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NS_E_MIXER_NODRIVER
Diagnostic meaning beyond the standard message
The actionable meaning of 0xC00D0FAF / NS_E_MIXER_NODRIVER is opening the legacy mixer device required by the selected audio path.
Why the operation can reach this point
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. One concrete reproduction is: the endpoint exists through a newer audio API but no corresponding legacy mixer driver opens.
Evidence matrix
| Evidence | Why it matters for nodriver |
|---|---|
| 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 | mixer device count, target audio device, mixerOpen result and installed driver state |
| Controlled comparison | Repeat the producing call after changing only this condition: install or enable a mixer-capable driver, or use an audio path that does not depend on WinMM mixer control. |
Minimal experiment
- Capture
0xC00D0FAF, the exact Player/API operation and the first timestamp at which it appears. - Save mixer device count, target audio device, mixerOpen result and installed driver state; 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: install or enable a mixer-capable driver, or use an audio path that does not depend on WinMM mixer control.
Do not collapse it with these results
| Related result | Different condition |
|---|---|
NS_E_MIXER_UNKNOWN_MMRESULT | mapping a WinMM mixer return value not recognized by the Player wrapper |
NS_E_MIXER_INVALID_VALUE | applying a value that violates the selected mixer control’s bounds or shape |
NS_E_MIXER_INVALID_CONTROL | resolving a volume, mute or routing control on a valid mixer line |
Recovery and verification
Resolve the responsible precondition: Install or enable a mixer-capable driver, or use an audio path that does not depend on WinMM mixer control. A successful retest must pass the same nodriver checkpoint, not merely hide the message in a different UI path.
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.
Authoritative documentation
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