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 "mpegvideo.h"
27 #include "mpeg4video.h"
31 // The defines below define the number of bits that are read at once for
32 // reading vlc values. Changing these may improve speed and data cache needs
33 // be aware though that decreasing them may need the number of stages that is
34 // passed to get_vlc* to be increased.
35 #define SPRITE_TRAJ_VLC_BITS 6
37 #define MB_TYPE_B_VLC_BITS 4
40 static VLC dc_lum, dc_chrom;
41 static VLC sprite_trajectory;
42 static VLC mb_type_b_vlc;
44 static const int mb_type_b_map[4]= {
45 MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
46 MB_TYPE_L0L1 | MB_TYPE_16x16,
47 MB_TYPE_L1 | MB_TYPE_16x16,
48 MB_TYPE_L0 | MB_TYPE_16x16,
53 * @param n block index (0-3 are luma, 4-5 are chroma)
54 * @param dir the ac prediction direction
56 void ff_mpeg4_pred_ac(MpegEncContext * s, DCTELEM *block, int n,
60 int16_t *ac_val, *ac_val1;
61 int8_t * const qscale_table = s->current_picture.f.qscale_table;
64 ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
68 const int xy= s->mb_x-1 + s->mb_y*s->mb_stride;
72 if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){
75 block[s->dsp.idct_permutation[i<<3]] += ac_val[i];
78 /* different qscale, we must rescale */
80 block[s->dsp.idct_permutation[i<<3]] += ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale);
84 const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride;
86 ac_val -= 16 * s->block_wrap[n];
88 if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
91 block[s->dsp.idct_permutation[i]] += ac_val[i + 8];
94 /* different qscale, we must rescale */
96 block[s->dsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale);
103 ac_val1[i ] = block[s->dsp.idct_permutation[i<<3]];
107 ac_val1[8 + i] = block[s->dsp.idct_permutation[i ]];
112 * check if the next stuff is a resync marker or the end.
115 static inline int mpeg4_is_resync(MpegEncContext *s){
116 int bits_count= get_bits_count(&s->gb);
117 int v= show_bits(&s->gb, 16);
119 if(s->workaround_bugs&FF_BUG_NO_PADDING && !s->resync_marker){
124 if(s->pict_type==AV_PICTURE_TYPE_B || (v>>(8-s->pict_type)!=1) || s->partitioned_frame)
126 skip_bits(&s->gb, 8+s->pict_type);
127 bits_count+= 8+s->pict_type;
128 v= show_bits(&s->gb, 16);
131 if(bits_count + 8 >= s->gb.size_in_bits){
133 v|= 0x7F >> (7-(bits_count&7));
138 if(v == ff_mpeg4_resync_prefix[bits_count&7]){
140 int mb_num_bits= av_log2(s->mb_num - 1) + 1;
141 GetBitContext gb= s->gb;
143 skip_bits(&s->gb, 1);
144 align_get_bits(&s->gb);
146 for(len=0; len<32; len++){
147 if(get_bits1(&s->gb)) break;
150 mb_num= get_bits(&s->gb, mb_num_bits);
151 if(!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
156 if(len>=ff_mpeg4_get_video_packet_prefix_length(s))
163 static int mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb)
166 int a= 2<<s->sprite_warping_accuracy;
167 int rho= 3-s->sprite_warping_accuracy;
169 const int vop_ref[4][2]= {{0,0}, {s->width,0}, {0, s->height}, {s->width, s->height}}; // only true for rectangle shapes
170 int d[4][2]={{0,0}, {0,0}, {0,0}, {0,0}};
171 int sprite_ref[4][2];
172 int virtual_ref[2][2];
182 for(i=0; i<s->num_sprite_warping_points; i++){
186 length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
188 x= get_xbits(gb, length);
190 if(!(s->divx_version==500 && s->divx_build==413)) skip_bits1(gb); /* marker bit */
192 length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
194 y=get_xbits(gb, length);
196 skip_bits1(gb); /* marker bit */
197 s->sprite_traj[i][0]= d[i][0]= x;
198 s->sprite_traj[i][1]= d[i][1]= y;
201 s->sprite_traj[i][0]= s->sprite_traj[i][1]= 0;
203 while((1<<alpha)<w) alpha++;
204 while((1<<beta )<h) beta++; // there seems to be a typo in the mpeg4 std for the definition of w' and h'
208 // Note, the 4th point isn't used for GMC
209 if(s->divx_version==500 && s->divx_build==413){
210 sprite_ref[0][0]= a*vop_ref[0][0] + d[0][0];
211 sprite_ref[0][1]= a*vop_ref[0][1] + d[0][1];
212 sprite_ref[1][0]= a*vop_ref[1][0] + d[0][0] + d[1][0];
213 sprite_ref[1][1]= a*vop_ref[1][1] + d[0][1] + d[1][1];
214 sprite_ref[2][0]= a*vop_ref[2][0] + d[0][0] + d[2][0];
215 sprite_ref[2][1]= a*vop_ref[2][1] + d[0][1] + d[2][1];
217 sprite_ref[0][0]= (a>>1)*(2*vop_ref[0][0] + d[0][0]);
218 sprite_ref[0][1]= (a>>1)*(2*vop_ref[0][1] + d[0][1]);
219 sprite_ref[1][0]= (a>>1)*(2*vop_ref[1][0] + d[0][0] + d[1][0]);
220 sprite_ref[1][1]= (a>>1)*(2*vop_ref[1][1] + d[0][1] + d[1][1]);
221 sprite_ref[2][0]= (a>>1)*(2*vop_ref[2][0] + d[0][0] + d[2][0]);
222 sprite_ref[2][1]= (a>>1)*(2*vop_ref[2][1] + d[0][1] + d[2][1]);
224 /* sprite_ref[3][0]= (a>>1)*(2*vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
225 sprite_ref[3][1]= (a>>1)*(2*vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
227 // this is mostly identical to the mpeg4 std (and is totally unreadable because of that ...)
228 // perhaps it should be reordered to be more readable ...
229 // the idea behind this virtual_ref mess is to be able to use shifts later per pixel instead of divides
230 // so the distance between points is converted from w&h based to w2&h2 based which are of the 2^x form
231 virtual_ref[0][0]= 16*(vop_ref[0][0] + w2)
232 + 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);
233 virtual_ref[0][1]= 16*vop_ref[0][1]
234 + 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);
235 virtual_ref[1][0]= 16*vop_ref[0][0]
236 + 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);
237 virtual_ref[1][1]= 16*(vop_ref[0][1] + h2)
238 + 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);
240 switch(s->num_sprite_warping_points)
243 s->sprite_offset[0][0]= 0;
244 s->sprite_offset[0][1]= 0;
245 s->sprite_offset[1][0]= 0;
246 s->sprite_offset[1][1]= 0;
247 s->sprite_delta[0][0]= a;
248 s->sprite_delta[0][1]= 0;
249 s->sprite_delta[1][0]= 0;
250 s->sprite_delta[1][1]= a;
251 s->sprite_shift[0]= 0;
252 s->sprite_shift[1]= 0;
255 s->sprite_offset[0][0]= sprite_ref[0][0] - a*vop_ref[0][0];
256 s->sprite_offset[0][1]= sprite_ref[0][1] - a*vop_ref[0][1];
257 s->sprite_offset[1][0]= ((sprite_ref[0][0]>>1)|(sprite_ref[0][0]&1)) - a*(vop_ref[0][0]/2);
258 s->sprite_offset[1][1]= ((sprite_ref[0][1]>>1)|(sprite_ref[0][1]&1)) - a*(vop_ref[0][1]/2);
259 s->sprite_delta[0][0]= a;
260 s->sprite_delta[0][1]= 0;
261 s->sprite_delta[1][0]= 0;
262 s->sprite_delta[1][1]= a;
263 s->sprite_shift[0]= 0;
264 s->sprite_shift[1]= 0;
267 s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+rho))
268 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][0])
269 + ( r*sprite_ref[0][1] - virtual_ref[0][1])*(-vop_ref[0][1])
270 + (1<<(alpha+rho-1));
271 s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+rho))
272 + (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-vop_ref[0][0])
273 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][1])
274 + (1<<(alpha+rho-1));
275 s->sprite_offset[1][0]= ( (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][0] + 1)
276 +( r*sprite_ref[0][1] - virtual_ref[0][1])*(-2*vop_ref[0][1] + 1)
277 +2*w2*r*sprite_ref[0][0]
