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iter38: multi-device probe — single libva session serves all 5 codecs

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Probe BOTH rkvdec and hantro-vpu at VA_DRIVER_INIT and keep their
{video,media}_fd pairs in driver_data. RequestQueryConfigProfiles
enumerates the union of supported profiles from all open fds.
RequestCreateConfig retargets driver_data->{video,media}_fd to the
device that serves the requested profile; if a switch is needed
(active fd is wrong), tears down output_pool, capture_pool, video_format
cache, and fmt_valid so the next RequestCreateContext rebuilds them
on the new device.

Profile→device map (RK3399-shaped):
  H264 / HEVC / VP9  → rkvdec
  MPEG-2 / VP8       → hantro-vpu

Honours LIBVA_V4L2_REQUEST_VIDEO_PATH / MEDIA_PATH explicit overrides
(skips alt-probe when those are set).

Closes the 'libva multi-device probe' open item from iter36/iter37
campaign-close.
This commit is contained in:
Claude (noether)
2026-05-14 18:52:12 +00:00
parent 25d3e5f06f
commit c56a77bd4c
3 changed files with 302 additions and 71 deletions
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src/request.h
+29
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@@ -56,6 +56,27 @@ struct request_data {
int video_fd;
int media_fd;
/*
* iter38: multi-device probe. RK3399 has two V4L2 stateless decoders:
* - rkvdec → H264 / HEVC / VP9
* - hantro-vpu (rk3399-vpu-dec) → MPEG-2 / VP8
* At VA_DRIVER_INIT we probe both, open their fds, and store them
* here. driver_data->video_fd / media_fd above are the "active" fds
* (point at one of the pairs below). RequestCreateConfig retargets
* them based on the profile's required device. Pools and video_format
* are torn down at retarget time so the next CreateContext rebuilds
* them against the right device.
*
* -1 means that device kind isn't present on this kernel boot.
* Honours LIBVA_V4L2_REQUEST_VIDEO_PATH / MEDIA_PATH explicit
* overrides — when those are set, only the single requested device
* is opened and the alt fds stay -1.
*/
int video_fd_rkvdec;
int media_fd_rkvdec;
int video_fd_hantro;
int media_fd_hantro;
struct video_format *video_format;
/*
@@ -117,4 +138,12 @@ struct request_data {
VAStatus VA_DRIVER_INIT_FUNC(VADriverContextP context);
VAStatus RequestTerminate(VADriverContextP context);
/*
* iter38: retarget driver_data->{video,media}_fd to the device required by
* `profile`. Returns 0 on success, -1 on profile not mappable to any kind.
* Defined in request.c.
*/
int request_switch_device_for_profile(struct request_data *driver_data,
VAProfile profile);
#endif