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Original Path: trunk/xvidcore/src/bitstream/mbcoding.c
1 : | suxen_drol | 118 | /****************************************************************************** |
2 : | * * | ||
3 : | * This file is part of XviD, a free MPEG-4 video encoder/decoder * | ||
4 : | * * | ||
5 : | * XviD is an implementation of a part of one or more MPEG-4 Video tools * | ||
6 : | * as specified in ISO/IEC 14496-2 standard. Those intending to use this * | ||
7 : | * software module in hardware or software products are advised that its * | ||
8 : | * use may infringe existing patents or copyrights, and any such use * | ||
9 : | * would be at such party's own risk. The original developer of this * | ||
10 : | * software module and his/her company, and subsequent editors and their * | ||
11 : | * companies, will have no liability for use of this software or * | ||
12 : | * modifications or derivatives thereof. * | ||
13 : | * * | ||
14 : | * XviD is free software; you can redistribute it and/or modify it * | ||
15 : | * under the terms of the GNU General Public License as published by * | ||
16 : | * the Free Software Foundation; either version 2 of the License, or * | ||
17 : | * (at your option) any later version. * | ||
18 : | * * | ||
19 : | * XviD is distributed in the hope that it will be useful, but * | ||
20 : | * WITHOUT ANY WARRANTY; without even the implied warranty of * | ||
21 : | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * | ||
22 : | * GNU General Public License for more details. * | ||
23 : | * * | ||
24 : | * You should have received a copy of the GNU General Public License * | ||
25 : | * along with this program; if not, write to the Free Software * | ||
26 : | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * | ||
27 : | * * | ||
28 : | ******************************************************************************/ | ||
29 : | |||
30 : | /****************************************************************************** | ||
31 : | * * | ||
32 : | * bitstream.c * | ||
33 : | * * | ||
34 : | * Copyright (C) 2001 - Peter Ross <pross@cs.rmit.edu.au> * | ||
35 : | * * | ||
36 : | * For more information visit the XviD homepage: http://www.xvid.org * | ||
37 : | * * | ||
38 : | ******************************************************************************/ | ||
39 : | |||
40 : | /****************************************************************************** | ||
41 : | * * | ||
42 : | * Revision history: * | ||
43 : | * * | ||
44 : | * 14.04.2002 bframe encoding | ||
45 : | * 08.03.2002 initial version; isibaar * | ||
46 : | * * | ||
47 : | ******************************************************************************/ | ||
48 : | |||
49 : | |||
50 : | |||
51 : | Isibaar | 100 | #include <stdlib.h> |
52 : | Isibaar | 3 | #include "../portab.h" |
53 : | #include "bitstream.h" | ||
54 : | #include "zigzag.h" | ||
55 : | #include "vlc_codes.h" | ||
56 : | Isibaar | 100 | #include "mbcoding.h" |
57 : | Isibaar | 3 | |
58 : | #include "../utils/mbfunctions.h" | ||
59 : | |||
60 : | #define ABS(X) (((X)>0)?(X):-(X)) | ||
61 : | #define CLIP(X,A) (X > A) ? (A) : (X) | ||
62 : | |||
63 : | Isibaar | 100 | VLC intra_table[65536]; |
64 : | VLC inter_table[65536]; | ||
65 : | |||
66 : | Isibaar | 114 | VLC DCT3Dintra[4096]; |
67 : | VLC DCT3Dinter[4096]; | ||
