1 /* -----------------------------------------------------------------------------
2 Software License for The Fraunhofer FDK AAC Codec Library for Android
3
4 © Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
5 Forschung e.V. All rights reserved.
6
7 1. INTRODUCTION
8 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
9 that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
10 scheme for digital audio. This FDK AAC Codec software is intended to be used on
11 a wide variety of Android devices.
12
13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
14 general perceptual audio codecs. AAC-ELD is considered the best-performing
15 full-bandwidth communications codec by independent studies and is widely
16 deployed. AAC has been standardized by ISO and IEC as part of the MPEG
17 specifications.
18
19 Patent licenses for necessary patent claims for the FDK AAC Codec (including
20 those of Fraunhofer) may be obtained through Via Licensing
21 (www.vialicensing.com) or through the respective patent owners individually for
22 the purpose of encoding or decoding bit streams in products that are compliant
23 with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
24 Android devices already license these patent claims through Via Licensing or
25 directly from the patent owners, and therefore FDK AAC Codec software may
26 already be covered under those patent licenses when it is used for those
27 licensed purposes only.
28
29 Commercially-licensed AAC software libraries, including floating-point versions
30 with enhanced sound quality, are also available from Fraunhofer. Users are
31 encouraged to check the Fraunhofer website for additional applications
32 information and documentation.
33
34 2. COPYRIGHT LICENSE
35
36 Redistribution and use in source and binary forms, with or without modification,
37 are permitted without payment of copyright license fees provided that you
38 satisfy the following conditions:
39
40 You must retain the complete text of this software license in redistributions of
41 the FDK AAC Codec or your modifications thereto in source code form.
42
43 You must retain the complete text of this software license in the documentation
44 and/or other materials provided with redistributions of the FDK AAC Codec or
45 your modifications thereto in binary form. You must make available free of
46 charge copies of the complete source code of the FDK AAC Codec and your
47 modifications thereto to recipients of copies in binary form.
48
49 The name of Fraunhofer may not be used to endorse or promote products derived
50 from this library without prior written permission.
51
52 You may not charge copyright license fees for anyone to use, copy or distribute
53 the FDK AAC Codec software or your modifications thereto.
54
55 Your modified versions of the FDK AAC Codec must carry prominent notices stating
56 that you changed the software and the date of any change. For modified versions
57 of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
58 must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
59 AAC Codec Library for Android."
60
61 3. NO PATENT LICENSE
62
63 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
64 limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
65 Fraunhofer provides no warranty of patent non-infringement with respect to this
66 software.
67
68 You may use this FDK AAC Codec software or modifications thereto only for
69 purposes that are authorized by appropriate patent licenses.
70
71 4. DISCLAIMER
72
73 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
74 holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
75 including but not limited to the implied warranties of merchantability and
76 fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
77 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
78 or consequential damages, including but not limited to procurement of substitute
79 goods or services; loss of use, data, or profits, or business interruption,
80 however caused and on any theory of liability, whether in contract, strict
81 liability, or tort (including negligence), arising in any way out of the use of
82 this software, even if advised of the possibility of such damage.
