Fix high CPU usage by PulseAudio backend when stream is stopped

diff --git a/RtAudio.cpp b/RtAudio.cpp
index e0713a0d58b7f3496f25884fa473c9e4b9bf2a5c..1df152b7ec96d8dfe206a9542037ff49b5528f2b 100644 (file)
--- a/RtAudio.cpp
+++ b/RtAudio.cpp
@@ -8679,15 +8679,18 @@ void RtApiPulse::stopStream( void )
   stream_.state = STREAM_STOPPED;
   MUTEX_LOCK( &stream_.mutex );
 
-  if ( pah && pah->s_play ) {
-    int pa_error;
-    if ( pa_simple_drain( pah->s_play, &pa_error ) < 0 ) {
-      errorStream_ << "RtApiPulse::stopStream: error draining output device, " <<
-        pa_strerror( pa_error ) << ".";
-      errorText_ = errorStream_.str();
-      MUTEX_UNLOCK( &stream_.mutex );
-      error( RtAudioError::SYSTEM_ERROR );
-      return;
+  if ( pah ) {
+    pah->runnable = false;
+    if ( pah->s_play ) {
+      int pa_error;
+      if ( pa_simple_drain( pah->s_play, &pa_error ) < 0 ) {
+        errorStream_ << "RtApiPulse::stopStream: error draining output device, " <<
+          pa_strerror( pa_error ) << ".";
+        errorText_ = errorStream_.str();
+        MUTEX_UNLOCK( &stream_.mutex );
+        error( RtAudioError::SYSTEM_ERROR );
+        return;
+      }
     }
   }
 
@@ -8713,15 +8716,18 @@ void RtApiPulse::abortStream( void )
   stream_.state = STREAM_STOPPED;
   MUTEX_LOCK( &stream_.mutex );
 
-  if ( pah && pah->s_play ) {
-    int pa_error;
-    if ( pa_simple_flush( pah->s_play, &pa_error ) < 0 ) {
-      errorStream_ << "RtApiPulse::abortStream: error flushing output device, " <<
-        pa_strerror( pa_error ) << ".";
-      errorText_ = errorStream_.str();
-      MUTEX_UNLOCK( &stream_.mutex );
-      error( RtAudioError::SYSTEM_ERROR );
-      return;
+  if ( pah ) {
+    pah->runnable = false;
+    if ( pah->s_play ) {
+      int pa_error;
+      if ( pa_simple_flush( pah->s_play, &pa_error ) < 0 ) {
+        errorStream_ << "RtApiPulse::abortStream: error flushing output device, " <<
+          pa_strerror( pa_error ) << ".";
+        errorText_ = errorStream_.str();
+        MUTEX_UNLOCK( &stream_.mutex );
+        error( RtAudioError::SYSTEM_ERROR );
+        return;
+      }
     }
   }