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b1abb618efcda2b2cb02030b9cfab4945549841f
[libav.git] / libavcodec / mpeg4videodec.c
1 /*
2 * MPEG4 decoder.
3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
5 *
6 * This file is part of Libav.
7 *
8 * Libav 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.
12 *
13 * Libav 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.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include "mpegvideo.h"
24 #include "mpeg4video.h"
25 #include "h263.h"
26 #include "thread.h"
27
28 // The defines below define the number of bits that are read at once for
29 // reading vlc values. Changing these may improve speed and data cache needs
30 // be aware though that decreasing them may need the number of stages that is
31 // passed to get_vlc* to be increased.
32 #define SPRITE_TRAJ_VLC_BITS 6
33 #define DC_VLC_BITS 9
34 #define MB_TYPE_B_VLC_BITS 4
35
36
37 static VLC dc_lum, dc_chrom;
38 static VLC sprite_trajectory;
39 static VLC mb_type_b_vlc;
40
41 static const int mb_type_b_map[4]= {
42 MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
43 MB_TYPE_L0L1 | MB_TYPE_16x16,
44 MB_TYPE_L1 | MB_TYPE_16x16,
45 MB_TYPE_L0 | MB_TYPE_16x16,
46 };
47
48 /**
49 * predicts the ac.
50 * @param n block index (0-3 are luma, 4-5 are chroma)
51 * @param dir the ac prediction direction
52 */
53 void mpeg4_pred_ac(MpegEncContext * s, DCTELEM *block, int n,
54 int dir)
55 {
56 int i;
57 int16_t *ac_val, *ac_val1;
58 int8_t * const qscale_table = s->current_picture.f.qscale_table;
59
60 /* find prediction */
61 ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
62 ac_val1 = ac_val;
63 if (s->ac_pred) {
64 if (dir == 0) {
65 const int xy= s->mb_x-1 + s->mb_y*s->mb_stride;
66 /* left prediction */
67 ac_val -= 16;
68
69 if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){
70 /* same qscale */
71 for(i=1;i<8;i++) {
72 block[s->dsp.idct_permutation[i<<3]] += ac_val[i];
73 }
74 }else{
75 /* different qscale, we must rescale */
76 for(i=1;i<8;i++) {
77 block[s->dsp.idct_permutation[i<<3]] += ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale);
78 }
79 }
80 } else {
81 const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride;
82 /* top prediction */
83 ac_val -= 16 * s->block_wrap[n];
84
85 if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
86 /* same qscale */
87 for(i=1;i<8;i++) {
88 block[s->dsp.idct_permutation[i]] += ac_val[i + 8];
89 }
90 }else{
91 /* different qscale, we must rescale */
92 for(i=1;i<8;i++) {
93 block[s->dsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale);
94 }
95 }
96 }
97 }
98 /* left copy */
99 for(i=1;i<8;i++)
100 ac_val1[i ] = block[s->dsp.idct_permutation[i<<3]];
101
102 /* top copy */
103 for(i=1;i<8;i++)
104 ac_val1[8 + i] = block[s->dsp.idct_permutation[i ]];
105
106 }
107
108 /**
109 * check if the next stuff is a resync marker or the end.
110 * @return 0 if not
111 */
112 static inline int mpeg4_is_resync(MpegEncContext *s){
113 int bits_count= get_bits_count(&s->gb);
114 int v= show_bits(&s->gb, 16);
115
116 if(s->workaround_bugs&FF_BUG_NO_PADDING){
117 return 0;
118 }
119
120 while(v<=0xFF){
121 if(s->pict_type==AV_PICTURE_TYPE_B || (v>>(8-s->pict_type)!=1) || s->partitioned_frame)
122 break;
123 skip_bits(&s->gb, 8+s->pict_type);
124 bits_count+= 8+s->pict_type;
125 v= show_bits(&s->gb, 16);
126 }
127
128 if(bits_count + 8 >= s->gb.size_in_bits){
129 v>>=8;
130 v|= 0x7F >> (7-(bits_count&7));
131
132 if(v==0x7F)
133 return 1;
134 }else{
135 if(v == ff_mpeg4_resync_prefix[bits_count&7]){
136 int len;
137 GetBitContext gb= s->gb;
138
139 skip_bits(&s->gb, 1);
140 align_get_bits(&s->gb);
141
142 for(len=0; len<32; len++){
143 if(get_bits1(&s->gb)) break;
144 }
145
146 s->gb= gb;
147
148 if(len>=ff_mpeg4_get_video_packet_prefix_length(s))
149 return 1;
150 }
151 }
152 return 0;
153 }
154
155 static void mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb)
156 {
157 int i;
158 int a= 2<<s->sprite_warping_accuracy;
159 int rho= 3-s->sprite_warping_accuracy;
160 int r=16/a;
161 const int vop_ref[4][2]= {{0,0}, {s->width,0}, {0, s->height}, {s->width, s->height}}; // only true for rectangle shapes
162 int d[4][2]={{0,0}, {0,0}, {0,0}, {0,0}};
163 int sprite_ref[4][2];
164 int virtual_ref[2][2];
165 int w2, h2, w3, h3;
166 int alpha=0, beta=0;
167 int w= s->width;
168 int h= s->height;
169 int min_ab;
170
171 for(i=0; i<s->num_sprite_warping_points; i++){
172 int length;
173 int x=0, y=0;
174
175 length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
176 if(length){
177 x= get_xbits(gb, length);
178 }
179 if(!(s->divx_version==500 && s->divx_build==413)) skip_bits1(gb); /* marker bit */
180
181 length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
182 if(length){
183 y=get_xbits(gb, length);
184 }
185 skip_bits1(gb); /* marker bit */
186 s->sprite_traj[i][0]= d[i][0]= x;
187 s->sprite_traj[i][1]= d[i][1]= y;
188 }
189 for(; i<4; i++)
190 s->sprite_traj[i][0]= s->sprite_traj[i][1]= 0;
191
192 while((1<<alpha)<w) alpha++;
193 while((1<<beta )<h) beta++; // there seems to be a typo in the mpeg4 std for the definition of w' and h'
194 w2= 1<<alpha;
195 h2= 1<<beta;
196
197 // Note, the 4th point isn't used for GMC
198 if(s->divx_version==500 && s->divx_build==413){
199 sprite_ref[0][0]= a*vop_ref[0][0] + d[0][0];
200 sprite_ref[0][1]= a*vop_ref[0][1] + d[0][1];
201 sprite_ref[1][0]= a*vop_ref[1][0] + d[0][0] + d[1][0];
202 sprite_ref[1][1]= a*vop_ref[1][1] + d[0][1] + d[1][1];
203 sprite_ref[2][0]= a*vop_ref[2][0] + d[0][0] + d[2][0];
204 sprite_ref[2][1]= a*vop_ref[2][1] + d[0][1] + d[2][1];
205 } else {
206 sprite_ref[0][0]= (a>>1)*(2*vop_ref[0][0] + d[0][0]);
207 sprite_ref[0][1]= (a>>1)*(2*vop_ref[0][1] + d[0][1]);
208 sprite_ref[1][0]= (a>>1)*(2*vop_ref[1][0] + d[0][0] + d[1][0]);
209 sprite_ref[1][1]= (a>>1)*(2*vop_ref[1][1] + d[0][1] + d[1][1]);
210 sprite_ref[2][0]= (a>>1)*(2*vop_ref[2][0] + d[0][0] + d[2][0]);
211 sprite_ref[2][1]= (a>>1)*(2*vop_ref[2][1] + d[0][1] + d[2][1]);
212 }
213 /* sprite_ref[3][0]= (a>>1)*(2*vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
214 sprite_ref[3][1]= (a>>1)*(2*vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
215
216 // this is mostly identical to the mpeg4 std (and is totally unreadable because of that ...)
217 // perhaps it should be reordered to be more readable ...
