do not assume PortAudio on Linux was built with ALSA backend

hack around a PipeWire bug: https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/1547
mixxxdj · Aug 25, 2021 · f472ab2 · f472ab2
1 parent f2258d1
commit f472ab2
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Showing 2 changed files with 10 additions and 3 deletions.
diff --git a/cmake/modules/FindPortAudio.cmake b/cmake/modules/FindPortAudio.cmake
@@ -54,6 +54,11 @@ find_path(PortAudio_INCLUDE_DIR
   DOC "PortAudio include directory")
 mark_as_advanced(PortAudio_INCLUDE_DIR)
 
+find_path(PortAudio_ALSA_H
+  NAMES pa_linux_alsa.h
+  PATHS ${PC_PortAudio_INCLUDE_DIRS})
+mark_as_advanced(PortAudio_ALSA_H)
+
 find_library(PortAudio_LIBRARY
   NAMES portaudio
   PATHS ${PC_PortAudio_LIBRARY_DIRS}
@@ -78,5 +83,8 @@ if(PortAudio_FOUND)
         INTERFACE_COMPILE_OPTIONS "${PC_PortAudio_CFLAGS_OTHER}"
         INTERFACE_INCLUDE_DIRECTORIES "${PortAudio_INCLUDE_DIR}"
     )
+    if(PortAudio_ALSA_H)
+      target_compile_definitions(PortAudio::PortAudio INTERFACE PA_USE_ALSA)
+    endif()
   endif()
 endif()
diff --git a/src/soundio/sounddeviceportaudio.cpp b/src/soundio/sounddeviceportaudio.cpp
@@ -20,7 +20,7 @@
 #include "vinylcontrol/defs_vinylcontrol.h"
 #include "waveform/visualplayposition.h"
 
-#ifdef __LINUX__
+#ifdef PA_USE_ALSA
 // for PaAlsa_EnableRealtimeScheduling
 #include <pa_linux_alsa.h>
 #endif
@@ -333,8 +333,7 @@ SoundDeviceError SoundDevicePortAudio::open(bool isClkRefDevice, int syncBuffers
         qDebug() << "Opened PortAudio stream successfully... starting";
     }
 
-
-#ifdef __LINUX__
+#ifdef PA_USE_ALSA
     if (m_deviceTypeId == paALSA) {
         qInfo() << "Enabling ALSA real-time scheduling";
         PaAlsa_EnableRealtimeScheduling(pStream, 1);