38 lines
921 B
C++
38 lines
921 B
C++
#pragma once
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#include <QThread>
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#include <QString>
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#include <atomic>
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#include <alsa/asoundlib.h>
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// Audio passthrough: captures from the grabber's ALSA device and plays it
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// straight to the default output with small buffers (low latency, so the
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// sound stays in sync with the video preview). Same implementation as in
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// the HDMI viewer.
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class AudioThread : public QThread
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{
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Q_OBJECT
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public:
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explicit AudioThread(const QString &device, QObject *parent = nullptr);
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~AudioThread() override;
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void stop();
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signals:
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void errorOccurred(const QString &message);
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protected:
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void run() override;
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private:
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QString m_device;
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std::atomic<bool> m_running{false};
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// PCM parameters
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static constexpr unsigned int k_defaultRate = 48000;
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static constexpr unsigned int k_defaultChannels = 2;
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static constexpr snd_pcm_uframes_t k_periodFrames = 1024;
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};
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