279 + (1<<(alpha+rho+1)));
280 s->sprite_offset[1][1]= ( (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-2*vop_ref[0][0] + 1)
281 +(-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][1] + 1)
282 +2*w2*r*sprite_ref[0][1]
284 + (1<<(alpha+rho+1)));
285 s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
286 s->sprite_delta[0][1]= (+r*sprite_ref[0][1] - virtual_ref[0][1]);
287 s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1]);
288 s->sprite_delta[1][1]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
290 s->sprite_shift[0]= alpha+rho;
291 s->sprite_shift[1]= alpha+rho+2;
294 min_ab= FFMIN(alpha, beta);
297 s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+beta+rho-min_ab))
298 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-vop_ref[0][0])
299 + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-vop_ref[0][1])
300 + (1<<(alpha+beta+rho-min_ab-1));
301 s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+beta+rho-min_ab))
302 + (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-vop_ref[0][0])
303 + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-vop_ref[0][1])
304 + (1<<(alpha+beta+rho-min_ab-1));
305 s->sprite_offset[1][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-2*vop_ref[0][0] + 1)
306 + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-2*vop_ref[0][1] + 1)
307 + 2*w2*h3*r*sprite_ref[0][0]
309 + (1<<(alpha+beta+rho-min_ab+1));
310 s->sprite_offset[1][1]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-2*vop_ref[0][0] + 1)
311 + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-2*vop_ref[0][1] + 1)
312 + 2*w2*h3*r*sprite_ref[0][1]
314 + (1<<(alpha+beta+rho-min_ab+1));
315 s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3;
316 s->sprite_delta[0][1]= (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3;
317 s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3;
318 s->sprite_delta[1][1]= (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3;
320 s->sprite_shift[0]= alpha + beta + rho - min_ab;
321 s->sprite_shift[1]= alpha + beta + rho - min_ab + 2;
324 /* try to simplify the situation */
325 if( s->sprite_delta[0][0] == a<<s->sprite_shift[0]
326 && s->sprite_delta[0][1] == 0
327 && s->sprite_delta[1][0] == 0
328 && s->sprite_delta[1][1] == a<<s->sprite_shift[0])
330 s->sprite_offset[0][0]>>=s->sprite_shift[0];
331 s->sprite_offset[0][1]>>=s->sprite_shift[0];
332 s->sprite_offset[1][0]>>=s->sprite_shift[1];
333 s->sprite_offset[1][1]>>=s->sprite_shift[1];
334 s->sprite_delta[0][0]= a;
335 s->sprite_delta[0][1]= 0;
336 s->sprite_delta[1][0]= 0;
337 s->sprite_delta[1][1]= a;
338 s->sprite_shift[0]= 0;
339 s->sprite_shift[1]= 0;
340 s->real_sprite_warping_points=1;
343 int shift_y= 16 - s->sprite_shift[0];
344 int shift_c= 16 - s->sprite_shift[1];
346 s->sprite_offset[0][i]<<= shift_y;
347 s->sprite_offset[1][i]<<= shift_c;
348 s->sprite_delta[0][i]<<= shift_y;
349 s->sprite_delta[1][i]<<= shift_y;
350 s->sprite_shift[i]= 16;
352 s->real_sprite_warping_points= s->num_sprite_warping_points;
358 * Decode the next video packet.
359 * @return <0 if something went wrong
361 int ff_mpeg4_decode_video_packet_header(MpegEncContext *s)
363 int mb_num_bits= av_log2(s->mb_num - 1) + 1;
364 int header_extension=0, mb_num, len;
366 /* is there enough space left for a video packet + header */
367 if( get_bits_count(&s->gb) > s->gb.size_in_bits-20) return -1;
369 for(len=0; len<32; len++){
370 if(get_bits1(&s->gb)) break;
373 if(len!=ff_mpeg4_get_video_packet_prefix_length(s)){
374 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
378 if(s->shape != RECT_SHAPE){
379 header_extension= get_bits1(&s->gb);
380 //FIXME more stuff here
383 mb_num= get_bits(&s->gb, mb_num_bits);
384 if(mb_num>=s->mb_num){
385 av_log(s->avctx, AV_LOG_ERROR, "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
389 s->mb_x= mb_num % s->mb_width;
390 s->mb_y= mb_num / s->mb_width;
392 if(s->shape != BIN_ONLY_SHAPE){
393 int qscale= get_bits(&s->gb, s->quant_precision);
395 s->chroma_qscale=s->qscale= qscale;
398 if(s->shape == RECT_SHAPE){
399 header_extension= get_bits1(&s->gb);
401 if(header_extension){
404 while (get_bits1(&s->gb) != 0)
407 check_marker(&s->gb, "before time_increment in video packed header");
408 skip_bits(&s->gb, s->time_increment_bits); /* time_increment */
409 check_marker(&s->gb, "before vop_coding_type in video packed header");
411 skip_bits(&s->gb, 2); /* vop coding type */
412 //FIXME not rect stuff here
414 if(s->shape != BIN_ONLY_SHAPE){
415 skip_bits(&s->gb, 3); /* intra dc vlc threshold */
416 //FIXME don't just ignore everything
417 if(s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
418 if(mpeg4_decode_sprite_trajectory(s, &s->gb) < 0)
420 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
423 //FIXME reduced res stuff here
425 if (s->pict_type != AV_PICTURE_TYPE_I) {
426 int f_code = get_bits(&s->gb, 3); /* fcode_for */
428 av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (f_code=0)\n");
431 if (s->pict_type == AV_PICTURE_TYPE_B) {
432 int b_code = get_bits(&s->gb, 3);
434 av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (b_code=0)\n");
439 //FIXME new-pred stuff
445 * Get the average motion vector for a GMC MB.
446 * @param n either 0 for the x component or 1 for y
447 * @return the average MV for a GMC MB
449 static inline int get_amv(MpegEncContext *s, int n){
450 int x, y, mb_v, sum, dx, dy, shift;
451 int len = 1 << (s->f_code + 4);
452 const int a= s->sprite_warping_accuracy;
454 if(s->workaround_bugs & FF_BUG_AMV)
455 len >>= s->quarter_sample;
457 if(s->real_sprite_warping_points==1){
458 if(s->divx_version==500 && s->divx_build==413)
459 sum= s->sprite_offset[0][n] / (1<<(a - s->quarter_sample));
461 sum= RSHIFT(s->sprite_offset[0][n]<<s->quarter_sample, a);
463 dx= s->sprite_delta[n][0];
464 dy= s->sprite_delta[n][1];
465 shift= s->sprite_shift[0];
466 if(n) dy -= 1<<(shift + a + 1);
467 else dx -= 1<<(shift + a + 1);
468 mb_v= s->sprite_offset[0][n] + dx*s->mb_x*16 + dy*s->mb_y*16;
481 sum= RSHIFT(sum, a+8-s->quarter_sample);
484 if (sum < -len) sum= -len;
485 else if (sum >= len) sum= len-1;
491 * Decode the dc value.
492 * @param n block index (0-3 are luma, 4-5 are chroma)
493 * @param dir_ptr the prediction direction will be stored here
494 * @return the quantized dc
496 static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
501 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
503 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
504 if (code < 0 || code > 9 /* && s->nbit<9 */){
505 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
513 level= 2*get_bits1(&s->gb)-1;
515 if(get_bits1(&s->gb))
516 level = get_bits(&s->gb, code-1) + (1<<(code-1));
518 level = -get_bits(&s->gb, code-1) - (1<<(code-1));
521 level = get_xbits(&s->gb, code);
525 if(get_bits1(&s->gb)==0){ /* marker */
526 if(s->err_recognition&(AV_EF_BITSTREAM|AV_EF_COMPLIANT)){
527 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
534 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
538 * Decode first partition.
