Initial Commit

2013-12-09 04:51:09 -08:00
parent bd509b2245
commit 70e5e62f3d
308 changed files with 97100 additions and 0 deletions
--- a/codec/decoder/core/src/bit_stream.cpp
+++ b/codec/decoder/core/src/bit_stream.cpp
@@ -0,0 +1,123 @@
+/*!
+ * \copy
+ *     Copyright (c)  2009-2013, Cisco Systems
+ *     All rights reserved.
+ *
+ *     Redistribution and use in source and binary forms, with or without
+ *     modification, are permitted provided that the following conditions
+ *     are met:
+ *
+ *        * Redistributions of source code must retain the above copyright
+ *          notice, this list of conditions and the following disclaimer.
+ *
+ *        * Redistributions in binary form must reproduce the above copyright
+ *          notice, this list of conditions and the following disclaimer in
+ *          the documentation and/or other materials provided with the
+ *          distribution.
+ *
+ *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *     "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *     LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ *     FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ *     COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ *     INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ *     BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ *     CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ *     LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ *     ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ *     POSSIBILITY OF SUCH DAMAGE.
+ *
+ *
+ * \file	bit_stream.cpp
+ *
+ * \brief	Reading / writing bit-stream
+ *
+ * \date	03/10/2009 Created
+ *
+ *************************************************************************************
+ */
+#include "bit_stream.h"
+#include "macros.h"
+
+namespace WelsDec {
+
+#ifdef WORDS_BIGENDIAN
+inline uint32_t EndianFix(uint32_t uiX)
+{
+	return uiX;
+}
+#else //WORDS_BIGENDIAN
+
+#ifdef _MSC_VER
+inline uint32_t EndianFix(uint32_t uiX)
+{
+	__asm
+	{
+		mov   eax,  uiX
+		bswap   eax
+		mov   uiX,    eax
+	}
+	return uiX;
+}
+#else  //_MSC_VER
+
+inline uint32_t EndianFix(uint32_t uiX)
+{
+#ifdef ARM_ARCHv7
+	__asm__ __volatile__("rev %0, %0":"+r"(uiX)); //Just for the ARMv7 
+#elif defined (X86_ARCH)
+	__asm__ __volatile__("bswap %0":"+r"(uiX));
+#else
+    uiX = ((uiX & 0xff000000)>> 24) | ((uiX & 0xff0000) >> 8) |
+        ((uiX & 0xff00) << 8) | ((uiX&0xff) << 24);
+#endif	
+	return uiX;
+}
+#endif //_MSC_VER
+
+#endif //WORDS_BIGENDIAN
+
+inline uint32_t GetValue4Bytes( uint8_t* pDstNal )
+{
+	uint32_t uiValue = 0;
+	uiValue = (pDstNal[0]<<24) | (pDstNal[1]<<16) | (pDstNal[2]<<8) | (pDstNal[3]);
+	return uiValue;
+}
+
+void_t InitReadBits( PBitStringAux pBitString )
+{
+	pBitString->uiCurBits  = GetValue4Bytes( pBitString->pCurBuf );
+	pBitString->pCurBuf  += 4;
+	pBitString->iLeftBits = -16;
+}
+
+/*!
+ * \brief	input bits for decoder or initialize bitstream writing in encoder
+ *
+ * \param	pBitString	Bit string auxiliary pointer
+ * \param	kpBuf		bit-stream buffer
+ * \param	kiSize	    size in bits for decoder; size in bytes for encoder
+ *
+ * \return	size of buffer data in byte; failed in -1 return
+ */
+int32_t InitBits( PBitStringAux pBitString, const uint8_t *kpBuf, const int32_t kiSize )
+{	
+	const int32_t kiSizeBuf = (kiSize + 7) >> 3;
+	uint8_t *pTmp = (uint8_t *)kpBuf;
+
+	if ( NULL == pTmp )
+		return -1;
+
+	pBitString->pStartBuf   = pTmp;				// buffer to start position
+	pBitString->pEndBuf	    = pTmp + kiSizeBuf;	// buffer + length
+	pBitString->iBits	    = kiSize;				// count bits of overall bitstreaming inputindex;
+
+	pBitString->pCurBuf   = pBitString->pStartBuf;
+	InitReadBits( pBitString );
+
+	return kiSizeBuf;
+}
+
+} // namespace WelsDec
+