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Original Path: trunk/xvidcore/src/bitstream/mbcoding.c
1 : | Isibaar | 3 | #include "../portab.h" |
2 : | #include "bitstream.h" | ||
3 : | #include "zigzag.h" | ||
4 : | #include "vlc_codes.h" | ||
5 : | |||
6 : | #include "../utils/mbfunctions.h" | ||
7 : | |||
8 : | edgomez | 17 | #include <stdlib.h> /* malloc, free */ |
9 : | |||
10 : | Isibaar | 3 | #define ESCAPE 7167 |
11 : | #define ABS(X) (((X)>0)?(X):-(X)) | ||
12 : | #define CLIP(X,A) (X > A) ? (A) : (X) | ||
13 : | |||
14 : | static VLC *DCT3D[2]; | ||
15 : | |||
16 : | VLC *intra_table, *inter_table; | ||
17 : | static short clip_table[4096]; | ||
18 : | |||
19 : | void create_vlc_tables(void) | ||
20 : | { | ||
21 : | edgomez | 78 | |
22 : | Isibaar | 3 | int32_t k, l, i, intra, last; |
23 : | VLC *vlc[2]; | ||
24 : | VLC **coeff_ptr; | ||
25 : | VLC *vlc1, *vlc2; | ||
26 : | |||
27 : | VLC *DCT3Dintra; | ||
28 : | VLC *DCT3Dinter; | ||
29 : | |||
30 : | DCT3Dintra = (VLC *) malloc(sizeof(VLC) * 4096); | ||
31 : | DCT3Dinter = (VLC *) malloc(sizeof(VLC) * 4096); | ||
32 : | |||
33 : | vlc1 = DCT3Dintra; | ||
34 : | vlc2 = DCT3Dinter; | ||
35 : | |||
36 : | vlc[0] = intra_table = (VLC *) malloc(128 * 511 * sizeof(VLC)); | ||
37 : | vlc[1] = inter_table = (VLC *) malloc(128 * 511 * sizeof(VLC)); | ||
38 : | |||
39 : | // initialize the clipping table | ||
40 : | for(i = -2048; i < 2048; i++) { | ||
41 : | clip_table[i + 2048] = i; | ||
42 : | if(i < -255) | ||
43 : | clip_table[i + 2048] = -255; | ||
44 : | if(i > 255) | ||
45 : | clip_table[i + 2048] = 255; | ||
46 : | } | ||
47 : | |||
48 : | // generate intra/inter vlc lookup table | ||
49 : | for(i = 0; i < 4; i++) { | ||
50 : | intra = i % 2; | ||
51 : | last = i >> 1; | ||
52 : | |||
53 : | coeff_ptr = coeff_vlc[last + (intra << 1)]; | ||
54 : | |||
55 : | for(k = -255; k < 256; k++) { // level | ||
56 : | char *max_level_ptr = max_level[last + (intra << 1)]; | ||
57 : | char *max_run_ptr = max_run[last + (intra << 1)]; | ||
58 : | |||
59 : | for(l = 0; l < 64; l++) { // run | ||
60 : | Isibaar | 35 | int32_t level = k; |
61 : | uint32_t run = l; | ||
62 : | Isibaar | 3 | |
63 : | if(abs(level) <= max_level_ptr[run] && run <= max_run_ptr[abs(level)]) { | ||
64 : | |||
65 : | if(level > 0) { | ||
66 : | vlc[intra]->code = (coeff_ptr[run][level - 1].code) << 1; | ||
67 : | vlc[intra]->len = coeff_ptr[run][level - 1].len + 1; | ||
68 : | } | ||
69 : | else if(level < 0) { | ||
70 : | vlc[intra]->code = ((coeff_ptr[run][-level - 1].code) << 1) + 1; | ||
71 : | vlc[intra]->len = coeff_ptr[run][-level - 1].len + 1; | ||
72 : | } | ||
73 : | else { | ||
74 : | vlc[intra]->code = 0; | ||
75 : | vlc[intra]->len = 0; | ||
76 : | } | ||
77 : | } else { | ||
78 : | if(level > 0) | ||
79 : | level -= max_level_ptr[run]; | ||
80 : | else | ||
81 : | level += max_level_ptr[run]; | ||
82 : | |||
83 : | if(abs(level) <= max_level_ptr[run] && | ||
84 : | run <= max_run_ptr[abs(level)]) { | ||
85 : | |||
86 : | if(level > 0) { | ||
