mirror of
https://github.com/gnif/LookingGlass.git
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7c24b585af
Add a WaveRT adapter with render and capture endpoints backed by a local ring buffer and shared presentation clock. Advertise PCM formats through 192 kHz, eight channels, and packed 24-bit samples. Register LGAudio in the IDD solution and package it as Looking Glass Audio.
58 lines
1.6 KiB
C++
58 lines
1.6 KiB
C++
/**
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* Looking Glass
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* Copyright © 2017-2026 The Looking Glass Authors
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* https://looking-glass.io
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc., 59
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* Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "AudioClock.h"
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namespace LGAudio
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{
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CAudioClock::CAudioClock() :
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m_frequency(0)
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{
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}
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_IRQL_requires_max_(PASSIVE_LEVEL)
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NTSTATUS CAudioClock::Initialize()
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{
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LARGE_INTEGER frequency{};
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KeQueryPerformanceCounter(&frequency);
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if (frequency.QuadPart <= 0)
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return STATUS_DEVICE_HARDWARE_ERROR;
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m_frequency = static_cast<ULONGLONG>(frequency.QuadPart);
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return STATUS_SUCCESS;
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}
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_IRQL_requires_max_(DISPATCH_LEVEL)
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AudioClockSnapshot CAudioClock::GetSnapshot() const
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{
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const LARGE_INTEGER qpc = KeQueryPerformanceCounter(nullptr);
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const ULONGLONG position = static_cast<ULONGLONG>(qpc.QuadPart);
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// The fallback domains are identical, making the correlation exact.
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return
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{
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position,
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m_frequency,
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position,
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m_frequency
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};
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}
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}
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