sublay2.cpp

一个自己编制的基于pocketPC的mp3播放器

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	4.0f/9.0f,  2.0f/9.0f,  6.0f/9.0f,    6.0f/9.0f,  2.0f/9.0f,  6.0f/9.0f,    8.0f/9.0f,  2.0f/9.0f,  6.0f/9.0f,
  -8.0f/9.0f,  4.0f/9.0f,  6.0f/9.0f,   -6.0f/9.0f,  4.0f/9.0f,  6.0f/9.0f,   -4.0f/9.0f,  4.0f/9.0f,  6.0f/9.0f,
  -2.0f/9.0f,  4.0f/9.0f,  6.0f/9.0f,        0.0f,  4.0f/9.0f,  6.0f/9.0f,    2.0f/9.0f,  4.0f/9.0f,  6.0f/9.0f,
	4.0f/9.0f,  4.0f/9.0f,  6.0f/9.0f,    6.0f/9.0f,  4.0f/9.0f,  6.0f/9.0f,    8.0f/9.0f,  4.0f/9.0f,  6.0f/9.0f,
  -8.0f/9.0f,  6.0f/9.0f,  6.0f/9.0f,   -6.0f/9.0f,  6.0f/9.0f,  6.0f/9.0f,   -4.0f/9.0f,  6.0f/9.0f,  6.0f/9.0f,
  -2.0f/9.0f,  6.0f/9.0f,  6.0f/9.0f,        0.0f,  6.0f/9.0f,  6.0f/9.0f,    2.0f/9.0f,  6.0f/9.0f,  6.0f/9.0f,
	4.0f/9.0f,  6.0f/9.0f,  6.0f/9.0f,    6.0f/9.0f,  6.0f/9.0f,  6.0f/9.0f,    8.0f/9.0f,  6.0f/9.0f,  6.0f/9.0f,
  -8.0f/9.0f,  8.0f/9.0f,  6.0f/9.0f,   -6.0f/9.0f,  8.0f/9.0f,  6.0f/9.0f,   -4.0f/9.0f,  8.0f/9.0f,  6.0f/9.0f,
  -2.0f/9.0f,  8.0f/9.0f,  6.0f/9.0f,        0.0f,  8.0f/9.0f,  6.0f/9.0f,    2.0f/9.0f,  8.0f/9.0f,  6.0f/9.0f,
	4.0f/9.0f,  8.0f/9.0f,  6.0f/9.0f,    6.0f/9.0f,  8.0f/9.0f,  6.0f/9.0f,    8.0f/9.0f,  8.0f/9.0f,  6.0f/9.0f,
  -8.0f/9.0f, -8.0f/9.0f,  8.0f/9.0f,   -6.0f/9.0f, -8.0f/9.0f,  8.0f/9.0f,   -4.0f/9.0f, -8.0f/9.0f,  8.0f/9.0f,
  -2.0f/9.0f, -8.0f/9.0f,  8.0f/9.0f,        0.0f, -8.0f/9.0f,  8.0f/9.0f,    2.0f/9.0f, -8.0f/9.0f,  8.0f/9.0f,
   4.0f/9.0f, -8.0f/9.0f,  8.0f/9.0f,    6.0f/9.0f, -8.0f/9.0f,  8.0f/9.0f,    8.0f/9.0f, -8.0f/9.0f,  8.0f/9.0f,
  -8.0f/9.0f, -6.0f/9.0f,  8.0f/9.0f,   -6.0f/9.0f, -6.0f/9.0f,  8.0f/9.0f,   -4.0f/9.0f, -6.0f/9.0f,  8.0f/9.0f,
  -2.0f/9.0f, -6.0f/9.0f,  8.0f/9.0f,        0.0f, -6.0f/9.0f,  8.0f/9.0f,    2.0f/9.0f, -6.0f/9.0f,  8.0f/9.0f,
	4.0f/9.0f, -6.0f/9.0f,  8.0f/9.0f,    6.0f/9.0f, -6.0f/9.0f,  8.0f/9.0f,    8.0f/9.0f, -6.0f/9.0f,  8.0f/9.0f,
  -8.0f/9.0f, -4.0f/9.0f,  8.0f/9.0f,   -6.0f/9.0f, -4.0f/9.0f,  8.0f/9.0f,   -4.0f/9.0f, -4.0f/9.0f,  8.0f/9.0f,
  -2.0f/9.0f, -4.0f/9.0f,  8.0f/9.0f,        0.0f, -4.0f/9.0f,  8.0f/9.0f,    2.0f/9.0f, -4.0f/9.0f,  8.0f/9.0f,
