Hi,
On 03/10/2021 22:52, Dafna Hirschfeld wrote:
+/**
+ * struct v4l2_subdev_route - A route inside a subdev
+ *
+ * @sink_pad: the sink pad index
+ * @sink_stream: the sink stream identifier
+ * @source_pad: the source pad index
+ * @source_stream: the source stream identifier
+ * @flags: route flags V4L2_SUBDEV_ROUTE_FL_*
+ * @reserved: drivers and applications must zero this array
+ */
+struct v4l2_subdev_route {
+ __u32 sink_pad;
+ __u32 sink_stream;
+ __u32 source_pad;
+ __u32 source_stream;
+ __u32 flags;
+ __u32 reserved[5];
+};
+
I don't understand that struct, what is the meaning of the two
sink_stream, source_stream fields?
What is the relation between sink_pad and source_pad? A 'route' between
two pads means that 'streams' can flow through them?
If I have for example:
sink_pad = sink_stream = 0
source_pad = source_stream = 1
what does that mean?
It means that a stream with stream ID 0 that comes to the subdev's sink
pad 0 will be routed to the subdev's source pad 1 with stream ID 1.
So the sink_pad and source_pad tell via which pads the streams flows.
Stream IDs are numbers used to uniquely identify the stream for the
specific pad. In other words, for the subdev's pad 0, each stream ID
must be unique. That pad 0 is linked (media link) to another subdev's
pad, and on that pad there must be streams with the matching IDs.
Tomi
