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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 ESCAPE 7167 | ||
11 : | #define ABS(X) (((X)>0)?(X):-(X)) | ||
12 : | #define CLIP(X,A) (X > A) ? (A) : (X) | ||
13 : | |||
14 : | Isibaar | 100 | VLC DCT3Dintra[4096]; |
15 : | VLC DCT3Dinter[4096]; | ||
16 : | Isibaar | 3 | static VLC *DCT3D[2]; |
17 : | |||
18 : | Isibaar | 100 | VLC intra_table[65536]; |
19 : | VLC inter_table[65536]; | ||
20 : | |||
21 : | Isibaar | 3 | static short clip_table[4096]; |
22 : | |||
23 : | Isibaar | 100 | void init_vlc_tables(void) |
24 : | Isibaar | 3 | { |
25 : | edgomez | 78 | |
26 : | Isibaar | 3 | int32_t k, l, i, intra, last; |
27 : | VLC *vlc[2]; | ||
28 : | VLC **coeff_ptr; | ||
29 : | VLC *vlc1, *vlc2; | ||
30 : | |||
31 : | vlc1 = DCT3Dintra; | ||
32 : | vlc2 = DCT3Dinter; | ||
33 : | |||
34 : | Isibaar | 100 | vlc[0] = intra_table; |
35 : | vlc[1] = inter_table; | ||
36 : | Isibaar | 3 | |
37 : | // initialize the clipping table | ||
38 : | for(i = -2048; i < 2048; i++) { | ||
39 : | clip_table[i + 2048] = i; | ||
40 : | if(i < -255) | ||
41 : | clip_table[i + 2048] = -255; | ||
42 : | if(i > 255) | ||
43 : | clip_table[i + 2048] = 255; | ||
44 : | } | ||
45 : | |||
46 : | Isibaar | 100 | // generate encoding vlc lookup tables |
47 : | Isibaar | 3 | for(i = 0; i < 4; i++) { |
48 : | intra = i % 2; | ||
49 : | Isibaar | 100 | last = i / 2; |
50 : | Isibaar | 3 | |
51 : | Isibaar | 100 | coeff_ptr = coeff_vlc[last + 2 * intra]; |
52 : | Isibaar | 3 | |
53 : | for(k = -255; k < 256; k++) { // level | ||
54 : | Isibaar | 100 | int8_t *max_level_ptr = max_level[last + 2 * intra]; |
55 : | int8_t *max_run_ptr = max_run[last + 2 * intra]; | ||
56 : | Isibaar | 3 | |
57 : | for(l = 0; l < 64; l++) { // run | ||
58 : | Isibaar | 35 | int32_t level = k; |
59 : | uint32_t run = l; | ||
60 : | Isibaar | 100 | |
61 : | if((abs(level) <= max_level_ptr[run]) && | ||
62 : | (run <= max_run_ptr[abs(level)])) { // level < max_level and run < max_run | ||
63 : | |||
64 : | Isibaar | 3 | vlc[intra]->code = 0; |
65 : | vlc[intra]->len = 0; | ||
66 : | Isibaar | 100 | goto loop_end; |
67 : | } | ||
68 : | else { | ||
69 : | if(level > 0) // correct level | ||
70 : | Isibaar | 3 | level -= max_level_ptr[run]; |
71 : | else | ||
72 : | level += max_level_ptr[run]; | ||
73 : | Isibaar | 35 | |
74 : | Isibaar | 100 | if((abs(level) <= max_level_ptr[run]) && |
75 : | (run <= max_run_ptr[abs(level)])) { | ||
76 : | Isibaar | 28 | |
77 : | Isibaar | 100 | vlc[intra]->code = 0x06; |
78 : | vlc[intra]->len = 8; | ||
79 : | goto loop_end; | ||
80 : | } | ||
81 : | Isibaar | 3 | |
82 : | Isibaar | 100 | if(level > 0) // still here? |
83 : | level += max_level_ptr[run]; // restore level | ||
84 : | else | ||
85 : | level -= max_level_ptr[run]; | ||
86 : | |||
87 : | run -= max_run_ptr[abs(level)] + 1; // and change run | ||