218 // the idea behind this virtual_ref mess is to be able to use shifts later per pixel instead of divides
219 // so the distance between points is converted from w&h based to w2&h2 based which are of the 2^x form
220 virtual_ref[0][0]= 16*(vop_ref[0][0] + w2)
221 + ROUNDED_DIV(((w - w2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + w2*(r*sprite_ref[1][0] - 16*vop_ref[1][0])),w);
222 virtual_ref[0][1]= 16*vop_ref[0][1]
223 + ROUNDED_DIV(((w - w2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + w2*(r*sprite_ref[1][1] - 16*vop_ref[1][1])),w);
224 virtual_ref[1][0]= 16*vop_ref[0][0]
225 + ROUNDED_DIV(((h - h2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + h2*(r*sprite_ref[2][0] - 16*vop_ref[2][0])),h);
226 virtual_ref[1][1]= 16*(vop_ref[0][1] + h2)
227 + ROUNDED_DIV(((h - h2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + h2*(r*sprite_ref[2][1] - 16*vop_ref[2][1])),h);
228
229 switch(s->num_sprite_warping_points)
230 {
231 case 0:
232 s->sprite_offset[0][0]= 0;
233 s->sprite_offset[0][1]= 0;
234 s->sprite_offset[1][0]= 0;
235 s->sprite_offset[1][1]= 0;
236 s->sprite_delta[0][0]= a;
237 s->sprite_delta[0][1]= 0;
238 s->sprite_delta[1][0]= 0;
239 s->sprite_delta[1][1]= a;
240 s->sprite_shift[0]= 0;
241 s->sprite_shift[1]= 0;
242 break;
243 case 1: //GMC only
244 s->sprite_offset[0][0]= sprite_ref[0][0] - a*vop_ref[0][0];
245 s->sprite_offset[0][1]= sprite_ref[0][1] - a*vop_ref[0][1];
246 s->sprite_offset[1][0]= ((sprite_ref[0][0]>>1)|(sprite_ref[0][0]&1)) - a*(vop_ref[0][0]/2);
247 s->sprite_offset[1][1]= ((sprite_ref[0][1]>>1)|(sprite_ref[0][1]&1)) - a*(vop_ref[0][1]/2);
248 s->sprite_delta[0][0]= a;
249 s->sprite_delta[0][1]= 0;
250 s->sprite_delta[1][0]= 0;
251 s->sprite_delta[1][1]= a;
252 s->sprite_shift[0]= 0;
253 s->sprite_shift[1]= 0;
254 break;
255 case 2:
256 s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+rho))
257 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][0])
258 + ( r*sprite_ref[0][1] - virtual_ref[0][1])*(-vop_ref[0][1])
259 + (1<<(alpha+rho-1));
260 s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+rho))
261 + (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-vop_ref[0][0])
262 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][1])
263 + (1<<(alpha+rho-1));
264 s->sprite_offset[1][0]= ( (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][0] + 1)
265 +( r*sprite_ref[0][1] - virtual_ref[0][1])*(-2*vop_ref[0][1] + 1)
266 +2*w2*r*sprite_ref[0][0]
267 - 16*w2
268 + (1<<(alpha+rho+1)));
269 s->sprite_offset[1][1]= ( (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-2*vop_ref[0][0] + 1)
270 +(-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][1] + 1)
271 +2*w2*r*sprite_ref[0][1]
272 - 16*w2
273 + (1<<(alpha+rho+1)));
274 s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
275 s->sprite_delta[0][1]= (+r*sprite_ref[0][1] - virtual_ref[0][1]);
276 s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1]);
277 s->sprite_delta[1][1]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
278
279 s->sprite_shift[0]= alpha+rho;
280 s->sprite_shift[1]= alpha+rho+2;
281 break;
282 case 3:
283 min_ab= FFMIN(alpha, beta);
284 w3= w2>>min_ab;
285 h3= h2>>min_ab;
286 s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+beta+rho-min_ab))
287 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-vop_ref[0][0])
288 + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-vop_ref[0][1])
289 + (1<<(alpha+beta+rho-min_ab-1));
290 s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+beta+rho-min_ab))
291 + (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-vop_ref[0][0])
292 + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-vop_ref[0][1])
293 + (1<<(alpha+beta+rho-min_ab-1));
294 s->sprite_offset[1][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-2*vop_ref[0][0] + 1)
295 + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-2*vop_ref[0][1] + 1)
296 + 2*w2*h3*r*sprite_ref[0][0]
297 - 16*w2*h3
298 + (1<<(alpha+beta+rho-min_ab+1));
299 s->sprite_offset[1][1]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-2*vop_ref[0][0] + 1)
300 + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-2*vop_ref[0][1] + 1)
301 + 2*w2*h3*r*sprite_ref[0][1]
302 - 16*w2*h3
303 + (1<<(alpha+beta+rho-min_ab+1));
304 s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3;
305 s->sprite_delta[0][1]= (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3;
306 s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3;
307 s->sprite_delta[1][1]= (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3;
308
309 s->sprite_shift[0]= alpha + beta + rho - min_ab;
310 s->sprite_shift[1]= alpha + beta + rho - min_ab + 2;
311 break;
312 }
313 /* try to simplify the situation */
314 if( s->sprite_delta[0][0] == a<<s->sprite_shift[0]
315 && s->sprite_delta[0][1] == 0
316 && s->sprite_delta[1][0] == 0
317 && s->sprite_delta[1][1] == a<<s->sprite_shift[0])
318 {
319 s->sprite_offset[0][0]>>=s->sprite_shift[0];
320 s->sprite_offset[0][1]>>=s->sprite_shift[0];
321 s->sprite_offset[1][0]>>=s->sprite_shift[1];
322 s->sprite_offset[1][1]>>=s->sprite_shift[1];
323 s->sprite_delta[0][0]= a;
324 s->sprite_delta[0][1]= 0;
325 s->sprite_delta[1][0]= 0;
326 s->sprite_delta[1][1]= a;
327 s->sprite_shift[0]= 0;
328 s->sprite_shift[1]= 0;
329 s->real_sprite_warping_points=1;
330 }
331 else{
332 int shift_y= 16 - s->sprite_shift[0];
333 int shift_c= 16 - s->sprite_shift[1];
334 for(i=0; i<2; i++){
335 s->sprite_offset[0][i]<<= shift_y;
336 s->sprite_offset[1][i]<<= shift_c;
337 s->sprite_delta[0][i]<<= shift_y;
338 s->sprite_delta[1][i]<<= shift_y;
339 s->sprite_shift[i]= 16;
340 }
341 s->real_sprite_warping_points= s->num_sprite_warping_points;
342 }
343 }
344
345 /**
346 * decodes the next video packet.
347 * @return <0 if something went wrong
348 */
349 int mpeg4_decode_video_packet_header(MpegEncContext *s)
350 {
351 int mb_num_bits= av_log2(s->mb_num - 1) + 1;
352 int header_extension=0, mb_num, len;
353
354 /* is there enough space left for a video packet + header */
355 if( get_bits_count(&s->gb) > s->gb.size_in_bits-20) return -1;
356
357 for(len=0; len<32; len++){
358 if(get_bits1(&s->gb)) break;
359 }
360
361 if(len!=ff_mpeg4_get_video_packet_prefix_length(s)){
362 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
363 return -1;
364 }
365
366 if(s->shape != RECT_SHAPE){
367 header_extension= get_bits1(&s->gb);
368 //FIXME more stuff here
369 }
370
371 mb_num= get_bits(&s->gb, mb_num_bits);
372 if(mb_num>=s->mb_num){
373 av_log(s->avctx, AV_LOG_ERROR, "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
374 return -1;
375 }
376 if(s->pict_type == AV_PICTURE_TYPE_B){
377 int mb_x = 0, mb_y = 0;
378
379 while (s->next_picture.f.mbskip_table[s->mb_index2xy[mb_num]]) {
380 if (!mb_x) ff_thread_await_progress((AVFrame*)s->next_picture_ptr, mb_y++, 0);
381 mb_num++;
382 if (++mb_x == s->mb_width) mb_x = 0;
383 }
384 if(mb_num >= s->mb_num) return -1; // slice contains just skipped MBs which where already decoded
385 }
386
387 s->mb_x= mb_num % s->mb_width;
388 s->mb_y= mb_num / s->mb_width;
389
390 if(s->shape != BIN_ONLY_SHAPE){
391 int qscale= get_bits(&s->gb, s->quant_precision);
392 if(qscale)
393 s->chroma_qscale=s->qscale= qscale;
394 }
395
396 if(s->shape == RECT_SHAPE){
397 header_extension= get_bits1(&s->gb);
398 }
399 if(header_extension){
400 int time_incr=0;
401
402 while (get_bits1(&s->gb) != 0)
403 time_incr++;
404
405 check_marker(&s->gb, "before time_increment in video packed header");
406 skip_bits(&s->gb, s->time_increment_bits); /* time_increment */
407 check_marker(&s->gb, "before vop_coding_type in video packed header");
408
409 skip_bits(&s->gb, 2); /* vop coding type */
410 //FIXME not rect stuff here
411
412 if(s->shape != BIN_ONLY_SHAPE){
413 skip_bits(&s->gb, 3); /* intra dc vlc threshold */
414 //FIXME don't just ignore everything
415 if(s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
416 mpeg4_decode_sprite_trajectory(s, &s->gb);
417 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
418 }
419
420 //FIXME reduced res stuff here
421
422 if (s->pict_type != AV_PICTURE_TYPE_I) {
423 int f_code = get_bits(&s->gb, 3); /* fcode_for */
424 if(f_code==0){
425 av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (f_code=0)\n");
426 }
427 }
428 if (s->pict_type == AV_PICTURE_TYPE_B) {
429 int b_code = get_bits(&s->gb, 3);
430 if(b_code==0){
431 av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (b_code=0)\n");
432 }
433 }
434 }
435 }
436 //FIXME new-pred stuff
437
438 return 0;
439 }
440
441 /**
442 * gets the average motion vector for a GMC MB.
443 * @param n either 0 for the x component or 1 for y
444 * @return the average MV for a GMC MB
445 */
446 static inline int get_amv(MpegEncContext *s, int n){
447 int x, y, mb_v, sum, dx, dy, shift;
448 int len = 1 << (s->f_code + 4);
449 const int a= s->sprite_warping_accuracy;
450
451 if(s->workaround_bugs & FF_BUG_AMV)
452 len >>= s->quarter_sample;
453
454 if(s->real_sprite_warping_points==1){
455 if(s->divx_version==500 && s->divx_build==413)
456 sum= s->sprite_offset[0][n] / (1<<(a - s->quarter_sample));
457 else
458 sum= RSHIFT(s->sprite_offset[0][n]<<s->quarter_sample, a);
459 }else{
460 dx= s->sprite_delta[n][0];
461 dy= s->sprite_delta[n][1];
462 shift= s->sprite_shift[0];
463 if(n) dy -= 1<<(shift + a + 1);
464 else dx -= 1<<(shift + a + 1);
465 mb_v= s->sprite_offset[0][n] + dx*s->mb_x*16 + dy*s->mb_y*16;
466
467 sum=0;
468 for(y=0; y<16; y++){
469 int v;
470
471 v= mb_v + dy*y;
472 //XXX FIXME optimize
473 for(x=0; x<16; x++){
474 sum+= v>>shift;
475 v+= dx;
476 }
477 }
478 sum= RSHIFT(sum, a+8-s->quarter_sample);
479 }
480
481 if (sum < -len) sum= -len;
482 else if (sum >= len) sum= len-1;
483
484 return sum;
485 }
486
487 /**
488 * decodes the dc value.
489 * @param n block index (0-3 are luma, 4-5 are chroma)
490 * @param dir_ptr the prediction direction will be stored here
491 * @return the quantized dc
492 */
493 static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
494 {
495 int level, code;
496
497 if (n < 4)
498 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
499 else
500 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
501 if (code < 0 || code > 9 /* && s->nbit<9 */){
502 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
503 return -1;
504 }
505 if (code == 0) {
506 level = 0;
507 } else {
508 if(IS_3IV1){
509 if(code==1)
510 level= 2*get_bits1(&s->gb)-1;
511 else{
512 if(get_bits1(&s->gb))
513 level = get_bits(&s->gb, code-1) + (1<<(code-1));
514 else
515 level = -get_bits(&s->gb, code-1) - (1<<(code-1));
516 }
517 }else{
518 level = get_xbits(&s->gb, code);
519 }
520
521 if (code > 8){
522 if(get_bits1(&s->gb)==0){ /* marker */
523 if(s->error_recognition>=2){
524 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
525 return -1;
526 }
527 }
528 }
529 }
530
531 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
532 }
533
534 /**
535 * decodes first partition.
