AudioRecorder.h

/*
 * MIT License
 *
 * Copyright (c) 2019-2023 Christof Ruch
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#pragma once

#include <juce_audio_devices/juce_audio_devices.h>
#include <juce_audio_formats/juce_audio_formats.h>

enum class RecordingType {
    WAV,
    FLAC,
    AIFF
};


class AudioRecorder : public juce::AudioIODeviceCallback {
public:
    AudioRecorder(juce::File directory, std::string const& baseFileName, RecordingType recordingType);
    virtual ~AudioRecorder() override;

    void startRecording(std::string const& filename, bool fromSilenceToSilence, std::function<void()> onSilence);
    void stopRecording();
    bool isRecording() const;
    bool hasDetectedSignal() const;

    juce::RelativeTime getElapsedTime() const;
    juce::String getFilename() const;
    juce::File getFile() const;

    void updateChannelInfo(int sampleRate, int numChannels);

    juce::File getDirectory() const;
    void setDirectory(juce::File& directory);

#if JUCE_VERSION < 0x070000
    virtual void audioDeviceIOCallback(const float** inputChannelData, int numInputChannels, float** outputChannelData, int numOutputChannels, int numSamples) override;
#else
    virtual void audioDeviceIOCallbackWithContext(const float* const* inputChannelData, int numInputChannels, float* const* outputChannelData, int numOutputChannels, int numSamples,
        const juce::AudioIODeviceCallbackContext& context) override;
#endif
    virtual void audioDeviceAboutToStart(juce::AudioIODevice* device) override;
    virtual void audioDeviceStopped() override;

private:
    void saveBlock(const float* const* data, int numSamples);

    juce::Time startTime_;
    juce::uint64 samplesWritten_;
    juce::File activeFile_;
    juce::File directory_;
    std::string baseFileName_;
    RecordingType recordingType_;
    juce::AudioFormatWriter* writer_;
    std::unique_ptr<juce::TimeSliceThread> thread_;
    std::unique_ptr<juce::AudioFormatWriter::ThreadedWriter> writeThread_;

    int lastSampleRate_;
    int lastNumChannels_;

    bool hasFoundStart_;
    bool automaticRecordFromSilenceToSilence_;
    size_t silenceDuration_;
    std::function<void()> onSilence_;
};