66 |
#define ABS(X) (((X)>0)?(X):-(X)) |
#define ABS(X) (((X)>0)?(X):-(X)) |
67 |
#define CLIP(X,A) (X > A) ? (A) : (X) |
#define CLIP(X,A) (X > A) ? (A) : (X) |
68 |
|
|
69 |
|
/* #define BIGLUT */ |
70 |
|
|
71 |
|
#ifdef BIGLUT |
72 |
|
#define LEVELOFFSET 2048 |
73 |
|
#else |
74 |
|
#define LEVELOFFSET 32 |
75 |
|
#endif |
76 |
|
|
77 |
/***************************************************************************** |
/***************************************************************************** |
78 |
* Local data |
* Local data |
79 |
****************************************************************************/ |
****************************************************************************/ |
80 |
|
|
81 |
/* msvc sp5+pp gets confused if they globals are made static */ |
static REVERSE_EVENT DCT3D[2][4096]; |
|
static VLC intra_table[524288]; |
|
|
static VLC inter_table[524288]; |
|
82 |
|
|
83 |
static VLC DCT3Dintra[4096]; |
#ifdef BIGLUT |
84 |
static VLC DCT3Dinter[4096]; |
static VLC coeff_VLC[2][2][4096][64]; |
85 |
|
static VLC *intra_table, *inter_table; |
86 |
|
#else |
87 |
|
static VLC coeff_VLC[2][2][64][64]; |
88 |
|
#endif |
89 |
|
|
90 |
/***************************************************************************** |
/***************************************************************************** |
91 |
* Vector Length Coding Initialization |
* Vector Length Coding Initialization |
94 |
void |
void |
95 |
init_vlc_tables(void) |
init_vlc_tables(void) |
96 |
{ |
{ |
97 |
|
ptr_t i, j, intra, last, run, run_esc, level, level_esc, escape, escape_len, offset; |
98 |
|
|
99 |
int32_t k, l, i, intra, last; |
#ifdef BIGLUT |
100 |
VLC *vlc[2]; |
intra_table = (VLC*)coeff_VLC[1]; |
101 |
VLC const **coeff_ptr; |
inter_table = (VLC*)coeff_VLC[0]; |
102 |
VLC *vlc1, *vlc2; |
#endif |
|
|
|
|
vlc1 = DCT3Dintra; |
|
|
vlc2 = DCT3Dinter; |
|
|
|
|
|
vlc[0] = intra_table; |
|
|
vlc[1] = inter_table; |
|
|
|
|
|
/* |
|
|
* Generate encoding vlc lookup tables |
|
|
* the lookup table idea is taken from the excellent fame project |
|
|
* by Vivien Chapellier |
|
|
*/ |
|
|
for (i = 0; i < 4; i++) { |
|
|
intra = i % 2; |
|
|
last = i / 2; |
|
|
|
|
|
coeff_ptr = coeff_vlc[last + 2 * intra]; |
|
|
|
|
|
for (k = -2047; k < 2048; k++) { /* level */ |
|
|
int8_t const *max_level_ptr = max_level[last + 2 * intra]; |
|
|
int8_t const *max_run_ptr = max_run[last + 2 * intra]; |
|
103 |
|
|
|
for (l = 0; l < 64; l++) { /* run */ |
|
|
int32_t level = k; |
|
|
ptr_t run = l; |
|
104 |
|
|
105 |
if ((abs(level) <= max_level_ptr[run]) && (run <= (uint32_t) max_run_ptr[abs(level)])) { /* level < max_level and run < max_run */ |
for (intra = 0; intra < 2; intra++) |
106 |
|
for (i = 0; i < 4096; i++) |
107 |
|
DCT3D[intra][i].event.level = 0; |
108 |
|
|
109 |
vlc[intra]->code = 0; |
for (intra = 0; intra < 2; intra++) |
110 |
vlc[intra]->len = 0; |
