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- Rewrite writing to common buffer to fix stuttering sound

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svn path=/trunk/; revision=39902
This commit is contained in:
Johannes Anderwald 2009-03-07 19:59:57 +00:00
parent 0da1e6e5e9
commit 4dd44cb8cd
1 changed files with 69 additions and 48 deletions
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117
reactos/drivers/wdm/audio/backpln/portcls/pin_wavecyclic.c
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@ -92,6 +92,73 @@ IServiceSink_fnRelease(
return This->ref;
}
static
VOID
UpdateCommonBuffer(
IPortPinWaveCyclicImpl * This,
ULONG Position)
{
ULONG BufferLength;
ULONG BytesToCopy;
ULONG BufferSize;
PUCHAR Buffer;
NTSTATUS Status;
BufferLength = Position - This->CommonBufferOffset;
while(BufferLength)
{
Status = This->IrpQueue->lpVtbl->GetMapping(This->IrpQueue, &Buffer, &BufferSize);
if (!NT_SUCCESS(Status))
return;
BytesToCopy = min(BufferLength, BufferSize);
This->DmaChannel->lpVtbl->CopyTo(This->DmaChannel,
(PUCHAR)This->CommonBuffer + This->CommonBufferOffset,
Buffer,
BytesToCopy);
This->IrpQueue->lpVtbl->UpdateMapping(This->IrpQueue, BytesToCopy);
This->CommonBufferOffset += BytesToCopy;
BufferLength = Position - This->CommonBufferOffset;
}
}
static
VOID
UpdateCommonBufferOverlap(
IPortPinWaveCyclicImpl * This,
ULONG Position)
{
ULONG BufferLength;
ULONG BytesToCopy;
ULONG BufferSize;
PUCHAR Buffer;
NTSTATUS Status;
BufferLength = This->CommonBufferSize - This->CommonBufferOffset;
while(BufferLength)
{
Status = This->IrpQueue->lpVtbl->GetMapping(This->IrpQueue, &Buffer, &BufferSize);
if (!NT_SUCCESS(Status))
return;
BytesToCopy = min(BufferLength, BufferSize);
This->DmaChannel->lpVtbl->CopyTo(This->DmaChannel,
(PUCHAR)This->CommonBuffer + This->CommonBufferOffset,
Buffer,
BytesToCopy);
This->IrpQueue->lpVtbl->UpdateMapping(This->IrpQueue, BytesToCopy);
This->CommonBufferOffset += BytesToCopy;
BufferLength = This->CommonBufferSize - This->CommonBufferOffset;
}
This->CommonBufferOffset = 0;
UpdateCommonBuffer(This, Position);
}
static
VOID
NTAPI
@ -99,7 +166,6 @@ IServiceSink_fnRequestService(
IServiceSink* iface)
{
ULONG Position;
ULONG BufferLength, BytesToCopy;
NTSTATUS Status;
PUCHAR Buffer;
ULONG BufferSize;
@ -134,57 +200,12 @@ IServiceSink_fnRequestService(
if (Position < This->CommonBufferOffset)
{
BufferLength = This->CommonBufferSize - This->CommonBufferOffset;
BytesToCopy = min(BufferLength, BufferSize);
DPRINT("Copying %u\n", BytesToCopy);
if (BytesToCopy)
{
This->DmaChannel->lpVtbl->CopyTo(This->DmaChannel, (PUCHAR)This->CommonBuffer + This->CommonBufferOffset, Buffer, BytesToCopy);
This->IrpQueue->lpVtbl->UpdateMapping(This->IrpQueue, BytesToCopy);
This->CommonBufferOffset = 0;
}
Status = This->IrpQueue->lpVtbl->GetMapping(This->IrpQueue, &Buffer, &BufferSize);
if (!NT_SUCCESS(Status))
{
DPRINT("IServiceSink_fnRequestService> Waiting for mapping\n");
This->ServiceGroup->lpVtbl->RequestDelayedService(This->ServiceGroup, -10000000L);
This->RetryCount++;
return;
}
BytesToCopy = min(Position, BufferSize);
DPRINT("Copying %u\n", BytesToCopy);
if (BytesToCopy)
{
This->DmaChannel->lpVtbl->CopyTo(This->DmaChannel, (PUCHAR)(PUCHAR)This->CommonBuffer, Buffer, BytesToCopy);
This->IrpQueue->lpVtbl->UpdateMapping(This->IrpQueue, BytesToCopy);
This->CommonBufferOffset = Position;
}
UpdateCommonBufferOverlap(This, Position);
}
else if (Position >= This->CommonBufferOffset)
{
BufferLength = Position - This->CommonBufferOffset;
BytesToCopy = min(BufferLength, BufferSize);
DPRINT("Copying %u\n", BytesToCopy);
This->DmaChannel->lpVtbl->CopyTo(This->DmaChannel,
(PUCHAR)This->CommonBuffer + This->CommonBufferOffset,
Buffer,
BytesToCopy);
This->IrpQueue->lpVtbl->UpdateMapping(This->IrpQueue, BytesToCopy);
This->CommonBufferOffset = Position;
UpdateCommonBuffer(This, Position);
}
}
static IServiceSinkVtbl vt_IServiceSink =