 * check if the next stuff is a resync marker or the end.
117 static inline int mpeg4_is_resync(MpegEncContext *s){
118 int bits_count= get_bits_count(&s->gb);
119 int v= show_bits(&s->gb, 16);
121 if(s->workaround_bugs&FF_BUG_NO_PADDING && !s->resync_marker){
126 if(s->pict_type==AV_PICTURE_TYPE_B || (v>>(8-s->pict_type)!=1) || s->partitioned_frame)
128 skip_bits(&s->gb, 8+s->pict_type);
129 bits_count+= 8+s->pict_type;
130 v= show_bits(&s->gb, 16);
133 if(bits_count + 8 >= s->gb.size_in_bits){
135 v|= 0x7F >> (7-(bits_count&7));
140 if(v == ff_mpeg4_resync_prefix[bits_count&7]){
142 int mb_num_bits= av_log2(s->mb_num - 1) + 1;
143 GetBitContext gb= s->gb;
145 skip_bits(&s->gb, 1);
146 align_get_bits(&s->gb);
148 for(len=0; len<32; len++){
149 if(get_bits1(&s->gb)) break;
152 mb_num= get_bits(&s->gb, mb_num_bits);
153 if(!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
158 if(len>=ff_mpeg4_get_video_packet_prefix_length(s))
165 static int mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb)
168 int a= 2<<s->sprite_warping_accuracy;
169 int rho= 3-s->sprite_warping_accuracy;
171 const int vop_ref[4][2]= {{0,0}, {s->width,0}, {0, s->height}, {s->width, s->height}}; // only true for rectangle shapes
172 int d[4][2]={{0,0}, {0,0}, {0,0}, {0,0}};
173 int sprite_ref[4][2];
174 int virtual_ref[2][2];
184 for(i=0; i<s->num_sprite_warping_points; i++){
188 length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
190 x= get_xbits(gb, length);
192 if(!(s->divx_version==500 && s->divx_build==413)) skip_bits1(gb); /* marker bit */
194 length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
196 y=get_xbits(gb, length);
198 skip_bits1(gb); /* marker bit */
199 s->sprite_traj[i][0]= d[i][0]= x;
200 s->sprite_traj[i][1]= d[i][1]= y;
203 s->sprite_traj[i][0]= s->sprite_traj[i][1]= 0;
205 while((1<<alpha)<w) alpha++;
206 while((1<<beta )<h) beta++; // there seems to be a typo in the mpeg4 std for the definition of w' and h'
210 // Note, the 4th point isn't used for GMC
211 if(s->divx_version==500 && s->divx_build==413){
212 sprite_ref[0][0]= a*vop_ref[0][0] + d[0][0];
213 sprite_ref[0][1]= a*vop_ref[0][1] + d[0][1];
214 sprite_ref[1][0]= a*vop_ref[1][0] + d[0][0] + d[1][0];
215 sprite_ref[1][1]= a*vop_ref[1][1] + d[0][1] + d[1][1];
216 sprite_ref[2][0]= a*vop_ref[2][0] + d[0][0] + d[2][0];
217 sprite_ref[2][1]= a*vop_ref[2][1] + d[0][1] + d[2][1];
219 sprite_ref[0][0]= (a>>1)*(2*vop_ref[0][0] + d[0][0]);
220 sprite_ref[0][1]= (a>>1)*(2*vop_ref[0][1] + d[0][1]);
221 sprite_ref[1][0]= (a>>1)*(2*vop_ref[1][0] + d[0][0] + d[1][0]);
222 sprite_ref[1][1]= (a>>1)*(2*vop_ref[1][1] + d[0][1] + d[1][1]);
223 sprite_ref[2][0]= (a>>1)*(2*vop_ref[2][0] + d[0][0] + d[2][0]);
224 sprite_ref[2][1]= (a>>1)*(2*vop_ref[2][1] + d[0][1] + d[2][1]);
226 /* sprite_ref[3][0]= (a>>1)*(2*vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
227 sprite_ref[3][1]= (a>>1)*(2*vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
229 // this is mostly identical to the mpeg4 std (and is totally unreadable because of that ...)
230 // perhaps it should be reordered to be more readable ...
231 // the idea behind this virtual_ref mess is to be able to use shifts later per pixel instead of divides
232 // so the distance between points is converted from w&h based to w2&h2 based which are of the 2^x form
233 virtual_ref[0][0]= 16*(vop_ref[0][0] + w2)
234 + 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);
235 virtual_ref[0][1]= 16*vop_ref[0][1]
236 + 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);
237 virtual_ref[1][0]= 16*vop_ref[0][0]
238 + 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);
239 virtual_ref[1][1]= 16*(vop_ref[0][1] + h2)
240 + 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);
242 switch(s->num_sprite_warping_points)
245 s->sprite_offset[0][0]= 0;
246 s->sprite_offset[0][1]= 0;
247 s->sprite_offset[1][0]= 0;
248 s->sprite_offset[1][1]= 0;
249 s->sprite_delta[0][0]= a;
250 s->sprite_delta[0][1]= 0;
251 s->sprite_delta[1][0]= 0;
252 s->sprite_delta[1][1]= a;
253 s->sprite_shift[0]= 0;
254 s->sprite_shift[1]= 0;
257 s->sprite_offset[0][0]= sprite_ref[0][0] - a*vop_ref[0][0];
258 s->sprite_offset[0][1]= sprite_ref[0][1] - a*vop_ref[0][1];
259 s->sprite_offset[1][0]= ((sprite_ref[0][0]>>1)|(sprite_ref[0][0]&1)) - a*(vop_ref[0][0]/2);
260 s->sprite_offset[1][1]= ((sprite_ref[0][1]>>1)|(sprite_ref[0][1]&1)) - a*(vop_ref[0][1]/2);
261 s->sprite_delta[0][0]= a;
262 s->sprite_delta[0][1]= 0;
263 s->sprite_delta[1][0]= 0;
264 s->sprite_delta[1][1]= a;
265 s->sprite_shift[0]= 0;
266 s->sprite_shift[1]= 0;
269 s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+rho))
270 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][0])
271 + ( r*sprite_ref[0][1] - virtual_ref[0][1])*(-vop_ref[0][1])
272 + (1<<(alpha+rho-1));
273 s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+rho))
274 + (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-vop_ref[0][0])
275 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][1])
276 + (1<<(alpha+rho-1));
277 s->sprite_offset[1][0]= ( (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][0] + 1)
278 +( r*sprite_ref[0][1] - virtual_ref[0][1])*(-2*vop_ref[0][1] + 1)
279 +2*w2*r*sprite_ref[0][0]
281 + (1<<(alpha+rho+1)));
282 s->sprite_offset[1][1]= ( (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-2*vop_ref[0][0] + 1)
283 +(-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][1] + 1)
284 +2*w2*r*sprite_ref[0][1]
286 + (1<<(alpha+rho+1)));
287 s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
288 s->sprite_delta[0][1]= (+r*sprite_ref[0][1] - virtual_ref[0][1]);
289 s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1]);
290 s->sprite_delta[1][1]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
292 s->sprite_shift[0]= alpha+rho;
293 s->sprite_shift[1]= alpha+rho+2;
296 min_ab= FFMIN(alpha, beta);
299 s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+beta+rho-min_ab))
300 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-vop_ref[0][0])
301 + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-vop_ref[0][1])
302 + (1<<(alpha+beta+rho-min_ab-1));
303 s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+beta+rho-min_ab))
304 + (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-vop_ref[0][0])
305 + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-vop_ref[0][1])
306 + (1<<(alpha+beta+rho-min_ab-1));
307 s->sprite_offset[1][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-2*vop_ref[0][0] + 1)
308 + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-2*vop_ref[0][1] + 1)
309 + 2*w2*h3*r*sprite_ref[0][0]
311 + (1<<(alpha+beta+rho-min_ab+1));
312 s->sprite_offset[1][1]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-2*vop_ref[0][0] + 1)
313 + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-2*vop_ref[0][1] + 1)
314 + 2*w2*h3*r*sprite_ref[0][1]
316 + (1<<(alpha+beta+rho-min_ab+1));
317 s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3;
318 s->sprite_delta[0][1]= (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3;
319 s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3;
320 s->sprite_delta[1][1]= (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3;
322 s->sprite_shift[0]= alpha + beta + rho - min_ab;
323 s->sprite_shift[1]= alpha + beta + rho - min_ab + 2;
326 /* try to simplify the situation */
327 if( s->sprite_delta[0][0] == a<<s->sprite_shift[0]
328 && s->sprite_delta[0][1] == 0
329 && s->sprite_delta[1][0] == 0
330 && s->sprite_delta[1][1] == a<<s->sprite_shift[0])
332 s->sprite_offset[0][0]>>=s->sprite_shift[0];
333 s->sprite_offset[0][1]>>=s->sprite_shift[0];
334 s->sprite_offset[1][0]>>=s->sprite_shift[1];
335 s->sprite_offset[1][1]>>=s->sprite_shift[1];
336 s->sprite_delta[0][0]= a;
337 s->sprite_delta[0][1]= 0;
338 s->sprite_delta[1][0]= 0;
339 s->sprite_delta[1][1]= a;
340 s->sprite_shift[0]= 0;
341 s->sprite_shift[1]= 0;
342 s->real_sprite_warping_points=1;
345 int shift_y= 16 - s->sprite_shift[0];
346 int shift_c= 16 - s->sprite_shift[1];
348 s->sprite_offset[0][i]<<= shift_y;
349 s->sprite_offset[1][i]<<= shift_c;
350 s->sprite_delta[0][i]<<= shift_y;
351 s->sprite_delta[1][i]<<= shift_y;
352 s->sprite_shift[i]= 16;
354 s->real_sprite_warping_points= s->num_sprite_warping_points;
360 * Decode the next video packet.
