cog/Audio/Chain/HeadphoneFilter.mm

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//
// HeadphoneFilter.m
// CogAudio Framework
//
// Created by Christopher Snowhill on 1/24/22.
//
#import "HeadphoneFilter.h"
#import "AudioChunk.h"
#import "AudioDecoder.h"
#import "AudioSource.h"
#import <stdlib.h>
#import "r8bstate.h"
#import "lpc.h"
#import "util.h"
// Apparently _mm_malloc is Intel-only on newer macOS targets, so use supported posix_memalign
static void *_memalign_malloc(size_t size, size_t align) {
void *ret = NULL;
if(posix_memalign(&ret, align, size) != 0) {
return NULL;
}
return ret;
}
@implementation HeadphoneFilter
enum {
speaker_is_back_center = -1,
speaker_not_present = -2,
};
static const uint32_t max_speaker_index = 10;
static const int8_t speakers_to_hesuvi_7[11][2] = {
// front left
{ 0, 1 },
// front right
{ 1, 0 },
// front center
{ 6, 6 },
// lfe
{ 6, 6 },
// back left
{ 4, 5 },
// back right
{ 5, 4 },
// front center left
{ speaker_not_present, speaker_not_present },
// front center right
{ speaker_not_present, speaker_not_present },
// back center
{ speaker_is_back_center, speaker_is_back_center },
// side left
{ 2, 3 },
// side right
{ 3, 2 }
};
static const int8_t speakers_to_hesuvi_14[11][2] = {
// front left
{ 0, 1 },
// front right
{ 8, 7 },
// front center
{ 6, 13 },
// lfe
{ 6, 13 },
// back left
{ 4, 5 },
// back right
{ 12, 11 },
// front center left
{ speaker_not_present, speaker_not_present },
// front center right
{ speaker_not_present, speaker_not_present },
// back center
{ speaker_is_back_center, speaker_is_back_center },
// side left
{ 2, 3 },
// side right
{ 10, 9 }
};
+ (BOOL)validateImpulseFile:(NSURL *)url {
id<CogSource> source = [AudioSource audioSourceForURL:url];
if(!source)
return NO;
if(![source open:url])
return NO;
id<CogDecoder> decoder = [AudioDecoder audioDecoderForSource:source];
if(decoder == nil) {
[source close];
source = nil;
return NO;
}
if(![decoder open:source]) {
decoder = nil;
[source close];
source = nil;
return NO;
}
NSDictionary *properties = [decoder properties];
[decoder close];
decoder = nil;
[source close];
source = nil;
int impulseChannels = [[properties objectForKey:@"channels"] intValue];
if([[properties objectForKey:@"floatingPoint"] boolValue] != YES ||
[[properties objectForKey:@"bitsPerSample"] intValue] != 32 ||
!([[properties objectForKey:@"endian"] isEqualToString:@"host"] ||
[[properties objectForKey:@"endian"] isEqualToString:@"little"]) ||
(impulseChannels != 14 && impulseChannels != 7))
return NO;
return YES;
}
- (id)initWithImpulseFile:(NSURL *)url forSampleRate:(double)sampleRate withInputChannels:(size_t)channels withConfig:(uint32_t)config {
self = [super init];
if(self) {
id<CogSource> source = [AudioSource audioSourceForURL:url];
if(!source)
return nil;
if(![source open:url])
return nil;
id<CogDecoder> decoder = [AudioDecoder audioDecoderForSource:source];
if(decoder == nil) {
[source close];
source = nil;
return nil;
}
if(![decoder open:source]) {
decoder = nil;
[source close];
source = nil;
return nil;
}
NSDictionary *properties = [decoder properties];
double sampleRateOfSource = [[properties objectForKey:@"sampleRate"] floatValue];
