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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;
};
/* 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;
}
ClockLatency GetClockLatency(ALCdevice *device);
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();
virtual void lock() { mMutex.lock(); }
virtual void unlock() { mMutex.unlock(); }
ALCdevice *mDevice;
std::recursive_mutex mMutex;
BackendBase(ALCdevice *device) noexcept;
virtual ~BackendBase();
};
using BackendPtr = std::unique_ptr<BackendBase>;
using BackendUniqueLock = std::unique_lock<BackendBase>;
using BackendLockGuard = std::lock_guard<BackendBase>;
enum class BackendType {
Playback,
Capture
};
enum class DevProbe {
Playback,
Capture
};
struct BackendFactory {
virtual bool init() = 0;
virtual bool querySupport(BackendType type) = 0;
virtual void probe(DevProbe type, std::string *outnames) = 0;
virtual BackendPtr createBackend(ALCdevice *device, BackendType type) = 0;
protected:
virtual ~BackendFactory() = default;
};
#endif /* ALC_BACKENDS_BASE_H */
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