diff --git a/inputsource.cpp b/inputsource.cpp
index 2cb1c31..9761612 100644
--- a/inputsource.cpp
+++ b/inputsource.cpp
@@ -48,14 +48,15 @@ InputSource::~InputSource() {
     fclose(m_file);
 }
 
-bool InputSource::getSamples(std::complex<float> *dest, off_t start, off_t length)
+std::unique_ptr<std::complex<float>[]> InputSource::getSamples(off_t start, off_t length)
 {
     if(start < 0 || length < 0)
-        return false;
+        return nullptr;
 
     if (start + length >= sampleCount)
-        return false;
+        return nullptr;
 
-    memcpy(dest, &m_data[start], length * sizeof(std::complex<float>));
-    return true;
+    std::unique_ptr<std::complex<float>[]> dest(new std::complex<float>[length]);
+    memcpy(dest.get(), &m_data[start], length * sizeof(std::complex<float>));
+    return dest;
 }
diff --git a/inputsource.h b/inputsource.h
index d3e3bd6..d2ea3b1 100644
--- a/inputsource.h
+++ b/inputsource.h
@@ -34,6 +34,6 @@ public:
     InputSource(const char *filename);
     ~InputSource();
 
-    bool getSamples(std::complex<float> *dest, off_t start, off_t length);
+    std::unique_ptr<std::complex<float>[]> getSamples(off_t start, off_t length);
     off_t count() { return sampleCount; };
 };
diff --git a/samplebuffer.cpp b/samplebuffer.cpp
index 29607b3..47f92e5 100644
--- a/samplebuffer.cpp
+++ b/samplebuffer.cpp
@@ -19,10 +19,10 @@
 
 #include "samplebuffer.h"
 
-bool SampleBuffer::getSamples(std::complex<float> *dest, off_t start, off_t length)
+std::unique_ptr<std::complex<float>[]> SampleBuffer::getSamples(off_t start, off_t length)
 {
-	std::complex<float> buf[length];
-	src->getSamples(buf, start, length);
-	work(buf, dest, length);
-	return true;
+	auto samples = src->getSamples(start, length);
+	std::unique_ptr<std::complex<float>[]> dest(new std::complex<float>[length]);
+	work(samples.get(), dest.get(), length);
+	return dest;
 }
\ No newline at end of file
diff --git a/samplebuffer.h b/samplebuffer.h
index f2bc9cd..76a8160 100644
--- a/samplebuffer.h
+++ b/samplebuffer.h
@@ -30,7 +30,7 @@ private:
 
 public:
 	SampleBuffer(SampleSource *src) : src(src) {};
-	virtual bool getSamples(std::complex<float> *dest, off_t start, off_t length);
+	virtual std::unique_ptr<std::complex<float>[]> getSamples(off_t start, off_t length);
 	virtual void work(void *input, void *output, int count) = 0;
 	virtual off_t count() { return src->count(); };
 };
diff --git a/samplesource.h b/samplesource.h
index 523a43f..5ff629a 100644
--- a/samplesource.h
+++ b/samplesource.h
@@ -20,6 +20,7 @@
 #pragma once
 
 #include <complex>
+#include <memory>
 
 class SampleSource
 {
@@ -27,6 +28,6 @@ class SampleSource
 public:
     virtual ~SampleSource() {};
 
-    virtual bool getSamples(std::complex<float> *dest, off_t start, off_t length) = 0;
+    virtual std::unique_ptr<std::complex<float>[]> getSamples(off_t start, off_t length) = 0;
     virtual off_t count() = 0;
 };
diff --git a/spectrogram.cpp b/spectrogram.cpp
index f756473..c23afe5 100644
--- a/spectrogram.cpp
+++ b/spectrogram.cpp
@@ -143,15 +143,14 @@ float* Spectrogram::getFFTTile(off_t tile)
 void Spectrogram::getLine(float *dest, off_t sample)
 {
 	if (inputSource && fft) {
-		std::complex<float> buffer[fftSize];
-		inputSource->getSamples(buffer, sample, fftSize);
+		auto buffer = inputSource->getSamples(sample, fftSize);
 
 		for (int i = 0; i < fftSize; i++) {
 			buffer[i].real(buffer[i].real() * window[i]);
 			buffer[i].imag(buffer[i].imag() * window[i]);
 		}
 
-		fft->process(buffer, buffer);
+		fft->process(buffer.get(), buffer.get());
 		for (int i = 0; i < fftSize; i++) {
 			int k = (i + fftSize / 2) % fftSize;
 			float re = buffer[k].real();
diff --git a/waveformview.cpp b/waveformview.cpp
index 7ae8d18..e65a726 100644
--- a/waveformview.cpp
+++ b/waveformview.cpp
@@ -66,15 +66,12 @@ void WaveformView::paintEvent(QPaintEvent *event)
     painter.fillRect(rect, Qt::black);
 
     off_t length = lastSample - firstSample;
-    std::complex<float> *samples = new std::complex<float>[length];
-    sampleSource->getSamples(samples, firstSample, length);
+    auto samples = sampleSource->getSamples(firstSample, length);
 
     painter.setPen(Qt::red);
-    plot(&painter, reinterpret_cast<float*>(samples), length, 2);
+    plot(&painter, reinterpret_cast<float*>(samples.get()), length, 2);
     painter.setPen(Qt::blue);
-    plot(&painter, reinterpret_cast<float*>(samples)+1, length, 2);
-
-    delete[] samples;
+    plot(&painter, reinterpret_cast<float*>(samples.get())+1, length, 2);
 }
 
 void WaveformView::plot(QPainter *painter, float *samples, off_t count, int step = 1)