3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of Libav.
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.
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.
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
23 #include "error_resilience.h"
25 #include "mpegvideo.h"
26 #include "mpeg4video.h"
30 // The defines below define the number of bits that are read at once for
31 // reading vlc values. Changing these may improve speed and data cache needs
32 // be aware though that decreasing them may need the number of stages that is
33 // passed to get_vlc* to be increased.
34 #define SPRITE_TRAJ_VLC_BITS 6
36 #define MB_TYPE_B_VLC_BITS 4
39 static VLC dc_lum, dc_chrom;
40 static VLC sprite_trajectory;
41 static VLC mb_type_b_vlc;
43 static const int mb_type_b_map[4]= {
44 MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
45 MB_TYPE_L0L1 | MB_TYPE_16x16,
46 MB_TYPE_L1 | MB_TYPE_16x16,
47 MB_TYPE_L0 | MB_TYPE_16x16,
52 * @param n block index (0-3 are luma, 4-5 are chroma)
53 * @param dir the ac prediction direction
55 void ff_mpeg4_pred_ac(MpegEncContext * s, int16_t *block, int n,
59 int16_t *ac_val, *ac_val1;
60 int8_t * const qscale_table = s->current_picture.qscale_table;
63 ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
67 const int xy= s->mb_x-1 + s->mb_y*s->mb_stride;
71 if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){
74 block[s->dsp.idct_permutation[i<<3]] += ac_val[i];
77 /* different qscale, we must rescale */
79 block[s->dsp.idct_permutation[i<<3]] += ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale);
83 const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride;
85 ac_val -= 16 * s->block_wrap[n];
87 if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
90 block[s->dsp.idct_permutation[i]] += ac_val[i + 8];
93 /* different qscale, we must rescale */
95 block[s->dsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale);
102 ac_val1[i ] = block[s->dsp.idct_permutation[i<<3]];
106 ac_val1[8 + i] = block[s->dsp.idct_permutation[i ]];
111 * check if the next stuff is a resync marker or the end.
114 static inline int mpeg4_is_resync(MpegEncContext *s){
115 int bits_count= get_bits_count(&s->gb);
116 int v= show_bits(&s->gb, 16);
118 if(s->workaround_bugs&FF_BUG_NO_PADDING){
123 if(s->pict_type==AV_PICTURE_TYPE_B || (v>>(8-s->pict_type)!=1) || s->partitioned_frame)
125 skip_bits(&s->gb, 8+s->pict_type);
126 bits_count+= 8+s->pict_type;
127 v= show_bits(&s->gb, 16);
130 if(bits_count + 8 >= s->gb.size_in_bits){
132 v|= 0x7F >> (7-(bits_count&7));
137 if(v == ff_mpeg4_resync_prefix[bits_count&7]){
139 GetBitContext gb= s->gb;
141 skip_bits(&s->gb, 1);
142 align_get_bits(&s->gb);
144 for(len=0; len<32; len++){
145 if(get_bits1(&s->gb)) break;
150 if(len>=ff_mpeg4_get_video_packet_prefix_length(s))
157 static void mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb)
160 int a= 2<<s->sprite_warping_accuracy;
161 int rho= 3-s->sprite_warping_accuracy;
163 const int vop_ref[4][2]= {{0,0}, {s->width,0}, {0, s->height}, {s->width, s->height}}; // only true for rectangle shapes
164 int d[4][2]={{0,0}, {0,0}, {0,0}, {0,0}};
165 int sprite_ref[4][2];
166 int virtual_ref[2][2];
173 for(i=0; i<s->num_sprite_warping_points; i++){
177 length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
179 x= get_xbits(gb, length);
181 if(!(s->divx_version==500 && s->divx_build==413)) skip_bits1(gb); /* marker bit */
183 length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
185 y=get_xbits(gb, length);
187 skip_bits1(gb); /* marker bit */
188 s->sprite_traj[i][0]= d[i][0]= x;
189 s->sprite_traj[i][1]= d[i][1]= y;
192 s->sprite_traj[i][0]= s->sprite_traj[i][1]= 0;
194 while((1<<alpha)<w) alpha++;
195 while((1<<beta )<h) beta++; // there seems to be a typo in the mpeg4 std for the definition of w' and h'
199 // Note, the 4th point isn't used for GMC
200 if(s->divx_version==500 && s->divx_build==413){
201 sprite_ref[0][0]= a*vop_ref[0][0] + d[0][0];
202 sprite_ref[0][1]= a*vop_ref[0][1] + d[0][1];
203 sprite_ref[1][0]= a*vop_ref[1][0] + d[0][0] + d[1][0];
204 sprite_ref[1][1]= a*vop_ref[1][1] + d[0][1] + d[1][1];
205 sprite_ref[2][0]= a*vop_ref[2][0] + d[0][0] + d[2][0];
206 sprite_ref[2][1]= a*vop_ref[2][1] + d[0][1] + d[2][1];
208 sprite_ref[0][0]= (a>>1)*(2*vop_ref[0][0] + d[0][0]);
209 sprite_ref[0][1]= (a>>1)*(2*vop_ref[0][1] + d[0][1]);
210 sprite_ref[1][0]= (a>>1)*(2*vop_ref[1][0] + d[0][0] + d[1][0]);
211 sprite_ref[1][1]= (a>>1)*(2*vop_ref[1][1] + d[0][1] + d[1][1]);
212 sprite_ref[2][0]= (a>>1)*(2*vop_ref[2][0] + d[0][0] + d[2][0]);
213 sprite_ref[2][1]= (a>>1)*(2*vop_ref[2][1] + d[0][1] + d[2][1]);
215 /* sprite_ref[3][0]= (a>>1)*(2*vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
216 sprite_ref[3][1]= (a>>1)*(2*vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
218 // this is mostly identical to the mpeg4 std (and is totally unreadable because of that ...)
219 // perhaps it should be reordered to be more readable ...