361 * @return <0 if something went wrong
363 int ff_mpeg4_decode_video_packet_header(MpegEncContext *s)
365 int mb_num_bits= av_log2(s->mb_num - 1) + 1;
366 int header_extension=0, mb_num, len;
368 /* is there enough space left for a video packet + header */
369 if( get_bits_count(&s->gb) > s->gb.size_in_bits-20) return -1;
371 for(len=0; len<32; len++){
372 if(get_bits1(&s->gb)) break;
375 if(len!=ff_mpeg4_get_video_packet_prefix_length(s)){
376 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
380 if(s->shape != RECT_SHAPE){
381 header_extension= get_bits1(&s->gb);
382 //FIXME more stuff here
385 mb_num= get_bits(&s->gb, mb_num_bits);
386 if(mb_num>=s->mb_num){
387 av_log(s->avctx, AV_LOG_ERROR, "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
391 s->mb_x= mb_num % s->mb_width;
392 s->mb_y= mb_num / s->mb_width;
394 if(s->shape != BIN_ONLY_SHAPE){
395 int qscale= get_bits(&s->gb, s->quant_precision);
397 s->chroma_qscale=s->qscale= qscale;
400 if(s->shape == RECT_SHAPE){
401 header_extension= get_bits1(&s->gb);
403 if(header_extension){
406 while (get_bits1(&s->gb) != 0)
409 check_marker(&s->gb, "before time_increment in video packed header");
410 skip_bits(&s->gb, s->time_increment_bits); /* time_increment */
411 check_marker(&s->gb, "before vop_coding_type in video packed header");
413 skip_bits(&s->gb, 2); /* vop coding type */
414 //FIXME not rect stuff here
416 if(s->shape != BIN_ONLY_SHAPE){
417 skip_bits(&s->gb, 3); /* intra dc vlc threshold */
418 //FIXME don't just ignore everything
419 if(s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
420 if(mpeg4_decode_sprite_trajectory(s, &s->gb) < 0)
422 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
425 //FIXME reduced res stuff here
427 if (s->pict_type != AV_PICTURE_TYPE_I) {
428 int f_code = get_bits(&s->gb, 3); /* fcode_for */
430 av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (f_code=0)\n");
433 if (s->pict_type == AV_PICTURE_TYPE_B) {
434 int b_code = get_bits(&s->gb, 3);
436 av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (b_code=0)\n");
441 //FIXME new-pred stuff
447 * Get the average motion vector for a GMC MB.
448 * @param n either 0 for the x component or 1 for y
449 * @return the average MV for a GMC MB
451 static inline int get_amv(MpegEncContext *s, int n){
452 int x, y, mb_v, sum, dx, dy, shift;
453 int len = 1 << (s->f_code + 4);
454 const int a= s->sprite_warping_accuracy;
456 if(s->workaround_bugs & FF_BUG_AMV)
457 len >>= s->quarter_sample;
459 if(s->real_sprite_warping_points==1){
460 if(s->divx_version==500 && s->divx_build==413)
461 sum= s->sprite_offset[0][n] / (1<<(a - s->quarter_sample));
463 sum= RSHIFT(s->sprite_offset[0][n]<<s->quarter_sample, a);
465 dx= s->sprite_delta[n][0];
466 dy= s->sprite_delta[n][1];
467 shift= s->sprite_shift[0];
468 if(n) dy -= 1<<(shift + a + 1);
469 else dx -= 1<<(shift + a + 1);
470 mb_v= s->sprite_offset[0][n] + dx*s->mb_x*16 + dy*s->mb_y*16;
483 sum= RSHIFT(sum, a+8-s->quarter_sample);
486 if (sum < -len) sum= -len;
487 else if (sum >= len) sum= len-1;
493 * Decode the dc value.
494 * @param n block index (0-3 are luma, 4-5 are chroma)
495 * @param dir_ptr the prediction direction will be stored here
496 * @return the quantized dc
498 static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
503 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
505 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
506 if (code < 0 || code > 9 /* && s->nbit<9 */){
507 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
515 level= 2*get_bits1(&s->gb)-1;
517 if(get_bits1(&s->gb))
518 level = get_bits(&s->gb, code-1) + (1<<(code-1));
520 level = -get_bits(&s->gb, code-1) - (1<<(code-1));
523 level = get_xbits(&s->gb, code);
527 if(get_bits1(&s->gb)==0){ /* marker */
528 if(s->err_recognition&(AV_EF_BITSTREAM|AV_EF_COMPLIANT)){
529 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
536 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
540 * Decode first partition.
541 * @return number of MBs decoded or <0 if an error occurred
543 static int mpeg4_decode_partition_a(MpegEncContext *s){
545 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
547 /* decode first partition */
549 s->first_slice_line=1;
550 for(; s->mb_y<s->mb_height; s->mb_y++){
551 ff_init_block_index(s);
552 for(; s->mb_x<s->mb_width; s->mb_x++){
553 const int xy= s->mb_x + s->mb_y*s->mb_stride;
558 ff_update_block_index(s);
559 if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
560 s->first_slice_line=0;
562 if(s->pict_type==AV_PICTURE_TYPE_I){
566 if(show_bits_long(&s->gb, 19)==DC_MARKER){
570 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
572 av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
577 s->cbp_table[xy]= cbpc & 3;
578 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
582 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
584 s->current_picture.qscale_table[xy]= s->qscale;
586 s->mbintra_table[xy]= 1;
589 int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
591 av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
595 if(dc_pred_dir) dir|=1;
597 s->pred_dir_table[xy]= dir;
598 }else{ /* P/S_TYPE */
599 int mx, my, pred_x, pred_y, bits;
600 int16_t * const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
601 const int stride= s->b8_stride*2;
604 bits= show_bits(&s->gb, 17);
605 if(bits==MOTION_MARKER){
611 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
612 s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
616 s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
619 mot_val[0 ]= mot_val[2 ]=
620 mot_val[0+stride]= mot_val[2+stride]= mx;
621 mot_val[1 ]= mot_val[3 ]=
622 mot_val[1+stride]= mot_val[3+stride]= my;
624 if(s->mbintra_table[xy])
625 ff_clean_intra_table_entries(s);
629 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
631 av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
637 s->cbp_table[xy]= cbpc&(8+3); //8 is dquant
639 s->mb_intra = ((cbpc & 4) != 0);
642 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
643 s->mbintra_table[xy]= 1;
644 mot_val[0 ]= mot_val[2 ]=
645 mot_val[0+stride]= mot_val[2+stride]= 0;
646 mot_val[1 ]= mot_val[3 ]=
647 mot_val[1+stride]= mot_val[3+stride]= 0;
649 if(s->mbintra_table[xy])
650 ff_clean_intra_table_entries(s);
652 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
653 s->mcsel= get_bits1(&s->gb);
656 if ((cbpc & 16) == 0) {
657 /* 16x16 motion prediction */
659 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
661 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
665 my = ff_h263_decode_motion(s, pred_y, s->f_code);
668 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
672 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
675 mot_val[0 ]= mot_val[2 ] =
676 mot_val[0+stride]= mot_val[2+stride]= mx;
677 mot_val[1 ]= mot_val[3 ]=
678 mot_val[1+stride]= mot_val[3+stride]= my;
681 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
683 int16_t *mot_val= ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
684 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
688 my = ff_h263_decode_motion(s, pred_y, s->f_code);
705 * decode second partition.