536 * @return number of MBs decoded or <0 if an error occurred
537 */
538 static int mpeg4_decode_partition_a(MpegEncContext *s){
539 int mb_num;
540 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
541
542 /* decode first partition */
543 mb_num=0;
544 s->first_slice_line=1;
545 for(; s->mb_y<s->mb_height; s->mb_y++){
546 ff_init_block_index(s);
547 for(; s->mb_x<s->mb_width; s->mb_x++){
548 const int xy= s->mb_x + s->mb_y*s->mb_stride;
549 int cbpc;
550 int dir=0;
551
552 mb_num++;
553 ff_update_block_index(s);
554 if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
555 s->first_slice_line=0;
556
557 if(s->pict_type==AV_PICTURE_TYPE_I){
558 int i;
559
560 do{
561 if(show_bits_long(&s->gb, 19)==DC_MARKER){
562 return mb_num-1;
563 }
564
565 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
566 if (cbpc < 0){
567 av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
568 return -1;
569 }
570 }while(cbpc == 8);
571
572 s->cbp_table[xy]= cbpc & 3;
573 s->current_picture.f.mb_type[xy] = MB_TYPE_INTRA;
574 s->mb_intra = 1;
575
576 if(cbpc & 4) {
577 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
578 }
579 s->current_picture.f.qscale_table[xy]= s->qscale;
580
581 s->mbintra_table[xy]= 1;
582 for(i=0; i<6; i++){
583 int dc_pred_dir;
584 int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
585 if(dc < 0){
586 av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
587 return -1;
588 }
589 dir<<=1;
590 if(dc_pred_dir) dir|=1;
591 }
592 s->pred_dir_table[xy]= dir;
593 }else{ /* P/S_TYPE */
594 int mx, my, pred_x, pred_y, bits;
595 int16_t * const mot_val = s->current_picture.f.motion_val[0][s->block_index[0]];
596 const int stride= s->b8_stride*2;
597
598 try_again:
599 bits= show_bits(&s->gb, 17);
600 if(bits==MOTION_MARKER){
601 return mb_num-1;
602 }
603 skip_bits1(&s->gb);
604 if(bits&0x10000){
605 /* skip mb */
606 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
607 s->current_picture.f.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
608 mx= get_amv(s, 0);
609 my= get_amv(s, 1);
610 }else{
611 s->current_picture.f.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
612 mx=my=0;
613 }
614 mot_val[0 ]= mot_val[2 ]=
615 mot_val[0+stride]= mot_val[2+stride]= mx;
616 mot_val[1 ]= mot_val[3 ]=
617 mot_val[1+stride]= mot_val[3+stride]= my;
618
619 if(s->mbintra_table[xy])
620 ff_clean_intra_table_entries(s);
621 continue;
622 }
623
624 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
625 if (cbpc < 0){
626 av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
627 return -1;
628 }
629 if(cbpc == 20)
630 goto try_again;
631
632 s->cbp_table[xy]= cbpc&(8+3); //8 is dquant
633
634 s->mb_intra = ((cbpc & 4) != 0);
635
636 if(s->mb_intra){
637 s->current_picture.f.mb_type[xy] = MB_TYPE_INTRA;
638 s->mbintra_table[xy]= 1;
639 mot_val[0 ]= mot_val[2 ]=
640 mot_val[0+stride]= mot_val[2+stride]= 0;
641 mot_val[1 ]= mot_val[3 ]=
642 mot_val[1+stride]= mot_val[3+stride]= 0;
643 }else{
644 if(s->mbintra_table[xy])
645 ff_clean_intra_table_entries(s);
646
647 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
648 s->mcsel= get_bits1(&s->gb);
649 else s->mcsel= 0;
650
651 if ((cbpc & 16) == 0) {
652 /* 16x16 motion prediction */
653
654 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
655 if(!s->mcsel){
656 mx = h263_decode_motion(s, pred_x, s->f_code);
657 if (mx >= 0xffff)
658 return -1;
659
660 my = h263_decode_motion(s, pred_y, s->f_code);
661 if (my >= 0xffff)
662 return -1;
663 s->current_picture.f.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
664 } else {
665 mx = get_amv(s, 0);
666 my = get_amv(s, 1);
667 s->current_picture.f.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
668 }
669
670 mot_val[0 ]= mot_val[2 ] =
671 mot_val[0+stride]= mot_val[2+stride]= mx;
672 mot_val[1 ]= mot_val[3 ]=
673 mot_val[1+stride]= mot_val[3+stride]= my;
674 } else {
675 int i;
676 s->current_picture.f.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
677 for(i=0;i<4;i++) {
678 int16_t *mot_val= h263_pred_motion(s, i, 0, &pred_x, &pred_y);
679 mx = h263_decode_motion(s, pred_x, s->f_code);
680 if (mx >= 0xffff)
681 return -1;
682
683 my = h263_decode_motion(s, pred_y, s->f_code);
684 if (my >= 0xffff)
685 return -1;
686 mot_val[0] = mx;
687 mot_val[1] = my;
688 }
689 }
690 }
691 }
692 }
693 s->mb_x= 0;
694 }
695
696 return mb_num;
697 }
698
699 /**
700 * decode second partition.
701 * @return <0 if an error occurred
702 */
703 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count){
704 int mb_num=0;
705 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
706
707 s->mb_x= s->resync_mb_x;
708 s->first_slice_line=1;
709 for(s->mb_y= s->resync_mb_y; mb_num < mb_count; s->mb_y++){
710 ff_init_block_index(s);
711 for(; mb_num < mb_count && s->mb_x<s->mb_width; s->mb_x++){
712 const int xy= s->mb_x + s->mb_y*s->mb_stride;
713
714 mb_num++;
715 ff_update_block_index(s);
716 if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
717 s->first_slice_line=0;
718
719 if(s->pict_type==AV_PICTURE_TYPE_I){
720 int ac_pred= get_bits1(&s->gb);
721 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
722 if(cbpy<0){
723 av_log(s->avctx, AV_LOG_ERROR, "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
724 return -1;
725 }
726
727 s->cbp_table[xy]|= cbpy<<2;
728 s->current_picture.f.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
729 }else{ /* P || S_TYPE */
730 if (IS_INTRA(s->current_picture.f.mb_type[xy])) {
731 int dir=0,i;
732 int ac_pred = get_bits1(&s->gb);
733 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
734
735 if(cbpy<0){
736 av_log(s->avctx, AV_LOG_ERROR, "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
737 return -1;
738 }
739
740 if(s->cbp_table[xy] & 8) {
741 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
742 }
743 s->current_picture.f.qscale_table[xy] = s->qscale;
744
745 for(i=0; i<6; i++){
746 int dc_pred_dir;
747 int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
748 if(dc < 0){
749 av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
750 return -1;
751 }
752 dir<<=1;
753 if(dc_pred_dir) dir|=1;
754 }
755 s->cbp_table[xy]&= 3; //remove dquant
756 s->cbp_table[xy]|= cbpy<<2;
757 s->current_picture.f.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
758 s->pred_dir_table[xy]= dir;
759 } else if (IS_SKIP(s->current_picture.f.mb_type[xy])) {
760 s->current_picture.f.qscale_table[xy] = s->qscale;
761 s->cbp_table[xy]= 0;
762 }else{
763 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
764
765 if(cbpy<0){
766 av_log(s->avctx, AV_LOG_ERROR, "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
767 return -1;
768 }
769
770 if(s->cbp_table[xy] & 8) {
771 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
772 }
773 s->current_picture.f.qscale_table[xy] = s->qscale;
774
775 s->cbp_table[xy]&= 3; //remove dquant
776 s->cbp_table[xy]|= (cbpy^0xf)<<2;
777 }
778 }
779 }
780 if(mb_num >= mb_count) return 0;
781 s->mb_x= 0;
782 }
783 return 0;
784 }
785
786 /**
787 * decodes the first & second partition
788 * @return <0 if error (and sets error type in the error_status_table)
789 */
790 int ff_mpeg4_decode_partitions(MpegEncContext *s)
791 {
792 int mb_num;
793 const int part_a_error= s->pict_type==AV_PICTURE_TYPE_I ? (DC_ERROR|MV_ERROR) : MV_ERROR;
794 const int part_a_end = s->pict_type==AV_PICTURE_TYPE_I ? (DC_END |MV_END) : MV_END;
795
796 mb_num= mpeg4_decode_partition_a(s);
797 if(mb_num<0){
798 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
799 return -1;
800 }
801
802 if(s->resync_mb_x + s->resync_mb_y*s->mb_width + mb_num > s->mb_num){
803 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
804 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
805 return -1;
806 }
807
808 s->mb_num_left= mb_num;
809
810 if(s->pict_type==AV_PICTURE_TYPE_I){
811 while(show_bits(&s->gb, 9) == 1)
812 skip_bits(&s->gb, 9);
813 if(get_bits_long(&s->gb, 19)!=DC_MARKER){
814 av_log(s->avctx, AV_LOG_ERROR, "marker missing after first I partition at %d %d\n", s->mb_x, s->mb_y);
815 return -1;
816 }
817 }else{
818 while(show_bits(&s->gb, 10) == 1)
819 skip_bits(&s->gb, 10);
820 if(get_bits(&s->gb, 17)!=MOTION_MARKER){
821 av_log(s->avctx, AV_LOG_ERROR, "marker missing after first P partition at %d %d\n", s->mb_x, s->mb_y);
822 return -1;
823 }
824 }
825 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, part_a_end);
826
827 if( mpeg4_decode_partition_b(s, mb_num) < 0){
828 if(s->pict_type==AV_PICTURE_TYPE_P)
829 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, DC_ERROR);
830 return -1;
831 }else{
832 if(s->pict_type==AV_PICTURE_TYPE_P)
833 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, DC_END);
834 }
835
836 return 0;
837 }
838
839 /**
840 * decodes a block.
