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