68 : | Isibaar | 3 | |
69 : | Isibaar | 114 | static int16_t clip_table[4096]; |
70 : | |||
71 : | Isibaar | 100 | void init_vlc_tables(void) |
72 : | Isibaar | 3 | { |
73 : | edgomez | 78 | |
74 : | Isibaar | 3 | int32_t k, l, i, intra, last; |
75 : | VLC *vlc[2]; | ||
76 : | VLC **coeff_ptr; | ||
77 : | VLC *vlc1, *vlc2; | ||
78 : | |||
79 : | vlc1 = DCT3Dintra; | ||
80 : | vlc2 = DCT3Dinter; | ||
81 : | |||
82 : | Isibaar | 100 | vlc[0] = intra_table; |
83 : | vlc[1] = inter_table; | ||
84 : | Isibaar | 3 | |
85 : | // initialize the clipping table | ||
86 : | for(i = -2048; i < 2048; i++) { | ||
87 : | clip_table[i + 2048] = i; | ||
88 : | if(i < -255) | ||
89 : | clip_table[i + 2048] = -255; | ||
90 : | if(i > 255) | ||
91 : | clip_table[i + 2048] = 255; | ||
92 : | } | ||
93 : | |||
94 : | Isibaar | 100 | // generate encoding vlc lookup tables |
95 : | Isibaar | 3 | for(i = 0; i < 4; i++) { |
96 : | intra = i % 2; | ||
97 : | Isibaar | 100 | last = i / 2; |
98 : | Isibaar | 3 | |
99 : | Isibaar | 100 | coeff_ptr = coeff_vlc[last + 2 * intra]; |
100 : | Isibaar | 3 | |
101 : | for(k = -255; k < 256; k++) { // level | ||
102 : | Isibaar | 100 | int8_t *max_level_ptr = max_level[last + 2 * intra]; |
103 : | int8_t *max_run_ptr = max_run[last + 2 * intra]; | ||
104 : | Isibaar | 3 | |
105 : | for(l = 0; l < 64; l++) { // run | ||
106 : | Isibaar | 35 | int32_t level = k; |
107 : | uint32_t run = l; | ||
108 : | Isibaar | 100 | |
109 : | if((abs(level) <= max_level_ptr[run]) && | ||
110 : | (run <= max_run_ptr[abs(level)])) { // level < max_level and run < max_run | ||
111 : | |||
112 : | Isibaar | 3 | vlc[intra]->code = 0; |
113 : | vlc[intra]->len = 0; | ||
114 : | Isibaar | 100 | goto loop_end; |
115 : | } | ||
116 : | else { | ||
117 : | if(level > 0) // correct level | ||
118 : | Isibaar | 3 | level -= max_level_ptr[run]; |
119 : | else | ||
120 : | level += max_level_ptr[run]; | ||
121 : | Isibaar | 35 | |
122 : | Isibaar | 100 | if((abs(level) <= max_level_ptr[run]) && |
123 : | (run <= max_run_ptr[abs(level)])) { | ||
124 : | Isibaar | 28 | |
125 : | Isibaar | 100 | vlc[intra]->code = 0x06; |
126 : | vlc[intra]->len = 8; | ||
127 : | goto loop_end; | ||
128 : | } | ||
129 : | Isibaar | 3 | |
130 : | Isibaar | 100 | if(level > 0) // still here? |
131 : | level += max_level_ptr[run]; // restore level | ||
132 : | else | ||
133 : | level -= max_level_ptr[run]; | ||
134 : | |||
135 : | run -= max_run_ptr[abs(level)] + 1; // and change run | ||
136 : | |||
137 : | if((abs(level) <= max_level_ptr[run]) && | ||
138 : | (run <= max_run_ptr[abs(level)])) { | ||
139 : | |||
140 : | vlc[intra]->code = 0x0e; | ||
141 : | vlc[intra]->len = 9; | ||
142 : | goto loop_end; | ||
143 : | Isibaar | 3 | } |
144 : | Isibaar | 100 | run += max_run_ptr[abs(level)] + 1; |
145 : | Isibaar | 3 | } |
146 : | Isibaar | 100 | |
147 : | vlc[intra]->code = (uint32_t) ((l << 14) | (0x1e + last) << 20) | | ||
148 : | (1 << 13) | ((k & 0xfff) << 1) | 1; | ||
149 : | |||
150 : | vlc[intra]->len = 30; | ||
151 : | Isibaar | 3 | vlc[intra]++; |
152 : | Isibaar | 100 | continue; |
153 : | |||
154 : | loop_end: | ||
155 : | if(level != 0) { | ||
156 : | vlc[intra]->code = (vlc[intra]->code << (coeff_ptr[run][abs(level) - 1].len + 1)) | | ||
157 : | (coeff_ptr[run][abs(level) - 1].code << 1); | ||
