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Small optimizations to some format conversion routines.

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This commit is contained in:
David Reid
2017-09-09 21:46:16 +10:00
parent d68ed4f887
commit 4cbeff8f48
3 changed files with 18 additions and 19 deletions
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mini_al.h
+5 -9
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@@ -2443,7 +2443,6 @@ static void mal_channel_mask_to_channel_map__win32(DWORD dwChannelMask, mal_uint
#include <audioclient.h>
#include <audiopolicy.h>
#include <mmdeviceapi.h>
//#include <functiondiscoverykeys_devpkey.h>
#if defined(_MSC_VER)
#pragma warning(pop)
#endif
@@ -8727,8 +8726,7 @@ void mal_pcm_u8_to_f32(float* pOut, const unsigned char* pIn, unsigned int count
float r;
for (unsigned int i = 0; i < count; ++i) {
int x = pIn[i];
r = x / 255.0f;
r = r * 2;
r = x * 0.00784313725490196078f;
r = r - 1;
pOut[i] = (float)r;
}
@@ -8770,9 +8768,8 @@ void mal_pcm_s16_to_f32(float* pOut, const short* pIn, unsigned int count)
float r;
for (unsigned int i = 0; i < count; ++i) {
int x = pIn[i];
r = x + 32768.0f;
r = r / 65536.0f;
r = r * 2;
r = (float)(x + 32768);
r = r * 0.00003051804379339284f;
r = r - 1;
pOut[i] = (float)r;
}
@@ -8814,9 +8811,8 @@ void mal_pcm_s24_to_f32(float* pOut, const void* pIn, unsigned int count)
float r;
for (unsigned int i = 0; i < count; ++i) {
int x = ((int)(((unsigned int)(((unsigned char*)pIn)[i*3+0]) << 8) | ((unsigned int)(((unsigned char*)pIn)[i*3+1]) << 16) | ((unsigned int)(((unsigned char*)pIn)[i*3+2])) << 24)) >> 8;
r = x + 8388608.0f;
r = r / 16777215.0f;
r = r * 2;
r = (float)(x + 8388608);
r = r * 0.00000011920929665621f;
r = r - 1;
pOut[i] = (float)r;
}