841 * @return <0 if an error occurred
842 */
843 static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
844 int n, int coded, int intra, int rvlc)
845 {
846 int level, i, last, run;
847 int dc_pred_dir;
848 RLTable * rl;
849 RL_VLC_ELEM * rl_vlc;
850 const uint8_t * scan_table;
851 int qmul, qadd;
852
853 //Note intra & rvlc should be optimized away if this is inlined
854
855 if(intra) {
856 if(s->use_intra_dc_vlc){
857 /* DC coef */
858 if(s->partitioned_frame){
859 level = s->dc_val[0][ s->block_index[n] ];
860 if(n<4) level= FASTDIV((level + (s->y_dc_scale>>1)), s->y_dc_scale);
861 else level= FASTDIV((level + (s->c_dc_scale>>1)), s->c_dc_scale);
862 dc_pred_dir= (s->pred_dir_table[s->mb_x + s->mb_y*s->mb_stride]<<n)&32;
863 }else{
864 level = mpeg4_decode_dc(s, n, &dc_pred_dir);
865 if (level < 0)
866 return -1;
867 }
868 block[0] = level;
869 i = 0;
870 }else{
871 i = -1;
872 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
873 }
874 if (!coded)
875 goto not_coded;
876
877 if(rvlc){
878 rl = &rvlc_rl_intra;
879 rl_vlc = rvlc_rl_intra.rl_vlc[0];
880 }else{
881 rl = &ff_mpeg4_rl_intra;
882 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
883 }
884 if (s->ac_pred) {
885 if (dc_pred_dir == 0)
886 scan_table = s->intra_v_scantable.permutated; /* left */
887 else
888 scan_table = s->intra_h_scantable.permutated; /* top */
889 } else {
890 scan_table = s->intra_scantable.permutated;
891 }
892 qmul=1;
893 qadd=0;
894 } else {
895 i = -1;
896 if (!coded) {
897 s->block_last_index[n] = i;
898 return 0;
899 }
900 if(rvlc) rl = &rvlc_rl_inter;
901 else rl = &ff_h263_rl_inter;
902
903 scan_table = s->intra_scantable.permutated;
904
905 if(s->mpeg_quant){
906 qmul=1;
907 qadd=0;
908 if(rvlc){
909 rl_vlc = rvlc_rl_inter.rl_vlc[0];
910 }else{
911 rl_vlc = ff_h263_rl_inter.rl_vlc[0];
912 }
913 }else{
914 qmul = s->qscale << 1;
915 qadd = (s->qscale - 1) | 1;
916 if(rvlc){
917 rl_vlc = rvlc_rl_inter.rl_vlc[s->qscale];
918 }else{
919 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
920 }
921 }
922 }
923 {
924 OPEN_READER(re, &s->gb);
925 for(;;) {
926 UPDATE_CACHE(re, &s->gb);
927 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
928 if (level==0) {
929 /* escape */
930 if(rvlc){
931 if(SHOW_UBITS(re, &s->gb, 1)==0){
932 av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in rvlc esc\n");
933 return -1;
934 }; SKIP_CACHE(re, &s->gb, 1);
935
936 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
937 run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6);
938 SKIP_COUNTER(re, &s->gb, 1+1+6);
939 UPDATE_CACHE(re, &s->gb);
940
941 if(SHOW_UBITS(re, &s->gb, 1)==0){
942 av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in rvlc esc\n");
943 return -1;
944 }; SKIP_CACHE(re, &s->gb, 1);
945
946 level= SHOW_UBITS(re, &s->gb, 11); SKIP_CACHE(re, &s->gb, 11);
947
948 if(SHOW_UBITS(re, &s->gb, 5)!=0x10){
949 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
950 return -1;
951 }; SKIP_CACHE(re, &s->gb, 5);
952
953 level= level * qmul + qadd;
954 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_CACHE(re, &s->gb, 1);
955 SKIP_COUNTER(re, &s->gb, 1+11+5+1);
956
957 i+= run + 1;
958 if(last) i+=192;
959 }else{
960 int cache;
961 cache= GET_CACHE(re, &s->gb);
962
963 if(IS_3IV1)
964 cache ^= 0xC0000000;
965
966 if (cache&0x80000000) {
967 if (cache&0x40000000) {
968 /* third escape */
969 SKIP_CACHE(re, &s->gb, 2);
970 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
971 run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6);
972 SKIP_COUNTER(re, &s->gb, 2+1+6);
973 UPDATE_CACHE(re, &s->gb);
974
975 if(IS_3IV1){
976 level= SHOW_SBITS(re, &s->gb, 12); LAST_SKIP_BITS(re, &s->gb, 12);
977 }else{
978 if(SHOW_UBITS(re, &s->gb, 1)==0){
979 av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in 3. esc\n");
980 return -1;
981 }; SKIP_CACHE(re, &s->gb, 1);
982
983 level= SHOW_SBITS(re, &s->gb, 12); SKIP_CACHE(re, &s->gb, 12);
984
985 if(SHOW_UBITS(re, &s->gb, 1)==0){
986 av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in 3. esc\n");
987 return -1;
988 }; LAST_SKIP_CACHE(re, &s->gb, 1);
989
990 SKIP_COUNTER(re, &s->gb, 1+12+1);
991 }
992
993 #if 0
994 if(s->error_recognition >= FF_ER_COMPLIANT){
995 const int abs_level= FFABS(level);
996 if(abs_level<=MAX_LEVEL && run<=MAX_RUN){
997 const int run1= run - rl->max_run[last][abs_level] - 1;
998 if(abs_level <= rl->max_level[last][run]){
999 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1000 return -1;
1001 }
1002 if(s->error_recognition > FF_ER_COMPLIANT){
1003 if(abs_level <= rl->max_level[last][run]*2){
1004 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1005 return -1;
1006 }
1007 if(run1 >= 0 && abs_level <= rl->max_level[last][run1]){
1008 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1009 return -1;
1010 }
1011 }
1012 }
1013 }
1014 #endif
1015 if (level>0) level= level * qmul + qadd;
1016 else level= level * qmul - qadd;
1017
1018 if((unsigned)(level + 2048) > 4095){
1019 if(s->error_recognition > FF_ER_COMPLIANT){
1020 if(level > 2560 || level<-2560){
1021 av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc, qp=%d\n", s->qscale);
1022 return -1;
1023 }
1024 }
1025 level= level<0 ? -2048 : 2047;
1026 }
1027
1028 i+= run + 1;
1029 if(last) i+=192;
1030 } else {
1031 /* second escape */
1032 SKIP_BITS(re, &s->gb, 2);
1033 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1034 i+= run + rl->max_run[run>>7][level/qmul] +1; //FIXME opt indexing
1035 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1036 LAST_SKIP_BITS(re, &s->gb, 1);
1037 }
1038 } else {
1039 /* first escape */
1040 SKIP_BITS(re, &s->gb, 1);
1041 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1042 i+= run;
1043 level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
1044 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1045 LAST_SKIP_BITS(re, &s->gb, 1);
1046 }
1047 }
1048 } else {
1049 i+= run;
1050 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1051 LAST_SKIP_BITS(re, &s->gb, 1);
1052 }
1053 if (i > 62){
1054 i-= 192;
1055 if(i&(~63)){
1056 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1057 return -1;
1058 }
1059
1060 block[scan_table[i]] = level;
1061 break;
1062 }
1063
1064 block[scan_table[i]] = level;
1065 }
1066 CLOSE_READER(re, &s->gb);
1067 }
1068 not_coded:
1069 if (intra) {
1070 if(!s->use_intra_dc_vlc){
1071 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1072
1073 i -= i>>31; //if(i == -1) i=0;
1074 }
1075
1076 mpeg4_pred_ac(s, block, n, dc_pred_dir);
1077 if (s->ac_pred) {
1078 i = 63; /* XXX: not optimal */
1079 }
1080 }
1081 s->block_last_index[n] = i;
1082 return 0;
1083 }
1084
1085 /**
1086 * decode partition C of one MB.
1087 * @return <0 if an error occurred
1088 */
1089 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, DCTELEM block[6][64])
1090 {
1091 int cbp, mb_type;
1092 const int xy= s->mb_x + s->mb_y*s->mb_stride;
1093
1094 mb_type = s->current_picture.f.mb_type[xy];
1095 cbp = s->cbp_table[xy];
1096
1097 s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
1098
1099 if (s->current_picture.f.qscale_table[xy] != s->qscale) {
1100 ff_set_qscale(s, s->current_picture.f.qscale_table[xy]);
1101 }
1102
1103 if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type==AV_PICTURE_TYPE_S) {
1104 int i;
1105 for(i=0; i<4; i++){
1106 s->mv[0][i][0] = s->current_picture.f.motion_val[0][s->block_index[i]][0];
1107 s->mv[0][i][1] = s->current_picture.f.motion_val[0][s->block_index[i]][1];
1108 }
1109 s->mb_intra = IS_INTRA(mb_type);
1110
1111 if (IS_SKIP(mb_type)) {
1112 /* skip mb */
1113 for(i=0;i<6;i++)
1114 s->block_last_index[i] = -1;
1115 s->mv_dir = MV_DIR_FORWARD;
1116 s->mv_type = MV_TYPE_16X16;
1117 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
1118 s->mcsel=1;
1119 s->mb_skipped = 0;
1120 }else{
1121 s->mcsel=0;
1122 s->mb_skipped = 1;
1123 }
1124 }else if(s->mb_intra){
1125 s->ac_pred = IS_ACPRED(s->current_picture.f.mb_type[xy]);
1126 }else if(!s->mb_intra){
1127 // s->mcsel= 0; //FIXME do we need to init that
1128
1129 s->mv_dir = MV_DIR_FORWARD;
1130 if (IS_8X8(mb_type)) {
1131 s->mv_type = MV_TYPE_8X8;
1132 } else {
1133 s->mv_type = MV_TYPE_16X16;
1134 }
1135 }
1136 } else { /* I-Frame */
1137 s->mb_intra = 1;
1138 s->ac_pred = IS_ACPRED(s->current_picture.f.mb_type[xy]);
1139 }
1140
1141 if (!IS_SKIP(mb_type)) {
1142 int i;
1143 s->dsp.clear_blocks(s->block[0]);
1144 /* decode each block */
1145 for (i = 0; i < 6; i++) {
1146 if(mpeg4_decode_block(s, block[i], i, cbp&32, s->mb_intra, s->rvlc) < 0){
1147 av_log(s->avctx, AV_LOG_ERROR, "texture corrupted at %d %d %d\n", s->mb_x, s->mb_y, s->mb_intra);
1148 return -1;
1149 }
1150 cbp+=cbp;
1151 }
1152 }
1153
1154 /* per-MB end of slice check */
1155
1156 if(--s->mb_num_left <= 0){
1157 if(mpeg4_is_resync(s))
1158 return SLICE_END;
1159 else
1160 return SLICE_NOEND;
1161 }else{
1162 if(mpeg4_is_resync(s)){
1163 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1164 if(s->cbp_table[xy+delta])
1165 return SLICE_END;
1166 }
1167 return SLICE_OK;
1168 }
1169 }
1170
1171 static int mpeg4_decode_mb(MpegEncContext *s,
1172 DCTELEM block[6][64])
1173 {
1174 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1175 int16_t *mot_val;
1176 static int8_t quant_tab[4] = { -1, -2, 1, 2 };
1177 const int xy= s->mb_x + s->mb_y * s->mb_stride;
1178
1179 assert(s->h263_pred);
1180
1181 if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type==AV_PICTURE_TYPE_S) {
1182 do{
1183 if (get_bits1(&s->gb)) {
1184 /* skip mb */
1185 s->mb_intra = 0;
1186 for(i=0;i<6;i++)
1187 s->block_last_index[i] = -1;
1188 s->mv_dir = MV_DIR_FORWARD;
1189 s->mv_type = MV_TYPE_16X16;
1190 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
1191 s->current_picture.f.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
1192 s->mcsel=1;
1193 s->mv[0][0][0]= get_amv(s, 0);
1194 s->mv[0][0][1]= get_amv(s, 1);
1195
1196 s->mb_skipped = 0;
1197 }else{
1198 s->current_picture.f.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
1199 s->mcsel=0;
1200 s->mv[0][0][0] = 0;
1201 s->mv[0][0][1] = 0;
1202 s->mb_skipped = 1;
1203 }
1204 goto end;
1205 }
1206 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1207 if (cbpc < 0){