87 : | vlc[intra]->code = (0x06 << (coeff_ptr[run][level - 1].len + 1)) | | ||
88 : | (coeff_ptr[run][level - 1].code << 1); | ||
89 : | vlc[intra]->len = (coeff_ptr[run][level - 1].len + 1) + 8; | ||
90 : | } | ||
91 : | else if(level < 0) { | ||
92 : | vlc[intra]->code = (0x06 << (coeff_ptr[run][-level - 1].len + 1)) | | ||
93 : | ((coeff_ptr[run][-level - 1].code << 1) + 1); | ||
94 : | vlc[intra]->len = (coeff_ptr[run][-level - 1].len + 1) + 8; | ||
95 : | } | ||
96 : | else { | ||
97 : | vlc[intra]->code = 0x06; | ||
98 : | vlc[intra]->len = 8; | ||
99 : | } | ||
100 : | } else { | ||
101 : | if(level > 0) | ||
102 : | level += max_level_ptr[run]; | ||
103 : | else | ||
104 : | level -= max_level_ptr[run]; | ||
105 : | Isibaar | 35 | |
106 : | Isibaar | 3 | run -= max_run_ptr[abs(level)] + 1; |
107 : | Isibaar | 28 | |
108 : | Isibaar | 3 | if(abs(level) <= max_level_ptr[run] && |
109 : | run <= max_run_ptr[abs(level)]) { | ||
110 : | |||
111 : | if(level > 0) { | ||
112 : | vlc[intra]->code = (0x0e << (coeff_ptr[run][level - 1].len + 1)) | | ||
113 : | (coeff_ptr[run][level - 1].code << 1); | ||
114 : | vlc[intra]->len = (coeff_ptr[run][level - 1].len + 1) + 9; | ||
115 : | } | ||
116 : | else if(level < 0) { | ||
117 : | vlc[intra]->code = (0x0e << (coeff_ptr[run][-level - 1].len + 1)) | | ||
118 : | ((coeff_ptr[run][-level - 1].code << 1) + 1); | ||
119 : | vlc[intra]->len = (coeff_ptr[run][-level - 1].len + 1) + 9; | ||
120 : | } | ||
121 : | else { | ||
122 : | vlc[intra]->code = 0x0e; | ||
123 : | vlc[intra]->len = 9; | ||
124 : | } | ||
125 : | } else { | ||
126 : | if(level != 0) | ||
127 : | run += max_run_ptr[abs(level)] + 1; | ||
128 : | else | ||
129 : | run++; | ||
130 : | |||
131 : | vlc[intra]->code = (uint32_t) ((0x1e + last) << 20) | | ||
132 : | (l << 14) | (1 << 13) | ((k & 0xfff) << 1) | 1; | ||
133 : | |||
134 : | vlc[intra]->len = 30; | ||
135 : | } | ||
136 : | } | ||
137 : | } | ||
138 : | vlc[intra]++; | ||
139 : | } | ||
140 : | } | ||
141 : | } | ||
142 : | edgomez | 78 | |
143 : | Isibaar | 3 | intra_table += 64*255; // center vlc tables |
144 : | inter_table += 64*255; // center vlc tables | ||
145 : | |||
146 : | for(i = 0; i < 4096; i++) { | ||
147 : | if(i >= 512) { | ||
148 : | *vlc1 = DCT3Dtab3[(i >> 5) - 16]; | ||
149 : | *vlc2 = DCT3Dtab0[(i >> 5) - 16]; | ||
150 : | } | ||
151 : | else if(i >= 128) { | ||
152 : | *vlc1 = DCT3Dtab4[(i >> 2) - 32]; | ||
153 : | *vlc2 = DCT3Dtab1[(i >> 2) - 32]; | ||
154 : | } | ||
155 : | else if(i >= 8) { | ||
156 : | *vlc1 = DCT3Dtab5[i - 8]; | ||
157 : | *vlc2 = DCT3Dtab2[i - 8]; | ||
158 : | } | ||
159 : | else { | ||
160 : | *vlc1 = ERRtab[i]; | ||
161 : | *vlc2 = ERRtab[i]; | ||
162 : | } | ||
163 : | |||
164 : | vlc1++; | ||
165 : | vlc2++; | ||
166 : | } | ||
167 : | DCT3D[0] = DCT3Dinter; | ||
168 : | DCT3D[1] = DCT3Dintra; | ||
169 : | |||
170 : | } | ||
171 : | |||
172 : | void destroy_vlc_tables(void) { | ||
173 : | |||
174 : | if(intra_table != NULL && inter_table != NULL) { | ||
175 : | intra_table -= 64*255; // uncenter vlc tables | ||
176 : | inter_table -= 64*255; // uncenter vlc tables | ||