220 // the idea behind this virtual_ref mess is to be able to use shifts later per pixel instead of divides
221 // so the distance between points is converted from w&h based to w2&h2 based which are of the 2^x form
222 virtual_ref[0][0]= 16*(vop_ref[0][0] + w2)
223 + 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);
224 virtual_ref[0][1]= 16*vop_ref[0][1]
225 + 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);
226 virtual_ref[1][0]= 16*vop_ref[0][0]
227 + 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);
228 virtual_ref[1][1]= 16*(vop_ref[0][1] + h2)
229 + 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);
231 switch(s->num_sprite_warping_points)
234 s->sprite_offset[0][0]= 0;
235 s->sprite_offset[0][1]= 0;
236 s->sprite_offset[1][0]= 0;
237 s->sprite_offset[1][1]= 0;
238 s->sprite_delta[0][0]= a;
239 s->sprite_delta[0][1]= 0;
240 s->sprite_delta[1][0]= 0;
241 s->sprite_delta[1][1]= a;
242 s->sprite_shift[0]= 0;
243 s->sprite_shift[1]= 0;
246 s->sprite_offset[0][0]= sprite_ref[0][0] - a*vop_ref[0][0];
247 s->sprite_offset[0][1]= sprite_ref[0][1] - a*vop_ref[0][1];
248 s->sprite_offset[1][0]= ((sprite_ref[0][0]>>1)|(sprite_ref[0][0]&1)) - a*(vop_ref[0][0]/2);
249 s->sprite_offset[1][1]= ((sprite_ref[0][1]>>1)|(sprite_ref[0][1]&1)) - a*(vop_ref[0][1]/2);
250 s->sprite_delta[0][0]= a;
251 s->sprite_delta[0][1]= 0;
252 s->sprite_delta[1][0]= 0;
253 s->sprite_delta[1][1]= a;
254 s->sprite_shift[0]= 0;
255 s->sprite_shift[1]= 0;
258 s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+rho))
259 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][0])
260 + ( r*sprite_ref[0][1] - virtual_ref[0][1])*(-vop_ref[0][1])
261 + (1<<(alpha+rho-1));
262 s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+rho))
263 + (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-vop_ref[0][0])
264 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][1])
265 + (1<<(alpha+rho-1));
266 s->sprite_offset[1][0]= ( (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][0] + 1)
267 +( r*sprite_ref[0][1] - virtual_ref[0][1])*(-2*vop_ref[0][1] + 1)
268 +2*w2*r*sprite_ref[0][0]
270 + (1<<(alpha+rho+1)));
271 s->sprite_offset[1][1]= ( (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-2*vop_ref[0][0] + 1)
272 +(-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][1] + 1)
273 +2*w2*r*sprite_ref[0][1]
275 + (1<<(alpha+rho+1)));
276 s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
277 s->sprite_delta[0][1]= (+r*sprite_ref[0][1] - virtual_ref[0][1]);
278 s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1]);
279 s->sprite_delta[1][1]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
281 s->sprite_shift[0]= alpha+rho;
282 s->sprite_shift[1]= alpha+rho+2;
285 min_ab= FFMIN(alpha, beta);
288 s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+beta+rho-min_ab))
289 + (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-vop_ref[0][0])
290 + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-vop_ref[0][1])
291 + (1<<(alpha+beta+rho-min_ab-1));
292 s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+beta+rho-min_ab))
293 + (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-vop_ref[0][0])
294 + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-vop_ref[0][1])
295 + (1<<(alpha+beta+rho-min_ab-1));
296 s->sprite_offset[1][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-2*vop_ref[0][0] + 1)
297 + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-2*vop_ref[0][1] + 1)
298 + 2*w2*h3*r*sprite_ref[0][0]
300 + (1<<(alpha+beta+rho-min_ab+1));
301 s->sprite_offset[1][1]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-2*vop_ref[0][0] + 1)
302 + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-2*vop_ref[0][1] + 1)
303 + 2*w2*h3*r*sprite_ref[0][1]
305 + (1<<(alpha+beta+rho-min_ab+1));
306 s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3;
307 s->sprite_delta[0][1]= (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3;
308 s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3;
309 s->sprite_delta[1][1]= (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3;
311 s->sprite_shift[0]= alpha + beta + rho - min_ab;
312 s->sprite_shift[1]= alpha + beta + rho - min_ab + 2;
315 /* try to simplify the situation */
316 if( s->sprite_delta[0][0] == a<<s->sprite_shift[0]
317 && s->sprite_delta[0][1] == 0
318 && s->sprite_delta[1][0] == 0
319 && s->sprite_delta[1][1] == a<<s->sprite_shift[0])
321 s->sprite_offset[0][0]>>=s->sprite_shift[0];
322 s->sprite_offset[0][1]>>=s->sprite_shift[0];
323 s->sprite_offset[1][0]>>=s->sprite_shift[1];
324 s->sprite_offset[1][1]>>=s->sprite_shift[1];
325 s->sprite_delta[0][0]= a;
326 s->sprite_delta[0][1]= 0;
327 s->sprite_delta[1][0]= 0;
328 s->sprite_delta[1][1]= a;
329 s->sprite_shift[0]= 0;
330 s->sprite_shift[1]= 0;
331 s->real_sprite_warping_points=1;
334 int shift_y= 16 - s->sprite_shift[0];
335 int shift_c= 16 - s->sprite_shift[1];
337 s->sprite_offset[0][i]<<= shift_y;
338 s->sprite_offset[1][i]<<= shift_c;
339 s->sprite_delta[0][i]<<= shift_y;
340 s->sprite_delta[1][i]<<= shift_y;
341 s->sprite_shift[i]= 16;
343 s->real_sprite_warping_points= s->num_sprite_warping_points;
348 * Decode the next video packet.
349 * @return <0 if something went wrong
351 int ff_mpeg4_decode_video_packet_header(MpegEncContext *s)
353 int mb_num_bits= av_log2(s->mb_num - 1) + 1;
354 int header_extension=0, mb_num, len;
356 /* is there enough space left for a video packet + header */
357 if( get_bits_count(&s->gb) > s->gb.size_in_bits-20) return -1;
359 for(len=0; len<32; len++){
360 if(get_bits1(&s->gb)) break;
363 if(len!=ff_mpeg4_get_video_packet_prefix_length(s)){
364 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
368 if(s->shape != RECT_SHAPE){
369 header_extension= get_bits1(&s->gb);
370 //FIXME more stuff here
373 mb_num= get_bits(&s->gb, mb_num_bits);
374 if(mb_num>=s->mb_num){
375 av_log(s->avctx, AV_LOG_ERROR, "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
378 if(s->pict_type == AV_PICTURE_TYPE_B){
379 int mb_x = 0, mb_y = 0;
381 while (s->next_picture.mbskip_table[s->mb_index2xy[mb_num]]) {
383 ff_thread_await_progress(&s->next_picture_ptr->tf, mb_y++, 0);
385 if (++mb_x == s->mb_width) mb_x = 0;
387 if(mb_num >= s->mb_num) return -1; // slice contains just skipped MBs which where already decoded
390 s->mb_x= mb_num % s->mb_width;
391 s->mb_y= mb_num / s->mb_width;
393 if(s->shape != BIN_ONLY_SHAPE){
394 int qscale= get_bits(&s->gb, s->quant_precision);
396 s->chroma_qscale=s->qscale= qscale;
399 if(s->shape == RECT_SHAPE){
400 header_extension= get_bits1(&s->gb);
402 if(header_extension){
405 while (get_bits1(&s->gb) != 0)
408 check_marker(&s->gb, "before time_increment in video packed header");
409 skip_bits(&s->gb, s->time_increment_bits); /* time_increment */
410 check_marker(&s->gb, "before vop_coding_type in video packed header");
412 skip_bits(&s->gb, 2); /* vop coding type */
413 //FIXME not rect stuff here
415 if(s->shape != BIN_ONLY_SHAPE){
416 skip_bits(&s->gb, 3); /* intra dc vlc threshold */
417 //FIXME don't just ignore everything
418 if(s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
419 mpeg4_decode_sprite_trajectory(s, &s->gb);
420 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
423 //FIXME reduced res stuff here
425 if (s->pict_type != AV_PICTURE_TYPE_I) {
426 int f_code = get_bits(&s->gb, 3); /* fcode_for */
428 av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (f_code=0)\n");
431 if (s->pict_type == AV_PICTURE_TYPE_B) {
432 int b_code = get_bits(&s->gb, 3);
434 av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (b_code=0)\n");
439 //FIXME new-pred stuff
445 * Get the average motion vector for a GMC MB.
446 * @param n either 0 for the x component or 1 for y
447 * @return the average MV for a GMC MB
449 static inline int get_amv(MpegEncContext *s, int n){
450 int x, y, mb_v, sum, dx, dy, shift;
451 int len = 1 << (s->f_code + 4);
452 const int a= s->sprite_warping_accuracy;
454 if(s->workaround_bugs & FF_BUG_AMV)
455 len >>= s->quarter_sample;
457 if(s->real_sprite_warping_points==1){
458 if(s->divx_version==500 && s->divx_build==413)
459 sum= s->sprite_offset[0][n] / (1<<(a - s->quarter_sample));
461 sum= RSHIFT(s->sprite_offset[0][n]<<s->quarter_sample, a);
463 dx= s->sprite_delta[n][0];
464 dy= s->sprite_delta[n][1];
465 shift= s->sprite_shift[0];
466 if(n) dy -= 1<<(shift + a + 1);
467 else dx -= 1<<(shift + a + 1);
468 mb_v= s->sprite_offset[0][n] + dx*s->mb_x*16 + dy*s->mb_y*16;
481 sum= RSHIFT(sum, a+8-s->quarter_sample);
484 if (sum < -len) sum= -len;
485 else if (sum >= len) sum= len-1;
491 * Decode the dc value.
492 * @param n block index (0-3 are luma, 4-5 are chroma)
493 * @param dir_ptr the prediction direction will be stored here
494 * @return the quantized dc
496 static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
501 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
503 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
504 if (code < 0 || code > 9 /* && s->nbit<9 */){
505 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
513 level= 2*get_bits1(&s->gb)-1;
515 if(get_bits1(&s->gb))
516 level = get_bits(&s->gb, code-1) + (1<<(code-1));
518 level = -get_bits(&s->gb, code-1) - (1<<(code-1));
521 level = get_xbits(&s->gb, code);
525 if(get_bits1(&s->gb)==0){ /* marker */
526 if(s->err_recognition&AV_EF_BITSTREAM){
527 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
534 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
538 * Decode first partition.