706 * @return <0 if an error occurred
708 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count){
710 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
712 s->mb_x= s->resync_mb_x;
713 s->first_slice_line=1;
714 for(s->mb_y= s->resync_mb_y; mb_num < mb_count; s->mb_y++){
715 ff_init_block_index(s);
716 for(; mb_num < mb_count && s->mb_x<s->mb_width; s->mb_x++){
717 const int xy= s->mb_x + s->mb_y*s->mb_stride;
720 ff_update_block_index(s);
721 if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
722 s->first_slice_line=0;
724 if(s->pict_type==AV_PICTURE_TYPE_I){
725 int ac_pred= get_bits1(&s->gb);
726 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
728 av_log(s->avctx, AV_LOG_ERROR, "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
732 s->cbp_table[xy]|= cbpy<<2;
733 s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
734 }else{ /* P || S_TYPE */
735 if (IS_INTRA(s->current_picture.mb_type[xy])) {
737 int ac_pred = get_bits1(&s->gb);
738 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
741 av_log(s->avctx, AV_LOG_ERROR, "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
745 if(s->cbp_table[xy] & 8) {
746 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
748 s->current_picture.qscale_table[xy] = s->qscale;
752 int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
754 av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
758 if(dc_pred_dir) dir|=1;
760 s->cbp_table[xy]&= 3; //remove dquant
761 s->cbp_table[xy]|= cbpy<<2;
762 s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
763 s->pred_dir_table[xy]= dir;
764 } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
765 s->current_picture.qscale_table[xy] = s->qscale;
768 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
771 av_log(s->avctx, AV_LOG_ERROR, "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
775 if(s->cbp_table[xy] & 8) {
776 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
778 s->current_picture.qscale_table[xy] = s->qscale;
780 s->cbp_table[xy]&= 3; //remove dquant
781 s->cbp_table[xy]|= (cbpy^0xf)<<2;
785 if(mb_num >= mb_count) return 0;
792 * Decode the first and second partition.
793 * @return <0 if error (and sets error type in the error_status_table)
795 int ff_mpeg4_decode_partitions(MpegEncContext *s)
798 const int part_a_error= s->pict_type==AV_PICTURE_TYPE_I ? (ER_DC_ERROR|ER_MV_ERROR) : ER_MV_ERROR;
799 const int part_a_end = s->pict_type==AV_PICTURE_TYPE_I ? (ER_DC_END |ER_MV_END) : ER_MV_END;
801 mb_num= mpeg4_decode_partition_a(s);
803 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
807 if(s->resync_mb_x + s->resync_mb_y*s->mb_width + mb_num > s->mb_num){
808 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
809 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
813 s->mb_num_left= mb_num;
815 if(s->pict_type==AV_PICTURE_TYPE_I){
816 while(show_bits(&s->gb, 9) == 1)
817 skip_bits(&s->gb, 9);
818 if(get_bits_long(&s->gb, 19)!=DC_MARKER){
819 av_log(s->avctx, AV_LOG_ERROR, "marker missing after first I partition at %d %d\n", s->mb_x, s->mb_y);
823 while(show_bits(&s->gb, 10) == 1)
824 skip_bits(&s->gb, 10);
825 if(get_bits(&s->gb, 17)!=MOTION_MARKER){
826 av_log(s->avctx, AV_LOG_ERROR, "marker missing after first P partition at %d %d\n", s->mb_x, s->mb_y);
830 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, part_a_end);
832 if( mpeg4_decode_partition_b(s, mb_num) < 0){
833 if(s->pict_type==AV_PICTURE_TYPE_P)
834 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_DC_ERROR);
837 if(s->pict_type==AV_PICTURE_TYPE_P)
838 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_DC_END);
846 * @return <0 if an error occurred
848 static inline int mpeg4_decode_block(MpegEncContext * s, int16_t * block,
849 int n, int coded, int intra, int rvlc)
851 int level, i, last, run;
852 int av_uninit(dc_pred_dir);
854 RL_VLC_ELEM * rl_vlc;
855 const uint8_t * scan_table;
858 //Note intra & rvlc should be optimized away if this is inlined
861 if(s->use_intra_dc_vlc){
863 if(s->partitioned_frame){
864 level = s->dc_val[0][ s->block_index[n] ];
865 if(n<4) level= FASTDIV((level + (s->y_dc_scale>>1)), s->y_dc_scale);
866 else level= FASTDIV((level + (s->c_dc_scale>>1)), s->c_dc_scale);
867 dc_pred_dir= (s->pred_dir_table[s->mb_x + s->mb_y*s->mb_stride]<<n)&32;
869 level = mpeg4_decode_dc(s, n, &dc_pred_dir);
877 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
883 rl = &ff_rvlc_rl_intra;
884 rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
886 rl = &ff_mpeg4_rl_intra;
887 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
890 if (dc_pred_dir == 0)
891 scan_table = s->intra_v_scantable.permutated; /* left */
893 scan_table = s->intra_h_scantable.permutated; /* top */
895 scan_table = s->intra_scantable.permutated;
902 s->block_last_index[n] = i;
905 if(rvlc) rl = &ff_rvlc_rl_inter;
906 else rl = &ff_h263_rl_inter;
908 scan_table = s->intra_scantable.permutated;
914 rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
916 rl_vlc = ff_h263_rl_inter.rl_vlc[0];
919 qmul = s->qscale << 1;
920 qadd = (s->qscale - 1) | 1;
922 rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
924 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
929 OPEN_READER(re, &s->gb);
931 UPDATE_CACHE(re, &s->gb);
932 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
936 if(SHOW_UBITS(re, &s->gb, 1)==0){
937 av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in rvlc esc\n");
939 }; SKIP_CACHE(re, &s->gb, 1);
941 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
942 run= SHOW_UBITS(re, &s->gb, 6);
943 SKIP_COUNTER(re, &s->gb, 1+1+6);
944 UPDATE_CACHE(re, &s->gb);
946 if(SHOW_UBITS(re, &s->gb, 1)==0){
947 av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in rvlc esc\n");
949 }; SKIP_CACHE(re, &s->gb, 1);
951 level= SHOW_UBITS(re, &s->gb, 11); SKIP_CACHE(re, &s->gb, 11);
953 if(SHOW_UBITS(re, &s->gb, 5)!=0x10){
954 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
956 }; SKIP_CACHE(re, &s->gb, 5);
958 level= level * qmul + qadd;
959 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
960 SKIP_COUNTER(re, &s->gb, 1+11+5+1);
966 cache= GET_CACHE(re, &s->gb);
971 if (cache&0x80000000) {
972 if (cache&0x40000000) {
974 SKIP_CACHE(re, &s->gb, 2);
975 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
976 run= SHOW_UBITS(re, &s->gb, 6);
977 SKIP_COUNTER(re, &s->gb, 2+1+6);
978 UPDATE_CACHE(re, &s->gb);
981 level= SHOW_SBITS(re, &s->gb, 12); LAST_SKIP_BITS(re, &s->gb, 12);
983 if(SHOW_UBITS(re, &s->gb, 1)==0){
984 av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in 3. esc\n");
986 }; SKIP_CACHE(re, &s->gb, 1);
988 level= SHOW_SBITS(re, &s->gb, 12); SKIP_CACHE(re, &s->gb, 12);
990 if(SHOW_UBITS(re, &s->gb, 1)==0){
991 av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in 3. esc\n");
995 SKIP_COUNTER(re, &s->gb, 1+12+1);
999 if(s->error_recognition >= FF_ER_COMPLIANT){
1000 const int abs_level= FFABS(level);
1001 if(abs_level<=MAX_LEVEL && run<=MAX_RUN){
1002 const int run1= run - rl->max_run[last][abs_level] - 1;
1003 if(abs_level <= rl->max_level[last][run]){
1004 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1007 if(s->error_recognition > FF_ER_COMPLIANT){
1008 if(abs_level <= rl->max_level[last][run]*2){
1009 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1012 if(run1 >= 0 && abs_level <= rl->max_level[last][run1]){
1013 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1020 if (level>0) level= level * qmul + qadd;
1021 else level= level * qmul - qadd;
1023 if((unsigned)(level + 2048) > 4095){
1024 if(s->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)){
1025 if(level > 2560 || level<-2560){
1026 av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc, qp=%d\n", s->qscale);
1030 level= level<0 ? -2048 : 2047;
1037 SKIP_BITS(re, &s->gb, 2);
1038 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1039 i+= run + rl->max_run[run>>7][level/qmul] +1; //FIXME opt indexing
1040 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1041 LAST_SKIP_BITS(re, &s->gb, 1);
1045 SKIP_BITS(re, &s->gb, 1);
1046 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1048 level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
1049 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1050 LAST_SKIP_BITS(re, &s->gb, 1);
1055 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1056 LAST_SKIP_BITS(re, &s->gb, 1);
1061 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1065 block[scan_table[i]] = level;
1069 block[scan_table[i]] = level;
1071 CLOSE_READER(re, &s->gb);
1075 if(!s->use_intra_dc_vlc){
1076 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1078 i -= i>>31; //if(i == -1) i=0;
1081 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1083 i = 63; /* XXX: not optimal */
1086 s->block_last_index[n] = i;
1091 * decode partition C of one MB.
