From ee94b95a993d091d1ab7826951498b03bb6dbbbc Mon Sep 17 00:00:00 2001
From: Gary Scavone <gary@music.mcgill.ca>
Date: Thu, 24 Jan 2008 20:26:40 +0000
Subject: Various updates in ALSA for probing while device is open and in
 Windows for thread priority (gps).

---
 RtAudio.cpp | 36 +++++++++++++++++++++++++++++++++---
 1 file changed, 33 insertions(+), 3 deletions(-)

(limited to 'RtAudio.cpp')

diff --git a/RtAudio.cpp b/RtAudio.cpp
index de7219f..f879244 100644
--- a/RtAudio.cpp
+++ b/RtAudio.cpp
@@ -3683,8 +3683,10 @@ bool RtApiDs :: probeDeviceOpen( unsigned int device, StreamMode mode, unsigned
     while ( dsPointerLeadTime * 2U > (DWORD) bufferBytes )
       bufferBytes *= 2;
 
-    // Set cooperative level to DSSCL_EXCLUSIVE
-    result = output->SetCooperativeLevel( hWnd, DSSCL_EXCLUSIVE );
+    // Set cooperative level to DSSCL_EXCLUSIVE ... sound stops when window focus changes.
+    //result = output->SetCooperativeLevel( hWnd, DSSCL_EXCLUSIVE );
+    // Set cooperative level to DSSCL_PRIORITY ... sound remains when window focus changes.
+    result = output->SetCooperativeLevel( hWnd, DSSCL_PRIORITY );
     if ( FAILED( result ) ) {
       output->Release();
       errorStream_ << "RtApiDs::probeDeviceOpen: error (" << getErrorString( result ) << ") setting cooperative level (" << dsinfo.name << ")!";
@@ -4938,6 +4940,18 @@ RtAudio::DeviceInfo RtApiAlsa :: getDeviceInfo( unsigned int device )
 
  foundDevice:
 
+  // If a stream is already open, we cannot probe the stream devices.
+  // Thus, use the saved results.
+  if ( stream_.state != STREAM_CLOSED &&
+       ( stream_.device[0] == device || stream_.device[1] == device ) ) {
+    if ( device >= devices_.size() ) {
+      errorText_ = "RtApiAlsa::getDeviceInfo: device ID was not present before stream was opened.";
+      error( RtError::WARNING );
+      return info;
+    }
+    return devices_[ device ];
+  }
+
   int openMode = SND_PCM_ASYNC;
   snd_pcm_stream_t stream;
 	snd_pcm_info_t *pcminfo;
@@ -5132,6 +5146,16 @@ RtAudio::DeviceInfo RtApiAlsa :: getDeviceInfo( unsigned int device )
   return info;
 }
 
+void RtApiAlsa :: saveDeviceInfo( void )
+{
+  devices_.clear();
+
+  unsigned int nDevices = getDeviceCount();
+  devices_.resize( nDevices );
+  for ( unsigned int i=0; i<nDevices; i++ )
+    devices_[i] = getDeviceInfo( i );
+}
+
 bool RtApiAlsa :: probeDeviceOpen( unsigned int device, StreamMode mode, unsigned int channels,
                                    unsigned int firstChannel, unsigned int sampleRate,
                                    RtAudioFormat format, unsigned int *bufferSize,
@@ -5191,6 +5215,12 @@ bool RtApiAlsa :: probeDeviceOpen( unsigned int device, StreamMode mode, unsigne
 
  foundDevice:
 
+  // The getDeviceInfo() function will not work for a device that is
+  // already open.  Thus, we'll probe the system before opening a
+  // stream and save the results for use by getDeviceInfo().
+  if ( mode == OUTPUT || ( mode == INPUT && stream_.mode != OUTPUT ) ) // only do once
+    this->saveDeviceInfo();
+
   snd_pcm_stream_t stream;
   if ( mode == OUTPUT )
     stream = SND_PCM_STREAM_PLAYBACK;
@@ -6911,7 +6941,7 @@ void RtApi :: clearStreamInfo()
   stream_.callbackInfo.userData = 0;
   stream_.callbackInfo.isRunning = false;
   for ( int i=0; i<2; i++ ) {
-    stream_.device[i] = 0;
+    stream_.device[i] = 11111;
     stream_.doConvertBuffer[i] = false;
     stream_.deviceInterleaved[i] = true;
     stream_.doByteSwap[i] = false;
-- 
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