Added AlsaOutputEngine

1 files changed, 62 insertions, 0 deletions

diff --git a/drumgizmo/output/alsa.h b/drumgizmo/output/alsa.h
new file mode 100644
index 0000000..c7585e0
--- /dev/null
+++ b/drumgizmo/output/alsa.h
@@ -0,0 +1,62 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            alsa.h
+ *
+ *  Do 21. Jan 16:48:32 CET 2016
+ *  Copyright 2016 Christian Glöckner
+ *  cgloeckner@freenet.de
+ ****************************************************************************/
+
+/*
+ *  This file is part of DrumGizmo.
+ *
+ *  DrumGizmo 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.
+ *
+ *  DrumGizmo 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 DrumGizmo; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#pragma once
+
+// Use the newer ALSA API
+#define ALSA_PCM_NEW_HW_PARAMS_API
+
+#include <audiotypes.h>
+#include <alsa/asoundlib.h>
+
+#include "audiooutputengine.h"
+
+class AlsaOutputEngine
+	: public AudioOutputEngine {
+	public:
+		AlsaOutputEngine();
+		~AlsaOutputEngine();
+		
+		// based on AudioOutputEngine
+		bool init(Channels chan) override;
+		void setParm(std::string parm, std::string value) override;
+		bool start() override;
+		void stop() override;
+		void pre(size_t nsamples) override;
+		void run(int ch, sample_t* samples, size_t nsamples) override;
+		void post(size_t nsamples) override;
+		size_t samplerate() override;
+		
+	private:
+		snd_pcm_t* handle;
+		snd_pcm_hw_params_t* params;
+		std::vector<sample_t> data;
+		size_t num_channels;
+		
+		std::string dev;
+		unsigned int srate; // samplerate
+		snd_pcm_uframes_t frames;
+};