for (last = 0; last < 2; last++) |
111 |
goto loop_end; |
{ |
112 |
} else { |
for (run = 0; run < 63 + last; run++) |
113 |
if (level > 0) /* correct level */ |
for (level = 0; level < 32 << intra; level++) |
114 |
level -= max_level_ptr[run]; |
{ |
115 |
else |
#ifdef BIGLUT |
116 |
level += max_level_ptr[run]; |
offset = LEVELOFFSET; |
117 |
|
#else |
118 |
if ((abs(level) <= max_level_ptr[run]) && |
offset = !intra * LEVELOFFSET; |
119 |
(run <= (uint32_t) max_run_ptr[abs(level)])) { |
#endif |
120 |
|
coeff_VLC[intra][last][level + offset][run].len = 128; |
121 |
vlc[intra]->code = 0x06; |
} |
|
vlc[intra]->len = 8; |
|
|
goto loop_end; |
|
122 |
} |
} |
123 |
|
|
124 |
if (level > 0) /* still here? */ |
for (intra = 0; intra < 2; intra++) |
125 |
level += max_level_ptr[run]; /* restore level */ |
for (i = 0; i < 102; i++) |
126 |
else |
{ |
127 |
level -= max_level_ptr[run]; |
#ifdef BIGLUT |
128 |
|
offset = LEVELOFFSET; |
129 |
run -= max_run_ptr[abs(level)] + 1; /* and change run */ |
#else |
130 |
|
offset = !intra * LEVELOFFSET; |
131 |
if ((abs(level) <= max_level_ptr[run]) && |
#endif |
132 |
(run <= (uint32_t) max_run_ptr[abs(level)])) { |
for (j = 0; j < 1 << (12 - coeff_tab[intra][i].vlc.len); j++) |
133 |
|
{ |
134 |
|
DCT3D[intra][(coeff_tab[intra][i].vlc.code << (12 - coeff_tab[intra][i].vlc.len)) | j].len = coeff_tab[intra][i].vlc.len; |
135 |
|
DCT3D[intra][(coeff_tab[intra][i].vlc.code << (12 - coeff_tab[intra][i].vlc.len)) | j].event = coeff_tab[intra][i].event; |
136 |
|
} |
137 |
|
|
138 |
vlc[intra]->code = 0x0e; |
coeff_VLC[intra][coeff_tab[intra][i].event.last][coeff_tab[intra][i].event.level + offset][coeff_tab[intra][i].event.run].code |
139 |
vlc[intra]->len = 9; |
= coeff_tab[intra][i].vlc.code << 1; |
140 |
goto loop_end; |
coeff_VLC[intra][coeff_tab[intra][i].event.last][coeff_tab[intra][i].event.level + offset][coeff_tab[intra][i].event.run].len |
141 |
|
= coeff_tab[intra][i].vlc.len + 1; |
142 |
|
#ifndef BIGLUT |
143 |
|
if (!intra) |
144 |
|
#endif |
145 |
|
{ |
146 |
|
coeff_VLC[intra][coeff_tab[intra][i].event.last][offset - coeff_tab[intra][i].event.level][coeff_tab[intra][i].event.run].code |
147 |
|
= (coeff_tab[intra][i].vlc.code << 1) | 1; |
148 |
|
coeff_VLC[intra][coeff_tab[intra][i].event.last][offset - coeff_tab[intra][i].event.level][coeff_tab[intra][i].event.run].len |
149 |
|
= coeff_tab[intra][i].vlc.len + 1; |
150 |
} |
} |
|
run += max_run_ptr[abs(level)] + 1; |
|
151 |
} |
} |
152 |
|
|
153 |
vlc[intra]->code = |
for (intra = 0; intra < 2; intra++) |
154 |
(uint32_t) ((l << 14) | (0x1e + last) << 20) | (1 << 13) | |
for (last = 0; last < 2; last++) |
155 |
((k & 0xfff) << 1) | 1; |
for (run = 0; run < 63 + last; run++) |
156 |
|
{ |
157 |
vlc[intra]->len = 30; |
for (level = 1; level < 32 << intra; level++) |
158 |
vlc[intra]++; |
{ |
159 |
|
