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37c4da81b5
This version lets the user select the ALSA device to use with a combo box. It does not check whether the device works for the parameters that LMMS uses (SND_PCM_ACCESS_RW_INTERLEAVED, SND_PCM_FORMAT_S16_LE, etc.). Doing these checks while compiling the list of available devices led to strange effects which are likely caused by the fact that the PCM device has to be opened to query its capabilities. This in turn led to error messages a la "Resource or device busy" when testing the new functionality repeatedly. However, having a combo box to select devices from should be a good step forward compared to a simple line edit. :)
107 lines
2.5 KiB
C++
107 lines
2.5 KiB
C++
/*
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* AudioAlsa.h - device-class that implements ALSA-PCM-output
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*
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* Copyright (c) 2004-2009 Tobias Doerffel <tobydox/at/users.sourceforge.net>
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*
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* This file is part of LMMS - http://lmms.io
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program (see COPYING); if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*
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*/
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#ifndef AUDIO_ALSA_H
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#define AUDIO_ALSA_H
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#include "lmmsconfig.h"
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#ifdef LMMS_HAVE_ALSA
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// older ALSA-versions might require this
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#define ALSA_PCM_NEW_HW_PARAMS_API
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#include <alsa/asoundlib.h>
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#include "AudioDevice.h"
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class AudioAlsa : public AudioDevice, public QThread
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{
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// Public classes and enums
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public:
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/**
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* @brief Contains the relevant information about available ALSA devices
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*/
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class DeviceInfo
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{
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public:
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DeviceInfo(QString const & deviceName, QString const & deviceDescription) :
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m_deviceName(deviceName),
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m_deviceDescription(deviceDescription)
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{}
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~DeviceInfo() {}
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QString const & getDeviceName() const { return m_deviceName; }
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QString const & getDeviceDescription() const { return m_deviceDescription; }
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private:
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QString m_deviceName;
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QString m_deviceDescription;
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};
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typedef std::vector<DeviceInfo> DeviceInfoCollection;
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public:
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AudioAlsa( bool & _success_ful, Mixer* mixer );
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virtual ~AudioAlsa();
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inline static QString name()
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{
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return QT_TRANSLATE_NOOP( "setupWidget",
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"ALSA (Advanced Linux Sound Architecture)" );
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}
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static QString probeDevice();
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static DeviceInfoCollection getAvailableDevices();
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private:
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virtual void startProcessing();
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virtual void stopProcessing();
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virtual void applyQualitySettings();
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virtual void run();
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int setHWParams( const ch_cnt_t _channels, snd_pcm_access_t _access );
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int setSWParams();
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int handleError( int _err );
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snd_pcm_t * m_handle;
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snd_pcm_uframes_t m_bufferSize;
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snd_pcm_uframes_t m_periodSize;
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snd_pcm_hw_params_t * m_hwParams;
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snd_pcm_sw_params_t * m_swParams;
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bool m_convertEndian;
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} ;
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#endif
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#endif
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