FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/ituh263dec.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 512 757 67.6%
Branches: 253 514 49.2%
Line Branch Exec Source
1 /*
2 * ITU H.263 bitstream decoder
3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * H.263+ support.
5 * Copyright (c) 2001 Juan J. Sierralta P
6 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
7 *
8 * This file is part of FFmpeg.
9 *
10 * FFmpeg is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
14 *
15 * FFmpeg is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25 /**
26 * @file
27 * H.263 decoder.
28 */
29
30 #define UNCHECKED_BITSTREAM_READER 1
31 #include <limits.h>
32
33 #include "libavutil/attributes.h"
34 #include "libavutil/imgutils.h"
35 #include "libavutil/internal.h"
36 #include "libavutil/mathematics.h"
37 #include "libavutil/mem_internal.h"
38 #include "avcodec.h"
39 #include "mpegvideo.h"
40 #include "h263.h"
41 #include "h263data.h"
42 #include "internal.h"
43 #include "mathops.h"
44 #include "mpegutils.h"
45 #include "unary.h"
46 #include "flv.h"
47 #include "rv10.h"
48 #include "mpeg4video.h"
49 #include "mpegvideodata.h"
50
51 // The defines below define the number of bits that are read at once for
52 // reading vlc values. Changing these may improve speed and data cache needs
53 // be aware though that decreasing them may need the number of stages that is
54 // passed to get_vlc* to be increased.
55 #define H263_MBTYPE_B_VLC_BITS 6
56 #define CBPC_B_VLC_BITS 3
57
58 static const int h263_mb_type_b_map[15]= {
59 MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
60 MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP,
61 MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT,
62 MB_TYPE_L0 | MB_TYPE_16x16,
63 MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_16x16,
64 MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
65 MB_TYPE_L1 | MB_TYPE_16x16,
66 MB_TYPE_L1 | MB_TYPE_CBP | MB_TYPE_16x16,
67 MB_TYPE_L1 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
68 MB_TYPE_L0L1 | MB_TYPE_16x16,
69 MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_16x16,
70 MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
71 0, //stuffing
72 MB_TYPE_INTRA4x4 | MB_TYPE_CBP,
73 MB_TYPE_INTRA4x4 | MB_TYPE_CBP | MB_TYPE_QUANT,
74 };
75
76 461 void ff_h263_show_pict_info(MpegEncContext *s){
77
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 461 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
78 ✗ av_log(s->avctx, AV_LOG_DEBUG, "qp:%d %c size:%d rnd:%d%s%s%s%s%s%s%s%s%s %d/%d\n",
79 ✗ s->qscale, av_get_picture_type_char(s->pict_type),
80 ✗ s->gb.size_in_bits, 1-s->no_rounding,
81 ✗ s->obmc ? " AP" : "",
82 ✗ s->umvplus ? " UMV" : "",
83 ✗ s->h263_long_vectors ? " LONG" : "",
84 ✗ s->h263_plus ? " +" : "",
85 ✗ s->h263_aic ? " AIC" : "",
86 ✗ s->alt_inter_vlc ? " AIV" : "",
87 ✗ s->modified_quant ? " MQ" : "",
88 ✗ s->loop_filter ? " LOOP" : "",
89 ✗ s->h263_slice_structured ? " SS" : "",
90 ✗ s->avctx->framerate.num, s->avctx->framerate.den
91 );
92 }
93 461 }
94
95 /***********************************************/
96 /* decoding */
97
98 VLC ff_h263_intra_MCBPC_vlc;
99 VLC ff_h263_inter_MCBPC_vlc;
100 VLC ff_h263_cbpy_vlc;
101 VLC ff_h263_mv_vlc;
102 static VLC h263_mbtype_b_vlc;
103 static VLC cbpc_b_vlc;
104
105 /* init vlcs */
106
107 /* XXX: find a better solution to handle static init */
108 303 av_cold void ff_h263_decode_init_vlc(void)
109 {
110 static volatile int done = 0;
111
112
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 303 if (!done) {
113 172 INIT_VLC_STATIC(&ff_h263_intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 9,
114 ff_h263_intra_MCBPC_bits, 1, 1,
115 ff_h263_intra_MCBPC_code, 1, 1, 72);
116 172 INIT_VLC_STATIC(&ff_h263_inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 28,
117 ff_h263_inter_MCBPC_bits, 1, 1,
118 ff_h263_inter_MCBPC_code, 1, 1, 198);
119 172 INIT_VLC_STATIC(&ff_h263_cbpy_vlc, CBPY_VLC_BITS, 16,
120 &ff_h263_cbpy_tab[0][1], 2, 1,
121 &ff_h263_cbpy_tab[0][0], 2, 1, 64);
122 172 INIT_VLC_STATIC(&ff_h263_mv_vlc, H263_MV_VLC_BITS, 33,
123 &ff_mvtab[0][1], 2, 1,
124 &ff_mvtab[0][0], 2, 1, 538);
125 172 ff_h263_init_rl_inter();
126
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 5676 INIT_VLC_RL(ff_h263_rl_inter, 554);
127 172 INIT_FIRST_VLC_RL(ff_rl_intra_aic, 554);
128 172 INIT_VLC_STATIC(&h263_mbtype_b_vlc, H263_MBTYPE_B_VLC_BITS, 15,
129 &ff_h263_mbtype_b_tab[0][1], 2, 1,
130 &ff_h263_mbtype_b_tab[0][0], 2, 1, 80);
131 172 INIT_VLC_STATIC(&cbpc_b_vlc, CBPC_B_VLC_BITS, 4,
132 &ff_cbpc_b_tab[0][1], 2, 1,
133 &ff_cbpc_b_tab[0][0], 2, 1, 8);
134 172 done = 1;
135 }
136 303 }
137
138 742 int ff_h263_decode_mba(MpegEncContext *s)
139 {
140 int i, mb_pos;
141
142
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143
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 2226 if (s->mb_num - 1 <= ff_mba_max[i])
144 742 break;
145 742 mb_pos = get_bits(&s->gb, ff_mba_length[i]);
146 742 s->mb_x = mb_pos % s->mb_width;
147 742 s->mb_y = mb_pos / s->mb_width;
148
149 742 return mb_pos;
150 }
151
152 /**
153 * Decode the group of blocks header or slice header.
