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documentation: Update README with AE

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dchvs 2021-03-04 00:34:39 -06:00
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@ -33,7 +33,7 @@ gst-launch-1.0 nvarguscamerasrc sensor-id=0 aelock=true awblock=true ! 'video/x-
### UDP Streaming Test ### UDP Streaming Test
#### Sender Endpoint #### Sender Endpoint
``` ```
gst-launch-1.0 nvarguscamerasrc ! 'video/x-raw(memory:NVMM), width=(int)1280, height=(int)720, format=(string)NV12,framerate=(fraction)30/1' ! omxh264enc control-rate=2 bitrate=8000000 ! 'video/x-h264, stream-format=(string)byte-stream' ! h264parse ! rtph264pay mtu=1400 ! udpsink host=$HOST_IP port=5000 sync=false async=false gst-launch-1.0 nvarguscamerasrc ! 'video/x-raw(memory:NVMM), width=(int)1280, height=(int)720, format=(string)NV12,framerate=(fraction)60/1' ! omxh264enc control-rate=2 bitrate=8000000 ! 'video/x-h264, stream-format=(string)byte-stream' ! h264parse ! rtph264pay mtu=1400 ! udpsink host=$HOST_IP port=5000 sync=false async=false
``` ```
#### Receiver Endpoint #### Receiver Endpoint
@ -71,11 +71,58 @@ v4l2-ctl -d /dev/video0 --set-fmt-video=width=1280,height=720,pixelformat=RG12 -
#### Slave #### Slave
``` ```
v4l2-ctl -d /dev/video01 --set-fmt-video=width=1280,height=720,pixelformat=RG12 --set-ctrl bypass_mode=0 --stream-mmap v4l2-ctl -d /dev/video1 --set-fmt-video=width=1280,height=720,pixelformat=RG12 --set-ctrl bypass_mode=0 --stream-mmap
```
### AE Synchronized
First run the master pipeline and then the slave pipeline:
#### Master Pipeline
```
gst-launch-1.0 nvarguscamerasrc sensor-id=1 ! 'video/x-raw(memory:NVMM), width=(int)1280, height=(int)720, format=(string)NV12,framerate=(fraction)60/1' ! fakesink
```
#### Slave Pipeline
```
gst-launch-1.0 nvarguscamerasrc sensor-id=0 aelock=true awblock=true ! 'video/x-raw(memory:NVMM), width=(int)1280, height=(int)720, format=(string)NV12,framerate=(fraction)60/1' ! fakesink
```
### Run script
```
./script_to_control_gain_exposure.sh &
``` ```
## Appends ## Appends
#### Auto Exposure
The AE controls realays in the feedback provided by the Driver's camera sensor to the nvarguscamerasrc libraries,
and the custom DTSIs with the sensor parameters definitions.
As the AE has interdependency with the digital gain. This gain it's and operation on the Driver, and follows this setup:
```bash
/*
* Digital gain equation:
*
* RANGE: 1x, 7.97x
* GAIN: VAL / STEPS;
* STEPS: 1/32
*
* SCALE FACTOR = 100.000
*
* min_gain_val = 100.000
* max_gain_val = 797.000
* step_gain_val = 3125
*/
MT9M021 sensor datasheet:
* <a href="https://files.niemo.de/aptina_pdfs/MT9M021-M031_Developer_Guide.pdf">MT9M021 Developer Guide</a>
```
Where, the min_gain_val, max_gain_val, step_gain_val are part of the cameras' DTSI (tegra186-tx2-spiri-camera.dtsi) fixed parameters
as per the datasheet. The step_gain_val consists of the steps (1/32 for the register) scaled to a value that makes this fraction become an significant
in integer.
#### Kernel Changes #### Kernel Changes
The Driver for the MT9M021 cameras consists on the following structure, that adds the DTB and Kernel sources, along with its Makefiles that lead its portability to a Kernel source. The Driver for the MT9M021 cameras consists on the following structure, that adds the DTB and Kernel sources, along with its Makefiles that lead its portability to a Kernel source.