if (level <= max_level[intra][last][run] && run <= max_run[intra][last][level]) |
160 |
continue; |
continue; |
161 |
|
|
162 |
loop_end: |
#ifdef BIGLUT |
163 |
if (level != 0) { |
offset = LEVELOFFSET; |
164 |
vlc[intra]->code = |
#else |
165 |
(vlc[intra]-> |
offset = !intra * LEVELOFFSET; |
166 |
code << (coeff_ptr[run][abs(level) - 1].len + |
#endif |
167 |
1)) | (coeff_ptr[run][abs(level) - |
level_esc = level - max_level[intra][last][run]; |
168 |
1].code << 1); |
run_esc = run - 1 - max_run[intra][last][level]; |
169 |
vlc[intra]->len = |
/*use this test to use shorter esc2 codes when possible |
170 |
(coeff_ptr[run][abs(level) - 1].len + 1) + |
if (level_esc <= max_level[intra][last][run] && run <= max_run[intra][last][level_esc] |
171 |
vlc[intra]->len; |
&& !(coeff_VLC[intra][last][level_esc + offset][run].len + 7 + 1 |
172 |
|
> coeff_VLC[intra][last][level + offset][run_esc].code + 7 + 2))*/ |
173 |
if (level < 0) |
|
174 |
vlc[intra]->code += 1; |
if (level_esc <= max_level[intra][last][run] && run <= max_run[intra][last][level_esc]) |
175 |
} |
{ |
176 |
|
escape = ESCAPE1; |
177 |
vlc[intra]++; |
escape_len = 7 + 1; |
178 |
|
run_esc = run; |
179 |
} |
} |
180 |
|
else |
181 |
|
{ |
182 |
|
if (level <= max_level[intra][last][run_esc] && run_esc <= max_run[intra][last][level]) |
183 |
|
{ |
184 |
|
escape = ESCAPE2; |
185 |
|
escape_len = 7 + 2; |
186 |
|
level_esc = level; |
187 |
|
} |
188 |
|
else |
189 |
|
{ |
190 |
|
#ifndef BIGLUT |
191 |
|
if (!intra) |
192 |
|
#endif |
193 |
|
{ |
194 |
|
coeff_VLC[intra][last][level + offset][run].code |
195 |
|
= (ESCAPE3 << 21) | (last << 20) | (run << 14) | (1 << 13) | ((level & 0xfff) << 1) | 1; |
196 |
|
coeff_VLC[intra][last][level + offset][run].len = 30; |
197 |
|
coeff_VLC[intra][last][offset - level][run].code |
198 |
|
= (ESCAPE3 << 21) | (last << 20) | (run << 14) | (1 << 13) | ((-level & 0xfff) << 1) | 1; |
199 |
|
coeff_VLC[intra][last][offset - level][run].len = 30; |
200 |
} |
} |
201 |
|
continue; |
202 |
} |
} |
|
|
|
|
for (i = 0; i < 4096; i++) { |
|
|
if (i >= 512) { |
|
|
*vlc1 = DCT3Dtab3[(i >> 5) - 16]; |
|
|
*vlc2 = DCT3Dtab0[(i >> 5) - 16]; |
|
|
} else if (i >= 128) { |
|
|
*vlc1 = DCT3Dtab4[(i >> 2) - 32]; |
|
|
*vlc2 = DCT3Dtab1[(i >> 2) - 32]; |
|
|
} else if (i >= 8) { |
|
|
*vlc1 = DCT3Dtab5[i - 8]; |
|
|
*vlc2 = DCT3Dtab2[i - 8]; |
|
|
} else { |
|
|
*vlc1 = ERRtab[i]; |
|
|
*vlc2 = ERRtab[i]; |
|
203 |
} |
} |
204 |
|
|
205 |
vlc1++; |
coeff_VLC[intra][last][level + offset][run].code |
206 |
vlc2++; |
= (escape << coeff_VLC[intra][last][level_esc + offset][run_esc].len) |
207 |
|
| coeff_VLC[intra][last][level_esc + offset][run_esc].code; |
208 |
|
coeff_VLC[intra][last][level + offset][run].len |
209 |
|
= coeff_VLC[intra][last][level_esc + offset][run_esc].len + escape_len; |
210 |
|
#ifndef BIGLUT |
211 |
|
if (!intra) |
212 |
|
#endif |
213 |
|
{ |
214 |
|
