143 lines
4.6 KiB
C++
143 lines
4.6 KiB
C++
//=============================================================================
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// MuseScore
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// Linux Music Score Editor
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// $Id: alsa.h 5660 2012-05-22 14:17:39Z wschweer $
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//
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// Copyright (C) 2002-2009 Werner Schweer and others
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//
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// AlsaDriver based on code from Fons Adriaensen (clalsadr.cc)
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// Copyright (C) 2003 Fons Adriaensen
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// partly based on original work from Paul Davis
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License version 2.
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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
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// GNU 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 License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//=============================================================================
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#ifndef __ALSA_H__
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#define __ALSA_H__
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#include <alsa/asoundlib.h>
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#include <poll.h>
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#include "config.h"
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#include "driver.h"
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#include "mididriver.h"
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typedef struct pollfd PollFd;
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#define ALSA_PCM_NEW_HW_PARAMS_API
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#define ALSA_PCM_NEW_SW_PARAMS_API
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namespace Ms {
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class MidiDriver;
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enum class Transport : char;
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//---------------------------------------------------------
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// AlsaDriver
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//---------------------------------------------------------
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class AlsaDriver {
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QString _name;
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typedef char* (*play_function)(const float*, char*, int, int);
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typedef char* (*clear_function)(char*, int, int);
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enum { MAXPFD = 8, MAXPLAY = 4 };
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int setHwpar(snd_pcm_t* handle, snd_pcm_hw_params_t* hwpar);
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int setSwpar(snd_pcm_t* handle, snd_pcm_sw_params_t* swpar);
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int recover();
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unsigned int _rate;
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snd_pcm_uframes_t _frsize;
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unsigned int _nfrags;
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snd_pcm_format_t _play_format;
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snd_pcm_access_t _play_access;
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snd_pcm_t* _play_handle;
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snd_pcm_hw_params_t* _play_hwpar;
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snd_pcm_sw_params_t* _play_swpar;
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unsigned int _play_nchan;
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int _play_npfd;
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PollFd _pfd [MAXPFD];
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snd_pcm_uframes_t _capt_offs;
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snd_pcm_uframes_t _play_offs;
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int _play_step;
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char* _play_ptr [MAXPLAY];
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int _stat;
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int _pcnt;
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bool _xrun;
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clear_function _clear_func;
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play_function _play_func;
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bool mmappedInterface;
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static char* clear_32le(char* dst, int step, int nfrm);
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static char* clear_24le(char* dst, int step, int nfrm);
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static char* clear_16le(char* dst, int step, int nfrm);
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static char* play_32le(const float* src, char* dst, int step, int nfrm);
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static char* play_24le(const float* src, char* dst, int step, int nfrm);
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static char* play_16le(const float* src, char* dst, int step, int nfrm);
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int playInit(snd_pcm_uframes_t len);
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snd_pcm_sframes_t pcmWait();
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snd_pcm_t* playHandle() const { return _play_handle; }
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void clearChan(int chan, snd_pcm_uframes_t len) {
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_play_ptr[chan] = _clear_func(_play_ptr[chan], _play_step, len);
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}
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public:
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AlsaDriver(QString, unsigned, snd_pcm_uframes_t, unsigned);
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~AlsaDriver();
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bool init();
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void printinfo();
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bool pcmStart();
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int pcmStop();
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snd_pcm_uframes_t fsize() const { return _frsize; }
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unsigned int sampleRate() const { return _rate; }
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void write(int n, float* l, float* r);
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};
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//---------------------------------------------------------
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// AlsaAudio
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//---------------------------------------------------------
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class AlsaAudio : public Driver {
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pthread_t thread;
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AlsaDriver* alsa;
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volatile int runAlsa;
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Transport state;
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bool seekflag;
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MidiDriver* midiDriver;
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void registerClient();
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public:
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AlsaAudio(Seq*);
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virtual ~AlsaAudio();
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virtual bool init(bool hot = false);
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virtual bool start();
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virtual bool stop();
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float* getLBuffer(long n);
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float* getRBuffer(long n);
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virtual bool isRealtime() const { return false; }
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virtual void startTransport();
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virtual void stopTransport();
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virtual Transport getState() override;
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virtual int sampleRate() const;
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void alsaLoop();
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void write(int n, void* l);
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virtual void midiRead();
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};
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}
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#endif
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