public virtual void generateTones(ChannelUnitContext ctx, int chNum, int sb, float[] @out, int outOffset)
{
float[] wavreg1 = new float[128];
float[] wavreg2 = new float[128];
WavesData tonesNow = ctx.channels[chNum].tonesInfoPrev[sb];
WavesData tonesNext = ctx.channels[chNum].tonesInfo[sb];
// reconstruct full envelopes for both overlapping regions
// from truncated bitstream data
if (tonesNext.pendEnv.hasStartPoint && tonesNext.pendEnv.startPos < tonesNext.pendEnv.stopPos)
{
tonesNext.currEnv.hasStartPoint = true;
tonesNext.currEnv.startPos = tonesNext.pendEnv.startPos + 32;
}
else if (tonesNow.pendEnv.hasStartPoint)
{
tonesNext.currEnv.hasStartPoint = true;
tonesNext.currEnv.startPos = tonesNow.pendEnv.startPos;
}
else
{
tonesNext.currEnv.hasStartPoint = false;
tonesNext.currEnv.startPos = 0;
}
if (tonesNow.pendEnv.hasStopPoint && tonesNow.pendEnv.stopPos >= tonesNext.currEnv.startPos)
{
tonesNext.currEnv.hasStopPoint = true;
tonesNext.currEnv.stopPos = tonesNow.pendEnv.stopPos;
}
else if (tonesNext.pendEnv.hasStopPoint)
{
tonesNext.currEnv.hasStopPoint = true;
tonesNext.currEnv.stopPos = tonesNext.pendEnv.stopPos + 32;
}
else
{
tonesNext.currEnv.hasStopPoint = false;
tonesNext.currEnv.stopPos = 64;
}
// is the visible part of the envelope non-zero?
bool reg1EnvNonzero = (tonesNow.currEnv.stopPos < 32 ? false : true);
bool reg2EnvNonzero = (tonesNext.currEnv.startPos >= 32 ? false : true);
// synthesize waves for both overlapping regions
if (tonesNow.numWavs > 0 && reg1EnvNonzero)
{
wavesSynth(ctx.wavesInfoPrev, tonesNow, tonesNow.currEnv, ctx.wavesInfoPrev.phaseShift[sb] && (chNum > 0), 128, wavreg1);
}
if (tonesNext.numWavs > 0 && reg2EnvNonzero)
{
wavesSynth(ctx.wavesInfo, tonesNext, tonesNext.currEnv, ctx.wavesInfo.phaseShift[sb] && (chNum > 0), 0, wavreg2);
}
// Hann windowing for non-faded wave signals
if (tonesNow.numWavs > 0 && tonesNext.numWavs > 0 && reg1EnvNonzero && reg2EnvNonzero)
{
vectorFmul(wavreg1, 0, wavreg1, 0, hann_window, 128, 128);
vectorFmul(wavreg2, 0, wavreg2, 0, hann_window, 0, 128);
}
else
{
if (tonesNow.numWavs > 0 && !tonesNow.currEnv.hasStopPoint)
{
vectorFmul(wavreg1, 0, wavreg1, 0, hann_window, 128, 128);
}
if (tonesNext.numWavs > 0 && !tonesNext.currEnv.hasStartPoint)
{
vectorFmul(wavreg2, 0, wavreg2, 0, hann_window, 0, 128);
}
}
// Overlap and add to residual
for (int i = 0; i < 128; i++)
{
@out[outOffset + i] += wavreg1[i] + wavreg2[i];
}
}
/// <summary>
/// Synthesize sine waves according to given parameters.
///
/// @param[in] synthParam common synthesis parameters
/// @param[in] wavesInfo parameters for each sine wave
/// @param[in] envelope envelope data for all waves in a group
/// @param[in] phaseShift flag indicates 180 degrees phase shift
/// @param[in] regOffset region offset for trimming envelope data
/// @param[out] out receives synthesized data
/// </summary>
private void wavesSynth(WaveSynthParams synthParams, WavesData wavesInfo, WaveEnvelope envelope, bool phaseShift, int regOffset, float[] @out)
{
int waveParam = wavesInfo.startIndex;
for (int wn = 0; wn < wavesInfo.numWavs; wn++, waveParam++)
{
// amplitude dequantization
double amp = amp_sf_tab[synthParams.waves[waveParam].ampSf] * (synthParams.amplitudeMode == 0 ? (synthParams.waves[waveParam].ampIndex + 1) / 15.13f : 1.0f);
int inc = synthParams.waves[waveParam].freqIndex;
int pos = DEQUANT_PHASE(synthParams.waves[waveParam].phaseIndex) - (regOffset ^ 128) * inc & 2047;
// waveform generation
for (int i = 0; i < 128; i++)
{
@out[i] += (float)(sine_table[pos] * amp);
pos = (pos + inc) & 2047;
}
}
if (phaseShift)
{
// 180 degrees phase shift
for (int i = 0; i < 128; i++)
{
//JAVA TO C# CONVERTER TODO TASK: The following line could not be converted:
@out[i] = -@out[i];
}
}
// fade in with steep Hann window if requested
if (envelope.hasStartPoint)
{
int pos = (envelope.startPos << 2) - regOffset;
if (pos > 0 && pos <= 128)
{
Arrays.Fill(@out, 0, pos, 0f);
if (!envelope.hasStopPoint || envelope.startPos != envelope.stopPos)
{
@out[pos + 0] *= hann_window[0];
@out[pos + 1] *= hann_window[32];
@out[pos + 2] *= hann_window[64];
@out[pos + 3] *= hann_window[96];
}
}
}
// fade out with steep Hann window if requested
if (envelope.hasStopPoint)
{
int pos = (envelope.stopPos + 1 << 2) - regOffset;
if (pos > 0 && pos <= 128)
{
@out[pos - 4] *= hann_window[96];
@out[pos - 3] *= hann_window[64];
@out[pos - 2] *= hann_window[32];
@out[pos - 1] *= hann_window[0];
Arrays.Fill(@out, pos, 128, 0f);
}
}
}