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98 lines
3.3 KiB
98 lines
3.3 KiB
7 months ago
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## Camera Device HAL ##
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---
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## Overview: ##
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The camera.device HAL interface is used by the Android camera service to operate
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individual camera devices. Instances of camera.device HAL interface can be obtained
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via one of the ICameraProvider::getCameraDeviceInterface_V<N>_x() methods, where N
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is the major version of the camera device interface.
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Obtaining the device interface does not turn on the respective camera device;
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each camera device interface has an actual open() method to begin an active
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camera session. Without invoking open(), the interface can be used for querying
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camera static information.
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More complete information about the Android camera HAL and subsystem can be found at
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[source.android.com](http://source.android.com/devices/camera/index.html).
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## Version history: ##
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### ICameraDevice.hal@1.0:
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HIDL version of the legacy camera device HAL. Intended as a shim for devices
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needing to use the deprecated pre-HIDL camera device HAL v1.0.
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May be used in HIDL passthrough mode for devices upgrading to the Android O
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release; must be used in binderized mode for devices launching in the O release.
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It is strongly recommended to not use this interface for new devices, as new
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devices may not use this interface starting with the Android P release, and all
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support for ICameraDevice@1.0 will be removed with the Android R release.
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This HAL interface version only allows support at the LEGACY level for the
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android.hardware.camera2 API.
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Added in Android 8.0.
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Subsidiary HALs:
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#### ICameraDevice1PreviewCallback.hal@1.0:
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Callback interface for obtaining, filling, and returning graphics buffers for
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preview operation with the ICameraDevice@1.0 inteface.
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#### ICameraDevice1Callback.hal@1.0:
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Callback interface for sending events and data buffers from the HAL to the
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camera service.
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### ICameraDevice.hal@3.2:
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HIDL version of the baseline camera device HAL, required for LIMITED or FULL
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operation through the android.hardware.camera2 API.
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The main HAL contains methods for static queries about the device, similar to
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the HALv3-specific sections of the legacy camera module HAL. Simply obtaining an
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instance of the camera device interface does not turn on the camera device.
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May be used in passthrough mode for devices upgrading to the Android O release;
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must be used in binderized mode for all new devices launching with Android O or
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later.
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The open() method actually opens the camera device for use, returning a Session
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interface for operating the active camera. It takes a Callback interface as an
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argument.
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Added in Android 8.0.
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Subsidiary HALs:
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#### ICameraDevice3Session.hal@3.2:
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Closely matches the features and operation of the pre-HIDL camera device HAL
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v3.2, containing methods for configuring an active camera device and submitting
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capture requests to it.
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#### ICameraDevice3Callback.hal@3.2:
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Callback interface for sending completed captures and other asynchronous events
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from tehe HAL to the client.
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### ICameraDevice.hal@3.3:
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A minor revision to the ICameraDevice.hal@3.2.
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- Adds support for overriding the output dataspace of a stream, which was
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supported in the legacy camera HAL.
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Added in Android 8.1.
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### ICameraDevice.hal@3.4:
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A minor revision to the ICameraDevice.hal@3.3.
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- Adds support for session parameters during stream configuration.
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Added in Android 9
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