1208 av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1209 return -1;
1210 }
1211 }while(cbpc == 20);
1212
1213 s->dsp.clear_blocks(s->block[0]);
1214 dquant = cbpc & 8;
1215 s->mb_intra = ((cbpc & 4) != 0);
1216 if (s->mb_intra) goto intra;
1217
1218 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
1219 s->mcsel= get_bits1(&s->gb);
1220 else s->mcsel= 0;
1221 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1222
1223 cbp = (cbpc & 3) | (cbpy << 2);
1224 if (dquant) {
1225 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1226 }
1227 if((!s->progressive_sequence) && (cbp || (s->workaround_bugs&FF_BUG_XVID_ILACE)))
1228 s->interlaced_dct= get_bits1(&s->gb);
1229
1230 s->mv_dir = MV_DIR_FORWARD;
1231 if ((cbpc & 16) == 0) {
1232 if(s->mcsel){
1233 s->current_picture.f.mb_type[xy] = MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
1234 /* 16x16 global motion prediction */
1235 s->mv_type = MV_TYPE_16X16;
1236 mx= get_amv(s, 0);
1237 my= get_amv(s, 1);
1238 s->mv[0][0][0] = mx;
1239 s->mv[0][0][1] = my;
1240 }else if((!s->progressive_sequence) && get_bits1(&s->gb)){
1241 s->current_picture.f.mb_type[xy] = MB_TYPE_16x8 | MB_TYPE_L0 | MB_TYPE_INTERLACED;
1242 /* 16x8 field motion prediction */
1243 s->mv_type= MV_TYPE_FIELD;
1244
1245 s->field_select[0][0]= get_bits1(&s->gb);
1246 s->field_select[0][1]= get_bits1(&s->gb);
1247
1248 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1249
1250 for(i=0; i<2; i++){
1251 mx = h263_decode_motion(s, pred_x, s->f_code);
1252 if (mx >= 0xffff)
1253 return -1;
1254
1255 my = h263_decode_motion(s, pred_y/2, s->f_code);
1256 if (my >= 0xffff)
1257 return -1;
1258
1259 s->mv[0][i][0] = mx;
1260 s->mv[0][i][1] = my;
1261 }
1262 }else{
1263 s->current_picture.f.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1264 /* 16x16 motion prediction */
1265 s->mv_type = MV_TYPE_16X16;
1266 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1267 mx = h263_decode_motion(s, pred_x, s->f_code);
1268
1269 if (mx >= 0xffff)
1270 return -1;
1271
1272 my = h263_decode_motion(s, pred_y, s->f_code);
1273
1274 if (my >= 0xffff)
1275 return -1;
1276 s->mv[0][0][0] = mx;
1277 s->mv[0][0][1] = my;
1278 }
1279 } else {
1280 s->current_picture.f.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1281 s->mv_type = MV_TYPE_8X8;
1282 for(i=0;i<4;i++) {
1283 mot_val = h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1284 mx = h263_decode_motion(s, pred_x, s->f_code);
1285 if (mx >= 0xffff)
1286 return -1;
1287
1288 my = h263_decode_motion(s, pred_y, s->f_code);
1289 if (my >= 0xffff)
1290 return -1;
1291 s->mv[0][i][0] = mx;
1292 s->mv[0][i][1] = my;
1293 mot_val[0] = mx;
1294 mot_val[1] = my;
1295 }
1296 }
1297 } else if(s->pict_type==AV_PICTURE_TYPE_B) {
1298 int modb1; // first bit of modb
1299 int modb2; // second bit of modb
1300 int mb_type;
1301
1302 s->mb_intra = 0; //B-frames never contain intra blocks
1303 s->mcsel=0; // ... true gmc blocks
1304
1305 if(s->mb_x==0){
1306 for(i=0; i<2; i++){
1307 s->last_mv[i][0][0]=
1308 s->last_mv[i][0][1]=
1309 s->last_mv[i][1][0]=
1310 s->last_mv[i][1][1]= 0;
1311 }
1312
1313 ff_thread_await_progress((AVFrame*)s->next_picture_ptr, s->mb_y, 0);
1314 }
1315
1316 /* if we skipped it in the future P Frame than skip it now too */
1317 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
1318
1319 if(s->mb_skipped){
1320 /* skip mb */
1321 for(i=0;i<6;i++)
1322 s->block_last_index[i] = -1;
1323
1324 s->mv_dir = MV_DIR_FORWARD;
1325 s->mv_type = MV_TYPE_16X16;
1326 s->mv[0][0][0] = 0;
1327 s->mv[0][0][1] = 0;
1328 s->mv[1][0][0] = 0;
1329 s->mv[1][0][1] = 0;
1330 s->current_picture.f.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
1331 goto end;
1332 }
1333
1334 modb1= get_bits1(&s->gb);
1335 if(modb1){
1336 mb_type= MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1; //like MB_TYPE_B_DIRECT but no vectors coded
1337 cbp=0;
1338 }else{
1339 modb2= get_bits1(&s->gb);
1340 mb_type= get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1341 if(mb_type<0){
1342 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1343 return -1;
1344 }
1345 mb_type= mb_type_b_map[ mb_type ];
1346 if(modb2) cbp= 0;
1347 else{
1348 s->dsp.clear_blocks(s->block[0]);
1349 cbp= get_bits(&s->gb, 6);
1350 }
1351
1352 if ((!IS_DIRECT(mb_type)) && cbp) {
1353 if(get_bits1(&s->gb)){
1354 ff_set_qscale(s, s->qscale + get_bits1(&s->gb)*4 - 2);
1355 }
1356 }
1357
1358 if(!s->progressive_sequence){
1359 if(cbp)
1360 s->interlaced_dct= get_bits1(&s->gb);
1361
1362 if(!IS_DIRECT(mb_type) && get_bits1(&s->gb)){
1363 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1364 mb_type &= ~MB_TYPE_16x16;
1365
1366 if(USES_LIST(mb_type, 0)){
1367 s->field_select[0][0]= get_bits1(&s->gb);
1368 s->field_select[0][1]= get_bits1(&s->gb);
1369 }
1370 if(USES_LIST(mb_type, 1)){
1371 s->field_select[1][0]= get_bits1(&s->gb);
1372 s->field_select[1][1]= get_bits1(&s->gb);
1373 }
1374 }
1375 }
1376
1377 s->mv_dir = 0;
1378 if((mb_type & (MB_TYPE_DIRECT2|MB_TYPE_INTERLACED)) == 0){
1379 s->mv_type= MV_TYPE_16X16;
1380
1381 if(USES_LIST(mb_type, 0)){
1382 s->mv_dir = MV_DIR_FORWARD;
1383
1384 mx = h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1385 my = h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1386 s->last_mv[0][1][0]= s->last_mv[0][0][0]= s->mv[0][0][0] = mx;
1387 s->last_mv[0][1][1]= s->last_mv[0][0][1]= s->mv[0][0][1] = my;
1388 }
1389
1390 if(USES_LIST(mb_type, 1)){
1391 s->mv_dir |= MV_DIR_BACKWARD;
1392
1393 mx = h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1394 my = h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1395 s->last_mv[1][1][0]= s->last_mv[1][0][0]= s->mv[1][0][0] = mx;
1396 s->last_mv[1][1][1]= s->last_mv[1][0][1]= s->mv[1][0][1] = my;
1397 }
1398 }else if(!IS_DIRECT(mb_type)){
1399 s->mv_type= MV_TYPE_FIELD;
1400
1401 if(USES_LIST(mb_type, 0)){
1402 s->mv_dir = MV_DIR_FORWARD;
1403
1404 for(i=0; i<2; i++){
1405 mx = h263_decode_motion(s, s->last_mv[0][i][0] , s->f_code);
1406 my = h263_decode_motion(s, s->last_mv[0][i][1]/2, s->f_code);
1407 s->last_mv[0][i][0]= s->mv[0][i][0] = mx;
1408 s->last_mv[0][i][1]= (s->mv[0][i][1] = my)*2;
1409 }
1410 }
1411
1412 if(USES_LIST(mb_type, 1)){
1413 s->mv_dir |= MV_DIR_BACKWARD;
1414
1415 for(i=0; i<2; i++){
1416 mx = h263_decode_motion(s, s->last_mv[1][i][0] , s->b_code);
1417 my = h263_decode_motion(s, s->last_mv[1][i][1]/2, s->b_code);
1418 s->last_mv[1][i][0]= s->mv[1][i][0] = mx;
1419 s->last_mv[1][i][1]= (s->mv[1][i][1] = my)*2;
1420 }
1421 }
1422 }
1423 }
1424
1425 if(IS_DIRECT(mb_type)){
1426 if(IS_SKIP(mb_type))
1427 mx=my=0;
1428 else{
1429 mx = h263_decode_motion(s, 0, 1);
1430 my = h263_decode_motion(s, 0, 1);
1431 }
1432
1433 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1434 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1435 }
1436 s->current_picture.f.mb_type[xy] = mb_type;
1437 } else { /* I-Frame */
1438 do{
1439 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1440 if (cbpc < 0){
1441 av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1442 return -1;
1443 }
1444 }while(cbpc == 8);
1445
1446 dquant = cbpc & 4;
1447 s->mb_intra = 1;
1448 intra:
1449 s->ac_pred = get_bits1(&s->gb);
1450 if(s->ac_pred)
1451 s->current_picture.f.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1452 else
1453 s->current_picture.f.mb_type[xy] = MB_TYPE_INTRA;
1454
1455 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1456 if(cbpy<0){
1457 av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1458 return -1;
1459 }
1460 cbp = (cbpc & 3) | (cbpy << 2);
1461
1462 s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
1463
1464 if (dquant) {
1465 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1466 }
1467
1468 if(!s->progressive_sequence)
1469 s->interlaced_dct= get_bits1(&s->gb);
1470
1471 s->dsp.clear_blocks(s->block[0]);
1472 /* decode each block */
1473 for (i = 0; i < 6; i++) {
1474 if (mpeg4_decode_block(s, block[i], i, cbp&32, 1, 0) < 0)
1475 return -1;
1476 cbp+=cbp;
1477 }
1478 goto end;
1479 }
1480
1481 /* decode each block */
1482 for (i = 0; i < 6; i++) {
1483 if (mpeg4_decode_block(s, block[i], i, cbp&32, 0, 0) < 0)
1484 return -1;
1485 cbp+=cbp;
1486 }
1487 end:
1488
1489 /* per-MB end of slice check */
1490 if(s->codec_id==CODEC_ID_MPEG4){
1491 if(mpeg4_is_resync(s)){
1492 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1493
1494 if (s->pict_type == AV_PICTURE_TYPE_B && s->next_picture.f.mbskip_table[xy + delta]) {
1495 ff_thread_await_progress((AVFrame*)s->next_picture_ptr,
1496 (s->mb_x + delta >= s->mb_width) ? FFMIN(s->mb_y+1, s->mb_height-1) : s->mb_y, 0);
1497 }
1498
1499 if (s->pict_type == AV_PICTURE_TYPE_B && s->next_picture.f.mbskip_table[xy + delta])
1500 return SLICE_OK;
1501 return SLICE_END;
1502 }
1503 }
1504
1505 return SLICE_OK;
1506 }
1507
1508
1509 static int mpeg4_decode_gop_header(MpegEncContext * s, GetBitContext *gb){
1510 int hours, minutes, seconds;
1511 unsigned time_code = show_bits(gb, 18);
1512
1513 if (time_code & 0x40) { /* marker_bit */
1514 hours = time_code >> 13;
1515 minutes = time_code >> 7 & 0x3f;
1516 seconds = time_code & 0x3f;
1517 s->time_base = seconds + 60*(minutes + 60*hours);
1518 skip_bits(gb, 20); /* time_code, closed_gov, broken_link */
1519 } else {
1520 av_log(s->avctx, AV_LOG_WARNING, "GOP header missing marker_bit\n");
1521 }
1522
1523 return 0;
1524 }
1525
1526 static int mpeg4_decode_profile_level(MpegEncContext * s, GetBitContext *gb){
1527 int profile_and_level_indication;
1528
1529 profile_and_level_indication = get_bits(gb, 8);
1530
1531 s->avctx->profile = (profile_and_level_indication & 0xf0) >> 4;
1532 s->avctx->level = (profile_and_level_indication & 0x0f);
1533
1534 // for Simple profile, level 0
1535 if (s->avctx->profile == 0 && s->avctx->level == 8) {
1536 s->avctx->level = 0;
1537 }
1538
1539 return 0;
1540 }
1541
1542 static int decode_vol_header(MpegEncContext *s, GetBitContext *gb){
1543 int width, height, vo_ver_id;
1544
1545 /* vol header */
1546 skip_bits(gb, 1); /* random access */
1547 s->vo_type= get_bits(gb, 8);
1548 if (get_bits1(gb) != 0) { /* is_ol_id */
1549 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1550 skip_bits(gb, 3); /* vo_priority */