   4.0f/9.0f, -4.0f/9.0f,  8.0f/9.0f,    6.0f/9.0f, -4.0f/9.0f,  8.0f/9.0f,    8.0f/9.0f, -4.0f/9.0f,  8.0f/9.0f,
  -8.0f/9.0f, -2.0f/9.0f,  8.0f/9.0f,   -6.0f/9.0f, -2.0f/9.0f,  8.0f/9.0f,   -4.0f/9.0f, -2.0f/9.0f,  8.0f/9.0f,
  -2.0f/9.0f, -2.0f/9.0f,  8.0f/9.0f,        0.0f, -2.0f/9.0f,  8.0f/9.0f,    2.0f/9.0f, -2.0f/9.0f,  8.0f/9.0f,
   4.0f/9.0f, -2.0f/9.0f,  8.0f/9.0f,    6.0f/9.0f, -2.0f/9.0f,  8.0f/9.0f,    8.0f/9.0f, -2.0f/9.0f,  8.0f/9.0f,
  -8.0f/9.0f,      0.0f,  8.0f/9.0f,   -6.0f/9.0f,      0.0f,  8.0f/9.0f,   -4.0f/9.0f,      0.0f,  8.0f/9.0f,
  -2.0f/9.0f,      0.0f,  8.0f/9.0f,        0.0f,      0.0f,  8.0f/9.0f,    2.0f/9.0f,      0.0f,  8.0f/9.0f,
   4.0f/9.0f,      0.0f,  8.0f/9.0f,    6.0f/9.0f,      0.0f,  8.0f/9.0f,    8.0f/9.0f,      0.0f,  8.0f/9.0f,
  -8.0f/9.0f,  2.0f/9.0f,  8.0f/9.0f,   -6.0f/9.0f,  2.0f/9.0f,  8.0f/9.0f,   -4.0f/9.0f,  2.0f/9.0f,  8.0f/9.0f,
  -2.0f/9.0f,  2.0f/9.0f,  8.0f/9.0f,        0.0f,  2.0f/9.0f,  8.0f/9.0f,    2.0f/9.0f,  2.0f/9.0f,  8.0f/9.0f,
	4.0f/9.0f,  2.0f/9.0f,  8.0f/9.0f,    6.0f/9.0f,  2.0f/9.0f,  8.0f/9.0f,    8.0f/9.0f,  2.0f/9.0f,  8.0f/9.0f,
  -8.0f/9.0f,  4.0f/9.0f,  8.0f/9.0f,   -6.0f/9.0f,  4.0f/9.0f,  8.0f/9.0f,   -4.0f/9.0f,  4.0f/9.0f,  8.0f/9.0f,
  -2.0f/9.0f,  4.0f/9.0f,  8.0f/9.0f,        0.0f,  4.0f/9.0f,  8.0f/9.0f,    2.0f/9.0f,  4.0f/9.0f,  8.0f/9.0f,
	4.0f/9.0f,  4.0f/9.0f,  8.0f/9.0f,    6.0f/9.0f,  4.0f/9.0f,  8.0f/9.0f,    8.0f/9.0f,  4.0f/9.0f,  8.0f/9.0f,
  -8.0f/9.0f,  6.0f/9.0f,  8.0f/9.0f,   -6.0f/9.0f,  6.0f/9.0f,  8.0f/9.0f,   -4.0f/9.0f,  6.0f/9.0f,  8.0f/9.0f,
  -2.0f/9.0f,  6.0f/9.0f,  8.0f/9.0f,        0.0f,  6.0f/9.0f,  8.0f/9.0f,    2.0f/9.0f,  6.0f/9.0f,  8.0f/9.0f,
   4.0f/9.0f,  6.0f/9.0f,  8.0f/9.0f,    6.0f/9.0f,  6.0f/9.0f,  8.0f/9.0f,    8.0f/9.0f,  6.0f/9.0f,  8.0f/9.0f,
  -8.0f/9.0f,  8.0f/9.0f,  8.0f/9.0f,   -6.0f/9.0f,  8.0f/9.0f,  8.0f/9.0f,   -4.0f/9.0f,  8.0f/9.0f,  8.0f/9.0f,
  -2.0f/9.0f,  8.0f/9.0f,  8.0f/9.0f,        0.0f,  8.0f/9.0f,  8.0f/9.0f,    2.0f/9.0f,  8.0f/9.0f,  8.0f/9.0f,
   4.0f/9.0f,  8.0f/9.0f,  8.0f/9.0f,    6.0f/9.0f,  8.0f/9.0f,  8.0f/9.0f,    8.0f/9.0f,  8.0f/9.0f,  8.0f/9.0f
};


