h261_enc_bitstream.cpp

audio-video-codecs.rar语音编解码器

/* ///////////////////////////////////////////////////////////////////////
//
//               INTEL CORPORATION PROPRIETARY INFORMATION
//  This software is supplied under the terms of a license agreement or
//  nondisclosure agreement with Intel Corporation and may not be copied
//  or disclosed except in accordance with the terms of that agreement.
//        Copyright (c) 2005-2007 Intel Corporation. All Rights Reserved.
//
//  Description:    class ippBitStreamH
//
*/

#include "h261_enc_bitstream.hpp"

#if /*(_WIN32_WCE == 500) && */(_MSC_VER == 1201)
// INTERNAL COMPILER ERROR
#pragma optimize ("g", off)
#endif

void ippBitStreamH::PutBits(Ipp32u val, Ipp32s n)
{
  val <<= 32 - n;
  if (mBitOff == 0) {
    mPtr[0] = (Ipp8u)(val >> 24);
    if (n > 8) {
      mPtr[1] = (Ipp8u)(val >> 16);
      if (n > 16) {
        mPtr[2] = (Ipp8u)(val >> 8);
        if (n > 24) {
          mPtr[3] = (Ipp8u)(val);
        }
      }
    }
  } else {
    mPtr[0] = (Ipp8u)((mPtr[0] & (0xFF << (8 - mBitOff))) | (Ipp8u)(val >> (24 + mBitOff)));
    if (n > 8 - mBitOff) {
      val <<= 8 - mBitOff;
      mPtr[1] = (Ipp8u)(val >> 24);
      if (n > 16 - mBitOff) {
        mPtr[2] = (Ipp8u)(val >> 16);
        if (n > 24 - mBitOff) {
          mPtr[3] = (Ipp8u)(val >> 8);
          if (n > 32 - mBitOff) {
            mPtr[4] = (Ipp8u)val;
          }
        }
      }
    }
  }
  mPtr += (mBitOff + n) >> 3;
  mBitOff = (mBitOff + n) & 7;
}