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AUD_SndFileReader.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_SNDFILEREADER
#define AUD_SNDFILEREADER

#include "AUD_IReader.h"
#include "AUD_Reference.h"
class AUD_Buffer;

#include <sndfile.h>

typedef sf_count_t (*sf_read_f)(SNDFILE *sndfile, void *ptr, sf_count_t frames);

/**
 * This class reads a sound file via libsndfile.
 */
00040 class AUD_SndFileReader : public AUD_IReader
{
private:
      /**
       * The current position in samples.
       */
00046       int m_position;

      /**
       * The sample count in the file.
       */
00051       int m_length;

      /**
       * Whether the file is seekable.
       */
00056       bool m_seekable;

      /**
       * The specification of the audio data.
       */
00061       AUD_Specs m_specs;

      /**
       * The playback buffer.
       */
00066       AUD_Buffer* m_buffer;

      /**
       * The sndfile.
       */
00071       SNDFILE* m_sndfile;

      /**
       * The reading function.
       */
00076       sf_read_f m_read;

      /**
       * The virtual IO structure for memory file reading.
       */
00081       SF_VIRTUAL_IO m_vio;

      /**
       * The pointer to the memory file.
       */
00086       AUD_Reference<AUD_Buffer> m_membuffer;

      /**
       * The current reading pointer of the memory file.
       */
00091       int m_memoffset;

      // Functions for libsndfile virtual IO functionality
      static sf_count_t vio_get_filelen(void *user_data);
      static sf_count_t vio_seek(sf_count_t offset, int whence, void *user_data);
      static sf_count_t vio_read(void *ptr, sf_count_t count, void *user_data);
      static sf_count_t vio_tell(void *user_data);

public:
      /**
       * Creates a new reader.
       * \param filename The path to the file to be read.
       * \exception AUD_Exception Thrown if the file specified does not exist or
       *            cannot be read with libsndfile.
       */
      AUD_SndFileReader(const char* filename);

      /**
       * Creates a new reader.
       * \param buffer The buffer to read from.
       * \exception AUD_Exception Thrown if the buffer specified cannot be read
       *                          with libsndfile.
       */
      AUD_SndFileReader(AUD_Reference<AUD_Buffer> buffer);

      /**
       * Destroys the reader and closes the file.
       */
      virtual ~AUD_SndFileReader();

      virtual bool isSeekable();
      virtual void seek(int position);
      virtual int getLength();
      virtual int getPosition();
      virtual AUD_Specs getSpecs();
      virtual AUD_ReaderType getType();
      virtual bool notify(AUD_Message &message);
      virtual void read(int & length, sample_t* & buffer);
};

#endif //AUD_SNDFILEREADER

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