int sampleCount = [[properties objectForKey:@"totalFrames"] intValue];
int impulseChannels = [[properties objectForKey:@"channels"] intValue];
if([[properties objectForKey:@"floatingPoint"] boolValue] != YES ||
[[properties objectForKey:@"bitsPerSample"] intValue] != 32 ||
!([[properties objectForKey:@"endian"] isEqualToString:@"host"] ||
[[properties objectForKey:@"endian"] isEqualToString:@"little"]) ||
(impulseChannels != 14 && impulseChannels != 7)) {
[decoder close];
decoder = nil;
[source close];
source = nil;
return nil;
}
float *impulseBuffer = (float *)malloc(sampleCount * sizeof(float) * impulseChannels);
if(!impulseBuffer) {
[decoder close];
decoder = nil;
[source close];
source = nil;
return nil;
}
if([decoder readAudio:impulseBuffer frames:sampleCount] != sampleCount) {
[decoder close];
decoder = nil;
[source close];
source = nil;
return nil;
}
[decoder close];
decoder = nil;
[source close];
source = nil;
if(sampleRateOfSource != sampleRate) {
double sampleRatio = sampleRate / sampleRateOfSource;
int resampledCount = (int)ceil((double)sampleCount * sampleRatio);
r8bstate *_r8bstate = new r8bstate(impulseChannels, 1024, sampleRateOfSource, sampleRate);
unsigned long PRIME_LEN_ = MAX(sampleRateOfSource / 20, 1024u);
PRIME_LEN_ = MIN(PRIME_LEN_, 16384u);
PRIME_LEN_ = MAX(PRIME_LEN_, 2 * LPC_ORDER + 1);
unsigned int N_samples_to_add_ = sampleRateOfSource;
unsigned int N_samples_to_drop_ = sampleRate;
samples_len(&N_samples_to_add_, &N_samples_to_drop_, 20, 8192u);
int resamplerLatencyIn = (int)N_samples_to_add_;
int resamplerLatencyOut = (int)N_samples_to_drop_;
float *tempImpulse = (float *)realloc(impulseBuffer, (sampleCount + resamplerLatencyIn * 2 + 1024) * sizeof(float) * impulseChannels);
if(!tempImpulse) {
free(impulseBuffer);
return nil;
}
impulseBuffer = tempImpulse;
resampledCount += resamplerLatencyOut * 2 + 1024;
float *resampledImpulse = (float *)malloc(resampledCount * sizeof(float) * impulseChannels);
if(!resampledImpulse) {
free(impulseBuffer);
return nil;
}
size_t prime = MIN(sampleCount, PRIME_LEN_);
void *extrapolate_buffer = NULL;
size_t extrapolate_buffer_size = 0;
memmove(impulseBuffer + resamplerLatencyIn * impulseChannels, impulseBuffer, sampleCount * sizeof(float) * impulseChannels);
lpc_extrapolate_bkwd(impulseBuffer + N_samples_to_add_ * impulseChannels, sampleCount, prime, impulseChannels, LPC_ORDER, N_samples_to_add_, &extrapolate_buffer, &extrapolate_buffer_size);
lpc_extrapolate_fwd(impulseBuffer + N_samples_to_add_ * impulseChannels, sampleCount, prime, impulseChannels, LPC_ORDER, N_samples_to_add_, &extrapolate_buffer, &extrapolate_buffer_size);
free(extrapolate_buffer);
size_t inputDone = 0;
size_t outputDone = 0;
outputDone = _r8bstate->resample(impulseBuffer, sampleCount + N_samples_to_add_ * 2, &inputDone, resampledImpulse, resampledCount);
if (outputDone < resampledCount) {
outputDone += _r8bstate->flush(resampledImpulse + outputDone * impulseChannels, resampledCount - outputDone);
}
delete _r8bstate;
outputDone -= N_samples_to_drop_ * 2;
memmove(resampledImpulse, resampledImpulse + N_samples_to_drop_ * impulseChannels, outputDone * sizeof(float) * impulseChannels);
free(impulseBuffer);
impulseBuffer = resampledImpulse;