158 : | vlc[intra]->len = (coeff_ptr[run][abs(level) - 1].len + 1) + vlc[intra]->len; | ||
159 : | |||
160 : | if(level < 0) | ||
161 : | vlc[intra]->code += 1; | ||
162 : | } | ||
163 : | |||
164 : | vlc[intra]++; | ||
165 : | Isibaar | 3 | } |
166 : | } | ||
167 : | } | ||
168 : | edgomez | 78 | |
169 : | Isibaar | 3 | for(i = 0; i < 4096; i++) { |
170 : | if(i >= 512) { | ||
171 : | *vlc1 = DCT3Dtab3[(i >> 5) - 16]; | ||
172 : | *vlc2 = DCT3Dtab0[(i >> 5) - 16]; | ||
173 : | } | ||
174 : | else if(i >= 128) { | ||
175 : | *vlc1 = DCT3Dtab4[(i >> 2) - 32]; | ||
176 : | *vlc2 = DCT3Dtab1[(i >> 2) - 32]; | ||
177 : | } | ||
178 : | else if(i >= 8) { | ||
179 : | *vlc1 = DCT3Dtab5[i - 8]; | ||
180 : | *vlc2 = DCT3Dtab2[i - 8]; | ||
181 : | } | ||
182 : | else { | ||
183 : | *vlc1 = ERRtab[i]; | ||
184 : | *vlc2 = ERRtab[i]; | ||
185 : | } | ||
186 : | |||
187 : | vlc1++; | ||
188 : | vlc2++; | ||
189 : | } | ||
190 : | DCT3D[0] = DCT3Dinter; | ||
191 : | DCT3D[1] = DCT3Dintra; | ||
192 : | |||
193 : | } | ||
194 : | |||
195 : | edgomez | 78 | static __inline void CodeVector(Bitstream *bs, |
196 : | int16_t value, | ||
197 : | int16_t f_code, | ||
198 : | Statistics *pStat) | ||
199 : | Isibaar | 3 | { |
200 : | edgomez | 78 | |
201 : | Isibaar | 3 | const int scale_factor = 1 << (f_code - 1); |
202 : | const int cmp = scale_factor << 5; | ||
203 : | |||
204 : | if(value < (-1 * cmp)) | ||
205 : | value += 64 * scale_factor; | ||
206 : | |||
207 : | if(value > (cmp - 1)) | ||
208 : | value -= 64 * scale_factor; | ||
209 : | |||
210 : | edgomez | 78 | pStat->iMvSum += value * value; |
211 : | pStat->iMvCount++; | ||
212 : | Isibaar | 3 | |
213 : | edgomez | 78 | if (value == 0) { |
214 : | Isibaar | 3 | BitstreamPutBits(bs, mb_motion_table[32].code, mb_motion_table[32].len); |
215 : | edgomez | 78 | } else { |
216 : | Isibaar | 3 | uint16_t length, code, mv_res, sign; |
217 : | |||
218 : | length = 16 << f_code; | ||
219 : | f_code--; | ||
220 : | |||
221 : | sign = (value < 0); | ||
222 : | |||
223 : | if(value >= length) | ||
224 : | value -= 2 * length; | ||
225 : | else if(value < -length) | ||
226 : | value += 2 * length; | ||
227 : | |||
228 : | if(sign) | ||
229 : | value = -value; | ||
230 : | |||
231 : | value--; | ||
232 : | mv_res = value & ((1 << f_code) - 1); | ||
233 : | code = ((value - mv_res) >> f_code) + 1; | ||
234 : | |||
235 : | if(sign) | ||
236 : | code = -code; | ||
237 : | |||
238 : | code += 32; | ||
239 : | BitstreamPutBits(bs, mb_motion_table[code].code, mb_motion_table[code].len); | ||
240 : | |||
241 : | if(f_code) | ||
242 : | BitstreamPutBits(bs, mv_res, f_code); | ||
243 : | edgomez | 78 | } |
244 : | |||
245 : | Isibaar | 3 | } |
246 : | |||
247 : | |||
248 : | edgomez | 78 | static __inline void CodeCoeff(Bitstream *bs, |
249 : | int16_t qcoeff[64], | ||
250 : | VLC *table, | ||
251 : | const uint16_t *zigzag, | ||
252 : | uint16_t intra) | ||
253 : | { | ||
254 : | |||
255 : | Isibaar | 3 | uint32_t j, last; |
256 : | short v; | ||
257 : | VLC *vlc; | ||
258 : | |||
259 : | j = intra; | ||
260 : | Isibaar | 116 | last = intra; |
261 : | Isibaar | 3 | |
262 : | Isibaar | 116 | while((v = qcoeff[zigzag[j]]) == 0) j++; |
263 : | Isibaar | 3 | |
264 : | do { | ||
265 : | // count zeroes | ||
266 : | Isibaar | 100 | vlc = table + 64*255 + (clip_table[2048+v] << 6) + j - last; |
267 : | Isibaar | 116 | last = ++j; |