1551 } else {
1552 vo_ver_id = 1;
1553 }
1554 s->aspect_ratio_info= get_bits(gb, 4);
1555 if(s->aspect_ratio_info == FF_ASPECT_EXTENDED){
1556 s->avctx->sample_aspect_ratio.num= get_bits(gb, 8); // par_width
1557 s->avctx->sample_aspect_ratio.den= get_bits(gb, 8); // par_height
1558 }else{
1559 s->avctx->sample_aspect_ratio= ff_h263_pixel_aspect[s->aspect_ratio_info];
1560 }
1561
1562 if ((s->vol_control_parameters=get_bits1(gb))) { /* vol control parameter */
1563 int chroma_format= get_bits(gb, 2);
1564 if(chroma_format!=CHROMA_420){
1565 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1566 }
1567 s->low_delay= get_bits1(gb);
1568 if(get_bits1(gb)){ /* vbv parameters */
1569 get_bits(gb, 15); /* first_half_bitrate */
1570 skip_bits1(gb); /* marker */
1571 get_bits(gb, 15); /* latter_half_bitrate */
1572 skip_bits1(gb); /* marker */
1573 get_bits(gb, 15); /* first_half_vbv_buffer_size */
1574 skip_bits1(gb); /* marker */
1575 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1576 get_bits(gb, 11); /* first_half_vbv_occupancy */
1577 skip_bits1(gb); /* marker */
1578 get_bits(gb, 15); /* latter_half_vbv_occupancy */
1579 skip_bits1(gb); /* marker */
1580 }
1581 }else{
1582 // set low delay flag only once the smartest? low delay detection won't be overriden
1583 if(s->picture_number==0)
1584 s->low_delay=0;
1585 }
1586
1587 s->shape = get_bits(gb, 2); /* vol shape */
1588 if(s->shape != RECT_SHAPE) av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1589 if(s->shape == GRAY_SHAPE && vo_ver_id != 1){
1590 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1591 skip_bits(gb, 4); //video_object_layer_shape_extension
1592 }
1593
1594 check_marker(gb, "before time_increment_resolution");
1595
1596 s->avctx->time_base.den = get_bits(gb, 16);
1597 if(!s->avctx->time_base.den){
1598 av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n");
1599 s->avctx->time_base.num = 0;
1600 return -1;
1601 }
1602
1603 s->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
1604 if (s->time_increment_bits < 1)
1605 s->time_increment_bits = 1;
1606
1607 check_marker(gb, "before fixed_vop_rate");
1608
1609 if (get_bits1(gb) != 0) { /* fixed_vop_rate */
1610 s->avctx->time_base.num = get_bits(gb, s->time_increment_bits);
1611 }else
1612 s->avctx->time_base.num = 1;
1613
1614 s->t_frame=0;
1615
1616 if (s->shape != BIN_ONLY_SHAPE) {
1617 if (s->shape == RECT_SHAPE) {
1618 skip_bits1(gb); /* marker */
1619 width = get_bits(gb, 13);
1620 skip_bits1(gb); /* marker */
1621 height = get_bits(gb, 13);
1622 skip_bits1(gb); /* marker */
1623 if(width && height && !(s->width && s->codec_tag == AV_RL32("MP4S"))){ /* they should be non zero but who knows ... */
1624 s->width = width;
1625 s->height = height;
1626 }
1627 }
1628
1629 s->progressive_sequence=
1630 s->progressive_frame= get_bits1(gb)^1;
1631 s->interlaced_dct=0;
1632 if(!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1633 av_log(s->avctx, AV_LOG_INFO, "MPEG4 OBMC not supported (very likely buggy encoder)\n"); /* OBMC Disable */
1634 if (vo_ver_id == 1) {
1635 s->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1636 } else {
1637 s->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1638 }
1639 if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1640 if(s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE){
1641 if(s->vol_sprite_usage==STATIC_SPRITE){
1642 s->sprite_width = get_bits(gb, 13);
1643 skip_bits1(gb); /* marker */
1644 s->sprite_height= get_bits(gb, 13);
1645 skip_bits1(gb); /* marker */
1646 s->sprite_left = get_bits(gb, 13);
1647 skip_bits1(gb); /* marker */
1648 s->sprite_top = get_bits(gb, 13);
1649 skip_bits1(gb); /* marker */
1650 }
1651 s->num_sprite_warping_points= get_bits(gb, 6);
1652 if(s->num_sprite_warping_points > 3){
1653 av_log(s->avctx, AV_LOG_ERROR, "%d sprite_warping_points\n", s->num_sprite_warping_points);
1654 s->num_sprite_warping_points= 0;
1655 return -1;
1656 }
1657 s->sprite_warping_accuracy = get_bits(gb, 2);
1658 s->sprite_brightness_change= get_bits1(gb);
1659 if(s->vol_sprite_usage==STATIC_SPRITE)
1660 s->low_latency_sprite= get_bits1(gb);
1661 }
1662 // FIXME sadct disable bit if verid!=1 && shape not rect
1663
1664 if (get_bits1(gb) == 1) { /* not_8_bit */
1665 s->quant_precision = get_bits(gb, 4); /* quant_precision */
1666 if(get_bits(gb, 4)!=8) av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n"); /* bits_per_pixel */
1667 if(s->quant_precision!=5) av_log(s->avctx, AV_LOG_ERROR, "quant precision %d\n", s->quant_precision);
1668 } else {
1669 s->quant_precision = 5;
1670 }
1671
1672 // FIXME a bunch of grayscale shape things
1673
1674 if((s->mpeg_quant=get_bits1(gb))){ /* vol_quant_type */
1675 int i, v;
1676
1677 /* load default matrixes */
1678 for(i=0; i<64; i++){
1679 int j= s->dsp.idct_permutation[i];
1680 v= ff_mpeg4_default_intra_matrix[i];
1681 s->intra_matrix[j]= v;
1682 s->chroma_intra_matrix[j]= v;
1683
1684 v= ff_mpeg4_default_non_intra_matrix[i];
1685 s->inter_matrix[j]= v;
1686 s->chroma_inter_matrix[j]= v;
1687 }
1688
1689 /* load custom intra matrix */
1690 if(get_bits1(gb)){
1691 int last=0;
1692 for(i=0; i<64; i++){
1693 int j;
1694 v= get_bits(gb, 8);
1695 if(v==0) break;
1696
1697 last= v;
1698 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1699 s->intra_matrix[j]= v;
1700 s->chroma_intra_matrix[j]= v;
1701 }
1702
1703 /* replicate last value */
1704 for(; i<64; i++){
1705 int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1706 s->intra_matrix[j]= last;
1707 s->chroma_intra_matrix[j]= last;
1708 }
1709 }
1710
1711 /* load custom non intra matrix */
1712 if(get_bits1(gb)){
1713 int last=0;
1714 for(i=0; i<64; i++){
1715 int j;
1716 v= get_bits(gb, 8);
1717 if(v==0) break;
1718
1719 last= v;
1720 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1721 s->inter_matrix[j]= v;
1722 s->chroma_inter_matrix[j]= v;
1723 }
1724
1725 /* replicate last value */
1726 for(; i<64; i++){
1727 int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1728 s->inter_matrix[j]= last;
1729 s->chroma_inter_matrix[j]= last;
1730 }
1731 }
1732
1733 // FIXME a bunch of grayscale shape things
1734 }
1735
1736 if(vo_ver_id != 1)
1737 s->quarter_sample= get_bits1(gb);
1738 else s->quarter_sample=0;
1739
1740 if(!get_bits1(gb)){
1741 int pos= get_bits_count(gb);
1742 int estimation_method= get_bits(gb, 2);
1743 if(estimation_method<2){
1744 if(!get_bits1(gb)){
1745 s->cplx_estimation_trash_i += 8*get_bits1(gb); //opaque
1746 s->cplx_estimation_trash_i += 8*get_bits1(gb); //transparent
1747 s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_cae
1748 s->cplx_estimation_trash_i += 8*get_bits1(gb); //inter_cae
1749 s->cplx_estimation_trash_i += 8*get_bits1(gb); //no_update
1750 s->cplx_estimation_trash_i += 8*get_bits1(gb); //upampling
1751 }
1752 if(!get_bits1(gb)){
1753 s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_blocks
1754 s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter_blocks
1755 s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter4v_blocks
1756 s->cplx_estimation_trash_i += 8*get_bits1(gb); //not coded blocks
1757 }
1758 if(!check_marker(gb, "in complexity estimation part 1")){
1759 skip_bits_long(gb, pos - get_bits_count(gb));
1760 goto no_cplx_est;
1761 }
1762 if(!get_bits1(gb)){
1763 s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_coeffs
1764 s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_lines
1765 s->cplx_estimation_trash_i += 8*get_bits1(gb); //vlc_syms
1766 s->cplx_estimation_trash_i += 4*get_bits1(gb); //vlc_bits
1767 }
1768 if(!get_bits1(gb)){
1769 s->cplx_estimation_trash_p += 8*get_bits1(gb); //apm
1770 s->cplx_estimation_trash_p += 8*get_bits1(gb); //npm
1771 s->cplx_estimation_trash_b += 8*get_bits1(gb); //interpolate_mc_q
1772 s->cplx_estimation_trash_p += 8*get_bits1(gb); //forwback_mc_q
1773 s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel2
1774 s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel4
1775 }
1776 if(!check_marker(gb, "in complexity estimation part 2")){
1777 skip_bits_long(gb, pos - get_bits_count(gb));
1778 goto no_cplx_est;
1779 }
1780 if(estimation_method==1){
1781 s->cplx_estimation_trash_i += 8*get_bits1(gb); //sadct
1782 s->cplx_estimation_trash_p += 8*get_bits1(gb); //qpel
1783 }
1784 }else
1785 av_log(s->avctx, AV_LOG_ERROR, "Invalid Complexity estimation method %d\n", estimation_method);
1786 }else{
1787 no_cplx_est:
1788 s->cplx_estimation_trash_i=
1789 s->cplx_estimation_trash_p=
1790 s->cplx_estimation_trash_b= 0;
1791 }
1792
1793 s->resync_marker= !get_bits1(gb); /* resync_marker_disabled */
1794
1795 s->data_partitioning= get_bits1(gb);
1796 if(s->data_partitioning){
1797 s->rvlc= get_bits1(gb);
1798 }
1799
1800 if(vo_ver_id != 1) {
1801 s->new_pred= get_bits1(gb);
1802 if(s->new_pred){
1803 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
1804 skip_bits(gb, 2); /* requested upstream message type */
1805 skip_bits1(gb); /* newpred segment type */
1806 }
1807 s->reduced_res_vop= get_bits1(gb);
1808 if(s->reduced_res_vop) av_log(s->avctx, AV_LOG_ERROR, "reduced resolution VOP not supported\n");
1809 }
1810 else{
1811 s->new_pred=0;
1812 s->reduced_res_vop= 0;
1813 }
1814
1815 s->scalability= get_bits1(gb);
1816
1817 if (s->scalability) {
1818 GetBitContext bak= *gb;
1819 int h_sampling_factor_n;
1820 int h_sampling_factor_m;
1821 int v_sampling_factor_n;
1822 int v_sampling_factor_m;
1823
1824 s->hierachy_type= get_bits1(gb);
1825 skip_bits(gb, 4); /* ref_layer_id */
1826 skip_bits1(gb); /* ref_layer_sampling_dir */
1827 h_sampling_factor_n= get_bits(gb, 5);
1828 h_sampling_factor_m= get_bits(gb, 5);
1829 v_sampling_factor_n= get_bits(gb, 5);
1830 v_sampling_factor_m= get_bits(gb, 5);
1831 s->enhancement_type= get_bits1(gb);
1832
1833 if( h_sampling_factor_n==0 || h_sampling_factor_m==0
1834 || v_sampling_factor_n==0 || v_sampling_factor_m==0){
1835 /* illegal scalability header (VERY broken encoder),
1836 * trying to workaround */
1837 s->scalability=0;
1838 *gb= bak;
1839 }else
1840 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
1841
1842 // bin shape stuff FIXME
1843 }
1844 }
1845 return 0;
1846 }
1847
1848 /**
1849 * decodes the user data stuff in the header.
