85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
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#include "config.h"
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#include <stdlib.h>
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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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extern inline ALuint64 GetDeviceClockTime(ALCdevice *device);
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extern inline void ALCdevice_Lock(ALCdevice *device);
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extern inline void ALCdevice_Unlock(ALCdevice *device);
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extern inline ClockLatency GetClockLatency(ALCdevice *device);
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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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int ret = almtx_init(&self->mMutex, almtx_recursive);
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assert(ret == althrd_success);
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self->mDevice = device;
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}
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void ALCbackend_Destruct(ALCbackend *self)
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{
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almtx_destroy(&self->mMutex);
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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=ATOMIC_LOAD(&device->MixCount, almemory_order_acquire))&1))
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althrd_yield();
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ret.ClockTime = GetDeviceClockTime(device);
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ATOMIC_THREAD_FENCE(almemory_order_acquire);
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} while(refcount != ATOMIC_LOAD(&device->MixCount, almemory_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 = device->UpdateSize * DEVICE_CLOCK_RES / device->Frequency *
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maxu(device->NumUpdates-1, 1);
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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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int ret = almtx_lock(&self->mMutex);
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assert(ret == althrd_success);
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}
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void ALCbackend_unlock(ALCbackend *self)
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{
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int ret = almtx_unlock(&self->mMutex);
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assert(ret == althrd_success);
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}
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/* Base ALCbackendFactory method implementations. */
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void ALCbackendFactory_deinit(ALCbackendFactory* UNUSED(self))
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{
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}
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