sampleCount = (int)outputDone;
}
channelCount = channels;
bufferSize = 512;
fftSize = sampleCount + bufferSize;
int pow = 1;
while(fftSize > 2) {
pow++;
fftSize /= 2;
}
fftSize = 2 << pow;
float *deinterleavedImpulseBuffer = (float *)_memalign_malloc(fftSize * sizeof(float) * (impulseChannels + 1), 16);
if(!deinterleavedImpulseBuffer) {
free(impulseBuffer);
return nil;
}
for(size_t i = 0; i < impulseChannels; ++i) {
cblas_scopy(sampleCount, impulseBuffer + i, impulseChannels, deinterleavedImpulseBuffer + i * fftSize, 1);
vDSP_vclr(deinterleavedImpulseBuffer + i * fftSize + sampleCount, 1, fftSize - sampleCount);
}
free(impulseBuffer);
// Null impulse
vDSP_vclr(deinterleavedImpulseBuffer + impulseChannels * fftSize, 1, fftSize);
paddedBufferSize = fftSize;
fftSizeOver2 = (fftSize + 1) / 2;
log2n = log2f(fftSize);
log2nhalf = log2n / 2;
fftSetup = vDSP_create_fftsetup(log2n, FFT_RADIX2);
if(!fftSetup) {
free(deinterleavedImpulseBuffer);
return nil;
}
paddedSignal = (float *)_memalign_malloc(sizeof(float) * paddedBufferSize, 16);
if(!paddedSignal) {
free(deinterleavedImpulseBuffer);
return nil;
}
signal_fft.realp = (float *)_memalign_malloc(sizeof(float) * fftSizeOver2, 16);
signal_fft.imagp = (float *)_memalign_malloc(sizeof(float) * fftSizeOver2, 16);
if(!signal_fft.realp || !signal_fft.imagp) {
free(deinterleavedImpulseBuffer);
return nil;
}
input_filtered_signal_per_channel[0].realp = (float *)_memalign_malloc(sizeof(float) * fftSizeOver2, 16);
input_filtered_signal_per_channel[0].imagp = (float *)_memalign_malloc(sizeof(float) * fftSizeOver2, 16);
if(!input_filtered_signal_per_channel[0].realp ||
!input_filtered_signal_per_channel[0].imagp) {
free(deinterleavedImpulseBuffer);
return nil;
}
input_filtered_signal_per_channel[1].realp = (float *)_memalign_malloc(sizeof(float) * fftSizeOver2, 16);
input_filtered_signal_per_channel[1].imagp = (float *)_memalign_malloc(sizeof(float) * fftSizeOver2, 16);
if(!input_filtered_signal_per_channel[1].realp ||
!input_filtered_signal_per_channel[1].imagp) {
free(deinterleavedImpulseBuffer);
return nil;
}
impulse_responses = (COMPLEX_SPLIT *)calloc(sizeof(COMPLEX_SPLIT), channels * 2);
if(!impulse_responses) {
free(deinterleavedImpulseBuffer);
return nil;
}
for(size_t i = 0; i < channels; ++i) {
impulse_responses[i * 2 + 0].realp = (float *)_memalign_malloc(sizeof(float) * fftSizeOver2, 16);
impulse_responses[i * 2 + 0].imagp = (float *)_memalign_malloc(sizeof(float) * fftSizeOver2, 16);
impulse_responses[i * 2 + 1].realp = (float *)_memalign_malloc(sizeof(float) * fftSizeOver2, 16);
impulse_responses[i * 2 + 1].imagp = (float *)_memalign_malloc(sizeof(float) * fftSizeOver2, 16);
if(!impulse_responses[i * 2 + 0].realp || !impulse_responses[i * 2 + 0].imagp ||
!impulse_responses[i * 2 + 1].realp || !impulse_responses[i * 2 + 1].imagp) {
free(deinterleavedImpulseBuffer);
return nil;
}
uint32_t channelFlag = [AudioChunk extractChannelFlag:(uint32_t)i fromConfig:config];
uint32_t channelIndex = [AudioChunk findChannelIndex:channelFlag];
int leftInChannel = speaker_not_present;
int rightInChannel = speaker_not_present;
if(impulseChannels == 7) {
if(channelIndex <= max_speaker_index) {
leftInChannel = speakers_to_hesuvi_7[channelIndex][0];