539 * @return number of MBs decoded or <0 if an error occurred
541 static int mpeg4_decode_partition_a(MpegEncContext *s){
543 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
545 /* decode first partition */
547 s->first_slice_line=1;
548 for(; s->mb_y<s->mb_height; s->mb_y++){
549 ff_init_block_index(s);
550 for(; s->mb_x<s->mb_width; s->mb_x++){
551 const int xy= s->mb_x + s->mb_y*s->mb_stride;
556 ff_update_block_index(s);
557 if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
558 s->first_slice_line=0;
560 if(s->pict_type==AV_PICTURE_TYPE_I){
564 if(show_bits_long(&s->gb, 19)==DC_MARKER){
568 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
570 av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
575 s->cbp_table[xy]= cbpc & 3;
576 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
580 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
582 s->current_picture.qscale_table[xy]= s->qscale;
584 s->mbintra_table[xy]= 1;
587 int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
589 av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
593 if(dc_pred_dir) dir|=1;
595 s->pred_dir_table[xy]= dir;
596 }else{ /* P/S_TYPE */
597 int mx, my, pred_x, pred_y, bits;
598 int16_t * const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
599 const int stride= s->b8_stride*2;
602 bits= show_bits(&s->gb, 17);
603 if(bits==MOTION_MARKER){
609 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
610 s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
614 s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
617 mot_val[0 ]= mot_val[2 ]=
618 mot_val[0+stride]= mot_val[2+stride]= mx;
619 mot_val[1 ]= mot_val[3 ]=
620 mot_val[1+stride]= mot_val[3+stride]= my;
622 if(s->mbintra_table[xy])
623 ff_clean_intra_table_entries(s);
627 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
629 av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
635 s->cbp_table[xy]= cbpc&(8+3); //8 is dquant
637 s->mb_intra = ((cbpc & 4) != 0);
640 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
641 s->mbintra_table[xy]= 1;
642 mot_val[0 ]= mot_val[2 ]=
643 mot_val[0+stride]= mot_val[2+stride]= 0;
644 mot_val[1 ]= mot_val[3 ]=
645 mot_val[1+stride]= mot_val[3+stride]= 0;
647 if(s->mbintra_table[xy])
648 ff_clean_intra_table_entries(s);
650 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
651 s->mcsel= get_bits1(&s->gb);
654 if ((cbpc & 16) == 0) {
655 /* 16x16 motion prediction */
657 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
659 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
663 my = ff_h263_decode_motion(s, pred_y, s->f_code);
666 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
670 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
673 mot_val[0 ]= mot_val[2 ] =
674 mot_val[0+stride]= mot_val[2+stride]= mx;
675 mot_val[1 ]= mot_val[3 ]=
676 mot_val[1+stride]= mot_val[3+stride]= my;
679 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
681 int16_t *mot_val= ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
682 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
686 my = ff_h263_decode_motion(s, pred_y, s->f_code);
703 * decode second partition.
704 * @return <0 if an error occurred
706 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count){
708 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
710 s->mb_x= s->resync_mb_x;
711 s->first_slice_line=1;
712 for(s->mb_y= s->resync_mb_y; mb_num < mb_count; s->mb_y++){
713 ff_init_block_index(s);
714 for(; mb_num < mb_count && s->mb_x<s->mb_width; s->mb_x++){
715 const int xy= s->mb_x + s->mb_y*s->mb_stride;
718 ff_update_block_index(s);
719 if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
720 s->first_slice_line=0;
722 if(s->pict_type==AV_PICTURE_TYPE_I){
723 int ac_pred= get_bits1(&s->gb);
724 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
726 av_log(s->avctx, AV_LOG_ERROR, "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
730 s->cbp_table[xy]|= cbpy<<2;
731 s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
732 }else{ /* P || S_TYPE */
733 if (IS_INTRA(s->current_picture.mb_type[xy])) {
735 int ac_pred = get_bits1(&s->gb);
736 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
739 av_log(s->avctx, AV_LOG_ERROR, "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
743 if(s->cbp_table[xy] & 8) {
744 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
746 s->current_picture.qscale_table[xy] = s->qscale;
750 int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
752 av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
756 if(dc_pred_dir) dir|=1;
758 s->cbp_table[xy]&= 3; //remove dquant
759 s->cbp_table[xy]|= cbpy<<2;
760 s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
761 s->pred_dir_table[xy]= dir;
762 } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
763 s->current_picture.qscale_table[xy] = s->qscale;
766 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
769 av_log(s->avctx, AV_LOG_ERROR, "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
773 if(s->cbp_table[xy] & 8) {
774 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
776 s->current_picture.qscale_table[xy] = s->qscale;
778 s->cbp_table[xy]&= 3; //remove dquant
779 s->cbp_table[xy]|= (cbpy^0xf)<<2;
783 if(mb_num >= mb_count) return 0;
790 * Decode the first and second partition.
791 * @return <0 if error (and sets error type in the error_status_table)
793 int ff_mpeg4_decode_partitions(MpegEncContext *s)
796 const int part_a_error= s->pict_type==AV_PICTURE_TYPE_I ? (ER_DC_ERROR|ER_MV_ERROR) : ER_MV_ERROR;
797 const int part_a_end = s->pict_type==AV_PICTURE_TYPE_I ? (ER_DC_END |ER_MV_END) : ER_MV_END;
799 mb_num= mpeg4_decode_partition_a(s);
801 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
805 if(s->resync_mb_x + s->resync_mb_y*s->mb_width + mb_num > s->mb_num){
806 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
807 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
811 s->mb_num_left= mb_num;
813 if(s->pict_type==AV_PICTURE_TYPE_I){
814 while(show_bits(&s->gb, 9) == 1)
815 skip_bits(&s->gb, 9);
816 if(get_bits_long(&s->gb, 19)!=DC_MARKER){
817 av_log(s->avctx, AV_LOG_ERROR, "marker missing after first I partition at %d %d\n", s->mb_x, s->mb_y);
821 while(show_bits(&s->gb, 10) == 1)
822 skip_bits(&s->gb, 10);
823 if(get_bits(&s->gb, 17)!=MOTION_MARKER){
824 av_log(s->avctx, AV_LOG_ERROR, "marker missing after first P partition at %d %d\n", s->mb_x, s->mb_y);
828 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, part_a_end);
830 if( mpeg4_decode_partition_b(s, mb_num) < 0){
831 if(s->pict_type==AV_PICTURE_TYPE_P)
832 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_DC_ERROR);
835 if(s->pict_type==AV_PICTURE_TYPE_P)
836 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_DC_END);
844 * @return <0 if an error occurred
846 static inline int mpeg4_decode_block(MpegEncContext * s, int16_t * block,
847 int n, int coded, int intra, int rvlc)
849 int level, i, last, run;
852 RL_VLC_ELEM * rl_vlc;
853 const uint8_t * scan_table;
856 //Note intra & rvlc should be optimized away if this is inlined
859 if(s->use_intra_dc_vlc){
861 if(s->partitioned_frame){
862 level = s->dc_val[0][ s->block_index[n] ];
863 if(n<4) level= FASTDIV((level + (s->y_dc_scale>>1)), s->y_dc_scale);
864 else level= FASTDIV((level + (s->c_dc_scale>>1)), s->c_dc_scale);
865 dc_pred_dir= (s->pred_dir_table[s->mb_x + s->mb_y*s->mb_stride]<<n)&32;
867 level = mpeg4_decode_dc(s, n, &dc_pred_dir);
875 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
881 rl = &ff_rvlc_rl_intra;
882 rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
884 rl = &ff_mpeg4_rl_intra;
885 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
888 if (dc_pred_dir == 0)
889 scan_table = s->intra_v_scantable.permutated; /* left */
