Differential D1358 Diff 4476 extern/audaspace/plugins/jack/JackDevice.h

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extern/audaspace/plugins/jack/JackDevice.h

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				/*******************************************************************************
				* Copyright 2009-2015 Jörg Müller
				*
				* Licensed under the Apache License, Version 2.0 (the "License");
				* you may not use this file except in compliance with the License.
				* You may obtain a copy of the License at
				*
				* http://www.apache.org/licenses/LICENSE-2.0
				*
				* Unless required by applicable law or agreed to in writing, software
				* distributed under the License is distributed on an "AS IS" BASIS,
				* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
				* See the License for the specific language governing permissions and
				* limitations under the License.
				******************************************************************************/

				#pragma once

				#ifdef JACK_PLUGIN
				#define AUD_BUILD_PLUGIN
				#endif

				/**
				* @file JackDevice.h
				* @ingroup plugin
				* The JackDevice class.
				*/

				#include "JackSynchronizer.h"
				#include "devices/SoftwareDevice.h"
				#include "util/Buffer.h"

				#include <string>
				#include <condition_variable>
				#include <thread>
				#include <jack/jack.h>
				#include <jack/ringbuffer.h>

				AUD_NAMESPACE_BEGIN

				/**
				* This device plays back through Jack.
				*/
				class AUD_PLUGIN_API JackDevice : public SoftwareDevice
				{
				private:
				/**
				* The output ports of jack.
				*/
				jack_port_t** m_ports;

				/**
				* The jack client.
				*/
				jack_client_t* m_client;

				/**
				* The output buffer.
				*/
				Buffer m_buffer;

				/**
				* The deinterleaving buffer.
				*/
				Buffer m_deinterleavebuf;

				jack_ringbuffer_t** m_ringbuffers;

				/**
				* Whether the device is valid.
				*/
				bool m_valid;

				/// Synchronizer.
				JackSynchronizer m_synchronizer;

				/**
				* Invalidates the jack device.
				* \param data The jack device that gets invalidet by jack.
				*/
				AUD_LOCAL static void jack_shutdown(void* data);

				/**
				* Mixes the next bytes into the buffer.
				* \param length The length in samples to be filled.
				* \param data A pointer to the jack device.
				* \return 0 what shows success.
				*/
				AUD_LOCAL static int jack_mix(jack_nframes_t length, void* data);

				AUD_LOCAL static int jack_sync(jack_transport_state_t state, jack_position_t* pos, void* data);

				/**
				* Next Jack Transport state (-1 if not expected to change).
				*/
				jack_transport_state_t m_nextState;

				/**
				* Current jack transport status.
				*/
				jack_transport_state_t m_state;

				/**
				* Syncronisation state.
				*/
				int m_sync;

				/**
				* External syncronisation callback function.
				*/
				ISynchronizer::syncFunction m_syncFunc;

				/**
				* Data for the sync function.
				*/
				void* m_syncFuncData;

				/**
				* The mixing thread.
				*/
				std::thread m_mixingThread;

				/**
				* Mutex for mixing.
				*/
				std::mutex m_mixingLock;

				/**
				* Condition for mixing.
				*/
				std::condition_variable m_mixingCondition;

				/**
				* Updates the ring buffers.
				*/
				AUD_LOCAL void updateRingBuffers();

				// delete copy constructor and operator=
				JackDevice(const JackDevice&) = delete;
				JackDevice& operator=(const JackDevice&) = delete;

				protected:
				virtual void playing(bool playing);

				public:
				/**
				* Creates a Jack client for audio output.
				* \param name The client name.
				* \param specs The wanted audio specification, where only the channel count
				* is important.
				* \param buffersize The size of the internal buffer.
				* \exception Exception Thrown if the audio device cannot be opened.
				*/
				JackDevice(std::string name, DeviceSpecs specs, int buffersize = AUD_DEFAULT_BUFFER_SIZE);

				/**
				* Closes the Jack client.
				*/
				virtual ~JackDevice();

				virtual ISynchronizer* getSynchronizer();

				/**
				* Starts jack transport playback.
				*/
				void startPlayback();

				/**
				* Stops jack transport playback.
				*/
				void stopPlayback();

				/**
				* Seeks jack transport playback.
				* \param time The time to seek to.
				*/
				void seekPlayback(float time);

				/**
				* Sets the sync callback for jack transport playback.
				* \param sync The callback function.
				* \param data The data for the function.
				*/
				void setSyncCallback(ISynchronizer::syncFunction sync, void* data);

				/**
				* Retrieves the jack transport playback time.
				* \return The current time position.
				*/
				float getPlaybackPosition();

				/**
				* Returns whether jack transport plays back.
				* \return Whether jack transport plays back.
				*/
				bool doesPlayback();

				/**
				* Registers this plugin.
				*/
				static void registerPlugin();
				};

				AUD_NAMESPACE_END