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add Extend()

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cleanup/comment
This commit is contained in:
Glenn Maynard
2004-10-25 00:48:16 +00:00
parent b364bb830b
commit fd813fe667
2 changed files with 18 additions and 3 deletions
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stepmania/src/RageSoundMixBuffer.cpp
+13 -3
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@@ -20,14 +20,16 @@ void RageSoundMixBuffer::SetVolume( float f )
m_iVolumeFactor = int(256*f);
}
/* write() will start mixing iOffset samples into the buffer. Be careful; this is
* measured in samples, not frames, so if the data is stereo, multiply by two. */
void RageSoundMixBuffer::SetWriteOffset( int iOffset )
{
m_iOffset = iOffset;
}
void RageSoundMixBuffer::write( const int16_t *buf, unsigned size )
void RageSoundMixBuffer::Extend( unsigned iSamples )
{
const unsigned realsize = size+m_iOffset;
const unsigned realsize = iSamples+m_iOffset;
if( m_iBufSize < realsize )
{
m_pMixbuf = (int32_t *) realloc( m_pMixbuf, sizeof(int32_t) * realsize );
@@ -39,10 +41,18 @@ void RageSoundMixBuffer::write( const int16_t *buf, unsigned size )
memset( m_pMixbuf + m_iBufUsed, 0, (realsize - m_iBufUsed) * sizeof(int32_t) );
m_iBufUsed = realsize;
}
}
void RageSoundMixBuffer::write( const int16_t *buf, unsigned size )
{
Extend( size );
/* Scale volume and add. */
int32_t *pBuf = m_pMixbuf+m_iOffset;
for( unsigned pos = 0; pos < size; ++pos )
m_pMixbuf[pos+m_iOffset] += buf[pos] * m_iVolumeFactor;
{
*pBuf += buf[pos] * m_iVolumeFactor; ++pBuf;
}
}
void RageSoundMixBuffer::read( int16_t *buf )