88 : | |||
89 : | if((abs(level) <= max_level_ptr[run]) && | ||
90 : | (run <= max_run_ptr[abs(level)])) { | ||
91 : | |||
92 : | vlc[intra]->code = 0x0e; | ||
93 : | vlc[intra]->len = 9; | ||
94 : | goto loop_end; | ||
95 : | Isibaar | 3 | } |
96 : | Isibaar | 100 | run += max_run_ptr[abs(level)] + 1; |
97 : | Isibaar | 3 | } |
98 : | Isibaar | 100 | |
99 : | vlc[intra]->code = (uint32_t) ((l << 14) | (0x1e + last) << 20) | | ||
100 : | (1 << 13) | ((k & 0xfff) << 1) | 1; | ||
101 : | |||
102 : | vlc[intra]->len = 30; | ||
103 : | Isibaar | 3 | vlc[intra]++; |
104 : | Isibaar | 100 | continue; |
105 : | |||
106 : | loop_end: | ||
107 : | if(level != 0) { | ||
108 : | vlc[intra]->code = (vlc[intra]->code << (coeff_ptr[run][abs(level) - 1].len + 1)) | | ||
109 : | (coeff_ptr[run][abs(level) - 1].code << 1); | ||
110 : | vlc[intra]->len = (coeff_ptr[run][abs(level) - 1].len + 1) + vlc[intra]->len; | ||
111 : | |||
112 : | if(level < 0) | ||
113 : | vlc[intra]->code += 1; | ||
114 : | } | ||
115 : | |||
116 : | vlc[intra]++; | ||
117 : | Isibaar | 3 | } |
118 : | } | ||
119 : | } | ||
120 : | edgomez | 78 | |
121 : | Isibaar | 3 | for(i = 0; i < 4096; i++) { |
122 : | if(i >= 512) { | ||
123 : | *vlc1 = DCT3Dtab3[(i >> 5) - 16]; | ||
124 : | *vlc2 = DCT3Dtab0[(i >> 5) - 16]; | ||
125 : | } | ||
126 : | else if(i >= 128) { | ||
127 : | *vlc1 = DCT3Dtab4[(i >> 2) - 32]; | ||
128 : | *vlc2 = DCT3Dtab1[(i >> 2) - 32]; | ||
129 : | } | ||
130 : | else if(i >= 8) { | ||
131 : | *vlc1 = DCT3Dtab5[i - 8]; | ||
132 : | *vlc2 = DCT3Dtab2[i - 8]; | ||
133 : | } | ||
134 : | else { | ||
135 : | *vlc1 = ERRtab[i]; | ||
136 : | *vlc2 = ERRtab[i]; | ||
137 : | } | ||
138 : | |||
139 : | vlc1++; | ||
140 : | vlc2++; | ||
141 : | } | ||
142 : | DCT3D[0] = DCT3Dinter; | ||
143 : | DCT3D[1] = DCT3Dintra; | ||
144 : | |||
145 : | } | ||
146 : | |||
147 : | edgomez | 78 | static __inline void CodeVector(Bitstream *bs, |
148 : | int16_t value, | ||
149 : | int16_t f_code, | ||
150 : | Statistics *pStat) | ||
151 : | Isibaar | 3 | { |
152 : | edgomez | 78 | |
153 : | Isibaar | 3 | const int scale_factor = 1 << (f_code - 1); |
154 : | const int cmp = scale_factor << 5; | ||
155 : | |||
156 : | if(value < (-1 * cmp)) | ||
157 : | value += 64 * scale_factor; | ||
158 : | |||
159 : | if(value > (cmp - 1)) | ||
160 : | value -= 64 * scale_factor; | ||
161 : | |||
162 : | edgomez | 78 | pStat->iMvSum += value * value; |
163 : | pStat->iMvCount++; | ||
164 : | Isibaar | 3 | |
165 : | edgomez | 78 | if (value == 0) { |
166 : | Isibaar | 3 | BitstreamPutBits(bs, mb_motion_table[32].code, mb_motion_table[32].len); |
167 : | edgomez | 78 | } else { |
168 : | Isibaar | 3 | uint16_t length, code, mv_res, sign; |
169 : | |||
170 : | length = 16 << f_code; | ||
171 : | f_code--; | ||
172 : | |||
173 : | sign = (value < 0); | ||
