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WavPack input: Decode DSD without letting WavPack library decimate it. The supplied filter was rather noisy.

CQTexperiment
Christopher Snowhill 2022-01-14 02:02:59 -08:00
parent 903b457a28
commit ec0b343596
2 changed files with 54 additions and 9 deletions
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5
Plugins/WavPack/WavPackDecoder.h
View File

@ -32,6 +32,11 @@
WavPackReader *wv;
WavPackReader *wvc;
int32_t *inputBuffer;
size_t inputBufferSize;
BOOL isDSD;
int bitsPerSample;
int channels;

58
Plugins/WavPack/WavPackDecoder.m
View File

@ -113,6 +113,8 @@ int32_t WriteBytesProc(void *ds, void *data, int32_t bcount)
if (self)
{
wpc = NULL;
inputBuffer = NULL;
inputBufferSize = 0;
}
return self;
}
@ -153,7 +155,7 @@ int32_t WriteBytesProc(void *ds, void *data, int32_t bcount)
reader.can_seek = CanSeekProc;
reader.write_bytes = WriteBytesProc;
open_flags |= OPEN_DSD_AS_PCM | OPEN_ALT_TYPES;
open_flags |= OPEN_DSD_NATIVE | OPEN_ALT_TYPES;
if (![s seekable])
open_flags |= OPEN_STREAMING;
@ -168,8 +170,19 @@ int32_t WriteBytesProc(void *ds, void *data, int32_t bcount)
bitsPerSample = WavpackGetBitsPerSample(wpc);
frequency = WavpackGetSampleRate(wpc);
totalFrames = WavpackGetNumSamples(wpc);
isDSD = NO;
float nativeFrequency = WavpackGetNativeSampleRate(wpc);
if (nativeFrequency != frequency && bitsPerSample == 8) {
isDSD = YES;
frequency = nativeFrequency;
bitsPerSample = 1;
totalFrames *= 8;
}
bitrate = (int)(WavpackGetAverageBitrate(wpc, TRUE)/1000.0);
@ -211,13 +224,32 @@ int32_t WriteBytesProc(void *ds, void *data, int32_t bcount)
int8_t *alias8;
int16_t *alias16;
int32_t *alias32;
int32_t *inputBuffer = malloc(frames*sizeof(int32_t));
UInt32 trueFrames = frames;
if (isDSD) trueFrames = (frames / 8) & ~7;
size_t newSize = trueFrames*sizeof(int32_t)*channels;
if (!inputBuffer || newSize > inputBufferSize) {
inputBuffer = realloc(inputBuffer, inputBufferSize = newSize);
}
// Wavpack uses "complete" samples (one sample across all channels), i.e. a Core Audio frame
samplesRead = WavpackUnpackSamples(wpc, inputBuffer, frames/channels);
samplesRead = WavpackUnpackSamples(wpc, inputBuffer, trueFrames);
switch(bitsPerSample) {
case 1:
alias8 = buf;
for (sample = 0; sample < samplesRead * channels;) {
for (int channel = 0; channel < channels; channel++) {
for (int i = 0, mask = 0x80; i < 8; ++i, mask >>= 1) {
alias8[i * channels] = (inputBuffer[sample] & mask) ? 127 : -128;
}
alias8 += 1;
sample++;
}
alias8 += 7 * channels;
}
break;
case 8:
// No need for byte swapping
alias8 = buf;
@ -252,15 +284,18 @@ int32_t WriteBytesProc(void *ds, void *data, int32_t bcount)
default:
ALog(@"Unsupported sample size: %d", bitsPerSample);
}
free(inputBuffer);
if (isDSD)
samplesRead *= 8;
return samplesRead;
}
- (long)seek:(long)frame
{
WavpackSeekSample(wpc, (uint32_t) frame);
uint32_t trueFrame = (uint32_t) frame;
if (isDSD) { trueFrame /= 8; frame = trueFrame * 8; }
WavpackSeekSample(wpc, trueFrame);
return frame;
}
@ -271,6 +306,11 @@ int32_t WriteBytesProc(void *ds, void *data, int32_t bcount)
WavpackCloseFile(wpc);
wpc = NULL;
}
if (inputBuffer) {
free(inputBuffer);
inputBuffer = NULL;
inputBufferSize = 0;
}
wvc = nil;
wv = nil;
}