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Xilinx Scene Change Detection IP (SCD)
--------------------------------------
The Xilinx Scene Change Detection IP contains two blocks: one IP block is used
for reading video frame data from memory to the device and the other IP block
is used for determining whether there is a scene change between current and the
previous frame. The IP supports YUV planar and semi-planar formats. IP only
needs luma frame to determine the scene change event. The IP supports memory
based model, which means that it will accept a dma buffer address and perform
MEM2DEV transfer followed by statistical based image processing and give the
data back to application if scene change detection is present or not.
Another version of scene change detection IP which supports streaming model,
which means that IP can be inserted in a capture pipeline. For example,
"hdmirx -> streaming-scd -> fb_wr" is a typical capture pipeline where
streaming SCD can be embedded. The IP accespts the AXI video data and perform
histogram based statistical analysis to detect scene change. The IP supports
single channel.
Required properties:
- compatible: Should be "xlnx,v-scd"
- reg: Physical base address and length of the registers set for the device
- clocks: Reference to the video core clock.
- reset-gpios: Specifier for a GPIO that assert SCD (AP_RST_N) reset.
- xlnx,memory-based: This is to differentiate between memory based and
streaming based IP. The value is 1 for memory based and 0 for streaming
based IPs.
- xlnx,numstreams: Maximum active streams IP can support is 8 and this is based
on the design.
- xlnx,addrwidth: Size of dma address pointer in IP (either 32 or 64)
- subdev: Each channel will have its own subdev node. Each subdev will have its
sink port.
- port: Video port, using the DT bindings defined in ../video-interfaces.txt.
Example:
1. Memory based device tree
The following example shows how the device tree would look like for a memory
based design where 8 streams are enabled.
scd: scenechange@a0100000 {
compatible = "xlnx,v-scd";
reg = <0x0 0xa0100000 0x0 0x1fff>;
clocks = <&misc_clk_0>;
interrupt-parent = <&gic>;
interrupts = <0 90 4>;
reset-gpios = <&gpio 94 1>;
xlnx,memory-based;
xlnx,numstreams = <8>;
xlnx,addrwidth = <0x20>;
#address-cells = <1>;
#size-cells = <0>;
#dma-cells = <1>;
subdev@0 {
port@0 {
reg = <0>;
scd_in0: endpoint {
remote-endpoint = <&vcap0_out0>;
};
};
};
subdev@1 {
port@0 {
reg = <0>;
scd_in1: endpoint {
remote-endpoint = <&vcap0_out1>;
};
};
};
subdev@2 {
port@0 {
reg = <0>;
scd_in2: endpoint {
remote-endpoint = <&vcap0_out2>;
};
};
};
subdev@3 {
port@0 {
reg = <0>;
scd_in3: endpoint {
remote-endpoint = <&vcap0_out3>;
};
};
};
subdev@4 {
port@0 {
reg = <0>;
scd_in4: endpoint {
remote-endpoint = <&vcap0_out4>;
};
};
};
subdev@5 {
port@0 {
reg = <0>;
scd_in5: endpoint {
remote-endpoint = <&vcap0_out5>;
};
};
};
subdev@6 {
port@0 {
reg = <0>;
scd_in6: endpoint {
remote-endpoint = <&vcap0_out6>;
};
};
};
subdev@7 {
port@0 {
reg = <0>;
scd_in7: endpoint {
remote-endpoint = <&vcap0_out7>;
};
};
};
};
2. Streaming based device tree
The following example shows how the device tree would look like for a streaming
based design.
scd: scenechange@a0280000 {
compatible = "xlnx,v-scd";
reg = <0x0 0xa0280000 0x0 0x1fff>;
clocks = <&clk 72>;
interrupt-parent = <&gic>;
interrupts = <0 111 4>;
reset-gpios = <&gpio 100 1>;
#address-cells = <1>;
#size-cells = <0>;
xlnx,numstreams = <1>;
scd {
port@0 {
reg = <0x0>;
scd_in0: endpoint {
remote-endpoint = <&vpss_scaler_out>;
};
};
port@1 {
reg = <0x1>;
scd_out0: endpoint {
remote-endpoint = <&vcap_hdmi_in_1>;
};
};
};
};
|