coeff_VLC[intra][last][offset - level][run].code |
215 |
|
= (escape << coeff_VLC[intra][last][level_esc + offset][run_esc].len) |
216 |
|
| coeff_VLC[intra][last][level_esc + offset][run_esc].code | 1; |
217 |
|
coeff_VLC[intra][last][offset - level][run].len |
218 |
|
= coeff_VLC[intra][last][level_esc + offset][run_esc].len + escape_len; |
219 |
|
} |
220 |
} |
} |
|
DCT3D[0] = DCT3Dinter; |
|
|
DCT3D[1] = DCT3Dintra; |
|
221 |
|
|
222 |
|
#ifdef BIGLUT |
223 |
|
for (level = 32 << intra; level < 2048; level++) |
224 |
|
{ |
225 |
|
coeff_VLC[intra][last][level + offset][run].code |
226 |
|
= (ESCAPE3 << 21) | (last << 20) | (run << 14) | (1 << 13) | ((level & 0xfff) << 1) | 1; |
227 |
|
coeff_VLC[intra][last][level + offset][run].len = 30; |
228 |
|
|
229 |
|
coeff_VLC[intra][last][offset - level][run].code |
230 |
|
= (ESCAPE3 << 21) | (last << 20) | (run << 14) | (1 << 13) | ((-level & 0xfff) << 1) | 1; |
231 |
|
coeff_VLC[intra][last][offset - level][run].len = 30; |
232 |
|
} |
233 |
|
#else |
234 |
|
if (!intra) |
235 |
|
{ |
236 |
|
coeff_VLC[intra][last][0][run].code |
237 |
|
= (ESCAPE3 << 21) | (last << 20) | (run << 14) | (1 << 13) | ((-32 & 0xfff) << 1) | 1; |
238 |
|
coeff_VLC[intra][last][0][run].len = 30; |
239 |
|
} |
240 |
|
#endif |
241 |
|
} |
242 |
} |
} |
243 |
|
|
244 |
/***************************************************************************** |
/***************************************************************************** |
300 |
|
|
301 |
} |
} |
302 |
|
|
303 |
|
#ifdef BIGLUT |
304 |
|
|
305 |
static __inline void |
static __inline void |
306 |
CodeCoeff(Bitstream * bs, |
CodeCoeff(Bitstream * bs, |
307 |
const int16_t qcoeff[64], |
const int16_t qcoeff[64], |
321 |
j++; |
j++; |
322 |
|
|
323 |
do { |
do { |
324 |
vlc = table + 64 * 2047 + (v << 6) + j - last; |
vlc = table + 64 * 2048 + (v << 6) + j - last; |
325 |
last = ++j; |
last = ++j; |
326 |
|
|
327 |
/* count zeroes */ |
/* count zeroes */ |
332 |
if (j != 64) { |
if (j != 64) { |
333 |
BitstreamPutBits(bs, vlc->code, vlc->len); |
BitstreamPutBits(bs, vlc->code, vlc->len); |
334 |
} else { |
} else { |
335 |
vlc += 64 * 4095; |
vlc += 64 * 4096; |
336 |
BitstreamPutBits(bs, vlc->code, vlc->len); |
BitstreamPutBits(bs, vlc->code, vlc->len); |
337 |
break; |
break; |
338 |
} |
} |
340 |
|
|
341 |
} |
} |
342 |
|
|
343 |
|
#else |
344 |
|
|
345 |
|
static __inline void |
346 |
|
CodeCoeffInter(Bitstream * bs, |
347 |
|
const int16_t qcoeff[64], |
348 |
|
const uint16_t * zigzag) |
349 |
|
{ |
350 |
|
uint32_t i, run, prev_run, code, len; |
351 |
|
int32_t level, prev_level, level_shifted; |
352 |
|
|
353 |
|
i = 0; |
354 |
|
run = 0; |
355 |
|
|
356 |
|
while (!(level = qcoeff[zigzag[i++]])) |
357 |
|
run++; |
358 |
|
|
359 |
|
prev_level = level; |
360 |
|
prev_run = run; |
361 |
|
run = 0; |
362 |
|
|
363 |
|
while (i < 64) |
364 |
|
{ |
365 |
|
