V4l2 : difference between : Enque, Deque and Queue(ing) of the buffer?
I am a noob in v4l2 and tryign to find out the difference between the various ioctl calls made during the camera image capture. I am following this pdf from the linuxtv.org site
I wanted to know the difference between the following :
Query, Enque, Deque and Queue(ing) of the buffer. Is there a particular sequence in fetching the raw data from the camera? Does the sequence varies in case of streaming and capture mode?
Can any one plz explain.
Following state machine describes a V4L2-buffer's life-cycle:
The sequence is the same for both streaming as well as capture.
Its just that during capture one does the Q/DQ just once to obtain one buffer (i.e. a single "frame"). Streaming does this repeatedly.
Detailed info in this series of V4L2 articles...
Part 1: The Video4Linux2 API
Part 2: registration and open()
Part 3: Basic ioctl() handling
Part 4: Inputs and Outputs
Part 5a: Colors and formats
Part 5b: Format negotiation
Part 6a: Basic frame I/O
Part 6b: Streaming I/O
Part 7: Controls
- Send Text Tag to Instagram using my Android app
- Camera stops after one minute application suspend
- CameraX black screen preview on some devices
- How do some apps can access ultra wide lens camera when Camera2 API doesn't even return all cameras?
- Android 12 (SDK > 29) Extra_Output for ACTION_IMAGE_CAPTURE not working
- Attempt at YU12 to YUYV conversion resulting in noisy image
- react-native-image-picker launchCamera in not working in android
- Auto Focus and Manual focus Focus Locking Error In Camera 2 api
- Android 14 Photo Picker Camera Tile Removed From Google Chrome
- How to fix wrong rotation of photo from camera in flutter?
- How to implement pinch to zoom and camera preview kotlin
- Access denied for property "vendor.camera.aux.packagelist"
- In Flutter, how to save a camera image to a folder like DCIM?
- Click on Camera Shutter using UIAutomator
- CameraX is not configured properly. The most likely cause is you did not include a default implementation in your build such as 'camera-camera2
- How to restrict or detect an active camera device in a background process in Android?
- How to ask runtime permissions for Camera in Android , Runtime storage permissions
- While taking video camera.startCapturingVideo(null); automatically call the public void onVideoTaken(File video)
- How to Determine if an Image is in Landscape or Portrait Mode using CameraRoll in React Native
- Can you open gallery when camera app is open to get images in android studio?
- hasSystemFeature(PackageManager.FEATURE_CAMERA) returns true for device with no camera
- Camera2 Lifecycle - close device on minimize?
- Camera2 YUV formats efficiency and differences
- How to turn on front flash light programmatically in Android?
- setPreviewTexture failed in MTK device
- Android camera - Is it possible to restrict image size?
- How to take picture without preview using camera Intent?
- With Flutter image_picker we must handle the MainActivity destruction. Looking for alternative
- "Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0." -REACT-NATIVE
- Application gets killed during camera/file intent Xiaomi Android API 29