liveMedia/include/uLawAudioFilter.hh

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/**********
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 (at your
option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)

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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
**********/
// "liveMedia"
// Copyright (c) 1996-2012 Live Networks, Inc.  All rights reserved.
// Filters for converting between raw PCM audio and uLaw
// C++ header

#ifndef _ULAW_AUDIO_FILTER_HH
#define _ULAW_AUDIO_FILTER_HH

#ifndef _FRAMED_FILTER_HH
#include "FramedFilter.hh"
#endif


class uLawFromPCMAudioSource: public FramedFilter {
public:
  static uLawFromPCMAudioSource*
  createNew(UsageEnvironment& env, FramedSource* inputSource,
            int byteOrdering = 0);
  // "byteOrdering" == 0 => host order (the default)
  // "byteOrdering" == 1 => little-endian order
  // "byteOrdering" == 2 => network (i.e., big-endian) order

protected:
  uLawFromPCMAudioSource(UsageEnvironment& env, FramedSource* inputSource,
                         int byteOrdering);
      // called only by createNew()
  virtual ~uLawFromPCMAudioSource();

private:
  // Redefined virtual functions:
  virtual void doGetNextFrame();

private:
  static void afterGettingFrame(void* clientData, unsigned frameSize,
                                unsigned numTruncatedBytes,
                                struct timeval presentationTime,
                                unsigned durationInMicroseconds);
  void afterGettingFrame1(unsigned frameSize,
                          unsigned numTruncatedBytes,
                          struct timeval presentationTime,
                          unsigned durationInMicroseconds);

private:
  int fByteOrdering;
  unsigned char* fInputBuffer;
  unsigned fInputBufferSize;
};



class PCMFromuLawAudioSource: public FramedFilter {
public:
  static PCMFromuLawAudioSource*
  createNew(UsageEnvironment& env, FramedSource* inputSource);

protected:
  PCMFromuLawAudioSource(UsageEnvironment& env,
                         FramedSource* inputSource);
      // called only by createNew()
  virtual ~PCMFromuLawAudioSource();

private:
  // Redefined virtual functions:
  virtual void doGetNextFrame();

private:
  static void afterGettingFrame(void* clientData, unsigned frameSize,
                                unsigned numTruncatedBytes,
                                struct timeval presentationTime,
                                unsigned durationInMicroseconds);
  void afterGettingFrame1(unsigned frameSize,
                          unsigned numTruncatedBytes,
                          struct timeval presentationTime,
                          unsigned durationInMicroseconds);

private:
  unsigned char* fInputBuffer;
  unsigned fInputBufferSize;
};



class NetworkFromHostOrder16: public FramedFilter {
public:
  static NetworkFromHostOrder16*
  createNew(UsageEnvironment& env, FramedSource* inputSource);

protected:
  NetworkFromHostOrder16(UsageEnvironment& env, FramedSource* inputSource);
      // called only by createNew()
  virtual ~NetworkFromHostOrder16();

private:
  // Redefined virtual functions:
  virtual void doGetNextFrame();

private:
  static void afterGettingFrame(void* clientData, unsigned frameSize,
                                unsigned numTruncatedBytes,
                                struct timeval presentationTime,
                                unsigned durationInMicroseconds);
  void afterGettingFrame1(unsigned frameSize,
                          unsigned numTruncatedBytes,
                          struct timeval presentationTime,
                          unsigned durationInMicroseconds);
};



class HostFromNetworkOrder16: public FramedFilter {
public:
  static HostFromNetworkOrder16*
  createNew(UsageEnvironment& env, FramedSource* inputSource);

protected:
  HostFromNetworkOrder16(UsageEnvironment& env, FramedSource* inputSource);
      // called only by createNew()
  virtual ~HostFromNetworkOrder16();

private:
  // Redefined virtual functions:
  virtual void doGetNextFrame();

private:
  static void afterGettingFrame(void* clientData, unsigned frameSize,
                                unsigned numTruncatedBytes,
                                struct timeval presentationTime,
                                unsigned durationInMicroseconds);
  void afterGettingFrame1(unsigned frameSize,
                          unsigned numTruncatedBytes,
                          struct timeval presentationTime,
                          unsigned durationInMicroseconds);
};



class EndianSwap16: public FramedFilter {
public:
  static EndianSwap16* createNew(UsageEnvironment& env, FramedSource* inputSource);

protected:
  EndianSwap16(UsageEnvironment& env, FramedSource* inputSource);
      // called only by createNew()
  virtual ~EndianSwap16();

private:
  // Redefined virtual functions:
  virtual void doGetNextFrame();

private:
  static void afterGettingFrame(void* clientData, unsigned frameSize,
                                unsigned numTruncatedBytes,
                                struct timeval presentationTime,
                                unsigned durationInMicroseconds);
  void afterGettingFrame1(unsigned frameSize,
                          unsigned numTruncatedBytes,
                          struct timeval presentationTime,
                          unsigned durationInMicroseconds);
};

#endif

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