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Prevent bit buffer counter overflow. 

While long-term test we discovered a bit counter overflow in the bit buffer.
The bit buffer state was only used by HCR and RVLC tool and can easily be substituted with FDKgetValidBits() call.
The following patch completely removes the bit counter and all its obsolete functions.

Bug: 112662184
Test: atest DecoderTestXheAac ; atest DecoderTestAacDrc

Change-Id: Icee0519d26a2aa62367d2dece59cd3d60ffcade7
This commit is contained in:
Fraunhofer IIS FDK 2018-06-08 18:03:16 +02:00 committed by Jean-Michel Trivi
parent f19e863cce
commit 15292f7e96
12 changed files with 91 additions and 166 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

82
libAACdec/src/aacdec_hcr.cpp
View File

@ -134,17 +134,18 @@ static void DeriveNumberOfExtendedSortedSectionsInSets(
USHORT *pNumExtendedSortedSectionsInSets, USHORT *pNumExtendedSortedSectionsInSets,
int numExtendedSortedSectionsInSetsIdx); int numExtendedSortedSectionsInSetsIdx);
static INT DecodeEscapeSequence(HANDLE_FDK_BITSTREAM bs, INT quantSpecCoef, static INT DecodeEscapeSequence(HANDLE_FDK_BITSTREAM bs, const INT bsAnchor,
INT *pLeftStartOfSegment, INT quantSpecCoef, INT *pLeftStartOfSegment,
SCHAR *pRemainingBitsInSegment, SCHAR *pRemainingBitsInSegment,
int *pNumDecodedBits); int *pNumDecodedBits);
static int DecodePCW_Sign(HANDLE_FDK_BITSTREAM bs, UINT codebookDim, static int DecodePCW_Sign(HANDLE_FDK_BITSTREAM bs, const INT bsAnchor,
const SCHAR *pQuantVal, FIXP_DBL *pQuantSpecCoef, UINT codebookDim, const SCHAR *pQuantVal,
int *quantSpecCoefIdx, INT *pLeftStartOfSegment, FIXP_DBL *pQuantSpecCoef, int *quantSpecCoefIdx,
INT *pLeftStartOfSegment,
SCHAR *pRemainingBitsInSegment, int *pNumDecodedBits); SCHAR *pRemainingBitsInSegment, int *pNumDecodedBits);
static const SCHAR *DecodePCW_Body(HANDLE_FDK_BITSTREAM bs, static const SCHAR *DecodePCW_Body(HANDLE_FDK_BITSTREAM bs, const INT bsAnchor,
const UINT *pCurrentTree, const UINT *pCurrentTree,
const SCHAR *pQuantValBase, const SCHAR *pQuantValBase,
INT *pLeftStartOfSegment, INT *pLeftStartOfSegment,
@ -291,7 +292,7 @@ UINT HcrInit(H_HCR_INFO pHcr, CAacDecoderChannelInfo *pAacDecoderChannelInfo,
SPEC_LONG(pAacDecoderChannelInfo->pSpectralCoefficient); SPEC_LONG(pAacDecoderChannelInfo->pSpectralCoefficient);
FDKsyncCache(bs); FDKsyncCache(bs);
pHcr->decInOut.bitstreamIndex = FDKgetBitCnt(bs); pHcr->decInOut.bitstreamAnchor = (INT)FDKgetValidBits(bs);
if (!IsLongBlock(&pAacDecoderChannelInfo->icsInfo)) /* short block */ if (!IsLongBlock(&pAacDecoderChannelInfo->icsInfo)) /* short block */
{ {
@ -436,7 +437,7 @@ UINT HcrDecoder(H_HCR_INFO pHcr, CAacDecoderChannelInfo *pAacDecoderChannelInfo,
int pTmp5; int pTmp5;
INT bitCntOffst; INT bitCntOffst;
INT saveBitCnt = FDKgetBitCnt(bs); /* save bitstream position */ INT saveBitCnt = (INT)FDKgetValidBits(bs); /* save bitstream position */
HcrCalcNumCodeword(pHcr); HcrCalcNumCodeword(pHcr);
@ -487,7 +488,7 @@ UINT HcrDecoder(H_HCR_INFO pHcr, CAacDecoderChannelInfo *pAacDecoderChannelInfo,
pSamplingRateInfo); pSamplingRateInfo);
/* restore bitstream position */ /* restore bitstream position */
bitCntOffst = saveBitCnt - FDKgetBitCnt(bs); bitCntOffst = (INT)FDKgetValidBits(bs) - saveBitCnt;
if (bitCntOffst) { if (bitCntOffst) {
FDKpushBiDirectional(bs, bitCntOffst); FDKpushBiDirectional(bs, bitCntOffst);
} }
@ -815,7 +816,6 @@ static void HcrPrepareSegmentationGrid(H_HCR_INFO pHcr) {
INT *pLeftStartOfSegment = pHcr->segmentInfo.pLeftStartOfSegment; INT *pLeftStartOfSegment = pHcr->segmentInfo.pLeftStartOfSegment;
INT *pRightStartOfSegment = pHcr->segmentInfo.pRightStartOfSegment; INT *pRightStartOfSegment = pHcr->segmentInfo.pRightStartOfSegment;
SCHAR *pRemainingBitsInSegment = pHcr->segmentInfo.pRemainingBitsInSegment; SCHAR *pRemainingBitsInSegment = pHcr->segmentInfo.pRemainingBitsInSegment;
INT bitstreamIndex = pHcr->decInOut.bitstreamIndex;
const UCHAR *pMaxCwLength = aMaxCwLen; const UCHAR *pMaxCwLength = aMaxCwLen;
for (i = numSortedSection; i != 0; i--) { for (i = numSortedSection; i != 0; i--) {
@ -825,7 +825,7 @@ static void HcrPrepareSegmentationGrid(H_HCR_INFO pHcr) {
for (j = *pNumSortedCodewordInSection; j != 0; j--) { for (j = *pNumSortedCodewordInSection; j != 0; j--) {
/* width allows a new segment */ /* width allows a new segment */
intermediateResult = bitstreamIndex + segmentStart; intermediateResult = segmentStart;
if ((segmentStart + segmentWidth) <= lengthOfReorderedSpectralData) { if ((segmentStart + segmentWidth) <= lengthOfReorderedSpectralData) {
/* store segment start, segment length and increment the number of /* store segment start, segment length and increment the number of
* segments */ * segments */
@ -841,12 +841,11 @@ static void HcrPrepareSegmentationGrid(H_HCR_INFO pHcr) {
pLeftStartOfSegment--; pLeftStartOfSegment--;
pRightStartOfSegment--; pRightStartOfSegment--;
pRemainingBitsInSegment--; pRemainingBitsInSegment--;
segmentStart = *pLeftStartOfSegment - bitstreamIndex; segmentStart = *pLeftStartOfSegment;
lastSegmentWidth = lengthOfReorderedSpectralData - segmentStart; lastSegmentWidth = lengthOfReorderedSpectralData - segmentStart;
*pRemainingBitsInSegment = lastSegmentWidth; *pRemainingBitsInSegment = lastSegmentWidth;
*pRightStartOfSegment = *pRightStartOfSegment = segmentStart + lastSegmentWidth - 1;
bitstreamIndex + segmentStart + lastSegmentWidth - 1;
endFlag = 1; endFlag = 1;
break; break;
} }
@ -1071,9 +1070,9 @@ static void DecodePCWs(HANDLE_FDK_BITSTREAM bs, H_HCR_INFO pHcr) {
numDecodedBits = 0; numDecodedBits = 0;
/* decode PCW_BODY */ /* decode PCW_BODY */
pQuantVal = pQuantVal = DecodePCW_Body(
DecodePCW_Body(bs, pCurrentTree, pQuantValBase, pLeftStartOfSegment, bs, pHcr->decInOut.bitstreamAnchor, pCurrentTree, pQuantValBase,
pRemainingBitsInSegment, &numDecodedBits); pLeftStartOfSegment, pRemainingBitsInSegment, &numDecodedBits);
/* result is written out here because NO sign bits follow the body */ /* result is written out here because NO sign bits follow the body */
for (i = dimension; i != 0; i--) { for (i = dimension; i != 0; i--) {
@ -1115,14 +1114,14 @@ static void DecodePCWs(HANDLE_FDK_BITSTREAM bs, H_HCR_INFO pHcr) {
int err; int err;
numDecodedBits = 0; numDecodedBits = 0;
pQuantVal = pQuantVal = DecodePCW_Body(
DecodePCW_Body(bs, pCurrentTree, pQuantValBase, pLeftStartOfSegment, bs, pHcr->decInOut.bitstreamAnchor, pCurrentTree, pQuantValBase,
pRemainingBitsInSegment, &numDecodedBits); pLeftStartOfSegment, pRemainingBitsInSegment, &numDecodedBits);
err = DecodePCW_Sign( err = DecodePCW_Sign(