891 scan_table = s->intra_h_scantable.permutated; /* top */
893 scan_table = s->intra_scantable.permutated;
900 s->block_last_index[n] = i;
903 if(rvlc) rl = &ff_rvlc_rl_inter;
904 else rl = &ff_h263_rl_inter;
906 scan_table = s->intra_scantable.permutated;
912 rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
914 rl_vlc = ff_h263_rl_inter.rl_vlc[0];
917 qmul = s->qscale << 1;
918 qadd = (s->qscale - 1) | 1;
920 rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
922 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
927 OPEN_READER(re, &s->gb);
929 UPDATE_CACHE(re, &s->gb);
930 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
934 if(SHOW_UBITS(re, &s->gb, 1)==0){
935 av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in rvlc esc\n");
937 }; SKIP_CACHE(re, &s->gb, 1);
939 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
940 run= SHOW_UBITS(re, &s->gb, 6);
941 SKIP_COUNTER(re, &s->gb, 1+1+6);
942 UPDATE_CACHE(re, &s->gb);
944 if(SHOW_UBITS(re, &s->gb, 1)==0){
945 av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in rvlc esc\n");
947 }; SKIP_CACHE(re, &s->gb, 1);
949 level= SHOW_UBITS(re, &s->gb, 11); SKIP_CACHE(re, &s->gb, 11);
951 if(SHOW_UBITS(re, &s->gb, 5)!=0x10){
952 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
954 }; SKIP_CACHE(re, &s->gb, 5);
956 level= level * qmul + qadd;
957 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
958 SKIP_COUNTER(re, &s->gb, 1+11+5+1);
964 cache= GET_CACHE(re, &s->gb);
969 if (cache&0x80000000) {
970 if (cache&0x40000000) {
972 SKIP_CACHE(re, &s->gb, 2);
973 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
974 run= SHOW_UBITS(re, &s->gb, 6);
975 SKIP_COUNTER(re, &s->gb, 2+1+6);
976 UPDATE_CACHE(re, &s->gb);
979 level= SHOW_SBITS(re, &s->gb, 12); LAST_SKIP_BITS(re, &s->gb, 12);
981 if(SHOW_UBITS(re, &s->gb, 1)==0){
982 av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in 3. esc\n");
984 }; SKIP_CACHE(re, &s->gb, 1);
986 level= SHOW_SBITS(re, &s->gb, 12); SKIP_CACHE(re, &s->gb, 12);
988 if(SHOW_UBITS(re, &s->gb, 1)==0){
989 av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in 3. esc\n");
993 SKIP_COUNTER(re, &s->gb, 1+12+1);
996 if (level>0) level= level * qmul + qadd;
997 else level= level * qmul - qadd;
999 if((unsigned)(level + 2048) > 4095){
1000 if(s->err_recognition & AV_EF_BITSTREAM){
1001 if(level > 2560 || level<-2560){
1002 av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc, qp=%d\n", s->qscale);
1006 level= level<0 ? -2048 : 2047;
1013 SKIP_BITS(re, &s->gb, 2);
1014 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1015 i+= run + rl->max_run[run>>7][level/qmul] +1; //FIXME opt indexing
1016 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1017 LAST_SKIP_BITS(re, &s->gb, 1);
1021 SKIP_BITS(re, &s->gb, 1);
1022 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1024 level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
1025 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1026 LAST_SKIP_BITS(re, &s->gb, 1);
1031 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1032 LAST_SKIP_BITS(re, &s->gb, 1);
1037 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1041 block[scan_table[i]] = level;
1045 block[scan_table[i]] = level;
1047 CLOSE_READER(re, &s->gb);
1051 if(!s->use_intra_dc_vlc){
1052 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1054 i -= i>>31; //if(i == -1) i=0;
1057 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1059 i = 63; /* XXX: not optimal */
1062 s->block_last_index[n] = i;
1067 * decode partition C of one MB.
1068 * @return <0 if an error occurred
1070 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1073 const int xy= s->mb_x + s->mb_y*s->mb_stride;
1075 mb_type = s->current_picture.mb_type[xy];
1076 cbp = s->cbp_table[xy];
1078 s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
1080 if (s->current_picture.qscale_table[xy] != s->qscale) {
1081 ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1084 if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type==AV_PICTURE_TYPE_S) {
1087 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1088 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1090 s->mb_intra = IS_INTRA(mb_type);
1092 if (IS_SKIP(mb_type)) {
1095 s->block_last_index[i] = -1;
1096 s->mv_dir = MV_DIR_FORWARD;
1097 s->mv_type = MV_TYPE_16X16;
1098 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
1105 }else if(s->mb_intra){
1106 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1107 }else if(!s->mb_intra){
1108 // s->mcsel= 0; //FIXME do we need to init that
1110 s->mv_dir = MV_DIR_FORWARD;
1111 if (IS_8X8(mb_type)) {
1112 s->mv_type = MV_TYPE_8X8;
1114 s->mv_type = MV_TYPE_16X16;
1117 } else { /* I-Frame */
1119 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1122 if (!IS_SKIP(mb_type)) {
1124 s->dsp.clear_blocks(s->block[0]);
1125 /* decode each block */
1126 for (i = 0; i < 6; i++) {
1127 if(mpeg4_decode_block(s, block[i], i, cbp&32, s->mb_intra, s->rvlc) < 0){
1128 av_log(s->avctx, AV_LOG_ERROR, "texture corrupted at %d %d %d\n", s->mb_x, s->mb_y, s->mb_intra);
1135 /* per-MB end of slice check */
1137 if(--s->mb_num_left <= 0){
1138 if(mpeg4_is_resync(s))
1143 if(mpeg4_is_resync(s)){
1144 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1145 if(s->cbp_table[xy+delta])
1152 static int mpeg4_decode_mb(MpegEncContext *s,
1153 int16_t block[6][64])
1155 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1157 static int8_t quant_tab[4] = { -1, -2, 1, 2 };
1158 const int xy= s->mb_x + s->mb_y * s->mb_stride;
1160 assert(s->h263_pred);
1162 if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type==AV_PICTURE_TYPE_S) {
1164 if (get_bits1(&s->gb)) {
1168 s->block_last_index[i] = -1;
1169 s->mv_dir = MV_DIR_FORWARD;
1170 s->mv_type = MV_TYPE_16X16;
1171 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
1172 s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
1174 s->mv[0][0][0]= get_amv(s, 0);
1175 s->mv[0][0][1]= get_amv(s, 1);
1179 s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
1187 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1189 av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1194 s->dsp.clear_blocks(s->block[0]);
1196 s->mb_intra = ((cbpc & 4) != 0);
1197 if (s->mb_intra) goto intra;
1199 if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
1200 s->mcsel= get_bits1(&s->gb);
1202 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1204 cbp = (cbpc & 3) | (cbpy << 2);
1206 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1208 if((!s->progressive_sequence) && (cbp || (s->workaround_bugs&FF_BUG_XVID_ILACE)))
1209 s->interlaced_dct= get_bits1(&s->gb);
1211 s->mv_dir = MV_DIR_FORWARD;
1212 if ((cbpc & 16) == 0) {
1214 s->current_picture.mb_type[xy] = MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
1215 /* 16x16 global motion prediction */
1216 s->mv_type = MV_TYPE_16X16;
1219 s->mv[0][0][0] = mx;
1220 s->mv[0][0][1] = my;
1221 }else if((!s->progressive_sequence) && get_bits1(&s->gb)){
1222 s->current_picture.mb_type[xy] = MB_TYPE_16x8 | MB_TYPE_L0 | MB_TYPE_INTERLACED;
1223 /* 16x8 field motion prediction */
1224 s->mv_type= MV_TYPE_FIELD;
1226 s->field_select[0][0]= get_bits1(&s->gb);
1227 s->field_select[0][1]= get_bits1(&s->gb);
1229 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1232 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1236 my = ff_h263_decode_motion(s, pred_y/2, s->f_code);
1240 s->mv[0][i][0] = mx;
1241 s->mv[0][i][1] = my;
1244 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1245 /* 16x16 motion prediction */
1246 s->mv_type = MV_TYPE_16X16;
1247 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1248 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1253 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1257 s->mv[0][0][0] = mx;
