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diff --git a/radio_output.h b/radio_output.h
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+/*
+ * A standalone AM/FM Radio QML plugin (for RTL2832U and Maxim hardware)
+ * Copyright © 2015-2016 Manuel Bachmann <manuel.bachmann@iot.bzh>
+ * Copyright © 2016 Scott Murray <scott.murray@konsulko.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef RADIO_OUTPUT_H
+#define RADIO_OUTPUT_H
+
+#include <alsa/asoundlib.h>
+
+#include <pulse/simple.h>
+#include <pulse/error.h>
+
+ /*
+  * RadioOutputImplementation is a virtual class, with 2 implementations :
+  * - RadioOutputAlsa ;
+  * - RadioOutputPulse ;
+  */
+class RadioOutputImplementation
+{
+public:
+	RadioOutputImplementation() {};
+	virtual ~RadioOutputImplementation() {};
+
+	virtual bool play(void*, int) = 0;
+
+	bool works;
+};
+
+
+class RadioOutputAlsa : public RadioOutputImplementation
+{
+public:
+	RadioOutputAlsa();
+	~RadioOutputAlsa() override;
+
+private:
+	bool play(void *, int) override;
+
+	snd_pcm_t *dev;
+	snd_pcm_hw_params_t *hw_params;
+};
+
+class RadioOutputPulse : public RadioOutputImplementation
+{
+public:
+	RadioOutputPulse();
+	~RadioOutputPulse() override;
+
+private:
+	bool play(void *, int) override;
+
+	pa_simple *pa;
+	pa_sample_spec *pa_spec;
+
+	unsigned int extra;
+	int16_t extra_buf[1];
+	unsigned char *output_buf;
+};
+
+#endif  // RTLSDR_RADIO_H