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NF:d3d11.ID3D11VideoContext.DecoderBeginFrame |
ID3D11VideoContext::DecoderBeginFrame (d3d11.h) |
Starts a decoding operation to decode a video frame. |
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mf\id3d11videocontext_decoderbeginframe.htm |
mf |
395B06D8-1BCF-44F2-9F69-A183C30E36B7 |
12/05/2018 |
DecoderBeginFrame, DecoderBeginFrame method [Media Foundation], DecoderBeginFrame method [Media Foundation],ID3D11VideoContext interface, ID3D11VideoContext interface [Media Foundation],DecoderBeginFrame method, ID3D11VideoContext.DecoderBeginFrame, ID3D11VideoContext::DecoderBeginFrame, d3d11/ID3D11VideoContext::DecoderBeginFrame, mf.id3d11videocontext_decoderbeginframe |
d3d11.h |
Windows |
Windows 8 [desktop apps \| UWP apps] |
Windows Server 2012 [desktop apps \| UWP apps] |
Windows |
19H1 |
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Starts a decoding operation to decode a video frame.
A pointer to the ID3D11VideoDecoder interface. To get this pointer, call ID3D11VideoDevice::CreateVideoDecoder.
A pointer to the ID3D11VideoDecoderOutputView interface. This interface describes the resource that will receive the decoded frame. To get this pointer, call ID3D11VideoDevice::CreateVideoDecoderOutputView.
The size of the content key that is specified in pContentKey. If pContentKey is NULL, set ContentKeySize to zero.
An optional pointer to a content key that was used to encrypt the frame data. If no content key was used, set this parameter to NULL. If the caller provides a content key, the caller must use the session key to encrypt the content key.
If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code. D3DERR_WASSTILLDRAWING or E_PENDING is returned if the hardware is busy, in which case the decoder should try to make the call again.
After this method is called, call ID3D11VideoContext::SubmitDecoderBuffers to perform decoding operations. When all decoding operations have been executed, call ID3D11VideoContext::DecoderEndFrame.
Each call to DecoderBeginFrame must have a matching call to DecoderEndFrame. In most cases you cannot nest DecoderBeginFrame calls, but some codecs, such as like VC-1, can have nested DecoderBeginFrame calls for special operations like post processing.
The following encryption scenarios are supported through the content key:
- The decoder can choose to not encrypt every frame, for example it may only encrypt the I frames and not encrypt the P/B frames. In these scenario, the decoder will specify pContentKey = NULL and ContentKeySize = 0 for those frames that it does not encrypt.
- The decoder can choose to encrypt the compressed buffers using the session key. In this scenario, the decoder will specify a content key containing all zeros.
- The decoder can choose to encrypt the compressed buffers using a separate content key. In this scenario, the decoder will ECB encrypt the content key using the session key and pass the encrypted content key.