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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. Preserve that boundary even when the visible Player message is broader than the producing operation.
Mechanism
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 resolving a volume, mute or routing control on a valid mixer line.
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 |
| Decisive observation | line ID, requested control type/ID, control count and mixerGetLineControls result |
| 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: select a control actually exposed on that line and refresh cached control IDs. |
How to interpret the next test
| Observation | Interpretation |
|---|---|
| The recorded values match the boundary | The result is consistent with resolving a volume, mute or routing control on a valid mixer line; 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 control 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 resolving a volume, mute or routing control on a valid mixer line.
Controlled diagnostic sequence
- Capture
0xC00D0FA6, it, 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.
- 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: select a control actually exposed on that line and refresh cached control IDs.
- Create a fresh operation generation and verify that the original call advances beyond the invalid control boundary.
Nearby codes with different owners
| Related result | Different diagnostic boundary |
|---|---|
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.
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.
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
- mixerOpen function.
- mixerGetLineInfo function.
- mixerGetLineControls function.
- mixerSetControlDetails function.
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