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AUD_JackDevice.h

/*
 * $Id$
 *
 * ***** BEGIN LGPL LICENSE BLOCK *****
 *
 * Copyright 2009 Jörg Hermann Müller
 *
 * This file is part of AudaSpace.
 *
 * AudaSpace 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.
 *
 * AudaSpace 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 AudaSpace.  If not, see <http://www.gnu.org/licenses/>.
 *
 * ***** END LGPL LICENSE BLOCK *****
 */

#ifndef AUD_JACKDEVICE
#define AUD_JACKDEVICE


#include "AUD_SoftwareDevice.h"
class AUD_Buffer;

#include <jack.h>

/**
 * This device plays back through Jack.
 */
00038 class AUD_JackDevice : public AUD_SoftwareDevice
{
private:
      /**
       * The output ports of jack.
       */
00044       jack_port_t** m_ports;

      /**
       * The jack client.
       */
00049       jack_client_t* m_client;

      /**
       * The output buffer.
       */
00054       AUD_Buffer* m_buffer;

      /**
       * Whether the device is valid.
       */
00059       bool m_valid;

      /**
       * Invalidates the jack device.
       * \param data The jack device that gets invalidet by jack.
       */
      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.
       */
      static int jack_mix(jack_nframes_t length, void *data);

protected:
      virtual void playing(bool playing);

public:
      /**
       * Creates a Jack client for audio output.
       * \param specs The wanted audio specification, where only the channel count is important.
       * \exception AUD_Exception Thrown if the audio device cannot be opened.
       */
      AUD_JackDevice(AUD_Specs specs);

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

#endif //AUD_JACKDEVICE

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