Hi,
The recent addition of timestamp types (and monotonic timestamp) left some room
for improvement. First of all not all drivers use monotonic timestamp. There are
for example mem2mem drivers that copy the timestamp from the OUTPUT buffer to
the corresponding CAPTURE buffer. Some videobuf2 drivers do not fill the
timestamp field altogether (yeah, I can agree that a constant is monotonic, but
still...).
Hence, I propose the following change to videobuf2. After applying this patch
the default timestamp type is UNKNOWN. It is up to the driver to set the
timestamp type to either MONOTONIC or COPY in vb2_queue_init.
This patch also adds setting proper timestamp type value in case of drivers
where I determined that type. This list might be missing some drivers, but
in these cases it will leave the UNKNOWN type which is a safe assumption.
Best wishes,
Kamil Debski
Kamil Debski (3):
v4l: Define video buffer flag for the COPY timestamp type
vb2: Add support for non monotonic timestamps
v4l: Set proper timestamp type in selected drivers which use
videobuf2
Documentation/DocBook/media/v4l/io.xml | 6 ++++++
drivers/media/platform/blackfin/bfin_capture.c | 1 +
drivers/media/platform/davinci/vpif_capture.c | 1 +
drivers/media/platform/davinci/vpif_display.c | 1 +
drivers/media/platform/s3c-camif/camif-capture.c | 1 +
drivers/media/platform/s5p-fimc/fimc-capture.c | 1 +
drivers/media/platform/s5p-fimc/fimc-lite.c | 1 +
drivers/media/platform/s5p-mfc/s5p_mfc.c | 2 ++
drivers/media/platform/soc_camera/atmel-isi.c | 1 +
drivers/media/platform/soc_camera/mx2_camera.c | 1 +
drivers/media/platform/soc_camera/mx3_camera.c | 1 +
.../platform/soc_camera/sh_mobile_ceu_camera.c | 1 +
drivers/media/platform/vivi.c | 1 +
drivers/media/usb/pwc/pwc-if.c | 1 +
drivers/media/usb/stk1160/stk1160-v4l.c | 1 +
drivers/media/usb/uvc/uvc_queue.c | 1 +
drivers/media/v4l2-core/videobuf2-core.c | 5 +++--
include/media/videobuf2-core.h | 1 +
include/uapi/linux/videodev2.h | 1 +
19 files changed, 27 insertions(+), 2 deletions(-)
--
1.7.9.5
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