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| NS_E_MIXER_INVALID_LINE | NS_E_MIXER_INVALID_VALUE |
NS_E_MIXER_INVALID_CONTROL
Where this result occurs in the Player workflow
NS_E_MIXER_INVALID_CONTROL (0xC00D0FA6) marks resolving a volume, mute or routing control on a valid mixer line. Keep this HRESULT attached to the producing operation even when the Player shows a broader message.
Mechanism
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 representative way to reach this result is that the analog CD line exists but no longer exposes the expected volume control.
State snapshot
| Evidence | Why it matters for invalid control |
|---|---|
| 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 | line ID, requested control type/ID, control count and mixerGetLineControls result |
| Controlled comparison | Repeat the producing call after changing only this condition: select a control actually exposed on that line and refresh cached control IDs. |
Controlled diagnostic sequence
- Capture
0xC00D0FA6, the exact Player/API operation and the first timestamp at which it appears. - Save line ID, requested control type/ID, control count and mixerGetLineControls result; 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: select a control actually exposed on that line and refresh cached control IDs.
Nearby codes with different owners
| Related result | Different condition |
|---|---|
NS_E_MIXER_INVALID_LINE | resolving a requested WinMM mixer line against the current driver topology |
NS_E_MIXER_INVALID_VALUE | applying a value that violates the selected mixer control’s bounds or shape |
NS_E_MIXER_UNKNOWN_MMRESULT | mapping a WinMM mixer return value not recognized by the Player wrapper |
Focused correction
For this occurrence, select a control actually exposed on that line and refresh cached control IDs. Recreate only the object that produced it and repeat the original operation against the same controlled input.
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.
The line can be valid while a requested control is absent
WinMM controls belong to a particular mixer line and advertise a control type, identifier, bounds, channels and value representation. Preserve the successfully resolved line ID before querying its controls. Then enumerate the controls actually returned by the driver and compare the requested volume, mute or routing type with that list. A control ID cached from another driver version or another line is not portable.
Do not repair this condition by substituting an arbitrary numeric control ID. First prove that the line exists; next query its control count and accepted types; finally shape the value buffer according to the selected control. A failure at the first step is a line-topology problem, while this HRESULT is specific to control resolution on an otherwise usable line.
Technical references
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