test0r
58a0e8baf9
Pure utility additions, no behaviour change. Three helpers in
src/v4l2.{c,h}:
- v4l2_query_ext_ctrl(): wraps VIDIOC_QUERY_EXT_CTRL by CID.
Returns 0 if the control exists, -1 if not. Caller passes NULL
qec to test existence only.
- v4l2_query_menu(): wraps VIDIOC_QUERYMENU at a given index.
Returns 0 if a menu item exists at that index, -1 otherwise.
- v4l2_ctrl_menu_has_value(): convenience layered on the above.
For a menu/intmenu-type control, walks all menu items between
minimum and maximum and returns true iff `value` is a valid
entry. Used by callers that ask "does this driver accept menu
value X for this CID?" without caring about iteration details.
These unblock commit 3 (request_pool — needs ext-ctrl probing for
codec-ops dispatch) and commit 4 (probe-then-set DECODE_MODE/
START_CODE — replaces 0002's unconditional set with a real probe)
of the upstreamable design's six-commit series.
Forward-declarations in v4l2.h keep the header lean: existing
prototypes already use opaque struct v4l2_ext_control * pointers
without including <linux/videodev2.h>; we follow the same
convention for struct v4l2_query_ext_ctrl and struct v4l2_querymenu.
No call sites added in this commit. Compile-only verification:
the .so links cleanly with three new exports.
Signed-off-by: Markus Fritsche <fritsche.markus@gmail.com>
v4l2-request libVA Backend
About
This libVA backend is designed to work with the Linux Video4Linux2 Request API that is used by a number of video codecs drivers, including the Video Engine found in most Allwinner SoCs.
Status
The v4l2-request libVA backend currently supports the following formats:
- MPEG2 (Simple and Main profiles)
- H264 (Baseline, Main and High profiles)
- H265 (Main profile)
Instructions
In order to use this libVA backend, the v4l2_request driver has to
be specified through the LIBVA_DRIVER_NAME environment variable, as
such:
export LIBVA_DRIVER_NAME=v4l2_request
A media player that supports VAAPI (such as VLC) can then be used to decode a video in a supported format:
vlc path/to/video.mpg
Sample media files can be obtained from:
http://samplemedia.linaro.org/MPEG2/
http://samplemedia.linaro.org/MPEG4/SVT/
Technical Notes
Surface
A Surface is an internal data structure never handled by the VA's user containing the output of a rendering. Usualy, a bunch of surfaces are created at the begining of decoding and they are then used alternatively. When created, a surface is assigned a corresponding v4l capture buffer and it is kept until the end of decoding. Syncing a surface waits for the v4l buffer to be available and then dequeue it.
Note: since a Surface is kept private from the VA's user, it can ask to directly render a Surface on screen in an X Drawable. Some kind of implementation is available in PutSurface but this is only for development purpose.
Context
A Context is a global data structure used for rendering a video of a certain format. When a context is created, input buffers are created and v4l's output (which is the compressed data input queue, since capture is the real output) format is set.
Picture
A Picture is an encoded input frame made of several buffers. A single input can contain slice data, headers and IQ matrix. Each Picture is assigned a request ID when created and each corresponding buffer might be turned into a v4l buffers or extended control when rendered. Finally they are submitted to kernel space when reaching EndPicture.
The real rendering is done in EndPicture instead of RenderPicture because the v4l2 driver expects to have the full corresponding extended control when a buffer is queued and we don't know in which order the different RenderPicture will be called.
Image
An Image is a standard data structure containing rendered frames in a usable pixel format. Here we only use NV12 buffers which are converted from sunxi's proprietary tiled pixel format with tiled_yuv when deriving an Image from a Surface.