83
84 5. CONTACT INFORMATION
85
86 Fraunhofer Institute for Integrated Circuits IIS
87 Attention: Audio and Multimedia Departments - FDK AAC LL
88 Am Wolfsmantel 33
89 91058 Erlangen, Germany
90
91 www.iis.fraunhofer.de/amm
92 amm-info@iis.fraunhofer.de
93 ----------------------------------------------------------------------------- */
94
95 /******************* Library for basic calculation routines ********************
96
97 Author(s): M. Lohwasser
98
99 Description: common bitbuffer read/write routines
100
101 *******************************************************************************/
102
103 #include "FDK_bitbuffer.h"
104
105 #include "genericStds.h"
106 #include "common_fix.h"
107 #include "fixminmax.h"
108
109 const UINT BitMask[32 + 1] = {
110 0x0, 0x1, 0x3, 0x7, 0xf, 0x1f,
111 0x3f, 0x7f, 0xff, 0x1ff, 0x3ff, 0x7ff,
112 0xfff, 0x1fff, 0x3fff, 0x7fff, 0xffff, 0x1ffff,
113 0x3ffff, 0x7ffff, 0xfffff, 0x1fffff, 0x3fffff, 0x7fffff,
114 0xffffff, 0x1ffffff, 0x3ffffff, 0x7ffffff, 0xfffffff, 0x1fffffff,
115 0x3fffffff, 0x7fffffff, 0xffffffff};
116
FDK_CreateBitBuffer(HANDLE_FDK_BITBUF * hBitBuf,UCHAR * pBuffer,UINT bufSize)117 void FDK_CreateBitBuffer(HANDLE_FDK_BITBUF *hBitBuf, UCHAR *pBuffer,
118 UINT bufSize) {
119 FDK_InitBitBuffer(*hBitBuf, pBuffer, bufSize, 0);
120
121 FDKmemclear((*hBitBuf)->Buffer, bufSize * sizeof(UCHAR));
122 }
123
FDK_DeleteBitBuffer(HANDLE_FDK_BITBUF hBitBuf)124 void FDK_DeleteBitBuffer(HANDLE_FDK_BITBUF hBitBuf) { ; }
125
FDK_InitBitBuffer(HANDLE_FDK_BITBUF hBitBuf,UCHAR * pBuffer,UINT bufSize,UINT validBits)126 void FDK_InitBitBuffer(HANDLE_FDK_BITBUF hBitBuf, UCHAR *pBuffer, UINT bufSize,
127 UINT validBits) {
128 hBitBuf->ValidBits = validBits;
129 hBitBuf->ReadOffset = 0;
130 hBitBuf->WriteOffset = 0;
131 hBitBuf->BitNdx = 0;
132
133 hBitBuf->Buffer = pBuffer;
134 hBitBuf->bufSize = bufSize;
135 hBitBuf->bufBits = (bufSize << 3);
136 /*assure bufsize (2^n) */
137 FDK_ASSERT(hBitBuf->ValidBits <= hBitBuf->bufBits);
138 FDK_ASSERT((bufSize > 0) && (bufSize <= MAX_BUFSIZE_BYTES));
139 {
140 UINT x = 0, n = bufSize;
141 for (x = 0; n > 0; x++, n >>= 1) {
142 }
143 if (bufSize != ((UINT)1 << (x - 1))) {
144 FDK_ASSERT(0);
145 }
146 }
147 }
148
FDK_ResetBitBuffer(HANDLE_FDK_BITBUF hBitBuf)149 void FDK_ResetBitBuffer(HANDLE_FDK_BITBUF hBitBuf) {
150 hBitBuf->ValidBits = 0;
151 hBitBuf->ReadOffset = 0;
152 hBitBuf->WriteOffset = 0;
153 hBitBuf->BitNdx = 0;
154 }
155
156 #ifndef FUNCTION_FDK_get
FDK_get(HANDLE_FDK_BITBUF hBitBuf,const UINT numberOfBits)157 INT FDK_get(HANDLE_FDK_BITBUF hBitBuf, const UINT numberOfBits) {
158 UINT byteOffset = hBitBuf->BitNdx >> 3;
159 UINT bitOffset = hBitBuf->BitNdx & 0x07;
160
161 hBitBuf->BitNdx = (hBitBuf->BitNdx + numberOfBits) & (hBitBuf->bufBits - 1);
162 hBitBuf->ValidBits -= numberOfBits;
163
164 UINT byteMask = hBitBuf->bufSize - 1;
165
166 UINT tx = (hBitBuf->Buffer[byteOffset & byteMask] << 24) |
167 (hBitBuf->Buffer[(byteOffset + 1) & byteMask] << 16) |