154 * @return <0 if an error occurred
155 */
156 2544 static int h263_decode_gob_header(MpegEncContext *s)
157 {
158 unsigned int val, gob_number;
159 int left;
160
161 /* Check for GOB Start Code */
162 2544 val = show_bits(&s->gb, 16);
163
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 2544 if(val)
164 ✗ return -1;
165
166 /* We have a GBSC probably with GSTUFF */
167 2544 skip_bits(&s->gb, 16); /* Drop the zeros */
168 2544 left= get_bits_left(&s->gb);
169 2544 left = FFMIN(left, 32);
170 //MN: we must check the bits left or we might end in an infinite loop (or segfault)
171
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 11538 for(;left>13; left--){
172
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 11538 if(get_bits1(&s->gb)) break; /* Seek the '1' bit */
173 }
174
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 2544 if(left<=13)
175 ✗ return -1;
176
177
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 2544 if(s->h263_slice_structured){
178 ✗ if(check_marker(s->avctx, &s->gb, "before MBA")==0)
179 ✗ return -1;
180
181 ✗ ff_h263_decode_mba(s);
182
183 ✗ if(s->mb_num > 1583)
184 ✗ if(check_marker(s->avctx, &s->gb, "after MBA")==0)
185 ✗ return -1;
186
187 ✗ s->qscale = get_bits(&s->gb, 5); /* SQUANT */
188 ✗ if(check_marker(s->avctx, &s->gb, "after SQUANT")==0)
189 ✗ return -1;
190 ✗ skip_bits(&s->gb, 2); /* GFID */
191 }else{
192 2544 gob_number = get_bits(&s->gb, 5); /* GN */
193 2544 s->mb_x= 0;
194 2544 s->mb_y= s->gob_index* gob_number;
195 2544 skip_bits(&s->gb, 2); /* GFID */
196 2544 s->qscale = get_bits(&s->gb, 5); /* GQUANT */
197 }
198
199
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 2544 if(s->mb_y >= s->mb_height)
200 ✗ return -1;
201
202
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 2544 if(s->qscale==0)
203 ✗ return -1;
204
205 2544 return 0;
206 }
207
208 /**
209 * Decode the group of blocks / video packet header / slice header (MPEG-4 Studio).
210 * @return bit position of the resync_marker, or <0 if none was found
211 */
212 6411 int ff_h263_resync(MpegEncContext *s){
213 int left, pos, ret;
214
215 /* In MPEG-4 studio mode look for a new slice startcode
216 * and decode slice header */
217
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 6411 if(s->codec_id==AV_CODEC_ID_MPEG4 && s->studio_profile) {
218 ✗ align_get_bits(&s->gb);
219
220 ✗ while (get_bits_left(&s->gb) >= 32 && show_bits_long(&s->gb, 32) != SLICE_STARTCODE) {
221 ✗ get_bits(&s->gb, 8);
222 }
223
224 ✗ if (get_bits_left(&s->gb) >= 32 && show_bits_long(&s->gb, 32) == SLICE_STARTCODE)
225 ✗ return get_bits_count(&s->gb);
226 else
227 ✗ return -1;
228 }
229
230
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 6411 if(s->codec_id==AV_CODEC_ID_MPEG4){
231 3867 skip_bits1(&s->gb);
232 3867 align_get_bits(&s->gb);
233 }
234
235
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 6411 if(show_bits(&s->gb, 16)==0){
236 6411 pos= get_bits_count(&s->gb);
237
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 6411 if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4)
238 3867 ret= ff_mpeg4_decode_video_packet_header(s->avctx->priv_data);
239 else
240 2544 ret= h263_decode_gob_header(s);
241
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 6411 if(ret>=0)
242 6411 return pos;
243 }
244 //OK, it's not where it is supposed to be ...
245 ✗ s->gb= s->last_resync_gb;
246 ✗ align_get_bits(&s->gb);
247 ✗ left= get_bits_left(&s->gb);
248
249 ✗ for(;left>16+1+5+5; left-=8){
250 ✗ if(show_bits(&s->gb, 16)==0){
251 ✗ GetBitContext bak= s->gb;
252
253 ✗ pos= get_bits_count(&s->gb);
254 ✗ if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4)
255 ✗ ret= ff_mpeg4_decode_video_packet_header(s->avctx->priv_data);
256 else
257 ✗ ret= h263_decode_gob_header(s);
258 ✗ if(ret>=0)
259 ✗ return pos;
260
261 ✗ s->gb= bak;
262 }
263 ✗ skip_bits(&s->gb, 8);
264 }
265
266 ✗ return -1;
267 }
268
269 3734438 int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code)
270 {
271 int code, val, sign, shift;
272 3734438 code = get_vlc2(&s->gb, ff_h263_mv_vlc.table, H263_MV_VLC_BITS, 2);
273
274
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 3734438 if (code == 0)
275 1837968 return pred;
276
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 1896470 if (code < 0)
277 ✗ return 0xffff;
278
279 1896470 sign = get_bits1(&s->gb);
280 1896470 shift = f_code - 1;
281 1896470 val = code;
282
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 1896470 if (shift) {
283 222315 val = (val - 1) << shift;
284 222315 val |= get_bits(&s->gb, shift);
285 222315 val++;
286 }
287
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 1896470 if (sign)
288 791305 val = -val;
289 1896470 val += pred;
290
291 /* modulo decoding */
292
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 1896470 if (!s->h263_long_vectors) {
293 1896470 val = sign_extend(val, 5 + f_code);
294 } else {
295 /* horrible H.263 long vector mode */
296 ✗ if (pred < -31 && val < -63)
297 ✗ val += 64;
298 ✗ if (pred > 32 && val > 63)
299 ✗ val -= 64;
300
301 }
302 1896470 return val;
303 }
304
305
306 /* Decode RVLC of H.263+ UMV */
307 103298 static int h263p_decode_umotion(MpegEncContext * s, int pred)
308 {
309 103298 int code = 0, sign;
310
311
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 103298 if (get_bits1(&s->gb)) /* Motion difference = 0 */
312 51255 return pred;
313
314 52043 code = 2 + get_bits1(&s->gb);
315
316
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 80802 while (get_bits1(&s->gb))
317 {
318 28759 code <<= 1;
319 28759 code += get_bits1(&s->gb);
320
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 28759 if (code >= 32768) {
321 ✗ avpriv_request_sample(s->avctx, "Huge DMV");
322 ✗ return 0xffff;
323 }
324 }
325 52043 sign = code & 1;
326 52043 code >>= 1;
327
328
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 52043 code = (sign) ? (pred - code) : (pred + code);
329 ff_tlog(s->avctx,"H.263+ UMV Motion = %d\n", code);
330 52043 return code;
331
332 }
333
334 /**
335 * read the next MVs for OBMC. yes this is an ugly hack, feel free to send a patch :)
336 */
337 48550 static void preview_obmc(MpegEncContext *s){
338 48550 GetBitContext gb= s->gb;
339
340 int cbpc, i, pred_x, pred_y, mx, my;
341 int16_t *mot_val;
342 48550 const int xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
343 48550 const int stride= s->b8_stride*2;
344
345
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 242750 for(i=0; i<4; i++)
346 194200 s->block_index[i]+= 2;
347
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 145650 for(i=4; i<6; i++)
348 97100 s->block_index[i]+= 1;
349 48550 s->mb_x++;
350
351 av_assert2(s->pict_type == AV_PICTURE_TYPE_P);
352
353 do{
354
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 48550 if (get_bits1(&s->gb)) {
355 /* skip mb */
356 654 mot_val = s->current_picture.motion_val[0][s->block_index[0]];
357 654 mot_val[0 ]= mot_val[2 ]=
358 654 mot_val[0+stride]= mot_val[2+stride]= 0;
359 654 mot_val[1 ]= mot_val[3 ]=
360 654 mot_val[1+stride]= mot_val[3+stride]= 0;
361
362 654 s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
363 654 goto end;
364 }
365 47896 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
366
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 47896 }while(cbpc == 20);
367
368
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 47896 if(cbpc & 4){
369 957 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
