mp3enc_layer3.cpp

这是在PCA下的基于IPP库示例代码例子,在网上下了IPP的库之后,设置相关参数就可以编译该代码.

/*//////////////////////////////////////////////////////////////////////////////
//
//                  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) 2002-2005 Intel Corporation. All Rights Reserved.
//
*/

#include "umc_mp3_enc_int.h"

namespace UMC {

  int MP3EncoderInt::huffamInit()
  {
    int     i;

    htables[0].linbits = 0;
    htables[1].linbits = 0;
    htables[2].linbits = 0;
    htables[3].linbits = 0;
    htables[4].linbits = 0;
    htables[5].linbits = 0;
    htables[6].linbits = 0;
    htables[7].linbits = 0;
    htables[8].linbits = 0;
    htables[9].linbits = 0;
    htables[10].linbits = 0;
    htables[11].linbits = 0;
    htables[12].linbits = 0;
    htables[13].linbits = 0;
    htables[14].linbits = 0;
    htables[15].linbits = 0;
    htables[16].linbits = 1;
    htables[17].linbits = 2;
    htables[18].linbits = 3;
    htables[19].linbits = 4;
    htables[20].linbits = 6;
    htables[21].linbits = 8;
    htables[22].linbits = 10;
    htables[23].linbits = 13;
    htables[24].linbits = 4;
    htables[25].linbits = 5;
    htables[26].linbits = 6;
    htables[27].linbits = 7;
    htables[28].linbits = 8;
    htables[29].linbits = 9;
    htables[30].linbits = 11;
    htables[31].linbits = 13;

    for (i = 0; i < 32; i++) {
      htables[i].phuftable = NULL;
    }

    for (i = 15; i < 32; i++) {
      htables[i].mav_value = 15 + ((1 << htables[i].linbits) - 1);
    }

    for (i = 1; i <= 16; i++) {
      if (mp3enc_VLCBooks[i]) {
        ippsVLCEncodeInitAlloc_32s(mp3enc_VLCBooks[i],
                                   mp3enc_VLCTableSizes[i],
                                   (IppsVLCEncodeSpec_32s**)(&htables[i].phuftable));
      }
    }

    for (i = 17; i < 24; i++) {
      htables[i].phuftable = htables[16].phuftable;
    }

    ippsVLCEncodeInitAlloc_32s(mp3enc_VLCBooks[24],
                               mp3enc_VLCTableSizes[24],
                               (IppsVLCEncodeSpec_32s**)(&htables[24].phuftable));
    for (i = 25; i < 32; i++) {
      htables[i].phuftable = htables[24].phuftable;
    }

    return 1;
  }
};      // namespace UMC