174 : | |||
175 : | if(value >= length) | ||
176 : | value -= 2 * length; | ||
177 : | else if(value < -length) | ||
178 : | value += 2 * length; | ||
179 : | |||
180 : | if(sign) | ||
181 : | value = -value; | ||
182 : | |||
183 : | value--; | ||
184 : | mv_res = value & ((1 << f_code) - 1); | ||
185 : | code = ((value - mv_res) >> f_code) + 1; | ||
186 : | |||
187 : | if(sign) | ||
188 : | code = -code; | ||
189 : | |||
190 : | code += 32; | ||
191 : | BitstreamPutBits(bs, mb_motion_table[code].code, mb_motion_table[code].len); | ||
192 : | |||
193 : | if(f_code) | ||
194 : | BitstreamPutBits(bs, mv_res, f_code); | ||
195 : | edgomez | 78 | } |
196 : | |||
197 : | Isibaar | 3 | } |
198 : | |||
199 : | |||
200 : | edgomez | 78 | static __inline void CodeCoeff(Bitstream *bs, |
201 : | int16_t qcoeff[64], | ||
202 : | VLC *table, | ||
203 : | const uint16_t *zigzag, | ||
204 : | uint16_t intra) | ||
205 : | { | ||
206 : | |||
207 : | Isibaar | 3 | uint32_t j, last; |
208 : | short v; | ||
209 : | VLC *vlc; | ||
210 : | |||
211 : | j = intra; | ||
212 : | last = 1 + intra; | ||
213 : | |||
214 : | while((v = qcoeff[zigzag[j++]]) == 0); | ||
215 : | |||
216 : | do { | ||
217 : | // count zeroes | ||
218 : | Isibaar | 100 | vlc = table + 64*255 + (clip_table[2048+v] << 6) + j - last; |
219 : | Isibaar | 3 | last = j + 1; |
220 : | while(j < 64 && (v = qcoeff[zigzag[j++]]) == 0); | ||
221 : | |||
222 : | // write code | ||
223 : | if(j != 64) { | ||
224 : | BitstreamPutBits(bs, vlc->code, vlc->len); | ||
225 : | } else { | ||
226 : | vlc += 64*511; | ||
227 : | BitstreamPutBits(bs, vlc->code, vlc->len); | ||
228 : | break; | ||
229 : | } | ||
230 : | } while(1); | ||
231 : | edgomez | 78 | |
232 : | Isibaar | 3 | } |
233 : | |||
234 : | |||
235 : | edgomez | 78 | static void CodeBlockIntra(const MBParam * pParam, |
236 : | const MACROBLOCK *pMB, | ||
237 : | int16_t qcoeff[6*64], | ||
238 : | Bitstream * bs, | ||
239 : | Statistics * pStat) | ||
240 : | Isibaar | 3 | { |
241 : | edgomez | 78 | |
242 : | Isibaar | 3 | uint32_t i, mcbpc, cbpy, bits; |
243 : | |||
244 : | cbpy = pMB->cbp >> 2; | ||
245 : | |||
246 : | edgomez | 78 | // write mcbpc |
247 : | Isibaar | 28 | if(pParam->coding_type == I_VOP) { |
248 : | edgomez | 78 | mcbpc = ((pMB->mode >> 1) & 3) | ((pMB->cbp & 3) << 2); |
249 : | Isibaar | 28 | BitstreamPutBits(bs, mcbpc_intra_tab[mcbpc].code, mcbpc_intra_tab[mcbpc].len); |
250 : | } | ||
251 : | else { | ||
252 : | edgomez | 78 | mcbpc = (pMB->mode & 7) | ((pMB->cbp & 3) << 3); |
253 : | Isibaar | 28 | BitstreamPutBits(bs, mcbpc_inter_tab[mcbpc].code, mcbpc_inter_tab[mcbpc].len); |
254 : | } | ||
255 : | Isibaar | 3 | |
256 : | // ac prediction flag | ||
257 : | if(pMB->acpred_directions[0]) | ||
258 : | edgomez | 78 | BitstreamPutBits(bs, 1, 1); |
259 : | Isibaar | 3 | else |
260 : | edgomez | 78 | BitstreamPutBits(bs, 0, 1); |