1092 * @return <0 if an error occurred
1094 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1097 const int xy= s->mb_x + s->mb_y*s->mb_stride;
1099 mb_type = s->current_picture.mb_type[xy];
1100 cbp = s->cbp_table[xy];
1102 s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
1104 if (s->current_picture.qscale_table[xy] != s->qscale) {
1105 ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1108 if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type==AV_PICTURE_TYPE_S) {
1111 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1112 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1114 s->mb_intra = IS_INTRA(mb_type);
1116 if (IS_SKIP(mb_type)) {
1119 s->block_last_index[i] = -1;
1120 s->mv_dir = MV_DIR_FORWARD;
1121 s->mv_type = MV_TYPE_16X16;
1122 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
1129 }else if(s->mb_intra){
1130 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1131 }else if(!s->mb_intra){
1132 // s->mcsel= 0; //FIXME do we need to init that
1134 s->mv_dir = MV_DIR_FORWARD;
1135 if (IS_8X8(mb_type)) {
1136 s->mv_type = MV_TYPE_8X8;
1138 s->mv_type = MV_TYPE_16X16;
1141 } else { /* I-Frame */
1143 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1146 if (!IS_SKIP(mb_type)) {
1148 s->dsp.clear_blocks(s->block[0]);
1149 /* decode each block */
1150 for (i = 0; i < 6; i++) {
1151 if(mpeg4_decode_block(s, block[i], i, cbp&32, s->mb_intra, s->rvlc) < 0){
1152 av_log(s->avctx, AV_LOG_ERROR, "texture corrupted at %d %d %d\n", s->mb_x, s->mb_y, s->mb_intra);
1159 /* per-MB end of slice check */
1161 if(--s->mb_num_left <= 0){
1162 if(mpeg4_is_resync(s))
1167 if(mpeg4_is_resync(s)){
1168 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1169 if(s->cbp_table[xy+delta])
1176 static int mpeg4_decode_mb(MpegEncContext *s,
1177 int16_t block[6][64])
1179 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1181 static int8_t quant_tab[4] = { -1, -2, 1, 2 };
1182 const int xy= s->mb_x + s->mb_y * s->mb_stride;
1184 av_assert2(s->h263_pred);
1186 if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type==AV_PICTURE_TYPE_S) {
1188 if (get_bits1(&s->gb)) {
1192 s->block_last_index[i] = -1;
1193 s->mv_dir = MV_DIR_FORWARD;
1194 s->mv_type = MV_TYPE_16X16;
1195 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
1196 s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
1198 s->mv[0][0][0]= get_amv(s, 0);
1199 s->mv[0][0][1]= get_amv(s, 1);
1203 s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
1211 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1213 av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1218 s->dsp.clear_blocks(s->block[0]);
1220 s->mb_intra = ((cbpc & 4) != 0);
1221 if (s->mb_intra) goto intra;
1223 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
1224 s->mcsel= get_bits1(&s->gb);
1226 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1228 cbp = (cbpc & 3) | (cbpy << 2);
1230 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1232 if((!s->progressive_sequence) && (cbp || (s->workaround_bugs&FF_BUG_XVID_ILACE)))
1233 s->interlaced_dct= get_bits1(&s->gb);
1235 s->mv_dir = MV_DIR_FORWARD;
1236 if ((cbpc & 16) == 0) {
1238 s->current_picture.mb_type[xy] = MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
1239 /* 16x16 global motion prediction */
1240 s->mv_type = MV_TYPE_16X16;
1243 s->mv[0][0][0] = mx;
1244 s->mv[0][0][1] = my;
1245 }else if((!s->progressive_sequence) && get_bits1(&s->gb)){
1246 s->current_picture.mb_type[xy] = MB_TYPE_16x8 | MB_TYPE_L0 | MB_TYPE_INTERLACED;
1247 /* 16x8 field motion prediction */
1248 s->mv_type= MV_TYPE_FIELD;
1250 s->field_select[0][0]= get_bits1(&s->gb);
1251 s->field_select[0][1]= get_bits1(&s->gb);
1253 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1256 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1260 my = ff_h263_decode_motion(s, pred_y/2, s->f_code);
1264 s->mv[0][i][0] = mx;
1265 s->mv[0][i][1] = my;
1268 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1269 /* 16x16 motion prediction */
1270 s->mv_type = MV_TYPE_16X16;
1271 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1272 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1277 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1281 s->mv[0][0][0] = mx;
1282 s->mv[0][0][1] = my;
1285 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1286 s->mv_type = MV_TYPE_8X8;
1288 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1289 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1293 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1296 s->mv[0][i][0] = mx;
1297 s->mv[0][i][1] = my;
1302 } else if(s->pict_type==AV_PICTURE_TYPE_B) {
1303 int modb1; // first bit of modb
1304 int modb2; // second bit of modb
1307 s->mb_intra = 0; //B-frames never contain intra blocks
1308 s->mcsel=0; // ... true gmc blocks
1312 s->last_mv[i][0][0]=
1313 s->last_mv[i][0][1]=
1314 s->last_mv[i][1][0]=
1315 s->last_mv[i][1][1]= 0;
1318 ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1321 /* if we skipped it in the future P Frame than skip it now too */
1322 s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1327 s->block_last_index[i] = -1;
1329 s->mv_dir = MV_DIR_FORWARD;
1330 s->mv_type = MV_TYPE_16X16;
1335 s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
1339 modb1= get_bits1(&s->gb);
1341 mb_type= MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1; //like MB_TYPE_B_DIRECT but no vectors coded
1344 modb2= get_bits1(&s->gb);
1345 mb_type= get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1347 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1350 mb_type= mb_type_b_map[ mb_type ];
1353 s->dsp.clear_blocks(s->block[0]);
1354 cbp= get_bits(&s->gb, 6);
1357 if ((!IS_DIRECT(mb_type)) && cbp) {
1358 if(get_bits1(&s->gb)){
1359 ff_set_qscale(s, s->qscale + get_bits1(&s->gb)*4 - 2);
1363 if(!s->progressive_sequence){
1365 s->interlaced_dct= get_bits1(&s->gb);
1367 if(!IS_DIRECT(mb_type) && get_bits1(&s->gb)){
1368 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1369 mb_type &= ~MB_TYPE_16x16;
1371 if(USES_LIST(mb_type, 0)){
1372 s->field_select[0][0]= get_bits1(&s->gb);
1373 s->field_select[0][1]= get_bits1(&s->gb);
1375 if(USES_LIST(mb_type, 1)){
1376 s->field_select[1][0]= get_bits1(&s->gb);
1377 s->field_select[1][1]= get_bits1(&s->gb);
1383 if((mb_type & (MB_TYPE_DIRECT2|MB_TYPE_INTERLACED)) == 0){
1384 s->mv_type= MV_TYPE_16X16;
1386 if(USES_LIST(mb_type, 0)){
1387 s->mv_dir = MV_DIR_FORWARD;
1389 mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1390 my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1391 s->last_mv[0][1][0]= s->last_mv[0][0][0]= s->mv[0][0][0] = mx;
