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fix waveout underruns cascading into decode underruns because the

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decode buffer is smaller than the writeahead
This commit is contained in:
Glenn Maynard
2004-04-06 23:18:40 +00:00
parent 6702cfeba9
commit 3462de7511
3 changed files with 28 additions and 3 deletions
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stepmania/src/arch/Sound/RageSoundDriver_Generic_Software.cpp
+18 -3
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@@ -8,8 +8,7 @@
static const int channels = 2;
static const int bytes_per_frame = channels*2; /* 16-bit */
static const int frames_to_buffer = 4096;
static int frames_to_buffer;
static const int num_chunks = 8;
static int chunksize() { return frames_to_buffer / num_chunks; }
@@ -18,7 +17,10 @@ RageSound_Generic_Software::sound::sound()
{
snd = NULL;
state = STOPPED;
}
void RageSound_Generic_Software::sound::Init()
{
/* Reserve enough blocks in the buffer to hold the buffer; plus some extra, since blocks
* are partially read by Mix(); plus some more extra, since we can buffer one block
* over frames_to_buffer (we buffer until filled >= frames_to_buffer). */
@@ -294,13 +296,26 @@ void RageSound_Generic_Software::StopMixing( RageSoundBase *snd )
void RageSound_Generic_Software::StartDecodeThread()
{
ASSERT( !m_DecodeThread.IsCreated() );
/* Initialize the sound buffers, now that frames_to_buffer is finalized. */
for( unsigned i = 0; i < ARRAYSIZE(sounds); ++i )
sounds[i].Init();
m_DecodeThread.Create( DecodeThread_start, this );
}
void RageSound_Generic_Software::SetDecodeBufferSize( int frames )
{
ASSERT( !m_DecodeThread.IsCreated() );
frames_to_buffer = frames;
}
RageSound_Generic_Software::RageSound_Generic_Software()
{
shutdown_decode_thread = false;
SetDecodeBufferSize( 4096 );
m_DecodeThread.SetName("Decode thread");
}