95 lines
2.0 KiB
C++
95 lines
2.0 KiB
C++
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#include "config.h"
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#include <stdlib.h>
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#include <thread>
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#include "alMain.h"
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#include "alu.h"
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#include "backends/base.h"
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void ALCdevice_Lock(ALCdevice *device)
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{ V0(device->Backend,lock)(); }
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void ALCdevice_Unlock(ALCdevice *device)
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{ V0(device->Backend,unlock)(); }
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ClockLatency GetClockLatency(ALCdevice *device)
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{
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ClockLatency ret = V0(device->Backend,getClockLatency)();
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ret.Latency += device->FixedLatency;
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return ret;
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}
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/* Base ALCbackend method implementations. */
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void ALCbackend_Construct(ALCbackend *self, ALCdevice *device)
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{
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self->mDevice = device;
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}
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void ALCbackend_Destruct(ALCbackend* UNUSED(self))
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{
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}
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ALCboolean ALCbackend_reset(ALCbackend* UNUSED(self))
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{
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return ALC_FALSE;
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}
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ALCenum ALCbackend_captureSamples(ALCbackend* UNUSED(self), void* UNUSED(buffer), ALCuint UNUSED(samples))
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{
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return ALC_INVALID_DEVICE;
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}
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ALCuint ALCbackend_availableSamples(ALCbackend* UNUSED(self))
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{
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return 0;
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}
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ClockLatency ALCbackend_getClockLatency(ALCbackend *self)
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{
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ALCdevice *device = self->mDevice;
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ALuint refcount;
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ClockLatency ret;
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do {
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while(((refcount=device->MixCount.load(std::memory_order_acquire))&1))
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std::this_thread::yield();
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ret.ClockTime = GetDeviceClockTime(device);
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std::atomic_thread_fence(std::memory_order_acquire);
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} while(refcount != device->MixCount.load(std::memory_order_relaxed));
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/* NOTE: The device will generally have about all but one periods filled at
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* any given time during playback. Without a more accurate measurement from
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* the output, this is an okay approximation.
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*/
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ret.Latency = std::chrono::seconds{device->UpdateSize*maxi(device->NumUpdates-1, 0)};
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ret.Latency /= device->Frequency;
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return ret;
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}
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void ALCbackend_lock(ALCbackend *self)
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{
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try {
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self->mMutex.lock();
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}
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catch(...) {
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std::terminate();
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}
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}
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void ALCbackend_unlock(ALCbackend *self)
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{
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try {
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self->mMutex.unlock();
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}
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catch(...) {
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std::terminate();
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}
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}
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