177 : | |||
178 : | free(intra_table); | ||
179 : | free(inter_table); | ||
180 : | } | ||
181 : | |||
182 : | if(DCT3D[0] != NULL && DCT3D[1] != NULL) { | ||
183 : | free(DCT3D[0]); | ||
184 : | free(DCT3D[1]); | ||
185 : | } | ||
186 : | |||
187 : | } | ||
188 : | |||
189 : | edgomez | 78 | static __inline void CodeVector(Bitstream *bs, |
190 : | int16_t value, | ||
191 : | int16_t f_code, | ||
192 : | Statistics *pStat) | ||
193 : | Isibaar | 3 | { |
194 : | edgomez | 78 | |
195 : | Isibaar | 3 | const int scale_factor = 1 << (f_code - 1); |
196 : | const int cmp = scale_factor << 5; | ||
197 : | |||
198 : | if(value < (-1 * cmp)) | ||
199 : | value += 64 * scale_factor; | ||
200 : | |||
201 : | if(value > (cmp - 1)) | ||
202 : | value -= 64 * scale_factor; | ||
203 : | |||
204 : | edgomez | 78 | pStat->iMvSum += value * value; |
205 : | pStat->iMvCount++; | ||
206 : | Isibaar | 3 | |
207 : | edgomez | 78 | if (value == 0) { |
208 : | Isibaar | 3 | BitstreamPutBits(bs, mb_motion_table[32].code, mb_motion_table[32].len); |
209 : | edgomez | 78 | } else { |
210 : | Isibaar | 3 | uint16_t length, code, mv_res, sign; |
211 : | |||
212 : | length = 16 << f_code; | ||
213 : | f_code--; | ||
214 : | |||
215 : | sign = (value < 0); | ||
216 : | |||
217 : | if(value >= length) | ||
218 : | value -= 2 * length; | ||
219 : | else if(value < -length) | ||
220 : | value += 2 * length; | ||
221 : | |||
222 : | if(sign) | ||
223 : | value = -value; | ||
224 : | |||
225 : | value--; | ||
226 : | mv_res = value & ((1 << f_code) - 1); | ||
227 : | code = ((value - mv_res) >> f_code) + 1; | ||
228 : | |||
229 : | if(sign) | ||
230 : | code = -code; | ||
231 : | |||
232 : | code += 32; | ||
233 : | BitstreamPutBits(bs, mb_motion_table[code].code, mb_motion_table[code].len); | ||
234 : | |||
235 : | if(f_code) | ||
236 : | BitstreamPutBits(bs, mv_res, f_code); | ||
237 : | edgomez | 78 | } |
238 : | |||
239 : | Isibaar | 3 | } |
240 : | |||
241 : | |||
242 : | edgomez | 78 | static __inline void CodeCoeff(Bitstream *bs, |
243 : | int16_t qcoeff[64], | ||
244 : | VLC *table, | ||
245 : | const uint16_t *zigzag, | ||
246 : | uint16_t intra) | ||
247 : | { | ||
248 : | |||
249 : | Isibaar | 3 | uint32_t j, last; |
250 : | short v; | ||
251 : | VLC *vlc; | ||
252 : | |||
253 : | j = intra; | ||
254 : | last = 1 + intra; | ||
255 : | |||
256 : | while((v = qcoeff[zigzag[j++]]) == 0); | ||
257 : | |||
258 : | do { | ||
259 : | // count zeroes | ||
260 : | vlc = table + (clip_table[2048+v] << 6) + j - last; | ||
261 : | last = j + 1; | ||
262 : | while(j < 64 && (v = qcoeff[zigzag[j++]]) == 0); | ||
263 : | |||
264 : | // write code | ||
265 : | if(j != 64) { | ||
266 : | BitstreamPutBits(bs, vlc->code, vlc->len); | ||
267 : | } else { | ||
268 : | vlc += 64*511; | ||
269 : | BitstreamPutBits(bs, vlc->code, vlc->len); | ||
270 : | break; | ||
271 : | } | ||
272 : | } while(1); | ||
273 : | edgomez | 78 | |
274 : | Isibaar | 3 | } |
275 : | |||
276 : | |||
277 : | edgomez | 78 | static void CodeBlockIntra(const MBParam * pParam, |
