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ISource.cpp
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ISource.cpp
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#include <cstdio>
#include <algorithm>
#define WIN32_LEAN_AND_MEAN
#define NOMINMAX
#include <windows.h>
#include "ISource.h"
namespace {
static union uif_t {
uint32_t i;
float f;
} *h2s_table;
inline float quantize(double v)
{
const float anti_denormal = 1.0e-30f;
float x = static_cast<float>(v);
x += anti_denormal;
x -= anti_denormal;
return x;
}
uint32_t half2single_(uint16_t n)
{
unsigned sign = n >> 15;
unsigned exp = (n >> 10) & 0x1F;
unsigned mantissa = n & 0x3FF;
if (exp == 0 && mantissa == 0)
return sign << 31;
if (exp == 0x1F)
exp = 0x8F;
else if (exp == 0) {
for (; !(mantissa & 0x400); mantissa <<= 1, --exp)
;
++exp;
mantissa &= ~0x400;
}
return (sign << 31) | ((exp + 0x70) << 23) | (mantissa << 13);
}
void init_h2s_table()
{
if (!h2s_table) {
uif_t *p = new uif_t[1<<16];
for (unsigned n = 0; n < (1<<16); ++n)
p[n].i = half2single_(n);
InterlockedCompareExchangePointerRelease((void**)&h2s_table, p, 0);
}
}
}
size_t readSamplesFull(ISource *src, void *buffer, size_t nsamples)
{
uint8_t *bp = static_cast<uint8_t*>(buffer);
size_t n, rest = nsamples;
unsigned bpf = src->getSampleFormat().mBytesPerFrame;
while (rest > 0 && (n = src->readSamples(bp, rest)) > 0) {
rest -= n;
bp += n * bpf;
}
return nsamples - rest;
}
size_t readSamplesAsFloat(ISource *src, std::vector<uint8_t> *pivot,
std::vector<float> *floatBuffer, size_t nsamples)
{
const AudioStreamBasicDescription &sf = src->getSampleFormat();
if (floatBuffer->size() < nsamples * sf.mChannelsPerFrame)
floatBuffer->resize(nsamples * sf.mChannelsPerFrame);
return readSamplesAsFloat(src, pivot, &(*floatBuffer)[0], nsamples);
}
size_t readSamplesAsFloat(ISource *src, std::vector<uint8_t> *pivot,
float *floatBuffer, size_t nsamples)
{
const AudioStreamBasicDescription &sf = src->getSampleFormat();
uint32_t bpc = sf.mBytesPerFrame / sf.mChannelsPerFrame;
if ((sf.mFormatFlags & kAudioFormatFlagIsFloat) && bpc == 4)
return src->readSamples(floatBuffer, nsamples);
if (pivot->size() < nsamples * sf.mBytesPerFrame)
pivot->resize(nsamples * sf.mBytesPerFrame);
void *bp = &(*pivot)[0];
float *fp = floatBuffer;
nsamples = src->readSamples(bp, nsamples);
size_t blen = nsamples * sf.mBytesPerFrame;
if (sf.mFormatFlags & kAudioFormatFlagIsFloat) {
if (bpc == 8) {
double *src = static_cast<double *>(bp);
std::transform(src, src + (blen / 8), fp, quantize);
} else if (bpc == 2) {
uint16_t *src = static_cast<uint16_t *>(bp);
init_h2s_table();
for (size_t i = 0; i < blen / 2; ++i)
*fp++ = h2s_table[src[i]].f / 65536.0;
} else {
throw std::runtime_error("readSamplesAsFloat(): BUG");
}
} else {
int *src = static_cast<int *>(bp);
for (size_t i = 0; i < blen / 4; ++i)
*fp++ = src[i] / 2147483648.0f;
}
return nsamples;
}
size_t readSamplesAsFloat(ISource *src, std::vector<uint8_t> *pivot,
std::vector<double> *doubleBuffer, size_t nsamples)
{
const AudioStreamBasicDescription &sf = src->getSampleFormat();
if (doubleBuffer->size() < nsamples * sf.mChannelsPerFrame)
doubleBuffer->resize(nsamples * sf.mChannelsPerFrame);
return readSamplesAsFloat(src, pivot, &(*doubleBuffer)[0], nsamples);
}
size_t readSamplesAsFloat(ISource *src, std::vector<uint8_t> *pivot,
double *doubleBuffer, size_t nsamples)
{
const AudioStreamBasicDescription &sf = src->getSampleFormat();
uint32_t bpc = sf.mBytesPerFrame / sf.mChannelsPerFrame;
if ((sf.mFormatFlags & kAudioFormatFlagIsFloat) && bpc == 8)
return src->readSamples(doubleBuffer, nsamples);
if (pivot->size() < nsamples * sf.mBytesPerFrame)
pivot->resize(nsamples * sf.mBytesPerFrame);
void *bp = &(*pivot)[0];
double *fp = doubleBuffer;
nsamples = src->readSamples(bp, nsamples);
size_t blen = nsamples * sf.mBytesPerFrame;
if (sf.mFormatFlags & kAudioFormatFlagIsFloat) {
if (bpc == 4) {
float *src = static_cast<float*>(bp);
std::copy(src, src + (blen / 4), fp);
} else if (bpc == 2) {
uint16_t *src = static_cast<uint16_t *>(bp);
init_h2s_table();
for (size_t i = 0; i < blen / 2; ++i) {
*fp++ = h2s_table[src[i]].f / 65536.0;
}
} else {
throw std::runtime_error("readSamplesAsFloat(): BUG");
}
} else {
int *src = static_cast<int *>(bp);
for (size_t i = 0; i < blen / 4; ++i)
*fp++ = src[i] / 2147483648.0;
}
return nsamples;
}