diff options
| author | Chris Robinson <[email protected]> | 2017-03-31 06:54:46 -0700 |
|---|---|---|
| committer | Chris Robinson <[email protected]> | 2017-03-31 06:54:46 -0700 |
| commit | ac8b4aa5f66db68609459a9444c2a7083b2e8f28 (patch) | |
| tree | d4f05d86836bcfba85fdb8accee4a95034fbad2d /OpenAL32 | |
| parent | 9fb07101dc0ab5b7f2785584b4c29e18232ba99c (diff) | |
Convert integer samples to float using a power-of-2 divisor
This should cut down on unnecessary quantization noise (however minor) for 8-
and 16-bit samples. Unfortunately a power-of-2 multiple can't be used as easily
for converting float samples to integer, due to integer types having a non-
power-of-2 maximum amplitude (it'd require more per-sample clamping).
Diffstat (limited to 'OpenAL32')
| -rw-r--r-- | OpenAL32/sample_cvt.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/OpenAL32/sample_cvt.c b/OpenAL32/sample_cvt.c index aff3de83..daea548a 100644 --- a/OpenAL32/sample_cvt.c +++ b/OpenAL32/sample_cvt.c @@ -608,17 +608,17 @@ static inline T Conv_##T##_##UT(UT val) { return (T)Conv_##ST##_##UT(val) * OP; #define DECL_TEMPLATE2(T1, T2, OP) \ DECL_TEMPLATE(T1, AL##T2, ALu##T2, OP) -DECL_TEMPLATE2(ALfloat, byte, (1.0f/127.0f)) -DECL_TEMPLATE2(ALdouble, byte, (1.0/127.0)) -DECL_TEMPLATE2(ALfloat, short, (1.0f/32767.0f)) -DECL_TEMPLATE2(ALdouble, short, (1.0/32767.0)) -DECL_TEMPLATE2(ALdouble, int, (1.0/2147483647.0)) +DECL_TEMPLATE2(ALfloat, byte, (1.0f/128.0f)) +DECL_TEMPLATE2(ALdouble, byte, (1.0/128.0)) +DECL_TEMPLATE2(ALfloat, short, (1.0f/32768.0f)) +DECL_TEMPLATE2(ALdouble, short, (1.0/32768.0)) +DECL_TEMPLATE2(ALdouble, int, (1.0/2147483648.0)) /* Special handling for int32 to float32, since it would overflow. */ static inline ALfloat Conv_ALfloat_ALint(ALint val) -{ return (ALfloat)(val>>7) * (1.0f/16777215.0f); } +{ return (ALfloat)(val>>7) * (1.0f/16777216.0f); } static inline ALfloat Conv_ALfloat_ALuint(ALuint val) -{ return (ALfloat)(Conv_ALint_ALuint(val)>>7) * (1.0f/16777215.0f); } +{ return (ALfloat)(Conv_ALint_ALuint(val)>>7) * (1.0f/16777216.0f); } #undef DECL_TEMPLATE2 #undef DECL_TEMPLATE |