370 }else{
371 46939 get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
372
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 46939 if (cbpc & 8) {
373 ✗ if(s->modified_quant){
374 ✗ if(get_bits1(&s->gb)) skip_bits(&s->gb, 1);
375 ✗ else skip_bits(&s->gb, 5);
376 }else
377 ✗ skip_bits(&s->gb, 2);
378 }
379
380
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 46939 if ((cbpc & 16) == 0) {
381 46939 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
382 /* 16x16 motion prediction */
383 46939 mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
384
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 46939 if (s->umvplus)
385 ✗ mx = h263p_decode_umotion(s, pred_x);
386 else
387 46939 mx = ff_h263_decode_motion(s, pred_x, 1);
388
389
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 46939 if (s->umvplus)
390 ✗ my = h263p_decode_umotion(s, pred_y);
391 else
392 46939 my = ff_h263_decode_motion(s, pred_y, 1);
393
394 46939 mot_val[0 ]= mot_val[2 ]=
395 46939 mot_val[0+stride]= mot_val[2+stride]= mx;
396 46939 mot_val[1 ]= mot_val[3 ]=
397 46939 mot_val[1+stride]= mot_val[3+stride]= my;
398 } else {
399 ✗ s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
400 ✗ for(i=0;i<4;i++) {
401 ✗ mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
402 ✗ if (s->umvplus)
403 ✗ mx = h263p_decode_umotion(s, pred_x);
404 else
405 ✗ mx = ff_h263_decode_motion(s, pred_x, 1);
406
407 ✗ if (s->umvplus)
408 ✗ my = h263p_decode_umotion(s, pred_y);
409 else
410 ✗ my = ff_h263_decode_motion(s, pred_y, 1);
411 ✗ if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
412 ✗ skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
413 ✗ mot_val[0] = mx;
414 ✗ mot_val[1] = my;
415 }
416 }
417 }
418 ✗ end:
419
420
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 242750 for(i=0; i<4; i++)
421 194200 s->block_index[i]-= 2;
422
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 145650 for(i=4; i<6; i++)
423 97100 s->block_index[i]-= 1;
424 48550 s->mb_x--;
425
426 48550 s->gb= gb;
427 48550 }
428
429 ✗ static void h263_decode_dquant(MpegEncContext *s){
430 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
431
432 ✗ if(s->modified_quant){
433 ✗ if(get_bits1(&s->gb))
434 ✗ s->qscale= ff_modified_quant_tab[get_bits1(&s->gb)][ s->qscale ];
435 else
436 ✗ s->qscale= get_bits(&s->gb, 5);
437 }else
438 ✗ s->qscale += quant_tab[get_bits(&s->gb, 2)];
439 ✗ ff_set_qscale(s, s->qscale);
440 }
441
442 2590998 static int h263_decode_block(MpegEncContext * s, int16_t * block,
443 int n, int coded)
444 {
445 int level, i, j, run;
446 2590998 RLTable *rl = &ff_h263_rl_inter;
447 const uint8_t *scan_table;
448 2590998 GetBitContext gb= s->gb;
449
450 2590998 scan_table = s->intra_scantable.permutated;
451
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 2590998 if (s->h263_aic && s->mb_intra) {
452 91098 rl = &ff_rl_intra_aic;
453 91098 i = 0;
454
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 91098 if (s->ac_pred) {
455
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 4434 if (s->h263_aic_dir)
456 1596 scan_table = s->intra_v_scantable.permutated; /* left */
457 else
458 2838 scan_table = s->intra_h_scantable.permutated; /* top */
459 }
460
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 2499900 } else if (s->mb_intra) {
461 /* DC coef */
462
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 300744 if (CONFIG_RV10_DECODER && s->codec_id == AV_CODEC_ID_RV10) {
463
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 46710 if (s->rv10_version == 3 && s->pict_type == AV_PICTURE_TYPE_I) {
464 int component, diff;
465 ✗ component = (n <= 3 ? 0 : n - 4 + 1);
466 ✗ level = s->last_dc[component];
467 ✗ if (s->rv10_first_dc_coded[component]) {
468 ✗ diff = ff_rv_decode_dc(s, n);
469 ✗ if (diff < 0)
470 ✗ return -1;
471 ✗ level += diff;
472 ✗ level = level & 0xff; /* handle wrap round */
473 ✗ s->last_dc[component] = level;
474 } else {
475 ✗ s->rv10_first_dc_coded[component] = 1;
476 }
477 } else {
478 46710 level = get_bits(&s->gb, 8);
479
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 46710 if (level == 255)
480 542 level = 128;
481 }
482 }else{
483 254034 level = get_bits(&s->gb, 8);
484
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 254034 if((level&0x7F) == 0){
485 ✗ av_log(s->avctx, AV_LOG_ERROR, "illegal dc %d at %d %d\n", level, s->mb_x, s->mb_y);
486 ✗ if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT))
487 ✗ return -1;
488 }
489
2/2
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 254034 if (level == 255)
490 3049 level = 128;
491 }
492 300744 block[0] = level;
493 300744 i = 1;
494 } else {
495 2199156 i = 0;
496 }
497
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 2590998 if (!coded) {
498
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 1245242 if (s->mb_intra && s->h263_aic)
499 3823 goto not_coded;
500 1241419 s->block_last_index[n] = i - 1;
501 1241419 return 0;
502 }
503 1345756 retry:
504 {
505 1412215 OPEN_READER(re, &s->gb);
506 1412215 i--; // offset by -1 to allow direct indexing of scan_table
507 for(;;) {
508 14050943 UPDATE_CACHE(re, &s->gb);
509
2/2
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 14050943 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
510
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 14050943 if (run == 66) {
511
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 587695 if (level){
512 ✗ CLOSE_READER(re, &s->gb);
513 ✗ av_log(s->avctx, AV_LOG_ERROR, "illegal ac vlc code at %dx%d\n", s->mb_x, s->mb_y);
514 ✗ return -1;
515 }
516 /* escape */
517
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 587695 if (CONFIG_FLV_DECODER && s->h263_flv > 1) {
518 117640 int is11 = SHOW_UBITS(re, &s->gb, 1);
519 117640 SKIP_CACHE(re, &s->gb, 1);
520 117640 run = SHOW_UBITS(re, &s->gb, 7) + 1;
521
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 117640 if (is11) {
522 ✗ SKIP_COUNTER(re, &s->gb, 1 + 7);
523 ✗ UPDATE_CACHE(re, &s->gb);
524 ✗ level = SHOW_SBITS(re, &s->gb, 11);
525 ✗ SKIP_COUNTER(re, &s->gb, 11);
526 } else {
527 117640 SKIP_CACHE(re, &s->gb, 7);
528 117640 level = SHOW_SBITS(re, &s->gb, 7);
529 117640 SKIP_COUNTER(re, &s->gb, 1 + 7 + 7);
530 }
531 } else {
532 470055 run = SHOW_UBITS(re, &s->gb, 7) + 1;
533 470055 SKIP_CACHE(re, &s->gb, 7);
534 470055 level = (int8_t)SHOW_UBITS(re, &s->gb, 8);
535 470055 SKIP_COUNTER(re, &s->gb, 7 + 8);
536
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 470055 if(level == -128){
537 3157 UPDATE_CACHE(re, &s->gb);
538
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 3157 if (s->codec_id == AV_CODEC_ID_RV10) {
539 /* XXX: should patch encoder too */
540 ✗ level = SHOW_SBITS(re, &s->gb, 12);
541 ✗ SKIP_COUNTER(re, &s->gb, 12);
542 }else{
543 3157 level = SHOW_UBITS(re, &s->gb, 5);
544 3157 SKIP_CACHE(re, &s->gb, 5);
545 3157 level |= SHOW_SBITS(re, &s->gb, 6) * (1<<5);
546 3157 SKIP_COUNTER(re, &s->gb, 5 + 6);
547 }
548 }
549 }
550 } else {
551
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 13463248 if (SHOW_UBITS(re, &s->gb, 1))
552 6708475 level = -level;
553 13463248 SKIP_COUNTER(re, &s->gb, 1);
554 }
555 14050943 i += run;
556
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 14050943 if (i >= 64){
557 1412215 CLOSE_READER(re, &s->gb);
558 // redo update without last flag, revert -1 offset
559 1412215 i = i - run + ((run-1)&63) + 1;
560
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✓ Branch 1 taken 66459 times.
