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NS_S_WMP_LOADED_PNG_IMAGE
Windows Media Player loaded a PNG image
NS_S_WMP_LOADED_PNG_IMAGE is HRESULT 856129 (0x000D1041) from Windows Media. The documented description is “Successfully loaded a PNG file.” The severity bit indicates a nonfailure result, but the value carries a specific condition that must not be collapsed into plain S_OK.
In the legacy Windows Media pipeline or Player state, this result means that successfully loaded a PNG file. It is actionable success information: the result must be interpreted before the caller advances its workflow.
What must be true before accepting it
Verify that alpha, color profile, dimensions, and decoded surface are suitable for the requested UI element. A valid return path and an application-level completed request are not automatically the same thing.
Determine whether ownership, buffers, callbacks, or resources changed before choosing recovery.
Where the status is encountered
- Windows Media source, reader, writer, or renderer callbacks; log the exact method and object state instead of interpreting the constant outside that contract.
- Windows Media Player SDK automation; log the exact method and object state instead of interpreting the constant outside that contract.
- Media graph, playlist, image, rights, or buffering state; log the exact method and object state instead of interpreting the constant outside that contract.
Evidence to preserve
- Preserve source URI and hash.
- Preserve pixel dimensions.
- Preserve alpha and color type.
- Preserve decoded memory size.
- Preserve destination surface.
Correct handling and recovery
Use the image after validating dimensions and alpha behavior. Preserve the source hash and avoid silently substituting another format on later reloads.
Practical scenario
A PNG album-art asset loads successfully. The player validates its alpha channel and scales it within the artwork bounds.
Difference from nearby results
PNG-specific validation
Validate the PNG chunk stream as well as the decoded pixels. The IHDR color type and bit depth determine channel layout; PLTE and tRNS affect indexed transparency; gAMA, sRGB, and iCCP can change color appearance; and Adam7 interlacing changes how partial decode surfaces are populated.
- Check chunk CRC results and reject impossible dimensions before allocating the destination surface.
- Record whether alpha is straight or premultiplied when the decoded bitmap is handed to the Windows Media Player skin compositor.
- Apply one deterministic color-management policy when several color-description chunks are present.
- Bound decompressed row size and total pixel memory independently of the compact PNG byte length.
A useful PNG test set includes opaque true-color, indexed transparency, full alpha, an embedded profile, and an interlaced image. Comparing these cases catches blending and color regressions that an ordinary “image loaded” check cannot detect.
References
- Microsoft: Windows Media Format SDK error codes — official Microsoft material relevant to this HRESULT.
- Microsoft: Windows Media Player SDK
- Microsoft: Windows Media Player buffering event
- Microsoft: HRESULT values
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