278 : | const MACROBLOCK *pMB, | ||
279 : | int16_t qcoeff[6*64], | ||
280 : | Bitstream * bs, | ||
281 : | Statistics * pStat) | ||
282 : | Isibaar | 3 | { |
283 : | edgomez | 78 | |
284 : | Isibaar | 3 | uint32_t i, mcbpc, cbpy, bits; |
285 : | |||
286 : | cbpy = pMB->cbp >> 2; | ||
287 : | |||
288 : | edgomez | 78 | // write mcbpc |
289 : | Isibaar | 28 | if(pParam->coding_type == I_VOP) { |
290 : | edgomez | 78 | mcbpc = ((pMB->mode >> 1) & 3) | ((pMB->cbp & 3) << 2); |
291 : | Isibaar | 28 | BitstreamPutBits(bs, mcbpc_intra_tab[mcbpc].code, mcbpc_intra_tab[mcbpc].len); |
292 : | } | ||
293 : | else { | ||
294 : | edgomez | 78 | mcbpc = (pMB->mode & 7) | ((pMB->cbp & 3) << 3); |
295 : | Isibaar | 28 | BitstreamPutBits(bs, mcbpc_inter_tab[mcbpc].code, mcbpc_inter_tab[mcbpc].len); |
296 : | } | ||
297 : | Isibaar | 3 | |
298 : | // ac prediction flag | ||
299 : | if(pMB->acpred_directions[0]) | ||
300 : | edgomez | 78 | BitstreamPutBits(bs, 1, 1); |
301 : | Isibaar | 3 | else |
302 : | edgomez | 78 | BitstreamPutBits(bs, 0, 1); |
303 : | Isibaar | 3 | |
304 : | edgomez | 78 | // write cbpy |
305 : | Isibaar | 3 | BitstreamPutBits (bs, cbpy_tab[cbpy].code, cbpy_tab[cbpy].len); |
306 : | |||
307 : | // write dquant | ||
308 : | edgomez | 78 | if(pMB->mode == MODE_INTRA_Q) |
309 : | Isibaar | 3 | BitstreamPutBits(bs, pMB->dquant, 2); |
310 : | |||
311 : | h | 69 | // write interlacing |
312 : | if (pParam->global_flags & XVID_INTERLACING) | ||
313 : | { | ||
314 : | BitstreamPutBit(bs, pMB->field_dct); | ||
315 : | } | ||
316 : | |||
317 : | Isibaar | 3 | // code block coeffs |
318 : | for(i = 0; i < 6; i++) | ||
319 : | { | ||
320 : | if(i < 4) | ||
321 : | edgomez | 78 | BitstreamPutBits(bs, |
322 : | dcy_tab[qcoeff[i*64 + 0] + 255].code, | ||
323 : | dcy_tab[qcoeff[i*64 + 0] + 255].len); | ||
324 : | Isibaar | 3 | else |
325 : | edgomez | 78 | BitstreamPutBits(bs, |
326 : | dcc_tab[qcoeff[i*64 + 0] + 255].code, | ||
327 : | dcc_tab[qcoeff[i*64 + 0] + 255].len); | ||
328 : | Isibaar | 3 | |
329 : | if(pMB->cbp & (1 << (5 - i))) | ||
330 : | { | ||
331 : | bits = BitstreamPos(bs); | ||
332 : | |||
333 : | edgomez | 78 | CodeCoeff(bs, |
334 : | &qcoeff[i*64], | ||
335 : | intra_table, | ||
336 : | scan_tables[pMB->acpred_directions[i]], | ||
337 : | 1); | ||
338 : | Isibaar | 3 | |
339 : | bits = BitstreamPos(bs) - bits; | ||
340 : | pStat->iTextBits += bits; | ||
341 : | } | ||
342 : | } | ||
343 : | edgomez | 78 | |
344 : | Isibaar | 3 | } |
345 : | |||
346 : | |||
347 : | edgomez | 78 | static void CodeBlockInter(const MBParam * pParam, |
348 : | const MACROBLOCK *pMB, | ||
349 : | int16_t qcoeff[6*64], | ||
350 : | Bitstream * bs, | ||
351 : | Statistics * pStat) | ||
352 : | Isibaar | 3 | { |
353 : | edgomez | 78 | |
354 : | Isibaar | 3 | int32_t i; |
355 : | uint32_t bits, mcbpc, cbpy; | ||
356 : | |||
357 : | edgomez | 78 | mcbpc = (pMB->mode & 7) | ((pMB->cbp & 3) << 3); |
358 : | Isibaar | 3 | cbpy = 15 - (pMB->cbp >> 2); |
359 : | |||
360 : | // write mcbpc | ||
