juce_AudioThumbnailBase.h

Go to the documentation of this file.

 /*
  ==============================================================================
 
   This file is part of the JUCE library.
   Copyright (c) 2022 - Raw Material Software Limited
 
   JUCE is an open source library subject to commercial or open-source
   licensing.
 
   By using JUCE, you agree to the terms of both the JUCE 7 End-User License
   Agreement and JUCE Privacy Policy.
 
   End User License Agreement: www.juce.com/juce-7-licence
   Privacy Policy: www.juce.com/juce-privacy-policy
 
   Or: You may also use this code under the terms of the GPL v3 (see
   www.gnu.org/licenses).
 
   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.
 
  ==============================================================================
*/
 
namespace juce
{
 
class AudioThumbnailCache;
 
//==============================================================================
class JUCE_API  AudioThumbnailBase    : public ChangeBroadcaster,
                                        public AudioFormatWriter::ThreadedWriter::IncomingDataReceiver
{
public:
    //==============================================================================
    AudioThumbnailBase() = default;
    ~AudioThumbnailBase() override = default;
 
    //==============================================================================
    virtual void clear() = 0;
 
    virtual bool setSource (InputSource* newSource) = 0;
 
    virtual void setReader (AudioFormatReader* newReader, int64 hashCode) = 0;
 
    //==============================================================================
    virtual bool loadFrom (InputStream& input) = 0;
 
    virtual void saveTo (OutputStream& output) const = 0;
 
    //==============================================================================
    virtual int getNumChannels() const noexcept = 0;
 
    virtual double getTotalLength() const noexcept = 0;
 
    virtual void drawChannel (Graphics& g,
                              const Rectangle<int>& area,
                              double startTimeSeconds,
                              double endTimeSeconds,
                              int channelNum,
                              float verticalZoomFactor) = 0;
 
    virtual void drawChannels (Graphics& g,
                               const Rectangle<int>& area,
                               double startTimeSeconds,
                               double endTimeSeconds,
                               float verticalZoomFactor) = 0;
 
    virtual bool isFullyLoaded() const noexcept = 0;
 
    virtual int64 getNumSamplesFinished() const noexcept = 0;
 
    virtual float getApproximatePeak() const = 0;
 
    virtual void getApproximateMinMax (double startTime, double endTime, int channelIndex,
                                       float& minValue, float& maxValue) const noexcept = 0;
 
    virtual int64 getHashCode() const = 0;
};
 
} // namespace juce