bs, dimension, pQuantVal, pQuantizedSpectralCoefficients, bs, pHcr->decInOut.bitstreamAnchor, dimension, pQuantVal,
&quantizedSpectralCoefficientsIdx, pLeftStartOfSegment, pQuantizedSpectralCoefficients, &quantizedSpectralCoefficientsIdx,
pRemainingBitsInSegment, &numDecodedBits); pLeftStartOfSegment, pRemainingBitsInSegment, &numDecodedBits);
if (err != 0) { if (err != 0) {
return; return;
} }
@ -1157,14 +1156,14 @@ static void DecodePCWs(HANDLE_FDK_BITSTREAM bs, H_HCR_INFO pHcr) {
numDecodedBits = 0; numDecodedBits = 0;
/* decode PCW_BODY */ /* decode PCW_BODY */
pQuantVal = pQuantVal = DecodePCW_Body(
DecodePCW_Body(bs, pCurrentTree, pQuantValBase, pLeftStartOfSegment, bs, pHcr->decInOut.bitstreamAnchor, pCurrentTree, pQuantValBase,
pRemainingBitsInSegment, &numDecodedBits); pLeftStartOfSegment, pRemainingBitsInSegment, &numDecodedBits);
err = DecodePCW_Sign( err = DecodePCW_Sign(
bs, dimension, pQuantVal, pQuantizedSpectralCoefficients, bs, pHcr->decInOut.bitstreamAnchor, dimension, pQuantVal,
&quantizedSpectralCoefficientsIdx, pLeftStartOfSegment, pQuantizedSpectralCoefficients, &quantizedSpectralCoefficientsIdx,
pRemainingBitsInSegment, &numDecodedBits); pLeftStartOfSegment, pRemainingBitsInSegment, &numDecodedBits);
if (err != 0) { if (err != 0) {
return; return;
} }
@ -1177,7 +1176,7 @@ static void DecodePCWs(HANDLE_FDK_BITSTREAM bs, H_HCR_INFO pHcr) {
(FIXP_DBL)ESCAPE_VALUE) { (FIXP_DBL)ESCAPE_VALUE) {
pQuantizedSpectralCoefficients[quantizedSpectralCoefficientsIdx] = pQuantizedSpectralCoefficients[quantizedSpectralCoefficientsIdx] =
(FIXP_DBL)DecodeEscapeSequence( (FIXP_DBL)DecodeEscapeSequence(
bs, bs, pHcr->decInOut.bitstreamAnchor,
pQuantizedSpectralCoefficients pQuantizedSpectralCoefficients
[quantizedSpectralCoefficientsIdx], [quantizedSpectralCoefficientsIdx],
pLeftStartOfSegment, pRemainingBitsInSegment, pLeftStartOfSegment, pRemainingBitsInSegment,
@ -1193,7 +1192,7 @@ static void DecodePCWs(HANDLE_FDK_BITSTREAM bs, H_HCR_INFO pHcr) {
(FIXP_DBL)ESCAPE_VALUE) { (FIXP_DBL)ESCAPE_VALUE) {
pQuantizedSpectralCoefficients[quantizedSpectralCoefficientsIdx] = pQuantizedSpectralCoefficients[quantizedSpectralCoefficientsIdx] =
(FIXP_DBL)DecodeEscapeSequence( (FIXP_DBL)DecodeEscapeSequence(
bs, bs, pHcr->decInOut.bitstreamAnchor,
pQuantizedSpectralCoefficients pQuantizedSpectralCoefficients
[quantizedSpectralCoefficientsIdx], [quantizedSpectralCoefficientsIdx],
pLeftStartOfSegment, pRemainingBitsInSegment, pLeftStartOfSegment, pRemainingBitsInSegment,
@ -1331,7 +1330,7 @@ void CarryBitToBranchValue(UCHAR carryBit, UINT treeNode, UINT *branchValue,
spectral coefficients spectral coefficients
-------------------------------------------------------------------------------------------- --------------------------------------------------------------------------------------------
*/ */
static const SCHAR *DecodePCW_Body(HANDLE_FDK_BITSTREAM bs, static const SCHAR *DecodePCW_Body(HANDLE_FDK_BITSTREAM bs, const INT bsAnchor,
const UINT *pCurrentTree, const UINT *pCurrentTree,
const SCHAR *pQuantValBase, const SCHAR *pQuantValBase,
INT *pLeftStartOfSegment, INT *pLeftStartOfSegment,
@ -1349,7 +1348,7 @@ static const SCHAR *DecodePCW_Body(HANDLE_FDK_BITSTREAM bs,
/* decode whole PCW-codeword-body */ /* decode whole PCW-codeword-body */
while (1) { while (1) {
carryBit = HcrGetABitFromBitstream(bs, pLeftStartOfSegment, carryBit = HcrGetABitFromBitstream(bs, bsAnchor, pLeftStartOfSegment,
pLeftStartOfSegment, /* dummy */ pLeftStartOfSegment, /* dummy */
FROM_LEFT_TO_RIGHT); FROM_LEFT_TO_RIGHT);
*pRemainingBitsInSegment -= 1; *pRemainingBitsInSegment -= 1;
@ -1384,8 +1383,8 @@ value == 16, a escapeSequence is decoded in two steps:
-------------------------------------------------------------------------------------------- --------------------------------------------------------------------------------------------
*/ */
static INT DecodeEscapeSequence(HANDLE_FDK_BITSTREAM bs, INT quantSpecCoef, static INT DecodeEscapeSequence(HANDLE_FDK_BITSTREAM bs, const INT bsAnchor,
INT *pLeftStartOfSegment, INT quantSpecCoef, INT *pLeftStartOfSegment,
SCHAR *pRemainingBitsInSegment, SCHAR *pRemainingBitsInSegment,
int *pNumDecodedBits) { int *pNumDecodedBits) {
UINT i; UINT i;
@ -1396,7 +1395,7 @@ static INT DecodeEscapeSequence(HANDLE_FDK_BITSTREAM bs, INT quantSpecCoef,
/* decode escape prefix */ /* decode escape prefix */
while (1) { while (1) {
carryBit = HcrGetABitFromBitstream(bs, pLeftStartOfSegment, carryBit = HcrGetABitFromBitstream(bs, bsAnchor, pLeftStartOfSegment,
pLeftStartOfSegment, /* dummy */ pLeftStartOfSegment, /* dummy */
FROM_LEFT_TO_RIGHT); FROM_LEFT_TO_RIGHT);
*pRemainingBitsInSegment -= 1; *pRemainingBitsInSegment -= 1;
@ -1412,7 +1411,7 @@ static INT DecodeEscapeSequence(HANDLE_FDK_BITSTREAM bs, INT quantSpecCoef,
/* decode escape word */ /* decode escape word */
for (i = escapeOnesCounter; i != 0; i--) { for (i = escapeOnesCounter; i != 0; i--) {
carryBit = HcrGetABitFromBitstream(bs, pLeftStartOfSegment, carryBit = HcrGetABitFromBitstream(bs, bsAnchor, pLeftStartOfSegment,
pLeftStartOfSegment, /* dummy */ pLeftStartOfSegment, /* dummy */
FROM_LEFT_TO_RIGHT); FROM_LEFT_TO_RIGHT);
*pRemainingBitsInSegment -= 1; *pRemainingBitsInSegment -= 1;
@ -1441,9 +1440,10 @@ the last of eight function of HCR)
line) line)
-------------------------------------------------------------------------------------------- --------------------------------------------------------------------------------------------
*/ */
static int DecodePCW_Sign(HANDLE_FDK_BITSTREAM bs, UINT codebookDim, static int DecodePCW_Sign(HANDLE_FDK_BITSTREAM bs, const INT bsAnchor,
const SCHAR *pQuantVal, FIXP_DBL *pQuantSpecCoef, UINT codebookDim, const SCHAR *pQuantVal,
int *quantSpecCoefIdx, INT *pLeftStartOfSegment, FIXP_DBL *pQuantSpecCoef, int *quantSpecCoefIdx,
INT *pLeftStartOfSegment,
SCHAR *pRemainingBitsInSegment, SCHAR *pRemainingBitsInSegment,
int *pNumDecodedBits) { int *pNumDecodedBits) {
UINT i; UINT i;
@ -1453,7 +1453,7 @@ static int DecodePCW_Sign(HANDLE_FDK_BITSTREAM bs, UINT codebookDim,
for (i = codebookDim; i != 0; i--) { for (i = codebookDim; i != 0; i--) {
quantSpecCoef = *pQuantVal++; quantSpecCoef = *pQuantVal++;
if (quantSpecCoef != 0) { if (quantSpecCoef != 0) {
carryBit = HcrGetABitFromBitstream(bs, pLeftStartOfSegment, carryBit = HcrGetABitFromBitstream(bs, bsAnchor, pLeftStartOfSegment,
pLeftStartOfSegment, /* dummy */ pLeftStartOfSegment, /* dummy */
FROM_LEFT_TO_RIGHT); FROM_LEFT_TO_RIGHT);
*pRemainingBitsInSegment -= 1; *pRemainingBitsInSegment -= 1;