261 : | Isibaar | 3 | |
262 : | edgomez | 78 | // write cbpy |
263 : | Isibaar | 3 | BitstreamPutBits (bs, cbpy_tab[cbpy].code, cbpy_tab[cbpy].len); |
264 : | |||
265 : | // write dquant | ||
266 : | edgomez | 78 | if(pMB->mode == MODE_INTRA_Q) |
267 : | Isibaar | 3 | BitstreamPutBits(bs, pMB->dquant, 2); |
268 : | |||
269 : | h | 69 | // write interlacing |
270 : | if (pParam->global_flags & XVID_INTERLACING) | ||
271 : | { | ||
272 : | BitstreamPutBit(bs, pMB->field_dct); | ||
273 : | } | ||
274 : | |||
275 : | Isibaar | 3 | // code block coeffs |
276 : | for(i = 0; i < 6; i++) | ||
277 : | { | ||
278 : | if(i < 4) | ||
279 : | edgomez | 78 | BitstreamPutBits(bs, |
280 : | dcy_tab[qcoeff[i*64 + 0] + 255].code, | ||
281 : | dcy_tab[qcoeff[i*64 + 0] + 255].len); | ||
282 : | Isibaar | 3 | else |
283 : | edgomez | 78 | BitstreamPutBits(bs, |
284 : | dcc_tab[qcoeff[i*64 + 0] + 255].code, | ||
285 : | dcc_tab[qcoeff[i*64 + 0] + 255].len); | ||
286 : | Isibaar | 3 | |
287 : | if(pMB->cbp & (1 << (5 - i))) | ||
288 : | { | ||
289 : | bits = BitstreamPos(bs); | ||
290 : | |||
291 : | edgomez | 78 | CodeCoeff(bs, |
292 : | &qcoeff[i*64], | ||
293 : | intra_table, | ||
294 : | scan_tables[pMB->acpred_directions[i]], | ||
295 : | 1); | ||
296 : | Isibaar | 3 | |
297 : | bits = BitstreamPos(bs) - bits; | ||
298 : | pStat->iTextBits += bits; | ||
299 : | } | ||
300 : | } | ||
301 : | edgomez | 78 | |
302 : | Isibaar | 3 | } |
303 : | |||
304 : | |||
305 : | edgomez | 78 | static void CodeBlockInter(const MBParam * pParam, |
306 : | const MACROBLOCK *pMB, | ||
307 : | int16_t qcoeff[6*64], | ||
308 : | Bitstream * bs, | ||
309 : | Statistics * pStat) | ||
310 : | Isibaar | 3 | { |
311 : | edgomez | 78 | |
312 : | Isibaar | 3 | int32_t i; |
313 : | uint32_t bits, mcbpc, cbpy; | ||
314 : | |||
315 : | edgomez | 78 | mcbpc = (pMB->mode & 7) | ((pMB->cbp & 3) << 3); |
316 : | Isibaar | 3 | cbpy = 15 - (pMB->cbp >> 2); |
317 : | |||
318 : | // write mcbpc | ||
319 : | edgomez | 78 | BitstreamPutBits(bs, mcbpc_inter_tab[mcbpc].code, mcbpc_inter_tab[mcbpc].len); |
320 : | Isibaar | 3 | |
321 : | // write cbpy | ||
322 : | BitstreamPutBits(bs, cbpy_tab[cbpy].code, cbpy_tab[cbpy].len); | ||
323 : | |||
324 : | // write dquant | ||
325 : | edgomez | 78 | if(pMB->mode == MODE_INTER_Q) |
326 : | Isibaar | 3 | BitstreamPutBits(bs, pMB->dquant, 2); |
327 : | |||
328 : | h | 69 | // interlacing |
329 : | if (pParam->global_flags & XVID_INTERLACING) | ||
330 : | { | ||
331 : | BitstreamPutBit(bs, pMB->field_dct); | ||
332 : | DEBUG1("codep: field_dct: ", pMB->field_dct); | ||
333 : | |||
334 : | // if inter block, write field ME flag | ||
335 : | if (pMB->mode == MODE_INTER || pMB->mode == MODE_INTER_Q) | ||
336 : | { | ||
337 : | BitstreamPutBit(bs, pMB->field_pred); | ||
338 : | DEBUG1("codep: field_pred: ", pMB->field_pred); | ||
