SDLSoundDriver.hh

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#ifndef SDLSOUNDDRIVER_HH
#define SDLSOUNDDRIVER_HH
 
#include "SoundDriver.hh"
 
#include "SDLSurfacePtr.hh"
 
#include "MemBuffer.hh"
 
#include <SDL.h>
 
namespace openmsx {
 
class Reactor;
 
class SDLSoundDriver final : public SoundDriver
{
public:
        SDLSoundDriver(Reactor& reactor, unsigned wantedFreq, unsigned samples);
        SDLSoundDriver(const SDLSoundDriver&) = delete;
        SDLSoundDriver(SDLSoundDriver&&) = delete;
        SDLSoundDriver& operator=(const SDLSoundDriver&) = delete;
        SDLSoundDriver& operator=(SDLSoundDriver&&) = delete;
        ~SDLSoundDriver() override;
 
        void mute() override;
        void unmute() override;
 
        [[nodiscard]] unsigned getFrequency() const override;
        [[nodiscard]] unsigned getSamples() const override;
 
        void uploadBuffer(std::span<const StereoFloat> buffer) override;
 
private:
        void reInit();
        [[nodiscard]] unsigned getBufferFilled() const;
        [[nodiscard]] unsigned getBufferFree() const;
        static void audioCallbackHelper(void* userdata, uint8_t* strm, int len);
        void audioCallback(std::span<StereoFloat> stream);
 
private:
        Reactor& reactor;
        SDL_AudioDeviceID deviceID;
        MemBuffer<StereoFloat> mixBuffer;
        unsigned mixBufferSize;
        unsigned frequency;
        unsigned fragmentSize;
        unsigned readIdx, writeIdx;
        bool muted = true;
        [[no_unique_address]] SDLSubSystemInitializer<SDL_INIT_AUDIO> audioInitializer;
};
 
} // namespace openmsx
 
#endif