1 files changed, 173 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/aacenc/src/bitbuffer.c b/media/libstagefright/codecs/aacenc/src/bitbuffer.c
new file mode 100644
index 0000000..0ce93d3
--- /dev/null
+++ b/media/libstagefright/codecs/aacenc/src/bitbuffer.c
@@ -0,0 +1,173 @@
+/*
+ ** Copyright 2003-2010, VisualOn, Inc.
+ **
+ ** Licensed under the Apache License, Version 2.0 (the "License");
+ ** you may not use this file except in compliance with the License.
+ ** You may obtain a copy of the License at
+ **
+ **     http://www.apache.org/licenses/LICENSE-2.0
+ **
+ ** Unless required by applicable law or agreed to in writing, software
+ ** distributed under the License is distributed on an "AS IS" BASIS,
+ ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ ** See the License for the specific language governing permissions and
+ ** limitations under the License.
+ */
+/*******************************************************************************
+	File:		bitbuffer.c
+
+	Content:	Bit Buffer Management functions
+
+*******************************************************************************/
+
+#include "bitbuffer.h"
+
+/*****************************************************************************
+*
+* function name: updateBitBufWordPtr
+* description:  update Bit Buffer pointer
+*
+*****************************************************************************/
+static void updateBitBufWordPtr(HANDLE_BIT_BUF hBitBuf,
+                                UWord8 **pBitBufWord,
+                                Word16   cnt)
+{
+  *pBitBufWord += cnt;
+
+
+  if(*pBitBufWord > hBitBuf->pBitBufEnd) {
+    *pBitBufWord -= (hBitBuf->pBitBufEnd - hBitBuf->pBitBufBase + 1);
+  }
+
+  if(*pBitBufWord < hBitBuf->pBitBufBase) {
+    *pBitBufWord += (hBitBuf->pBitBufEnd - hBitBuf->pBitBufBase + 1);
+  }
+}
+
+
+/*****************************************************************************
+*
+* function name: CreateBitBuffer
+* description:  create and init Bit Buffer Management
+*
+*****************************************************************************/
+HANDLE_BIT_BUF CreateBitBuffer(HANDLE_BIT_BUF hBitBuf,
+                               UWord8 *pBitBufBase,
+                               Word16  bitBufSize)
+{
+  assert(bitBufSize*8 <= 32768);
+
+  hBitBuf->pBitBufBase = pBitBufBase;
+  hBitBuf->pBitBufEnd  = pBitBufBase + bitBufSize - 1;
+
+  hBitBuf->pWriteNext  = pBitBufBase;
+
+  hBitBuf->cache       = 0;
+
+  hBitBuf->wBitPos     = 0;
+  hBitBuf->cntBits     = 0;
+
+  hBitBuf->size        = (bitBufSize << 3);
+  hBitBuf->isValid     = 1;
+
+  return hBitBuf;
+}
+
+/*****************************************************************************
+*
+* function name: DeleteBitBuffer
+* description:  uninit Bit Buffer Management
+*
+*****************************************************************************/
+void DeleteBitBuffer(HANDLE_BIT_BUF *hBitBuf)
+{
+  if(*hBitBuf)
+	(*hBitBuf)->isValid = 0;
+  *hBitBuf = NULL;
+}
+
+/*****************************************************************************
+*
+* function name: ResetBitBuf
+* description:  reset Bit Buffer Management
+*
+*****************************************************************************/
+void ResetBitBuf(HANDLE_BIT_BUF hBitBuf,
+                 UWord8 *pBitBufBase,
+                 Word16  bitBufSize)
+{
+  hBitBuf->pBitBufBase = pBitBufBase;
+  hBitBuf->pBitBufEnd  = pBitBufBase + bitBufSize - 1;
+
+
+  hBitBuf->pWriteNext  = pBitBufBase;
+
+  hBitBuf->wBitPos     = 0;
+  hBitBuf->cntBits     = 0;
+
+  hBitBuf->cache	   = 0;
+}
+
+/*****************************************************************************
+*
+* function name: CopyBitBuf
+* description:  copy Bit Buffer Management
+*
+*****************************************************************************/
+void CopyBitBuf(HANDLE_BIT_BUF hBitBufSrc,
+                HANDLE_BIT_BUF hBitBufDst)
+{
+  *hBitBufDst = *hBitBufSrc;
+}
+
+/*****************************************************************************
+*
+* function name: GetBitsAvail
+* description:  get available bits
+*
+*****************************************************************************/
+Word16 GetBitsAvail(HANDLE_BIT_BUF hBitBuf)
+{
+  return hBitBuf->cntBits;
+}
+
+/*****************************************************************************
+*
+* function name: WriteBits
+* description:  write bits to the buffer
+*
+*****************************************************************************/
+Word16 WriteBits(HANDLE_BIT_BUF hBitBuf,
+                 UWord32 writeValue,
+                 Word16 noBitsToWrite)
+{
+  Word16 wBitPos;
+
+  assert(noBitsToWrite <= (Word16)sizeof(Word32)*8);
+
+  if(noBitsToWrite == 0)
+	  return noBitsToWrite;
+
+  hBitBuf->cntBits += noBitsToWrite;
+
+  wBitPos = hBitBuf->wBitPos;
+  wBitPos += noBitsToWrite;
+  writeValue &= ~(0xffffffff << noBitsToWrite); // Mask out everything except the lowest noBitsToWrite bits
+  writeValue <<= 32 - wBitPos;
+  writeValue |= hBitBuf->cache;
+
+  while (wBitPos >= 8)
+  {
+	  UWord8 tmp;
+	  tmp = (UWord8)((writeValue >> 24) & 0xFF);
+
+	  *hBitBuf->pWriteNext++ = tmp;
+	  writeValue <<= 8;
+	  wBitPos -= 8;
+  }
+
+  hBitBuf->wBitPos = wBitPos;
+  hBitBuf->cache = writeValue;
+
+  return noBitsToWrite;
+}