268 : | while(j < 64 && (v = qcoeff[zigzag[j]]) == 0) j++; | ||
269 : | Isibaar | 3 | |
270 : | // write code | ||
271 : | if(j != 64) { | ||
272 : | BitstreamPutBits(bs, vlc->code, vlc->len); | ||
273 : | } else { | ||
274 : | vlc += 64*511; | ||
275 : | BitstreamPutBits(bs, vlc->code, vlc->len); | ||
276 : | break; | ||
277 : | } | ||
278 : | } while(1); | ||
279 : | edgomez | 78 | |
280 : | Isibaar | 3 | } |
281 : | |||
282 : | |||
283 : | edgomez | 78 | static void CodeBlockIntra(const MBParam * pParam, |
284 : | const MACROBLOCK *pMB, | ||
285 : | int16_t qcoeff[6*64], | ||
286 : | Bitstream * bs, | ||
287 : | Statistics * pStat) | ||
288 : | Isibaar | 3 | { |
289 : | edgomez | 78 | |
290 : | Isibaar | 3 | uint32_t i, mcbpc, cbpy, bits; |
291 : | |||
292 : | cbpy = pMB->cbp >> 2; | ||
293 : | |||
294 : | edgomez | 78 | // write mcbpc |
295 : | Isibaar | 28 | if(pParam->coding_type == I_VOP) { |
296 : | edgomez | 78 | mcbpc = ((pMB->mode >> 1) & 3) | ((pMB->cbp & 3) << 2); |
297 : | Isibaar | 28 | BitstreamPutBits(bs, mcbpc_intra_tab[mcbpc].code, mcbpc_intra_tab[mcbpc].len); |
298 : | } | ||
299 : | else { | ||
300 : | edgomez | 78 | mcbpc = (pMB->mode & 7) | ((pMB->cbp & 3) << 3); |
301 : | Isibaar | 28 | BitstreamPutBits(bs, mcbpc_inter_tab[mcbpc].code, mcbpc_inter_tab[mcbpc].len); |
302 : | } | ||
303 : | Isibaar | 3 | |
304 : | // ac prediction flag | ||
305 : | if(pMB->acpred_directions[0]) | ||
306 : | edgomez | 78 | BitstreamPutBits(bs, 1, 1); |
307 : | Isibaar | 3 | else |
308 : | edgomez | 78 | BitstreamPutBits(bs, 0, 1); |
309 : | Isibaar | 3 | |
310 : | edgomez | 78 | // write cbpy |
311 : | Isibaar | 3 | BitstreamPutBits (bs, cbpy_tab[cbpy].code, cbpy_tab[cbpy].len); |
312 : | |||
313 : | // write dquant | ||
314 : | edgomez | 78 | if(pMB->mode == MODE_INTRA_Q) |
315 : | Isibaar | 3 | BitstreamPutBits(bs, pMB->dquant, 2); |
316 : | |||
317 : | h | 69 | // write interlacing |
318 : | if (pParam->global_flags & XVID_INTERLACING) | ||
319 : | { | ||
320 : | BitstreamPutBit(bs, pMB->field_dct); | ||
321 : | } | ||
322 : | |||
323 : | Isibaar | 3 | // code block coeffs |
324 : | for(i = 0; i < 6; i++) | ||
325 : | { | ||
326 : | if(i < 4) | ||
327 : | edgomez | 78 | BitstreamPutBits(bs, |
328 : | dcy_tab[qcoeff[i*64 + 0] + 255].code, | ||
329 : | dcy_tab[qcoeff[i*64 + 0] + 255].len); | ||
330 : | Isibaar | 3 | else |
331 : | edgomez | 78 | BitstreamPutBits(bs, |
332 : | dcc_tab[qcoeff[i*64 + 0] + 255].code, | ||
333 : | dcc_tab[qcoeff[i*64 + 0] + 255].len); | ||
334 : | Isibaar | 3 | |
335 : | if(pMB->cbp & (1 << (5 - i))) | ||
336 : | { | ||
337 : | bits = BitstreamPos(bs); | ||
338 : | |||
339 : | edgomez | 78 | CodeCoeff(bs, |
340 : | &qcoeff[i*64], | ||
341 : | intra_table, | ||
342 : | scan_tables[pMB->acpred_directions[i]], | ||
343 : | 1); | ||
344 : | Isibaar | 3 | |
345 : | bits = BitstreamPos(bs) - bits; | ||
346 : | pStat->iTextBits += bits; | ||
347 : | } | ||
348 : | } | ||
349 : | edgomez | 78 | |
350 : | Isibaar | 3 | } |
351 : | |||
352 : | |||
353 : | edgomez | 78 | static void CodeBlockInter(const MBParam * pParam, |
354 : | const MACROBLOCK *pMB, | ||
355 : | int16_t qcoeff[6*64], | ||
356 : | Bitstream * bs, | ||
357 : | Statistics * pStat) | ||
358 : | Isibaar | 3 | { |
359 : | edgomez | 78 | |
360 : | Isibaar | 3 | int32_t i; |