7
libAACdec/src/aacdec_hcr_bit.cpp
View File

@ -132,13 +132,14 @@ read direction. It is called very often, therefore it makes sense to inline it
return: - bit from bitstream return: - bit from bitstream
-------------------------------------------------------------------------------------------- --------------------------------------------------------------------------------------------
*/ */
UINT HcrGetABitFromBitstream(HANDLE_FDK_BITSTREAM bs, INT *pLeftStartOfSegment, UINT HcrGetABitFromBitstream(HANDLE_FDK_BITSTREAM bs, const INT bsAnchor,
INT *pLeftStartOfSegment,
INT *pRightStartOfSegment, UCHAR readDirection) { INT *pRightStartOfSegment, UCHAR readDirection) {
UINT bit; UINT bit;
INT readBitOffset; INT readBitOffset;
if (readDirection == FROM_LEFT_TO_RIGHT) { if (readDirection == FROM_LEFT_TO_RIGHT) {
readBitOffset = *pLeftStartOfSegment - FDKgetBitCnt(bs); readBitOffset = (INT)FDKgetValidBits(bs) - bsAnchor + *pLeftStartOfSegment;
if (readBitOffset) { if (readBitOffset) {
FDKpushBiDirectional(bs, readBitOffset); FDKpushBiDirectional(bs, readBitOffset);
} }
@ -147,7 +148,7 @@ UINT HcrGetABitFromBitstream(HANDLE_FDK_BITSTREAM bs, INT *pLeftStartOfSegment,
*pLeftStartOfSegment += 1; *pLeftStartOfSegment += 1;
} else { } else {
readBitOffset = *pRightStartOfSegment - FDKgetBitCnt(bs); readBitOffset = (INT)FDKgetValidBits(bs) - bsAnchor + *pRightStartOfSegment;
if (readBitOffset) { if (readBitOffset) {
FDKpushBiDirectional(bs, readBitOffset); FDKpushBiDirectional(bs, readBitOffset);
} }