539 * @return number of MBs decoded or <0 if an error occurred
541 static int mpeg4_decode_partition_a(MpegEncContext *s){
543 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
545 /* decode first partition */
547 s->first_slice_line=1;
548 for(; s->mb_y<s->mb_height; s->mb_y++){
549 ff_init_block_index(s);
550 for(; s->mb_x<s->mb_width; s->mb_x++){
551 const int xy= s->mb_x + s->mb_y*s->mb_stride;
556 ff_update_block_index(s);
557 if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
558 s->first_slice_line=0;
560 if(s->pict_type==AV_PICTURE_TYPE_I){
564 if(show_bits_long(&s->gb, 19)==DC_MARKER){
568 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
570 av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
575 s->cbp_table[xy]= cbpc & 3;
576 s->current_picture.f.mb_type[xy] = MB_TYPE_INTRA;
580 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
582 s->current_picture.f.qscale_table[xy]= s->qscale;
584 s->mbintra_table[xy]= 1;
587 int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
589 av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
593 if(dc_pred_dir) dir|=1;
595 s->pred_dir_table[xy]= dir;
596 }else{ /* P/S_TYPE */
597 int mx, my, pred_x, pred_y, bits;
598 int16_t * const mot_val = s->current_picture.f.motion_val[0][s->block_index[0]];
599 const int stride= s->b8_stride*2;
602 bits= show_bits(&s->gb, 17);
603 if(bits==MOTION_MARKER){
609 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
610 s->current_picture.f.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
614 s->current_picture.f.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
617 mot_val[0 ]= mot_val[2 ]=
618 mot_val[0+stride]= mot_val[2+stride]= mx;
619 mot_val[1 ]= mot_val[3 ]=
620 mot_val[1+stride]= mot_val[3+stride]= my;
622 if(s->mbintra_table[xy])
623 ff_clean_intra_table_entries(s);
627 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
629 av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
635 s->cbp_table[xy]= cbpc&(8+3); //8 is dquant
637 s->mb_intra = ((cbpc & 4) != 0);
640 s->current_picture.f.mb_type[xy] = MB_TYPE_INTRA;
641 s->mbintra_table[xy]= 1;
642 mot_val[0 ]= mot_val[2 ]=
643 mot_val[0+stride]= mot_val[2+stride]= 0;
644 mot_val[1 ]= mot_val[3 ]=
645 mot_val[1+stride]= mot_val[3+stride]= 0;
647 if(s->mbintra_table[xy])
648 ff_clean_intra_table_entries(s);
650 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
651 s->mcsel= get_bits1(&s->gb);
654 if ((cbpc & 16) == 0) {
655 /* 16x16 motion prediction */
657 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
659 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
663 my = ff_h263_decode_motion(s, pred_y, s->f_code);
666 s->current_picture.f.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
670 s->current_picture.f.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
673 mot_val[0 ]= mot_val[2 ] =
674 mot_val[0+stride]= mot_val[2+stride]= mx;
675 mot_val[1 ]= mot_val[3 ]=
676 mot_val[1+stride]= mot_val[3+stride]= my;
679 s->current_picture.f.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
681 int16_t *mot_val= ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
682 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
686 my = ff_h263_decode_motion(s, pred_y, s->f_code);
703 * decode second partition.
704 * @return <0 if an error occurred
706 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count){
708 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
710 s->mb_x= s->resync_mb_x;
711 s->first_slice_line=1;
712 for(s->mb_y= s->resync_mb_y; mb_num < mb_count; s->mb_y++){
713 ff_init_block_index(s);
714 for(; mb_num < mb_count && s->mb_x<s->mb_width; s->mb_x++){
715 const int xy= s->mb_x + s->mb_y*s->mb_stride;
718 ff_update_block_index(s);
719 if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
720 s->first_slice_line=0;
722 if(s->pict_type==AV_PICTURE_TYPE_I){
723 int ac_pred= get_bits1(&s->gb);
724 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
726 av_log(s->avctx, AV_LOG_ERROR, "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
730 s->cbp_table[xy]|= cbpy<<2;
731 s->current_picture.f.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
732 }else{ /* P || S_TYPE */
733 if (IS_INTRA(s->current_picture.f.mb_type[xy])) {
735 int ac_pred = get_bits1(&s->gb);
736 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
739 av_log(s->avctx, AV_LOG_ERROR, "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
743 if(s->cbp_table[xy] & 8) {
744 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
746 s->current_picture.f.qscale_table[xy] = s->qscale;
750 int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
752 av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
756 if(dc_pred_dir) dir|=1;
758 s->cbp_table[xy]&= 3; //remove dquant
759 s->cbp_table[xy]|= cbpy<<2;
760 s->current_picture.f.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
761 s->pred_dir_table[xy]= dir;
762 } else if (IS_SKIP(s->current_picture.f.mb_type[xy])) {
763 s->current_picture.f.qscale_table[xy] = s->qscale;
766 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
769 av_log(s->avctx, AV_LOG_ERROR, "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
773 if(s->cbp_table[xy] & 8) {
774 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
776 s->current_picture.f.qscale_table[xy] = s->qscale;
778 s->cbp_table[xy]&= 3; //remove dquant
779 s->cbp_table[xy]|= (cbpy^0xf)<<2;
783 if(mb_num >= mb_count) return 0;
790 * Decode the first and second partition.
791 * @return <0 if error (and sets error type in the error_status_table)
793 int ff_mpeg4_decode_partitions(MpegEncContext *s)
796 const int part_a_error= s->pict_type==AV_PICTURE_TYPE_I ? (ER_DC_ERROR|ER_MV_ERROR) : ER_MV_ERROR;
797 const int part_a_end = s->pict_type==AV_PICTURE_TYPE_I ? (ER_DC_END |ER_MV_END) : ER_MV_END;
799 mb_num= mpeg4_decode_partition_a(s);
801 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
805 if(s->resync_mb_x + s->resync_mb_y*s->mb_width + mb_num > s->mb_num){
806 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
807 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
811 s->mb_num_left= mb_num;
813 if(s->pict_type==AV_PICTURE_TYPE_I){
814 while(show_bits(&s->gb, 9) == 1)
815 skip_bits(&s->gb, 9);
816 if(get_bits_long(&s->gb, 19)!=DC_MARKER){
817 av_log(s->avctx, AV_LOG_ERROR, "marker missing after first I partition at %d %d\n", s->mb_x, s->mb_y);
821 while(show_bits(&s->gb, 10) == 1)
822 skip_bits(&s->gb, 10);
823 if(get_bits(&s->gb, 17)!=MOTION_MARKER){
824 av_log(s->avctx, AV_LOG_ERROR, "marker missing after first P partition at %d %d\n", s->mb_x, s->mb_y);
828 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, part_a_end);
830 if( mpeg4_decode_partition_b(s, mb_num) < 0){
831 if(s->pict_type==AV_PICTURE_TYPE_P)
832 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_DC_ERROR);
835 if(s->pict_type==AV_PICTURE_TYPE_P)
836 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_DC_END);
844 * @return <0 if an error occurred
846 static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
847 int n, int coded, int intra, int rvlc)
849 int level, i, last, run;
852 RL_VLC_ELEM * rl_vlc;
853 const uint8_t * scan_table;
856 //Note intra & rvlc should be optimized away if this is inlined
859 if(s->use_intra_dc_vlc){
861 if(s->partitioned_frame){
862 level = s->dc_val[0][ s->block_index[n] ];
863 if(n<4) level= FASTDIV((level + (s->y_dc_scale>>1)), s->y_dc_scale);
864 else level= FASTDIV((level + (s->c_dc_scale>>1)), s->c_dc_scale);
865 dc_pred_dir= (s->pred_dir_table[s->mb_x + s->mb_y*s->mb_stride]<<n)&32;
867 level = mpeg4_decode_dc(s, n, &dc_pred_dir);
875 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
881 rl = &ff_rvlc_rl_intra;
882 rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
884 rl = &ff_mpeg4_rl_intra;
885 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
888 if (dc_pred_dir == 0)
889 scan_table = s->intra_v_scantable.permutated; /* left */
891 scan_table = s->intra_h_scantable.permutated; /* top */
893 scan_table = s->intra_scantable.permutated;