if ((level = qcoeff[zigzag[i++]]) != 0) |
366 |
|
{ |
367 |
|
level_shifted = prev_level + 32; |
368 |
|
if (!(level_shifted & -64)) |
369 |
|
{ |
370 |
|
code = coeff_VLC[0][0][level_shifted][prev_run].code; |
371 |
|
len = coeff_VLC[0][0][level_shifted][prev_run].len; |
372 |
|
} |
373 |
|
else |
374 |
|
{ |
375 |
|
code = (ESCAPE3 << 21) | (prev_run << 14) | (1 << 13) | ((prev_level & 0xfff) << 1) | 1; |
376 |
|
len = 30; |
377 |
|
} |
378 |
|
BitstreamPutBits(bs, code, len); |
379 |
|
prev_level = level; |
380 |
|
prev_run = run; |
381 |
|
run = 0; |
382 |
|
} |
383 |
|
else |
384 |
|
run++; |
385 |
|
} |
386 |
|
|
387 |
|
level_shifted = prev_level + 32; |
388 |
|
if (!(level_shifted & -64)) |
389 |
|
{ |
390 |
|
code = coeff_VLC[0][1][level_shifted][prev_run].code; |
391 |
|
len = coeff_VLC[0][1][level_shifted][prev_run].len; |
392 |
|
} |
393 |
|
else |
394 |
|
{ |
395 |
|
code = (ESCAPE3 << 21) | (1 << 20) | (prev_run << 14) | (1 << 13) | ((prev_level & 0xfff) << 1) | 1; |
396 |
|
len = 30; |
397 |
|
} |
398 |
|
BitstreamPutBits(bs, code, len); |
399 |
|
} |
400 |
|
|
401 |
|
static __inline void |
402 |
|
CodeCoeffIntra(Bitstream * bs, |
403 |
|
const int16_t qcoeff[64], |
404 |
|
const uint16_t * zigzag) |
405 |
|
{ |
406 |
|
uint32_t i, abs_level, run, prev_run, code, len; |
407 |
|
int32_t level, prev_level; |
408 |
|
|
409 |
|
i = 1; |
410 |
|
run = 0; |
411 |
|
|
412 |
|
while (!(level = qcoeff[zigzag[i++]])) |
413 |
|
run++; |
414 |
|
|
415 |
|
prev_level = level; |
416 |
|
prev_run = run; |
417 |
|
run = 0; |
418 |
|
|
419 |
|
while (i < 64) |
420 |
|
{ |
421 |
|
if ((level = qcoeff[zigzag[i++]]) != 0) |
422 |
|
{ |
423 |
|
abs_level = ABS(prev_level); |
424 |
|
abs_level = abs_level < 64 ? abs_level : 0; |
425 |
|
code = coeff_VLC[1][0][abs_level][prev_run].code; |
426 |
|
len = coeff_VLC[1][0][abs_level][prev_run].len; |
427 |
|
if (len != 128) |
428 |
|
code |= (prev_level < 0); |
429 |
|
else |
430 |
|
{ |
431 |
|
code = (ESCAPE3 << 21) | (prev_run << 14) | (1 << 13) | ((prev_level & 0xfff) << 1) | 1; |
432 |
|
len = 30; |
433 |
|
} |
434 |
|
BitstreamPutBits(bs, code, len); |
435 |
|
prev_level = level; |
436 |
|
prev_run = run; |
437 |
|
run = 0; |
438 |
|
} |
439 |
|
else |
440 |
|
run++; |
441 |
|
} |
442 |
|
|
443 |
|
abs_level = ABS(prev_level); |
444 |
|
abs_level = abs_level < 64 ? abs_level : 0; |
445 |
|
code = coeff_VLC[1][1][abs_level][prev_run].code; |
446 |
|
len = coeff_VLC[1][1][abs_level][prev_run].len; |
447 |
|
if (len != 128) |
448 |
|
code |= (prev_level < 0); |
449 |
|
else |
450 |
|
{ |
451 |
|
code = (ESCAPE3 << 21) | (1 << 20) | (prev_run << 14) | (1 << 13) | ((prev_level & 0xfff) << 1) | 1; |
452 |
|
len = 30; |
453 |
|
} |
454 |
|
BitstreamPutBits(bs, code, len); |
455 |
|
} |
456 |
|
|
457 |
|
#endif |
458 |
|
|
459 |
/***************************************************************************** |
