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add read( float * )

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optimize full volume
This commit is contained in:
Glenn Maynard
2004-01-14 22:09:55 +00:00
parent 1cac9d7b6f
commit f25f68b3f5
2 changed files with 36 additions and 6 deletions
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stepmania/src/RageSoundManager.cpp
+35 -6
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@@ -227,6 +227,10 @@ SoundMixBuffer::~SoundMixBuffer()
void SoundMixBuffer::SetVolume( float f )
{
vol = int(256*f);
/* Optimize full volume. */
if( f > 0.99f )
vol = 256;
}
void SoundMixBuffer::write(const Sint16 *buf, unsigned size)
@@ -243,21 +247,46 @@ void SoundMixBuffer::write(const Sint16 *buf, unsigned size)
used = size;
}
for(unsigned pos = 0; pos < size; ++pos)
if( vol != 256 )
{
/* Scale volume and add. */
mixbuf[pos] += buf[pos] * vol;
for(unsigned pos = 0; pos < size; ++pos)
mixbuf[pos] += buf[pos] * vol;
} else {
/* Just add. */
for(unsigned pos = 0; pos < size; ++pos)
mixbuf[pos] += buf[pos];
}
}
void SoundMixBuffer::read(Sint16 *buf)
{
for(unsigned pos = 0; pos < used; ++pos)
if( vol != 256 )
{
Sint32 out = (mixbuf[pos]) / 256;
out = clamp(out, -32768, 32767);
buf[pos] = Sint16(out);
for( unsigned pos = 0; pos < used; ++pos )
{
Sint32 out = (mixbuf[pos]) / 256;
buf[pos] = (Sint16) clamp( out, -32768, 32767 );
}
} else {
for( unsigned pos = 0; pos < used; ++pos )
buf[pos] = (Sint16) clamp( mixbuf[pos], -32768, 32767 );
}
used = 0;
}
void SoundMixBuffer::read( float *buf )
{
int Minimum = -32768;
int Maximum = 32767;
if( vol != 256 )
{
Minimum *= 256;
Maximum *= 256;
}
for( unsigned pos = 0; pos < used; ++pos )
buf[pos] = SCALE( float(mixbuf[pos]), Minimum, Maximum, -1.0f, 1.0f );
used = 0;
}