361 : | edgomez | 78 | BitstreamPutBits(bs, mcbpc_inter_tab[mcbpc].code, mcbpc_inter_tab[mcbpc].len); |
362 : | Isibaar | 3 | |
363 : | // write cbpy | ||
364 : | BitstreamPutBits(bs, cbpy_tab[cbpy].code, cbpy_tab[cbpy].len); | ||
365 : | |||
366 : | // write dquant | ||
367 : | edgomez | 78 | if(pMB->mode == MODE_INTER_Q) |
368 : | Isibaar | 3 | BitstreamPutBits(bs, pMB->dquant, 2); |
369 : | |||
370 : | h | 69 | // interlacing |
371 : | if (pParam->global_flags & XVID_INTERLACING) | ||
372 : | { | ||
373 : | BitstreamPutBit(bs, pMB->field_dct); | ||
374 : | DEBUG1("codep: field_dct: ", pMB->field_dct); | ||
375 : | |||
376 : | // if inter block, write field ME flag | ||
377 : | if (pMB->mode == MODE_INTER || pMB->mode == MODE_INTER_Q) | ||
378 : | { | ||
379 : | BitstreamPutBit(bs, pMB->field_pred); | ||
380 : | DEBUG1("codep: field_pred: ", pMB->field_pred); | ||
381 : | |||
382 : | // write field prediction references | ||
383 : | if (pMB->field_pred) | ||
384 : | { | ||
385 : | BitstreamPutBit(bs, pMB->field_for_top); | ||
386 : | BitstreamPutBit(bs, pMB->field_for_bot); | ||
387 : | } | ||
388 : | } | ||
389 : | } | ||
390 : | |||
391 : | Isibaar | 3 | // code motion vector(s) |
392 : | for(i = 0; i < (pMB->mode == MODE_INTER4V ? 4 : 1); i++) | ||
393 : | { | ||
394 : | CodeVector(bs, pMB->pmvs[i].x, pParam->fixed_code, pStat); | ||
395 : | CodeVector(bs, pMB->pmvs[i].y, pParam->fixed_code, pStat); | ||
396 : | } | ||
397 : | |||
398 : | bits = BitstreamPos(bs); | ||
399 : | |||
400 : | // code block coeffs | ||
401 : | for(i = 0; i < 6; i++) | ||
402 : | if(pMB->cbp & (1 << (5 - i))) | ||
403 : | edgomez | 78 | CodeCoeff(bs, &qcoeff[i*64], inter_table, scan_tables[0], 0); |
404 : | Isibaar | 3 | |
405 : | bits = BitstreamPos(bs) - bits; | ||
406 : | pStat->iTextBits += bits; | ||
407 : | edgomez | 78 | |
408 : | Isibaar | 3 | } |
409 : | |||
410 : | |||
411 : | edgomez | 78 | void MBCoding(const MBParam * pParam, |
412 : | MACROBLOCK *pMB, | ||
413 : | int16_t qcoeff[6*64], | ||
414 : | Bitstream * bs, | ||
415 : | Statistics * pStat) | ||
416 : | Isibaar | 3 | { |
417 : | edgomez | 78 | |
418 : | Isibaar | 3 | int intra = (pMB->mode == MODE_INTRA || pMB->mode == MODE_INTRA_Q); |
419 : | |||
420 : | edgomez | 78 | if(pParam->coding_type == P_VOP) { |
421 : | Isibaar | 3 | if(pMB->cbp == 0 && pMB->mode == MODE_INTER && |
422 : | edgomez | 78 | pMB->mvs[0].x == 0 && pMB->mvs[0].y == 0) |
423 : | Isibaar | 3 | { |
424 : | BitstreamPutBit(bs, 1); // not_coded | ||
425 : | return; | ||
426 : | } | ||
427 : | else | ||
428 : | BitstreamPutBit(bs, 0); // coded | ||
429 : | } | ||
430 : | |||
431 : | if(intra) | ||
432 : | CodeBlockIntra(pParam, pMB, qcoeff, bs, pStat); | ||
433 : | else | ||
434 : | CodeBlockInter(pParam, pMB, qcoeff, bs, pStat); | ||
435 : | edgomez | 78 | |
436 : | Isibaar | 3 | } |
437 : | |||
438 : | |||
439 : | /*************************************************************** | ||
440 : | edgomez | 15 | * decoding stuff starts here * |
441 : | ***************************************************************/ | ||
442 : | Isibaar | 3 | |
