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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. Keep the object generation and lower-level result attached to the result event.
Why the operation can reach this point
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 opening the legacy mixer device required by the selected audio path.
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 |
| Decisive observation | mixer device count, target audio device, mixerOpen result and installed driver state |
| 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: install or enable a mixer-capable driver, or use an audio path that does not depend on WinMM mixer control. |
Decision matrix
| Observation | Interpretation |
|---|---|
| The recorded values match the boundary | The result is consistent with opening the legacy mixer device required by the selected audio path; 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 this result may be only the Player-level mapping. |
| The same call passes after one isolated change | The comparison supports the nodriver 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 opening the legacy mixer device required by the selected audio path.
Minimal experiment
- Capture
0xC00D0FAF, it, 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.
- 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: install or enable a mixer-capable driver, or use an audio path that does not depend on WinMM mixer control.
- Create a fresh operation generation and verify that the original call advances beyond the nodriver boundary.
Do not collapse it with these results
| Related result | Different diagnostic boundary |
|---|---|
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 by ensuring that you 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.
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.
Authoritative documentation
- mixerOpen function.
- mixerGetLineInfo function.
- mixerGetLineControls function.
- mixerSetControlDetails function.
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