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split simple sound utils

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This commit is contained in:
Glenn Maynard
2004-10-25 01:53:19 +00:00
parent a318050891
commit 36f788dcc7
4 changed files with 147 additions and 78 deletions
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stepmania/src/RageSound.cpp
+4 -72
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@@ -28,6 +28,7 @@
#include "RageException.h"
#include "PrefsManager.h"
#include "arch/ArchHooks/ArchHooks.h"
#include "RageSoundUtil.h"
#include "RageSoundReader_Preload.h"
#include "RageSoundReader_Resample.h"
@@ -280,22 +281,6 @@ void RageSound::RateChange(char *buf, int &cnt,
cnt = (cnt * speed_output_samples) / speed_input_samples;
}
/* Dupe mono to stereo in-place; do it in reverse, to handle overlap. */
void ConvertMonoToStereoInPlace( int16_t *data, int iFrames )
{
int16_t *input = data;
int16_t *output = input;
input += iFrames;
output += iFrames * 2;
while( iFrames-- )
{
input -= 1;
output -= 2;
output[0] = input[0];
output[1] = input[0];
}
}
/* Fill the buffer by about "bytes" worth of data. (We might go a little
* over, and we won't overflow our buffer.) Return the number of bytes
* actually read; 0 = EOF. Convert mono input to stereo. */
@@ -338,7 +323,7 @@ int RageSound::FillBuf( int frames )
if( Sample->GetNumChannels() == 1 )
{
ConvertMonoToStereoInPlace( (int16_t *) inbuf, cnt / sizeof(int16_t) );
RageSoundUtil::ConvertMonoToStereoInPlace( (int16_t *) inbuf, cnt / sizeof(int16_t) );
cnt *= 2;
}
@@ -396,59 +381,6 @@ int RageSound::GetData( char *buffer, int frames )
return got;
}
/* Pan buffer left or right; fPos is -1...+1. */
void PanSound( int16_t *buffer, int frames, float fPos )
{
if( fPos == 0 )
return; /* no change */
bool bSwap = fPos < 0;
if( bSwap )
fPos = -fPos;
float fLeftFactors[2] ={ 1-fPos, 0 };
float fRightFactors[2] =
{
SCALE( fPos, 0, 1, 0.5f, 0 ),
SCALE( fPos, 0, 1, 0.5f, 1 )
};
if( bSwap )
{
swap( fLeftFactors[0], fRightFactors[0] );
swap( fLeftFactors[1], fRightFactors[1] );
}
ASSERT_M( channels == 2, ssprintf("%i", channels) );
for( int samp = 0; samp < frames; ++samp )
{
int16_t l = int16_t(buffer[0]*fLeftFactors[0] + buffer[1]*fLeftFactors[1]);
int16_t r = int16_t(buffer[0]*fRightFactors[0] + buffer[1]*fRightFactors[1]);
buffer[0] = l;
buffer[1] = r;
buffer += 2;
}
}
void FadeSound( int16_t *buffer, int frames, float fStartVolume, float fEndVolume )
{
/* If the whole buffer is full volume, skip. */
if( fStartVolume > .9999f && fEndVolume > .9999f )
return;
for( int samp = 0; samp < frames; ++samp )
{
float fVolPercent = SCALE( samp, 0, frames, fStartVolume, fEndVolume );
fVolPercent = clamp( fVolPercent, 0.f, 1.f );
for(int i = 0; i < channels; ++i)
{
*buffer = short(*buffer * fVolPercent);
buffer++;
}
}
}
/* RageSound::GetDataToPlay and RageSound::FillBuf are the main threaded API. These
* need to execute without blocking other threads from calling eg. GetPositionSeconds,
* since they may take some time to run.
@@ -569,10 +501,10 @@ bool RageSound::GetDataToPlay( int16_t *buffer, int size, int &sound_frame, int
const float fEndSecond = float(decode_position+got_frames) / samplerate();
const float fStartVolume = SCALE( fStartSecond, fStartFadingOutAt, fFinishFadingOutAt, 1.0f, 0.0f );
const float fEndVolume = SCALE( fEndSecond, fStartFadingOutAt, fFinishFadingOutAt, 1.0f, 0.0f );
FadeSound( buffer, got_frames, fStartVolume, fEndVolume );
RageSoundUtil::Fade( buffer, got_frames, fStartVolume, fEndVolume );
}
PanSound( buffer, got_frames, m_Param.m_Balance );
RageSoundUtil::Pan( buffer, got_frames, m_Param.m_Balance );
sound_frame = decode_position;