Replace libsamplerate with libspeexdsp for sample rate conversion.

Makefile

@@ -14,7 +14,7 @@ ifeq ($(ARCH), lin)
 	LDFLAGS += -rdynamic \
 		-lpthread -lGL -ldl \
 		$(shell pkg-config --libs gtk+-2.0) \
-		-Ldep/lib -lGLEW -lglfw -ljansson -lsamplerate -lcurl -lzip -lrtaudio -lrtmidi
+		-Ldep/lib -lGLEW -lglfw -ljansson -lspeexdsp -lcurl -lzip -lrtaudio -lrtmidi
 	TARGET = Rack
 endif
 
@@ -23,7 +23,7 @@ ifeq ($(ARCH), mac)
 	CXXFLAGS += -DAPPLE -stdlib=libc++
 	LDFLAGS += -stdlib=libc++ -lpthread -ldl \
 		-framework Cocoa -framework OpenGL -framework IOKit -framework CoreVideo \
-		-Ldep/lib -lGLEW -lglfw -ljansson -lsamplerate -lcurl -lzip -lrtaudio -lrtmidi
+		-Ldep/lib -lGLEW -lglfw -ljansson -lspeexdsp -lcurl -lzip -lrtaudio -lrtmidi
 	TARGET = Rack
 	BUNDLE = dist/$(TARGET).app
 endif
@@ -34,7 +34,7 @@ ifeq ($(ARCH), win)
 		-Wl,--export-all-symbols,--out-implib,libRack.a -mwindows \
 		-lgdi32 -lopengl32 -lcomdlg32 -lole32 \
 		-Ldep/lib -lglew32 -lglfw3dll -lcurl -lzip -lrtaudio -lrtmidi \
-		-Wl,-Bstatic -ljansson -lsamplerate
+		-Wl,-Bstatic -ljansson -lspeexdsp
 	TARGET = Rack.exe
 	OBJECTS = Rack.res
 endif
@@ -109,7 +109,7 @@ ifeq ($(ARCH), mac)
 	cp dep/lib/libGLEW.2.1.0.dylib $(BUNDLE)/Contents/MacOS/
 	cp dep/lib/libglfw.3.dylib $(BUNDLE)/Contents/MacOS/
 	cp dep/lib/libjansson.4.dylib $(BUNDLE)/Contents/MacOS/
-	cp dep/lib/libsamplerate.0.dylib $(BUNDLE)/Contents/MacOS/
+	cp dep/lib/libspeexdsp.1.dylib $(BUNDLE)/Contents/MacOS/
 	cp dep/lib/libcurl.4.dylib $(BUNDLE)/Contents/MacOS/
 	cp dep/lib/libzip.5.dylib $(BUNDLE)/Contents/MacOS/
 	cp dep/lib/librtmidi.4.dylib $(BUNDLE)/Contents/MacOS/
@@ -118,7 +118,7 @@ ifeq ($(ARCH), mac)
 	install_name_tool -change /usr/local/lib/libGLEW.2.1.0.dylib @executable_path/libGLEW.2.1.0.dylib $(BUNDLE)/Contents/MacOS/Rack
 	install_name_tool -change lib/libglfw.3.dylib @executable_path/libglfw.3.dylib $(BUNDLE)/Contents/MacOS/Rack
 	install_name_tool -change $(PWD)/dep/lib/libjansson.4.dylib @executable_path/libjansson.4.dylib $(BUNDLE)/Contents/MacOS/Rack
-	install_name_tool -change $(PWD)/dep/lib/libsamplerate.0.dylib @executable_path/libsamplerate.0.dylib $(BUNDLE)/Contents/MacOS/Rack
+	install_name_tool -change $(PWD)/dep/lib/libspeexdsp.1.dylib @executable_path/libspeexdsp.1.dylib $(BUNDLE)/Contents/MacOS/Rack
 	install_name_tool -change $(PWD)/dep/lib/libcurl.4.dylib @executable_path/libcurl.4.dylib $(BUNDLE)/Contents/MacOS/Rack
 	install_name_tool -change $(PWD)/dep/lib/libzip.5.dylib @executable_path/libzip.5.dylib $(BUNDLE)/Contents/MacOS/Rack
 	install_name_tool -change $(PWD)/dep/lib/librtmidi.4.dylib @executable_path/librtmidi.4.dylib $(BUNDLE)/Contents/MacOS/Rack
@@ -146,7 +146,7 @@ ifeq ($(ARCH), win)
 	cp dep/bin/libcurl-4.dll dist/Rack/
 	cp dep/bin/libjansson-4.dll dist/Rack/
 	cp dep/bin/librtmidi-4.dll dist/Rack/
-	cp dep/bin/libsamplerate-0.dll dist/Rack/
+	cp dep/bin/libspeexdsp.dll dist/Rack/
 	cp dep/bin/libzip-5.dll dist/Rack/
 	cp dep/bin/librtaudio.dll dist/Rack/
 	mkdir -p dist/Rack/plugins
@@ -161,7 +161,7 @@ ifeq ($(ARCH), lin)
 	mkdir -p dist/Rack
 	cp -R LICENSE* res dist/Rack/
 	cp Rack Rack.sh dist/Rack/
-	cp dep/lib/libsamplerate.so.0 dist/Rack/
+	cp dep/lib/libspeexdsp.so dist/Rack/
 	cp dep/lib/libjansson.so.4 dist/Rack/
 	cp dep/lib/libGLEW.so.2.1 dist/Rack/
 	cp dep/lib/libglfw.so.3 dist/Rack/

