39 lines
1.3 KiB
C++
39 lines
1.3 KiB
C++
#pragma once
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#include <cstddef>
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#include <memory>
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#include <string>
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extern "C" {
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#include <libavutil/frame.h>
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}
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namespace playback {
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// One decoding worker produces output. The native audio callback is the consumer.
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// Audio is interleaved stereo float at 48 kHz; write() never blocks.
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class Output {
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public:
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Output();
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~Output();
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Output(const Output &) = delete;
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Output &operator=(const Output &) = delete;
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bool configure_audio(std::string &error);
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bool start(std::string &error);
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void pause();
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// Atomic target gain; callback slews to it within 240 frames (5 ms).
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void set_volume(float normalized0to1) noexcept;
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float volume() const noexcept;
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// Called with audio stopped. Clears audio and video from the old timeline.
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void reset();
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std::size_t write(const float *samples, std::size_t frames, double pts);
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std::size_t queued() const;
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// Latency-aware presented position; NaN until an audio callback has run.
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double clock() const;
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// Retains the frame's buffers; decoder may reuse its AVFrame after return.
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void present(const AVFrame *frame);
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// Returns a retained NSView. The view remains safe after Output is destroyed.
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void *make_video_view();
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private:
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struct Impl;
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std::unique_ptr<Impl> impl;
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};
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}
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