168 (hBitBuf->Buffer[(byteOffset + 2) & byteMask] << 8) |
169 hBitBuf->Buffer[(byteOffset + 3) & byteMask];
170
171 if (bitOffset) {
172 tx <<= bitOffset;
173 tx |= hBitBuf->Buffer[(byteOffset + 4) & byteMask] >> (8 - bitOffset);
174 }
175
176 return (tx >> (32 - numberOfBits));
177 }
178 #endif /* #ifndef FUNCTION_FDK_get */
179
180 #ifndef FUNCTION_FDK_get32
FDK_get32(HANDLE_FDK_BITBUF hBitBuf)181 INT FDK_get32(HANDLE_FDK_BITBUF hBitBuf) {
182 UINT BitNdx = hBitBuf->BitNdx + 32;
183 hBitBuf->BitNdx = BitNdx & (hBitBuf->bufBits - 1);
184 hBitBuf->ValidBits = (UINT)((INT)hBitBuf->ValidBits - (INT)32);
185
186 UINT byteOffset = (BitNdx - 1) >> 3;
187 if (BitNdx <= hBitBuf->bufBits) {
188 UINT cache = (hBitBuf->Buffer[(byteOffset - 3)] << 24) |
189 (hBitBuf->Buffer[(byteOffset - 2)] << 16) |
190 (hBitBuf->Buffer[(byteOffset - 1)] << 8) |
191 hBitBuf->Buffer[(byteOffset - 0)];
192
193 if ((BitNdx = (BitNdx & 7)) != 0) {
194 cache = (cache >> (8 - BitNdx)) |
195 ((UINT)hBitBuf->Buffer[byteOffset - 4] << (24 + BitNdx));
196 }
197 return (cache);
198 } else {
199 UINT byte_mask = hBitBuf->bufSize - 1;
200 UINT cache = (hBitBuf->Buffer[(byteOffset - 3) & byte_mask] << 24) |
201 (hBitBuf->Buffer[(byteOffset - 2) & byte_mask] << 16) |
202 (hBitBuf->Buffer[(byteOffset - 1) & byte_mask] << 8) |
203 hBitBuf->Buffer[(byteOffset - 0) & byte_mask];
204
205 if ((BitNdx = (BitNdx & 7)) != 0) {
206 cache = (cache >> (8 - BitNdx)) |
207 ((UINT)hBitBuf->Buffer[(byteOffset - 4) & byte_mask]
208 << (24 + BitNdx));
209 }
210 return (cache);
211 }
212 }
213 #endif
214
FDK_getBwd(HANDLE_FDK_BITBUF hBitBuf,const UINT numberOfBits)215 INT FDK_getBwd(HANDLE_FDK_BITBUF hBitBuf, const UINT numberOfBits) {
216 UINT byteOffset = hBitBuf->BitNdx >> 3;
217 UINT bitOffset = hBitBuf->BitNdx & 0x07;
218 UINT byteMask = hBitBuf->bufSize - 1;
219 int i;
220
221 hBitBuf->BitNdx = (hBitBuf->BitNdx - numberOfBits) & (hBitBuf->bufBits - 1);
222 hBitBuf->ValidBits += numberOfBits;
223
224 UINT tx = hBitBuf->Buffer[(byteOffset - 3) & byteMask] << 24 |
225 hBitBuf->Buffer[(byteOffset - 2) & byteMask] << 16 |
226 hBitBuf->Buffer[(byteOffset - 1) & byteMask] << 8 |
227 hBitBuf->Buffer[byteOffset & byteMask];
228 UINT txa = 0x0;
229
230 tx >>= (8 - bitOffset);
231
232 if (bitOffset && numberOfBits > 24) {
233 tx |= hBitBuf->Buffer[(byteOffset - 4) & byteMask] << (24 + bitOffset);
234 }
235
236 /* in place turn around */
237 for (i = 0; i < 16; i++) {
238 UINT bitMaskR = 0x00000001 << i;
239 UINT bitMaskL = 0x80000000 >> i;
240
241 txa |= (tx & bitMaskR) << (31 - (i << 1));
242 txa |= (tx & bitMaskL) >> (31 - (i << 1));
243 }
244
245 return (txa >> (32 - numberOfBits));
246 }
247
FDK_put(HANDLE_FDK_BITBUF hBitBuf,UINT value,const UINT numberOfBits)248 void FDK_put(HANDLE_FDK_BITBUF hBitBuf, UINT value, const UINT numberOfBits) {
249 if (numberOfBits != 0) {
250 UINT byteOffset0 = hBitBuf->BitNdx >> 3;
251 UINT bitOffset = hBitBuf->BitNdx & 0x7;
252