900 s->block_last_index[n] = i;
903 if(rvlc) rl = &ff_rvlc_rl_inter;
904 else rl = &ff_h263_rl_inter;
906 scan_table = s->intra_scantable.permutated;
912 rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
914 rl_vlc = ff_h263_rl_inter.rl_vlc[0];
917 qmul = s->qscale << 1;
918 qadd = (s->qscale - 1) | 1;
920 rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
922 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
927 OPEN_READER(re, &s->gb);
929 UPDATE_CACHE(re, &s->gb);
930 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
934 if(SHOW_UBITS(re, &s->gb, 1)==0){
935 av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in rvlc esc\n");
937 }; SKIP_CACHE(re, &s->gb, 1);
939 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
940 run= SHOW_UBITS(re, &s->gb, 6);
941 SKIP_COUNTER(re, &s->gb, 1+1+6);
942 UPDATE_CACHE(re, &s->gb);
944 if(SHOW_UBITS(re, &s->gb, 1)==0){
945 av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in rvlc esc\n");
947 }; SKIP_CACHE(re, &s->gb, 1);
949 level= SHOW_UBITS(re, &s->gb, 11); SKIP_CACHE(re, &s->gb, 11);
951 if(SHOW_UBITS(re, &s->gb, 5)!=0x10){
952 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
954 }; SKIP_CACHE(re, &s->gb, 5);
956 level= level * qmul + qadd;
957 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
958 SKIP_COUNTER(re, &s->gb, 1+11+5+1);
964 cache= GET_CACHE(re, &s->gb);
969 if (cache&0x80000000) {
970 if (cache&0x40000000) {
972 SKIP_CACHE(re, &s->gb, 2);
973 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
974 run= SHOW_UBITS(re, &s->gb, 6);
975 SKIP_COUNTER(re, &s->gb, 2+1+6);
976 UPDATE_CACHE(re, &s->gb);
979 level= SHOW_SBITS(re, &s->gb, 12); LAST_SKIP_BITS(re, &s->gb, 12);
981 if(SHOW_UBITS(re, &s->gb, 1)==0){
982 av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in 3. esc\n");
984 }; SKIP_CACHE(re, &s->gb, 1);
986 level= SHOW_SBITS(re, &s->gb, 12); SKIP_CACHE(re, &s->gb, 12);
988 if(SHOW_UBITS(re, &s->gb, 1)==0){
989 av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in 3. esc\n");
993 SKIP_COUNTER(re, &s->gb, 1+12+1);
997 if(s->error_recognition >= FF_ER_COMPLIANT){
998 const int abs_level= FFABS(level);
999 if(abs_level<=MAX_LEVEL && run<=MAX_RUN){
1000 const int run1= run - rl->max_run[last][abs_level] - 1;
1001 if(abs_level <= rl->max_level[last][run]){
1002 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1005 if(s->error_recognition > FF_ER_COMPLIANT){
1006 if(abs_level <= rl->max_level[last][run]*2){
1007 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1010 if(run1 >= 0 && abs_level <= rl->max_level[last][run1]){
1011 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1018 if (level>0) level= level * qmul + qadd;
1019 else level= level * qmul - qadd;
1021 if((unsigned)(level + 2048) > 4095){
1022 if(s->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)){
1023 if(level > 2560 || level<-2560){
1024 av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc, qp=%d\n", s->qscale);
1028 level= level<0 ? -2048 : 2047;
1035 SKIP_BITS(re, &s->gb, 2);
1036 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1037 i+= run + rl->max_run[run>>7][level/qmul] +1; //FIXME opt indexing
1038 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1039 LAST_SKIP_BITS(re, &s->gb, 1);
1043 SKIP_BITS(re, &s->gb, 1);
1044 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1046 level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
1047 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1048 LAST_SKIP_BITS(re, &s->gb, 1);
1053 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1054 LAST_SKIP_BITS(re, &s->gb, 1);
1059 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1063 block[scan_table[i]] = level;
1067 block[scan_table[i]] = level;
1069 CLOSE_READER(re, &s->gb);
1073 if(!s->use_intra_dc_vlc){
1074 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1076 i -= i>>31; //if(i == -1) i=0;
1079 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1081 i = 63; /* XXX: not optimal */
1084 s->block_last_index[n] = i;
1089 * decode partition C of one MB.
1090 * @return <0 if an error occurred
1092 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, DCTELEM block[6][64])
1095 const int xy= s->mb_x + s->mb_y*s->mb_stride;
1097 mb_type = s->current_picture.f.mb_type[xy];
1098 cbp = s->cbp_table[xy];
1100 s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
1102 if (s->current_picture.f.qscale_table[xy] != s->qscale) {
1103 ff_set_qscale(s, s->current_picture.f.qscale_table[xy]);
1106 if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type==AV_PICTURE_TYPE_S) {
1109 s->mv[0][i][0] = s->current_picture.f.motion_val[0][s->block_index[i]][0];
1110 s->mv[0][i][1] = s->current_picture.f.motion_val[0][s->block_index[i]][1];
1112 s->mb_intra = IS_INTRA(mb_type);
1114 if (IS_SKIP(mb_type)) {
1117 s->block_last_index[i] = -1;
1118 s->mv_dir = MV_DIR_FORWARD;
1119 s->mv_type = MV_TYPE_16X16;
1120 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
1127 }else if(s->mb_intra){
1128 s->ac_pred = IS_ACPRED(s->current_picture.f.mb_type[xy]);
1129 }else if(!s->mb_intra){
1130 // s->mcsel= 0; //FIXME do we need to init that
1132 s->mv_dir = MV_DIR_FORWARD;
1133 if (IS_8X8(mb_type)) {
1134 s->mv_type = MV_TYPE_8X8;
1136 s->mv_type = MV_TYPE_16X16;
1139 } else { /* I-Frame */
1141 s->ac_pred = IS_ACPRED(s->current_picture.f.mb_type[xy]);
1144 if (!IS_SKIP(mb_type)) {
1146 s->dsp.clear_blocks(s->block[0]);
1147 /* decode each block */
1148 for (i = 0; i < 6; i++) {
1149 if(mpeg4_decode_block(s, block[i], i, cbp&32, s->mb_intra, s->rvlc) < 0){
1150 av_log(s->avctx, AV_LOG_ERROR, "texture corrupted at %d %d %d\n", s->mb_x, s->mb_y, s->mb_intra);
1157 /* per-MB end of slice check */
1159 if(--s->mb_num_left <= 0){
1160 if(mpeg4_is_resync(s))
1165 if(mpeg4_is_resync(s)){
1166 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1167 if(s->cbp_table[xy+delta])
1174 static int mpeg4_decode_mb(MpegEncContext *s,
1175 DCTELEM block[6][64])
1177 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1179 static int8_t quant_tab[4] = { -1, -2, 1, 2 };
1180 const int xy= s->mb_x + s->mb_y * s->mb_stride;
1182 assert(s->h263_pred);
1184 if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type==AV_PICTURE_TYPE_S) {
1186 if (get_bits1(&s->gb)) {
1190 s->block_last_index[i] = -1;
1191 s->mv_dir = MV_DIR_FORWARD;
1192 s->mv_type = MV_TYPE_16X16;
1193 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
1194 s->current_picture.f.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
1196 s->mv[0][0][0]= get_amv(s, 0);
1197 s->mv[0][0][1]= get_amv(s, 1);
1201 s->current_picture.f.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
1209 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1211 av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1216 s->dsp.clear_blocks(s->block[0]);
1218 s->mb_intra = ((cbpc & 4) != 0);
1219 if (s->mb_intra) goto intra;
1221 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
1222 s->mcsel= get_bits1(&s->gb);
1224 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1226 cbp = (cbpc & 3) | (cbpy << 2);
1228 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1230 if((!s->progressive_sequence) && (cbp || (s->workaround_bugs&FF_BUG_XVID_ILACE)))
1231 s->interlaced_dct= get_bits1(&s->gb);
1233 s->mv_dir = MV_DIR_FORWARD;
1234 if ((cbpc & 16) == 0) {
1236 s->current_picture.f.mb_type[xy] = MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
1237 /* 16x16 global motion prediction */
1238 s->mv_type = MV_TYPE_16X16;
1241 s->mv[0][0][0] = mx;
1242 s->mv[0][0][1] = my;
1243 }else if((!s->progressive_sequence) && get_bits1(&s->gb)){
1244 s->current_picture.f.mb_type[xy] = MB_TYPE_16x8 | MB_TYPE_L0 | MB_TYPE_INTERLACED;
1245 /* 16x8 field motion prediction */
1246 s->mv_type= MV_TYPE_FIELD;
1248 s->field_select[0][0]= get_bits1(&s->gb);
1249 s->field_select[0][1]= get_bits1(&s->gb);
1251 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1254 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1258 my = ff_h263_decode_motion(s, pred_y/2, s->f_code);
