lib/timer: Add timer infrastructure

Some sources simply fill the buffers passed by the USB subsystem and
return them as quickly as possible. Particularly with compressed
formats operating at superspeed this rapidly results in unrealistic
frame rates.

Add infrastructure that allows us to define a specific
framerate and introduce blocking calls that constrain those sources
to the framerates expected by the host.

Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/meson.build b/lib/meson.build
index f6991d5..a0d67d5 100644
--- a/lib/meson.build
+++ b/lib/meson.build
@@ -6,6 +6,7 @@ libuvcgadget_sources = files([
   'jpg-source.c',
   'stream.c',
   'test-source.c',
+  'timer.c',
   'uvc.c',
   'v4l2.c',
   'v4l2-source.c',