 1412215 if (i < 64) {
561 // only last marker, no overrun
562 1345756 block[scan_table[i]] = level;
563 1345756 break;
564 }
565
3/6
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 66459 if(s->alt_inter_vlc && rl == &ff_h263_rl_inter && !s->mb_intra){
566 //Looks like a hack but no, it's the way it is supposed to work ...
567 66459 rl = &ff_rl_intra_aic;
568 66459 i = 0;
569 66459 s->gb= gb;
570 66459 s->bdsp.clear_block(block);
571 66459 goto retry;
572 }
573 ✗ av_log(s->avctx, AV_LOG_ERROR, "run overflow at %dx%d i:%d\n", s->mb_x, s->mb_y, s->mb_intra);
574 ✗ return -1;
575 }
576 12638728 j = scan_table[i];
577 12638728 block[j] = level;
578 }
579 }
580 1349579 not_coded:
581
4/4
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 1349579 if (s->mb_intra && s->h263_aic) {
582 91098 ff_h263_pred_acdc(s, block, n);
583 91098 i = 63;
584 }
585 1349579 s->block_last_index[n] = i;
586 1349579 return 0;
587 }
588
589 ✗ static int h263_skip_b_part(MpegEncContext *s, int cbp)
590 {
591 ✗ LOCAL_ALIGNED_32(int16_t, dblock, [64]);
592 int i, mbi;
593 int bli[6];
594
595 /* we have to set s->mb_intra to zero to decode B-part of PB-frame correctly
596 * but real value should be restored in order to be used later (in OBMC condition)
597 */
598 ✗ mbi = s->mb_intra;
599 ✗ memcpy(bli, s->block_last_index, sizeof(bli));
600 ✗ s->mb_intra = 0;
601 ✗ for (i = 0; i < 6; i++) {
602 ✗ if (h263_decode_block(s, dblock, i, cbp&32) < 0)
603 ✗ return -1;
604 ✗ cbp+=cbp;
605 }
606 ✗ s->mb_intra = mbi;
607 ✗ memcpy(s->block_last_index, bli, sizeof(bli));
608 ✗ return 0;
609 }
610
611 ✗ static int h263_get_modb(GetBitContext *gb, int pb_frame, int *cbpb)
612 {
613 ✗ int c, mv = 1;
614
615 ✗ if (pb_frame < 3) { // h.263 Annex G and i263 PB-frame
616 ✗ c = get_bits1(gb);
617 ✗ if (pb_frame == 2 && c)
618 ✗ mv = !get_bits1(gb);
619 } else { // h.263 Annex M improved PB-frame
620 ✗ mv = get_unary(gb, 0, 4) + 1;
621 ✗ c = mv & 1;
622 ✗ mv = !!(mv & 2);
623 }
624 ✗ if(c)
625 ✗ *cbpb = get_bits(gb, 6);
626 ✗ return mv;
627 }
628
629 #define tab_size ((signed)FF_ARRAY_ELEMS(s->direct_scale_mv[0]))
630 #define tab_bias (tab_size / 2)
631 15407 static inline void set_one_direct_mv(MpegEncContext *s, Picture *p, int i)
632 {
633 15407 int xy = s->block_index[i];
634 15407 uint16_t time_pp = s->pp_time;
635 15407 uint16_t time_pb = s->pb_time;
636 int p_mx, p_my;
637
638 15407 p_mx = p->motion_val[0][xy][0];
639
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 15407 if ((unsigned)(p_mx + tab_bias) < tab_size) {
640 15407 s->mv[0][i][0] = s->direct_scale_mv[0][p_mx + tab_bias];
641 15407 s->mv[1][i][0] = s->direct_scale_mv[1][p_mx + tab_bias];
642 } else {
643 ✗ s->mv[0][i][0] = p_mx * time_pb / time_pp;
644 ✗ s->mv[1][i][0] = p_mx * (time_pb - time_pp) / time_pp;
645 }
646 15407 p_my = p->motion_val[0][xy][1];
647
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 15407 if ((unsigned)(p_my + tab_bias) < tab_size) {
648 15407 s->mv[0][i][1] = s->direct_scale_mv[0][p_my + tab_bias];
649 15407 s->mv[1][i][1] = s->direct_scale_mv[1][p_my + tab_bias];
650 } else {
651 ✗ s->mv[0][i][1] = p_my * time_pb / time_pp;
652 ✗ s->mv[1][i][1] = p_my * (time_pb - time_pp) / time_pp;
653 }
654 15407 }
655
656 /**
657 * @return the mb_type
658 */
659 15266 static int set_direct_mv(MpegEncContext *s)
660 {
661 15266 const int mb_index = s->mb_x + s->mb_y * s->mb_stride;
662 15266 Picture *p = &s->next_picture;
663 15266 int colocated_mb_type = p->mb_type[mb_index];
664 int i;
665
666
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 15266 if (s->codec_tag == AV_RL32("U263") && p->f->pict_type == AV_PICTURE_TYPE_I) {
667 ✗ p = &s->last_picture;
668 ✗ colocated_mb_type = p->mb_type[mb_index];
669 }
670
671
2/2
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 15266 if (IS_8X8(colocated_mb_type)) {
672 47 s->mv_type = MV_TYPE_8X8;
673
2/2
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 235 for (i = 0; i < 4; i++)
674 188 set_one_direct_mv(s, p, i);
675 47 return MB_TYPE_DIRECT2 | MB_TYPE_8x8 | MB_TYPE_L0L1;
676 } else {
677 15219 set_one_direct_mv(s, p, 0);
678 15219 s->mv[0][1][0] =
679 15219 s->mv[0][2][0] =
680 15219 s->mv[0][3][0] = s->mv[0][0][0];
681 15219 s->mv[0][1][1] =
682 15219 s->mv[0][2][1] =
683 15219 s->mv[0][3][1] = s->mv[0][0][1];
684 15219 s->mv[1][1][0] =
685 15219 s->mv[1][2][0] =
686 15219 s->mv[1][3][0] = s->mv[1][0][0];
687 15219 s->mv[1][1][1] =
688 15219 s->mv[1][2][1] =
689 15219 s->mv[1][3][1] = s->mv[1][0][1];
690 15219 s->mv_type = MV_TYPE_8X8;
691 // Note see prev line
692 15219 return MB_TYPE_DIRECT2 | MB_TYPE_16x16 | MB_TYPE_L0L1;
693 }
694 }
695
696 441138 int ff_h263_decode_mb(MpegEncContext *s,
697 int16_t block[6][64])
698 {
699 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
700 int16_t *mot_val;
701 441138 const int xy= s->mb_x + s->mb_y * s->mb_stride;
702 441138 int cbpb = 0, pb_mv_count = 0;
703
704 av_assert2(!s->h263_pred);
705
706
2/2
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✓ Branch 1 taken 73437 times.