1262 s->mv[0][i][0] = mx;
1263 s->mv[0][i][1] = my;
1266 s->current_picture.f.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1267 /* 16x16 motion prediction */
1268 s->mv_type = MV_TYPE_16X16;
1269 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1270 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1275 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1279 s->mv[0][0][0] = mx;
1280 s->mv[0][0][1] = my;
1283 s->current_picture.f.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1284 s->mv_type = MV_TYPE_8X8;
1286 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1287 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1291 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1294 s->mv[0][i][0] = mx;
1295 s->mv[0][i][1] = my;
1300 } else if(s->pict_type==AV_PICTURE_TYPE_B) {
1301 int modb1; // first bit of modb
1302 int modb2; // second bit of modb
1305 s->mb_intra = 0; //B-frames never contain intra blocks
1306 s->mcsel=0; // ... true gmc blocks
1310 s->last_mv[i][0][0]=
1311 s->last_mv[i][0][1]=
1312 s->last_mv[i][1][0]=
1313 s->last_mv[i][1][1]= 0;
1316 ff_thread_await_progress(&s->next_picture_ptr->f, s->mb_y, 0);
1319 /* if we skipped it in the future P Frame than skip it now too */
1320 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
1325 s->block_last_index[i] = -1;
1327 s->mv_dir = MV_DIR_FORWARD;
1328 s->mv_type = MV_TYPE_16X16;
1333 s->current_picture.f.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
1337 modb1= get_bits1(&s->gb);
1339 mb_type= MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1; //like MB_TYPE_B_DIRECT but no vectors coded
1342 modb2= get_bits1(&s->gb);
1343 mb_type= get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1345 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1348 mb_type= mb_type_b_map[ mb_type ];
1351 s->dsp.clear_blocks(s->block[0]);
1352 cbp= get_bits(&s->gb, 6);
1355 if ((!IS_DIRECT(mb_type)) && cbp) {
1356 if(get_bits1(&s->gb)){
1357 ff_set_qscale(s, s->qscale + get_bits1(&s->gb)*4 - 2);
1361 if(!s->progressive_sequence){
1363 s->interlaced_dct= get_bits1(&s->gb);
1365 if(!IS_DIRECT(mb_type) && get_bits1(&s->gb)){
1366 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1367 mb_type &= ~MB_TYPE_16x16;
1369 if(USES_LIST(mb_type, 0)){
1370 s->field_select[0][0]= get_bits1(&s->gb);
1371 s->field_select[0][1]= get_bits1(&s->gb);
1373 if(USES_LIST(mb_type, 1)){
1374 s->field_select[1][0]= get_bits1(&s->gb);
1375 s->field_select[1][1]= get_bits1(&s->gb);
1381 if((mb_type & (MB_TYPE_DIRECT2|MB_TYPE_INTERLACED)) == 0){
1382 s->mv_type= MV_TYPE_16X16;
1384 if(USES_LIST(mb_type, 0)){
1385 s->mv_dir = MV_DIR_FORWARD;
1387 mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1388 my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1389 s->last_mv[0][1][0]= s->last_mv[0][0][0]= s->mv[0][0][0] = mx;
1390 s->last_mv[0][1][1]= s->last_mv[0][0][1]= s->mv[0][0][1] = my;
1393 if(USES_LIST(mb_type, 1)){
1394 s->mv_dir |= MV_DIR_BACKWARD;
1396 mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1397 my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1398 s->last_mv[1][1][0]= s->last_mv[1][0][0]= s->mv[1][0][0] = mx;
1399 s->last_mv[1][1][1]= s->last_mv[1][0][1]= s->mv[1][0][1] = my;
1401 }else if(!IS_DIRECT(mb_type)){
1402 s->mv_type= MV_TYPE_FIELD;
1404 if(USES_LIST(mb_type, 0)){
1405 s->mv_dir = MV_DIR_FORWARD;
1408 mx = ff_h263_decode_motion(s, s->last_mv[0][i][0] , s->f_code);
1409 my = ff_h263_decode_motion(s, s->last_mv[0][i][1]/2, s->f_code);
1410 s->last_mv[0][i][0]= s->mv[0][i][0] = mx;
1411 s->last_mv[0][i][1]= (s->mv[0][i][1] = my)*2;
1415 if(USES_LIST(mb_type, 1)){
1416 s->mv_dir |= MV_DIR_BACKWARD;
1419 mx = ff_h263_decode_motion(s, s->last_mv[1][i][0] , s->b_code);
1420 my = ff_h263_decode_motion(s, s->last_mv[1][i][1]/2, s->b_code);
1421 s->last_mv[1][i][0]= s->mv[1][i][0] = mx;
1422 s->last_mv[1][i][1]= (s->mv[1][i][1] = my)*2;
1428 if(IS_DIRECT(mb_type)){
1429 if(IS_SKIP(mb_type))
1432 mx = ff_h263_decode_motion(s, 0, 1);
1433 my = ff_h263_decode_motion(s, 0, 1);
1436 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1437 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1439 s->current_picture.f.mb_type[xy] = mb_type;
1440 } else { /* I-Frame */
1442 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1444 av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1452 s->ac_pred = get_bits1(&s->gb);
1454 s->current_picture.f.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1456 s->current_picture.f.mb_type[xy] = MB_TYPE_INTRA;
1458 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1460 av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1463 cbp = (cbpc & 3) | (cbpy << 2);
1465 s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
1468 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1471 if(!s->progressive_sequence)
1472 s->interlaced_dct= get_bits1(&s->gb);
1474 s->dsp.clear_blocks(s->block[0]);
1475 /* decode each block */
1476 for (i = 0; i < 6; i++) {
1477 if (mpeg4_decode_block(s, block[i], i, cbp&32, 1, 0) < 0)
1484 /* decode each block */
1485 for (i = 0; i < 6; i++) {
1486 if (mpeg4_decode_block(s, block[i], i, cbp&32, 0, 0) < 0)
1492 /* per-MB end of slice check */
1493 if(s->codec_id==CODEC_ID_MPEG4){
1494 int next= mpeg4_is_resync(s);
1496 if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1498 } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1501 if(s->pict_type==AV_PICTURE_TYPE_B){
1502 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1503 ff_thread_await_progress(&s->next_picture_ptr->f,
1504 (s->mb_x + delta >= s->mb_width) ? FFMIN(s->mb_y+1, s->mb_height-1) : s->mb_y, 0);
1505 if (s->next_picture.f.mbskip_table[xy + delta])
1517 static int mpeg4_decode_gop_header(MpegEncContext * s, GetBitContext *gb){
1518 int hours, minutes, seconds;
1520 if(!show_bits(gb, 23)){
1521 av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1525 hours= get_bits(gb, 5);
1526 minutes= get_bits(gb, 6);
1528 seconds= get_bits(gb, 6);
1530 s->time_base= seconds + 60*(minutes + 60*hours);
1538 static int mpeg4_decode_profile_level(MpegEncContext * s, GetBitContext *gb){
1540 s->avctx->profile = get_bits(gb, 4);
1541 s->avctx->level = get_bits(gb, 4);
1543 // for Simple profile, level 0
1544 if (s->avctx->profile == 0 && s->avctx->level == 8) {
1545 s->avctx->level = 0;
1551 static int decode_vol_header(MpegEncContext *s, GetBitContext *gb){
1552 int width, height, vo_ver_id;
1555 skip_bits(gb, 1); /* random access */
1556 s->vo_type= get_bits(gb, 8);
1557 if (get_bits1(gb) != 0) { /* is_ol_id */
1558 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1559 skip_bits(gb, 3); /* vo_priority */
1563 s->aspect_ratio_info= get_bits(gb, 4);
1564 if(s->aspect_ratio_info == FF_ASPECT_EXTENDED){
1565 s->avctx->sample_aspect_ratio.num= get_bits(gb, 8); // par_width
1566 s->avctx->sample_aspect_ratio.den= get_bits(gb, 8); // par_height
1568 s->avctx->sample_aspect_ratio= ff_h263_pixel_aspect[s->aspect_ratio_info];
1571 if ((s->vol_control_parameters=get_bits1(gb))) { /* vol control parameter */
1572 int chroma_format= get_bits(gb, 2);
1573 if(chroma_format!=CHROMA_420){
1574 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1576 s->low_delay= get_bits1(gb);
1577 if(get_bits1(gb)){ /* vbv parameters */
1578 get_bits(gb, 15); /* first_half_bitrate */
1579 skip_bits1(gb); /* marker */
1580 get_bits(gb, 15); /* latter_half_bitrate */
1581 skip_bits1(gb); /* marker */
1582 get_bits(gb, 15); /* first_half_vbv_buffer_size */
1583 skip_bits1(gb); /* marker */
1584 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1585 get_bits(gb, 11); /* first_half_vbv_occupancy */
1586 skip_bits1(gb); /* marker */
1587 get_bits(gb, 15); /* latter_half_vbv_occupancy */
1588 skip_bits1(gb); /* marker */
1591 // set low delay flag only once the smartest? low delay detection won't be overriden
1592 if(s->picture_number==0)
1596 s->shape = get_bits(gb, 2); /* vol shape */