253 hBitBuf->BitNdx = (hBitBuf->BitNdx + numberOfBits) & (hBitBuf->bufBits - 1);
254 hBitBuf->ValidBits += numberOfBits;
255
256 UINT byteMask = hBitBuf->bufSize - 1;
257
258 UINT byteOffset1 = (byteOffset0 + 1) & byteMask;
259 UINT byteOffset2 = (byteOffset0 + 2) & byteMask;
260 UINT byteOffset3 = (byteOffset0 + 3) & byteMask;
261
262 // Create tmp containing free bits at the left border followed by bits to
263 // write, LSB's are cleared, if available Create mask to apply upon all
264 // buffer bytes
265 UINT tmp = (value << (32 - numberOfBits)) >> bitOffset;
266 UINT mask = ~((BitMask[numberOfBits] << (32 - numberOfBits)) >> bitOffset);
267
268 // read all 4 bytes from buffer and create a 32-bit cache
269 UINT cache = (((UINT)hBitBuf->Buffer[byteOffset0]) << 24) |
270 (((UINT)hBitBuf->Buffer[byteOffset1]) << 16) |
271 (((UINT)hBitBuf->Buffer[byteOffset2]) << 8) |
272 (((UINT)hBitBuf->Buffer[byteOffset3]) << 0);
273
274 cache = (cache & mask) | tmp;
275 hBitBuf->Buffer[byteOffset0] = (UCHAR)(cache >> 24);
276 hBitBuf->Buffer[byteOffset1] = (UCHAR)(cache >> 16);
277 hBitBuf->Buffer[byteOffset2] = (UCHAR)(cache >> 8);
278 hBitBuf->Buffer[byteOffset3] = (UCHAR)(cache >> 0);
279
280 if ((bitOffset + numberOfBits) > 32) {
281 UINT byteOffset4 = (byteOffset0 + 4) & byteMask;
282 // remaining bits: in range 1..7
283 // replace MSBits of next byte in buffer by LSBits of "value"
284 int bits = (bitOffset + numberOfBits) & 7;
285 cache =
286 (UINT)hBitBuf->Buffer[byteOffset4] & (~(BitMask[bits] << (8 - bits)));
287 cache |= value << (8 - bits);
288 hBitBuf->Buffer[byteOffset4] = (UCHAR)cache;
289 }
290 }
291 }
292
FDK_putBwd(HANDLE_FDK_BITBUF hBitBuf,UINT value,const UINT numberOfBits)293 void FDK_putBwd(HANDLE_FDK_BITBUF hBitBuf, UINT value,
294 const UINT numberOfBits) {
295 UINT byteOffset = hBitBuf->BitNdx >> 3;
296 UINT bitOffset = 7 - (hBitBuf->BitNdx & 0x07);
297 UINT byteMask = hBitBuf->bufSize - 1;
298
299 UINT mask = ~(BitMask[numberOfBits] << bitOffset);
300 UINT tmp = 0x0000;
301 int i;
302
303 hBitBuf->BitNdx = (hBitBuf->BitNdx - numberOfBits) & (hBitBuf->bufBits - 1);
304 hBitBuf->ValidBits -= numberOfBits;
305
306 /* in place turn around */
307 for (i = 0; i < 16; i++) {
308 UINT bitMaskR = 0x00000001 << i;
309 UINT bitMaskL = 0x80000000 >> i;
310
311 tmp |= (value & bitMaskR) << (31 - (i << 1));
312 tmp |= (value & bitMaskL) >> (31 - (i << 1));
313 }
314 value = tmp;
315 tmp = value >> (32 - numberOfBits) << bitOffset;
316
317 hBitBuf->Buffer[byteOffset & byteMask] =
318 (hBitBuf->Buffer[byteOffset & byteMask] & (mask)) | (UCHAR)(tmp);
319 hBitBuf->Buffer[(byteOffset - 1) & byteMask] =
320 (hBitBuf->Buffer[(byteOffset - 1) & byteMask] & (mask >> 8)) |
321 (UCHAR)(tmp >> 8);
322 hBitBuf->Buffer[(byteOffset - 2) & byteMask] =
323 (hBitBuf->Buffer[(byteOffset - 2) & byteMask] & (mask >> 16)) |
324 (UCHAR)(tmp >> 16);
325 hBitBuf->Buffer[(byteOffset - 3) & byteMask] =
326 (hBitBuf->Buffer[(byteOffset - 3) & byteMask] & (mask >> 24)) |
327 (UCHAR)(tmp >> 24);
