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[idd] audio: add the mediated PCM data plane

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Expose cancel-safe direct-I/O queues for reading rendered frames and
writing captured frames through the private broker endpoint.

Separate render and capture storage, publish format and state
generations, and preserve local loopback while no broker is bound.
This commit is contained in:
Geoffrey McRae
2026-09-02 00:02:57 +10:00
parent e55cb8bd61
commit 5e07786468
6 changed files with 1322 additions and 63 deletions
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52
idd/LGAudio/Adapter.h
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@@ -24,6 +24,15 @@
#include "Common.h"
#include "RingBuffer.h"
struct AudioStreamSnapshot
{
KSSTATE state;
bool formatValid;
UCHAR reserved[3];
ULONGLONG generation;
FormatFingerprint format;
};
class CAudioAdapter final : public IUnknown
{
public:
@@ -33,9 +42,23 @@ public:
NTSTATUS Initialize();
_IRQL_requires_max_(DISPATCH_LEVEL)
NTSTATUS ConfigureRender(
NTSTATUS ConfigureStream(
_In_ EndpointKind kind,
_In_ const FormatFingerprint &format);
_IRQL_requires_max_(DISPATCH_LEVEL)
void SetStreamState(
_In_ EndpointKind kind,
_In_ KSSTATE state);
_IRQL_requires_max_(DISPATCH_LEVEL)
void GetStreamSnapshot(
_In_ EndpointKind kind,
_Out_ AudioStreamSnapshot *snapshot);
_IRQL_requires_max_(DISPATCH_LEVEL)
void SetBrokerActive(_In_ bool active);
_IRQL_requires_max_(DISPATCH_LEVEL)
void ResetCapture();
@@ -55,6 +78,24 @@ public:
_In_ const FormatFingerprint &format,
_In_ ULONGLONG bytes);
_IRQL_requires_max_(DISPATCH_LEVEL)
NTSTATUS ReadRenderFrames(
_In_ const FormatFingerprint &format,
_In_ ULONGLONG streamGeneration,
_Out_writes_bytes_(capacity) BYTE *data,
_In_ ULONG capacity,
_Out_ PULONG bytesRead,
_Out_ bool *discontinuity);
_IRQL_requires_max_(DISPATCH_LEVEL)
NTSTATUS WriteCaptureFrames(
_In_ const FormatFingerprint &format,
_In_ ULONGLONG streamGeneration,
_In_ bool discontinuity,
_In_reads_bytes_(bytes) const BYTE *data,
_In_ ULONG bytes,
_Out_ PULONG droppedBytes);
_IRQL_requires_max_(DISPATCH_LEVEL)
AudioClockSnapshot GetClockSnapshot() const;
@@ -66,8 +107,15 @@ public:
private:
volatile LONG m_refCount;
volatile LONG m_brokerActive;
volatile LONG m_renderDiscontinuity;
KSPIN_LOCK m_transportLock;
KSPIN_LOCK m_streamStateLock;
AudioStreamSnapshot m_renderState;
AudioStreamSnapshot m_captureState;
CAudioClock m_clock;
CAudioRingBuffer m_ring;
CAudioRingBuffer m_renderRing;
CAudioRingBuffer m_captureRing;
};
NTSTATUS StartAudioDevice(