1597 if(s->shape != RECT_SHAPE) av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1598 if(s->shape == GRAY_SHAPE && vo_ver_id != 1){
1599 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1600 skip_bits(gb, 4); //video_object_layer_shape_extension
1603 check_marker(gb, "before time_increment_resolution");
1605 s->avctx->time_base.den = get_bits(gb, 16);
1606 if(!s->avctx->time_base.den){
1607 av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n");
1608 s->avctx->time_base.num = 0;
1612 s->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
1613 if (s->time_increment_bits < 1)
1614 s->time_increment_bits = 1;
1616 check_marker(gb, "before fixed_vop_rate");
1618 if (get_bits1(gb) != 0) { /* fixed_vop_rate */
1619 s->avctx->time_base.num = get_bits(gb, s->time_increment_bits);
1621 s->avctx->time_base.num = 1;
1625 if (s->shape != BIN_ONLY_SHAPE) {
1626 if (s->shape == RECT_SHAPE) {
1627 skip_bits1(gb); /* marker */
1628 width = get_bits(gb, 13);
1629 skip_bits1(gb); /* marker */
1630 height = get_bits(gb, 13);
1631 skip_bits1(gb); /* marker */
1632 if(width && height && !(s->width && s->codec_tag == AV_RL32("MP4S"))){ /* they should be non zero but who knows ... */
1638 s->progressive_sequence=
1639 s->progressive_frame= get_bits1(gb)^1;
1640 s->interlaced_dct=0;
1641 if(!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1642 av_log(s->avctx, AV_LOG_INFO, "MPEG4 OBMC not supported (very likely buggy encoder)\n"); /* OBMC Disable */
1643 if (vo_ver_id == 1) {
1644 s->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1646 s->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1648 if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1649 if(s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE){
1650 if(s->vol_sprite_usage==STATIC_SPRITE){
1651 s->sprite_width = get_bits(gb, 13);
1652 skip_bits1(gb); /* marker */
1653 s->sprite_height= get_bits(gb, 13);
1654 skip_bits1(gb); /* marker */
1655 s->sprite_left = get_bits(gb, 13);
1656 skip_bits1(gb); /* marker */
1657 s->sprite_top = get_bits(gb, 13);
1658 skip_bits1(gb); /* marker */
1660 s->num_sprite_warping_points= get_bits(gb, 6);
1661 if(s->num_sprite_warping_points > 3){
1662 av_log(s->avctx, AV_LOG_ERROR, "%d sprite_warping_points\n", s->num_sprite_warping_points);
1663 s->num_sprite_warping_points= 0;
1666 s->sprite_warping_accuracy = get_bits(gb, 2);
1667 s->sprite_brightness_change= get_bits1(gb);
1668 if(s->vol_sprite_usage==STATIC_SPRITE)
1669 s->low_latency_sprite= get_bits1(gb);
1671 // FIXME sadct disable bit if verid!=1 && shape not rect
1673 if (get_bits1(gb) == 1) { /* not_8_bit */
1674 s->quant_precision = get_bits(gb, 4); /* quant_precision */
1675 if(get_bits(gb, 4)!=8) av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n"); /* bits_per_pixel */
1676 if(s->quant_precision!=5) av_log(s->avctx, AV_LOG_ERROR, "quant precision %d\n", s->quant_precision);
1677 if(s->quant_precision<3 || s->quant_precision>9) {
1678 s->quant_precision = 5;
1681 s->quant_precision = 5;
1684 // FIXME a bunch of grayscale shape things
1686 if((s->mpeg_quant=get_bits1(gb))){ /* vol_quant_type */
1689 /* load default matrixes */
1690 for(i=0; i<64; i++){
1691 int j= s->dsp.idct_permutation[i];
1692 v= ff_mpeg4_default_intra_matrix[i];
1693 s->intra_matrix[j]= v;
1694 s->chroma_intra_matrix[j]= v;
1696 v= ff_mpeg4_default_non_intra_matrix[i];
1697 s->inter_matrix[j]= v;
1698 s->chroma_inter_matrix[j]= v;
1701 /* load custom intra matrix */
1704 for(i=0; i<64; i++){
1710 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1711 s->intra_matrix[j]= v;
1712 s->chroma_intra_matrix[j]= v;
1715 /* replicate last value */
1717 int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1718 s->intra_matrix[j]= last;
1719 s->chroma_intra_matrix[j]= last;
1723 /* load custom non intra matrix */
1726 for(i=0; i<64; i++){
1732 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1733 s->inter_matrix[j]= v;
1734 s->chroma_inter_matrix[j]= v;
1737 /* replicate last value */
1739 int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1740 s->inter_matrix[j]= last;
1741 s->chroma_inter_matrix[j]= last;
1745 // FIXME a bunch of grayscale shape things
1749 s->quarter_sample= get_bits1(gb);
1750 else s->quarter_sample=0;
1753 int pos= get_bits_count(gb);
1754 int estimation_method= get_bits(gb, 2);
1755 if(estimation_method<2){
1757 s->cplx_estimation_trash_i += 8*get_bits1(gb); //opaque
1758 s->cplx_estimation_trash_i += 8*get_bits1(gb); //transparent
1759 s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_cae
1760 s->cplx_estimation_trash_i += 8*get_bits1(gb); //inter_cae
1761 s->cplx_estimation_trash_i += 8*get_bits1(gb); //no_update
1762 s->cplx_estimation_trash_i += 8*get_bits1(gb); //upampling
1765 s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_blocks
1766 s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter_blocks
1767 s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter4v_blocks
1768 s->cplx_estimation_trash_i += 8*get_bits1(gb); //not coded blocks
1770 if(!check_marker(gb, "in complexity estimation part 1")){
1771 skip_bits_long(gb, pos - get_bits_count(gb));
1775 s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_coeffs
1776 s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_lines
1777 s->cplx_estimation_trash_i += 8*get_bits1(gb); //vlc_syms
1778 s->cplx_estimation_trash_i += 4*get_bits1(gb); //vlc_bits
1781 s->cplx_estimation_trash_p += 8*get_bits1(gb); //apm
1782 s->cplx_estimation_trash_p += 8*get_bits1(gb); //npm
1783 s->cplx_estimation_trash_b += 8*get_bits1(gb); //interpolate_mc_q
1784 s->cplx_estimation_trash_p += 8*get_bits1(gb); //forwback_mc_q
1785 s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel2
1786 s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel4
1788 if(!check_marker(gb, "in complexity estimation part 2")){
1789 skip_bits_long(gb, pos - get_bits_count(gb));
1792 if(estimation_method==1){
1793 s->cplx_estimation_trash_i += 8*get_bits1(gb); //sadct
1794 s->cplx_estimation_trash_p += 8*get_bits1(gb); //qpel
1797 av_log(s->avctx, AV_LOG_ERROR, "Invalid Complexity estimation method %d\n", estimation_method);
1800 s->cplx_estimation_trash_i=
1801 s->cplx_estimation_trash_p=
1802 s->cplx_estimation_trash_b= 0;
1805 s->resync_marker= !get_bits1(gb); /* resync_marker_disabled */
1807 s->data_partitioning= get_bits1(gb);
1808 if(s->data_partitioning){
1809 s->rvlc= get_bits1(gb);
1812 if(vo_ver_id != 1) {
1813 s->new_pred= get_bits1(gb);
1815 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
1816 skip_bits(gb, 2); /* requested upstream message type */
1817 skip_bits1(gb); /* newpred segment type */
1819 s->reduced_res_vop= get_bits1(gb);
1820 if(s->reduced_res_vop) av_log(s->avctx, AV_LOG_ERROR, "reduced resolution VOP not supported\n");
1824 s->reduced_res_vop= 0;
1827 s->scalability= get_bits1(gb);
1829 if (s->scalability) {
1830 GetBitContext bak= *gb;
1831 int h_sampling_factor_n;
1832 int h_sampling_factor_m;
1833 int v_sampling_factor_n;
1834 int v_sampling_factor_m;
1836 s->hierachy_type= get_bits1(gb);
1837 skip_bits(gb, 4); /* ref_layer_id */
1838 skip_bits1(gb); /* ref_layer_sampling_dir */
1839 h_sampling_factor_n= get_bits(gb, 5);
1840 h_sampling_factor_m= get_bits(gb, 5);
1841 v_sampling_factor_n= get_bits(gb, 5);
1842 v_sampling_factor_m= get_bits(gb, 5);
1843 s->enhancement_type= get_bits1(gb);
1845 if( h_sampling_factor_n==0 || h_sampling_factor_m==0
1846 || v_sampling_factor_n==0 || v_sampling_factor_m==0){
1847 /* illegal scalability header (VERY broken encoder),
1848 * trying to workaround */
1852 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
1854 // bin shape stuff FIXME
1858 if(s->avctx->debug&FF_DEBUG_PICT_INFO) {
1859 av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, %s%s\n",
1860 s->avctx->time_base.num, s->avctx->time_base.den,
1861 s->time_increment_bits,
1863 s->progressive_sequence,
1864 s->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
1865 s->data_partitioning ? "partition " : "", s->rvlc ? "rvlc " : ""
1873 * Decode the user data stuff in the header.