3
libAACdec/src/aacdec_hcr_bit.h
View File

@ -107,7 +107,8 @@ amm-info@iis.fraunhofer.de
UCHAR ToggleReadDirection(UCHAR readDirection); UCHAR ToggleReadDirection(UCHAR readDirection);
UINT HcrGetABitFromBitstream(HANDLE_FDK_BITSTREAM bs, INT *pLeftStartOfSegment, UINT HcrGetABitFromBitstream(HANDLE_FDK_BITSTREAM bs, const INT bsAnchor,
INT *pLeftStartOfSegment,
INT *pRightStartOfSegment, UCHAR readDirection); INT *pRightStartOfSegment, UCHAR readDirection);
#endif /* AACDEC_HCR_BIT_H */ #endif /* AACDEC_HCR_BIT_H */

2
libAACdec/src/aacdec_hcr_types.h
View File

@ -350,7 +350,7 @@ typedef struct {
SHORT lengthOfReorderedSpectralData; SHORT lengthOfReorderedSpectralData;
SHORT numSection; SHORT numSection;
SHORT *pNumLineInSect; SHORT *pNumLineInSect;
INT bitstreamIndex; INT bitstreamAnchor;
SCHAR lengthOfLongestCodeword; SCHAR lengthOfLongestCodeword;
UCHAR *pCodebook; UCHAR *pCodebook;
} HCR_INPUT_OUTPUT; } HCR_INPUT_OUTPUT;

42
libAACdec/src/aacdec_hcrs.cpp
View File

@ -615,9 +615,9 @@ UINT Hcr_State_BODY_ONLY(HANDLE_FDK_BITSTREAM bs, void *ptr) {
for (; pRemainingBitsInSegment[segmentOffset] > 0; for (; pRemainingBitsInSegment[segmentOffset] > 0;
pRemainingBitsInSegment[segmentOffset] -= 1) { pRemainingBitsInSegment[segmentOffset] -= 1) {
carryBit = HcrGetABitFromBitstream(bs, &pLeftStartOfSegment[segmentOffset], carryBit = HcrGetABitFromBitstream(
&pRightStartOfSegment[segmentOffset], bs, pHcr->decInOut.bitstreamAnchor, &pLeftStartOfSegment[segmentOffset],
readDirection); &pRightStartOfSegment[segmentOffset], readDirection);
CarryBitToBranchValue(carryBit, /* make a step in decoding tree */ CarryBitToBranchValue(carryBit, /* make a step in decoding tree */
treeNode, &branchValue, &branchNode); treeNode, &branchValue, &branchNode);
@ -749,9 +749,9 @@ UINT Hcr_State_BODY_SIGN__BODY(HANDLE_FDK_BITSTREAM bs, void *ptr) {
for (; pRemainingBitsInSegment[segmentOffset] > 0; for (; pRemainingBitsInSegment[segmentOffset] > 0;
pRemainingBitsInSegment[segmentOffset] -= 1) { pRemainingBitsInSegment[segmentOffset] -= 1) {
carryBit = HcrGetABitFromBitstream(bs, &pLeftStartOfSegment[segmentOffset], carryBit = HcrGetABitFromBitstream(
&pRightStartOfSegment[segmentOffset], bs, pHcr->decInOut.bitstreamAnchor, &pLeftStartOfSegment[segmentOffset],
readDirection); &pRightStartOfSegment[segmentOffset], readDirection);
CarryBitToBranchValue(carryBit, /* make a step in decoding tree */ CarryBitToBranchValue(carryBit, /* make a step in decoding tree */
treeNode, &branchValue, &branchNode); treeNode, &branchValue, &branchNode);
@ -884,9 +884,9 @@ UINT Hcr_State_BODY_SIGN__SIGN(HANDLE_FDK_BITSTREAM bs, void *ptr) {
/* loop for sign bit decoding */ /* loop for sign bit decoding */
for (; pRemainingBitsInSegment[segmentOffset] > 0; for (; pRemainingBitsInSegment[segmentOffset] > 0;
pRemainingBitsInSegment[segmentOffset] -= 1) { pRemainingBitsInSegment[segmentOffset] -= 1) {
carryBit = HcrGetABitFromBitstream(bs, &pLeftStartOfSegment[segmentOffset], carryBit = HcrGetABitFromBitstream(
&pRightStartOfSegment[segmentOffset], bs, pHcr->decInOut.bitstreamAnchor, &pLeftStartOfSegment[segmentOffset],
readDirection); &pRightStartOfSegment[segmentOffset], readDirection);
cntSign -= cntSign -=
1; /* decrement sign counter because one sign bit has been read */ 1; /* decrement sign counter because one sign bit has been read */
@ -997,9 +997,9 @@ UINT Hcr_State_BODY_SIGN_ESC__BODY(HANDLE_FDK_BITSTREAM bs, void *ptr) {
for (; pRemainingBitsInSegment[segmentOffset] > 0; for (; pRemainingBitsInSegment[segmentOffset] > 0;
pRemainingBitsInSegment[segmentOffset] -= 1) { pRemainingBitsInSegment[segmentOffset] -= 1) {
carryBit = HcrGetABitFromBitstream(bs, &pLeftStartOfSegment[segmentOffset], carryBit = HcrGetABitFromBitstream(
&pRightStartOfSegment[segmentOffset], bs, pHcr->decInOut.bitstreamAnchor, &pLeftStartOfSegment[segmentOffset],
readDirection); &pRightStartOfSegment[segmentOffset], readDirection);
/* make a step in tree */ /* make a step in tree */
CarryBitToBranchValue(carryBit, treeNode, &branchValue, &branchNode); CarryBitToBranchValue(carryBit, treeNode, &branchValue, &branchNode);
@ -1159,9 +1159,9 @@ UINT Hcr_State_BODY_SIGN_ESC__SIGN(HANDLE_FDK_BITSTREAM bs, void *ptr) {
/* loop for sign bit decoding */ /* loop for sign bit decoding */
for (; pRemainingBitsInSegment[segmentOffset] > 0; for (; pRemainingBitsInSegment[segmentOffset] > 0;
pRemainingBitsInSegment[segmentOffset] -= 1) { pRemainingBitsInSegment[segmentOffset] -= 1) {
carryBit = HcrGetABitFromBitstream(bs, &pLeftStartOfSegment[segmentOffset], carryBit = HcrGetABitFromBitstream(
&pRightStartOfSegment[segmentOffset], bs, pHcr->decInOut.bitstreamAnchor, &pLeftStartOfSegment[segmentOffset],
readDirection); &pRightStartOfSegment[segmentOffset], readDirection);
/* decrement sign counter because one sign bit has been read */ /* decrement sign counter because one sign bit has been read */
cntSign -= 1; cntSign -= 1;
@ -1314,9 +1314,9 @@ UINT Hcr_State_BODY_SIGN_ESC__ESC_PREFIX(HANDLE_FDK_BITSTREAM bs, void *ptr) {
/* decode escape prefix */ /* decode escape prefix */
for (; pRemainingBitsInSegment[segmentOffset] > 0; for (; pRemainingBitsInSegment[segmentOffset] > 0;
pRemainingBitsInSegment[segmentOffset] -= 1) { pRemainingBitsInSegment[segmentOffset] -= 1) {
carryBit = HcrGetABitFromBitstream(bs, &pLeftStartOfSegment[segmentOffset], carryBit = HcrGetABitFromBitstream(
&pRightStartOfSegment[segmentOffset], bs, pHcr->decInOut.bitstreamAnchor, &pLeftStartOfSegment[segmentOffset],
readDirection); &pRightStartOfSegment[segmentOffset], readDirection);
/* count ones and store sum in escapePrefixUp */ /* count ones and store sum in escapePrefixUp */
if (carryBit == 1) { if (carryBit == 1) {
@ -1435,9 +1435,9 @@ UINT Hcr_State_BODY_SIGN_ESC__ESC_WORD(HANDLE_FDK_BITSTREAM bs, void *ptr) {
/* decode escape word */ /* decode escape word */
for (; pRemainingBitsInSegment[segmentOffset] > 0; for (; pRemainingBitsInSegment[segmentOffset] > 0;
pRemainingBitsInSegment[segmentOffset] -= 1) { pRemainingBitsInSegment[segmentOffset] -= 1) {
carryBit = HcrGetABitFromBitstream(bs, &pLeftStartOfSegment[segmentOffset], carryBit = HcrGetABitFromBitstream(
&pRightStartOfSegment[segmentOffset], bs, pHcr->decInOut.bitstreamAnchor, &pLeftStartOfSegment[segmentOffset],
readDirection); &pRightStartOfSegment[segmentOffset], readDirection);
/* build escape word */ /* build escape word */
escapeWord <<= escapeWord <<=