339 : | |||
340 : | // write field prediction references | ||
341 : | if (pMB->field_pred) | ||
342 : | { | ||
343 : | BitstreamPutBit(bs, pMB->field_for_top); | ||
344 : | BitstreamPutBit(bs, pMB->field_for_bot); | ||
345 : | } | ||
346 : | } | ||
347 : | } | ||
348 : | |||
349 : | Isibaar | 3 | // code motion vector(s) |
350 : | for(i = 0; i < (pMB->mode == MODE_INTER4V ? 4 : 1); i++) | ||
351 : | { | ||
352 : | CodeVector(bs, pMB->pmvs[i].x, pParam->fixed_code, pStat); | ||
353 : | CodeVector(bs, pMB->pmvs[i].y, pParam->fixed_code, pStat); | ||
354 : | } | ||
355 : | |||
356 : | bits = BitstreamPos(bs); | ||
357 : | |||
358 : | // code block coeffs | ||
359 : | for(i = 0; i < 6; i++) | ||
360 : | if(pMB->cbp & (1 << (5 - i))) | ||
361 : | edgomez | 78 | CodeCoeff(bs, &qcoeff[i*64], inter_table, scan_tables[0], 0); |
362 : | Isibaar | 3 | |
363 : | bits = BitstreamPos(bs) - bits; | ||
364 : | pStat->iTextBits += bits; | ||
365 : | edgomez | 78 | |
366 : | Isibaar | 3 | } |
367 : | |||
368 : | |||
369 : | edgomez | 78 | void MBCoding(const MBParam * pParam, |
370 : | MACROBLOCK *pMB, | ||
371 : | int16_t qcoeff[6*64], | ||
372 : | Bitstream * bs, | ||
373 : | Statistics * pStat) | ||
374 : | Isibaar | 3 | { |
375 : | edgomez | 78 | |
376 : | Isibaar | 3 | int intra = (pMB->mode == MODE_INTRA || pMB->mode == MODE_INTRA_Q); |
377 : | |||
378 : | edgomez | 78 | if(pParam->coding_type == P_VOP) { |
379 : | Isibaar | 3 | if(pMB->cbp == 0 && pMB->mode == MODE_INTER && |
380 : | edgomez | 78 | pMB->mvs[0].x == 0 && pMB->mvs[0].y == 0) |
381 : | Isibaar | 3 | { |
382 : | BitstreamPutBit(bs, 1); // not_coded | ||
383 : | return; | ||
384 : | } | ||
385 : | else | ||
386 : | BitstreamPutBit(bs, 0); // coded | ||
387 : | } | ||
388 : | |||
389 : | if(intra) | ||
390 : | CodeBlockIntra(pParam, pMB, qcoeff, bs, pStat); | ||
391 : | else | ||
392 : | CodeBlockInter(pParam, pMB, qcoeff, bs, pStat); | ||
393 : | edgomez | 78 | |
394 : | Isibaar | 3 | } |
395 : | |||
396 : | |||
397 : | /*************************************************************** | ||
398 : | edgomez | 15 | * decoding stuff starts here * |
399 : | ***************************************************************/ | ||
400 : | Isibaar | 3 | |
401 : | int get_mcbpc_intra(Bitstream * bs) | ||
402 : | { | ||
403 : | edgomez | 78 | |
404 : | Isibaar | 3 | uint32_t index; |
405 : | |||
406 : | while((index = BitstreamShowBits(bs, 9)) == 1) | ||
407 : | BitstreamSkip(bs, 9); | ||
408 : | |||
409 : | index >>= 3; | ||
410 : | |||
411 : | BitstreamSkip(bs, mcbpc_intra_table[index].len); | ||
412 : | edgomez | 78 | |
413 : | Isibaar | 3 | return mcbpc_intra_table[index].code; |
414 : | edgomez | 78 | |
415 : | Isibaar | 3 | } |
416 : | |||
417 : | int get_mcbpc_inter(Bitstream * bs) | ||
418 : | { | ||
419 : | edgomez | 78 | |
420 : | Isibaar | 3 | uint32_t index; |