1392 s->last_mv[0][1][1]= s->last_mv[0][0][1]= s->mv[0][0][1] = my;
1395 if(USES_LIST(mb_type, 1)){
1396 s->mv_dir |= MV_DIR_BACKWARD;
1398 mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1399 my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1400 s->last_mv[1][1][0]= s->last_mv[1][0][0]= s->mv[1][0][0] = mx;
1401 s->last_mv[1][1][1]= s->last_mv[1][0][1]= s->mv[1][0][1] = my;
1403 }else if(!IS_DIRECT(mb_type)){
1404 s->mv_type= MV_TYPE_FIELD;
1406 if(USES_LIST(mb_type, 0)){
1407 s->mv_dir = MV_DIR_FORWARD;
1410 mx = ff_h263_decode_motion(s, s->last_mv[0][i][0] , s->f_code);
1411 my = ff_h263_decode_motion(s, s->last_mv[0][i][1]/2, s->f_code);
1412 s->last_mv[0][i][0]= s->mv[0][i][0] = mx;
1413 s->last_mv[0][i][1]= (s->mv[0][i][1] = my)*2;
1417 if(USES_LIST(mb_type, 1)){
1418 s->mv_dir |= MV_DIR_BACKWARD;
1421 mx = ff_h263_decode_motion(s, s->last_mv[1][i][0] , s->b_code);
1422 my = ff_h263_decode_motion(s, s->last_mv[1][i][1]/2, s->b_code);
1423 s->last_mv[1][i][0]= s->mv[1][i][0] = mx;
1424 s->last_mv[1][i][1]= (s->mv[1][i][1] = my)*2;
1430 if(IS_DIRECT(mb_type)){
1431 if(IS_SKIP(mb_type))
1434 mx = ff_h263_decode_motion(s, 0, 1);
1435 my = ff_h263_decode_motion(s, 0, 1);
1438 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1439 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1441 s->current_picture.mb_type[xy] = mb_type;
1442 } else { /* I-Frame */
1444 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1446 av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1454 s->ac_pred = get_bits1(&s->gb);
1456 s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1458 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1460 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1462 av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1465 cbp = (cbpc & 3) | (cbpy << 2);
1467 s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
1470 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1473 if(!s->progressive_sequence)
1474 s->interlaced_dct= get_bits1(&s->gb);
1476 s->dsp.clear_blocks(s->block[0]);
1477 /* decode each block */
1478 for (i = 0; i < 6; i++) {
1479 if (mpeg4_decode_block(s, block[i], i, cbp&32, 1, 0) < 0)
1486 /* decode each block */
1487 for (i = 0; i < 6; i++) {
1488 if (mpeg4_decode_block(s, block[i], i, cbp&32, 0, 0) < 0)
1494 /* per-MB end of slice check */
1495 if(s->codec_id==AV_CODEC_ID_MPEG4){
1496 int next= mpeg4_is_resync(s);
1498 if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1500 } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1503 if(s->pict_type==AV_PICTURE_TYPE_B){
1504 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1505 ff_thread_await_progress(&s->next_picture_ptr->tf,
1506 (s->mb_x + delta >= s->mb_width) ? FFMIN(s->mb_y+1, s->mb_height-1) : s->mb_y, 0);
1507 if (s->next_picture.mbskip_table[xy + delta])
1519 static int mpeg4_decode_gop_header(MpegEncContext * s, GetBitContext *gb){
1520 int hours, minutes, seconds;
1522 if(!show_bits(gb, 23)){
1523 av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1527 hours= get_bits(gb, 5);
1528 minutes= get_bits(gb, 6);
1530 seconds= get_bits(gb, 6);
1532 s->time_base= seconds + 60*(minutes + 60*hours);
1540 static int mpeg4_decode_profile_level(MpegEncContext * s, GetBitContext *gb){
1542 s->avctx->profile = get_bits(gb, 4);
1543 s->avctx->level = get_bits(gb, 4);
1545 // for Simple profile, level 0
1546 if (s->avctx->profile == 0 && s->avctx->level == 8) {
1547 s->avctx->level = 0;
1553 static int decode_vol_header(MpegEncContext *s, GetBitContext *gb){
1554 int width, height, vo_ver_id;
1557 skip_bits(gb, 1); /* random access */
1558 s->vo_type= get_bits(gb, 8);
1559 if (get_bits1(gb) != 0) { /* is_ol_id */
1560 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1561 skip_bits(gb, 3); /* vo_priority */
1565 s->aspect_ratio_info= get_bits(gb, 4);
1566 if(s->aspect_ratio_info == FF_ASPECT_EXTENDED){
1567 s->avctx->sample_aspect_ratio.num= get_bits(gb, 8); // par_width
1568 s->avctx->sample_aspect_ratio.den= get_bits(gb, 8); // par_height
1570 s->avctx->sample_aspect_ratio= ff_h263_pixel_aspect[s->aspect_ratio_info];
1573 if ((s->vol_control_parameters=get_bits1(gb))) { /* vol control parameter */
1574 int chroma_format= get_bits(gb, 2);
1575 if(chroma_format!=CHROMA_420){
1576 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1578 s->low_delay= get_bits1(gb);
1579 if(get_bits1(gb)){ /* vbv parameters */
1580 get_bits(gb, 15); /* first_half_bitrate */
1581 skip_bits1(gb); /* marker */
1582 get_bits(gb, 15); /* latter_half_bitrate */
1583 skip_bits1(gb); /* marker */
1584 get_bits(gb, 15); /* first_half_vbv_buffer_size */
1585 skip_bits1(gb); /* marker */
1586 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1587 get_bits(gb, 11); /* first_half_vbv_occupancy */
1588 skip_bits1(gb); /* marker */
1589 get_bits(gb, 15); /* latter_half_vbv_occupancy */
1590 skip_bits1(gb); /* marker */
1593 // set low delay flag only once the smartest? low delay detection won't be overridden
1594 if(s->picture_number==0)
1598 s->shape = get_bits(gb, 2); /* vol shape */
1599 if(s->shape != RECT_SHAPE) av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1600 if(s->shape == GRAY_SHAPE && vo_ver_id != 1){
1601 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1602 skip_bits(gb, 4); //video_object_layer_shape_extension
1605 check_marker(gb, "before time_increment_resolution");
1607 s->avctx->time_base.den = get_bits(gb, 16);
1608 if(!s->avctx->time_base.den){
1609 av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n");
1610 s->avctx->time_base.num = 0;
1614 s->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
1615 if (s->time_increment_bits < 1)
1616 s->time_increment_bits = 1;
1618 check_marker(gb, "before fixed_vop_rate");
1620 if (get_bits1(gb) != 0) { /* fixed_vop_rate */
1621 s->avctx->time_base.num = get_bits(gb, s->time_increment_bits);
1623 s->avctx->time_base.num = 1;
1627 if (s->shape != BIN_ONLY_SHAPE) {
1628 if (s->shape == RECT_SHAPE) {
1629 skip_bits1(gb); /* marker */
1630 width = get_bits(gb, 13);
1631 skip_bits1(gb); /* marker */
1632 height = get_bits(gb, 13);
1633 skip_bits1(gb); /* marker */
1634 if(width && height && !(s->width && s->codec_tag == AV_RL32("MP4S"))){ /* they should be non zero but who knows ... */
1635 if (s->width && s->height &&
1636 (s->width != width || s->height != height))
1637 s->context_reinit = 1;
1643 s->progressive_sequence=
1644 s->progressive_frame= get_bits1(gb)^1;
1645 s->interlaced_dct=0;
1646 if(!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1647 av_log(s->avctx, AV_LOG_INFO, "MPEG4 OBMC not supported (very likely buggy encoder)\n"); /* OBMC Disable */