 441138 if (s->pict_type == AV_PICTURE_TYPE_P) {
707 do{
708
2/2
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✓ Branch 2 taken 358396 times.
 367701 if (get_bits1(&s->gb)) {
709 /* skip mb */
710 9305 s->mb_intra = 0;
711
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 65135 for(i=0;i<6;i++)
712 55830 s->block_last_index[i] = -1;
713 9305 s->mv_dir = MV_DIR_FORWARD;
714 9305 s->mv_type = MV_TYPE_16X16;
715 9305 s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
716 9305 s->mv[0][0][0] = 0;
717 9305 s->mv[0][0][1] = 0;
718 9305 s->mb_skipped = !(s->obmc | s->loop_filter);
719 9305 goto end;
720 }
721 358396 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
722
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 358396 times.
 358396 if (cbpc < 0){
723 ✗ av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
724 ✗ return SLICE_ERROR;
725 }
726
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 358396 times.
 358396 }while(cbpc == 20);
727
728 358396 s->bdsp.clear_blocks(s->block[0]);
729
730 358396 dquant = cbpc & 8;
731 358396 s->mb_intra = ((cbpc & 4) != 0);
732
2/2
✓ Branch 0 taken 13424 times.
✓ Branch 1 taken 344972 times.
 358396 if (s->mb_intra) goto intra;
733
734
1/4
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✗ Branch 3 not taken.
✗ Branch 4 not taken.
 344972 if(s->pb_frame && get_bits1(&s->gb))
735 ✗ pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
736 344972 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
737
738
1/2
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✓ Branch 1 taken 344972 times.
 344972 if (cbpy < 0) {
739 ✗ av_log(s->avctx, AV_LOG_ERROR, "cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
740 ✗ return SLICE_ERROR;
741 }
742
743
4/4
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✓ Branch 3 taken 37844 times.
 344972 if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
744 307128 cbpy ^= 0xF;
745
746 344972 cbp = (cbpc & 3) | (cbpy << 2);
747
1/2
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 344972 if (dquant) {
748 ✗ h263_decode_dquant(s);
749 }
750
751 344972 s->mv_dir = MV_DIR_FORWARD;
752
2/2
✓ Branch 0 taken 343929 times.
✓ Branch 1 taken 1043 times.
 344972 if ((cbpc & 16) == 0) {
753 343929 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
754 /* 16x16 motion prediction */
755 343929 s->mv_type = MV_TYPE_16X16;
756 343929 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
757
2/2
✓ Branch 0 taken 51649 times.
✓ Branch 1 taken 292280 times.
 343929 if (s->umvplus)
758 51649 mx = h263p_decode_umotion(s, pred_x);
759 else
760 292280 mx = ff_h263_decode_motion(s, pred_x, 1);
761
762
1/2
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✓ Branch 1 taken 343929 times.
 343929 if (mx >= 0xffff)
763 ✗ return SLICE_ERROR;
764
765
2/2
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 343929 if (s->umvplus)
766 51649 my = h263p_decode_umotion(s, pred_y);
767 else
768 292280 my = ff_h263_decode_motion(s, pred_y, 1);
769
770
1/2
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✓ Branch 1 taken 343929 times.
 343929 if (my >= 0xffff)
771 ✗ return SLICE_ERROR;
772 343929 s->mv[0][0][0] = mx;
773 343929 s->mv[0][0][1] = my;
774
775
6/6
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✓ Branch 4 taken 340 times.
✓ Branch 5 taken 9791 times.
 343929 if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
776 340 skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
777 } else {
778 1043 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
779 1043 s->mv_type = MV_TYPE_8X8;
780
2/2
✓ Branch 0 taken 4172 times.
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 5215 for(i=0;i<4;i++) {
781 4172 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
782
1/2
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✓ Branch 1 taken 4172 times.
 4172 if (s->umvplus)
783 ✗ mx = h263p_decode_umotion(s, pred_x);
784 else
785 4172 mx = ff_h263_decode_motion(s, pred_x, 1);
786
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 4172 if (mx >= 0xffff)
787 ✗ return SLICE_ERROR;
788
789
1/2
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 4172 if (s->umvplus)
790 ✗ my = h263p_decode_umotion(s, pred_y);
791 else
792 4172 my = ff_h263_decode_motion(s, pred_y, 1);
793
1/2
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 4172 if (my >= 0xffff)
794 ✗ return SLICE_ERROR;
795 4172 s->mv[0][i][0] = mx;
796 4172 s->mv[0][i][1] = my;
797
1/6
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 4172 if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
798 ✗ skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
799 4172 mot_val[0] = mx;
800 4172 mot_val[1] = my;
801 }
802 }
803
2/2
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 73437 } else if(s->pict_type==AV_PICTURE_TYPE_B) {
804 int mb_type;
805 21600 const int stride= s->b8_stride;
806 21600 int16_t *mot_val0 = s->current_picture.motion_val[0][2 * (s->mb_x + s->mb_y * stride)];
807 21600 int16_t *mot_val1 = s->current_picture.motion_val[1][2 * (s->mb_x + s->mb_y * stride)];
808 // const int mv_xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
809
810 //FIXME ugly
811 21600 mot_val0[0 ]= mot_val0[2 ]= mot_val0[0+2*stride]= mot_val0[2+2*stride]=
812 21600 mot_val0[1 ]= mot_val0[3 ]= mot_val0[1+2*stride]= mot_val0[3+2*stride]=
813 21600 mot_val1[0 ]= mot_val1[2 ]= mot_val1[0+2*stride]= mot_val1[2+2*stride]=
814 21600 mot_val1[1 ]= mot_val1[3 ]= mot_val1[1+2*stride]= mot_val1[3+2*stride]= 0;
815
816 do{
817 21600 mb_type= get_vlc2(&s->gb, h263_mbtype_b_vlc.table, H263_MBTYPE_B_VLC_BITS, 2);
818
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 21600 if (mb_type < 0){
819 ✗ av_log(s->avctx, AV_LOG_ERROR, "b mb_type damaged at %d %d\n", s->mb_x, s->mb_y);
820 ✗ return SLICE_ERROR;
821 }
822
823 21600 mb_type= h263_mb_type_b_map[ mb_type ];
824
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 21600 }while(!mb_type);
825
826 21600 s->mb_intra = IS_INTRA(mb_type);
827
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 21600 if(HAS_CBP(mb_type)){
828 11402 s->bdsp.clear_blocks(s->block[0]);
829 11402 cbpc = get_vlc2(&s->gb, cbpc_b_vlc.table, CBPC_B_VLC_BITS, 1);
830
2/2
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 11402 if(s->mb_intra){
831 46 dquant = IS_QUANT(mb_type);
832 46 goto intra;
833 }
834
835 11356 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
836
837
1/2
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✓ Branch 1 taken 11356 times.