421 : | |||
422 : | while((index = CLIP(BitstreamShowBits(bs, 9), 256)) == 1) | ||
423 : | BitstreamSkip(bs, 9); | ||
424 : | |||
425 : | edgomez | 78 | BitstreamSkip(bs, mcbpc_inter_table[index].len); |
426 : | |||
427 : | Isibaar | 3 | return mcbpc_inter_table[index].code; |
428 : | edgomez | 78 | |
429 : | Isibaar | 3 | } |
430 : | |||
431 : | int get_cbpy(Bitstream * bs, int intra) | ||
432 : | { | ||
433 : | edgomez | 78 | |
434 : | Isibaar | 3 | int cbpy; |
435 : | uint32_t index = BitstreamShowBits(bs, 6); | ||
436 : | |||
437 : | BitstreamSkip(bs, cbpy_table[index].len); | ||
438 : | cbpy = cbpy_table[index].code; | ||
439 : | |||
440 : | if(!intra) | ||
441 : | cbpy = 15 - cbpy; | ||
442 : | |||
443 : | return cbpy; | ||
444 : | edgomez | 78 | |
445 : | Isibaar | 3 | } |
446 : | |||
447 : | int get_mv_data(Bitstream * bs) | ||
448 : | { | ||
449 : | edgomez | 78 | |
450 : | Isibaar | 3 | uint32_t index; |
451 : | |||
452 : | if(BitstreamGetBit(bs)) | ||
453 : | return 0; | ||
454 : | |||
455 : | index = BitstreamShowBits(bs, 12); | ||
456 : | |||
457 : | if(index >= 512) | ||
458 : | { | ||
459 : | index = (index >> 8) - 2; | ||
460 : | BitstreamSkip(bs, TMNMVtab0[index].len); | ||
461 : | return TMNMVtab0[index].code; | ||
462 : | } | ||
463 : | |||
464 : | if(index >= 128) | ||
465 : | { | ||
466 : | index = (index >> 2) - 32; | ||
467 : | BitstreamSkip(bs, TMNMVtab1[index].len); | ||
468 : | return TMNMVtab1[index].code; | ||
469 : | } | ||
470 : | |||
471 : | index -= 4; | ||
472 : | |||
473 : | BitstreamSkip(bs, TMNMVtab2[index].len); | ||
474 : | return TMNMVtab2[index].code; | ||
475 : | edgomez | 78 | |
476 : | Isibaar | 3 | } |
477 : | |||
478 : | int get_mv(Bitstream * bs, int fcode) | ||
479 : | { | ||
480 : | edgomez | 78 | |
481 : | Isibaar | 3 | int data; |
482 : | int res; | ||
483 : | int mv; | ||
484 : | int scale_fac = 1 << (fcode - 1); | ||
485 : | |||
486 : | data = get_mv_data(bs); | ||
487 : | |||
488 : | if(scale_fac == 1 || data == 0) | ||
489 : | return data; | ||
490 : | |||
491 : | res = BitstreamGetBits(bs, fcode - 1); | ||
492 : | mv = ((ABS(data) - 1) * scale_fac) + res + 1; | ||
493 : | |||
494 : | return data < 0 ? -mv : mv; | ||
495 : | edgomez | 78 | |
496 : | Isibaar | 3 | } |
497 : | |||
498 : | int get_dc_dif(Bitstream * bs, uint32_t dc_size) | ||
499 : | { | ||
500 : | edgomez | 78 | |
501 : | Isibaar | 3 | int code = BitstreamGetBits(bs, dc_size); |
502 : | int msb = code >> (dc_size - 1); | ||
503 : | |||
504 : | if(msb == 0) | ||
505 : | return (-1 * (code^((1 << dc_size) - 1))); | ||
506 : | |||
507 : | return code; | ||
508 : | edgomez | 78 | |
509 : | Isibaar | 3 | } |
510 : | |||
511 : | int get_dc_size_lum(Bitstream * bs) | ||
512 : | { | ||
513 : | edgomez | 78 | |
514 : | Isibaar | 3 | int code, i; |
515 : | code = BitstreamShowBits(bs, 11); | ||
516 : | |||
