From aa713fcd833a037290e92ba59500354cba7f6cbb Mon Sep 17 00:00:00 2001
From: Tim Mayberry <mojofunk@gmail.com>
Date: Sun, 27 Sep 2015 08:53:19 +1000
Subject: [PATCH] Return meaningful error codes when PortaudioBackend fails to
 start

So they can be used to give a contextual error message in the GUI
---
 libs/backends/portaudio/portaudio_backend.cc | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/libs/backends/portaudio/portaudio_backend.cc b/libs/backends/portaudio/portaudio_backend.cc
index b1c83349ae..3c8a238d71 100644
--- a/libs/backends/portaudio/portaudio_backend.cc
+++ b/libs/backends/portaudio/portaudio_backend.cc
@@ -480,8 +480,14 @@ PortAudioBackend::_start (bool for_latency_measurement)
 	switch (err) {
 	case paNoError:
 		break;
+	case paBadIODeviceCombination:
+		return DeviceConfigurationNotSupportedError;
+	case paInvalidChannelCount:
+		return ChannelCountNotSupportedError;
+	case paInvalidSampleRate:
+		return SampleRateNotSupportedError;
 	default:
-		return -1;
+		return AudioDeviceOpenError;
 	}
 
 	if (_n_outputs != _pcmio->n_playback_channels ()) {