25
libAACdec/src/rvlc.cpp
View File

@ -168,12 +168,13 @@ static void rvlcInit(CErRvlcInfo *pRvlc,
/* set base bitstream ptr to the RVL-coded part (start of RVLC data (ESC 2)) /* set base bitstream ptr to the RVL-coded part (start of RVLC data (ESC 2))
*/ */
FDKsyncCache(bs); FDKsyncCache(bs);
pRvlc->bsAnchor = (INT)FDKgetValidBits(bs);
pRvlc->bitstreamIndexRvlFwd = FDKgetBitCnt( pRvlc->bitstreamIndexRvlFwd =
bs); /* first bit within RVL coded block as start address for forward 0; /* first bit within RVL coded block as start address for forward
decoding */ decoding */
pRvlc->bitstreamIndexRvlBwd = FDKgetBitCnt(bs) + pRvlc->length_of_rvlc_sf - pRvlc->bitstreamIndexRvlBwd =
1; /* last bit within RVL coded block as start pRvlc->length_of_rvlc_sf - 1; /* last bit within RVL coded block as start
address for backward decoding */ address for backward decoding */
/* skip RVLC-bitstream-part -- pointing now to escapes (if present) or to TNS /* skip RVLC-bitstream-part -- pointing now to escapes (if present) or to TNS
@ -183,7 +184,7 @@ static void rvlcInit(CErRvlcInfo *pRvlc,
if (pRvlc->sf_escapes_present != 0) { if (pRvlc->sf_escapes_present != 0) {
/* locate internal bitstream ptr at escapes (which is the second part) */ /* locate internal bitstream ptr at escapes (which is the second part) */
FDKsyncCache(bs); FDKsyncCache(bs);
pRvlc->bitstreamIndexEsc = FDKgetBitCnt(bs); pRvlc->bitstreamIndexEsc = pRvlc->bsAnchor - (INT)FDKgetValidBits(bs);
/* skip escapeRVLC-bitstream-part -- pointing to TNS data (if present) to /* skip escapeRVLC-bitstream-part -- pointing to TNS data (if present) to
* make decoder continue */ * make decoder continue */
@ -259,8 +260,9 @@ static SCHAR rvlcDecodeEscapeWord(CErRvlcInfo *pRvlc, HANDLE_FDK_BITSTREAM bs) {
treeNode = *pEscTree; /* init at starting node */ treeNode = *pEscTree; /* init at starting node */
for (i = MAX_LEN_RVLC_ESCAPE_WORD - 1; i >= 0; i--) { for (i = MAX_LEN_RVLC_ESCAPE_WORD - 1; i >= 0; i--) {
carryBit = rvlcReadBitFromBitstream(bs, /* get next bit */ carryBit =
pBitstreamIndexEsc, FWD); rvlcReadBitFromBitstream(bs, /* get next bit */
pRvlc->bsAnchor, pBitstreamIndexEsc, FWD);
CarryBitToBranchValue(carryBit, /* huffman decoding, do a single step in CarryBitToBranchValue(carryBit, /* huffman decoding, do a single step in
huffman decoding tree */ huffman decoding tree */
@ -370,8 +372,9 @@ SCHAR decodeRVLCodeword(HANDLE_FDK_BITSTREAM bs, CErRvlcInfo *pRvlc) {
UINT treeNode = *pRvlCodeTree; UINT treeNode = *pRvlCodeTree;
for (i = MAX_LEN_RVLC_CODE_WORD - 1; i >= 0; i--) { for (i = MAX_LEN_RVLC_CODE_WORD - 1; i >= 0; i--) {
carryBit = rvlcReadBitFromBitstream(bs, /* get next bit */ carryBit =
pBitstrIndxRvl, direction); rvlcReadBitFromBitstream(bs, /* get next bit */
pRvlc->bsAnchor, pBitstrIndxRvl, direction);
CarryBitToBranchValue(carryBit, /* huffman decoding, do a single step in CarryBitToBranchValue(carryBit, /* huffman decoding, do a single step in
huffman decoding tree */ huffman decoding tree */
@ -1140,7 +1143,7 @@ void CRvlc_Decode(CAacDecoderChannelInfo *pAacDecoderChannelInfo,
rvlcInit(pRvlc, pAacDecoderChannelInfo, bs); rvlcInit(pRvlc, pAacDecoderChannelInfo, bs);
/* save bitstream position */ /* save bitstream position */
saveBitCnt = FDKgetBitCnt(bs); saveBitCnt = (INT)FDKgetValidBits(bs);
if (pRvlc->sf_escapes_present) if (pRvlc->sf_escapes_present)
rvlcDecodeEscapes( rvlcDecodeEscapes(
@ -1155,7 +1158,7 @@ void CRvlc_Decode(CAacDecoderChannelInfo *pAacDecoderChannelInfo,
pAacDecoderChannelInfo->data.aac.PnsData.PnsActive = pRvlc->noise_used; pAacDecoderChannelInfo->data.aac.PnsData.PnsActive = pRvlc->noise_used;
/* restore bitstream position */ /* restore bitstream position */
bitCntOffst = saveBitCnt - FDKgetBitCnt(bs); bitCntOffst = (INT)FDKgetValidBits(bs) - saveBitCnt;
if (bitCntOffst) { if (bitCntOffst) {
FDKpushBiDirectional(bs, bitCntOffst); FDKpushBiDirectional(bs, bitCntOffst);
} }