/***************************************************************************** |
460 |
* Local functions |
* Local functions |
461 |
****************************************************************************/ |
****************************************************************************/ |
512 |
if (pMB->cbp & (1 << (5 - i))) { |
if (pMB->cbp & (1 << (5 - i))) { |
513 |
bits = BitstreamPos(bs); |
bits = BitstreamPos(bs); |
514 |
|
|
515 |
|
#ifdef BIGLUT |
516 |
CodeCoeff(bs, &qcoeff[i * 64], intra_table, |
CodeCoeff(bs, &qcoeff[i * 64], intra_table, |
517 |
scan_tables[pMB->acpred_directions[i]], 1); |
scan_tables[pMB->acpred_directions[i]], 1); |
518 |
|
#else |
519 |
|
CodeCoeffIntra(bs, &qcoeff[i * 64], scan_tables[pMB->acpred_directions[i]]); |
520 |
|
#endif |
521 |
bits = BitstreamPos(bs) - bits; |
bits = BitstreamPos(bs) - bits; |
522 |
pStat->iTextBits += bits; |
pStat->iTextBits += bits; |
523 |
} |
} |
581 |
/* code block coeffs */ |
/* code block coeffs */ |
582 |
for (i = 0; i < 6; i++) |
for (i = 0; i < 6; i++) |
583 |
if (pMB->cbp & (1 << (5 - i))) |
if (pMB->cbp & (1 << (5 - i))) |
584 |
|
#ifdef BIGLUT |
585 |
CodeCoeff(bs, &qcoeff[i * 64], inter_table, scan_tables[0], 0); |
CodeCoeff(bs, &qcoeff[i * 64], inter_table, scan_tables[0], 0); |
586 |
|
#else |
587 |
|
CodeCoeffInter(bs, &qcoeff[i * 64], scan_tables[0]); |
588 |
|
#endif |
589 |
|
|
590 |
bits = BitstreamPos(bs) - bits; |
bits = BitstreamPos(bs) - bits; |
591 |
pStat->iTextBits += bits; |
pStat->iTextBits += bits; |
823 |
{ |
{ |
824 |
|
|
825 |
uint32_t mode; |
uint32_t mode; |
|
const VLC *tab; |
|
826 |
int32_t level; |
int32_t level; |
827 |
|
REVERSE_EVENT *reverse_event; |
828 |
|
|
829 |
if (short_video_header) /* inter-VLCs will be used for both intra and inter blocks */ |
if (short_video_header) /* inter-VLCs will be used for both intra and inter blocks */ |
830 |
intra = 0; |
intra = 0; |
831 |
|
|
832 |
tab = &DCT3D[intra][BitstreamShowBits(bs, 12)]; |
if (BitstreamShowBits(bs, 7) != ESCAPE) { |
833 |
|
reverse_event = &DCT3D[intra][BitstreamShowBits(bs, 12)]; |
834 |
|
|
835 |
if (tab->code == -1) |
if ((level = reverse_event->event.level) == 0) |
836 |
goto error; |
goto error; |
837 |
|
|
838 |
BitstreamSkip(bs, tab->len); |
*last = reverse_event->event.last; |
839 |
|
*run = reverse_event->event.run; |
840 |
|
|
841 |
if (tab->code != ESCAPE) { |
BitstreamSkip(bs, reverse_event->len); |
842 |
if (!intra) { |
|
843 |
*run = (tab->code >> 4) & 255; |
return BitstreamGetBits(bs, 1) ? -level : level; |
|
level = tab->code & 15; |
|
|
*last = (tab->code >> 12) & 1; |
|
|
} else { |
|
|
*run = (tab->code >> 8) & 255; |
|
|
level = tab->code & 255; |
|
|
*last = (tab->code >> 16) & 1; |
|
|
} |
|
|
return BitstreamGetBit(bs) ? -level : level; |
|
844 |
} |
} |
845 |
|
|
846 |
|
BitstreamSkip(bs, 7); |
847 |
|
|
848 |
if (short_video_header) { |