517 : | for(i = 11; i > 3; i--) { | ||
518 : | if(code == 1) { | ||
519 : | BitstreamSkip(bs, i); | ||
520 : | return i + 1; | ||
521 : | } | ||
522 : | code >>= 1; | ||
523 : | } | ||
524 : | |||
525 : | BitstreamSkip(bs, dc_lum_tab[code].len); | ||
526 : | return dc_lum_tab[code].code; | ||
527 : | edgomez | 78 | |
528 : | Isibaar | 3 | } |
529 : | |||
530 : | |||
531 : | int get_dc_size_chrom(Bitstream * bs) | ||
532 : | { | ||
533 : | edgomez | 78 | |
534 : | Isibaar | 3 | uint32_t code, i; |
535 : | code = BitstreamShowBits(bs, 12); | ||
536 : | |||
537 : | for(i = 12; i > 2; i--) { | ||
538 : | if(code == 1) { | ||
539 : | BitstreamSkip(bs, i); | ||
540 : | return i; | ||
541 : | } | ||
542 : | code >>= 1; | ||
543 : | } | ||
544 : | |||
545 : | return 3 - BitstreamGetBits(bs, 2); | ||
546 : | edgomez | 78 | |
547 : | Isibaar | 3 | } |
548 : | |||
549 : | int get_coeff(Bitstream * bs, int *run, int *last, int intra, int short_video_header) | ||
550 : | { | ||
551 : | edgomez | 78 | |
552 : | uint32_t mode; | ||
553 : | const VLC *tab; | ||
554 : | Isibaar | 3 | int32_t level; |
555 : | |||
556 : | if(short_video_header) // inter-VLCs will be used for both intra and inter blocks | ||
557 : | intra = 0; | ||
558 : | |||
559 : | tab = &DCT3D[intra][BitstreamShowBits(bs, 12)]; | ||
560 : | |||
561 : | if(tab->code == -1) | ||
562 : | goto error; | ||
563 : | |||
564 : | BitstreamSkip(bs, tab->len); | ||
565 : | |||
566 : | if(tab->code != ESCAPE) { | ||
567 : | if(!intra) | ||
568 : | { | ||
569 : | *run = (tab->code >> 4) & 255; | ||
570 : | level = tab->code & 15; | ||
571 : | *last = (tab->code >> 12) & 1; | ||
572 : | } | ||
573 : | edgomez | 78 | else |
574 : | Isibaar | 3 | { |
575 : | *run = (tab->code >> 8) & 255; | ||
576 : | level = tab->code & 255; | ||
577 : | *last = (tab->code >> 16) & 1; | ||
578 : | } | ||
579 : | return BitstreamGetBit(bs) ? -level : level; | ||
580 : | } | ||
581 : | |||
582 : | if(short_video_header) | ||
583 : | { | ||
584 : | // escape mode 4 - H.263 type, only used if short_video_header = 1 | ||
585 : | *last = BitstreamGetBit(bs); | ||
586 : | *run = BitstreamGetBits(bs, 6); | ||
587 : | level = BitstreamGetBits(bs, 8); | ||
588 : | |||
589 : | if (level == 0 || level == 128) | ||
590 : | DEBUG1("Illegal LEVEL for ESCAPE mode 4:", level); | ||
591 : | |||
592 : | return (level >= 128 ? -(256 - level) : level); | ||
593 : | } | ||
594 : | |||
595 : | mode = BitstreamShowBits(bs, 2); | ||
596 : | |||
597 : | if(mode < 3) { | ||
598 : | BitstreamSkip(bs, (mode == 2) ? 2 : 1); | ||
599 : | |||
600 : | tab = &DCT3D[intra][BitstreamShowBits(bs, 12)]; | ||
601 : | if (tab->code == -1) | ||
602 : | goto error; | ||
603 : | |||
604 : | BitstreamSkip(bs, tab->len); | ||
605 : | |||
606 : | if (!intra) { | ||
607 : | *run = (tab->code >> 4) & 255; | ||
608 : | level = tab->code & 15; | ||
