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Original Path: trunk/xvidcore/src/bitstream/mbcoding.c
1 : | Isibaar | 100 | #include <stdlib.h> |
2 : | Isibaar | 3 | #include "../portab.h" |
3 : | #include "bitstream.h" | ||
4 : | #include "zigzag.h" | ||
5 : | #include "vlc_codes.h" | ||
6 : | Isibaar | 100 | #include "mbcoding.h" |
7 : | Isibaar | 3 | |
8 : | #include "../utils/mbfunctions.h" | ||
9 : | |||
10 : | #define ABS(X) (((X)>0)?(X):-(X)) | ||
11 : | #define CLIP(X,A) (X > A) ? (A) : (X) | ||
12 : | |||
13 : | Isibaar | 100 | VLC intra_table[65536]; |
14 : | VLC inter_table[65536]; | ||
15 : | |||
16 : | Isibaar | 114 | VLC DCT3Dintra[4096]; |
17 : | VLC DCT3Dinter[4096]; | ||
18 : | Isibaar | 3 | |
19 : | Isibaar | 114 | static int16_t clip_table[4096]; |
20 : | |||
21 : | Isibaar | 100 | void init_vlc_tables(void) |
22 : | Isibaar | 3 | { |
23 : | edgomez | 78 | |
24 : | Isibaar | 3 | int32_t k, l, i, intra, last; |
25 : | VLC *vlc[2]; | ||
26 : | VLC **coeff_ptr; | ||
27 : | VLC *vlc1, *vlc2; | ||
28 : | |||
29 : | vlc1 = DCT3Dintra; | ||
30 : | vlc2 = DCT3Dinter; | ||
31 : | |||
32 : | Isibaar | 100 | vlc[0] = intra_table; |
33 : | vlc[1] = inter_table; | ||
34 : | Isibaar | 3 | |
35 : | // initialize the clipping table | ||
36 : | for(i = -2048; i < 2048; i++) { | ||
37 : | clip_table[i + 2048] = i; | ||
38 : | if(i < -255) | ||
39 : | clip_table[i + 2048] = -255; | ||
40 : | if(i > 255) | ||
41 : | clip_table[i + 2048] = 255; | ||
42 : | } | ||
43 : | |||
44 : | Isibaar | 100 | // generate encoding vlc lookup tables |
45 : | Isibaar | 3 | for(i = 0; i < 4; i++) { |
46 : | intra = i % 2; | ||
47 : | Isibaar | 100 | last = i / 2; |
48 : | Isibaar | 3 | |
49 : | Isibaar | 100 | coeff_ptr = coeff_vlc[last + 2 * intra]; |
50 : | Isibaar | 3 | |
51 : | for(k = -255; k < 256; k++) { // level | ||
52 : | Isibaar | 100 | int8_t *max_level_ptr = max_level[last + 2 * intra]; |
53 : | int8_t *max_run_ptr = max_run[last + 2 * intra]; | ||
54 : | Isibaar | 3 | |
55 : | for(l = 0; l < 64; l++) { // run | ||
56 : | Isibaar | 35 | int32_t level = k; |
57 : | uint32_t run = l; | ||
58 : | Isibaar | 100 | |
59 : | if((abs(level) <= max_level_ptr[run]) && | ||
60 : | (run <= max_run_ptr[abs(level)])) { // level < max_level and run < max_run | ||
61 : | |||
62 : | Isibaar | 3 | vlc[intra]->code = 0; |
63 : | vlc[intra]->len = 0; | ||
64 : | Isibaar | 100 | goto loop_end; |
65 : | } | ||
66 : | else { | ||
67 : | if(level > 0) // correct level | ||
68 : | Isibaar | 3 | level -= max_level_ptr[run]; |
69 : | else | ||
70 : | level += max_level_ptr[run]; | ||
71 : | Isibaar | 35 | |
72 : | Isibaar | 100 | if((abs(level) <= max_level_ptr[run]) && |
73 : | (run <= max_run_ptr[abs(level)])) { | ||
74 : | Isibaar | 28 | |
75 : | Isibaar | 100 | vlc[intra]->code = 0x06; |
76 : | vlc[intra]->len = 8; | ||
77 : | goto loop_end; | ||