1648 if (vo_ver_id == 1) {
1649 s->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1651 s->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1653 if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1654 if(s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE){
1655 if(s->vol_sprite_usage==STATIC_SPRITE){
1656 s->sprite_width = get_bits(gb, 13);
1657 skip_bits1(gb); /* marker */
1658 s->sprite_height= get_bits(gb, 13);
1659 skip_bits1(gb); /* marker */
1660 s->sprite_left = get_bits(gb, 13);
1661 skip_bits1(gb); /* marker */
1662 s->sprite_top = get_bits(gb, 13);
1663 skip_bits1(gb); /* marker */
1665 s->num_sprite_warping_points= get_bits(gb, 6);
1666 if(s->num_sprite_warping_points > 3){
1667 av_log(s->avctx, AV_LOG_ERROR, "%d sprite_warping_points\n", s->num_sprite_warping_points);
1668 s->num_sprite_warping_points= 0;
1671 s->sprite_warping_accuracy = get_bits(gb, 2);
1672 s->sprite_brightness_change= get_bits1(gb);
1673 if(s->vol_sprite_usage==STATIC_SPRITE)
1674 s->low_latency_sprite= get_bits1(gb);
1676 // FIXME sadct disable bit if verid!=1 && shape not rect
1678 if (get_bits1(gb) == 1) { /* not_8_bit */
1679 s->quant_precision = get_bits(gb, 4); /* quant_precision */
1680 if(get_bits(gb, 4)!=8) av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n"); /* bits_per_pixel */
1681 if(s->quant_precision!=5) av_log(s->avctx, AV_LOG_ERROR, "quant precision %d\n", s->quant_precision);
1682 if(s->quant_precision<3 || s->quant_precision>9) {
1683 s->quant_precision = 5;
1686 s->quant_precision = 5;
1689 // FIXME a bunch of grayscale shape things
1691 if((s->mpeg_quant=get_bits1(gb))){ /* vol_quant_type */
1694 /* load default matrixes */
1695 for(i=0; i<64; i++){
1696 int j= s->dsp.idct_permutation[i];
1697 v= ff_mpeg4_default_intra_matrix[i];
1698 s->intra_matrix[j]= v;
1699 s->chroma_intra_matrix[j]= v;
1701 v= ff_mpeg4_default_non_intra_matrix[i];
1702 s->inter_matrix[j]= v;
1703 s->chroma_inter_matrix[j]= v;
1706 /* load custom intra matrix */
1709 for(i=0; i<64; i++){
1715 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1716 s->intra_matrix[j]= v;
1717 s->chroma_intra_matrix[j]= v;
1720 /* replicate last value */
1722 int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1723 s->intra_matrix[j]= last;
1724 s->chroma_intra_matrix[j]= last;
1728 /* load custom non intra matrix */
1731 for(i=0; i<64; i++){
1737 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1738 s->inter_matrix[j]= v;
1739 s->chroma_inter_matrix[j]= v;
1742 /* replicate last value */
1744 int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1745 s->inter_matrix[j]= last;
1746 s->chroma_inter_matrix[j]= last;
1750 // FIXME a bunch of grayscale shape things
1754 s->quarter_sample= get_bits1(gb);
1755 else s->quarter_sample=0;
1758 int pos= get_bits_count(gb);
1759 int estimation_method= get_bits(gb, 2);
1760 if(estimation_method<2){
1762 s->cplx_estimation_trash_i += 8*get_bits1(gb); //opaque
1763 s->cplx_estimation_trash_i += 8*get_bits1(gb); //transparent
1764 s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_cae
1765 s->cplx_estimation_trash_i += 8*get_bits1(gb); //inter_cae
1766 s->cplx_estimation_trash_i += 8*get_bits1(gb); //no_update
1767 s->cplx_estimation_trash_i += 8*get_bits1(gb); //upampling
1770 s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_blocks
1771 s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter_blocks
1772 s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter4v_blocks
1773 s->cplx_estimation_trash_i += 8*get_bits1(gb); //not coded blocks
1775 if(!check_marker(gb, "in complexity estimation part 1")){
1776 skip_bits_long(gb, pos - get_bits_count(gb));
1780 s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_coeffs
1781 s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_lines
1782 s->cplx_estimation_trash_i += 8*get_bits1(gb); //vlc_syms
1783 s->cplx_estimation_trash_i += 4*get_bits1(gb); //vlc_bits
1786 s->cplx_estimation_trash_p += 8*get_bits1(gb); //apm
1787 s->cplx_estimation_trash_p += 8*get_bits1(gb); //npm
1788 s->cplx_estimation_trash_b += 8*get_bits1(gb); //interpolate_mc_q
1789 s->cplx_estimation_trash_p += 8*get_bits1(gb); //forwback_mc_q
1790 s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel2
1791 s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel4
1793 if(!check_marker(gb, "in complexity estimation part 2")){
1794 skip_bits_long(gb, pos - get_bits_count(gb));
1797 if(estimation_method==1){
1798 s->cplx_estimation_trash_i += 8*get_bits1(gb); //sadct
1799 s->cplx_estimation_trash_p += 8*get_bits1(gb); //qpel
1802 av_log(s->avctx, AV_LOG_ERROR, "Invalid Complexity estimation method %d\n", estimation_method);
1805 s->cplx_estimation_trash_i=
1806 s->cplx_estimation_trash_p=
1807 s->cplx_estimation_trash_b= 0;
1810 s->resync_marker= !get_bits1(gb); /* resync_marker_disabled */
1812 s->data_partitioning= get_bits1(gb);
1813 if(s->data_partitioning){
1814 s->rvlc= get_bits1(gb);
1817 if(vo_ver_id != 1) {
1818 s->new_pred= get_bits1(gb);
1820 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
1821 skip_bits(gb, 2); /* requested upstream message type */
1822 skip_bits1(gb); /* newpred segment type */
1824 s->reduced_res_vop= get_bits1(gb);
1825 if(s->reduced_res_vop) av_log(s->avctx, AV_LOG_ERROR, "reduced resolution VOP not supported\n");
1829 s->reduced_res_vop= 0;
1832 s->scalability= get_bits1(gb);
1834 if (s->scalability) {
1835 GetBitContext bak= *gb;
1836 int h_sampling_factor_n;
1837 int h_sampling_factor_m;
1838 int v_sampling_factor_n;
1839 int v_sampling_factor_m;
1841 s->hierachy_type= get_bits1(gb);
1842 skip_bits(gb, 4); /* ref_layer_id */
1843 skip_bits1(gb); /* ref_layer_sampling_dir */
1844 h_sampling_factor_n= get_bits(gb, 5);
1845 h_sampling_factor_m= get_bits(gb, 5);
1846 v_sampling_factor_n= get_bits(gb, 5);
1847 v_sampling_factor_m= get_bits(gb, 5);
1848 s->enhancement_type= get_bits1(gb);
1850 if( h_sampling_factor_n==0 || h_sampling_factor_m==0
1851 || v_sampling_factor_n==0 || v_sampling_factor_m==0){
1852 /* illegal scalability header (VERY broken encoder),
1853 * trying to workaround */
1857 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
1859 // bin shape stuff FIXME
1863 if(s->avctx->debug&FF_DEBUG_PICT_INFO) {
1864 av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, %s%s%s%s\n",
1865 s->avctx->time_base.num, s->avctx->time_base.den,
1866 s->time_increment_bits,
1868 s->progressive_sequence,
1869 s->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
1870 s->data_partitioning ? "partition " : "", s->rvlc ? "rvlc " : ""
1878 * Decode the user data stuff in the header.
1879 * Also initializes divx/xvid/lavc_version/build.
