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/* -*- 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 Lesser General Public License as published by
* the Free Software Foundation; either version 3 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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(const Channels& chan) override;
void setParm(const std::string& parm, const 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;
};
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