protected override void CalculateHistoryAdpcm4(int sample, out int last, out int penult)
{
last = 0;
penult = 0;
var frame = (sample / 16);
if (frame == 0)
{
return;
}
var adpcm4 = new byte[9];
var pcm16 = new short[16];
int _last = 0, _penult = 0;
for (var i = 0; i < frame; ++i)
{
for (var j = 0; j < 16; ++j)
{
pcm16[j] = 0;
if ((i * 16 + j) < mSampleCount)
{
ReadPcm16((i * 16 + j), out pcm16[j]);
}
}
Waveform.Pcm16toAdpcm4(pcm16, adpcm4, ref _last, ref _penult);
Waveform.Adpcm4toPcm16(adpcm4, pcm16, ref last, ref penult);
}
}
protected override void WriteAdpcm4(aBinaryWriter writer)
{
var adpcm4 = new byte[9];
var pcm16 = new short[16];
int last = 0, penult = 0;
for (var i = 0; i < mSampleCount; i += 16)
{
for (var j = 0; j < 16; ++j)
{
pcm16[j] = 0;
if (i + j < mSampleCount)
{
ReadPcm16((i + j), out pcm16[j]);
}
}
Waveform.Pcm16toAdpcm4(pcm16, adpcm4, ref last, ref penult);
writer.Write8s(adpcm4);
}
}
protected override void WriteAdpcm4(aBinaryWriter writer)
{
mReader.Goto(0);
switch (mFormat)
{
case WaveFormat.Pcm8: {
var pcm16 = new short[16];
var adpcm4 = new byte[9];
int last = 0, penult = 0;
for (var i = 0; i < mSampleCount; i += 16)
{
for (var j = 0; j < 16; ++j)
{
pcm16[j] = 0;
if (i + j < mSampleCount)
{
Waveform.Pcm8toPcm16(mReader.ReadS8(), out pcm16[j]);
}
}
Waveform.Pcm16toAdpcm4(pcm16, adpcm4, ref last, ref penult);
writer.Write8s(adpcm4);
}
break;
}
case WaveFormat.Pcm16: {
var pcm16 = new short[16];
var adpcm4 = new byte[9];
int _last = 0, _penult = 0;
for (var i = 0; i < mSampleCount; i += 16)
{
for (var j = 0; j < 16; ++j)
{
pcm16[j] = (short)(i + j < mSampleCount ? mReader.ReadS16() : 0);
}
Waveform.Pcm16toAdpcm4(pcm16, adpcm4, ref _last, ref _penult);
writer.Write8s(adpcm4);
}
break;
}
case WaveFormat.Adpcm2: {
var pcm16 = new short[16];
var adpcm4 = new byte[9];
int last1 = 0, penult1 = 0;
int last2 = 0, penult2 = 0;
for (var i = 0; i < mSampleCount; i += 16)
{
Waveform.Adpcm2toPcm16(mReader.Read8s(5), pcm16, ref last1, ref penult1);
Waveform.Pcm16toAdpcm4(pcm16, adpcm4, ref last2, ref penult2);
writer.Write8s(adpcm4);
}
break;
}
case WaveFormat.Adpcm4: {
for (var i = 0; i < mSampleCount; i += 16)
{
writer.Write8s(mReader.Read8s(9));
}
break;
}
}
}
protected override void CalculateHistoryAdpcm4(int sample, out int last, out int penult)
{
last = 0;
penult = 0;
var frame = (sample / 16);
if (frame == 0)
{
return;
}
switch (mFormat)
{
case WaveFormat.Pcm8: {
var adpcm4 = new byte[9];
var pcm16 = new short[16];
int _last = 0, _penult = 0;
mReader.Goto(0);
for (var i = 0; i < frame; ++i)
{
for (var j = 0; j < 16; ++j)
{
pcm16[j] = 0;
if ((i * 16 + j) < mSampleCount)
{
Waveform.Pcm8toPcm16(mReader.ReadS8(), out pcm16[j]);
}
}
Waveform.Pcm16toAdpcm4(pcm16, adpcm4, ref _last, ref _penult);
Waveform.Adpcm4toPcm16(adpcm4, pcm16, ref last, ref penult);
}
break;
}
case WaveFormat.Pcm16: {
var adpcm4 = new byte[9];
var pcm16 = new short[16];
int _last = 0, _penult = 0;
mReader.Goto(0);
for (var i = 0; i < frame; ++i)
{
for (var j = 0; j < 16; ++j)
{
pcm16[j] = 0;
if ((i + j) < mSampleCount)
{
pcm16[j] = mReader.ReadS16();
}
}
Waveform.Pcm16toAdpcm4(pcm16, adpcm4, ref _last, ref _penult);
Waveform.Adpcm4toPcm16(adpcm4, pcm16, ref last, ref penult);
}
break;
}
case WaveFormat.Adpcm2: {
var adpcm4 = new byte[9];
var pcm16 = new short[16];
int last1 = 0, penult1 = 0;
int last2 = 0, penult2 = 0;
mReader.Goto(0);
for (var i = 0; i < frame; ++i)
{
Waveform.Adpcm2toPcm16(mReader.Read8s(5), pcm16, ref last1, ref penult1);
Waveform.Pcm16toAdpcm4(pcm16, adpcm4, ref last2, ref penult2);
Waveform.Adpcm4toPcm16(adpcm4, pcm16, ref last, ref penult);
}
break;
}
case WaveFormat.Adpcm4: {
var pcm16 = new short[16];
mReader.Goto(0);
for (var i = 0; i < frame; ++i)
{
Waveform.Adpcm4toPcm16(mReader.Read8s(9), pcm16, ref last, ref penult);
}
break;
}
}
}
