107 lines
2.7 KiB
C++
107 lines
2.7 KiB
C++
/*
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* Copyright (C) 2017 Robin Gareus <robin@gareus.org>
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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
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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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef __libbackend_alsa_slave_h__
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#define __libbackend_alsa_slave_h__
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#include <pthread.h>
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#include "pbd/ringbuffer.h"
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#include "pbd/g_atomic_compat.h"
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#include "zita-resampler/vresampler.h"
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#include "zita-alsa-pcmi.h"
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namespace ARDOUR {
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class AlsaAudioSlave
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{
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public:
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AlsaAudioSlave (
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const char *play_name,
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const char *capt_name,
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unsigned int master_rate,
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unsigned int master_samples_per_period,
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unsigned int slave_rate,
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unsigned int slave_samples_per_period,
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unsigned int periods_per_cycle);
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virtual ~AlsaAudioSlave ();
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bool start ();
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void stop ();
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void cycle_start (double, double, bool);
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void cycle_end ();
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uint32_t capt_chan (uint32_t chn, float* dst, uint32_t n_samples);
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uint32_t play_chan (uint32_t chn, float* src, uint32_t n_samples);
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bool running () const { return _active; }
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void freewheel (bool);
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int state (void) const { return _pcmi.state (); }
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uint32_t nplay (void) const { return _pcmi.nplay (); }
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uint32_t ncapt (void) const { return _pcmi.ncapt (); }
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PBD::Signal0<void> Halted;
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protected:
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virtual void update_latencies (uint32_t, uint32_t) = 0;
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private:
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Alsa_pcmi _pcmi;
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static void* _process_thread (void *);
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void* process_thread ();
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pthread_t _thread;
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bool _run; /* keep going or stop, ardour thread */
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bool _active; /* is running, process thread */
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/* DLL, track slave process callback */
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double _t0, _t1;
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uint64_t _samples_since_dll_reset;
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double _ratio;
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uint32_t _capt_latency;
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double _play_latency;
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volatile double _slave_speed;
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GATOMIC_QUAL gint _draining;
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PBD::RingBuffer<float> _rb_capture;
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PBD::RingBuffer<float> _rb_playback;
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size_t _samples_per_period; // master
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float* _capt_buff;
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float* _play_buff;
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float* _src_buff;
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ArdourZita::VResampler _src_capt;
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ArdourZita::VResampler _src_play;
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static void reset_resampler (ArdourZita::VResampler&);
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}; // class AlsaAudioSlave
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} // namespace
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#endif /* __libbackend_alsa_slave_h__ */
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