rightInChannel = speakers_to_hesuvi_7[channelIndex][1];
}
} else {
if(channelIndex <= max_speaker_index) {
leftInChannel = speakers_to_hesuvi_14[channelIndex][0];
rightInChannel = speakers_to_hesuvi_14[channelIndex][1];
}
}
if(leftInChannel == speaker_is_back_center || rightInChannel == speaker_is_back_center) {
float *temp;
if(impulseChannels == 7) {
temp = (float *)malloc(sizeof(float) * fftSize);
if(!temp) {
free(deinterleavedImpulseBuffer);
return nil;
}
cblas_scopy((int)fftSize, deinterleavedImpulseBuffer + 4 * fftSize, 1, temp, 1);
vDSP_vadd(temp, 1, deinterleavedImpulseBuffer + 5 * fftSize, 1, temp, 1, fftSize);
vDSP_ctoz((DSPComplex *)temp, 2, &impulse_responses[i * 2 + 0], 1, fftSizeOver2);
vDSP_ctoz((DSPComplex *)temp, 2, &impulse_responses[i * 2 + 1], 1, fftSizeOver2);
} else {
temp = (float *)malloc(sizeof(float) * fftSize * 2);
if(!temp) {
free(deinterleavedImpulseBuffer);
return nil;
}
cblas_scopy((int)fftSize, deinterleavedImpulseBuffer + 4 * fftSize, 1, temp, 1);
vDSP_vadd(temp, 1, deinterleavedImpulseBuffer + 12 * fftSize, 1, temp, 1, fftSize);
cblas_scopy((int)fftSize, deinterleavedImpulseBuffer + 5 * fftSize, 1, temp + fftSize, 1);
vDSP_vadd(temp + fftSize, 1, deinterleavedImpulseBuffer + 11 * fftSize, 1, temp + fftSize, 1, fftSize);
vDSP_ctoz((DSPComplex *)temp, 2, &impulse_responses[i * 2 + 0], 1, fftSizeOver2);
vDSP_ctoz((DSPComplex *)(temp + fftSize), 2, &impulse_responses[i * 2 + 1], 1, fftSizeOver2);
}
free(temp);
} else if(leftInChannel == speaker_not_present || rightInChannel == speaker_not_present) {
vDSP_ctoz((DSPComplex *)(deinterleavedImpulseBuffer + impulseChannels * fftSize), 2, &impulse_responses[i * 2 + 0], 1, fftSizeOver2);
vDSP_ctoz((DSPComplex *)(deinterleavedImpulseBuffer + impulseChannels * fftSize), 2, &impulse_responses[i * 2 + 1], 1, fftSizeOver2);
} else {
vDSP_ctoz((DSPComplex *)(deinterleavedImpulseBuffer + leftInChannel * fftSize), 2, &impulse_responses[i * 2 + 0], 1, fftSizeOver2);
vDSP_ctoz((DSPComplex *)(deinterleavedImpulseBuffer + rightInChannel * fftSize), 2, &impulse_responses[i * 2 + 1], 1, fftSizeOver2);
}
vDSP_fft_zrip(fftSetup, &impulse_responses[i * 2 + 0], 1, log2n, FFT_FORWARD);
vDSP_fft_zrip(fftSetup, &impulse_responses[i * 2 + 1], 1, log2n, FFT_FORWARD);
}
free(deinterleavedImpulseBuffer);
left_result = (float *)_memalign_malloc(sizeof(float) * fftSize, 16);
right_result = (float *)_memalign_malloc(sizeof(float) * fftSize, 16);
if(!left_result || !right_result)
return nil;
prevOverlapLeft = (float *)_memalign_malloc(sizeof(float) * fftSize, 16);
prevOverlapRight = (float *)_memalign_malloc(sizeof(float) * fftSize, 16);
if(!prevOverlapLeft || !prevOverlapRight)
return nil;
left_mix_result = (float *)_memalign_malloc(sizeof(float) * fftSize, 16);
right_mix_result = (float *)_memalign_malloc(sizeof(float) * fftSize, 16);
if(!left_mix_result || !right_mix_result)
return nil;
prevOverlapLength = 0;
}
return self;
}
- (void)dealloc {
if(fftSetup) vDSP_destroy_fftsetup(fftSetup);
free(paddedSignal);
free(signal_fft.realp);
free(signal_fft.imagp);
free(input_filtered_signal_per_channel[0].realp);
free(input_filtered_signal_per_channel[0].imagp);
free(input_filtered_signal_per_channel[1].realp);