1258 s->mv[0][0][1] = my;
1261 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1262 s->mv_type = MV_TYPE_8X8;
1264 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1265 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1269 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1272 s->mv[0][i][0] = mx;
1273 s->mv[0][i][1] = my;
1278 } else if(s->pict_type==AV_PICTURE_TYPE_B) {
1279 int modb1; // first bit of modb
1280 int modb2; // second bit of modb
1283 s->mb_intra = 0; //B-frames never contain intra blocks
1284 s->mcsel=0; // ... true gmc blocks
1288 s->last_mv[i][0][0]=
1289 s->last_mv[i][0][1]=
1290 s->last_mv[i][1][0]=
1291 s->last_mv[i][1][1]= 0;
1294 ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1297 /* if we skipped it in the future P Frame than skip it now too */
1298 s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1303 s->block_last_index[i] = -1;
1305 s->mv_dir = MV_DIR_FORWARD;
1306 s->mv_type = MV_TYPE_16X16;
1311 s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
1315 modb1= get_bits1(&s->gb);
1317 mb_type= MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1; //like MB_TYPE_B_DIRECT but no vectors coded
1320 modb2= get_bits1(&s->gb);
1321 mb_type= get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1323 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1326 mb_type= mb_type_b_map[ mb_type ];
1329 s->dsp.clear_blocks(s->block[0]);
1330 cbp= get_bits(&s->gb, 6);
1333 if ((!IS_DIRECT(mb_type)) && cbp) {
1334 if(get_bits1(&s->gb)){
1335 ff_set_qscale(s, s->qscale + get_bits1(&s->gb)*4 - 2);
1339 if(!s->progressive_sequence){
1341 s->interlaced_dct= get_bits1(&s->gb);
1343 if(!IS_DIRECT(mb_type) && get_bits1(&s->gb)){
1344 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1345 mb_type &= ~MB_TYPE_16x16;
1347 if(USES_LIST(mb_type, 0)){
1348 s->field_select[0][0]= get_bits1(&s->gb);
1349 s->field_select[0][1]= get_bits1(&s->gb);
1351 if(USES_LIST(mb_type, 1)){
1352 s->field_select[1][0]= get_bits1(&s->gb);
1353 s->field_select[1][1]= get_bits1(&s->gb);
1359 if((mb_type & (MB_TYPE_DIRECT2|MB_TYPE_INTERLACED)) == 0){
1360 s->mv_type= MV_TYPE_16X16;
1362 if(USES_LIST(mb_type, 0)){
1363 s->mv_dir = MV_DIR_FORWARD;
1365 mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1366 my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1367 s->last_mv[0][1][0]= s->last_mv[0][0][0]= s->mv[0][0][0] = mx;
1368 s->last_mv[0][1][1]= s->last_mv[0][0][1]= s->mv[0][0][1] = my;
1371 if(USES_LIST(mb_type, 1)){
1372 s->mv_dir |= MV_DIR_BACKWARD;
1374 mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1375 my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1376 s->last_mv[1][1][0]= s->last_mv[1][0][0]= s->mv[1][0][0] = mx;
1377 s->last_mv[1][1][1]= s->last_mv[1][0][1]= s->mv[1][0][1] = my;
1379 }else if(!IS_DIRECT(mb_type)){
1380 s->mv_type= MV_TYPE_FIELD;
1382 if(USES_LIST(mb_type, 0)){
1383 s->mv_dir = MV_DIR_FORWARD;
1386 mx = ff_h263_decode_motion(s, s->last_mv[0][i][0] , s->f_code);
1387 my = ff_h263_decode_motion(s, s->last_mv[0][i][1]/2, s->f_code);
1388 s->last_mv[0][i][0]= s->mv[0][i][0] = mx;
1389 s->last_mv[0][i][1]= (s->mv[0][i][1] = my)*2;
1393 if(USES_LIST(mb_type, 1)){
1394 s->mv_dir |= MV_DIR_BACKWARD;
1397 mx = ff_h263_decode_motion(s, s->last_mv[1][i][0] , s->b_code);
1398 my = ff_h263_decode_motion(s, s->last_mv[1][i][1]/2, s->b_code);
1399 s->last_mv[1][i][0]= s->mv[1][i][0] = mx;
1400 s->last_mv[1][i][1]= (s->mv[1][i][1] = my)*2;
1406 if(IS_DIRECT(mb_type)){
1407 if(IS_SKIP(mb_type))
1410 mx = ff_h263_decode_motion(s, 0, 1);
1411 my = ff_h263_decode_motion(s, 0, 1);
1414 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1415 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1417 s->current_picture.mb_type[xy] = mb_type;
1418 } else { /* I-Frame */
1420 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1422 av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1430 s->ac_pred = get_bits1(&s->gb);
1432 s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1434 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1436 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1438 av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1441 cbp = (cbpc & 3) | (cbpy << 2);
1443 s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
1446 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1449 if(!s->progressive_sequence)
1450 s->interlaced_dct= get_bits1(&s->gb);
1452 s->dsp.clear_blocks(s->block[0]);
1453 /* decode each block */
1454 for (i = 0; i < 6; i++) {
1455 if (mpeg4_decode_block(s, block[i], i, cbp&32, 1, 0) < 0)
1462 /* decode each block */
1463 for (i = 0; i < 6; i++) {
1464 if (mpeg4_decode_block(s, block[i], i, cbp&32, 0, 0) < 0)
1470 /* per-MB end of slice check */
1471 if(s->codec_id==AV_CODEC_ID_MPEG4){
1472 if(mpeg4_is_resync(s)){
1473 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1475 if (s->pict_type == AV_PICTURE_TYPE_B && s->next_picture.mbskip_table[xy + delta]) {
1476 ff_thread_await_progress(&s->next_picture_ptr->tf,
1477 (s->mb_x + delta >= s->mb_width) ? FFMIN(s->mb_y+1, s->mb_height-1) : s->mb_y, 0);
1480 if (s->pict_type == AV_PICTURE_TYPE_B && s->next_picture.mbskip_table[xy + delta])
1490 static int mpeg4_decode_gop_header(MpegEncContext * s, GetBitContext *gb){
1491 int hours, minutes, seconds;
1492 unsigned time_code = show_bits(gb, 18);
1494 if (time_code & 0x40) { /* marker_bit */
1495 hours = time_code >> 13;
1496 minutes = time_code >> 7 & 0x3f;
1497 seconds = time_code & 0x3f;
1498 s->time_base = seconds + 60*(minutes + 60*hours);
1499 skip_bits(gb, 20); /* time_code, closed_gov, broken_link */
1501 av_log(s->avctx, AV_LOG_WARNING, "GOP header missing marker_bit\n");
1507 static int mpeg4_decode_profile_level(MpegEncContext * s, GetBitContext *gb){
1508 int profile_and_level_indication;
1510 profile_and_level_indication = get_bits(gb, 8);
1512 s->avctx->profile = (profile_and_level_indication & 0xf0) >> 4;
1513 s->avctx->level = (profile_and_level_indication & 0x0f);
1515 // for Simple profile, level 0
1516 if (s->avctx->profile == 0 && s->avctx->level == 8) {
1517 s->avctx->level = 0;
1523 static int decode_vol_header(MpegEncContext *s, GetBitContext *gb){
1524 int width, height, vo_ver_id;
1527 skip_bits(gb, 1); /* random access */
1528 s->vo_type= get_bits(gb, 8);
1529 if (get_bits1(gb) != 0) { /* is_ol_id */
1530 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1531 skip_bits(gb, 3); /* vo_priority */
1535 s->aspect_ratio_info= get_bits(gb, 4);
1536 if(s->aspect_ratio_info == FF_ASPECT_EXTENDED){
1537 s->avctx->sample_aspect_ratio.num= get_bits(gb, 8); // par_width
1538 s->avctx->sample_aspect_ratio.den= get_bits(gb, 8); // par_height
1540 s->avctx->sample_aspect_ratio= ff_h263_pixel_aspect[s->aspect_ratio_info];
1543 if ((s->vol_control_parameters=get_bits1(gb))) { /* vol control parameter */
1544 int chroma_format= get_bits(gb, 2);
1545 if(chroma_format!=CHROMA_420){
1546 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1548 s->low_delay= get_bits1(gb);
1549 if(get_bits1(gb)){ /* vbv parameters */
1550 get_bits(gb, 15); /* first_half_bitrate */
1551 skip_bits1(gb); /* marker */
1552 get_bits(gb, 15); /* latter_half_bitrate */
1553 skip_bits1(gb); /* marker */
1554 get_bits(gb, 15); /* first_half_vbv_buffer_size */
1555 skip_bits1(gb); /* marker */
1556 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1557 get_bits(gb, 11); /* first_half_vbv_occupancy */
1558 skip_bits1(gb); /* marker */
1559 get_bits(gb, 15); /* latter_half_vbv_occupancy */
1560 skip_bits1(gb); /* marker */
1563 // set low delay flag only once the smartest? low delay detection won't be overriden
1564 if(s->picture_number==0)
1568 s->shape = get_bits(gb, 2); /* vol shape */