1
libAACdec/src/rvlc_info.h
View File

@ -164,6 +164,7 @@ typedef struct {
UCHAR direction; UCHAR direction;
/* bitstream indices */ /* bitstream indices */
INT bsAnchor; /* hcr bit buffer reference index */
INT bitstreamIndexRvlFwd; /* base address of RVL-coded-scalefactor data (ESC INT bitstreamIndexRvlFwd; /* base address of RVL-coded-scalefactor data (ESC
2) for forward decoding */ 2) for forward decoding */
INT bitstreamIndexRvlBwd; /* base address of RVL-coded-scalefactor data (ESC INT bitstreamIndexRvlBwd; /* base address of RVL-coded-scalefactor data (ESC

6
libAACdec/src/rvlcbit.cpp
View File

@ -123,10 +123,10 @@ read direction. It is called very often, therefore it makes sense to inline it
-------------------------------------------------------------------------------------------- --------------------------------------------------------------------------------------------
*/ */
UCHAR rvlcReadBitFromBitstream(HANDLE_FDK_BITSTREAM bs, INT *pPosition, UCHAR rvlcReadBitFromBitstream(HANDLE_FDK_BITSTREAM bs, const INT bsAnchor,
UCHAR readDirection) { INT *pPosition, UCHAR readDirection) {
UINT bit; UINT bit;
INT readBitOffset = *pPosition - FDKgetBitCnt(bs); INT readBitOffset = (INT)FDKgetValidBits(bs) - bsAnchor + *pPosition;
if (readBitOffset) { if (readBitOffset) {
FDKpushBiDirectional(bs, readBitOffset); FDKpushBiDirectional(bs, readBitOffset);

4
libAACdec/src/rvlcbit.h
View File

@ -105,7 +105,7 @@ amm-info@iis.fraunhofer.de
#include "rvlc.h" #include "rvlc.h"
UCHAR rvlcReadBitFromBitstream(HANDLE_FDK_BITSTREAM bs, INT *pPosition, UCHAR rvlcReadBitFromBitstream(HANDLE_FDK_BITSTREAM bs, const INT bsAnchor,
UCHAR readDirection); INT *pPosition, UCHAR readDirection);
#endif /* RVLCBIT_H */ #endif /* RVLCBIT_H */

6
libFDK/include/FDK_bitbuffer.h
View File

@ -113,7 +113,6 @@ typedef struct {
UINT ValidBits; UINT ValidBits;
UINT ReadOffset; UINT ReadOffset;
UINT WriteOffset; UINT WriteOffset;
UINT BitCnt;
UINT BitNdx; UINT BitNdx;
UCHAR *Buffer; UCHAR *Buffer;
@ -159,15 +158,10 @@ void FDK_pushBack(HANDLE_FDK_BITBUF hBitBuffer, const UINT numberOfBits,
void FDK_pushForward(HANDLE_FDK_BITBUF hBitBuffer, const UINT numberOfBits, void FDK_pushForward(HANDLE_FDK_BITBUF hBitBuffer, const UINT numberOfBits,
UCHAR config); UCHAR config);
void FDK_byteAlign(HANDLE_FDK_BITBUF hBitBuffer, UCHAR config);
UINT FDK_getValidBits(HANDLE_FDK_BITBUF hBitBuffer); UINT FDK_getValidBits(HANDLE_FDK_BITBUF hBitBuffer);
INT FDK_getFreeBits(HANDLE_FDK_BITBUF hBitBuffer); INT FDK_getFreeBits(HANDLE_FDK_BITBUF hBitBuffer);
void FDK_setBitCnt(HANDLE_FDK_BITBUF hBitBuffer, const UINT value);
INT FDK_getBitCnt(HANDLE_FDK_BITBUF hBitBuffer);
void FDK_Feed(HANDLE_FDK_BITBUF hBitBuffer, const UCHAR inputBuffer[], void FDK_Feed(HANDLE_FDK_BITBUF hBitBuffer, const UCHAR inputBuffer[],
const UINT bufferSize, UINT *bytesValid); const UINT bufferSize, UINT *bytesValid);

