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aflibAudio.h

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/*
 * Copyright: (C) 1999-2001 Bruce W. Forsberg
 *
 *   This library 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 2.1 of the License, or any later version.
 *
 *   This library 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 this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
 *
 *   Bruce Forsberg  forsberg@tns.net
 *
 */

#ifndef _AFLIBAUDIO_H
#define _AFLIBAUDIO_H

#include "aflib.h"
#include "aflibChain.h"
#include "aflibMemCache.h"
#include "aflibConfig.h"

#include <list>


class aflibData;
class aflibAudioSampleRateCvt;
class aflibAudioMixer;


class aflibAudio : public aflibChain, public aflibMemCache {

public:

   virtual
   ~aflibAudio();

   void
   enable(bool enable);

   bool
   getEnable() const;

   void
   enableDataSizeConversion(bool enable);

   void
   enableEndianConversion(bool enable);

   void
   enableSampleRateConversion(bool enable);

   void
   enableChannelsConversion(bool enable);

   virtual void
   setInputConfig(const aflibConfig& cfg);

   virtual const aflibConfig&
   getInputConfig() const;

   virtual void
   setOutputConfig(const aflibConfig& cfg);

   virtual const aflibConfig&
   getOutputConfig() const;

   virtual const char *
   getName() const = 0 ;

   virtual aflibStatus
   compute_segment(
      list<aflibData *>& data,
      long long position = -1) = 0;

   virtual aflibData *
   process(
      aflibStatus& ret_status,
      long long position,
      int& num_samples,
      bool free_memory = TRUE);

protected:

   aflibAudio();
   aflibAudio(aflibAudio& audio);

   void
   convertSampleRate(aflibAudio&  parent);

   void
   convertChannels(aflibAudio&  parent);

   void
   convertData(aflibData& data);

   void
   examineChain();

   bool
   checkChain(const aflibAudio * audio) const;

   void
   preprocessChain(
      aflibAudio * audio,
      aflibAudio * child);

   // "is" functions that indicate what formats an object supports
   virtual bool
   isDataSizeSupported(aflib_data_size size);

   virtual bool
   isEndianSupported(aflib_data_endian end);

   virtual bool
   isSampleRateSupported(int& rate);

   virtual bool
   isChannelsSupported(int& channels);

   inline void
   incrementLevel() {_level++;};

   inline void
   decrementLevel() {_level--;};

private:

bool     _enable;
bool     _enable_data_size;
bool     _enable_endian;
bool     _enable_sample_rate;
bool     _enable_channels;
aflibConfig _cfg_input;
aflibConfig _cfg_output;
aflibAudioSampleRateCvt  * _cvt;
aflibAudioMixer  * _mix;
static int  _level;

};


#endif

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