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| java.lang.Object | |
| ↳ | android.media.Image |
A single complete image buffer to use with a media source such as a
MediaCodec or a
CameraDevice.
This class allows for efficient direct application access to the pixel
data of the Image through one or more
ByteBuffers. Each buffer is encapsulated in a
Image.Plane that describes the layout of the pixel data in that plane. Due
to this direct access, and unlike the Bitmap class,
Images are not directly usable as as UI resources.
Since Images are often directly produced or consumed by hardware components, they are a limited resource shared across the system, and should be closed as soon as they are no longer needed.
For example, when using the ImageReader class to read out Images
from various media sources, not closing old Image objects will prevent the
availability of new Images once
the maximum outstanding image count is
reached. When this happens, the function acquiring new Images will typically
throw an IllegalStateException.
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| Image.Plane |
A single color plane of image data. |
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| Public Methods | |||||||||||
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Free up this frame for reuse.
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Get the crop rectangle associated with this frame.
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Get the format for this image.
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The height of the image in pixels.
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Get the array of pixel planes for this Image.
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Get the timestamp associated with this frame.
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The width of the image in pixels.
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Set the crop rectangle associated with this frame.
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Inherited Methods | |||||||||||
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From class
java.lang.Object
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From interface
java.lang.AutoCloseable
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Free up this frame for reuse.
After calling this method, calling any methods on this Image will
result in an IllegalStateException, and attempting to read from
ByteBuffers returned by an earlier
getBuffer() call will have undefined behavior.
Get the crop rectangle associated with this frame.
The crop rectangle specifies the region of valid pixels in the image, using coordinates in the largest-resolution plane.
Get the format for this image. This format determines the number of ByteBuffers needed to represent the image, and the general layout of the pixel data in each in ByteBuffer.
The format is one of the values from
ImageFormat. The mapping between the
formats and the planes is as follows:
| Format | Plane count | Layout details |
|---|---|---|
JPEG |
1 | Compressed data, so row and pixel strides are 0. To uncompress, use
BitmapFactory#decodeByteArray.
|
YUV_420_888 |
3 | A luminance plane followed by the Cb and Cr chroma planes. The chroma planes have half the width and height of the luminance plane (4:2:0 subsampling). Each pixel sample in each plane has 8 bits. Each plane has its own row stride and pixel stride. |
RAW_SENSOR |
1 | A single plane of raw sensor image data, with 16 bits per color
sample. The details of the layout need to be queried from the source of
the raw sensor data, such as
CameraDevice.
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The height of the image in pixels. For formats where some color channels are subsampled, this is the height of the largest-resolution plane.
Get the array of pixel planes for this Image. The number of planes is determined by the format of the Image.
Get the timestamp associated with this frame.
The timestamp is measured in nanoseconds, and is monotonically increasing. However, the zero point and whether the timestamp can be compared against other sources of time or images depend on the source of this image.
The width of the image in pixels. For formats where some color channels are subsampled, this is the width of the largest-resolution plane.
Set the crop rectangle associated with this frame.
The crop rectangle specifies the region of valid pixels in the image, using coordinates in the largest-resolution plane.