361 : | uint32_t bits, mcbpc, cbpy; | ||
362 : | |||
363 : | edgomez | 78 | mcbpc = (pMB->mode & 7) | ((pMB->cbp & 3) << 3); |
364 : | Isibaar | 3 | cbpy = 15 - (pMB->cbp >> 2); |
365 : | |||
366 : | // write mcbpc | ||
367 : | edgomez | 78 | BitstreamPutBits(bs, mcbpc_inter_tab[mcbpc].code, mcbpc_inter_tab[mcbpc].len); |
368 : | Isibaar | 3 | |
369 : | // write cbpy | ||
370 : | BitstreamPutBits(bs, cbpy_tab[cbpy].code, cbpy_tab[cbpy].len); | ||
371 : | |||
372 : | // write dquant | ||
373 : | edgomez | 78 | if(pMB->mode == MODE_INTER_Q) |
374 : | Isibaar | 3 | BitstreamPutBits(bs, pMB->dquant, 2); |
375 : | |||
376 : | h | 69 | // interlacing |
377 : | if (pParam->global_flags & XVID_INTERLACING) | ||
378 : | { | ||
379 : | BitstreamPutBit(bs, pMB->field_dct); | ||
380 : | DEBUG1("codep: field_dct: ", pMB->field_dct); | ||
381 : | |||
382 : | // if inter block, write field ME flag | ||
383 : | if (pMB->mode == MODE_INTER || pMB->mode == MODE_INTER_Q) | ||
384 : | { | ||
385 : | BitstreamPutBit(bs, pMB->field_pred); | ||
386 : | DEBUG1("codep: field_pred: ", pMB->field_pred); | ||
387 : | |||
388 : | // write field prediction references | ||
389 : | if (pMB->field_pred) | ||
390 : | { | ||
391 : | BitstreamPutBit(bs, pMB->field_for_top); | ||
392 : | BitstreamPutBit(bs, pMB->field_for_bot); | ||
393 : | } | ||
394 : | } | ||
395 : | } | ||
396 : | |||
397 : | Isibaar | 3 | // code motion vector(s) |
398 : | for(i = 0; i < (pMB->mode == MODE_INTER4V ? 4 : 1); i++) | ||
399 : | { | ||
400 : | CodeVector(bs, pMB->pmvs[i].x, pParam->fixed_code, pStat); | ||
401 : | CodeVector(bs, pMB->pmvs[i].y, pParam->fixed_code, pStat); | ||
402 : | } | ||
403 : | |||
404 : | bits = BitstreamPos(bs); | ||
405 : | |||
406 : | // code block coeffs | ||
407 : | for(i = 0; i < 6; i++) | ||
408 : | if(pMB->cbp & (1 << (5 - i))) | ||
409 : | edgomez | 78 | CodeCoeff(bs, &qcoeff[i*64], inter_table, scan_tables[0], 0); |
410 : | Isibaar | 3 | |
411 : | bits = BitstreamPos(bs) - bits; | ||
412 : | pStat->iTextBits += bits; | ||
413 : | edgomez | 78 | |
414 : | Isibaar | 3 | } |
415 : | |||
416 : | |||
417 : | edgomez | 78 | void MBCoding(const MBParam * pParam, |
418 : | MACROBLOCK *pMB, | ||
419 : | int16_t qcoeff[6*64], | ||
420 : | Bitstream * bs, | ||
421 : | Statistics * pStat) | ||
422 : | Isibaar | 3 | { |
423 : | edgomez | 78 | |
424 : | Isibaar | 3 | int intra = (pMB->mode == MODE_INTRA || pMB->mode == MODE_INTRA_Q); |
425 : | |||
426 : | edgomez | 78 | if(pParam->coding_type == P_VOP) { |
427 : | Isibaar | 3 | if(pMB->cbp == 0 && pMB->mode == MODE_INTER && |
428 : | edgomez | 78 | pMB->mvs[0].x == 0 && pMB->mvs[0].y == 0) |
429 : | Isibaar | 3 | { |
430 : | BitstreamPutBit(bs, 1); // not_coded | ||
431 : | return; | ||
432 : | } | ||
433 : | else | ||
434 : | BitstreamPutBit(bs, 0); // coded | ||
435 : | } | ||
436 : | |||
437 : | if(intra) | ||
438 : | CodeBlockIntra(pParam, pMB, qcoeff, bs, pStat); | ||
439 : | else | ||
440 : | CodeBlockInter(pParam, pMB, qcoeff, bs, pStat); | ||
441 : | edgomez | 78 | |
442 : | Isibaar | 3 | } |
443 : | |||
444 : | suxen_drol | 118 | /*************************************************************** |
445 : | * bframe encoding start | ||
446 : | ***************************************************************/ | ||
447 : | Isibaar | 3 | |
448 : | suxen_drol | 118 | /* |
449 : | mbtype | ||