46
libFDK/include/FDK_bitstream.h
View File

@ -480,21 +480,6 @@ FDK_INLINE void FDKsyncCacheBwd(HANDLE_FDK_BITSTREAM hBitStream) {
hBitStream->CacheWord = 0; hBitStream->CacheWord = 0;
} }
/**
* \brief Byte Alignment Function.
* This function performs the byte_alignment() syntactic function on the
* input stream, i.e. some bits will be discarded/padded so that the next bits
* to be read/written will be aligned on a byte boundary with respect to
* the bit position 0.
*
* \param hBitStream HANDLE_FDK_BITSTREAM handle
* \return void
*/
FDK_INLINE void FDKbyteAlign(HANDLE_FDK_BITSTREAM hBitStream) {
FDKsyncCache(hBitStream);
FDK_byteAlign(&hBitStream->hBitBuf, (UCHAR)hBitStream->ConfigCache);
}
/** /**
* \brief Byte Alignment Function with anchor * \brief Byte Alignment Function with anchor
* This function performs the byte_alignment() syntactic function on the * This function performs the byte_alignment() syntactic function on the
@ -603,37 +588,6 @@ FDK_INLINE INT FDKgetFreeBits(HANDLE_FDK_BITSTREAM hBitStream) {
return FDK_getFreeBits(&hBitStream->hBitBuf); return FDK_getFreeBits(&hBitStream->hBitBuf);
} }
/**
* \brief reset bitcounter in bitBuffer to zero.
* \param hBitStream HANDLE_FDK_BITSTREAM handle
* \return void
*/
FDK_INLINE void FDKresetBitCnt(HANDLE_FDK_BITSTREAM hBitStream) {
FDKsyncCache(hBitStream);
FDK_setBitCnt(&hBitStream->hBitBuf, 0);
}
/**
* \brief set bitcoutner in bitBuffer to given value.
* \param hBitStream HANDLE_FDK_BITSTREAM handle
* \param value new value to be assigned to the bit counter
* \return void
*/
FDK_INLINE void FDKsetBitCnt(HANDLE_FDK_BITSTREAM hBitStream, UINT value) {
FDKsyncCache(hBitStream);
FDK_setBitCnt(&hBitStream->hBitBuf, value);
}
/**
* \brief get bitcounter state from bitBuffer.
* \param hBitStream HANDLE_FDK_BITSTREAM handle
* \return current bit counter value
*/
FDK_INLINE INT FDKgetBitCnt(HANDLE_FDK_BITSTREAM hBitStream) {
FDKsyncCache(hBitStream);
return FDK_getBitCnt(&hBitStream->hBitBuf);
}
/** /**
* \brief Fill the BitBuffer with a number of input bytes from external source. * \brief Fill the BitBuffer with a number of input bytes from external source.
* The bytesValid variable returns the number of ramaining valid bytes in * The bytesValid variable returns the number of ramaining valid bytes in

