shithub: openh264

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Unify the fallback codepath for getting prefix bits into a macro

This avoids having to know the details about when the optimized
codepath is available at the place where it's used.

--- a/codec/decoder/core/inc/vlc_decoder.h

+++ b/codec/decoder/core/inc/vlc_decoder.h

@@ -102,15 +102,18 @@

 extern const uint8_t g_kuiZeroLeftTable6[8][2];

 extern const uint8_t g_kuiZeroLeftBitNumMap[16];

-#ifdef WIN32

+#if defined(_MSC_VER) && defined(_M_IX86)

 //TODO need linux version

 #define WELS_GET_PREFIX_BITS(inval,outval){\

+	uint32_t local = inval;\

 	__asm xor		eax,	eax\

-	__asm bsr		eax,	inval\

+	__asm bsr		eax,	local\

 	__asm sub		eax,	32\

 	__asm neg		eax\

 	__asm mov		outval,	eax\

 }

+#else

+#define WELS_GET_PREFIX_BITS(inval, outval) outval = GetPrefixBits(inval)

 #endif

 static inline void_t InitVlcTable (SVlcTable* pVlcTable) {

--- a/codec/decoder/core/src/parse_mb_syn_cavlc.cpp

+++ b/codec/decoder/core/src/parse_mb_syn_cavlc.cpp

@@ -537,7 +537,6 @@

                                  uint8_t uiTrailingOnes) {

   int32_t i, iUsedBits = 0;

   int32_t iSuffixLength, iSuffixLengthSize, iLevelPrefix, iPrefixBits, iLevelCode, iThreshold;

-  uint32_t uiCache32Bit;

   for (i = 0; i < uiTrailingOnes; i++) {

     iLevel[i] = 1 - ((pBitsCache->uiCache32Bit >> (30 - i)) & 0x02);

   }

@@ -548,12 +547,7 @@

   for (; i < uiTotalCoeff; i++) {

     if (pBitsCache->uiRemainBits <= 16)		SHIFT_BUFFER (pBitsCache);

-#if defined(_MSC_VER) && defined(_M_IX86)

-    uiCache32Bit = pBitsCache->uiCache32Bit;

-    WELS_GET_PREFIX_BITS (uiCache32Bit, iPrefixBits);

-#else

-    iPrefixBits = GetPrefixBits (pBitsCache->uiCache32Bit);

-#endif

+    WELS_GET_PREFIX_BITS (pBitsCache->uiCache32Bit, iPrefixBits);

     POP_BUFFER (pBitsCache, iPrefixBits);

     iUsedBits   += iPrefixBits;

     iLevelPrefix = iPrefixBits - 1;