1569 if(s->shape != RECT_SHAPE) av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1570 if(s->shape == GRAY_SHAPE && vo_ver_id != 1){
1571 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1572 skip_bits(gb, 4); //video_object_layer_shape_extension
1575 check_marker(gb, "before time_increment_resolution");
1577 s->avctx->time_base.den = get_bits(gb, 16);
1578 if(!s->avctx->time_base.den){
1579 av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n");
1580 s->avctx->time_base.num = 0;
1584 s->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
1585 if (s->time_increment_bits < 1)
1586 s->time_increment_bits = 1;
1588 check_marker(gb, "before fixed_vop_rate");
1590 if (get_bits1(gb) != 0) { /* fixed_vop_rate */
1591 s->avctx->time_base.num = get_bits(gb, s->time_increment_bits);
1593 s->avctx->time_base.num = 1;
1597 if (s->shape != BIN_ONLY_SHAPE) {
1598 if (s->shape == RECT_SHAPE) {
1599 skip_bits1(gb); /* marker */
1600 width = get_bits(gb, 13);
1601 skip_bits1(gb); /* marker */
1602 height = get_bits(gb, 13);
1603 skip_bits1(gb); /* marker */
1604 if(width && height && !(s->width && s->codec_tag == AV_RL32("MP4S"))){ /* they should be non zero but who knows ... */
1605 if (s->width && s->height &&
1606 (s->width != width || s->height != height))
1607 s->context_reinit = 1;
1613 s->progressive_sequence=
1614 s->progressive_frame= get_bits1(gb)^1;
1615 s->interlaced_dct=0;
1616 if(!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1617 av_log(s->avctx, AV_LOG_INFO, "MPEG4 OBMC not supported (very likely buggy encoder)\n"); /* OBMC Disable */
1618 if (vo_ver_id == 1) {
1619 s->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1621 s->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1623 if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1624 if(s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE){
1625 if(s->vol_sprite_usage==STATIC_SPRITE){
1626 s->sprite_width = get_bits(gb, 13);
1627 skip_bits1(gb); /* marker */
1628 s->sprite_height= get_bits(gb, 13);
1629 skip_bits1(gb); /* marker */
1630 s->sprite_left = get_bits(gb, 13);
1631 skip_bits1(gb); /* marker */
1632 s->sprite_top = get_bits(gb, 13);
1633 skip_bits1(gb); /* marker */
1635 s->num_sprite_warping_points= get_bits(gb, 6);
1636 if(s->num_sprite_warping_points > 3){
1637 av_log(s->avctx, AV_LOG_ERROR, "%d sprite_warping_points\n", s->num_sprite_warping_points);
1638 s->num_sprite_warping_points= 0;
1641 s->sprite_warping_accuracy = get_bits(gb, 2);
1642 s->sprite_brightness_change= get_bits1(gb);
1643 if(s->vol_sprite_usage==STATIC_SPRITE)
1644 s->low_latency_sprite= get_bits1(gb);
1646 // FIXME sadct disable bit if verid!=1 && shape not rect
1648 if (get_bits1(gb) == 1) { /* not_8_bit */
1649 s->quant_precision = get_bits(gb, 4); /* quant_precision */
1650 if(get_bits(gb, 4)!=8) av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n"); /* bits_per_pixel */
1651 if(s->quant_precision!=5) av_log(s->avctx, AV_LOG_ERROR, "quant precision %d\n", s->quant_precision);
1653 s->quant_precision = 5;
1656 // FIXME a bunch of grayscale shape things
1658 if((s->mpeg_quant=get_bits1(gb))){ /* vol_quant_type */
1661 /* load default matrixes */
1662 for(i=0; i<64; i++){
1663 int j= s->dsp.idct_permutation[i];
1664 v= ff_mpeg4_default_intra_matrix[i];
1665 s->intra_matrix[j]= v;
1666 s->chroma_intra_matrix[j]= v;
1668 v= ff_mpeg4_default_non_intra_matrix[i];
1669 s->inter_matrix[j]= v;
1670 s->chroma_inter_matrix[j]= v;
1673 /* load custom intra matrix */
1676 for(i=0; i<64; i++){
1682 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1683 s->intra_matrix[j]= v;
1684 s->chroma_intra_matrix[j]= v;
1687 /* replicate last value */
1689 int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1690 s->intra_matrix[j]= last;
1691 s->chroma_intra_matrix[j]= last;
1695 /* load custom non intra matrix */
1698 for(i=0; i<64; i++){
1704 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1705 s->inter_matrix[j]= v;
1706 s->chroma_inter_matrix[j]= v;
1709 /* replicate last value */
1711 int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1712 s->inter_matrix[j]= last;
1713 s->chroma_inter_matrix[j]= last;
1717 // FIXME a bunch of grayscale shape things
1721 s->quarter_sample= get_bits1(gb);
1722 else s->quarter_sample=0;
1725 int pos= get_bits_count(gb);
1726 int estimation_method= get_bits(gb, 2);
1727 if(estimation_method<2){
1729 s->cplx_estimation_trash_i += 8*get_bits1(gb); //opaque
1730 s->cplx_estimation_trash_i += 8*get_bits1(gb); //transparent
1731 s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_cae
1732 s->cplx_estimation_trash_i += 8*get_bits1(gb); //inter_cae
1733 s->cplx_estimation_trash_i += 8*get_bits1(gb); //no_update
1734 s->cplx_estimation_trash_i += 8*get_bits1(gb); //upampling
1737 s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_blocks
1738 s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter_blocks
1739 s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter4v_blocks
1740 s->cplx_estimation_trash_i += 8*get_bits1(gb); //not coded blocks
1742 if(!check_marker(gb, "in complexity estimation part 1")){
1743 skip_bits_long(gb, pos - get_bits_count(gb));
1747 s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_coeffs
1748 s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_lines
1749 s->cplx_estimation_trash_i += 8*get_bits1(gb); //vlc_syms
1750 s->cplx_estimation_trash_i += 4*get_bits1(gb); //vlc_bits
1753 s->cplx_estimation_trash_p += 8*get_bits1(gb); //apm
1754 s->cplx_estimation_trash_p += 8*get_bits1(gb); //npm
1755 s->cplx_estimation_trash_b += 8*get_bits1(gb); //interpolate_mc_q
1756 s->cplx_estimation_trash_p += 8*get_bits1(gb); //forwback_mc_q
1757 s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel2
1758 s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel4
1760 if(!check_marker(gb, "in complexity estimation part 2")){
1761 skip_bits_long(gb, pos - get_bits_count(gb));
1764 if(estimation_method==1){
1765 s->cplx_estimation_trash_i += 8*get_bits1(gb); //sadct
1766 s->cplx_estimation_trash_p += 8*get_bits1(gb); //qpel
1769 av_log(s->avctx, AV_LOG_ERROR, "Invalid Complexity estimation method %d\n", estimation_method);
1772 s->cplx_estimation_trash_i=
1773 s->cplx_estimation_trash_p=
1774 s->cplx_estimation_trash_b= 0;
1777 s->resync_marker= !get_bits1(gb); /* resync_marker_disabled */
1779 s->data_partitioning= get_bits1(gb);
1780 if(s->data_partitioning){
1781 s->rvlc= get_bits1(gb);
1784 if(vo_ver_id != 1) {
1785 s->new_pred= get_bits1(gb);
1787 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
1788 skip_bits(gb, 2); /* requested upstream message type */
1789 skip_bits1(gb); /* newpred segment type */
1791 s->reduced_res_vop= get_bits1(gb);
1792 if(s->reduced_res_vop) av_log(s->avctx, AV_LOG_ERROR, "reduced resolution VOP not supported\n");
1796 s->reduced_res_vop= 0;
1799 s->scalability= get_bits1(gb);
1801 if (s->scalability) {
1802 GetBitContext bak= *gb;
1803 int h_sampling_factor_n;
1804 int h_sampling_factor_m;
1805 int v_sampling_factor_n;
1806 int v_sampling_factor_m;
1808 s->hierachy_type= get_bits1(gb);
1809 skip_bits(gb, 4); /* ref_layer_id */
1810 skip_bits1(gb); /* ref_layer_sampling_dir */
1811 h_sampling_factor_n= get_bits(gb, 5);
1812 h_sampling_factor_m= get_bits(gb, 5);
1813 v_sampling_factor_n= get_bits(gb, 5);
1814 v_sampling_factor_m= get_bits(gb, 5);
1815 s->enhancement_type= get_bits1(gb);
1817 if( h_sampling_factor_n==0 || h_sampling_factor_m==0
1818 || v_sampling_factor_n==0 || v_sampling_factor_m==0){
1819 /* illegal scalability header (VERY broken encoder),
1820 * trying to workaround */
1824 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
1826 // bin shape stuff FIXME
1833 * Decode the user data stuff in the header.
