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Code Issues Packages Projects Releases 2 Wiki Activity

Issue #59 - reorganizes management of the libusb transfers queue to

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better handle processing and shutdowns.

-Reuses transfers between tuner start/stop invocations

-Moves libusb transfer status direct byte buffer allocation out of
buffer processing thread and reuses it, saving a lot of memory
allocations over time.
This commit is contained in:
denny
2016-02-26 14:35:34 -05:00
parent 22d3871d0b
commit 5f2d8c8fe6
1 changed files with 76 additions and 38 deletions
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114
src/source/tuner/rtl/RTL2832TunerController.java
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@@ -27,6 +27,7 @@ import java.nio.charset.Charset;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.LinkedTransferQueue;
import java.util.concurrent.ScheduledFuture;
@@ -1378,9 +1379,13 @@ public abstract class RTL2832TunerController extends TunerController
public class BufferProcessor implements Runnable, TransferCallback
{
private ScheduledFuture<?> mSampleDispatcherTask;
private LinkedTransferQueue<Transfer> mAvailableTransfers;
private LinkedTransferQueue<Transfer> mTransfersInProgress = new LinkedTransferQueue<>();
private CopyOnWriteArrayList<Transfer> mTransfers;
private AtomicBoolean mRunning = new AtomicBoolean();
private ThreadPoolManager mThreadPoolManager;
private ByteBuffer mLibUsbHandlerStatus;
private boolean mCancel = false;
public BufferProcessor( ThreadPoolManager manager )
{
@@ -1407,18 +1412,6 @@ public abstract class RTL2832TunerController extends TunerController
prepareTransfers();
for( Transfer transfer: mTransfers )
{
int result = LibUsb.submitTransfer( transfer );
if( result != LibUsb.SUCCESS )
{
mLog.error( "error submitting transfer [" +
LibUsb.errorName( result ) + "]" );
break;
}
}
try
{
mSampleDispatcherTask = mThreadPoolManager.scheduleFixedRate(
@@ -1429,20 +1422,62 @@ public abstract class RTL2832TunerController extends TunerController
{
mLog.error( "NPE! = tpm null: " + ( mThreadPoolManager == null ), npe );
}
while( mRunning.get() )
mLibUsbHandlerStatus = ByteBuffer.allocateDirect( 4 );
List<Transfer> transfers = new ArrayList<>();
mCancel = false;
while( mRunning.get() )
{
ByteBuffer completed = ByteBuffer.allocateDirect( 4 );
mAvailableTransfers.drainTo( transfers );
for( Transfer transfer: transfers )
{
int result = LibUsb.submitTransfer( transfer );
if( result == LibUsb.SUCCESS )
{
mTransfersInProgress.add( transfer );
}
else
{
mLog.error( "Error submitting transfer [" +
LibUsb.errorName( result ) + "]" );
}
}
int result = LibUsb.handleEventsTimeoutCompleted(
null, TIMEOUT_US, completed.asIntBuffer() );
null, TIMEOUT_US, mLibUsbHandlerStatus.asIntBuffer() );
if( result != LibUsb.SUCCESS )
{
mLog.error( "error handling events for libusb" );
}
transfers.clear();
mLibUsbHandlerStatus.rewind();
}
if( mCancel )
{
for( Transfer transfer: mTransfersInProgress )
{
LibUsb.cancelTransfer( transfer );
}
int result = LibUsb.handleEventsTimeoutCompleted(
null, TIMEOUT_US, mLibUsbHandlerStatus.asIntBuffer() );
if( result != LibUsb.SUCCESS )
{
mLog.error( "error handling events for libusb" );
}
mLibUsbHandlerStatus.rewind();
}
}
}
@@ -1451,10 +1486,10 @@ public abstract class RTL2832TunerController extends TunerController
*/
public void stop()
{
mCancel = true;
if( mRunning.compareAndSet( true, false ) )
{
cancel();
if( mSampleDispatcherTask != null )
{
mThreadPoolManager.cancel( mSampleDispatcherTask );
@@ -1475,6 +1510,8 @@ public abstract class RTL2832TunerController extends TunerController
@Override
public void processTransfer( Transfer transfer )
{
mTransfersInProgress.remove( transfer );
switch( transfer.status() )
{
case LibUsb.TRANSFER_COMPLETED:
@@ -1564,30 +1601,31 @@ public abstract class RTL2832TunerController extends TunerController
*/
private void prepareTransfers() throws LibUsbException
{
mTransfers = new CopyOnWriteArrayList<Transfer>();
for( int x = 0; x < TRANSFER_BUFFER_POOL_SIZE; x++ )
if( mAvailableTransfers == null )
{
Transfer transfer = LibUsb.allocTransfer();
if( transfer == null )
{
throw new LibUsbException( "couldn't allocate transfer",
LibUsb.ERROR_NO_MEM );
}
mAvailableTransfers = new LinkedTransferQueue<>();
for( int x = 0; x < TRANSFER_BUFFER_POOL_SIZE; x++ )
{
Transfer transfer = LibUsb.allocTransfer();
if( transfer == null )
{
throw new LibUsbException( "couldn't allocate transfer",
LibUsb.ERROR_NO_MEM );
}
mAvailableTransfers.add( transfer );
}
}
for( Transfer transfer: mAvailableTransfers )
{
final ByteBuffer buffer =
ByteBuffer.allocateDirect( mBufferSize );
LibUsb.fillBulkTransfer( transfer,
mDeviceHandle,
BULK_ENDPOINT_IN,
buffer,
BufferProcessor.this,
"Buffer #" + x,
TIMEOUT_US );
mTransfers.add( transfer );
LibUsb.fillBulkTransfer( transfer, mDeviceHandle, BULK_ENDPOINT_IN,
buffer, BufferProcessor.this, "Buffer", TIMEOUT_US );
}
}
}