1874 * Also initializes divx/xvid/lavc_version/build.
1876 static int decode_user_data(MpegEncContext *s, GetBitContext *gb){
1880 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
1883 for(i=0; i<255 && get_bits_count(gb) < gb->size_in_bits; i++){
1884 if(show_bits(gb, 23) == 0) break;
1885 buf[i]= get_bits(gb, 8);
1889 /* divx detection */
1890 e=sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
1892 e=sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
1894 s->divx_version= ver;
1895 s->divx_build= build;
1896 s->divx_packed= e==3 && last=='p';
1897 if(s->divx_packed && !s->showed_packed_warning) {
1898 av_log(s->avctx, AV_LOG_WARNING, "Invalid and inefficient vfw-avi packed B frames detected\n");
1899 s->showed_packed_warning=1;
1903 /* libavcodec detection */
1904 e=sscanf(buf, "FFmpe%*[^b]b%d", &build)+3;
1906 e=sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
1908 e=sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3)+1;
1910 build= (ver<<16) + (ver2<<8) + ver3;
1913 if(strcmp(buf, "ffmpeg")==0){
1914 s->lavc_build= 4600;
1918 s->lavc_build= build;
1921 /* Xvid detection */
1922 e=sscanf(buf, "XviD%d", &build);
1924 s->xvid_build= build;
1930 static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
1931 int time_incr, time_increment;
1933 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
1934 if(s->pict_type==AV_PICTURE_TYPE_B && s->low_delay && s->vol_control_parameters==0 && !(s->flags & CODEC_FLAG_LOW_DELAY)){
1935 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n");
1939 s->partitioned_frame= s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_B;
1940 if(s->partitioned_frame)
1941 s->decode_mb= mpeg4_decode_partitioned_mb;
1943 s->decode_mb= mpeg4_decode_mb;
1946 while (get_bits1(gb) != 0)
1949 check_marker(gb, "before time_increment");
1951 if(s->time_increment_bits==0 || !(show_bits(gb, s->time_increment_bits+1)&1)){
1952 av_log(s->avctx, AV_LOG_ERROR, "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
1954 for(s->time_increment_bits=1 ;s->time_increment_bits<16; s->time_increment_bits++){
1955 if ( s->pict_type == AV_PICTURE_TYPE_P
1956 || (s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE)) {
1957 if((show_bits(gb, s->time_increment_bits+6)&0x37) == 0x30) break;
1959 if((show_bits(gb, s->time_increment_bits+5)&0x1F) == 0x18) break;
1962 av_log(s->avctx, AV_LOG_ERROR, "my guess is %d bits ;)\n",s->time_increment_bits);
1965 if(IS_3IV1) time_increment= get_bits1(gb); //FIXME investigate further
1966 else time_increment= get_bits(gb, s->time_increment_bits);
1968 if(s->pict_type!=AV_PICTURE_TYPE_B){
1969 s->last_time_base= s->time_base;
1970 s->time_base+= time_incr;
1971 s->time= s->time_base*s->avctx->time_base.den + time_increment;
1972 if(s->workaround_bugs&FF_BUG_UMP4){
1973 if(s->time < s->last_non_b_time){
1974 /* header is not mpeg-4-compatible, broken encoder,
1975 * trying to workaround */
1977 s->time+= s->avctx->time_base.den;
1980 s->pp_time= s->time - s->last_non_b_time;
1981 s->last_non_b_time= s->time;
1983 s->time= (s->last_time_base + time_incr)*s->avctx->time_base.den + time_increment;
1984 s->pb_time= s->pp_time - (s->last_non_b_time - s->time);
1985 if(s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0){
1986 /* messed up order, maybe after seeking? skipping current b-frame */
1987 return FRAME_SKIPPED;
1989 ff_mpeg4_init_direct_mv(s);
1991 if(s->t_frame==0) s->t_frame= s->pb_time;
1992 if(s->t_frame==0) s->t_frame=1; // 1/0 protection
1993 s->pp_field_time= ( ROUNDED_DIV(s->last_non_b_time, s->t_frame)
1994 - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
1995 s->pb_field_time= ( ROUNDED_DIV(s->time, s->t_frame)
1996 - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
1997 if(!s->progressive_sequence){
1998 if(s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1)
1999 return FRAME_SKIPPED;
2003 if(s->avctx->time_base.num)
2004 s->current_picture_ptr->f.pts = (s->time + s->avctx->time_base.num / 2) / s->avctx->time_base.num;
2006 s->current_picture_ptr->f.pts = AV_NOPTS_VALUE;
2007 if(s->avctx->debug&FF_DEBUG_PTS)
2008 av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n",
2009 s->current_picture_ptr->f.pts);
2011 check_marker(gb, "before vop_coded");
2014 if (get_bits1(gb) != 1){
2015 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
2016 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2017 return FRAME_SKIPPED;
2019 if (s->shape != BIN_ONLY_SHAPE && ( s->pict_type == AV_PICTURE_TYPE_P
2020 || (s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE))) {
2021 /* rounding type for motion estimation */
2022 s->no_rounding = get_bits1(gb);
2026 //FIXME reduced res stuff
2028 if (s->shape != RECT_SHAPE) {
2029 if (s->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2030 skip_bits(gb, 13); /* width */
2031 skip_bits1(gb); /* marker */
2032 skip_bits(gb, 13); /* height */
2033 skip_bits1(gb); /* marker */
2034 skip_bits(gb, 13); /* hor_spat_ref */
2035 skip_bits1(gb); /* marker */
2036 skip_bits(gb, 13); /* ver_spat_ref */
2038 skip_bits1(gb); /* change_CR_disable */
2040 if (get_bits1(gb) != 0) {
2041 skip_bits(gb, 8); /* constant_alpha_value */
2044 //FIXME complexity estimation stuff
2046 if (s->shape != BIN_ONLY_SHAPE) {
2047 skip_bits_long(gb, s->cplx_estimation_trash_i);
2048 if(s->pict_type != AV_PICTURE_TYPE_I)
2049 skip_bits_long(gb, s->cplx_estimation_trash_p);
2050 if(s->pict_type == AV_PICTURE_TYPE_B)
2051 skip_bits_long(gb, s->cplx_estimation_trash_b);
2053 if(get_bits_left(gb) < 3) {
2054 av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2057 s->intra_dc_threshold= ff_mpeg4_dc_threshold[ get_bits(gb, 3) ];
2058 if(!s->progressive_sequence){
2059 s->top_field_first= get_bits1(gb);
2060 s->alternate_scan= get_bits1(gb);
2062 s->alternate_scan= 0;
2065 if(s->alternate_scan){
2066 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
2067 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
2068 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2069 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2071 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
2072 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
2073 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2074 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2077 if(s->pict_type == AV_PICTURE_TYPE_S && (s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE)){
2078 if(mpeg4_decode_sprite_trajectory(s, gb) < 0)
2080 if(s->sprite_brightness_change) av_log(s->avctx, AV_LOG_ERROR, "sprite_brightness_change not supported\n");
2081 if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2084 if (s->shape != BIN_ONLY_SHAPE) {
2085 s->chroma_qscale= s->qscale = get_bits(gb, s->quant_precision);
2087 av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (qscale=0)\n");
2088 return -1; // makes no sense to continue, as there is nothing left from the image then
2091 if (s->pict_type != AV_PICTURE_TYPE_I) {
2092 s->f_code = get_bits(gb, 3); /* fcode_for */
2094 av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (f_code=0)\n");
2096 return -1; // makes no sense to continue, as the MV decoding will break very quickly
2101 if (s->pict_type == AV_PICTURE_TYPE_B) {
2102 s->b_code = get_bits(gb, 3);
2104 av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (b_code=0)\n");
2106 return -1; // makes no sense to continue, as the MV decoding will break very quickly
2111 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2112 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:%d tincr:%d\n",
2113 s->qscale, s->f_code, s->b_code,
2114 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")),
2115 gb->size_in_bits,s->progressive_sequence, s->alternate_scan, s->top_field_first,
2116 s->quarter_sample ? "q" : "h", s->data_partitioning, s->resync_marker, s->num_sprite_warping_points,
2117 s->sprite_warping_accuracy, 1-s->no_rounding, s->vo_type, s->vol_control_parameters ? " VOLC" : " ", s->intra_dc_threshold,
2118 s->cplx_estimation_trash_i, s->cplx_estimation_trash_p, s->cplx_estimation_trash_b,
2124 if(!s->scalability){
2125 if (s->shape!=RECT_SHAPE && s->pict_type!=AV_PICTURE_TYPE_I) {
2126 skip_bits1(gb); // vop shape coding type
2129 if(s->enhancement_type){
2130 int load_backward_shape= get_bits1(gb);
2131 if(load_backward_shape){
2132 av_log(s->avctx, AV_LOG_ERROR, "load backward shape isn't supported\n");
2135 skip_bits(gb, 2); //ref_select_code
2138 /* detect buggy encoders which don't set the low_delay flag (divx4/xvid/opendivx)*/
2139 // note we cannot detect divx5 without b-frames easily (although it's buggy too)
2140 if(s->vo_type==0 && s->vol_control_parameters==0 && s->divx_version==-1 && s->picture_number==0){
2141 av_log(s->avctx, AV_LOG_WARNING, "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2145 s->picture_number++; // better than pic number==0 always ;)
2147 s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table; //FIXME add short header support
2148 s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
2150 if(s->workaround_bugs&FF_BUG_EDGE){
2151 s->h_edge_pos= s->width;
2152 s->v_edge_pos= s->height;
2158 * Decode mpeg4 headers.