1881 static int decode_user_data(MpegEncContext *s, GetBitContext *gb){
1885 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
1888 for(i=0; i<255 && get_bits_count(gb) < gb->size_in_bits; i++){
1889 if(show_bits(gb, 23) == 0) break;
1890 buf[i]= get_bits(gb, 8);
1894 /* divx detection */
1895 e=sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
1897 e=sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
1899 s->divx_version= ver;
1900 s->divx_build= build;
1901 s->divx_packed= e==3 && last=='p';
1902 if(s->divx_packed && !s->showed_packed_warning) {
1903 av_log(s->avctx, AV_LOG_WARNING, "Invalid and inefficient vfw-avi packed B frames detected\n");
1904 s->showed_packed_warning=1;
1908 /* libavcodec detection */
1909 e=sscanf(buf, "FFmpe%*[^b]b%d", &build)+3;
1911 e=sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
1913 e=sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3)+1;
1915 build= (ver<<16) + (ver2<<8) + ver3;
1918 if(strcmp(buf, "ffmpeg")==0){
1919 s->lavc_build= 4600;
1923 s->lavc_build= build;
1926 /* Xvid detection */
1927 e=sscanf(buf, "XviD%d", &build);
1929 s->xvid_build= build;
1935 static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
1936 int time_incr, time_increment;
1938 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
1939 if(s->pict_type==AV_PICTURE_TYPE_B && s->low_delay && s->vol_control_parameters==0 && !(s->flags & CODEC_FLAG_LOW_DELAY)){
1940 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n");
1944 s->partitioned_frame= s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_B;
1945 if(s->partitioned_frame)
1946 s->decode_mb= mpeg4_decode_partitioned_mb;
1948 s->decode_mb= mpeg4_decode_mb;
1951 while (get_bits1(gb) != 0)
1954 check_marker(gb, "before time_increment");
1956 if(s->time_increment_bits==0 || !(show_bits(gb, s->time_increment_bits+1)&1)){
1957 av_log(s->avctx, AV_LOG_ERROR, "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
1959 for(s->time_increment_bits=1 ;s->time_increment_bits<16; s->time_increment_bits++){
1960 if ( s->pict_type == AV_PICTURE_TYPE_P
1961 || (s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE)) {
1962 if((show_bits(gb, s->time_increment_bits+6)&0x37) == 0x30) break;
1964 if((show_bits(gb, s->time_increment_bits+5)&0x1F) == 0x18) break;
1967 av_log(s->avctx, AV_LOG_ERROR, "my guess is %d bits ;)\n",s->time_increment_bits);
1968 if (s->avctx->time_base.den && 4*s->avctx->time_base.den < 1<<s->time_increment_bits) {
1969 s->avctx->time_base.den = 1<<s->time_increment_bits;
1973 if(IS_3IV1) time_increment= get_bits1(gb); //FIXME investigate further
1974 else time_increment= get_bits(gb, s->time_increment_bits);
1976 if(s->pict_type!=AV_PICTURE_TYPE_B){
1977 s->last_time_base= s->time_base;
1978 s->time_base+= time_incr;
1979 s->time= s->time_base*s->avctx->time_base.den + time_increment;
1980 if(s->workaround_bugs&FF_BUG_UMP4){
1981 if(s->time < s->last_non_b_time){
1982 /* header is not mpeg-4-compatible, broken encoder,
1983 * trying to workaround */
1985 s->time+= s->avctx->time_base.den;
1988 s->pp_time= s->time - s->last_non_b_time;
1989 s->last_non_b_time= s->time;
1991 s->time= (s->last_time_base + time_incr)*s->avctx->time_base.den + time_increment;
1992 s->pb_time= s->pp_time - (s->last_non_b_time - s->time);
1993 if(s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0){
1994 /* messed up order, maybe after seeking? skipping current b-frame */
1995 return FRAME_SKIPPED;
1997 ff_mpeg4_init_direct_mv(s);
1999 if(s->t_frame==0) s->t_frame= s->pb_time;
2000 if(s->t_frame==0) s->t_frame=1; // 1/0 protection
2001 s->pp_field_time= ( ROUNDED_DIV(s->last_non_b_time, s->t_frame)
2002 - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
2003 s->pb_field_time= ( ROUNDED_DIV(s->time, s->t_frame)
2004 - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
2005 if(!s->progressive_sequence){
2006 if(s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1)
2007 return FRAME_SKIPPED;
2011 if(s->avctx->time_base.num)
2012 s->current_picture_ptr->f.pts = ROUNDED_DIV(s->time, s->avctx->time_base.num);
2014 s->current_picture_ptr->f.pts = AV_NOPTS_VALUE;
2015 if(s->avctx->debug&FF_DEBUG_PTS)
2016 av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n",
2017 s->current_picture_ptr->f.pts);
2019 check_marker(gb, "before vop_coded");
2022 if (get_bits1(gb) != 1){
2023 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
2024 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2025 return FRAME_SKIPPED;
2027 if (s->shape != BIN_ONLY_SHAPE && ( s->pict_type == AV_PICTURE_TYPE_P
2028 || (s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE))) {
2029 /* rounding type for motion estimation */
2030 s->no_rounding = get_bits1(gb);
2034 //FIXME reduced res stuff
2036 if (s->shape != RECT_SHAPE) {
2037 if (s->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2038 skip_bits(gb, 13); /* width */
2039 skip_bits1(gb); /* marker */
2040 skip_bits(gb, 13); /* height */
2041 skip_bits1(gb); /* marker */
2042 skip_bits(gb, 13); /* hor_spat_ref */
2043 skip_bits1(gb); /* marker */
2044 skip_bits(gb, 13); /* ver_spat_ref */
2046 skip_bits1(gb); /* change_CR_disable */
2048 if (get_bits1(gb) != 0) {
2049 skip_bits(gb, 8); /* constant_alpha_value */
2052 //FIXME complexity estimation stuff
2054 if (s->shape != BIN_ONLY_SHAPE) {
2055 skip_bits_long(gb, s->cplx_estimation_trash_i);
2056 if(s->pict_type != AV_PICTURE_TYPE_I)
2057 skip_bits_long(gb, s->cplx_estimation_trash_p);
2058 if(s->pict_type == AV_PICTURE_TYPE_B)
2059 skip_bits_long(gb, s->cplx_estimation_trash_b);
2061 if(get_bits_left(gb) < 3) {
2062 av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2065 s->intra_dc_threshold= ff_mpeg4_dc_threshold[ get_bits(gb, 3) ];
2066 if(!s->progressive_sequence){
2067 s->top_field_first= get_bits1(gb);
2068 s->alternate_scan= get_bits1(gb);
2070 s->alternate_scan= 0;
2073 if(s->alternate_scan){
2074 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
2075 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
2076 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2077 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2079 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
2080 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
2081 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2082 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2085 if(s->pict_type == AV_PICTURE_TYPE_S && (s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE)){
2086 if(mpeg4_decode_sprite_trajectory(s, gb) < 0)
2088 if(s->sprite_brightness_change) av_log(s->avctx, AV_LOG_ERROR, "sprite_brightness_change not supported\n");
2089 if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2092 if (s->shape != BIN_ONLY_SHAPE) {
2093 s->chroma_qscale= s->qscale = get_bits(gb, s->quant_precision);
2095 av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (qscale=0)\n");
2096 return -1; // makes no sense to continue, as there is nothing left from the image then
2099 if (s->pict_type != AV_PICTURE_TYPE_I) {
2100 s->f_code = get_bits(gb, 3); /* fcode_for */
2102 av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (f_code=0)\n");
2104 return -1; // makes no sense to continue, as the MV decoding will break very quickly
2109 if (s->pict_type == AV_PICTURE_TYPE_B) {
2110 s->b_code = get_bits(gb, 3);
2112 av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (b_code=0)\n");
2114 return -1; // makes no sense to continue, as the MV decoding will break very quickly
2119 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2120 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 time:%"PRId64" tincr:%d\n",
2121 s->qscale, s->f_code, s->b_code,
2122 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")),
2123 gb->size_in_bits,s->progressive_sequence, s->alternate_scan, s->top_field_first,
2124 s->quarter_sample ? "q" : "h", s->data_partitioning, s->resync_marker, s->num_sprite_warping_points,
2125 s->sprite_warping_accuracy, 1-s->no_rounding, s->vo_type, s->vol_control_parameters ? " VOLC" : " ", s->intra_dc_threshold,
2126 s->cplx_estimation_trash_i, s->cplx_estimation_trash_p, s->cplx_estimation_trash_b,
2132 if(!s->scalability){
2133 if (s->shape!=RECT_SHAPE && s->pict_type!=AV_PICTURE_TYPE_I) {
2134 skip_bits1(gb); // vop shape coding type
2137 if(s->enhancement_type){
2138 int load_backward_shape= get_bits1(gb);
2139 if(load_backward_shape){
2140 av_log(s->avctx, AV_LOG_ERROR, "load backward shape isn't supported\n");
2143 skip_bits(gb, 2); //ref_select_code
2146 /* detect buggy encoders which don't set the low_delay flag (divx4/xvid/opendivx)*/
2147 // note we cannot detect divx5 without b-frames easily (although it's buggy too)
2148 if(s->vo_type==0 && s->vol_control_parameters==0 && s->divx_version==-1 && s->picture_number==0){
2149 av_log(s->avctx, AV_LOG_WARNING, "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2153 s->picture_number++; // better than pic number==0 always ;)
2155 s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table; //FIXME add short header support
2156 s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
2158 if(s->workaround_bugs&FF_BUG_EDGE){
2159 s->h_edge_pos= s->width;
2160 s->v_edge_pos= s->height;
2166 * Decode mpeg4 headers.
