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don't bother checking for minor underruns if we have a major underrun

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Glenn Maynard
2004-09-10 01:49:39 +00:00
parent 7c60eeb61b
commit ecc5493c88
1 changed files with 13 additions and 8 deletions
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stepmania/src/arch/Sound/DSoundHelpers.cpp
+13 -8
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@@ -365,19 +365,23 @@ void DSoundBuf::CheckUnderrun( int cursorstart, int cursorend, int chunksize )
* Realign. */
if( buffer_bytes_filled == 0 )
{
/* There's no data filled at all. We've completely underrun. */
/* XXX */
/* There's no data filled at all. We've completely underrun. Pretend that
* the prefetch is full, and point our write cursor just after it. This way,
* we don't write into the prefetch; doing so shouldn't cause problems, but
* let's play it safe. Pretending the prefetch is full (instead of just moving
* the write cursor) takes us out of a "major underrun" state. */
int missed_by = cursorend - write_cursor;
wrap( missed_by, buffersize );
int first_byte_filled = write_cursor-buffer_bytes_filled;
wrap( first_byte_filled, buffersize );
LOG->Trace("major underrun: %i..%i filled but cursor at %i..%i (missed it by %i) %i/%i",
first_byte_filled, write_cursor, cursorstart, cursorend,
missed_by, buffer_bytes_filled, buffersize);
LOG->Trace( "major underrun: %i..%i filled but cursor at %i..%i (missed it by %i)",
first_byte_filled, write_cursor, cursorstart, cursorend, missed_by );
write_cursor = cursorstart;
write_cursor = cursorend;
buffer_bytes_filled = int(cursorend) - cursorstart;
wrap( buffer_bytes_filled, buffersize );
return;
}
/*
@@ -405,8 +409,9 @@ void DSoundBuf::CheckUnderrun( int cursorstart, int cursorend, int chunksize )
* ....pppp....
* 5: ....ff...... valid
* ....pppp....
* 6: ............ valid (no data filled)
* 6: ............
* ....pppp....
* invalid: buffer_bytes_filled == 0; we handled this above
*/
int first_byte_filled = write_cursor-buffer_bytes_filled;
wrap( first_byte_filled, buffersize );