 11356 if (cbpy < 0){
838 ✗ av_log(s->avctx, AV_LOG_ERROR, "b cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
839 ✗ return SLICE_ERROR;
840 }
841
842
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✗ Branch 2 not taken.
✗ Branch 3 not taken.
 11356 if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
843 11356 cbpy ^= 0xF;
844
845 11356 cbp = (cbpc & 3) | (cbpy << 2);
846 }else
847 10198 cbp=0;
848
849 av_assert2(!s->mb_intra);
850
851
1/2
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 21554 if(IS_QUANT(mb_type)){
852 ✗ h263_decode_dquant(s);
853 }
854
855
2/2
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✓ Branch 1 taken 6288 times.
 21554 if(IS_DIRECT(mb_type)){
856 15266 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
857 15266 mb_type |= set_direct_mv(s);
858 }else{
859 6288 s->mv_dir = 0;
860 6288 s->mv_type= MV_TYPE_16X16;
861 //FIXME UMV
862
863
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 6288 if(USES_LIST(mb_type, 0)){
864 2594 int16_t *mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
865 2594 s->mv_dir = MV_DIR_FORWARD;
866
867
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 2594 if (s->umvplus)
868 ✗ mx = h263p_decode_umotion(s, pred_x);
869 else
870 2594 mx = ff_h263_decode_motion(s, pred_x, 1);
871
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 2594 if (mx >= 0xffff)
872 ✗ return SLICE_ERROR;
873
874
1/2
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 2594 if (s->umvplus)
875 ✗ my = h263p_decode_umotion(s, pred_y);
876 else
877 2594 my = ff_h263_decode_motion(s, pred_y, 1);
878
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 2594 if (my >= 0xffff)
879 ✗ return SLICE_ERROR;
880
881
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 2594 if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
882 ✗ skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
883
884 2594 s->mv[0][0][0] = mx;
885 2594 s->mv[0][0][1] = my;
886 2594 mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
887 2594 mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
888 }
889
890
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 6288 if(USES_LIST(mb_type, 1)){
891 3694 int16_t *mot_val= ff_h263_pred_motion(s, 0, 1, &pred_x, &pred_y);
892 3694 s->mv_dir |= MV_DIR_BACKWARD;
893
894
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 3694 if (s->umvplus)
895 ✗ mx = h263p_decode_umotion(s, pred_x);
896 else
897 3694 mx = ff_h263_decode_motion(s, pred_x, 1);
898
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 3694 if (mx >= 0xffff)
899 ✗ return SLICE_ERROR;
900
901
1/2
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 3694 if (s->umvplus)
902 ✗ my = h263p_decode_umotion(s, pred_y);
903 else
904 3694 my = ff_h263_decode_motion(s, pred_y, 1);
905
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 3694 if (my >= 0xffff)
906 ✗ return SLICE_ERROR;
907
908
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 3694 if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
909 ✗ skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
910
911 3694 s->mv[1][0][0] = mx;
912 3694 s->mv[1][0][1] = my;
913 3694 mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
914 3694 mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
915 }
916 }
917
918 21554 s->current_picture.mb_type[xy] = mb_type;
919 } else { /* I-Frame */
920 do{
921 51837 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
922
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 51837 if (cbpc < 0){
923 ✗ av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
924 ✗ return SLICE_ERROR;
925 }
926
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 51837 }while(cbpc == 8);
927
928 51837 s->bdsp.clear_blocks(s->block[0]);
929
930 51837 dquant = cbpc & 4;
931 51837 s->mb_intra = 1;
932 65307 intra:
933 65307 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
934
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 65307 if (s->h263_aic) {
935 15183 s->ac_pred = get_bits1(&s->gb);
936
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 15183 if(s->ac_pred){
937 739 s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
938
939 739 s->h263_aic_dir = get_bits1(&s->gb);
940 }
941 }else
942 50124 s->ac_pred = 0;
943
944
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 65307 if(s->pb_frame && get_bits1(&s->gb))
945 ✗ pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
946 65307 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
947
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 65307 if(cbpy<0){
948 ✗ av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
949 ✗ return SLICE_ERROR;
950 }
951 65307 cbp = (cbpc & 3) | (cbpy << 2);
952
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 65307 if (dquant) {
953 ✗ h263_decode_dquant(s);
954 }
955
956 65307 pb_mv_count += !!s->pb_frame;
957 }
958
959
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 431833 while(pb_mv_count--){
960 ✗ ff_h263_decode_motion(s, 0, 1);
961 ✗ ff_h263_decode_motion(s, 0, 1);
962 }
963
964 /* decode each block */
965
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 3022831 for (i = 0; i < 6; i++) {
966
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 2590998 if (h263_decode_block(s, block[i], i, cbp&32) < 0)
967 ✗ return -1;
968 2590998 cbp+=cbp;
969 }
970
971
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 431833 if(s->pb_frame && h263_skip_b_part(s, cbpb) < 0)
972 ✗ return -1;
973
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 431833 if(s->obmc && !s->mb_intra){
974
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 50805 if(s->pict_type == AV_PICTURE_TYPE_P && s->mb_x+1<s->mb_width && s->mb_num_left != 1)
975 48550 preview_obmc(s);
976 }
977 383283 end:
978
979
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 441138 if (get_bits_left(&s->gb) < 0)
980 ✗ return AVERROR_INVALIDDATA;
981
982 /* per-MB end of slice check */
983 {
984 441138 int v= show_bits(&s->gb, 16);
985
986
2/2
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 441138 if (get_bits_left(&s->gb) < 16) {
987 1616 v >>= 16 - get_bits_left(&s->gb);
988 }
989
990
2/2
