mp3dec_layer3_int.c

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.

            /* short bloks */
            {  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,
               4,  4,  6,  6,  6,  8,  8,  8, 12, 12,
              12, 16, 16, 16, 20, 20, 20, 26, 26, 26,
              34, 34, 34, 42, 42, 42, 12, 12, 12
            },
            /* mixed bloks */
            {  4,  4,  4,  4,  4,  4,  6,  6,  4,  4,
               4,  6,  6,  6,  8,  8,  8, 12, 12, 12,
              16, 16, 16, 20, 20, 20, 26, 26, 26, 34,
              34, 34, 42, 42, 42, 12, 12, 12
            }
        }
    }
};

static const int sfBandNum[2][3][2] =
{
    { /* MPEG 2 */
        {22, 0}, {0, 13}, {6, 10}
    },
    { /* MPEG 1 */
        {22, 0}, {0, 13}, {8, 10}
    }
};
/* Q30 */
static const int mpeg1_intensity[7] = {
           0,   226908352,   393016800,   536870912,
   680725056,   846833472,  1073741824,
};

/* Q30 */
static const int mpeg2_intensity[2][16] =
{
    {
      1073741824, 902905664, 759250112, 638450688,
       536870912, 451452832, 379625056, 319225344,
       268435456, 225726416, 189812528, 159612672,
       134217728, 112863208,  94906264,  79806336,
    },
    {
      1073741824, 759250112, 536870912, 379625056,
       268435456, 189812528, 134217728,  94906264,
        67108864,  47453132,  33554432,  23726566,
        16777216,  11863283,   8388608,   5931642,
    }
};

/* Table 3-B.6. Layer III Preemphasis (p.14 Annex_AB ISO/IEC 11172-3 )*/
static short pretab[22] = {
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 3, 3, 2, 0
};

/* Table 3-B.9  Layer III coefficients for aliasing reduction (p.36 Annex_AB ISO/IEC 11172-3)*/

/* Q31 */
static int aa_cs[8] = {
    1841452032,
    1893526528,
    2039312000,
    2111651968,
    2137858176,
    2145681024,
    2147267200,
    2147468928,
};

/* Q31 */
static int aa_ca[8] = {
    -1104871168,
    -1013036672,
    -672972928,
    -390655616,
    -203096528,
    -87972920,
    -30491194,
    -7945636,
};

#define _IMDCT32B_9P    2
#define _IMDCT32B_CONST 2
#define _IMDCT32B_WIN89 2

static const Ipp32s _pIMDCT36CoeffStage3[8] =
{
   538921664,  /* Q30, max 1.9  */
  1539975680,  /* Q28, max 5.73 */
   555809664,  /* Q30, max 1.93 */
  2074309888,
   592371520,
  1270344832,
   655398336,
   936005888
};

static const Ipp32s _pIMDCT12x3Coeff[36]=
{
  -280302863,   821806413, -1307305214,  1703713325,
 -1984016188,  2129111627,  -821806413,  1984016188,
 -1984016188,   821806413,   821806413, -1984016188,
 -1307305214,  1984016188,   280302863, -2129111627,
   821806413,  1703713325, -1703713325,   821806413,
  2129111627,   280302863, -1984016188, -1307305214,
 -1984016188,  -821806413,   821806413,  1984016188,
  1984016188,   821806413, -2129111627, -1984016188,
 -1703713325, -1307305214,  -821806413,  -280302863
};

static const Ipp32s _pIMDCTWin[3][36]=
{
  {
    17331497,    57555973,   108133460,   174813955,
   536870935,   412195909,   666376477,  1251956820,
  1039402258, -1134308520, -1631581894, -1046001545,
  -791820975, -1296121091,  -554439031,  -487758516,
  -437181022,  -396956545,  -363743675,  -335460810,
  -310736462,  -288622674,  -536870920,  -249660198,
  -231892947,  -214801826,  -198099932,  -181525144,
  -164823238,  -147732101,  -129964873,  -222379216,
   -91002380,   -68888615,   -44164253,   -15881392
  },