intel-vaapi-media February 2019

intel-vaapi-media@lists.01.org

2 participants
3 discussions

The advantage of binding between Surface and Context.

by Hirokazu Honda

Hi, According to libva document (http://01org.github.io/libva_staging_doxygen/group__api__core.html#ga4af3...), Surfaces are bound to a context if passing them as an argument when creating the context. Seeing intel-vaapi-driver code, the surfaces are just stored in object_context.render_targets. A surface processed by vaBeginPicture()-vaRenderPicture()-vaEndPicture() are specified in vaBeginPicture(). (object_context.current_render_target) It looks like a surface can be processed using a context by being specified in vaBeginPicture(), even if it is not bound to the context. Here, my questions are below. What is the advantage of binding? In what circumstances do we need to associate the context with surfaces? In which scenarios passing surfaces to vaCreateContext is required, and in which it is not? Best Regards, Hirokazu Honda

1 year, 8 months

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Correct way to detect supported JPEG supported subsampling formats

by Andres Calderon Jaramillo

Hi all, I'm needing to detect which chroma subsampling formats are supported by the VAAPI driver for JPEG decoding. Currently, I'm doing vaQueryConfigAttributes() and reading the value of the VAConfigAttribRTFormat. Is this the expected way to do it? Or do I have to do something with vaQuerySurfaceAttributes? Thanks! Andres

1 year, 12 months

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Effect of i915.enable_ppgtt=0 linux kernel parameter on h264 encoder output

by Gurpartap Singh

There are few questions regarding GTT and PPGTT related to h264 encoder. We are using libdrm 2.4.74 and intel-vaapi-driver and libva to encode YUV into h264. 1. By default intel-vaapi-driver uses GTT or PPGTT address space? We are using baytrail series gpu which is 7th generation.. 2. Will it affect encoded output if I pass i915.enable_ppgtt=0 to linux kernel commandline ?

2 years

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intel-vaapi-media February 2019