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 441138 if(v==0)
991 3742 return SLICE_END;
992 }
993
994 437396 return SLICE_OK;
995 }
996
997 /* Most is hardcoded; should extend to handle all H.263 streams. */
998 461 int ff_h263_decode_picture_header(MpegEncContext *s)
999 {
1000 int format, width, height, i, ret;
1001 uint32_t startcode;
1002
1003 461 align_get_bits(&s->gb);
1004
1005
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 461 if (show_bits(&s->gb, 2) == 2 && s->avctx->frame_number == 0) {
1006 ✗ av_log(s->avctx, AV_LOG_WARNING, "Header looks like RTP instead of H.263\n");
1007 }
1008
1009 461 startcode= get_bits(&s->gb, 22-8);
1010
1011
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 461 for(i= get_bits_left(&s->gb); i>24; i-=8) {
1012 461 startcode = ((startcode << 8) | get_bits(&s->gb, 8)) & 0x003FFFFF;
1013
1014
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 461 if(startcode == 0x20)
1015 461 break;
1016 }
1017
1018
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 461 if (startcode != 0x20) {
1019 ✗ av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
1020 ✗ return -1;
1021 }
1022 /* temporal reference */
1023 461 i = get_bits(&s->gb, 8); /* picture timestamp */
1024
1025 461 i -= (i - (s->picture_number & 0xFF) + 128) & ~0xFF;
1026
1027 461 s->picture_number= (s->picture_number&~0xFF) + i;
1028
1029 /* PTYPE starts here */
1030
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 461 if (check_marker(s->avctx, &s->gb, "in PTYPE") != 1) {
1031 ✗ return -1;
1032 }
1033
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 461 if (get_bits1(&s->gb) != 0) {
1034 ✗ av_log(s->avctx, AV_LOG_ERROR, "Bad H.263 id\n");
1035 ✗ return -1; /* H.263 id */
1036 }
1037 461 skip_bits1(&s->gb); /* split screen off */
1038 461 skip_bits1(&s->gb); /* camera off */
1039 461 skip_bits1(&s->gb); /* freeze picture release off */
1040
1041 461 format = get_bits(&s->gb, 3);
1042 /*
1043 0 forbidden
1044 1 sub-QCIF
1045 10 QCIF
1046 7 extended PTYPE (PLUSPTYPE)
1047 */
1048
1049
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 461 if (format != 7 && format != 6) {
1050 307 s->h263_plus = 0;
1051 /* H.263v1 */
1052 307 width = ff_h263_format[format][0];
1053 307 height = ff_h263_format[format][1];
1054
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 307 if (!width)
1055 ✗ return -1;
1056
1057 307 s->pict_type = AV_PICTURE_TYPE_I + get_bits1(&s->gb);
1058
1059 307 s->h263_long_vectors = get_bits1(&s->gb);
1060
1061
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 307 if (get_bits1(&s->gb) != 0) {
1062 ✗ av_log(s->avctx, AV_LOG_ERROR, "H.263 SAC not supported\n");
1063 ✗ return -1; /* SAC: off */
1064 }
1065 307 s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
1066
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 307 s->unrestricted_mv = s->h263_long_vectors || s->obmc;
1067
1068 307 s->pb_frame = get_bits1(&s->gb);
1069 307 s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
1070 307 skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
1071
1072 307 s->width = width;
1073 307 s->height = height;
1074 307 s->avctx->sample_aspect_ratio= (AVRational){12,11};
1075 307 s->avctx->framerate = (AVRational){ 30000, 1001 };
1076 } else {
1077 int ufep;
1078
1079 /* H.263v2 */
1080 154 s->h263_plus = 1;
1081 154 ufep = get_bits(&s->gb, 3); /* Update Full Extended PTYPE */
1082
1083 /* ufep other than 0 and 1 are reserved */
1084
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 154 if (ufep == 1) {
1085 /* OPPTYPE */
1086 154 format = get_bits(&s->gb, 3);
1087 ff_dlog(s->avctx, "ufep=1, format: %d\n", format);
1088 154 s->custom_pcf= get_bits1(&s->gb);
1089 154 s->umvplus = get_bits1(&s->gb); /* Unrestricted Motion Vector */
1090
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 154 if (get_bits1(&s->gb) != 0) {
1091 ✗ av_log(s->avctx, AV_LOG_ERROR, "Syntax-based Arithmetic Coding (SAC) not supported\n");
1092 }
1093 154 s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
1094 154 s->h263_aic = get_bits1(&s->gb); /* Advanced Intra Coding (AIC) */
1095 154 s->loop_filter= get_bits1(&s->gb);
1096
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 154 s->unrestricted_mv = s->umvplus || s->obmc || s->loop_filter;
1097
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 154 if(s->avctx->lowres)
1098 ✗ s->loop_filter = 0;
1099
1100 154 s->h263_slice_structured= get_bits1(&s->gb);
1101
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 154 if (get_bits1(&s->gb) != 0) {
1102 ✗ av_log(s->avctx, AV_LOG_ERROR, "Reference Picture Selection not supported\n");
1103 }
1104
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 154 if (get_bits1(&s->gb) != 0) {
1105 ✗ av_log(s->avctx, AV_LOG_ERROR, "Independent Segment Decoding not supported\n");
1106 }
1107 154 s->alt_inter_vlc= get_bits1(&s->gb);
1108 154 s->modified_quant= get_bits1(&s->gb);
1109
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 154 if(s->modified_quant)
1110 154 s->chroma_qscale_table= ff_h263_chroma_qscale_table;
1111
1112 154 skip_bits(&s->gb, 1); /* Prevent start code emulation */
1113
1114 154 skip_bits(&s->gb, 3); /* Reserved */
1115 ✗ } else if (ufep != 0) {
1116 ✗ av_log(s->avctx, AV_LOG_ERROR, "Bad UFEP type (%d)\n", ufep);
1117 ✗ return -1;
1118 }
1119
1120 /* MPPTYPE */
1121 154 s->pict_type = get_bits(&s->gb, 3);
1122
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 154 switch(s->pict_type){
1123 19 case 0: s->pict_type= AV_PICTURE_TYPE_I;break;
1124 135 case 1: s->pict_type= AV_PICTURE_TYPE_P;break;
1125 ✗ case 2: s->pict_type= AV_PICTURE_TYPE_P;s->pb_frame = 3;break;
1126 ✗ case 3: s->pict_type= AV_PICTURE_TYPE_B;break;
1127 ✗ case 7: s->pict_type= AV_PICTURE_TYPE_I;break; //ZYGO
1128 ✗ default:
1129 ✗ return -1;
1130 }
1131 154 skip_bits(&s->gb, 2);
1132 154 s->no_rounding = get_bits1(&s->gb);
1133 154 skip_bits(&s->gb, 4);
1134
1135 /* Get the picture dimensions */
1136
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 154 if (ufep) {
1137
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 154 if (format == 6) {
1138 /* Custom Picture Format (CPFMT) */