78 : | } | ||
79 : | Isibaar | 3 | |
80 : | Isibaar | 100 | if(level > 0) // still here? |
81 : | level += max_level_ptr[run]; // restore level | ||
82 : | else | ||
83 : | level -= max_level_ptr[run]; | ||
84 : | |||
85 : | run -= max_run_ptr[abs(level)] + 1; // and change run | ||
86 : | |||
87 : | if((abs(level) <= max_level_ptr[run]) && | ||
88 : | (run <= max_run_ptr[abs(level)])) { | ||
89 : | |||
90 : | vlc[intra]->code = 0x0e; | ||
91 : | vlc[intra]->len = 9; | ||
92 : | goto loop_end; | ||
93 : | Isibaar | 3 | } |
94 : | Isibaar | 100 | run += max_run_ptr[abs(level)] + 1; |
95 : | Isibaar | 3 | } |
96 : | Isibaar | 100 | |
97 : | vlc[intra]->code = (uint32_t) ((l << 14) | (0x1e + last) << 20) | | ||
98 : | (1 << 13) | ((k & 0xfff) << 1) | 1; | ||
99 : | |||
100 : | vlc[intra]->len = 30; | ||
101 : | Isibaar | 3 | vlc[intra]++; |
102 : | Isibaar | 100 | continue; |
103 : | |||
104 : | loop_end: | ||
105 : | if(level != 0) { | ||
106 : | vlc[intra]->code = (vlc[intra]->code << (coeff_ptr[run][abs(level) - 1].len + 1)) | | ||
107 : | (coeff_ptr[run][abs(level) - 1].code << 1); | ||
108 : | vlc[intra]->len = (coeff_ptr[run][abs(level) - 1].len + 1) + vlc[intra]->len; | ||
109 : | |||
110 : | if(level < 0) | ||
111 : | vlc[intra]->code += 1; | ||
112 : | } | ||
113 : | |||
114 : | vlc[intra]++; | ||
115 : | Isibaar | 3 | } |
116 : | } | ||
117 : | } | ||
118 : | edgomez | 78 | |
119 : | Isibaar | 3 | for(i = 0; i < 4096; i++) { |
120 : | if(i >= 512) { | ||
121 : | *vlc1 = DCT3Dtab3[(i >> 5) - 16]; | ||
122 : | *vlc2 = DCT3Dtab0[(i >> 5) - 16]; | ||
123 : | } | ||
124 : | else if(i >= 128) { | ||
125 : | *vlc1 = DCT3Dtab4[(i >> 2) - 32]; | ||
126 : | *vlc2 = DCT3Dtab1[(i >> 2) - 32]; | ||
127 : | } | ||
128 : | else if(i >= 8) { | ||
129 : | *vlc1 = DCT3Dtab5[i - 8]; | ||
130 : | *vlc2 = DCT3Dtab2[i - 8]; | ||
131 : | } | ||
132 : | else { | ||
133 : | *vlc1 = ERRtab[i]; | ||
134 : | *vlc2 = ERRtab[i]; | ||
135 : | } | ||
136 : | |||
137 : | vlc1++; | ||
138 : | vlc2++; | ||
139 : | } | ||
140 : | DCT3D[0] = DCT3Dinter; | ||
141 : | DCT3D[1] = DCT3Dintra; | ||
142 : | |||
143 : | } | ||
144 : | |||
145 : | edgomez | 78 | static __inline void CodeVector(Bitstream *bs, |
146 : | int16_t value, | ||
147 : | int16_t f_code, | ||
148 : | Statistics *pStat) | ||
149 : | Isibaar | 3 | { |
150 : | edgomez | 78 | |
151 : | Isibaar | 3 | const int scale_factor = 1 << (f_code - 1); |
152 : | const int cmp = scale_factor << 5; | ||
153 : | |||
154 : | if(value < (-1 * cmp)) | ||
155 : | value += 64 * scale_factor; | ||
156 : | |||
157 : | if(value > (cmp - 1)) | ||
158 : | value -= 64 * scale_factor; | ||
159 : | |||
160 : | edgomez | 78 | pStat->iMvSum += value * value; |
161 : | pStat->iMvCount++; | ||
162 : | Isibaar | 3 | |
163 : | edgomez | 78 | if (value == 0) { |