29
libFDK/src/FDK_bitbuffer.cpp
View File

@ -128,7 +128,6 @@ void FDK_InitBitBuffer(HANDLE_FDK_BITBUF hBitBuf, UCHAR *pBuffer, UINT bufSize,
hBitBuf->ValidBits = validBits; hBitBuf->ValidBits = validBits;
hBitBuf->ReadOffset = 0; hBitBuf->ReadOffset = 0;
hBitBuf->WriteOffset = 0; hBitBuf->WriteOffset = 0;
hBitBuf->BitCnt = 0;
hBitBuf->BitNdx = 0; hBitBuf->BitNdx = 0;
hBitBuf->Buffer = pBuffer; hBitBuf->Buffer = pBuffer;
@ -151,7 +150,6 @@ void FDK_ResetBitBuffer(HANDLE_FDK_BITBUF hBitBuf) {
hBitBuf->ValidBits = 0; hBitBuf->ValidBits = 0;
hBitBuf->ReadOffset = 0; hBitBuf->ReadOffset = 0;
hBitBuf->WriteOffset = 0; hBitBuf->WriteOffset = 0;
hBitBuf->BitCnt = 0;
hBitBuf->BitNdx = 0; hBitBuf->BitNdx = 0;
} }
@ -161,7 +159,6 @@ INT FDK_get(HANDLE_FDK_BITBUF hBitBuf, const UINT numberOfBits) {
UINT bitOffset = hBitBuf->BitNdx & 0x07; UINT bitOffset = hBitBuf->BitNdx & 0x07;
hBitBuf->BitNdx = (hBitBuf->BitNdx + numberOfBits) & (hBitBuf->bufBits - 1); hBitBuf->BitNdx = (hBitBuf->BitNdx + numberOfBits) & (hBitBuf->bufBits - 1);
hBitBuf->BitCnt += numberOfBits;
hBitBuf->ValidBits -= numberOfBits; hBitBuf->ValidBits -= numberOfBits;
UINT byteMask = hBitBuf->bufSize - 1; UINT byteMask = hBitBuf->bufSize - 1;
@ -184,7 +181,6 @@ INT FDK_get(HANDLE_FDK_BITBUF hBitBuf, const UINT numberOfBits) {
INT FDK_get32(HANDLE_FDK_BITBUF hBitBuf) { INT FDK_get32(HANDLE_FDK_BITBUF hBitBuf) {
UINT BitNdx = hBitBuf->BitNdx + 32; UINT BitNdx = hBitBuf->BitNdx + 32;
hBitBuf->BitNdx = BitNdx & (hBitBuf->bufBits - 1); hBitBuf->BitNdx = BitNdx & (hBitBuf->bufBits - 1);
hBitBuf->BitCnt += 32;
hBitBuf->ValidBits = (UINT)((INT)hBitBuf->ValidBits - (INT)32); hBitBuf->ValidBits = (UINT)((INT)hBitBuf->ValidBits - (INT)32);
UINT byteOffset = (BitNdx - 1) >> 3; UINT byteOffset = (BitNdx - 1) >> 3;
@ -223,7 +219,6 @@ INT FDK_getBwd(HANDLE_FDK_BITBUF hBitBuf, const UINT numberOfBits) {
int i; int i;
hBitBuf->BitNdx = (hBitBuf->BitNdx - numberOfBits) & (hBitBuf->bufBits - 1); hBitBuf->BitNdx = (hBitBuf->BitNdx - numberOfBits) & (hBitBuf->bufBits - 1);
hBitBuf->BitCnt -= numberOfBits;
hBitBuf->ValidBits += numberOfBits; hBitBuf->ValidBits += numberOfBits;
UINT tx = hBitBuf->Buffer[(byteOffset - 3) & byteMask] << 24 | UINT tx = hBitBuf->Buffer[(byteOffset - 3) & byteMask] << 24 |
@ -256,7 +251,6 @@ void FDK_put(HANDLE_FDK_BITBUF hBitBuf, UINT value, const UINT numberOfBits) {
UINT bitOffset = hBitBuf->BitNdx & 0x7; UINT bitOffset = hBitBuf->BitNdx & 0x7;
hBitBuf->BitNdx = (hBitBuf->BitNdx + numberOfBits) & (hBitBuf->bufBits - 1); hBitBuf->BitNdx = (hBitBuf->BitNdx + numberOfBits) & (hBitBuf->bufBits - 1);
hBitBuf->BitCnt += numberOfBits;
hBitBuf->ValidBits += numberOfBits; hBitBuf->ValidBits += numberOfBits;
UINT byteMask = hBitBuf->bufSize - 1; UINT byteMask = hBitBuf->bufSize - 1;
@ -307,7 +301,6 @@ void FDK_putBwd(HANDLE_FDK_BITBUF hBitBuf, UINT value,
int i; int i;
hBitBuf->BitNdx = (hBitBuf->BitNdx - numberOfBits) & (hBitBuf->bufBits - 1); hBitBuf->BitNdx = (hBitBuf->BitNdx - numberOfBits) & (hBitBuf->bufBits - 1);
hBitBuf->BitCnt -= numberOfBits;
hBitBuf->ValidBits -= numberOfBits; hBitBuf->ValidBits -= numberOfBits;
/* in place turn around */ /* in place turn around */
@ -344,7 +337,6 @@ void FDK_putBwd(HANDLE_FDK_BITBUF hBitBuf, UINT value,
#ifndef FUNCTION_FDK_pushBack #ifndef FUNCTION_FDK_pushBack
void FDK_pushBack(HANDLE_FDK_BITBUF hBitBuf, const UINT numberOfBits, void FDK_pushBack(HANDLE_FDK_BITBUF hBitBuf, const UINT numberOfBits,
UCHAR config) { UCHAR config) {
hBitBuf->BitCnt = (UINT)((INT)hBitBuf->BitCnt - (INT)numberOfBits);
hBitBuf->ValidBits = hBitBuf->ValidBits =
(config == 0) ? (UINT)((INT)hBitBuf->ValidBits + (INT)numberOfBits) (config == 0) ? (UINT)((INT)hBitBuf->ValidBits + (INT)numberOfBits)
: ((UINT)((INT)hBitBuf->ValidBits - (INT)numberOfBits)); : ((UINT)((INT)hBitBuf->ValidBits - (INT)numberOfBits));
@ -355,7 +347,6 @@ void FDK_pushBack(HANDLE_FDK_BITBUF hBitBuf, const UINT numberOfBits,
void FDK_pushForward(HANDLE_FDK_BITBUF hBitBuf, const UINT numberOfBits, void FDK_pushForward(HANDLE_FDK_BITBUF hBitBuf, const UINT numberOfBits,
UCHAR config) { UCHAR config) {
hBitBuf->BitCnt = (UINT)((INT)hBitBuf->BitCnt + (INT)numberOfBits);
hBitBuf->ValidBits = hBitBuf->ValidBits =
(config == 0) ? ((UINT)((INT)hBitBuf->ValidBits - (INT)numberOfBits)) (config == 0) ? ((UINT)((INT)hBitBuf->ValidBits - (INT)numberOfBits))
: (UINT)((INT)hBitBuf->ValidBits + (INT)numberOfBits); : (UINT)((INT)hBitBuf->ValidBits + (INT)numberOfBits);
@ -363,19 +354,6 @@ void FDK_pushForward(HANDLE_FDK_BITBUF hBitBuf, const UINT numberOfBits,
(UINT)((INT)hBitBuf->BitNdx + (INT)numberOfBits) & (hBitBuf->bufBits - 1); (UINT)((INT)hBitBuf->BitNdx + (INT)numberOfBits) & (hBitBuf->bufBits - 1);
} }
void FDK_byteAlign(HANDLE_FDK_BITBUF hBitBuf, UCHAR config) {
INT alignment = hBitBuf->BitCnt & 0x07;
if (alignment) {
if (config == 0)
FDK_pushForward(hBitBuf, 8 - alignment, config); /* BS_READER */
else
FDK_put(hBitBuf, 0, 8 - alignment); /* BS_WRITER */
}
hBitBuf->BitCnt = 0;
}
#ifndef FUNCTION_FDK_getValidBits #ifndef FUNCTION_FDK_getValidBits
UINT FDK_getValidBits(HANDLE_FDK_BITBUF hBitBuf) { return hBitBuf->ValidBits; } UINT FDK_getValidBits(HANDLE_FDK_BITBUF hBitBuf) { return hBitBuf->ValidBits; }
#endif /* #ifndef FUNCTION_FDK_getValidBits */ #endif /* #ifndef FUNCTION_FDK_getValidBits */
@ -384,12 +362,6 @@ INT FDK_getFreeBits(HANDLE_FDK_BITBUF hBitBuf) {
return (hBitBuf->bufBits - hBitBuf->ValidBits); return (hBitBuf->bufBits - hBitBuf->ValidBits);
} }
void FDK_setBitCnt(HANDLE_FDK_BITBUF hBitBuf, const UINT value) {
hBitBuf->BitCnt = value;
}
INT FDK_getBitCnt(HANDLE_FDK_BITBUF hBitBuf) { return hBitBuf->BitCnt; }
void FDK_Feed(HANDLE_FDK_BITBUF hBitBuf, const UCHAR *RESTRICT inputBuffer, void FDK_Feed(HANDLE_FDK_BITBUF hBitBuf, const UCHAR *RESTRICT inputBuffer,
const UINT bufferSize, UINT *bytesValid) { const UINT bufferSize, UINT *bytesValid) {
inputBuffer = &inputBuffer[bufferSize - *bytesValid]; inputBuffer = &inputBuffer[bufferSize - *bytesValid];
@ -438,7 +410,6 @@ void CopyAlignedBlock(HANDLE_FDK_BITBUF h_BitBufSrc, UCHAR *RESTRICT dstBuffer,
h_BitBufSrc->BitNdx = h_BitBufSrc->BitNdx =
(h_BitBufSrc->BitNdx + bToRead) & (h_BitBufSrc->bufBits - 1); (h_BitBufSrc->BitNdx + bToRead) & (h_BitBufSrc->bufBits - 1);
h_BitBufSrc->BitCnt += bToRead;
h_BitBufSrc->ValidBits -= bToRead; h_BitBufSrc->ValidBits -= bToRead;
} }