1139 ✗ s->aspect_ratio_info = get_bits(&s->gb, 4);
1140 ff_dlog(s->avctx, "aspect: %d\n", s->aspect_ratio_info);
1141 /* aspect ratios:
1142 0 - forbidden
1143 1 - 1:1
1144 2 - 12:11 (CIF 4:3)
1145 3 - 10:11 (525-type 4:3)
1146 4 - 16:11 (CIF 16:9)
1147 5 - 40:33 (525-type 16:9)
1148 6-14 - reserved
1149 */
1150 ✗ width = (get_bits(&s->gb, 9) + 1) * 4;
1151 ✗ check_marker(s->avctx, &s->gb, "in dimensions");
1152 ✗ height = get_bits(&s->gb, 9) * 4;
1153 ff_dlog(s->avctx, "\nH.263+ Custom picture: %dx%d\n",width,height);
1154 ✗ if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
1155 /* expected dimensions */
1156 ✗ s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 8);
1157 ✗ s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 8);
1158 }else{
1159 ✗ s->avctx->sample_aspect_ratio= ff_h263_pixel_aspect[s->aspect_ratio_info];
1160 }
1161 } else {
1162 154 width = ff_h263_format[format][0];
1163 154 height = ff_h263_format[format][1];
1164 154 s->avctx->sample_aspect_ratio= (AVRational){12,11};
1165 }
1166 154 s->avctx->sample_aspect_ratio.den <<= s->ehc_mode;
1167
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 154 if ((width == 0) || (height == 0))
1168 ✗ return -1;
1169 154 s->width = width;
1170 154 s->height = height;
1171
1172
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 154 if(s->custom_pcf){
1173 int gcd;
1174 154 s->avctx->framerate.num = 1800000;
1175 154 s->avctx->framerate.den = 1000 + get_bits1(&s->gb);
1176 154 s->avctx->framerate.den *= get_bits(&s->gb, 7);
1177
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 154 if(s->avctx->framerate.den == 0){
1178 ✗ av_log(s, AV_LOG_ERROR, "zero framerate\n");
1179 ✗ return -1;
1180 }
1181 154 gcd= av_gcd(s->avctx->framerate.den, s->avctx->framerate.num);
1182 154 s->avctx->framerate.den /= gcd;
1183 154 s->avctx->framerate.num /= gcd;
1184 }else{
1185 ✗ s->avctx->framerate = (AVRational){ 30000, 1001 };
1186 }
1187 }
1188
1189
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 154 if(s->custom_pcf){
1190 154 skip_bits(&s->gb, 2); //extended Temporal reference
1191 }
1192
1193
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 154 if (ufep) {
1194
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 154 if (s->umvplus) {
1195
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 154 if(get_bits1(&s->gb)==0) /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */
1196 154 skip_bits1(&s->gb);
1197 }
1198
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 154 if(s->h263_slice_structured){
1199 ✗ if (get_bits1(&s->gb) != 0) {
1200 ✗ av_log(s->avctx, AV_LOG_ERROR, "rectangular slices not supported\n");
1201 }
1202 ✗ if (get_bits1(&s->gb) != 0) {
1203 ✗ av_log(s->avctx, AV_LOG_ERROR, "unordered slices not supported\n");
1204 }
1205 }
1206
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 154 if (s->pict_type == AV_PICTURE_TYPE_B) {
1207 ✗ skip_bits(&s->gb, 4); //ELNUM
1208 ✗ if (ufep == 1) {
1209 ✗ skip_bits(&s->gb, 4); // RLNUM
1210 }
1211 }
1212 }
1213
1214 154 s->qscale = get_bits(&s->gb, 5);
1215 }
1216
1217
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 461 if ((ret = av_image_check_size(s->width, s->height, 0, s)) < 0)
1218 ✗ return ret;
1219
1220
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 461 if (!(s->avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
1221
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 461 if ((s->width * s->height / 256 / 8) > get_bits_left(&s->gb))
1222 ✗ return AVERROR_INVALIDDATA;
1223 }
1224
1225 461 s->mb_width = (s->width + 15) / 16;
1226 461 s->mb_height = (s->height + 15) / 16;
1227 461 s->mb_num = s->mb_width * s->mb_height;
1228
1229
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 461 if (s->pb_frame) {
1230 ✗ skip_bits(&s->gb, 3); /* Temporal reference for B-pictures */
1231 ✗ if (s->custom_pcf)
1232 ✗ skip_bits(&s->gb, 2); //extended Temporal reference
1233 ✗ skip_bits(&s->gb, 2); /* Quantization information for B-pictures */
1234 }
1235
1236
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 461 if (s->pict_type!=AV_PICTURE_TYPE_B) {
1237 461 s->time = s->picture_number;
1238 461 s->pp_time = s->time - s->last_non_b_time;
1239 461 s->last_non_b_time = s->time;
1240 }else{
1241 ✗ s->time = s->picture_number;
1242 ✗ s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
1243 ✗ if (s->pp_time <=s->pb_time ||
1244 ✗ s->pp_time <= s->pp_time - s->pb_time ||
1245 ✗ s->pp_time <= 0){
1246 ✗ s->pp_time = 2;
1247 ✗ s->pb_time = 1;
1248 }
1249 ✗ ff_mpeg4_init_direct_mv(s);
1250 }
1251
1252 /* PEI */
1253
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 461 if (skip_1stop_8data_bits(&s->gb) < 0)
1254 ✗ return AVERROR_INVALIDDATA;
1255
1256
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 461 if(s->h263_slice_structured){
1257 ✗ if (check_marker(s->avctx, &s->gb, "SEPB1") != 1) {
1258 ✗ return -1;
1259 }
1260
1261 ✗ ff_h263_decode_mba(s);
1262
1263 ✗ if (check_marker(s->avctx, &s->gb, "SEPB2") != 1) {
1264 ✗ return -1;
1265 }
1266 }
1267 461 s->f_code = 1;
1268
1269
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 461 if (s->pict_type == AV_PICTURE_TYPE_B)
1270 ✗ s->low_delay = 0;
1271
1272
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 461 if(s->h263_aic){
1273 154 s->y_dc_scale_table=
1274 154 s->c_dc_scale_table= ff_aic_dc_scale_table;
1275 }else{
1276 307 s->y_dc_scale_table=
1277 307 s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
1278 }
1279
1280 461 ff_h263_show_pict_info(s);
1281
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 461 if (s->pict_type == AV_PICTURE_TYPE_I && s->codec_tag == AV_RL32("ZYGO") && get_bits_left(&s->gb) >= 85 + 13*3*16 + 50){
1282 int i,j;
1283 ✗ for(i=0; i<85; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
1284 ✗ av_log(s->avctx, AV_LOG_DEBUG, "\n");
1285 ✗ for(i=0; i<13; i++){
1286 ✗ for(j=0; j<3; j++){
1287 ✗ int v= get_bits(&s->gb, 8);
1288 ✗ v |= get_sbits(&s->gb, 8) * (1 << 8);
1289 ✗ av_log(s->avctx, AV_LOG_DEBUG, " %5d", v);
1290 }
1291 ✗ av_log(s->avctx, AV_LOG_DEBUG, "\n");
1292 }
1293 ✗ for(i=0; i<50; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
1294 }
1295
1296 461 return 0;
1297 }
1298