164 : | Isibaar | 3 | BitstreamPutBits(bs, mb_motion_table[32].code, mb_motion_table[32].len); |
165 : | edgomez | 78 | } else { |
166 : | Isibaar | 3 | uint16_t length, code, mv_res, sign; |
167 : | |||
168 : | length = 16 << f_code; | ||
169 : | f_code--; | ||
170 : | |||
171 : | sign = (value < 0); | ||
172 : | |||
173 : | if(value >= length) | ||
174 : | value -= 2 * length; | ||
175 : | else if(value < -length) | ||
176 : | value += 2 * length; | ||
177 : | |||
178 : | if(sign) | ||
179 : | value = -value; | ||
180 : | |||
181 : | value--; | ||
182 : | mv_res = value & ((1 << f_code) - 1); | ||
183 : | code = ((value - mv_res) >> f_code) + 1; | ||
184 : | |||
185 : | if(sign) | ||
186 : | code = -code; | ||
187 : | |||
188 : | code += 32; | ||
189 : | BitstreamPutBits(bs, mb_motion_table[code].code, mb_motion_table[code].len); | ||
190 : | |||
191 : | if(f_code) | ||
192 : | BitstreamPutBits(bs, mv_res, f_code); | ||
193 : | edgomez | 78 | } |
194 : | |||
195 : | Isibaar | 3 | } |
196 : | |||
197 : | |||
198 : | edgomez | 78 | static __inline void CodeCoeff(Bitstream *bs, |
199 : | int16_t qcoeff[64], | ||
200 : | VLC *table, | ||
201 : | const uint16_t *zigzag, | ||
202 : | uint16_t intra) | ||
203 : | { | ||
204 : | |||
205 : | Isibaar | 3 | uint32_t j, last; |
206 : | short v; | ||
207 : | VLC *vlc; | ||
208 : | |||
209 : | j = intra; | ||
210 : | Isibaar | 116 | last = intra; |
211 : | Isibaar | 3 | |
212 : | Isibaar | 116 | while((v = qcoeff[zigzag[j]]) == 0) j++; |
213 : | Isibaar | 3 | |
214 : | do { | ||
215 : | // count zeroes | ||
216 : | Isibaar | 100 | vlc = table + 64*255 + (clip_table[2048+v] << 6) + j - last; |
217 : | Isibaar | 116 | last = ++j; |
218 : | while(j < 64 && (v = qcoeff[zigzag[j]]) == 0) j++; | ||
219 : | Isibaar | 3 | |
220 : | // write code | ||
221 : | if(j != 64) { | ||
222 : | BitstreamPutBits(bs, vlc->code, vlc->len); | ||
223 : | } else { | ||
224 : | vlc += 64*511; | ||
225 : | BitstreamPutBits(bs, vlc->code, vlc->len); | ||
226 : | break; | ||
227 : | } | ||
228 : | } while(1); | ||
229 : | edgomez | 78 | |
230 : | Isibaar | 3 | } |
231 : | |||
232 : | |||
233 : | edgomez | 78 | static void CodeBlockIntra(const MBParam * pParam, |
234 : | const MACROBLOCK *pMB, | ||
235 : | int16_t qcoeff[6*64], | ||
236 : | Bitstream * bs, | ||
237 : | Statistics * pStat) | ||
238 : | Isibaar | 3 | { |
239 : | edgomez | 78 | |
240 : | Isibaar | 3 | uint32_t i, mcbpc, cbpy, bits; |
241 : | |||
242 : | cbpy = pMB->cbp >> 2; | ||
243 : | |||
244 : | edgomez | 78 | // write mcbpc |
245 : | Isibaar | 28 | if(pParam->coding_type == I_VOP) { |
246 : | edgomez | 78 | mcbpc = ((pMB->mode >> 1) & 3) | ((pMB->cbp & 3) << 2); |
247 : | Isibaar | 28 | BitstreamPutBits(bs, mcbpc_intra_tab[mcbpc].code, mcbpc_intra_tab[mcbpc].len); |
248 : | } | ||
249 : | else { | ||
250 : | edgomez | 78 | mcbpc = (pMB->mode & 7) | ((pMB->cbp & 3) << 3); |