1834 * Also initializes divx/xvid/lavc_version/build.
1836 static int decode_user_data(MpegEncContext *s, GetBitContext *gb){
1840 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
1843 for(i=0; i<255 && get_bits_count(gb) < gb->size_in_bits; i++){
1844 if(show_bits(gb, 23) == 0) break;
1845 buf[i]= get_bits(gb, 8);
1849 /* divx detection */
1850 e=sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
1852 e=sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
1854 s->divx_version= ver;
1855 s->divx_build= build;
1856 s->divx_packed= e==3 && last=='p';
1857 if(s->divx_packed && !s->showed_packed_warning) {
1858 av_log(s->avctx, AV_LOG_WARNING, "Invalid and inefficient vfw-avi packed B frames detected\n");
1859 s->showed_packed_warning=1;
1863 /* libavcodec detection */
1864 e=sscanf(buf, "FFmpe%*[^b]b%d", &build)+3;
1866 e=sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
1868 e=sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3)+1;
1870 build= (ver<<16) + (ver2<<8) + ver3;
1873 if(strcmp(buf, "ffmpeg")==0){
1874 s->lavc_build= 4600;
1878 s->lavc_build= build;
1881 /* Xvid detection */
1882 e=sscanf(buf, "XviD%d", &build);
1884 s->xvid_build= build;
1890 static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
1891 int time_incr, time_increment;
1893 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
1894 if(s->pict_type==AV_PICTURE_TYPE_B && s->low_delay && s->vol_control_parameters==0 && !(s->flags & CODEC_FLAG_LOW_DELAY)){
1895 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n");
1899 s->partitioned_frame= s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_B;
1900 if(s->partitioned_frame)
1901 s->decode_mb= mpeg4_decode_partitioned_mb;
1903 s->decode_mb= mpeg4_decode_mb;
1906 while (get_bits1(gb) != 0)
1909 check_marker(gb, "before time_increment");
1911 if(s->time_increment_bits==0 || !(show_bits(gb, s->time_increment_bits+1)&1)){
1912 av_log(s->avctx, AV_LOG_ERROR, "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
1914 for(s->time_increment_bits=1 ;s->time_increment_bits<16; s->time_increment_bits++){
1915 if ( s->pict_type == AV_PICTURE_TYPE_P
1916 || (s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE)) {
1917 if((show_bits(gb, s->time_increment_bits+6)&0x37) == 0x30) break;
1919 if((show_bits(gb, s->time_increment_bits+5)&0x1F) == 0x18) break;
1922 av_log(s->avctx, AV_LOG_ERROR, "my guess is %d bits ;)\n",s->time_increment_bits);
1925 if(IS_3IV1) time_increment= get_bits1(gb); //FIXME investigate further
1926 else time_increment= get_bits(gb, s->time_increment_bits);
1928 if(s->pict_type!=AV_PICTURE_TYPE_B){
1929 s->last_time_base= s->time_base;
1930 s->time_base+= time_incr;
1931 s->time= s->time_base*s->avctx->time_base.den + time_increment;
1932 if(s->workaround_bugs&FF_BUG_UMP4){
1933 if(s->time < s->last_non_b_time){
1934 /* header is not mpeg-4-compatible, broken encoder,
1935 * trying to workaround */
1937 s->time+= s->avctx->time_base.den;
1940 s->pp_time= s->time - s->last_non_b_time;
1941 s->last_non_b_time= s->time;
1943 s->time= (s->last_time_base + time_incr)*s->avctx->time_base.den + time_increment;
1944 s->pb_time= s->pp_time - (s->last_non_b_time - s->time);
1945 if(s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0){
1946 /* messed up order, maybe after seeking? skipping current b-frame */
1947 return FRAME_SKIPPED;
1949 ff_mpeg4_init_direct_mv(s);
1951 if(s->t_frame==0) s->t_frame= s->pb_time;
1952 if(s->t_frame==0) s->t_frame=1; // 1/0 protection
1953 s->pp_field_time= ( ROUNDED_DIV(s->last_non_b_time, s->t_frame)
1954 - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
1955 s->pb_field_time= ( ROUNDED_DIV(s->time, s->t_frame)
1956 - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
1957 if(!s->progressive_sequence){
1958 if(s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1)
1959 return FRAME_SKIPPED;
1963 if(s->avctx->time_base.num)
1964 s->current_picture_ptr->f.pts = (s->time + s->avctx->time_base.num / 2) / s->avctx->time_base.num;
1966 s->current_picture_ptr->f.pts = AV_NOPTS_VALUE;
1967 if(s->avctx->debug&FF_DEBUG_PTS)
1968 av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n",
1969 s->current_picture_ptr->f.pts);
1971 check_marker(gb, "before vop_coded");
1974 if (get_bits1(gb) != 1){
1975 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
1976 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
1977 return FRAME_SKIPPED;
1979 if (s->shape != BIN_ONLY_SHAPE && ( s->pict_type == AV_PICTURE_TYPE_P
1980 || (s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE))) {
1981 /* rounding type for motion estimation */
1982 s->no_rounding = get_bits1(gb);
1986 //FIXME reduced res stuff
1988 if (s->shape != RECT_SHAPE) {
1989 if (s->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
1990 skip_bits(gb, 13); /* width */
1991 skip_bits1(gb); /* marker */
1992 skip_bits(gb, 13); /* height */
1993 skip_bits1(gb); /* marker */
1994 skip_bits(gb, 13); /* hor_spat_ref */
1995 skip_bits1(gb); /* marker */
1996 skip_bits(gb, 13); /* ver_spat_ref */
1998 skip_bits1(gb); /* change_CR_disable */
2000 if (get_bits1(gb) != 0) {
2001 skip_bits(gb, 8); /* constant_alpha_value */
2004 //FIXME complexity estimation stuff
2006 if (s->shape != BIN_ONLY_SHAPE) {
2007 skip_bits_long(gb, s->cplx_estimation_trash_i);
2008 if(s->pict_type != AV_PICTURE_TYPE_I)
2009 skip_bits_long(gb, s->cplx_estimation_trash_p);
2010 if(s->pict_type == AV_PICTURE_TYPE_B)
2011 skip_bits_long(gb, s->cplx_estimation_trash_b);
2013 s->intra_dc_threshold= ff_mpeg4_dc_threshold[ get_bits(gb, 3) ];
2014 if(!s->progressive_sequence){
2015 s->top_field_first= get_bits1(gb);
2016 s->alternate_scan= get_bits1(gb);
2018 s->alternate_scan= 0;
2021 if(s->alternate_scan){
2022 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
2023 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
2024 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2025 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2027 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
2028 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
2029 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2030 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2033 if(s->pict_type == AV_PICTURE_TYPE_S && (s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE)){
2034 mpeg4_decode_sprite_trajectory(s, gb);
2035 if(s->sprite_brightness_change) av_log(s->avctx, AV_LOG_ERROR, "sprite_brightness_change not supported\n");
2036 if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2039 if (s->shape != BIN_ONLY_SHAPE) {
2040 s->chroma_qscale= s->qscale = get_bits(gb, s->quant_precision);
2042 av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (qscale=0)\n");
2043 return -1; // makes no sense to continue, as there is nothing left from the image then
2046 if (s->pict_type != AV_PICTURE_TYPE_I) {
2047 s->f_code = get_bits(gb, 3); /* fcode_for */
2049 av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (f_code=0)\n");
2050 return -1; // makes no sense to continue, as the MV decoding will break very quickly
2055 if (s->pict_type == AV_PICTURE_TYPE_B) {
2056 s->b_code = get_bits(gb, 3);
2060 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2061 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",
2062 s->qscale, s->f_code, s->b_code,
2063 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")),
2064 gb->size_in_bits,s->progressive_sequence, s->alternate_scan, s->top_field_first,
2065 s->quarter_sample ? "q" : "h", s->data_partitioning, s->resync_marker, s->num_sprite_warping_points,
2066 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);
2069 if(!s->scalability){
2070 if (s->shape!=RECT_SHAPE && s->pict_type!=AV_PICTURE_TYPE_I) {
2071 skip_bits1(gb); // vop shape coding type
2074 if(s->enhancement_type){
2075 int load_backward_shape= get_bits1(gb);
2076 if(load_backward_shape){
2077 av_log(s->avctx, AV_LOG_ERROR, "load backward shape isn't supported\n");
2080 skip_bits(gb, 2); //ref_select_code
2083 /* detect buggy encoders which don't set the low_delay flag (divx4/xvid/opendivx)*/
2084 // note we cannot detect divx5 without b-frames easily (although it's buggy too)
2085 if(s->vo_type==0 && s->vol_control_parameters==0 && s->divx_version==-1 && s->picture_number==0){
2086 av_log(s->avctx, AV_LOG_WARNING, "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2090 s->picture_number++; // better than pic number==0 always ;)
2092 s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table; //FIXME add short header support
2093 s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
2095 if(s->workaround_bugs&FF_BUG_EDGE){
2096 s->h_edge_pos= s->width;
2097 s->v_edge_pos= s->height;
2103 * Decode mpeg4 headers.
