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optimizion for small chunksizes

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This commit is contained in:
Glenn Maynard
2004-03-25 02:24:39 +00:00
parent 4e5a4a8ad2
commit 9a74f9be01
1 changed files with 16 additions and 4 deletions
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stepmania/src/RageSound.cpp
+16 -4
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@@ -197,6 +197,9 @@ void RageSound::Update(float delta)
// if( playing && delta )
// FillBuf(int(delta * GetSampleRate() * framesize));
/* Erase old pos_map data. */
CleanPosMap( pos_map );
}
/* Return the number of bytes available in the input buffer. */
@@ -504,11 +507,20 @@ bool RageSound::GetDataToPlay( int16_t *buffer, int size, int &sound_frame, int
void RageSound::CommitPlayingPosition( int64_t frameno, int pos, int got_frames )
{
LockMut(SOUNDMAN->lock);
pos_map_t p( frameno, pos, got_frames );
pos_map.push_back( p );
/* Erase old pos_map data. */
CleanPosMap( pos_map );
if( pos_map.size() )
{
/* Optimization: If the last entry lines up with this new entry, just merge them. */
pos_map_t &last = pos_map.back();
if( last.frameno+last.frames == frameno &&
last.position+last.frames == pos )
{
last.frames += got_frames;
return;
}
}
pos_map.push_back( pos_map_t( frameno, pos, got_frames ) );
}
/* Called by the mixer: return a block of sound data.