251 : | Isibaar | 28 | BitstreamPutBits(bs, mcbpc_inter_tab[mcbpc].code, mcbpc_inter_tab[mcbpc].len); |
252 : | } | ||
253 : | Isibaar | 3 | |
254 : | // ac prediction flag | ||
255 : | if(pMB->acpred_directions[0]) | ||
256 : | edgomez | 78 | BitstreamPutBits(bs, 1, 1); |
257 : | Isibaar | 3 | else |
258 : | edgomez | 78 | BitstreamPutBits(bs, 0, 1); |
259 : | Isibaar | 3 | |
260 : | edgomez | 78 | // write cbpy |
261 : | Isibaar | 3 | BitstreamPutBits (bs, cbpy_tab[cbpy].code, cbpy_tab[cbpy].len); |
262 : | |||
263 : | // write dquant | ||
264 : | edgomez | 78 | if(pMB->mode == MODE_INTRA_Q) |
265 : | Isibaar | 3 | BitstreamPutBits(bs, pMB->dquant, 2); |
266 : | |||
267 : | h | 69 | // write interlacing |
268 : | if (pParam->global_flags & XVID_INTERLACING) | ||
269 : | { | ||
270 : | BitstreamPutBit(bs, pMB->field_dct); | ||
271 : | } | ||
272 : | |||
273 : | Isibaar | 3 | // code block coeffs |
274 : | for(i = 0; i < 6; i++) | ||
275 : | { | ||
276 : | if(i < 4) | ||
277 : | edgomez | 78 | BitstreamPutBits(bs, |
278 : | dcy_tab[qcoeff[i*64 + 0] + 255].code, | ||
279 : | dcy_tab[qcoeff[i*64 + 0] + 255].len); | ||
280 : | Isibaar | 3 | else |
281 : | edgomez | 78 | BitstreamPutBits(bs, |
282 : | dcc_tab[qcoeff[i*64 + 0] + 255].code, | ||
283 : | dcc_tab[qcoeff[i*64 + 0] + 255].len); | ||
284 : | Isibaar | 3 | |
285 : | if(pMB->cbp & (1 << (5 - i))) | ||
286 : | { | ||
287 : | bits = BitstreamPos(bs); | ||
288 : | |||
289 : | edgomez | 78 | CodeCoeff(bs, |
290 : | &qcoeff[i*64], | ||
291 : | intra_table, | ||
292 : | scan_tables[pMB->acpred_directions[i]], | ||
293 : | 1); | ||
294 : | Isibaar | 3 | |
295 : | bits = BitstreamPos(bs) - bits; | ||
296 : | pStat->iTextBits += bits; | ||
297 : | } | ||
298 : | } | ||
299 : | edgomez | 78 | |
300 : | Isibaar | 3 | } |
301 : | |||
302 : | |||
303 : | edgomez | 78 | static void CodeBlockInter(const MBParam * pParam, |
304 : | const MACROBLOCK *pMB, | ||
305 : | int16_t qcoeff[6*64], | ||
306 : | Bitstream * bs, | ||
307 : | Statistics * pStat) | ||
308 : | Isibaar | 3 | { |
309 : | edgomez | 78 | |
310 : | Isibaar | 3 | int32_t i; |
311 : | uint32_t bits, mcbpc, cbpy; | ||
312 : | |||
313 : | edgomez | 78 | mcbpc = (pMB->mode & 7) | ((pMB->cbp & 3) << 3); |
314 : | Isibaar | 3 | cbpy = 15 - (pMB->cbp >> 2); |
315 : | |||
316 : | // write mcbpc | ||
317 : | edgomez | 78 | BitstreamPutBits(bs, mcbpc_inter_tab[mcbpc].code, mcbpc_inter_tab[mcbpc].len); |
318 : | Isibaar | 3 | |
319 : | // write cbpy | ||
320 : | BitstreamPutBits(bs, cbpy_tab[cbpy].code, cbpy_tab[cbpy].len); | ||
321 : | |||
322 : | // write dquant | ||
323 : | edgomez | 78 | if(pMB->mode == MODE_INTER_Q) |
324 : | Isibaar | 3 | BitstreamPutBits(bs, pMB->dquant, 2); |
325 : | |||
326 : | h | 69 | // interlacing |
327 : | if (pParam->global_flags & XVID_INTERLACING) | ||
328 : | { | ||
