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#ifndef ALC_BACKENDS_BASE_H
#define ALC_BACKENDS_BASE_H
#include <chrono>
#include <memory>
#include <mutex>
#include <string>
#include "AL/alc.h"
#include "alcmain.h"
#include "albyte.h"
struct ClockLatency {
std::chrono::nanoseconds ClockTime;
std::chrono::nanoseconds Latency;
};
struct BackendBase {
virtual void open(const ALCchar *name) = 0;
virtual bool reset();
virtual bool start() = 0;
virtual void stop() = 0;
virtual ALCenum captureSamples(al::byte *buffer, ALCuint samples);
virtual ALCuint availableSamples();
virtual ClockLatency getClockLatency();
ALCdevice *const mDevice;
BackendBase(ALCdevice *device) noexcept : mDevice{device} { }
virtual ~BackendBase() = default;
};
using BackendPtr = std::unique_ptr<BackendBase>;
enum class BackendType {
Playback,
Capture
};
/* Helper to get the current clock time from the device's ClockBase, and
* SamplesDone converted from the sample rate.
*/
inline std::chrono::nanoseconds GetDeviceClockTime(ALCdevice *device)
{
using std::chrono::seconds;
using std::chrono::nanoseconds;
auto ns = nanoseconds{seconds{device->SamplesDone}} / device->Frequency;
return device->ClockBase + ns;
}
/* Helper to get the device latency from the backend, including any fixed
* latency from post-processing.
*/
inline ClockLatency GetClockLatency(ALCdevice *device)
{
BackendBase *backend{device->Backend.get()};
ClockLatency ret{backend->getClockLatency()};
ret.Latency += device->FixedLatency;
return ret;
}
struct BackendFactory {
virtual bool init() = 0;
virtual bool querySupport(BackendType type) = 0;
virtual std::string probe(BackendType type) = 0;
virtual BackendPtr createBackend(ALCdevice *device, BackendType type) = 0;
protected:
virtual ~BackendFactory() = default;
};
#endif /* ALC_BACKENDS_BASE_H */
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