ODDecodeFlacTask.h

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/**********************************************************************
 
  Audacity: A Digital Audio Editor
 
  ODDecodeFlacTask.h
 
  Created by Michael Chinen (mchinen) on 8/11/08.
  Audacity(R) is copyright (c) 1999-2008 Audacity Team.
  License: GPL v2.  See License.txt.
 
******************************************************************//*******************************************************************/
 
 
 
 
#ifndef __AUDACITY_ODDecodeFLACTask__
#define __AUDACITY_ODDecodeFLACTask__
 
#include <vector>
#include <wx/ffile.h> // data member
#include "ODDecodeTask.h"
 
#include "FLAC++/decoder.h"
 
class wxArrayString;
class ODDecodeBlockFile;
class WaveTrack;
class ODFileDecoder;
 
class ODFlacDecoder;
class ODFLACFile;
 
class ODDecodeFlacTask final : public ODDecodeTask
{
 public:
 
   ODDecodeFlacTask(){}
   virtual ~ODDecodeFlacTask();
 
 
   std::unique_ptr<ODTask> Clone() const override;
   ODFileDecoder* CreateFileDecoder(const wxString & fileName) override;
 
   unsigned int GetODType() override { return eODFLAC; }
};
 
 
class ODFLACFile final : public FLAC::Decoder::File
{
 public:
   ODFLACFile(ODFlacDecoder *decoder) : mDecoder(decoder)
   {
      mWasError = false;
      set_metadata_ignore_all();
      set_metadata_respond(FLAC__METADATA_TYPE_VORBIS_COMMENT);
      set_metadata_respond(FLAC__METADATA_TYPE_STREAMINFO);
   }
 
   bool get_was_error() const
   {
      return mWasError;
   }
 private:
   friend class ODFlacDecoder;
   ODFlacDecoder *mDecoder;
   bool                  mWasError;
   wxArrayString         mComments;
 
 protected:
   FLAC__StreamDecoderWriteStatus write_callback(const FLAC__Frame *frame,
                                                         const FLAC__int32 * const buffer[]) override;
   void metadata_callback(const FLAC__StreamMetadata *metadata) override;
   void error_callback(FLAC__StreamDecoderErrorStatus status) override;
};
 
#include "../blockfile/ODDecodeBlockFile.h" // to inherit
 
class ODFlacDecoder final : public ODFileDecoder
{
   friend class ODFLACFile;
public:
   ODFlacDecoder(const wxString & fileName):ODFileDecoder(fileName),mSamplesDone(0){mFile=NULL;}
   virtual ~ODFlacDecoder();
 
   int Decode(SampleBuffer & data, sampleFormat & format, sampleCount start, size_t len, unsigned int channel) override;
 
 
   bool ReadHeader() override;
 
   ODFLACFile* GetFlacFile();
 
private:
   friend class FLACImportFileHandle;
   sampleFormat          mFormat;
   std::unique_ptr<ODFLACFile> mFile;
   ODLock         mFlacFileLock;//for mFile;
   wxFFile               mHandle;
   unsigned long         mSampleRate;
   unsigned long         mNumChannels;
   unsigned long         mBitsPerSample;
   FLAC__uint64          mNumSamples;
   FLAC__uint64          mSamplesDone;
   sampleCount          mLastDecodeStartSample;
   bool                  mStreamInfoDone;
   int                   mUpdateResult;
   WaveTrack           **mChannels;
   unsigned int          mTargetChannel;
   unsigned int         mDecodeBufferWritePosition;
   unsigned int         mDecodeBufferLen;
   samplePtr            mDecodeBuffer;
};
 
#endif