329 : | BitstreamPutBit(bs, pMB->field_dct); | ||
330 : | DEBUG1("codep: field_dct: ", pMB->field_dct); | ||
331 : | |||
332 : | // if inter block, write field ME flag | ||
333 : | if (pMB->mode == MODE_INTER || pMB->mode == MODE_INTER_Q) | ||
334 : | { | ||
335 : | BitstreamPutBit(bs, pMB->field_pred); | ||
336 : | DEBUG1("codep: field_pred: ", pMB->field_pred); | ||
337 : | |||
338 : | // write field prediction references | ||
339 : | if (pMB->field_pred) | ||
340 : | { | ||
341 : | BitstreamPutBit(bs, pMB->field_for_top); | ||
342 : | BitstreamPutBit(bs, pMB->field_for_bot); | ||
343 : | } | ||
344 : | } | ||
345 : | } | ||
346 : | |||
347 : | Isibaar | 3 | // code motion vector(s) |
348 : | for(i = 0; i < (pMB->mode == MODE_INTER4V ? 4 : 1); i++) | ||
349 : | { | ||
350 : | CodeVector(bs, pMB->pmvs[i].x, pParam->fixed_code, pStat); | ||
351 : | CodeVector(bs, pMB->pmvs[i].y, pParam->fixed_code, pStat); | ||
352 : | } | ||
353 : | |||
354 : | bits = BitstreamPos(bs); | ||
355 : | |||
356 : | // code block coeffs | ||
357 : | for(i = 0; i < 6; i++) | ||
358 : | if(pMB->cbp & (1 << (5 - i))) | ||
359 : | edgomez | 78 | CodeCoeff(bs, &qcoeff[i*64], inter_table, scan_tables[0], 0); |
360 : | Isibaar | 3 | |
361 : | bits = BitstreamPos(bs) - bits; | ||
362 : | pStat->iTextBits += bits; | ||
363 : | edgomez | 78 | |
364 : | Isibaar | 3 | } |
365 : | |||
366 : | |||
367 : | edgomez | 78 | void MBCoding(const MBParam * pParam, |
368 : | MACROBLOCK *pMB, | ||
369 : | int16_t qcoeff[6*64], | ||
370 : | Bitstream * bs, | ||
371 : | Statistics * pStat) | ||
372 : | Isibaar | 3 | { |
373 : | edgomez | 78 | |
374 : | Isibaar | 3 | int intra = (pMB->mode == MODE_INTRA || pMB->mode == MODE_INTRA_Q); |
375 : | |||
376 : | edgomez | 78 | if(pParam->coding_type == P_VOP) { |
377 : | Isibaar | 3 | if(pMB->cbp == 0 && pMB->mode == MODE_INTER && |
378 : | edgomez | 78 | pMB->mvs[0].x == 0 && pMB->mvs[0].y == 0) |
379 : | Isibaar | 3 | { |
380 : | BitstreamPutBit(bs, 1); // not_coded | ||
381 : | return; | ||
382 : | } | ||
383 : | else | ||
384 : | BitstreamPutBit(bs, 0); // coded | ||
385 : | } | ||
386 : | |||
387 : | if(intra) | ||
388 : | CodeBlockIntra(pParam, pMB, qcoeff, bs, pStat); | ||
389 : | else | ||
390 : | CodeBlockInter(pParam, pMB, qcoeff, bs, pStat); | ||
391 : | edgomez | 78 | |
392 : | Isibaar | 3 | } |
393 : | |||
394 : | |||
395 : | /*************************************************************** | ||
396 : | edgomez | 15 | * decoding stuff starts here * |
397 : | ***************************************************************/ | ||
398 : | Isibaar | 3 | |
399 : | int get_mcbpc_intra(Bitstream * bs) | ||
400 : | { | ||
401 : | edgomez | 78 | |
402 : | Isibaar | 3 | uint32_t index; |
403 : | |||
404 : | while((index = BitstreamShowBits(bs, 9)) == 1) | ||
405 : | BitstreamSkip(bs, 9); | ||
406 : | |||
407 : | index >>= 3; | ||
408 : | |||