2104 * @return <0 if no VOP found (or a damaged one)
2105 * FRAME_SKIPPED if a not coded VOP is found
2106 * 0 if a VOP is found
2108 int ff_mpeg4_decode_picture_header(MpegEncContext * s, GetBitContext *gb)
2110 unsigned startcode, v;
2112 /* search next start code */
2115 if(s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630){
2117 if(get_bits(gb, 8) == 0xF0)
2123 if(get_bits_count(gb) >= gb->size_in_bits){
2124 if(gb->size_in_bits==8 && (s->divx_version>=0 || s->xvid_build>=0)){
2125 av_log(s->avctx, AV_LOG_WARNING, "frame skip %d\n", gb->size_in_bits);
2126 return FRAME_SKIPPED; //divx bug
2128 return -1; //end of stream
2131 /* use the bits after the test */
2132 v = get_bits(gb, 8);
2133 startcode = ((startcode << 8) | v) & 0xffffffff;
2135 if((startcode&0xFFFFFF00) != 0x100)
2136 continue; //no startcode
2138 if(s->avctx->debug&FF_DEBUG_STARTCODE){
2139 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2140 if (startcode<=0x11F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2141 else if(startcode<=0x12F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2142 else if(startcode<=0x13F) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2143 else if(startcode<=0x15F) av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2144 else if(startcode<=0x1AF) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2145 else if(startcode==0x1B0) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2146 else if(startcode==0x1B1) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2147 else if(startcode==0x1B2) av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2148 else if(startcode==0x1B3) av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2149 else if(startcode==0x1B4) av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2150 else if(startcode==0x1B5) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2151 else if(startcode==0x1B6) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2152 else if(startcode==0x1B7) av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2153 else if(startcode==0x1B8) av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2154 else if(startcode==0x1B9) av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2155 else if(startcode==0x1BA) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2156 else if(startcode==0x1BB) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2157 else if(startcode==0x1BC) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2158 else if(startcode==0x1BD) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2159 else if(startcode==0x1BE) av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2160 else if(startcode==0x1BF) av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2161 else if(startcode==0x1C0) av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2162 else if(startcode==0x1C1) av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2163 else if(startcode==0x1C2) av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2164 else if(startcode==0x1C3) av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2165 else if(startcode<=0x1C5) av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2166 else if(startcode<=0x1FF) av_log(s->avctx, AV_LOG_DEBUG, "System start");
2167 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2170 if(startcode >= 0x120 && startcode <= 0x12F){
2171 if(decode_vol_header(s, gb) < 0)
2174 else if(startcode == USER_DATA_STARTCODE){
2175 decode_user_data(s, gb);
2177 else if(startcode == GOP_STARTCODE){
2178 mpeg4_decode_gop_header(s, gb);
2180 else if(startcode == VOS_STARTCODE){
2181 mpeg4_decode_profile_level(s, gb);
2183 else if(startcode == VOP_STARTCODE){
2191 if(s->flags& CODEC_FLAG_LOW_DELAY)
2193 s->avctx->has_b_frames= !s->low_delay;
2194 return decode_vop_header(s, gb);
2197 static av_cold int decode_init(AVCodecContext *avctx)
2199 MpegEncContext *s = avctx->priv_data;
2201 static int done = 0;
2208 if((ret=ff_h263_decode_init(avctx)) < 0)
2214 ff_init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
2215 ff_init_rl(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
2216 ff_init_rl(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
2217 INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
2218 INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
2219 INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
2220 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2221 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2222 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2223 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2224 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2225 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2226 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2227 &ff_sprite_trajectory_tab[0][1], 4, 2,
2228 &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2229 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2230 &ff_mb_type_b_tab[0][1], 2, 1,
2231 &ff_mb_type_b_tab[0][0], 2, 1, 16);
2235 s->low_delay = 0; //default, might be overriden in the vol header during header parsing
2236 s->decode_mb= mpeg4_decode_mb;
2237 s->time_increment_bits = 4; /* default value for broken headers */
2238 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
2240 avctx->internal->allocate_progress = 1;
2245 static const AVProfile mpeg4_video_profiles[] = {
2246 { FF_PROFILE_MPEG4_SIMPLE, "Simple Profile" },
2247 { FF_PROFILE_MPEG4_SIMPLE_SCALABLE, "Simple Scalable Profile" },
2248 { FF_PROFILE_MPEG4_CORE, "Core Profile" },
2249 { FF_PROFILE_MPEG4_MAIN, "Main Profile" },
2250 { FF_PROFILE_MPEG4_N_BIT, "N-bit Profile" },
2251 { FF_PROFILE_MPEG4_SCALABLE_TEXTURE, "Scalable Texture Profile" },
2252 { FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION, "Simple Face Animation Profile" },
2253 { FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE, "Basic Animated Texture Profile" },
2254 { FF_PROFILE_MPEG4_HYBRID, "Hybrid Profile" },
2255 { FF_PROFILE_MPEG4_ADVANCED_REAL_TIME, "Advanced Real Time Simple Profile" },
2256 { FF_PROFILE_MPEG4_CORE_SCALABLE, "Code Scalable Profile" },
2257 { FF_PROFILE_MPEG4_ADVANCED_CODING, "Advanced Coding Profile" },
2258 { FF_PROFILE_MPEG4_ADVANCED_CORE, "Advanced Core Profile" },
2259 { FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" },
2260 { FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" },
2261 { FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" },
2264 AVCodec ff_mpeg4_decoder = {
2266 .type = AVMEDIA_TYPE_VIDEO,
2267 .id = AV_CODEC_ID_MPEG4,
2268 .priv_data_size = sizeof(MpegEncContext),
2269 .init = decode_init,
2270 .close = ff_h263_decode_end,
2271 .decode = ff_h263_decode_frame,
2272 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2273 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2274 CODEC_CAP_FRAME_THREADS,
2275 .flush = ff_mpeg_flush,
2276 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2277 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
2278 .profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
2279 .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_mpeg_update_thread_context),
2283 #if CONFIG_MPEG4_VDPAU_DECODER
2284 AVCodec ff_mpeg4_vdpau_decoder = {
2285 .name = "mpeg4_vdpau",
2286 .type = AVMEDIA_TYPE_VIDEO,
2287 .id = AV_CODEC_ID_MPEG4,
2288 .priv_data_size = sizeof(MpegEncContext),
2289 .init = decode_init,
2290 .close = ff_h263_decode_end,
2291 .decode = ff_h263_decode_frame,
2292 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2293 CODEC_CAP_HWACCEL_VDPAU,
2294 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2295 .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_VDPAU_MPEG4,