dep/Makefile

@@ -26,7 +26,7 @@ ifeq ($(ARCH),lin)
 	glew = lib/libGLEW.so
 	glfw = lib/libglfw.so
 	jansson = lib/libjansson.so
-	libsamplerate = lib/libsamplerate.so
+	libspeexdsp = lib/libspeexdsp.so
 	libcurl = lib/libcurl.so
 	libzip = lib/libzip.so
 	rtmidi = lib/librtmidi.so
@@ -37,7 +37,7 @@ ifeq ($(ARCH),mac)
 	glew = lib/libGLEW.dylib
 	glfw = lib/libglfw.dylib
 	jansson = lib/libjansson.dylib
-	libsamplerate = lib/libsamplerate.dylib
+	libspeexdsp = lib/libspeexdsp.dylib
 	libcurl = lib/libcurl.dylib
 	libzip = lib/libzip.dylib
 	rtmidi = lib/librtmidi.dylib
@@ -48,7 +48,7 @@ ifeq ($(ARCH),win)
 	glew = bin/glew32.dll
 	glfw = bin/glfw3.dll
 	jansson = bin/libjansson-4.dll
-	libsamplerate = bin/libsamplerate-0.dll
+	libspeexdsp = bin/libspeexdsp.dll
 	libcurl = bin/libcurl-4.dll
 	libzip = bin/libzip-5.dll
 	rtmidi = bin/librtmidi-4.dll
@@ -71,7 +71,7 @@ endif
 
 .NOTPARALLEL:
 
-all: $(glew) $(glfw) $(jansson) $(libsamplerate) $(libcurl) $(libzip) $(rtmidi) $(rtaudio)
+all: $(glew) $(glfw) $(jansson) $(libspeexdsp) $(libcurl) $(libzip) $(rtmidi) $(rtaudio)
 	@echo ""
 	@echo "#######################################"
 	@echo "# Built all dependencies successfully #"
@@ -99,12 +99,12 @@ $(jansson):
 	$(MAKE) -C jansson-2.10
 	$(MAKE) -C jansson-2.10 install
 
-$(libsamplerate):
-	$(WGET) http://www.mega-nerd.com/SRC/libsamplerate-0.1.9.tar.gz
-	$(UNTAR) libsamplerate-0.1.9.tar.gz
-	cd libsamplerate-0.1.9 && ./configure --prefix="$(LOCAL)" --disable-fftw --disable-sndfile
-	$(MAKE) -C libsamplerate-0.1.9/src
-	$(MAKE) -C libsamplerate-0.1.9/src install
+$(libspeexdsp):
+	$(WGET) https://github.com/xiph/speexdsp/archive/SpeexDSP-1.2rc3.tar.gz
+	$(UNTAR) SpeexDSP-1.2rc3.tar.gz
+	cd speexdsp-SpeexDSP-1.2rc3 && ./autogen.sh && ./configure --prefix="$(LOCAL)"
+	$(MAKE) -C speexdsp-SpeexDSP-1.2rc3
+	$(MAKE) -C speexdsp-SpeexDSP-1.2rc3 install
 
