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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 NS_E_MIXER_NODRIVER event.
Why the operation can reach this point
At the NS_E_MIXER_NODRIVER 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.
For NS_E_MIXER_NODRIVER, 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 NS_E_MIXER_NODRIVER; 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 NS_E_MIXER_NODRIVER. |
| 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 NS_E_MIXER_NODRIVER | Preserve that earlier HRESULT or device result because NS_E_MIXER_NODRIVER 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 NS_E_MIXER_NODRIVER | The NS_E_MIXER_NODRIVER boundary was passed; diagnose the new HRESULT as the next independent stage. |
NS_E_MIXER_NODRIVER scopes the failure to opening the legacy mixer device required by the selected audio path. The presence of NS_E_MIXER_NODRIVER does not establish a system-wide media failure; verify its owning operation before changing unrelated Player components.
Minimal experiment
- Capture
0xC00D0FAF,NS_E_MIXER_NODRIVER, 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.
- For
NS_E_MIXER_NODRIVER, 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 NS_E_MIXER_NODRIVER, 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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