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| NS_E_MIXER_INVALID_CONTROL | NS_E_MIXER_UNKNOWN_MMRESULT |
NS_E_MIXER_INVALID_VALUE
How to investigate NS_E_MIXER_INVALID_VALUE
The code 0xC00D0FA7 narrows the event to applying a value that violates the selected mixer control’s bounds or shape. Retain the first lower-level error.
What the Player is doing
The Player’s analog CD and legacy audio paths can address a mixer destination, source line and control through the WinMM mixer API. Line identifiers, control identifiers and value shapes are supplied by the installed audio driver rather than invented by the application.
Opening an audio endpoint or hearing sound from another application does not establish that the legacy mixer line and control requested by the Player exist. A realistic trigger is that a scalar percentage is written to a multi-channel signed control without conversion.
Capture before changing state
| Evidence | Why it matters for invalid value |
|---|---|
| Producing object and operation | mixer device ID, driver name/version, destination and source line IDs, component type, control ID/type, channel count, bounds, value payload and raw MMRESULT |
| Key observation | control bounds, channels, multiple-items count, payload type and requested value |
| Controlled comparison | Repeat the producing call after changing only this condition: clamp and encode the value according to the control details returned by the driver. |
Five-step isolation test
- Capture
0xC00D0FA7, the exact Player/API operation and the first timestamp at which it appears. - Save control bounds, channels, multiple-items count, payload type and requested value; do this before ejecting media, reconnecting a device, canceling a job or rebuilding the Player object.
- Reproduce once with the original source and destination, then apply only this change: clamp and encode the value according to the control details returned by the driver.
Different conditions in the same family
| Related result | Different condition |
|---|---|
NS_E_MIXER_INVALID_CONTROL | resolving a volume, mute or routing control on a valid mixer line |
NS_E_MIXER_UNKNOWN_MMRESULT | mapping a WinMM mixer return value not recognized by the Player wrapper |
NS_E_MIXER_INVALID_LINE | resolving a requested WinMM mixer line against the current driver topology |
Correction criteria
The test is successful when you clamp and encode the value according to the control details returned by the driver, recreate the owning operation, and the original call no longer returns it.
During verification, do not write guessed control IDs or ranges into the mixer; Re-enumerate the topology after a device or driver change and retain the original MMRESULT.
Documentation
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