Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 51 insertions, 0 deletions

diff --git a/Documentation/media/uapi/v4l/pixfmt-meta-uvc.rst b/Documentation/media/uapi/v4l/pixfmt-meta-uvc.rst
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+.. -*- coding: utf-8; mode: rst -*-
+
+.. _v4l2-meta-fmt-uvc:
+
+*******************************
+V4L2_META_FMT_UVC ('UVCH')
+*******************************
+
+UVC Payload Header Data
+
+
+Description
+===========
+
+This format describes standard UVC metadata, extracted from UVC packet headers
+and provided by the UVC driver through metadata video nodes. That data includes
+exact copies of the standard part of UVC Payload Header contents and auxiliary
+timing information, required for precise interpretation of timestamps, contained
+in those headers. See section "2.4.3.3 Video and Still Image Payload Headers" of
+the "UVC 1.5 Class specification" for details.
+
+Each UVC payload header can be between 2 and 12 bytes large. Buffers can
+contain multiple headers, if multiple such headers have been transmitted by the
+camera for the respective frame. However, the driver may drop headers when the
+buffer is full, when they contain no useful information (e.g. those without the
+SCR field or with that field identical to the previous header), or generally to
+perform rate limiting when the device sends a large number of headers.
+
+Each individual block contains the following fields:
+
+.. flat-table:: UVC Metadata Block
+    :widths: 1 4
+    :header-rows:  1
+    :stub-columns: 0
+
+    * - Field
+      - Description
+    * - __u64 ts;
+      - system timestamp in host byte order, measured by the driver upon
+        reception of the payload
+    * - __u16 sof;
+      - USB Frame Number in host byte order, also obtained by the driver as
+        close as possible to the above timestamp to enable correlation between
+        them
+    * - :cspan:`1` *The rest is an exact copy of the UVC payload header:*
+    * - __u8 length;
+      - length of the rest of the block, including this field
+    * - __u8 flags;
+      - Flags, indicating presence of other standard UVC fields
+    * - __u8 buf[];
+      - The rest of the header, possibly including UVC PTS and SCR fields