450 : | 0 1b direct(h263) mvdb | ||
451 : | 1 01b interpolate mc+q dbquant, mvdf, mvdb | ||
452 : | 2 001b backward mc+q dbquant, mvdb | ||
453 : | 3 0001b forward mc+q dbquant, mvdf | ||
454 : | */ | ||
455 : | |||
456 : | void put_bvop_mbtype(Bitstream * bs, int value) | ||
457 : | { | ||
458 : | switch(value) | ||
459 : | { | ||
460 : | case 0 : BitstreamPutBit(bs, 1); | ||
461 : | return; | ||
462 : | |||
463 : | case 1 : BitstreamPutBit(bs, 0); | ||
464 : | BitstreamPutBit(bs, 1); | ||
465 : | return; | ||
466 : | |||
467 : | case 2 : BitstreamPutBit(bs, 0); | ||
468 : | BitstreamPutBit(bs, 0); | ||
469 : | BitstreamPutBit(bs, 1); | ||
470 : | return; | ||
471 : | |||
472 : | case 3 : BitstreamPutBit(bs, 0); | ||
473 : | BitstreamPutBit(bs, 0); | ||
474 : | BitstreamPutBit(bs, 0); | ||
475 : | BitstreamPutBit(bs, 1); | ||
476 : | return; | ||
477 : | |||
478 : | default : ; // invalid! | ||
479 : | |||
480 : | } | ||
481 : | |||
482 : | } | ||
483 : | |||
484 : | /* | ||
485 : | dbquant | ||
486 : | -2 10b | ||
487 : | 0 0b | ||
488 : | +2 11b | ||
489 : | */ | ||
490 : | |||
491 : | void put_bvop_dbquant(Bitstream *bs, int value) | ||
492 : | { | ||
493 : | switch (value) | ||
494 : | { | ||
495 : | case 0 : BitstreamPutBit(bs, 0); | ||
496 : | return; | ||
497 : | |||
498 : | case -2 : BitstreamPutBit(bs, 1); | ||
499 : | BitstreamPutBit(bs, 0); | ||
500 : | return; | ||
501 : | |||
502 : | case 2 : BitstreamPutBit(bs, 1); | ||
503 : | BitstreamPutBit(bs, 1); | ||
504 : | return; | ||
505 : | |||
506 : | default : ; // invalid | ||
507 : | } | ||
508 : | } | ||
509 : | |||
510 : | |||
511 : | |||
512 : | void MBCodingBVOP(const MACROBLOCK * mb, | ||
513 : | const int16_t qcoeff[6*64], | ||
514 : | const int16_t fcode, | ||
515 : | const int16_t bcode, | ||
516 : | Bitstream * bs, | ||
517 : | Statistics * pStat) | ||
518 : | { | ||
519 : | int i; | ||
520 : | |||
521 : | /* ------------------------------------------------------------------ | ||
522 : | when a block is skipped it is decoded DIRECT(0,) | ||
523 : | hence are interpolated from forward & backward frames | ||
524 : | ------------------------------------------------------------------ */ | ||
525 : | |||
526 : | if (mb->mode == 5) | ||
527 : | { | ||
528 : | BitstreamPutBit(bs, 1); // skipped | ||
529 : | return; | ||
530 : | } | ||
531 : | |||
532 : | BitstreamPutBit(bs, 0); // not skipped | ||
533 : | |||
534 : | if (mb->cbp == 0) | ||
535 : | { | ||
536 : | BitstreamPutBit(bs, 1); // cbp == 0 | ||
537 : | } | ||
538 : | else | ||
539 : | { | ||
540 : | BitstreamPutBit(bs, 0); // cbp == xxx | ||
541 : | } | ||
542 : | |||
543 : | put_bvop_mbtype(bs, mb->mode); | ||
544 : | |||
545 : | if (mb->cbp) | ||
546 : | { | ||
547 : | BitstreamPutBits(bs, mb->cbp, 6); | ||
548 : | } | ||
549 : | |||
550 : | if (mb->mode != MODE_DIRECT && mb->cbp != 0) | ||
551 : | { | ||
552 : | put_bvop_dbquant(bs, 0); // todo: mb->dquant = 0 | ||
553 : | } | ||
554 : | |||
555 : | if (mb->mode == MODE_INTERPOLATE || mb->mode == MODE_FORWARD) | ||
556 : | { | ||
557 : | CodeVector(bs, mb->pmvs[0].x, fcode, pStat); | ||
558 : | CodeVector(bs, mb->pmvs[0].y, fcode, pStat); | ||
559 : | } | ||
560 : | |||
561 : | if (mb->mode == MODE_INTERPOLATE || mb->mode == MODE_BACKWARD) | ||
562 : | { | ||
563 : | CodeVector(bs, mb->b_pmvs[0].x, bcode, pStat); | ||