328
329 if ((bitOffset + numberOfBits) > 32) {
330 hBitBuf->Buffer[(byteOffset - 4) & byteMask] =
331 (UCHAR)(value >> (64 - numberOfBits - bitOffset)) |
332 (hBitBuf->Buffer[(byteOffset - 4) & byteMask] &
333 ~(BitMask[bitOffset] >> (32 - numberOfBits)));
334 }
335 }
336
337 #ifndef FUNCTION_FDK_pushBack
FDK_pushBack(HANDLE_FDK_BITBUF hBitBuf,const UINT numberOfBits,UCHAR config)338 void FDK_pushBack(HANDLE_FDK_BITBUF hBitBuf, const UINT numberOfBits,
339 UCHAR config) {
340 hBitBuf->ValidBits =
341 (config == 0) ? (UINT)((INT)hBitBuf->ValidBits + (INT)numberOfBits)
342 : ((UINT)((INT)hBitBuf->ValidBits - (INT)numberOfBits));
343 hBitBuf->BitNdx = ((UINT)((INT)hBitBuf->BitNdx - (INT)numberOfBits)) &
344 (hBitBuf->bufBits - 1);
345 }
346 #endif
347
FDK_pushForward(HANDLE_FDK_BITBUF hBitBuf,const UINT numberOfBits,UCHAR config)348 void FDK_pushForward(HANDLE_FDK_BITBUF hBitBuf, const UINT numberOfBits,
349 UCHAR config) {
350 hBitBuf->ValidBits =
351 (config == 0) ? ((UINT)((INT)hBitBuf->ValidBits - (INT)numberOfBits))
352 : (UINT)((INT)hBitBuf->ValidBits + (INT)numberOfBits);
353 hBitBuf->BitNdx =
354 (UINT)((INT)hBitBuf->BitNdx + (INT)numberOfBits) & (hBitBuf->bufBits - 1);
355 }
356
357 #ifndef FUNCTION_FDK_getValidBits
FDK_getValidBits(HANDLE_FDK_BITBUF hBitBuf)358 UINT FDK_getValidBits(HANDLE_FDK_BITBUF hBitBuf) { return hBitBuf->ValidBits; }
359 #endif /* #ifndef FUNCTION_FDK_getValidBits */
360
FDK_getFreeBits(HANDLE_FDK_BITBUF hBitBuf)361 INT FDK_getFreeBits(HANDLE_FDK_BITBUF hBitBuf) {
362 return (hBitBuf->bufBits - hBitBuf->ValidBits);
363 }
364
FDK_Feed(HANDLE_FDK_BITBUF hBitBuf,const UCHAR * RESTRICT inputBuffer,const UINT bufferSize,UINT * bytesValid)365 void FDK_Feed(HANDLE_FDK_BITBUF hBitBuf, const UCHAR *RESTRICT inputBuffer,
366 const UINT bufferSize, UINT *bytesValid) {
367 inputBuffer = &inputBuffer[bufferSize - *bytesValid];
368
369 UINT bTotal = 0;
370
371 UINT bToRead = (hBitBuf->bufBits - hBitBuf->ValidBits) >> 3;
372 UINT noOfBytes =
373 fMin(bToRead,
374 *bytesValid); //(bToRead < *bytesValid) ? bToRead : *bytesValid ;
375
376 while (noOfBytes > 0) {
377 /* split read to buffer size */
378 bToRead = hBitBuf->bufSize - hBitBuf->ReadOffset;
379 bToRead = fMin(bToRead,
380 noOfBytes); //(bToRead < noOfBytes) ? bToRead : noOfBytes ;
381
382 /* copy 'bToRead' bytes from 'ptr' to inputbuffer */
383 FDKmemcpy(&hBitBuf->Buffer[hBitBuf->ReadOffset], inputBuffer,
384 bToRead * sizeof(UCHAR));
385
386 /* add noOfBits to number of valid bits in buffer */
387 hBitBuf->ValidBits += bToRead << 3;
388 bTotal += bToRead;
389 inputBuffer += bToRead;
390
391 hBitBuf->ReadOffset =
392 (hBitBuf->ReadOffset + bToRead) & (hBitBuf->bufSize - 1);
393 noOfBytes -= bToRead;
394 }
395
396 *bytesValid -= bTotal;
397 }
398
CopyAlignedBlock(HANDLE_FDK_BITBUF h_BitBufSrc,UCHAR * RESTRICT dstBuffer,UINT bToRead)399 void CopyAlignedBlock(HANDLE_FDK_BITBUF h_BitBufSrc, UCHAR *RESTRICT dstBuffer,
400 UINT bToRead) {