443 : | int get_mcbpc_intra(Bitstream * bs) | ||
444 : | { | ||
445 : | edgomez | 78 | |
446 : | Isibaar | 3 | uint32_t index; |
447 : | |||
448 : | while((index = BitstreamShowBits(bs, 9)) == 1) | ||
449 : | BitstreamSkip(bs, 9); | ||
450 : | |||
451 : | index >>= 3; | ||
452 : | |||
453 : | BitstreamSkip(bs, mcbpc_intra_table[index].len); | ||
454 : | edgomez | 78 | |
455 : | Isibaar | 3 | return mcbpc_intra_table[index].code; |
456 : | edgomez | 78 | |
457 : | Isibaar | 3 | } |
458 : | |||
459 : | int get_mcbpc_inter(Bitstream * bs) | ||
460 : | { | ||
461 : | edgomez | 78 | |
462 : | Isibaar | 3 | uint32_t index; |
463 : | |||
464 : | while((index = CLIP(BitstreamShowBits(bs, 9), 256)) == 1) | ||
465 : | BitstreamSkip(bs, 9); | ||
466 : | |||
467 : | edgomez | 78 | BitstreamSkip(bs, mcbpc_inter_table[index].len); |
468 : | |||
469 : | Isibaar | 3 | return mcbpc_inter_table[index].code; |
470 : | edgomez | 78 | |
471 : | Isibaar | 3 | } |
472 : | |||
473 : | int get_cbpy(Bitstream * bs, int intra) | ||
474 : | { | ||
475 : | edgomez | 78 | |
476 : | Isibaar | 3 | int cbpy; |
477 : | uint32_t index = BitstreamShowBits(bs, 6); | ||
478 : | |||
479 : | BitstreamSkip(bs, cbpy_table[index].len); | ||
480 : | cbpy = cbpy_table[index].code; | ||
481 : | |||
482 : | if(!intra) | ||
483 : | cbpy = 15 - cbpy; | ||
484 : | |||
485 : | return cbpy; | ||
486 : | edgomez | 78 | |
487 : | Isibaar | 3 | } |
488 : | |||
489 : | int get_mv_data(Bitstream * bs) | ||
490 : | { | ||
491 : | edgomez | 78 | |
492 : | Isibaar | 3 | uint32_t index; |
493 : | |||
494 : | if(BitstreamGetBit(bs)) | ||
495 : | return 0; | ||
496 : | |||
497 : | index = BitstreamShowBits(bs, 12); | ||
498 : | |||
499 : | if(index >= 512) | ||
500 : | { | ||
501 : | index = (index >> 8) - 2; | ||
502 : | BitstreamSkip(bs, TMNMVtab0[index].len); | ||
503 : | return TMNMVtab0[index].code; | ||
504 : | } | ||
505 : | |||
506 : | if(index >= 128) | ||
507 : | { | ||
508 : | index = (index >> 2) - 32; | ||
509 : | BitstreamSkip(bs, TMNMVtab1[index].len); | ||
510 : | return TMNMVtab1[index].code; | ||
511 : | } | ||
512 : | |||
513 : | index -= 4; | ||
514 : | |||
515 : | BitstreamSkip(bs, TMNMVtab2[index].len); | ||
516 : | return TMNMVtab2[index].code; | ||
517 : | edgomez | 78 | |
518 : | Isibaar | 3 | } |
519 : | |||
520 : | int get_mv(Bitstream * bs, int fcode) | ||
521 : | { | ||
522 : | edgomez | 78 | |
523 : | Isibaar | 3 | int data; |
524 : | int res; | ||
525 : | int mv; | ||
526 : | int scale_fac = 1 << (fcode - 1); | ||
527 : | |||
528 : | data = get_mv_data(bs); | ||
529 : | |||
530 : | if(scale_fac == 1 || data == 0) | ||
531 : | return data; | ||
532 : | |||
533 : | res = BitstreamGetBits(bs, fcode - 1); | ||
534 : | mv = ((ABS(data) - 1) * scale_fac) + res + 1; | ||
535 : | |||
536 : | return data < 0 ? -mv : mv; | ||
537 : | edgomez | 78 | |
538 : | Isibaar | 3 | } |
539 : | |||
540 : | int get_dc_dif(Bitstream * bs, uint32_t dc_size) | ||
541 : | { | ||
542 : | edgomez | 78 | |
543 : | Isibaar | 3 | int code = BitstreamGetBits(bs, dc_size); |