564 : | CodeVector(bs, mb->b_pmvs[0].y, bcode, pStat); | ||
565 : | } | ||
566 : | |||
567 : | if (mb->mode == MODE_DIRECT) | ||
568 : | { | ||
569 : | // TODO: direct | ||
570 : | } | ||
571 : | |||
572 : | for (i = 0; i < 6; i++) | ||
573 : | { | ||
574 : | if (mb->cbp & (1 << (5 - i))) | ||
575 : | { | ||
576 : | CodeCoeff(bs, &qcoeff[i*64], inter_table, scan_tables[0], 0); | ||
577 : | } | ||
578 : | } | ||
579 : | } | ||
580 : | |||
581 : | |||
582 : | |||
583 : | Isibaar | 3 | /*************************************************************** |
584 : | edgomez | 15 | * decoding stuff starts here * |
585 : | ***************************************************************/ | ||
586 : | Isibaar | 3 | |
587 : | int get_mcbpc_intra(Bitstream * bs) | ||
588 : | { | ||
589 : | edgomez | 78 | |
590 : | Isibaar | 3 | uint32_t index; |
591 : | |||
592 : | while((index = BitstreamShowBits(bs, 9)) == 1) | ||
593 : | BitstreamSkip(bs, 9); | ||
594 : | |||
595 : | index >>= 3; | ||
596 : | |||
597 : | BitstreamSkip(bs, mcbpc_intra_table[index].len); | ||
598 : | edgomez | 78 | |
599 : | Isibaar | 3 | return mcbpc_intra_table[index].code; |
600 : | edgomez | 78 | |
601 : | Isibaar | 3 | } |
602 : | |||
603 : | int get_mcbpc_inter(Bitstream * bs) | ||
604 : | { | ||
605 : | edgomez | 78 | |
606 : | Isibaar | 3 | uint32_t index; |
607 : | |||
608 : | while((index = CLIP(BitstreamShowBits(bs, 9), 256)) == 1) | ||
609 : | BitstreamSkip(bs, 9); | ||
610 : | |||
611 : | edgomez | 78 | BitstreamSkip(bs, mcbpc_inter_table[index].len); |
612 : | |||
613 : | Isibaar | 3 | return mcbpc_inter_table[index].code; |
614 : | edgomez | 78 | |
615 : | Isibaar | 3 | } |
616 : | |||
617 : | int get_cbpy(Bitstream * bs, int intra) | ||
618 : | { | ||
619 : | edgomez | 78 | |
620 : | Isibaar | 3 | int cbpy; |
621 : | uint32_t index = BitstreamShowBits(bs, 6); | ||
622 : | |||
623 : | BitstreamSkip(bs, cbpy_table[index].len); | ||
624 : | cbpy = cbpy_table[index].code; | ||
625 : | |||
626 : | if(!intra) | ||
627 : | cbpy = 15 - cbpy; | ||
628 : | |||
629 : | return cbpy; | ||
630 : | edgomez | 78 | |
631 : | Isibaar | 3 | } |
632 : | |||
633 : | int get_mv_data(Bitstream * bs) | ||
634 : | { | ||
635 : | edgomez | 78 | |
636 : | Isibaar | 3 | uint32_t index; |
637 : | |||
638 : | if(BitstreamGetBit(bs)) | ||
639 : | return 0; | ||
640 : | |||
641 : | index = BitstreamShowBits(bs, 12); | ||
642 : | |||
643 : | if(index >= 512) | ||
644 : | { | ||
645 : | index = (index >> 8) - 2; | ||
646 : | BitstreamSkip(bs, TMNMVtab0[index].len); | ||
647 : | return TMNMVtab0[index].code; | ||
648 : | } | ||
649 : | |||
650 : | if(index >= 128) | ||
651 : | { | ||
652 : | index = (index >> 2) - 32; | ||
653 : | BitstreamSkip(bs, TMNMVtab1[index].len); | ||
654 : | return TMNMVtab1[index].code; | ||
655 : | } | ||
656 : | |||
657 : | index -= 4; | ||
658 : | |||
659 : | BitstreamSkip(bs, TMNMVtab2[index].len); | ||
660 : | return TMNMVtab2[index].code; | ||
661 : | edgomez | 78 | |
662 : | Isibaar | 3 | } |
663 : | |||
664 : | int get_mv(Bitstream * bs, int fcode) | ||
665 : | { | ||
666 : | edgomez | 78 | |
667 : | Isibaar | 3 | int data; |
668 : | int res; | ||
669 : | int mv; | ||
670 : | int scale_fac = 1 << (fcode - 1); | ||
671 : | |||
672 : | data = get_mv_data(bs); | ||
673 : | |||
674 : | if(scale_fac == 1 || data == 0) | ||
675 : | return data; | ||