2159 * @return <0 if no VOP found (or a damaged one)
2160 * FRAME_SKIPPED if a not coded VOP is found
2161 * 0 if a VOP is found
2163 int ff_mpeg4_decode_picture_header(MpegEncContext * s, GetBitContext *gb)
2165 unsigned startcode, v;
2167 /* search next start code */
2170 if(s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630){
2172 if(get_bits(gb, 8) == 0xF0)
2178 if(get_bits_count(gb) >= gb->size_in_bits){
2179 if(gb->size_in_bits==8 && (s->divx_version>=0 || s->xvid_build>=0) || s->codec_tag == AV_RL32("QMP4")){
2180 av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
2181 return FRAME_SKIPPED; //divx bug
2183 return -1; //end of stream
2186 /* use the bits after the test */
2187 v = get_bits(gb, 8);
2188 startcode = ((startcode << 8) | v) & 0xffffffff;
2190 if((startcode&0xFFFFFF00) != 0x100)
2191 continue; //no startcode
2193 if(s->avctx->debug&FF_DEBUG_STARTCODE){
2194 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2195 if (startcode<=0x11F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2196 else if(startcode<=0x12F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2197 else if(startcode<=0x13F) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2198 else if(startcode<=0x15F) av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2199 else if(startcode<=0x1AF) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2200 else if(startcode==0x1B0) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2201 else if(startcode==0x1B1) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2202 else if(startcode==0x1B2) av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2203 else if(startcode==0x1B3) av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2204 else if(startcode==0x1B4) av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2205 else if(startcode==0x1B5) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2206 else if(startcode==0x1B6) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2207 else if(startcode==0x1B7) av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2208 else if(startcode==0x1B8) av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2209 else if(startcode==0x1B9) av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2210 else if(startcode==0x1BA) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2211 else if(startcode==0x1BB) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2212 else if(startcode==0x1BC) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2213 else if(startcode==0x1BD) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2214 else if(startcode==0x1BE) av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2215 else if(startcode==0x1BF) av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2216 else if(startcode==0x1C0) av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2217 else if(startcode==0x1C1) av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2218 else if(startcode==0x1C2) av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2219 else if(startcode==0x1C3) av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2220 else if(startcode<=0x1C5) av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2221 else if(startcode<=0x1FF) av_log(s->avctx, AV_LOG_DEBUG, "System start");
2222 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2225 if(startcode >= 0x120 && startcode <= 0x12F){
2226 if(decode_vol_header(s, gb) < 0)
2229 else if(startcode == USER_DATA_STARTCODE){
2230 decode_user_data(s, gb);
2232 else if(startcode == GOP_STARTCODE){
2233 mpeg4_decode_gop_header(s, gb);
2235 else if(startcode == VOS_STARTCODE){
2236 mpeg4_decode_profile_level(s, gb);
2238 else if(startcode == VOP_STARTCODE){
2246 if(s->flags& CODEC_FLAG_LOW_DELAY)
2248 s->avctx->has_b_frames= !s->low_delay;
2249 return decode_vop_header(s, gb);
2252 static av_cold int decode_init(AVCodecContext *avctx)
2254 MpegEncContext *s = avctx->priv_data;
2256 static int done = 0;
2263 if((ret=ff_h263_decode_init(avctx)) < 0)
2269 ff_init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
2270 ff_init_rl(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
2271 ff_init_rl(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
2272 INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
2273 INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
2274 INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
2275 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2276 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2277 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2278 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2279 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2280 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2281 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2282 &ff_sprite_trajectory_tab[0][1], 4, 2,
2283 &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2284 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2285 &ff_mb_type_b_tab[0][1], 2, 1,
2286 &ff_mb_type_b_tab[0][0], 2, 1, 16);
2290 s->low_delay = 0; //default, might be overriden in the vol header during header parsing
2291 s->decode_mb= mpeg4_decode_mb;
2292 s->time_increment_bits = 4; /* default value for broken headers */
2293 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
2298 static const AVProfile mpeg4_video_profiles[] = {
2299 { FF_PROFILE_MPEG4_SIMPLE, "Simple Profile" },
2300 { FF_PROFILE_MPEG4_SIMPLE_SCALABLE, "Simple Scalable Profile" },
2301 { FF_PROFILE_MPEG4_CORE, "Core Profile" },
2302 { FF_PROFILE_MPEG4_MAIN, "Main Profile" },
2303 { FF_PROFILE_MPEG4_N_BIT, "N-bit Profile" },
2304 { FF_PROFILE_MPEG4_SCALABLE_TEXTURE, "Scalable Texture Profile" },
2305 { FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION, "Simple Face Animation Profile" },
2306 { FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE, "Basic Animated Texture Profile" },
2307 { FF_PROFILE_MPEG4_HYBRID, "Hybrid Profile" },
2308 { FF_PROFILE_MPEG4_ADVANCED_REAL_TIME, "Advanced Real Time Simple Profile" },
2309 { FF_PROFILE_MPEG4_CORE_SCALABLE, "Code Scalable Profile" },
2310 { FF_PROFILE_MPEG4_ADVANCED_CODING, "Advanced Coding Profile" },
2311 { FF_PROFILE_MPEG4_ADVANCED_CORE, "Advanced Core Profile" },
2312 { FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" },
2313 { FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" },
2314 { FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" },
2315 { FF_PROFILE_UNKNOWN },
2318 static const AVOption mpeg4_options[] = {
2319 {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), FF_OPT_TYPE_INT, {.dbl = 0}, 0, 1, 0},
2320 {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), FF_OPT_TYPE_INT, {.dbl = 0}, 0, 1, 0},
2324 static const AVClass mpeg4_class = {
2325 "MPEG4 Video Decoder",
2326 av_default_item_name,
2328 LIBAVUTIL_VERSION_INT,
2331 static const AVClass mpeg4_vdpau_class = {
2332 "MPEG4 Video VDPAU Decoder",
2333 av_default_item_name,
2335 LIBAVUTIL_VERSION_INT,
2338 AVCodec ff_mpeg4_decoder = {
2340 .type = AVMEDIA_TYPE_VIDEO,
2341 .id = CODEC_ID_MPEG4,
2342 .priv_data_size = sizeof(MpegEncContext),
2343 .init = decode_init,
2344 .close = ff_h263_decode_end,
2345 .decode = ff_h263_decode_frame,
2346 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2347 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2348 CODEC_CAP_FRAME_THREADS,
2349 .flush = ff_mpeg_flush,
2351 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2352 .pix_fmts = ff_hwaccel_pixfmt_list_420,
2353 .profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
2354 .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_mpeg_update_thread_context),
2355 .priv_class = &mpeg4_class,
2359 #if CONFIG_MPEG4_VDPAU_DECODER
2360 AVCodec ff_mpeg4_vdpau_decoder = {
2361 .name = "mpeg4_vdpau",
2362 .type = AVMEDIA_TYPE_VIDEO,
2363 .id = CODEC_ID_MPEG4,
2364 .priv_data_size = sizeof(MpegEncContext),
2365 .init = decode_init,
2366 .close = ff_h263_decode_end,
2367 .decode = ff_h263_decode_frame,
2368 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2369 CODEC_CAP_HWACCEL_VDPAU,
2370 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2371 .pix_fmts = (const enum PixelFormat[]){ PIX_FMT_VDPAU_MPEG4,
2373 .priv_class = &mpeg4_vdpau_class,