// data taken from ISO/IEC DIS 11172, Annexes 3-B.2[abcd] and 3-B.4:

// subbands 0-2 in tables 3-B.2a and 2b: (index is allocation)
static const uint32 table_ab1_codelength[16] =
  // bits per codeword
{ 0, 5, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };

static const real *table_ab1_groupingtables[16] =
  // pointer to sample grouping table, or NULL-pointer if ungrouped
{ 0, grouping_5bits, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

static const real table_ab1_factor[16] =
  // factor for requantization: (real)sample * factor - 1.0 gives requantized sample
{ 0.0f, 1.0f/2.0f, 1.0f/4.0f, 1.0f/8.0f, 1.0f/16.0f, 1.0f/32.0f, 1.0f/64.0f,
  1.0f/128.0f, 1.0f/256.0f, 1.0f/512.0f, 1.0f/1024.0f, 1.0f/2048.0f,
  1.0f/4096.0f, 1.0f/8192.0f, 1.0f/16384.0f, 1.0f/32768.0f };

static const real table_ab1_c[16] =
  // factor c for requantization from table 3-B.4
{ 0.0f,           1.33333333333f, 1.14285714286f, 1.06666666666f, 1.03225806452f,
  1.01587301587f, 1.00787401575f, 1.00392156863f, 1.00195694716f, 1.00097751711f,
  1.00048851979f, 1.00024420024f, 1.00012208522f, 1.00006103888f, 1.00003051851f,
  1.00001525902f };
static const real table_ab1_d[16] =
  // addend d for requantization from table 3-B.4
{ 0.0f,           0.50000000000f, 0.25000000000f, 0.12500000000f, 0.06250000000f,
  0.03125000000f, 0.01562500000f, 0.00781250000f, 0.00390625000f, 0.00195312500f,
  0.00097656250f, 0.00048828125f, 0.00024414063f, 0.00012207031f, 0.00006103516f,
  0.00003051758f };

// subbands 3-... tables 3-B.2a and 2b:
static const real *table_ab234_groupingtables[16] =
{ 0, grouping_5bits, grouping_7bits, 0, grouping_10bits, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

// subbands 3-10 in tables 3-B.2a and 2b:
static const uint32 table_ab2_codelength[16] =
{ 0, 5, 7, 3, 10, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16 };
static const real table_ab2_factor[16] =
{ 0.0f, 1.0f/2.0f, 1.0f/4.0f, 1.0f/4.0f, 1.0f/8.0f, 1.0f/8.0f, 1.0f/16.0f,
  1.0f/32.0f, 1.0f/64.0f, 1.0f/128.0f, 1.0f/256.0f, 1.0f/512.0f,
  1.0f/1024.0f, 1.0f/2048.0f, 1.0f/4096.0f, 1.0f/32768.0f };
static const real table_ab2_c[16] =
{ 0.0f,           1.33333333333f, 1.60000000000f, 1.14285714286f, 1.77777777777f,
  1.06666666666f, 1.03225806452f, 1.01587301587f, 1.00787401575f, 1.00392156863f,
  1.00195694716f, 1.00097751711f, 1.00048851979f, 1.00024420024f, 1.00012208522f,
  1.00001525902f };
static const real table_ab2_d[16] =
{ 0.0f,           0.50000000000f, 0.50000000000f, 0.25000000000f, 0.50000000000f,
  0.12500000000f, 0.06250000000f, 0.03125000000f, 0.01562500000f, 0.00781250000f,
  0.00390625000f, 0.00195312500f, 0.00097656250f, 0.00048828125f, 0.00024414063f,
  0.00003051758f };