676 : | |||
677 : | res = BitstreamGetBits(bs, fcode - 1); | ||
678 : | mv = ((ABS(data) - 1) * scale_fac) + res + 1; | ||
679 : | |||
680 : | return data < 0 ? -mv : mv; | ||
681 : | edgomez | 78 | |
682 : | Isibaar | 3 | } |
683 : | |||
684 : | int get_dc_dif(Bitstream * bs, uint32_t dc_size) | ||
685 : | { | ||
686 : | edgomez | 78 | |
687 : | Isibaar | 3 | int code = BitstreamGetBits(bs, dc_size); |
688 : | int msb = code >> (dc_size - 1); | ||
689 : | |||
690 : | if(msb == 0) | ||
691 : | return (-1 * (code^((1 << dc_size) - 1))); | ||
692 : | |||
693 : | return code; | ||
694 : | edgomez | 78 | |
695 : | Isibaar | 3 | } |
696 : | |||
697 : | int get_dc_size_lum(Bitstream * bs) | ||
698 : | { | ||
699 : | edgomez | 78 | |
700 : | Isibaar | 3 | int code, i; |
701 : | code = BitstreamShowBits(bs, 11); | ||
702 : | |||
703 : | for(i = 11; i > 3; i--) { | ||
704 : | if(code == 1) { | ||
705 : | BitstreamSkip(bs, i); | ||
706 : | return i + 1; | ||
707 : | } | ||
708 : | code >>= 1; | ||
709 : | } | ||
710 : | |||
711 : | BitstreamSkip(bs, dc_lum_tab[code].len); | ||
712 : | return dc_lum_tab[code].code; | ||
713 : | edgomez | 78 | |
714 : | Isibaar | 3 | } |
715 : | |||
716 : | |||
717 : | int get_dc_size_chrom(Bitstream * bs) | ||
718 : | { | ||
719 : | edgomez | 78 | |
720 : | Isibaar | 3 | uint32_t code, i; |
721 : | code = BitstreamShowBits(bs, 12); | ||
722 : | |||
723 : | for(i = 12; i > 2; i--) { | ||
724 : | if(code == 1) { | ||
725 : | BitstreamSkip(bs, i); | ||
726 : | return i; | ||
727 : | } | ||
728 : | code >>= 1; | ||
729 : | } | ||
730 : | |||
731 : | return 3 - BitstreamGetBits(bs, 2); | ||
732 : | edgomez | 78 | |
733 : | Isibaar | 3 | } |
734 : | |||
735 : | void get_intra_block(Bitstream * bs, int16_t * block, int direction, int coeff) | ||
736 : | { | ||
737 : | edgomez | 78 | |
738 : | Isibaar | 3 | const uint16_t * scan = scan_tables[ direction ]; |
739 : | int level; | ||
740 : | int run; | ||
741 : | int last; | ||
742 : | |||
743 : | do | ||
744 : | { | ||
745 : | level = get_coeff(bs, &run, &last, 1, 0); | ||
746 : | if (run == -1) | ||
747 : | { | ||
748 : | DEBUG("fatal: invalid run"); | ||
749 : | break; | ||
750 : | } | ||
751 : | coeff += run; | ||
752 : | block[ scan[coeff] ] = level; | ||
753 : | if (level < -127 || level > 127) | ||
754 : | { | ||
755 : | DEBUG1("warning: intra_overflow", level); | ||
756 : | } | ||
757 : | coeff++; | ||
758 : | } while (!last); | ||
759 : | edgomez | 78 | |
760 : | Isibaar | 3 | } |
761 : | |||
762 : | void get_inter_block(Bitstream * bs, int16_t * block) | ||
763 : | { | ||
764 : | edgomez | 78 | |
765 : | Isibaar | 3 | const uint16_t * scan = scan_tables[0]; |
766 : | int p; | ||
767 : | int level; | ||
768 : | int run; | ||
769 : | int last; | ||
770 : | |||
771 : | p = 0; | ||
772 : | do | ||
773 : | { | ||
774 : | level = get_coeff(bs, &run, &last, 0, 0); | ||
775 : | if (run == -1) | ||
776 : | { | ||
777 : | DEBUG("fatal: invalid run"); | ||
778 : | break; | ||
779 : | } | ||
780 : | p += run; | ||
781 : | block[ scan[p] ] = level; | ||
782 : | if (level < -127 || level > 127) | ||
783 : | { | ||
784 : | DEBUG1("warning: inter_overflow", level); | ||
785 : | } | ||
786 : | p++; | ||
787 : | } while (!last); | ||
788 : | edgomez | 78 | |
789 : | Isibaar | 3 | } |
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