Use closest sample rate in AudioIO::openStream()

src/audio.cpp

@@ -130,12 +130,19 @@ void AudioIO::openStream() {
 		RtAudio::StreamOptions options;
 		// options.flags |= RTAUDIO_SCHEDULE_REALTIME;
 
+		int closestSampleRate = deviceInfo.preferredSampleRate;
+		for (int sr : deviceInfo.sampleRates) {
+			if (abs(sr - sampleRate) < abs(closestSampleRate - sampleRate)) {
+				closestSampleRate = sr;
+			}
+		}
+
 		try {
 			debug("Opening audio stream %d", device);
 			stream->openStream(
 				numOutputs == 0 ? NULL : &outParameters,
 				numInputs == 0 ? NULL : &inParameters,
-				RTAUDIO_FLOAT32, sampleRate, (unsigned int*) &blockSize, &rtCallback, this, &options, NULL);
+				RTAUDIO_FLOAT32, closestSampleRate, (unsigned int*) &blockSize, &rtCallback, this, &options, NULL);
 		}
 		catch (RtAudioError &e) {
 			warn("Failed to open audio stream: %s", e.what());

src/core/AudioInterface.cpp

@@ -96,8 +96,8 @@ struct AudioInterface : Module {
 
 	AudioInterfaceIO audioIO;
 
-	SampleRateConverter<8> inputSrc;
-	SampleRateConverter<8> outputSrc;
+	SampleRateConverter<MAX_INPUTS> inputSrc;
+	SampleRateConverter<MAX_OUTPUTS> outputSrc;
 
 	// in rack's sample rate
 	DoubleRingBuffer<Frame<MAX_INPUTS>, 16> inputBuffer;
@@ -107,8 +107,6 @@ struct AudioInterface : Module {
 	}
 
 	void step() override;
-	void stepStream(const float *input, float *output, int numFrames);
-
 
 	json_t *toJson() override {
 		json_t *rootJ = json_object();