544 : | int msb = code >> (dc_size - 1); | ||
545 : | |||
546 : | if(msb == 0) | ||
547 : | return (-1 * (code^((1 << dc_size) - 1))); | ||
548 : | |||
549 : | return code; | ||
550 : | edgomez | 78 | |
551 : | Isibaar | 3 | } |
552 : | |||
553 : | int get_dc_size_lum(Bitstream * bs) | ||
554 : | { | ||
555 : | edgomez | 78 | |
556 : | Isibaar | 3 | int code, i; |
557 : | code = BitstreamShowBits(bs, 11); | ||
558 : | |||
559 : | for(i = 11; i > 3; i--) { | ||
560 : | if(code == 1) { | ||
561 : | BitstreamSkip(bs, i); | ||
562 : | return i + 1; | ||
563 : | } | ||
564 : | code >>= 1; | ||
565 : | } | ||
566 : | |||
567 : | BitstreamSkip(bs, dc_lum_tab[code].len); | ||
568 : | return dc_lum_tab[code].code; | ||
569 : | edgomez | 78 | |
570 : | Isibaar | 3 | } |
571 : | |||
572 : | |||
573 : | int get_dc_size_chrom(Bitstream * bs) | ||
574 : | { | ||
575 : | edgomez | 78 | |
576 : | Isibaar | 3 | uint32_t code, i; |
577 : | code = BitstreamShowBits(bs, 12); | ||
578 : | |||
579 : | for(i = 12; i > 2; i--) { | ||
580 : | if(code == 1) { | ||
581 : | BitstreamSkip(bs, i); | ||
582 : | return i; | ||
583 : | } | ||
584 : | code >>= 1; | ||
585 : | } | ||
586 : | |||
587 : | return 3 - BitstreamGetBits(bs, 2); | ||
588 : | edgomez | 78 | |
589 : | Isibaar | 3 | } |
590 : | |||
591 : | int get_coeff(Bitstream * bs, int *run, int *last, int intra, int short_video_header) | ||
592 : | { | ||
593 : | edgomez | 78 | |
594 : | uint32_t mode; | ||
595 : | const VLC *tab; | ||
596 : | Isibaar | 3 | int32_t level; |
597 : | |||
598 : | if(short_video_header) // inter-VLCs will be used for both intra and inter blocks | ||
599 : | intra = 0; | ||
600 : | |||
601 : | tab = &DCT3D[intra][BitstreamShowBits(bs, 12)]; | ||
602 : | |||
603 : | if(tab->code == -1) | ||
604 : | goto error; | ||
605 : | |||
606 : | BitstreamSkip(bs, tab->len); | ||
607 : | |||
608 : | if(tab->code != ESCAPE) { | ||
609 : | if(!intra) | ||
610 : | { | ||
611 : | *run = (tab->code >> 4) & 255; | ||
612 : | level = tab->code & 15; | ||
613 : | *last = (tab->code >> 12) & 1; | ||
614 : | } | ||
615 : | edgomez | 78 | else |
616 : | Isibaar | 3 | { |
617 : | *run = (tab->code >> 8) & 255; | ||
618 : | level = tab->code & 255; | ||
619 : | *last = (tab->code >> 16) & 1; | ||
620 : | } | ||
621 : | return BitstreamGetBit(bs) ? -level : level; | ||
622 : | } | ||
623 : | |||
624 : | if(short_video_header) | ||
625 : | { | ||
626 : | // escape mode 4 - H.263 type, only used if short_video_header = 1 | ||
627 : | *last = BitstreamGetBit(bs); | ||
628 : | *run = BitstreamGetBits(bs, 6); | ||
629 : | level = BitstreamGetBits(bs, 8); | ||
630 : | |||
631 : | if (level == 0 || level == 128) | ||
632 : | DEBUG1("Illegal LEVEL for ESCAPE mode 4:", level); | ||
633 : | |||
634 : | return (level >= 128 ? -(256 - level) : level); | ||
635 : | } | ||
636 : | |||
637 : | mode = BitstreamShowBits(bs, 2); | ||
638 : | |||
639 : | if(mode < 3) { | ||
640 : | BitstreamSkip(bs, (mode == 2) ? 2 : 1); | ||
641 : | |||
642 : | tab = &DCT3D[intra][BitstreamShowBits(bs, 12)]; | ||
643 : | if (tab->code == -1) | ||
