iter5 Track E: move LAST_OUTPUT_WIDTH/HEIGHT from process-global to per-driver-data

claude-noether/libva-v4l2-request-fourier

forked from marfrit/libva-v4l2-request-fourier

Sonnet review 7.3 / 9.6 from iter1 + carried iter2/3/4 substrate.
Two libva driver_data instances in the same process (e.g. Firefox
playing two tabs at different resolutions, or Firefox + mpv via the
same dlopened backend) would race on the static cache.

Move to struct request_data.last_output_width/height. The V4L2
device fd is already per-driver_data, so this is the correct binding
unit (one fd, one current OUTPUT format).

Verified: two concurrent mpv processes (2s stagger) both decode
300 frames cleanly with no cross-corruption. Same-instant init still
hits kernel-level fd contention on /dev/video1 (hantro is a
single-instance device); cross-process serialization is out of scope
for a libva backend.

Resolves the surface_reset_format_cache() callsite: now takes
driver_data parameter (was zero-arg).

Also drops the 'rc' unused-variable warning in v4l2_ioctl_controls
that the iter5 sweep left behind.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

This commit is contained in:

Markus Fritsche

2026-05-05 15:05:41 +00:00

parent 843febc174

commit b993355507

5 changed files with 52 additions and 32 deletions

									
										src/v4l2.c
									
		-1
	
												View File
												
				@@ -433,7 +433,6 @@ static int v4l2_ioctl_controls(int video_fd, int request_fd, unsigned long ioc,

							       unsigned int num_controls)

				{

					struct v4l2_ext_controls controls;

					int rc;

					memset(&controls, 0, sizeof(controls));