409 : | BitstreamSkip(bs, mcbpc_intra_table[index].len); | ||
410 : | edgomez | 78 | |
411 : | Isibaar | 3 | return mcbpc_intra_table[index].code; |
412 : | edgomez | 78 | |
413 : | Isibaar | 3 | } |
414 : | |||
415 : | int get_mcbpc_inter(Bitstream * bs) | ||
416 : | { | ||
417 : | edgomez | 78 | |
418 : | Isibaar | 3 | uint32_t index; |
419 : | |||
420 : | while((index = CLIP(BitstreamShowBits(bs, 9), 256)) == 1) | ||
421 : | BitstreamSkip(bs, 9); | ||
422 : | |||
423 : | edgomez | 78 | BitstreamSkip(bs, mcbpc_inter_table[index].len); |
424 : | |||
425 : | Isibaar | 3 | return mcbpc_inter_table[index].code; |
426 : | edgomez | 78 | |
427 : | Isibaar | 3 | } |
428 : | |||
429 : | int get_cbpy(Bitstream * bs, int intra) | ||
430 : | { | ||
431 : | edgomez | 78 | |
432 : | Isibaar | 3 | int cbpy; |
433 : | uint32_t index = BitstreamShowBits(bs, 6); | ||
434 : | |||
435 : | BitstreamSkip(bs, cbpy_table[index].len); | ||
436 : | cbpy = cbpy_table[index].code; | ||
437 : | |||
438 : | if(!intra) | ||
439 : | cbpy = 15 - cbpy; | ||
440 : | |||
441 : | return cbpy; | ||
442 : | edgomez | 78 | |
443 : | Isibaar | 3 | } |
444 : | |||
445 : | int get_mv_data(Bitstream * bs) | ||
446 : | { | ||
447 : | edgomez | 78 | |
448 : | Isibaar | 3 | uint32_t index; |
449 : | |||
450 : | if(BitstreamGetBit(bs)) | ||
451 : | return 0; | ||
452 : | |||
453 : | index = BitstreamShowBits(bs, 12); | ||
454 : | |||
455 : | if(index >= 512) | ||
456 : | { | ||
457 : | index = (index >> 8) - 2; | ||
458 : | BitstreamSkip(bs, TMNMVtab0[index].len); | ||
459 : | return TMNMVtab0[index].code; | ||
460 : | } | ||
461 : | |||
462 : | if(index >= 128) | ||
463 : | { | ||
464 : | index = (index >> 2) - 32; | ||
465 : | BitstreamSkip(bs, TMNMVtab1[index].len); | ||
466 : | return TMNMVtab1[index].code; | ||
467 : | } | ||
468 : | |||
469 : | index -= 4; | ||
470 : | |||
471 : | BitstreamSkip(bs, TMNMVtab2[index].len); | ||
472 : | return TMNMVtab2[index].code; | ||
473 : | edgomez | 78 | |
474 : | Isibaar | 3 | } |
475 : | |||
476 : | int get_mv(Bitstream * bs, int fcode) | ||
477 : | { | ||
478 : | edgomez | 78 | |
479 : | Isibaar | 3 | int data; |
480 : | int res; | ||
481 : | int mv; | ||
482 : | int scale_fac = 1 << (fcode - 1); | ||
483 : | |||
484 : | data = get_mv_data(bs); | ||
485 : | |||
486 : | if(scale_fac == 1 || data == 0) | ||
487 : | return data; | ||
488 : | |||
489 : | res = BitstreamGetBits(bs, fcode - 1); | ||
490 : | mv = ((ABS(data) - 1) * scale_fac) + res + 1; | ||
491 : | |||
492 : | return data < 0 ? -mv : mv; | ||
493 : | edgomez | 78 | |
494 : | Isibaar | 3 | } |
495 : | |||
496 : | int get_dc_dif(Bitstream * bs, uint32_t dc_size) | ||
497 : | { | ||
498 : | edgomez | 78 | |
499 : | Isibaar | 3 | int code = BitstreamGetBits(bs, dc_size); |
500 : | int msb = code >> (dc_size - 1); | ||
501 : | |||
502 : | if(msb == 0) | ||