2167 * @return <0 if no VOP found (or a damaged one)
2168 * FRAME_SKIPPED if a not coded VOP is found
2169 * 0 if a VOP is found
2171 int ff_mpeg4_decode_picture_header(MpegEncContext * s, GetBitContext *gb)
2173 unsigned startcode, v;
2175 /* search next start code */
2178 if(s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630){
2180 if(get_bits(gb, 8) == 0xF0)
2186 if(get_bits_count(gb) >= gb->size_in_bits){
2187 if(gb->size_in_bits==8 && (s->divx_version>=0 || s->xvid_build>=0) || s->codec_tag == AV_RL32("QMP4")){
2188 av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
2189 return FRAME_SKIPPED; //divx bug
2191 return -1; //end of stream
2194 /* use the bits after the test */
2195 v = get_bits(gb, 8);
2196 startcode = ((startcode << 8) | v) & 0xffffffff;
2198 if((startcode&0xFFFFFF00) != 0x100)
2199 continue; //no startcode
2201 if(s->avctx->debug&FF_DEBUG_STARTCODE){
2202 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2203 if (startcode<=0x11F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2204 else if(startcode<=0x12F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2205 else if(startcode<=0x13F) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2206 else if(startcode<=0x15F) av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2207 else if(startcode<=0x1AF) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2208 else if(startcode==0x1B0) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2209 else if(startcode==0x1B1) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2210 else if(startcode==0x1B2) av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2211 else if(startcode==0x1B3) av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2212 else if(startcode==0x1B4) av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2213 else if(startcode==0x1B5) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2214 else if(startcode==0x1B6) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2215 else if(startcode==0x1B7) av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2216 else if(startcode==0x1B8) av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2217 else if(startcode==0x1B9) av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2218 else if(startcode==0x1BA) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2219 else if(startcode==0x1BB) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2220 else if(startcode==0x1BC) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2221 else if(startcode==0x1BD) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2222 else if(startcode==0x1BE) av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2223 else if(startcode==0x1BF) av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2224 else if(startcode==0x1C0) av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2225 else if(startcode==0x1C1) av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2226 else if(startcode==0x1C2) av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2227 else if(startcode==0x1C3) av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2228 else if(startcode<=0x1C5) av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2229 else if(startcode<=0x1FF) av_log(s->avctx, AV_LOG_DEBUG, "System start");
2230 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2233 if(startcode >= 0x120 && startcode <= 0x12F){
2234 if(decode_vol_header(s, gb) < 0)
2237 else if(startcode == USER_DATA_STARTCODE){
2238 decode_user_data(s, gb);
2240 else if(startcode == GOP_STARTCODE){
2241 mpeg4_decode_gop_header(s, gb);
2243 else if(startcode == VOS_STARTCODE){
2244 mpeg4_decode_profile_level(s, gb);
2246 else if(startcode == VOP_STARTCODE){
2254 if(s->flags& CODEC_FLAG_LOW_DELAY)
2256 s->avctx->has_b_frames= !s->low_delay;
2257 return decode_vop_header(s, gb);
2260 av_cold void ff_mpeg4videodec_static_init(void) {
2261 static int done = 0;
2264 ff_init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
2265 ff_init_rl(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
2266 ff_init_rl(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
2267 INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
2268 INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
2269 INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
2270 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2271 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2272 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2273 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2274 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2275 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2276 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2277 &ff_sprite_trajectory_tab[0][1], 4, 2,
2278 &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2279 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2280 &ff_mb_type_b_tab[0][1], 2, 1,
2281 &ff_mb_type_b_tab[0][0], 2, 1, 16);
2286 static av_cold int decode_init(AVCodecContext *avctx)
2288 MpegEncContext *s = avctx->priv_data;
2296 if((ret=ff_h263_decode_init(avctx)) < 0)
2299 ff_mpeg4videodec_static_init();
2302 s->low_delay = 0; //default, might be overridden in the vol header during header parsing
2303 s->decode_mb= mpeg4_decode_mb;
2304 s->time_increment_bits = 4; /* default value for broken headers */
2305 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
2307 avctx->internal->allocate_progress = 1;
2312 static const AVProfile mpeg4_video_profiles[] = {
2313 { FF_PROFILE_MPEG4_SIMPLE, "Simple Profile" },
2314 { FF_PROFILE_MPEG4_SIMPLE_SCALABLE, "Simple Scalable Profile" },
2315 { FF_PROFILE_MPEG4_CORE, "Core Profile" },
2316 { FF_PROFILE_MPEG4_MAIN, "Main Profile" },
2317 { FF_PROFILE_MPEG4_N_BIT, "N-bit Profile" },
2318 { FF_PROFILE_MPEG4_SCALABLE_TEXTURE, "Scalable Texture Profile" },
2319 { FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION, "Simple Face Animation Profile" },
2320 { FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE, "Basic Animated Texture Profile" },
2321 { FF_PROFILE_MPEG4_HYBRID, "Hybrid Profile" },
2322 { FF_PROFILE_MPEG4_ADVANCED_REAL_TIME, "Advanced Real Time Simple Profile" },
2323 { FF_PROFILE_MPEG4_CORE_SCALABLE, "Code Scalable Profile" },
2324 { FF_PROFILE_MPEG4_ADVANCED_CODING, "Advanced Coding Profile" },
2325 { FF_PROFILE_MPEG4_ADVANCED_CORE, "Advanced Core Profile" },
2326 { FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" },
2327 { FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" },
2328 { FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" },
2329 { FF_PROFILE_UNKNOWN },
2332 static const AVOption mpeg4_options[] = {
2333 {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
2334 {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
2338 static const AVClass mpeg4_class = {
2339 "MPEG4 Video Decoder",
2340 av_default_item_name,
2342 LIBAVUTIL_VERSION_INT,
2345 static const AVClass mpeg4_vdpau_class = {
2346 "MPEG4 Video VDPAU Decoder",
2347 av_default_item_name,
2349 LIBAVUTIL_VERSION_INT,
2352 AVCodec ff_mpeg4_decoder = {
2354 .type = AVMEDIA_TYPE_VIDEO,
2355 .id = AV_CODEC_ID_MPEG4,
2356 .priv_data_size = sizeof(MpegEncContext),
2357 .init = decode_init,
2358 .close = ff_h263_decode_end,
2359 .decode = ff_h263_decode_frame,
2360 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2361 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2362 CODEC_CAP_FRAME_THREADS,
2363 .flush = ff_mpeg_flush,
2365 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2366 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
2367 .profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
2368 .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_mpeg_update_thread_context),
2369 .priv_class = &mpeg4_class,
2373 #if CONFIG_MPEG4_VDPAU_DECODER
2374 AVCodec ff_mpeg4_vdpau_decoder = {
2375 .name = "mpeg4_vdpau",
2376 .type = AVMEDIA_TYPE_VIDEO,
2377 .id = AV_CODEC_ID_MPEG4,
2378 .priv_data_size = sizeof(MpegEncContext),
2379 .init = decode_init,
2380 .close = ff_h263_decode_end,
2381 .decode = ff_h263_decode_frame,
2382 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2383 CODEC_CAP_HWACCEL_VDPAU,
2384 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2385 .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_VDPAU_MPEG4,
2387 .priv_class = &mpeg4_vdpau_class,