void sbr_create_limiter_bands(Int32 limSbc[][13],
Int32 *gateMode,
Int *freqTable,
struct PATCH Patch,
const Int32 noBands)
{
Int32 i;
Int32 j;
Int32 k;
Int isPatchBorder[2];
Int32 patchBorders[MAX_NUM_PATCHES + 1];
Int32 workLimiterBandTable[32 + MAX_NUM_PATCHES + 1];
Int32 nOctaves;
const Int32 limiterBandsPerOctave[4] =
{Q_fmt(0.0F), Q_fmt(1.2F),
Q_fmt(2.0F), Q_fmt(3.0F)
};
Int32 tmp_q1;
Int32 noPatches = Patch.noOfPatches;
Int32 lowSubband = freqTable[0];
Int32 highSubband = freqTable[noBands];
for (i = 0; i < noPatches; i++)
{
patchBorders[i] = Patch.targetStartBand[i] - lowSubband;
}
patchBorders[i] = highSubband - lowSubband;
/* First band: 1 limiter band. */
limSbc[0][0] = freqTable[0] - lowSubband;
limSbc[0][1] = freqTable[noBands] - lowSubband;
gateMode[0] = 1;
/* Next three bands: 1.2, 2, 3 limiter bands/octave plus bandborders at patchborders. */
for (i = 1; i < 4; i++)
{
for (k = 0; k <= noBands; k++)
{
workLimiterBandTable[k] = freqTable[k] - lowSubband;
}
for (k = 1; k < noPatches; k++)
{
workLimiterBandTable[noBands+k] = patchBorders[k];
}
gateMode[i] = noBands + noPatches - 1;
shellsort(workLimiterBandTable, gateMode[i] + 1);
for (j = 1; j <= gateMode[i]; j++)
{
tmp_q1 = ((workLimiterBandTable[j] + lowSubband) << 20) / (workLimiterBandTable[j-1] + lowSubband);
nOctaves = pv_log2(tmp_q1);
tmp_q1 = fxp_mul32_Q20(nOctaves, limiterBandsPerOctave[i]);
if (tmp_q1 < Q_fmt(0.49))
{
if (workLimiterBandTable[j] == workLimiterBandTable[j-1])
{
workLimiterBandTable[j] = highSubband;
shellsort(workLimiterBandTable, gateMode[i] + 1);
gateMode[i]--;
j--;
continue;
}
isPatchBorder[0] = isPatchBorder[1] = 0;
for (k = 0; k <= noPatches; k++)
{
if (workLimiterBandTable[j-1] == patchBorders[k])
{
isPatchBorder[0] = 1;
break;
}
}
for (k = 0; k <= noPatches; k++)
{
if (workLimiterBandTable[j] == patchBorders[k])
{
isPatchBorder[1] = 1;
break;
}
}
if (!isPatchBorder[1])
{
workLimiterBandTable[j] = highSubband;
shellsort(workLimiterBandTable, gateMode[i] + 1);
gateMode[i]--;
j--;
}
else if (!isPatchBorder[0])
{
workLimiterBandTable[j-1] = highSubband;
shellsort(workLimiterBandTable, gateMode[i] + 1);
gateMode[i]--;
j--;
}
}
}
for (k = 0; k <= gateMode[i]; k++)
{
limSbc[i][k] = workLimiterBandTable[k];
}
}
}
#define POW_2_TABLE_LENGTH 6
#define POW_2_TABLE_LENGTH_m_2 (POW_2_TABLE_LENGTH - 2)
/*----------------------------------------------------------------------------
; LOCAL STORE/BUFFER/POINTER DEFINITIONS
; Variable declaration - defined here and used outside this module
----------------------------------------------------------------------------*/
#define R_SHIFT 29
#define Q_fmt(x) (Int32)(x*((Int32)1<<R_SHIFT) + (x>=0?0.5F:-0.5F))
#define Q27fmt(x) (Int32)(x*((Int32)1<<27) + (x>=0?0.5F:-0.5F))
const Int32 pow2_table[6] =
{
Q_fmt(0.00224510927441F), Q_fmt(0.00777943379416F),
Q_fmt(0.05737929218747F), Q_fmt(0.23918017179889F),
Q_fmt(0.69345251849351F), Q_fmt(0.99996347120248F)
};
/*----------------------------------------------------------------------------
; EXTERNAL FUNCTION REFERENCES
; Declare functions defined elsewhere and referenced in this module
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
; Declare variables used in this module but defined elsewhere
----------------------------------------------------------------------------*/
