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NS_E_MIXER_INVALID_LINE
Where this result occurs in the Player workflow
NS_E_MIXER_INVALID_LINE (0xC00D0FA5) marks resolving a requested WinMM mixer line against the current driver topology. 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 requested WinMM mixer line against the current driver topology.
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 a cached CD-audio source-line ID is reused after the sound driver changes.
State snapshot
| Evidence | Why it matters for invalid line |
|---|---|
| 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, destination/source IDs, component type, line flags and mixerGetLineInfo 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: re-enumerate lines and use an identifier returned by the current driver. |
How to interpret the next test
| Observation | Interpretation |
|---|---|
| The recorded values match the boundary | The result is consistent with resolving a requested WinMM mixer line against the current driver topology; 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 line 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 requested WinMM mixer line against the current driver topology.
Controlled diagnostic sequence
- Capture
0xC00D0FA5, it, the exact Player/API operation and the first timestamp at which it appears. - Save mixer device, destination/source IDs, component type, line flags and mixerGetLineInfo 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: re-enumerate lines and use an identifier returned by the current driver.
- Create a fresh operation generation and verify that the original call advances beyond the invalid line boundary.
Nearby codes with different owners
| Related result | Different diagnostic boundary |
|---|---|
NS_E_MIXER_INVALID_CONTROL | resolving a volume, mute or routing control on a valid mixer line |
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, re-enumerate lines and use an identifier returned by the current driver. 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.
A mixer line is a topology node, not a volume control
mixerGetLineInfo resolves destinations and sources such as speakers, wave output or analog CD input. Capture the mixer device ID, destination index, source index, component type and returned line identifier. After a driver change, a cached line ID can identify nothing even though the same endpoint name is visible elsewhere. Re-enumeration must begin at the destination/source topology rather than at individual controls.
A useful comparison is to query the line by component type and then by destination/source coordinates. If both fail, the requested topology node is absent. If the line resolves and only a later control query fails, the correct result belongs to the control layer rather than it.
Technical references
- mixerOpen function.
- mixerGetLineInfo function.
- mixerGetLineControls function.
- mixerSetControlDetails function.
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