// subbands 11-22 in tables 3-B.2a and 2b:
static const uint32 table_ab3_codelength[8] = { 0, 5, 7, 3, 10, 4, 5, 16 };
static const real table_ab3_factor[8] =
{ 0.0f, 1.0f/2.0f, 1.0f/4.0f, 1.0f/4.0f, 1.0f/8.0f, 1.0f/8.0f, 1.0f/16.0f, 1.0f/32768.0f };
static const real table_ab3_c[8] =
{ 0.0f,           1.33333333333f, 1.60000000000f, 1.14285714286f, 1.77777777777f,
  1.06666666666f, 1.03225806452f, 1.00001525902f };
static const real table_ab3_d[8] =
{ 0.0f,           0.50000000000f, 0.50000000000f, 0.25000000000f, 0.50000000000f,
  0.12500000000f, 0.06250000000f, 0.00003051758f };

// subbands 23-... in tables 3-B.2a and 2b:
static const uint32 table_ab4_codelength[4] = { 0, 5, 7, 16 };
static const real table_ab4_factor[8] = { 0.0f, 1.0f/2.0f, 1.0f/4.0f, 1.0f/32768.0f };
static const real table_ab4_c[4] = { 0.0f, 1.33333333333f, 1.60000000000f, 1.00001525902f };
static const real table_ab4_d[4] = { 0.0f, 0.50000000000f, 0.50000000000f, 0.00003051758f };

// subbands in tables 3-B.2c and 2d:
static const uint32 table_cd_codelength[16] =
{ 0, 5, 7, 10, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
static const real *table_cd_groupingtables[16] =
{ 0, grouping_5bits, grouping_7bits, grouping_10bits, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
static const real table_cd_factor[16] =
{ 0.0f, 1.0f/2.0f, 1.0f/4.0f, 1.0f/8.0f, 1.0f/8.0f, 1.0f/16.0f, 1.0f/32.0f, 1.0f/64.0f,
  1.0f/128.0f, 1.0f/256.0f, 1.0f/512.0f, 1.0f/1024.0f, 1.0f/2048.0f, 1.0f/4096.0f,
  1.0f/8192.0f, 1.0f/16384.0f };
static const real table_cd_c[16] =
{ 0.0f,           1.33333333333f, 1.60000000000f, 1.77777777777f, 1.06666666666f,
  1.03225806452f, 1.01587301587f, 1.00787401575f, 1.00392156863f, 1.00195694716f,
  1.00097751711f, 1.00048851979f, 1.00024420024f, 1.00012208522f, 1.00006103888f,
  1.00003051851f };
static const real table_cd_d[16] =
{ 0.0f,           0.50000000000f, 0.50000000000f, 0.50000000000f, 0.12500000000f,
  0.06250000000f, 0.03125000000f, 0.01562500000f, 0.00781250000f, 0.00390625000f,
  0.00195312500f, 0.00097656250f, 0.00048828125f, 0.00024414063f, 0.00012207031f,
  0.00006103516f };



/**********************/	// used for single channel mode
/*** Standard Class ***/	// and in derived class for intensity
/**********************/	// stereo mode

SubbandLayer2::SubbandLayer2(uint32 subbandnumber)
{
  this->subbandnumber = subbandnumber;
  groupnumber = samplenumber = 0;
}


uint32 SubbandLayer2::get_allocationlength(Header *header)
{

  if (header->version() == MPEG1) {

	  uint32 channel_bitrate = header->bitrate_index();