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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. Treat this result as a checkpoint in legacy multimedia mixer topology and retain its first lower-level error.
What the Player is doing
At the checkpoint, 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. The page-specific boundary is applying a value that violates the selected mixer control’s bounds or shape.
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 |
| Decisive observation | control bounds, channels, multiple-items count, payload type and requested value |
| Generation identity | Record the same disc, device, job or Player operation generation that returned this result; a reconnect or media change creates a different test. |
| Underlying result | Keep the first device, filesystem, COM, codec, DirectShow, IMAPI or BITS result seen before the Player mapped it to this result. |
| 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. |
Interpretation guide
| Observation | Interpretation |
|---|---|
| The recorded values match the boundary | The result is consistent with applying a value that violates the selected mixer control’s bounds or shape; correct that state before changing unrelated codecs, drivers or playlists. |
| A lower layer failed before this result | Preserve that earlier HRESULT or device result because it may be only the Player-level mapping. |
| The same call passes after one isolated change | The comparison supports the invalid value diagnosis rather than a broad installation failure. |
| The code changes after retesting it | The boundary was passed; diagnose the new HRESULT as the next independent stage. |
It scopes the failure to applying a value that violates the selected mixer control’s bounds or shape.
Five-step isolation test
- Capture
0xC00D0FA7, it, 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.
- correlate the result with mixer device ID, driver name/version, destination and source line IDs, component type, control ID/type, channel count, bounds, value payload and raw MMRESULT.
- 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.
- Create a fresh operation generation and verify that the original call advances beyond the invalid value boundary.
Different boundaries in the same family
| Related result | Different diagnostic boundary |
|---|---|
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.
When verifying it, 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
- mixerOpen function.
- mixerGetLineInfo function.
- mixerGetLineControls function.
- mixerSetControlDetails function.
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