AudioResampler.h

/*******************************************************************************
 * Copyright (c) 2024, 2026, Olivier Ayache.  All rights reserved.
 *
 * This file is part of AVPKit.
 *
 * AVPKit 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.
 *
 * AVPKit 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 AVPKit.  If not, see <http://www.gnu.org/licenses/>.
 *******************************************************************************/
 
#ifndef AUDIORESAMPLER_H_
#define AUDIORESAMPLER_H_
 
#include <com/avpkit/core/IAudioResampler.h>
#include <com/avpkit/core/FfmpegIncludes.h>
 
namespace com { namespace avpkit { namespace core
  {
 
  class AudioResampler : public IAudioResampler
  {
  private:
    VS_JNIUTILS_REFCOUNTED_OBJECT_PRIVATE_MAKE(AudioResampler);
  public:
 
    // IAudioResampler
    virtual int getOutputChannels();
    virtual int getOutputRate();
    virtual int getInputChannels();
    virtual int getInputRate();
    virtual int resample(IAudioSamples *pOutputSamples, IAudioSamples *pInputSamples,
        int32_t numSamples);
 
    virtual IAudioSamples::Format getOutputFormat();
    virtual IAudioSamples::Format getInputFormat();
    virtual int32_t getFilterLen();
    virtual int32_t getLog2PhaseCount();
    virtual bool isLinear();
    virtual double getCutoffFrequency();
    
    // Not for calling from Java
    static AudioResampler* make(int32_t outputChannels, int32_t inputChannels,
        int32_t outputRate, int32_t inputRate);
 
    static AudioResampler* make(int32_t outputChannels, int32_t inputChannels,
        int32_t outputRate, int32_t inputRate,
        IAudioSamples::Format outputFmt, IAudioSamples::Format inputFmt);
 
    static AudioResampler* make(int32_t outputChannels, int32_t inputChannels,
        int32_t outputRate, int32_t inputRate,
        IAudioSamples::Format outputFmt, IAudioSamples::Format inputFmt,
        int32_t filterLen, int32_t log2PhaseCount,
        bool isLinear, double cutoff);
        
    virtual int32_t getMinimumNumSamplesRequiredInOutputSamples(
        IAudioSamples* inSamples);
    virtual int32_t getMinimumNumSamplesRequiredInOutputSamples(
        int32_t numSamples);
 
  protected:
    AudioResampler();
    virtual ~AudioResampler();
  private:
    SwrContext *swrContext;//Not used for the moment will replace mContext and deprecated resampler
    int32_t mOChannels;
    int32_t mOSampleRate;
    int32_t mIChannels;
    int32_t mISampleRate;
    IAudioSamples::Format mOFmt;
    IAudioSamples::Format mIFmt;
    int32_t mFilterLen;
    int32_t mLog2PhaseCount;
    bool mIsLinear;
    double mCutoff ;
    int64_t mNextPts;
    int64_t mPtsOffset;
  };
 
  }}}
 
#endif /*AUDIORESAMPLER_H_*/