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[idd] audio: discipline playback clock from client

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Forward coalesced feedback through the broker to the render clock.

Keep capture independent and apply the rate to WaveRT timing.

Bound and slew targets, then restore unity when feedback stalls.

Withdraw feedback after the watchdog makes fallback safe.
This commit is contained in:
Geoffrey McRae
2026-09-05 06:32:14 +10:00
parent f7b1133785
commit 5681dcdbe7
10 changed files with 679 additions and 60 deletions
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19
idd/LGCommon/LGAudioBroker.h
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@@ -102,6 +102,9 @@ static constexpr UINT32 IOCTL_LGAUDIO_BROKER_UNBIND =
static constexpr UINT32 IOCTL_LGAUDIO_BROKER_QUERY_STATS =
CTL_CODE(FILE_DEVICE_UNKNOWN, 0x904, METHOD_BUFFERED,
FILE_READ_ACCESS | FILE_WRITE_ACCESS);
static constexpr UINT32 IOCTL_LGAUDIO_BROKER_SET_CLOCK_CONTROL =
CTL_CODE(FILE_DEVICE_UNKNOWN, 0x905, METHOD_BUFFERED,
FILE_READ_ACCESS | FILE_WRITE_ACCESS);
#pragma pack(push, 8)
@@ -209,6 +212,20 @@ struct LGAudioBrokerStats
UINT64 reserved[4];
};
struct LGAudioBrokerClockControl
{
UINT32 size;
UINT32 version;
UINT32 flags;
UINT32 reserved0;
UINT64 adapterGeneration;
UINT64 bindingGeneration;
UINT64 streamGeneration;
// Absolute render frames per second in unsigned Q32.32 format.
UINT64 targetRateQ32;
UINT64 reserved[2];
};
#pragma pack(pop)
static_assert(sizeof(LGAudioBrokerHeader) == 8,
@@ -227,6 +244,8 @@ static_assert(sizeof(LGAudioBrokerBind) == 48,
"LGAudio broker binding layout changed");
static_assert(sizeof(LGAudioBrokerStats) == 160,
"LGAudio broker statistics layout changed");
static_assert(sizeof(LGAudioBrokerClockControl) == 64,
"LGAudio broker clock-control layout changed");
static_assert(LGAUDIO_BROKER_MAX_PAYLOAD_BYTES >=
(192000U / 100U) * 8U * 3U,
"LGAudio broker payload cannot hold 10 ms at the maximum format");