503 : | return (-1 * (code^((1 << dc_size) - 1))); | ||
504 : | |||
505 : | return code; | ||
506 : | edgomez | 78 | |
507 : | Isibaar | 3 | } |
508 : | |||
509 : | int get_dc_size_lum(Bitstream * bs) | ||
510 : | { | ||
511 : | edgomez | 78 | |
512 : | Isibaar | 3 | int code, i; |
513 : | code = BitstreamShowBits(bs, 11); | ||
514 : | |||
515 : | for(i = 11; i > 3; i--) { | ||
516 : | if(code == 1) { | ||
517 : | BitstreamSkip(bs, i); | ||
518 : | return i + 1; | ||
519 : | } | ||
520 : | code >>= 1; | ||
521 : | } | ||
522 : | |||
523 : | BitstreamSkip(bs, dc_lum_tab[code].len); | ||
524 : | return dc_lum_tab[code].code; | ||
525 : | edgomez | 78 | |
526 : | Isibaar | 3 | } |
527 : | |||
528 : | |||
529 : | int get_dc_size_chrom(Bitstream * bs) | ||
530 : | { | ||
531 : | edgomez | 78 | |
532 : | Isibaar | 3 | uint32_t code, i; |
533 : | code = BitstreamShowBits(bs, 12); | ||
534 : | |||
535 : | for(i = 12; i > 2; i--) { | ||
536 : | if(code == 1) { | ||
537 : | BitstreamSkip(bs, i); | ||
538 : | return i; | ||
539 : | } | ||
540 : | code >>= 1; | ||
541 : | } | ||
542 : | |||
543 : | return 3 - BitstreamGetBits(bs, 2); | ||
544 : | edgomez | 78 | |
545 : | Isibaar | 3 | } |
546 : | |||
547 : | void get_intra_block(Bitstream * bs, int16_t * block, int direction, int coeff) | ||
548 : | { | ||
549 : | edgomez | 78 | |
550 : | Isibaar | 3 | const uint16_t * scan = scan_tables[ direction ]; |
551 : | int level; | ||
552 : | int run; | ||
553 : | int last; | ||
554 : | |||
555 : | do | ||
556 : | { | ||
557 : | level = get_coeff(bs, &run, &last, 1, 0); | ||
558 : | if (run == -1) | ||
559 : | { | ||
560 : | DEBUG("fatal: invalid run"); | ||
561 : | break; | ||
562 : | } | ||
563 : | coeff += run; | ||
564 : | block[ scan[coeff] ] = level; | ||
565 : | if (level < -127 || level > 127) | ||
566 : | { | ||
567 : | DEBUG1("warning: intra_overflow", level); | ||
568 : | } | ||
569 : | coeff++; | ||
570 : | } while (!last); | ||
571 : | edgomez | 78 | |
572 : | Isibaar | 3 | } |
573 : | |||
574 : | void get_inter_block(Bitstream * bs, int16_t * block) | ||
575 : | { | ||
576 : | edgomez | 78 | |
577 : | Isibaar | 3 | const uint16_t * scan = scan_tables[0]; |
578 : | int p; | ||
579 : | int level; | ||
580 : | int run; | ||
581 : | int last; | ||
582 : | |||
583 : | p = 0; | ||
584 : | do | ||
585 : | { | ||
586 : | level = get_coeff(bs, &run, &last, 0, 0); | ||
587 : | if (run == -1) | ||
588 : | { | ||
589 : | DEBUG("fatal: invalid run"); | ||
590 : | break; | ||
591 : | } | ||
592 : | p += run; | ||
593 : | block[ scan[p] ] = level; | ||
594 : | if (level < -127 || level > 127) | ||
595 : | { | ||
596 : | DEBUG1("warning: inter_overflow", level); | ||
597 : | } | ||
598 : | p++; | ||
599 : | } while (!last); | ||
600 : | edgomez | 78 | |
601 : | Isibaar | 3 | } |
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