if (short_video_header) { |
849 |
/* escape mode 4 - H.263 type, only used if short_video_header = 1 */ |
/* escape mode 4 - H.263 type, only used if short_video_header = 1 */ |
850 |
*last = BitstreamGetBit(bs); |
*last = BitstreamGetBit(bs); |
854 |
if (level == 0 || level == 128) |
if (level == 0 || level == 128) |
855 |
DPRINTF(DPRINTF_ERROR, "Illegal LEVEL for ESCAPE mode 4: %d", level); |
DPRINTF(DPRINTF_ERROR, "Illegal LEVEL for ESCAPE mode 4: %d", level); |
856 |
|
|
857 |
return (level >= 128 ? -(256 - level) : level); |
return (level << 24) >> 24; |
858 |
} |
} |
859 |
|
|
860 |
mode = BitstreamShowBits(bs, 2); |
mode = BitstreamShowBits(bs, 2); |
862 |
if (mode < 3) { |
if (mode < 3) { |
863 |
BitstreamSkip(bs, (mode == 2) ? 2 : 1); |
BitstreamSkip(bs, (mode == 2) ? 2 : 1); |
864 |
|
|
865 |
tab = &DCT3D[intra][BitstreamShowBits(bs, 12)]; |
reverse_event = &DCT3D[intra][BitstreamShowBits(bs, 12)]; |
866 |
if (tab->code == -1) |
|
867 |
|
if ((level = reverse_event->event.level) == 0) |
868 |
goto error; |
goto error; |
869 |
|
|
870 |
BitstreamSkip(bs, tab->len); |
*last = reverse_event->event.last; |
871 |
|
*run = reverse_event->event.run; |
872 |
|
|
873 |
if (!intra) { |
BitstreamSkip(bs, reverse_event->len); |
|
*run = (tab->code >> 4) & 255; |
|
|
level = tab->code & 15; |
|
|
*last = (tab->code >> 12) & 1; |
|
|
} else { |
|
|
*run = (tab->code >> 8) & 255; |
|
|
level = tab->code & 255; |
|
|
*last = (tab->code >> 16) & 1; |
|
|
} |
|
874 |
|
|
875 |
if (mode < 2) /* first escape mode, level is offset */ |
if (mode < 2) /* first escape mode, level is offset */ |
876 |
level += max_level[*last + (!intra << 1)][*run]; /* need to add back the max level */ |
level += max_level[intra][*last][*run]; |
877 |
else if (mode == 2) /* second escape mode, run is offset */ |
else /* second escape mode, run is offset */ |
878 |
*run += max_run[*last + (!intra << 1)][level] + 1; |
*run += max_run[intra][*last][level] + 1; |
879 |
|
|
880 |
return BitstreamGetBit(bs) ? -level : level; |
return BitstreamGetBits(bs, 1) ? -level : level; |
881 |
} |
} |
882 |
|
|
883 |
/* third escape mode - fixed length codes */ |
/* third escape mode - fixed length codes */ |
884 |
BitstreamSkip(bs, 2); |
BitstreamSkip(bs, 2); |
885 |
*last = BitstreamGetBits(bs, 1); |
*last = BitstreamGetBits(bs, 1); |
888 |
level = BitstreamGetBits(bs, 12); |
level = BitstreamGetBits(bs, 12); |
889 |
BitstreamSkip(bs, 1); /* marker */ |
BitstreamSkip(bs, 1); /* marker */ |
890 |
|
|
891 |
return (level & 0x800) ? (level | (-1 ^ 0xfff)) : level; |
return (level << 20) >> 20; |
892 |
|
|
893 |
error: |
error: |
894 |
*run = VLC_ERROR; |
*run = VLC_ERROR; |
895 |
return 0; |
return 0; |
|
|
|
896 |
} |
} |
897 |
|
|
898 |
/***************************************************************************** |
/***************************************************************************** |