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.
71 lines
2.1 KiB
C++
71 lines
2.1 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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#pragma once
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#include "Common.h"
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namespace LGAudio
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{
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/**
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* A correlated sample of the audio time domain and the Windows QPC time
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* domain. Position drives audio progress; QpcPosition timestamps that
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* position for WaveRT clients.
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*/
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struct AudioClockSnapshot
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{
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ULONGLONG Position;
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ULONGLONG Frequency;
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ULONGLONG QpcPosition;
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ULONGLONG QpcFrequency;
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};
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/**
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* Adapter-owned clock shared by all render and capture streams.
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*
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* The local fallback uses QPC for both domains. A transport-disciplined
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* implementation can later synthesize a continuous, monotonic Position
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* while preserving its correlation with the local QPC fields. Before a
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* non-unity clock rate is enabled, the stream deadline and timestamp
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* conversions must consume an explicit fixed-point affine mapping between
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* the two domains.
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*/
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class CAudioClock final
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{
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public:
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CAudioClock();
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CAudioClock(const CAudioClock &) = delete;
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CAudioClock & operator=(const CAudioClock &) = delete;
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_IRQL_requires_max_(PASSIVE_LEVEL)
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NTSTATUS Initialize();
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_IRQL_requires_max_(DISPATCH_LEVEL)
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AudioClockSnapshot GetSnapshot() const;
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private:
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ULONGLONG m_frequency;
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};
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}
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using LGAudio::AudioClockSnapshot;
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using LGAudio::CAudioClock;
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