644 : | goto error; | ||
645 : | |||
646 : | BitstreamSkip(bs, tab->len); | ||
647 : | |||
648 : | if (!intra) { | ||
649 : | *run = (tab->code >> 4) & 255; | ||
650 : | level = tab->code & 15; | ||
651 : | *last = (tab->code >> 12) & 1; | ||
652 : | } | ||
653 : | else | ||
654 : | { | ||
655 : | *run = (tab->code >> 8) & 255; | ||
656 : | level = tab->code & 255; | ||
657 : | *last = (tab->code >> 16) & 1; | ||
658 : | } | ||
659 : | |||
660 : | if(mode < 2) // first escape mode, level is offset | ||
661 : | level += max_level[*last + (!intra<<1)][*run]; // need to add back the max level | ||
662 : | else if(mode == 2) // second escape mode, run is offset | ||
663 : | *run += max_run[*last + (!intra<<1)][level] + 1; | ||
664 : | |||
665 : | return BitstreamGetBit(bs) ? -level : level; | ||
666 : | } | ||
667 : | |||
668 : | // third escape mode - fixed length codes | ||
669 : | BitstreamSkip(bs, 2); | ||
670 : | *last = BitstreamGetBits(bs, 1); | ||
671 : | *run = BitstreamGetBits(bs, 6); | ||
672 : | BitstreamSkip(bs, 1); // marker | ||
673 : | level = BitstreamGetBits(bs, 12); | ||
674 : | BitstreamSkip(bs, 1); // marker | ||
675 : | |||
676 : | return (level & 0x800) ? (level | (-1 ^ 0xfff)) : level; | ||
677 : | |||
678 : | edgomez | 78 | error: |
679 : | Isibaar | 3 | *run = VLC_ERROR; |
680 : | return 0; | ||
681 : | edgomez | 78 | |
682 : | Isibaar | 3 | } |
683 : | |||
684 : | |||
685 : | void get_intra_block(Bitstream * bs, int16_t * block, int direction, int coeff) | ||
686 : | { | ||
687 : | edgomez | 78 | |
688 : | Isibaar | 3 | const uint16_t * scan = scan_tables[ direction ]; |
689 : | int level; | ||
690 : | int run; | ||
691 : | int last; | ||
692 : | |||
693 : | do | ||
694 : | { | ||
695 : | level = get_coeff(bs, &run, &last, 1, 0); | ||
696 : | if (run == -1) | ||
697 : | { | ||
698 : | DEBUG("fatal: invalid run"); | ||
699 : | break; | ||
700 : | } | ||
701 : | coeff += run; | ||
702 : | block[ scan[coeff] ] = level; | ||
703 : | if (level < -127 || level > 127) | ||
704 : | { | ||
705 : | DEBUG1("warning: intra_overflow", level); | ||
706 : | } | ||
707 : | coeff++; | ||
708 : | } while (!last); | ||
709 : | edgomez | 78 | |
710 : | Isibaar | 3 | } |
711 : | |||
712 : | void get_inter_block(Bitstream * bs, int16_t * block) | ||
713 : | { | ||
714 : | edgomez | 78 | |
715 : | Isibaar | 3 | const uint16_t * scan = scan_tables[0]; |
716 : | int p; | ||
717 : | int level; | ||
718 : | int run; | ||
719 : | int last; | ||
720 : | |||
721 : | p = 0; | ||
722 : | do | ||
723 : | { | ||
724 : | level = get_coeff(bs, &run, &last, 0, 0); | ||
725 : | if (run == -1) | ||
726 : | { | ||
727 : | DEBUG("fatal: invalid run"); | ||
728 : | break; | ||
729 : | } | ||
730 : | p += run; | ||
731 : | block[ scan[p] ] = level; | ||
732 : | if (level < -127 || level > 127) | ||
733 : | { | ||
734 : | DEBUG1("warning: inter_overflow", level); | ||
735 : | } | ||
736 : | p++; | ||
737 : | } while (!last); | ||
738 : | edgomez | 78 | |
739 : | Isibaar | 3 | } |
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