 $(libcurl):
 	$(WGET) https://github.com/curl/curl/releases/download/curl-7_56_0/curl-7.56.0.tar.gz

include/dsp/samplerate.hpp

@@ -1,8 +1,7 @@
 #pragma once
 
 #include <assert.h>
-#include <samplerate.h>
-#include <string.h>
+#include <speex/speex_resampler.h>
 #include "frame.hpp"
 
 
@@ -10,50 +9,45 @@ namespace rack {
 
 template<int CHANNELS>
 struct SampleRateConverter {
-	SRC_STATE *state;
-	SRC_DATA data;
+	SpeexResamplerState *state = NULL;
+	bool noConversion = true;
 
 	SampleRateConverter() {
 		int error;
-		state = src_new(SRC_SINC_FASTEST, CHANNELS, &error);
-		assert(!error);
-
-		data.src_ratio = 1.0;
-		data.end_of_input = false;
+		state = speex_resampler_init(CHANNELS, 44100, 44100, SPEEX_RESAMPLER_QUALITY_DEFAULT, &error);
+		assert(error == RESAMPLER_ERR_SUCCESS);
 	}
 	~SampleRateConverter() {
-		src_delete(state);
+		speex_resampler_destroy(state);
 	}
-	/** output_sample_rate / input_sample_rate */
-	void setRatio(float r) {
-		src_set_ratio(state, r);
-		data.src_ratio = r;
+
+	void setRates(float inRate, float outRate) {
+		int error = speex_resampler_set_rate(state, inRate, outRate);
+		assert(error == RESAMPLER_ERR_SUCCESS);
+		noConversion = inRate == outRate;
 	}
-	void setRatioSmooth(float r) {
-		data.src_ratio = r;
+
+	void setRatioSmooth(float ratio) DEPRECATED {
+		// FIXME: this doesn't do a smooth change -- speex doesn't appear to support that.
+		const int base = 1000;
+		setRates(base, ratio * base);
 	}
+
 	/** `in` and `out` are interlaced with the number of channels */
 	void process(const Frame<CHANNELS> *in, int *inFrames, Frame<CHANNELS> *out, int *outFrames) {
-		/*
-		if (nearf(data.src_ratio, 1.0)) {
-			int len = mini(*inFrames, *outFrames);
+		if (noConversion) {
+			int len = std::min(*inFrames, *outFrames);
 			memcpy(out, in, len * sizeof(Frame<CHANNELS>));
 			*inFrames = len;
 			*outFrames = len;
 			return;
 		}
-		*/
-		// Old versions of libsamplerate use float* here instead of const float*
-		data.data_in = (float*) in;
-		data.input_frames = *inFrames;
-		data.data_out = (float*) out;
-		data.output_frames = *outFrames;
-		src_process(state, &data);
-		*inFrames = data.input_frames_used;
-		*outFrames = data.output_frames_gen;
+		speex_resampler_process_interleaved_float(state, (const float*)in, (unsigned int*)inFrames, (float*)out, (unsigned int*)outFrames);
 	}
+
 	void reset() {
-		src_reset(state);
+		int error = speex_resampler_reset_mem(state);
+		assert(error == RESAMPLER_ERR_SUCCESS);
 	}
 };
 

src/core/AudioInterface.cpp

@@ -169,7 +169,7 @@ void AudioInterface::step() {
 		// Once full, sample rate convert the input
 		// inputBuffer -> SRC -> inputSrcBuffer
 		if (inputBuffer.full()) {
-			inputSrc.setRatio(sampleRate / engineGetSampleRate());
+			inputSrc.setRates(engineGetSampleRate(), sampleRate);
 			int inLen = inputBuffer.size();
 			int outLen = inputSrcBuffer.capacity();
 			inputSrc.process(inputBuffer.startData(), &inLen, inputSrcBuffer.endData(), &outLen);
@@ -211,7 +211,7 @@ void AudioInterface::stepStream(const float *input, float *output, int numFrames
 		}
 
 		// Pass output through sample rate converter
-		outputSrc.setRatio(engineGetSampleRate() / sampleRate);
+		outputSrc.setRates(sampleRate, engineGetSampleRate());
 		int inLen = numFrames;
 		int outLen = outputBuffer.capacity();
 		outputSrc.process(inputFrames, &inLen, outputBuffer.endData(), &outLen);