[FFmpeg-devel] [PATCH][VAAPI][2/6] Add common data structures and helpers (take 2)

Gwenole Beauchesne gbeauchesne
Tue Mar 3 13:40:09 CET 2009


Here is a new patch with the suggested changes. I kept the overview below 
and added new changes.

Note: this depends on the alloc/free_frame_buffer() and hwaccel_data 

> The buf/buf_size args to AVHWAccel::start_frame() are particularly useful for 
> optimization purposes. Whenever possible, slice data chunks are directly 
> copied to mapped HW memory. Otherwise, they are accumulated to a temporary 
> buffer that will be copied in end_frame().
> - vaapi_slice_data_prepare() [usually called in ::start_frame()]
> - vaapi_slice_data_append()  [usually called in ::decode_slice()]
> - vaapi_slice_data_commit()  [usually called in ::end_frame()]
> The same happens for slice control blocks. If we can predetermine the number 
> of slices, we can map the whole slice params buffer from HW memory space. 
> Otherwise, they are accumulated to a temporary buffer that is also copied in 
> end_frame().
> - vaapi_slice_params_prepare() [usually called in ::start_frame()]
> - vaapi_slice_params_next()    [usually called in ::decode_slice()]
> - vaapi_slice_params_commit()  [usually called in ::end_frame()]
> Other helpers include:
> - vaapi_common_end_frame(): common commit code to the HW accelerator
> - vaapi_render_picture(): doing the actual rendering

- ff_vaapi_destroy_picture(): implements AVHWAccel::close() for 
hwaccel_data_private destruction.

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