1850 * Also initializes divx/xvid/lavc_version/build.
1851 */
1852 static int decode_user_data(MpegEncContext *s, GetBitContext *gb){
1853 char buf[256];
1854 int i;
1855 int e;
1856 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
1857 char last;
1858
1859 for(i=0; i<255 && get_bits_count(gb) < gb->size_in_bits; i++){
1860 if(show_bits(gb, 23) == 0) break;
1861 buf[i]= get_bits(gb, 8);
1862 }
1863 buf[i]=0;
1864
1865 /* divx detection */
1866 e=sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
1867 if(e<2)
1868 e=sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
1869 if(e>=2){
1870 s->divx_version= ver;
1871 s->divx_build= build;
1872 s->divx_packed= e==3 && last=='p';
1873 if(s->divx_packed && !s->showed_packed_warning) {
1874 av_log(s->avctx, AV_LOG_WARNING, "Invalid and inefficient vfw-avi packed B frames detected\n");
1875 s->showed_packed_warning=1;
1876 }
1877 }
1878
1879 /* ffmpeg detection */
1880 e=sscanf(buf, "FFmpe%*[^b]b%d", &build)+3;
1881 if(e!=4)
1882 e=sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
1883 if(e!=4){
1884 e=sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3)+1;
1885 if (e>1)
1886 build= (ver<<16) + (ver2<<8) + ver3;
1887 }
1888 if(e!=4){
1889 if(strcmp(buf, "ffmpeg")==0){
1890 s->lavc_build= 4600;
1891 }
1892 }
1893 if(e==4){
1894 s->lavc_build= build;
1895 }
1896
1897 /* Xvid detection */
1898 e=sscanf(buf, "XviD%d", &build);
1899 if(e==1){
1900 s->xvid_build= build;
1901 }
1902
1903 return 0;
1904 }
1905
1906 static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
1907 int time_incr, time_increment;
1908
1909 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
1910 if(s->pict_type==AV_PICTURE_TYPE_B && s->low_delay && s->vol_control_parameters==0 && !(s->flags & CODEC_FLAG_LOW_DELAY)){
1911 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n");
1912 s->low_delay=0;
1913 }
1914
1915 s->partitioned_frame= s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_B;
1916 if(s->partitioned_frame)
1917 s->decode_mb= mpeg4_decode_partitioned_mb;
1918 else
1919 s->decode_mb= mpeg4_decode_mb;
1920
1921 time_incr=0;
1922 while (get_bits1(gb) != 0)
1923 time_incr++;
1924
1925 check_marker(gb, "before time_increment");
1926
1927 if(s->time_increment_bits==0 || !(show_bits(gb, s->time_increment_bits+1)&1)){
1928 av_log(s->avctx, AV_LOG_ERROR, "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
1929
1930 for(s->time_increment_bits=1 ;s->time_increment_bits<16; s->time_increment_bits++){
1931 if ( s->pict_type == AV_PICTURE_TYPE_P
1932 || (s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE)) {
1933 if((show_bits(gb, s->time_increment_bits+6)&0x37) == 0x30) break;
1934 }else
1935 if((show_bits(gb, s->time_increment_bits+5)&0x1F) == 0x18) break;
1936 }
1937
1938 av_log(s->avctx, AV_LOG_ERROR, "my guess is %d bits ;)\n",s->time_increment_bits);
1939 }
1940
1941 if(IS_3IV1) time_increment= get_bits1(gb); //FIXME investigate further
1942 else time_increment= get_bits(gb, s->time_increment_bits);
1943
1944 if(s->pict_type!=AV_PICTURE_TYPE_B){
1945 s->last_time_base= s->time_base;
1946 s->time_base+= time_incr;
1947 s->time= s->time_base*s->avctx->time_base.den + time_increment;
1948 if(s->workaround_bugs&FF_BUG_UMP4){
1949 if(s->time < s->last_non_b_time){
1950 /* header is not mpeg-4-compatible, broken encoder,
1951 * trying to workaround */
1952 s->time_base++;
1953 s->time+= s->avctx->time_base.den;
1954 }
1955 }
1956 s->pp_time= s->time - s->last_non_b_time;
1957 s->last_non_b_time= s->time;
1958 }else{
1959 s->time= (s->last_time_base + time_incr)*s->avctx->time_base.den + time_increment;
1960 s->pb_time= s->pp_time - (s->last_non_b_time - s->time);
1961 if(s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0){
1962 /* messed up order, maybe after seeking? skipping current b-frame */
1963 return FRAME_SKIPPED;
1964 }
1965 ff_mpeg4_init_direct_mv(s);
1966
1967 if(s->t_frame==0) s->t_frame= s->pb_time;
1968 if(s->t_frame==0) s->t_frame=1; // 1/0 protection
1969 s->pp_field_time= ( ROUNDED_DIV(s->last_non_b_time, s->t_frame)
1970 - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
1971 s->pb_field_time= ( ROUNDED_DIV(s->time, s->t_frame)
1972 - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
1973 if(!s->progressive_sequence){
1974 if(s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1)
1975 return FRAME_SKIPPED;
1976 }
1977 }
1978
1979 if(s->avctx->time_base.num)
1980 s->current_picture_ptr->f.pts = (s->time + s->avctx->time_base.num / 2) / s->avctx->time_base.num;
1981 else
1982 s->current_picture_ptr->f.pts = AV_NOPTS_VALUE;
1983 if(s->avctx->debug&FF_DEBUG_PTS)
1984 av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n",
1985 s->current_picture_ptr->f.pts);
1986
1987 check_marker(gb, "before vop_coded");
1988
1989 /* vop coded */
1990 if (get_bits1(gb) != 1){
1991 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
1992 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
1993 return FRAME_SKIPPED;
1994 }
1995 if (s->shape != BIN_ONLY_SHAPE && ( s->pict_type == AV_PICTURE_TYPE_P
1996 || (s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE))) {
1997 /* rounding type for motion estimation */
1998 s->no_rounding = get_bits1(gb);
1999 } else {
2000 s->no_rounding = 0;
2001 }
2002 //FIXME reduced res stuff
2003
2004 if (s->shape != RECT_SHAPE) {
2005 if (s->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2006 skip_bits(gb, 13); /* width */
2007 skip_bits1(gb); /* marker */
2008 skip_bits(gb, 13); /* height */
2009 skip_bits1(gb); /* marker */
2010 skip_bits(gb, 13); /* hor_spat_ref */
2011 skip_bits1(gb); /* marker */
2012 skip_bits(gb, 13); /* ver_spat_ref */
2013 }
2014 skip_bits1(gb); /* change_CR_disable */
2015
2016 if (get_bits1(gb) != 0) {
2017 skip_bits(gb, 8); /* constant_alpha_value */
2018 }
2019 }
2020 //FIXME complexity estimation stuff
2021
2022 if (s->shape != BIN_ONLY_SHAPE) {
2023 skip_bits_long(gb, s->cplx_estimation_trash_i);
2024 if(s->pict_type != AV_PICTURE_TYPE_I)
2025 skip_bits_long(gb, s->cplx_estimation_trash_p);
2026 if(s->pict_type == AV_PICTURE_TYPE_B)
2027 skip_bits_long(gb, s->cplx_estimation_trash_b);
2028
2029 s->intra_dc_threshold= mpeg4_dc_threshold[ get_bits(gb, 3) ];
2030 if(!s->progressive_sequence){
2031 s->top_field_first= get_bits1(gb);
2032 s->alternate_scan= get_bits1(gb);
2033 }else
2034 s->alternate_scan= 0;
2035 }
2036
2037 if(s->alternate_scan){
2038 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
2039 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
2040 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2041 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2042 } else{
2043 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
2044 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
2045 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2046 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2047 }
2048
2049 if(s->pict_type == AV_PICTURE_TYPE_S && (s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE)){
2050 mpeg4_decode_sprite_trajectory(s, gb);
2051 if(s->sprite_brightness_change) av_log(s->avctx, AV_LOG_ERROR, "sprite_brightness_change not supported\n");
2052 if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2053 }
2054
2055 if (s->shape != BIN_ONLY_SHAPE) {
2056 s->chroma_qscale= s->qscale = get_bits(gb, s->quant_precision);
2057 if(s->qscale==0){
2058 av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (qscale=0)\n");
2059 return -1; // makes no sense to continue, as there is nothing left from the image then
2060 }
2061
2062 if (s->pict_type != AV_PICTURE_TYPE_I) {
2063 s->f_code = get_bits(gb, 3); /* fcode_for */
2064 if(s->f_code==0){
2065 av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (f_code=0)\n");
2066 return -1; // makes no sense to continue, as the MV decoding will break very quickly
2067 }
2068 }else
2069 s->f_code=1;
2070
2071 if (s->pict_type == AV_PICTURE_TYPE_B) {
2072 s->b_code = get_bits(gb, 3);
2073 }else
2074 s->b_code=1;
2075
2076 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2077 av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%d,%d %s size:%d pro:%d alt:%d top:%d %spel part:%d resync:%d w:%d a:%d rnd:%d vot:%d%s dc:%d ce:%d/%d/%d\n",
2078 s->qscale, s->f_code, s->b_code,
2079 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")),
2080 gb->size_in_bits,s->progressive_sequence, s->alternate_scan, s->top_field_first,
2081 s->quarter_sample ? "q" : "h", s->data_partitioning, s->resync_marker, s->num_sprite_warping_points,
2082 s->sprite_warping_accuracy, 1-s->no_rounding, s->vo_type, s->vol_control_parameters ? " VOLC" : " ", s->intra_dc_threshold, s->cplx_estimation_trash_i, s->cplx_estimation_trash_p, s->cplx_estimation_trash_b);
2083 }
2084
2085 if(!s->scalability){
2086 if (s->shape!=RECT_SHAPE && s->pict_type!=AV_PICTURE_TYPE_I) {
2087 skip_bits1(gb); // vop shape coding type
2088 }
2089 }else{
2090 if(s->enhancement_type){
2091 int load_backward_shape= get_bits1(gb);
2092 if(load_backward_shape){
