mirror of
https://github.com/gnif/LookingGlass.git
synced 2026-11-12 14:57:20 +00:00
[idd] audio: add virtual playback and capture driver
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.
This commit is contained in:
Geoffrey McRae
253
idd/LGAudio/Adapter.cpp
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253
idd/LGAudio/Adapter.cpp
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/**
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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 "Adapter.h"
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#include "Formats.h"
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#include "MiniportTopology.h"
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#include "MiniportWaveRT.h"
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namespace
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{
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NTSTATUS InstallTopologySubdevice(
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_In_ PDEVICE_OBJECT deviceObject,
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_In_ PIRP irp,
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_In_ PRESOURCELIST resourceList,
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_In_ CAudioAdapter *adapter,
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_In_ EndpointKind kind,
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_In_ const wchar_t *name,
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_Outptr_ PUNKNOWN *portUnknown)
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{
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*portUnknown = nullptr;
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PPORT port = nullptr;
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NTSTATUS status = PcNewPort(&port, CLSID_PortTopology);
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if (!NT_SUCCESS(status))
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return status;
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CMiniportTopology *miniport = new(NonPagedPoolNx, LGAUDIO_POOL_TAG)
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CMiniportTopology(kind);
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if (!miniport)
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{
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port->Release();
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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status = port->Init(deviceObject, irp,
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static_cast<IMiniportTopology *>(miniport), adapter, resourceList);
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if (NT_SUCCESS(status))
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status = PcRegisterSubdevice(deviceObject,
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const_cast<PWSTR>(name), port);
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miniport->Release();
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if (!NT_SUCCESS(status))
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{
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port->Release();
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return status;
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}
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*portUnknown = port;
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return STATUS_SUCCESS;
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}
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NTSTATUS InstallWaveSubdevice(
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_In_ PDEVICE_OBJECT deviceObject,
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_In_ PIRP irp,
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_In_ PRESOURCELIST resourceList,
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_In_ CAudioAdapter *adapter,
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_In_ EndpointKind kind,
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_In_ const wchar_t *name,
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_Outptr_ PUNKNOWN *portUnknown)
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{
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*portUnknown = nullptr;
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PPORT port = nullptr;
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NTSTATUS status = PcNewPort(&port, CLSID_PortWaveRT);
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if (!NT_SUCCESS(status))
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return status;
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CMiniportWaveRT *miniport = new(NonPagedPoolNx, LGAUDIO_POOL_TAG)
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CMiniportWaveRT(adapter, kind);
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if (!miniport)
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{
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port->Release();
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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status = port->Init(deviceObject, irp,
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static_cast<IMiniportWaveRT *>(miniport), adapter, resourceList);
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if (NT_SUCCESS(status))
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status = PcRegisterSubdevice(deviceObject,
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const_cast<PWSTR>(name), port);
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miniport->Release();
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if (!NT_SUCCESS(status))
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{
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port->Release();
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return status;
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}
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*portUnknown = port;
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return STATUS_SUCCESS;
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}
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}
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CAudioAdapter::CAudioAdapter() :
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m_refCount(1)
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{
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}
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CAudioAdapter::~CAudioAdapter()
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{
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m_ring.Destroy();
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}
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NTSTATUS CAudioAdapter::Initialize()
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{
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NTSTATUS status = m_clock.Initialize();
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if (NT_SUCCESS(status))
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status = m_ring.Init();
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return status;
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}
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_IRQL_requires_max_(DISPATCH_LEVEL)
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NTSTATUS CAudioAdapter::ConfigureRender(
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_In_ const FormatFingerprint &format)
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{
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return m_ring.Configure(format);
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}
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_IRQL_requires_max_(DISPATCH_LEVEL)
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void CAudioAdapter::ResetCapture()
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{
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m_ring.Reset();
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}