401 UINT byteOffset = h_BitBufSrc->BitNdx >> 3;
402 const UINT byteMask = h_BitBufSrc->bufSize - 1;
403
404 UCHAR *RESTRICT pBBB = h_BitBufSrc->Buffer;
405 for (UINT i = 0; i < bToRead; i++) {
406 dstBuffer[i] = pBBB[(byteOffset + i) & byteMask];
407 }
408
409 bToRead <<= 3;
410
411 h_BitBufSrc->BitNdx =
412 (h_BitBufSrc->BitNdx + bToRead) & (h_BitBufSrc->bufBits - 1);
413 h_BitBufSrc->ValidBits -= bToRead;
414 }
415
FDK_Copy(HANDLE_FDK_BITBUF h_BitBufDst,HANDLE_FDK_BITBUF h_BitBufSrc,UINT * bytesValid)416 void FDK_Copy(HANDLE_FDK_BITBUF h_BitBufDst, HANDLE_FDK_BITBUF h_BitBufSrc,
417 UINT *bytesValid) {
418 INT bTotal = 0;
419
420 /* limit noOfBytes to valid bytes in src buffer and available bytes in dst
421 * buffer */
422 UINT bToRead = h_BitBufSrc->ValidBits >> 3;
423 UINT noOfBytes =
424 fMin(bToRead,
425 *bytesValid); //(*bytesValid < bToRead) ? *bytesValid : bToRead ;
426 bToRead = FDK_getFreeBits(h_BitBufDst);
427 noOfBytes =
428 fMin(bToRead, noOfBytes); //(bToRead < noOfBytes) ? bToRead : noOfBytes;
429
430 while (noOfBytes > 0) {
431 /* Split Read to buffer size */
432 bToRead = h_BitBufDst->bufSize - h_BitBufDst->ReadOffset;
433 bToRead = fMin(noOfBytes,
434 bToRead); //(noOfBytes < bToRead) ? noOfBytes : bToRead ;
435
436 /* copy 'bToRead' bytes from buffer to buffer */
437 if (!(h_BitBufSrc->BitNdx & 0x07)) {
438 CopyAlignedBlock(h_BitBufSrc,
439 h_BitBufDst->Buffer + h_BitBufDst->ReadOffset, bToRead);
440 } else {
441 for (UINT i = 0; i < bToRead; i++) {
442 h_BitBufDst->Buffer[h_BitBufDst->ReadOffset + i] =
443 (UCHAR)FDK_get(h_BitBufSrc, 8);
444 }
445 }
446
447 /* add noOfBits to number of valid bits in buffer */
448 h_BitBufDst->ValidBits += bToRead << 3;
449 bTotal += bToRead;
450
451 h_BitBufDst->ReadOffset =
452 (h_BitBufDst->ReadOffset + bToRead) & (h_BitBufDst->bufSize - 1);
453 noOfBytes -= bToRead;
454 }
455
456 *bytesValid -= bTotal;
457 }
458
FDK_Fetch(HANDLE_FDK_BITBUF hBitBuf,UCHAR * outBuf,UINT * writeBytes)459 void FDK_Fetch(HANDLE_FDK_BITBUF hBitBuf, UCHAR *outBuf, UINT *writeBytes) {
460 UCHAR *RESTRICT outputBuffer = outBuf;
461 UINT bTotal = 0;
462
463 UINT bToWrite = (hBitBuf->ValidBits) >> 3;
464 UINT noOfBytes =
465 fMin(bToWrite,
466 *writeBytes); //(bToWrite < *writeBytes) ? bToWrite : *writeBytes ;
467
468 while (noOfBytes > 0) {
469 /* split write to buffer size */
470 bToWrite = hBitBuf->bufSize - hBitBuf->WriteOffset;
471 bToWrite = fMin(
472 bToWrite, noOfBytes); //(bToWrite < noOfBytes) ? bToWrite : noOfBytes ;
473
474 /* copy 'bToWrite' bytes from bitbuffer to outputbuffer */
475 FDKmemcpy(outputBuffer, &hBitBuf->Buffer[hBitBuf->WriteOffset],
476 bToWrite * sizeof(UCHAR));
477
478 /* sub noOfBits from number of valid bits in buffer */
479 hBitBuf->ValidBits -= bToWrite << 3;
480 bTotal += bToWrite;
481 outputBuffer += bToWrite;
482
483 hBitBuf->WriteOffset =
484 (hBitBuf->WriteOffset + bToWrite) & (hBitBuf->bufSize - 1);
485 noOfBytes -= bToWrite;
486 }
487
488 *writeBytes = bTotal;
489 }
490