2093 av_log(s->avctx, AV_LOG_ERROR, "load backward shape isn't supported\n");
2094 }
2095 }
2096 skip_bits(gb, 2); //ref_select_code
2097 }
2098 }
2099 /* detect buggy encoders which don't set the low_delay flag (divx4/xvid/opendivx)*/
2100 // note we cannot detect divx5 without b-frames easily (although it's buggy too)
2101 if(s->vo_type==0 && s->vol_control_parameters==0 && s->divx_version==-1 && s->picture_number==0){
2102 av_log(s->avctx, AV_LOG_WARNING, "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2103 s->low_delay=1;
2104 }
2105
2106 s->picture_number++; // better than pic number==0 always ;)
2107
2108 s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table; //FIXME add short header support
2109 s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
2110
2111 if(s->workaround_bugs&FF_BUG_EDGE){
2112 s->h_edge_pos= s->width;
2113 s->v_edge_pos= s->height;
2114 }
2115 return 0;
2116 }
2117
2118 /**
2119 * decode mpeg4 headers
2120 * @return <0 if no VOP found (or a damaged one)
2121 * FRAME_SKIPPED if a not coded VOP is found
2122 * 0 if a VOP is found
2123 */
2124 int ff_mpeg4_decode_picture_header(MpegEncContext * s, GetBitContext *gb)
2125 {
2126 int startcode, v;
2127
2128 /* search next start code */
2129 align_get_bits(gb);
2130
2131 if(s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630){
2132 skip_bits(gb, 24);
2133 if(get_bits(gb, 8) == 0xF0)
2134 goto end;
2135 }
2136
2137 startcode = 0xff;
2138 for(;;) {
2139 if(get_bits_count(gb) >= gb->size_in_bits){
2140 if(gb->size_in_bits==8 && (s->divx_version>=0 || s->xvid_build>=0)){
2141 av_log(s->avctx, AV_LOG_WARNING, "frame skip %d\n", gb->size_in_bits);
2142 return FRAME_SKIPPED; //divx bug
2143 }else
2144 return -1; //end of stream
2145 }
2146
2147 /* use the bits after the test */
2148 v = get_bits(gb, 8);
2149 startcode = ((startcode << 8) | v) & 0xffffffff;
2150
2151 if((startcode&0xFFFFFF00) != 0x100)
2152 continue; //no startcode
2153
2154 if(s->avctx->debug&FF_DEBUG_STARTCODE){
2155 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2156 if (startcode<=0x11F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2157 else if(startcode<=0x12F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2158 else if(startcode<=0x13F) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2159 else if(startcode<=0x15F) av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2160 else if(startcode<=0x1AF) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2161 else if(startcode==0x1B0) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2162 else if(startcode==0x1B1) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2163 else if(startcode==0x1B2) av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2164 else if(startcode==0x1B3) av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2165 else if(startcode==0x1B4) av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2166 else if(startcode==0x1B5) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2167 else if(startcode==0x1B6) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2168 else if(startcode==0x1B7) av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2169 else if(startcode==0x1B8) av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2170 else if(startcode==0x1B9) av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2171 else if(startcode==0x1BA) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2172 else if(startcode==0x1BB) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2173 else if(startcode==0x1BC) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2174 else if(startcode==0x1BD) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2175 else if(startcode==0x1BE) av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2176 else if(startcode==0x1BF) av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2177 else if(startcode==0x1C0) av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2178 else if(startcode==0x1C1) av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2179 else if(startcode==0x1C2) av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2180 else if(startcode==0x1C3) av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2181 else if(startcode<=0x1C5) av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2182 else if(startcode<=0x1FF) av_log(s->avctx, AV_LOG_DEBUG, "System start");
2183 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2184 }
2185
2186 if(startcode >= 0x120 && startcode <= 0x12F){
2187 if(decode_vol_header(s, gb) < 0)
2188 return -1;
2189 }
2190 else if(startcode == USER_DATA_STARTCODE){
2191 decode_user_data(s, gb);
2192 }
2193 else if(startcode == GOP_STARTCODE){
2194 mpeg4_decode_gop_header(s, gb);
2195 }
2196 else if(startcode == VOS_STARTCODE){
2197 mpeg4_decode_profile_level(s, gb);
2198 }
2199 else if(startcode == VOP_STARTCODE){
2200 break;
2201 }
2202
2203 align_get_bits(gb);
2204 startcode = 0xff;
2205 }
2206 end:
2207 if(s->flags& CODEC_FLAG_LOW_DELAY)
2208 s->low_delay=1;
2209 s->avctx->has_b_frames= !s->low_delay;
2210 return decode_vop_header(s, gb);
2211 }
2212
2213 static av_cold int decode_init(AVCodecContext *avctx)
2214 {
2215 MpegEncContext *s = avctx->priv_data;
2216 int ret;
2217 static int done = 0;
2218
2219 s->divx_version=
2220 s->divx_build=
2221 s->xvid_build=
2222 s->lavc_build= -1;
2223
2224 if((ret=ff_h263_decode_init(avctx)) < 0)
2225 return ret;
2226
2227 if (!done) {
2228 done = 1;
2229
2230 init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
2231 init_rl(&rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
2232 init_rl(&rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
2233 INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
2234 INIT_VLC_RL(rvlc_rl_inter, 1072);
2235 INIT_VLC_RL(rvlc_rl_intra, 1072);
2236 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2237 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2238 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2239 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2240 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2241 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2242 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2243 &sprite_trajectory_tab[0][1], 4, 2,
2244 &sprite_trajectory_tab[0][0], 4, 2, 128);
2245 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2246 &mb_type_b_tab[0][1], 2, 1,
2247 &mb_type_b_tab[0][0], 2, 1, 16);
2248 }
2249
2250 s->h263_pred = 1;
2251 s->low_delay = 0; //default, might be overriden in the vol header during header parsing
2252 s->decode_mb= mpeg4_decode_mb;
2253 s->time_increment_bits = 4; /* default value for broken headers */
2254 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
2255
2256 return 0;
2257 }
2258
2259 static const AVProfile mpeg4_video_profiles[] = {
2260 { FF_PROFILE_MPEG4_SIMPLE, "Simple Profile" },
2261 { FF_PROFILE_MPEG4_SIMPLE_SCALABLE, "Simple Scalable Profile" },
2262 { FF_PROFILE_MPEG4_CORE, "Core Profile" },
2263 { FF_PROFILE_MPEG4_MAIN, "Main Profile" },
2264 { FF_PROFILE_MPEG4_N_BIT, "N-bit Profile" },
2265 { FF_PROFILE_MPEG4_SCALABLE_TEXTURE, "Scalable Texture Profile" },
2266 { FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION, "Simple Face Animation Profile" },
2267 { FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE, "Basic Animated Texture Profile" },
2268 { FF_PROFILE_MPEG4_HYBRID, "Hybrid Profile" },
2269 { FF_PROFILE_MPEG4_ADVANCED_REAL_TIME, "Advanced Real Time Simple Profile" },
2270 { FF_PROFILE_MPEG4_CORE_SCALABLE, "Code Scalable Profile" },
2271 { FF_PROFILE_MPEG4_ADVANCED_CODING, "Advanced Coding Profile" },
2272 { FF_PROFILE_MPEG4_ADVANCED_CORE, "Advanced Core Profile" },
2273 { FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" },
2274 { FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" },
2275 { FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" },
2276 };
2277
2278 AVCodec ff_mpeg4_decoder = {
2279 "mpeg4",
2280 AVMEDIA_TYPE_VIDEO,
2281 CODEC_ID_MPEG4,
2282 sizeof(MpegEncContext),
2283 decode_init,
2284 NULL,
2285 ff_h263_decode_end,
2286 ff_h263_decode_frame,
2287 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_FRAME_THREADS,
2288 .flush= ff_mpeg_flush,
2289 .max_lowres= 3,
2290 .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2291 .pix_fmts= ff_hwaccel_pixfmt_list_420,
2292 .profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
2293 .update_thread_context= ONLY_IF_THREADS_ENABLED(ff_mpeg_update_thread_context)
2294 };
2295
2296
2297 #if CONFIG_MPEG4_VDPAU_DECODER
2298 AVCodec ff_mpeg4_vdpau_decoder = {
2299 "mpeg4_vdpau",
2300 AVMEDIA_TYPE_VIDEO,
2301 CODEC_ID_MPEG4,
2302 sizeof(MpegEncContext),
2303 decode_init,
2304 NULL,
2305 ff_h263_decode_end,
2306 ff_h263_decode_frame,
2307 CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_HWACCEL_VDPAU,
2308 .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2309 .pix_fmts= (const enum PixelFormat[]){PIX_FMT_VDPAU_MPEG4, PIX_FMT_NONE},
2310 };
2311 #endif
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