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_IRQL_requires_max_(DISPATCH_LEVEL)
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void CAudioAdapter::WriteRenderFrames(
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_In_reads_bytes_(bytes) const BYTE *data,
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_In_ ULONG bytes)
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{
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m_ring.Push(data, bytes);
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}
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_IRQL_requires_max_(DISPATCH_LEVEL)
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void CAudioAdapter::ReadCaptureFrames(
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_In_ const FormatFingerprint &format,
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_Out_writes_bytes_(bytes) BYTE *data,
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_In_ ULONG bytes)
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{
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m_ring.Pop(format, data, bytes);
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}
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_IRQL_requires_max_(DISPATCH_LEVEL)
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void CAudioAdapter::DiscardCaptureFrames(
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_In_ const FormatFingerprint &format,
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_In_ ULONGLONG bytes)
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{
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m_ring.Discard(format, bytes);
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}
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_IRQL_requires_max_(DISPATCH_LEVEL)
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AudioClockSnapshot CAudioAdapter::GetClockSnapshot() const
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{
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return m_clock.GetSnapshot();
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}
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NTSTATUS CAudioAdapter::QueryInterface(
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_In_ REFIID interfaceId,
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_COM_Outptr_ void **object)
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{
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if (!object)
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return STATUS_INVALID_PARAMETER;
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*object = nullptr;
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if (!GuidEqual(interfaceId, IID_IUnknown))
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return STATUS_NOINTERFACE;
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*object = static_cast<IUnknown *>(this);
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AddRef();
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return STATUS_SUCCESS;
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}
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ULONG CAudioAdapter::AddRef()
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{
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return static_cast<ULONG>(InterlockedIncrement(&m_refCount));
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}
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ULONG CAudioAdapter::Release()
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{
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const LONG count = InterlockedDecrement(&m_refCount);
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if (!count)
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delete this;
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return static_cast<ULONG>(count);
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}
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NTSTATUS StartAudioDevice(
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_In_ PDEVICE_OBJECT deviceObject,
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_In_ PIRP irp,
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_In_ PRESOURCELIST resourceList)
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{
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PUNKNOWN topologyRender = nullptr;
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PUNKNOWN waveRender = nullptr;
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PUNKNOWN topologyCapture = nullptr;
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PUNKNOWN waveCapture = nullptr;
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CAudioAdapter *adapter = new(NonPagedPoolNx, LGAUDIO_POOL_TAG)
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CAudioAdapter();
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if (!adapter)
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return STATUS_INSUFFICIENT_RESOURCES;
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NTSTATUS status = adapter->Initialize();
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if (NT_SUCCESS(status))
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status = InstallTopologySubdevice(deviceObject, irp, resourceList,
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adapter, EndpointKind::Render, kTopologyRenderName, &topologyRender);
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if (NT_SUCCESS(status))
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status = InstallWaveSubdevice(deviceObject, irp, resourceList,
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adapter, EndpointKind::Render, kWaveRenderName, &waveRender);
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if (NT_SUCCESS(status))
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status = InstallTopologySubdevice(deviceObject, irp, resourceList,
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adapter, EndpointKind::Capture, kTopologyCaptureName,
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&topologyCapture);
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if (NT_SUCCESS(status))
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status = InstallWaveSubdevice(deviceObject, irp, resourceList,
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adapter, EndpointKind::Capture, kWaveCaptureName, &waveCapture);
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if (NT_SUCCESS(status))
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status = PcRegisterPhysicalConnection(deviceObject, waveRender,
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kRenderWaveBridgePin, topologyRender, kRenderTopologyBridgePin);
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if (NT_SUCCESS(status))
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status = PcRegisterPhysicalConnection(deviceObject, topologyCapture,
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kCaptureTopologyBridgePin, waveCapture, kCaptureWaveBridgePin);
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SafeRelease(waveCapture);
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SafeRelease(topologyCapture);
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SafeRelease(waveRender);
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SafeRelease(topologyRender);
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adapter->Release();
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if (!NT_SUCCESS(status))
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LGAUDIO_TRACE_ERROR("device start failed: 0x%08X", status);
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else
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LGAUDIO_TRACE_INFO("render and capture endpoints registered (%s)",
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"Looking Glass Audio");
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return status;
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}
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