free(input_filtered_signal_per_channel[1].imagp);
if(impulse_responses) {
for(size_t i = 0; i < channelCount * 2; ++i) {
free(impulse_responses[i].realp);
free(impulse_responses[i].imagp);
}
free(impulse_responses);
}
free(left_result);
free(right_result);
free(prevOverlapLeft);
free(prevOverlapRight);
free(left_mix_result);
free(right_mix_result);
}
- (void)process:(const float *)inBuffer sampleCount:(size_t)count toBuffer:(float *)outBuffer {
const float scale = 1.0 / (4.0 * (float)fftSize);
while(count > 0) {
size_t countToDo = (count > bufferSize) ? bufferSize : count;
vDSP_vclr(left_mix_result, 1, fftSize);
vDSP_vclr(right_mix_result, 1, fftSize);
for(size_t i = 0; i < channelCount; ++i) {
cblas_scopy((int)countToDo, inBuffer + i, (int)channelCount, paddedSignal, 1);
vDSP_vclr(paddedSignal + countToDo, 1, paddedBufferSize - countToDo);
vDSP_ctoz((DSPComplex *)paddedSignal, 2, &signal_fft, 1, fftSizeOver2);
vDSP_fft_zrip(fftSetup, &signal_fft, 1, log2n, FFT_FORWARD);
// One channel forward, then multiply and back twice
float preserveIRNyq = impulse_responses[i * 2 + 0].imagp[0];
float preserveSigNyq = signal_fft.imagp[0];
impulse_responses[i * 2 + 0].imagp[0] = 0;
signal_fft.imagp[0] = 0;
vDSP_zvmul(&signal_fft, 1, &impulse_responses[i * 2 + 0], 1, &input_filtered_signal_per_channel[0], 1, fftSizeOver2, 1);
input_filtered_signal_per_channel[0].imagp[0] = preserveIRNyq * preserveSigNyq;
impulse_responses[i * 2 + 0].imagp[0] = preserveIRNyq;
preserveIRNyq = impulse_responses[i * 2 + 1].imagp[0];
impulse_responses[i * 2 + 1].imagp[0] = 0;
vDSP_zvmul(&signal_fft, 1, &impulse_responses[i * 2 + 1], 1, &input_filtered_signal_per_channel[1], 1, fftSizeOver2, 1);
input_filtered_signal_per_channel[1].imagp[0] = preserveIRNyq * preserveSigNyq;
impulse_responses[i * 2 + 1].imagp[0] = preserveIRNyq;
vDSP_fft_zrip(fftSetup, &input_filtered_signal_per_channel[0], 1, log2n, FFT_INVERSE);
vDSP_fft_zrip(fftSetup, &input_filtered_signal_per_channel[1], 1, log2n, FFT_INVERSE);
vDSP_ztoc(&input_filtered_signal_per_channel[0], 1, (DSPComplex *)left_result, 2, fftSizeOver2);
vDSP_ztoc(&input_filtered_signal_per_channel[1], 1, (DSPComplex *)right_result, 2, fftSizeOver2);
vDSP_vadd(left_mix_result, 1, left_result, 1, left_mix_result, 1, fftSize);
vDSP_vadd(right_mix_result, 1, right_result, 1, right_mix_result, 1, fftSize);
}
// Integrate previous overlap
if(prevOverlapLength) {
vDSP_vadd(prevOverlapLeft, 1, left_mix_result, 1, left_mix_result, 1, prevOverlapLength);
vDSP_vadd(prevOverlapRight, 1, right_mix_result, 1, right_mix_result, 1, prevOverlapLength);
}
prevOverlapLength = (int)(fftSize - countToDo);
cblas_scopy(prevOverlapLength, left_mix_result + countToDo, 1, prevOverlapLeft, 1);
cblas_scopy(prevOverlapLength, right_mix_result + countToDo, 1, prevOverlapRight, 1);
vDSP_vsmul(left_mix_result, 1, &scale, left_mix_result, 1, countToDo);
vDSP_vsmul(right_mix_result, 1, &scale, right_mix_result, 1, countToDo);
cblas_scopy((int)countToDo, left_mix_result, 1, outBuffer + 0, 2);
cblas_scopy((int)countToDo, right_mix_result, 1, outBuffer + 1, 2);
inBuffer += countToDo * channelCount;
outBuffer += countToDo * 2;
count -= countToDo;
}
}
- (void)reset {
prevOverlapLength = 0;
}
@end