609 : | *last = (tab->code >> 12) & 1; | ||
610 : | } | ||
611 : | else | ||
612 : | { | ||
613 : | *run = (tab->code >> 8) & 255; | ||
614 : | level = tab->code & 255; | ||
615 : | *last = (tab->code >> 16) & 1; | ||
616 : | } | ||
617 : | |||
618 : | if(mode < 2) // first escape mode, level is offset | ||
619 : | level += max_level[*last + (!intra<<1)][*run]; // need to add back the max level | ||
620 : | else if(mode == 2) // second escape mode, run is offset | ||
621 : | *run += max_run[*last + (!intra<<1)][level] + 1; | ||
622 : | |||
623 : | return BitstreamGetBit(bs) ? -level : level; | ||
624 : | } | ||
625 : | |||
626 : | // third escape mode - fixed length codes | ||
627 : | BitstreamSkip(bs, 2); | ||
628 : | *last = BitstreamGetBits(bs, 1); | ||
629 : | *run = BitstreamGetBits(bs, 6); | ||
630 : | BitstreamSkip(bs, 1); // marker | ||
631 : | level = BitstreamGetBits(bs, 12); | ||
632 : | BitstreamSkip(bs, 1); // marker | ||
633 : | |||
634 : | return (level & 0x800) ? (level | (-1 ^ 0xfff)) : level; | ||
635 : | |||
636 : | edgomez | 78 | error: |
637 : | Isibaar | 3 | *run = VLC_ERROR; |
638 : | return 0; | ||
639 : | edgomez | 78 | |
640 : | Isibaar | 3 | } |
641 : | |||
642 : | |||
643 : | void get_intra_block(Bitstream * bs, int16_t * block, int direction, int coeff) | ||
644 : | { | ||
645 : | edgomez | 78 | |
646 : | Isibaar | 3 | const uint16_t * scan = scan_tables[ direction ]; |
647 : | int level; | ||
648 : | int run; | ||
649 : | int last; | ||
650 : | |||
651 : | do | ||
652 : | { | ||
653 : | level = get_coeff(bs, &run, &last, 1, 0); | ||
654 : | if (run == -1) | ||
655 : | { | ||
656 : | DEBUG("fatal: invalid run"); | ||
657 : | break; | ||
658 : | } | ||
659 : | coeff += run; | ||
660 : | block[ scan[coeff] ] = level; | ||
661 : | if (level < -127 || level > 127) | ||
662 : | { | ||
663 : | DEBUG1("warning: intra_overflow", level); | ||
664 : | } | ||
665 : | coeff++; | ||
666 : | } while (!last); | ||
667 : | edgomez | 78 | |
668 : | Isibaar | 3 | } |
669 : | |||
670 : | void get_inter_block(Bitstream * bs, int16_t * block) | ||
671 : | { | ||
672 : | edgomez | 78 | |
673 : | Isibaar | 3 | const uint16_t * scan = scan_tables[0]; |
674 : | int p; | ||
675 : | int level; | ||
676 : | int run; | ||
677 : | int last; | ||
678 : | |||
679 : | p = 0; | ||
680 : | do | ||
681 : | { | ||
682 : | level = get_coeff(bs, &run, &last, 0, 0); | ||
683 : | if (run == -1) | ||
684 : | { | ||
685 : | DEBUG("fatal: invalid run"); | ||
686 : | break; | ||
687 : | } | ||
688 : | p += run; | ||
689 : | block[ scan[p] ] = level; | ||
690 : | if (level < -127 || level > 127) | ||
691 : | { | ||
692 : | DEBUG1("warning: inter_overflow", level); | ||
693 : | } | ||
694 : | p++; | ||
695 : | } while (!last); | ||
696 : | edgomez | 78 | |
697 : | Isibaar | 3 | } |
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