255 lines
8.9 KiB
Java
255 lines
8.9 KiB
Java
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.graphics;
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public class ImageFormat {
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/*
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* these constants are chosen to be binary compatible with their previous
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* location in PixelFormat.java
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*/
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public static final int UNKNOWN = 0;
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/**
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* RGB format used for pictures encoded as RGB_565. See
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* {@link android.hardware.Camera.Parameters#setPictureFormat(int)}.
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*/
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public static final int RGB_565 = 4;
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/**
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* <p>Android YUV format.</p>
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*
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* <p>This format is exposed to software decoders and applications.</p>
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*
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* <p>YV12 is a 4:2:0 YCrCb planar format comprised of a WxH Y plane followed
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* by (W/2) x (H/2) Cr and Cb planes.</p>
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*
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* <p>This format assumes
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* <ul>
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* <li>an even width</li>
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* <li>an even height</li>
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* <li>a horizontal stride multiple of 16 pixels</li>
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* <li>a vertical stride equal to the height</li>
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* </ul>
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* </p>
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*
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* <pre> y_size = stride * height
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* c_stride = ALIGN(stride/2, 16)
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* c_size = c_stride * height/2
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* size = y_size + c_size * 2
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* cr_offset = y_size
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* cb_offset = y_size + c_size</pre>
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*
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* <p>This format is guaranteed to be supported for camera preview images since
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* API level 12; for earlier API versions, check
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* {@link android.hardware.Camera.Parameters#getSupportedPreviewFormats()}.
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*
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* <p>Note that for camera preview callback use (see
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* {@link android.hardware.Camera#setPreviewCallback}), the
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* <var>stride</var> value is the smallest possible; that is, it is equal
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* to:
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*
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* <pre>stride = ALIGN(width, 16)</pre>
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*
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* @see android.hardware.Camera.Parameters#setPreviewCallback
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* @see android.hardware.Camera.Parameters#setPreviewFormat
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* @see android.hardware.Camera.Parameters#getSupportedPreviewFormats
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* </p>
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*/
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public static final int YV12 = 0x32315659;
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/**
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* <p>Android Y8 format.</p>
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*
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* <p>Y8 is a YUV planar format comprised of a WxH Y plane only, with each pixel
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* being represented by 8 bits. It is equivalent to just the Y plane from {@link #YV12}
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* format.</p>
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*
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* <p>This format assumes
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* <ul>
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* <li>an even width</li>
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* <li>an even height</li>
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* <li>a horizontal stride multiple of 16 pixels</li>
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* </ul>
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* </p>
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*
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* <pre> y_size = stride * height </pre>
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*
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* <p>For example, the {@link android.media.Image} object can provide data
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* in this format from a {@link android.hardware.camera2.CameraDevice}
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* through a {@link android.media.ImageReader} object if this format is
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* supported by {@link android.hardware.camera2.CameraDevice}.</p>
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*
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* @see android.media.Image
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* @see android.media.ImageReader
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* @see android.hardware.camera2.CameraDevice
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*
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* @hide
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*/
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public static final int Y8 = 0x20203859;
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/**
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* <p>Android Y16 format.</p>
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*
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* Y16 is a YUV planar format comprised of a WxH Y plane, with each pixel
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* being represented by 16 bits. It is just like {@link #Y8}, but has 16
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* bits per pixel (little endian).</p>
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*
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* <p>This format assumes
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* <ul>
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* <li>an even width</li>
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* <li>an even height</li>
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* <li>a horizontal stride multiple of 16 pixels</li>
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* </ul>
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* </p>
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*
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* <pre> y_size = stride * height </pre>
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*
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* <p>For example, the {@link android.media.Image} object can provide data
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* in this format from a {@link android.hardware.camera2.CameraDevice}
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* through a {@link android.media.ImageReader} object if this format is
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* supported by {@link android.hardware.camera2.CameraDevice}.</p>
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*
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* @see android.media.Image
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* @see android.media.ImageReader
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* @see android.hardware.camera2.CameraDevice
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*
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* @hide
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*/
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public static final int Y16 = 0x20363159;
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/**
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* YCbCr format, used for video. Whether this format is supported by the
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* camera hardware can be determined by
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* {@link android.hardware.Camera.Parameters#getSupportedPreviewFormats()}.
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*/
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public static final int NV16 = 0x10;
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/**
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* YCrCb format used for images, which uses the NV21 encoding format. This
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* is the default format for camera preview images, when not otherwise set
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* with {@link android.hardware.Camera.Parameters#setPreviewFormat(int)}.
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*/
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public static final int NV21 = 0x11;
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/**
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* YCbCr format used for images, which uses YUYV (YUY2) encoding format.
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* This is an alternative format for camera preview images. Whether this
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* format is supported by the camera hardware can be determined by
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* {@link android.hardware.Camera.Parameters#getSupportedPreviewFormats()}.
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*/
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public static final int YUY2 = 0x14;
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/**
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* Encoded formats. These are not necessarily supported by the hardware.
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*/
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public static final int JPEG = 0x100;
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/**
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* <p>Multi-plane Android YUV format</p>
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*
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* <p>This format is a generic YCbCr format, capable of describing any 4:2:0
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* chroma-subsampled planar or semiplanar buffer (but not fully interleaved),
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* with 8 bits per color sample.</p>
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*
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* <p>Images in this format are always represented by three separate buffers
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* of data, one for each color plane. Additional information always
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* accompanies the buffers, describing the row stride and the pixel stride
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* for each plane.</p>
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*
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* <p>The order of planes in the array returned by
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* {@link android.media.Image#getPlanes() Image#getPlanes()} is guaranteed such that
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* plane #0 is always Y, plane #1 is always U (Cb), and plane #2 is always V (Cr).</p>
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*
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* <p>The Y-plane is guaranteed not to be interleaved with the U/V planes
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* (in particular, pixel stride is always 1 in
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* {@link android.media.Image.Plane#getPixelStride() yPlane.getPixelStride()}).</p>
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*
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* <p>The U/V planes are guaranteed to have the same row stride and pixel stride
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* (in particular,
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* {@link android.media.Image.Plane#getRowStride() uPlane.getRowStride()}
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* == {@link android.media.Image.Plane#getRowStride() vPlane.getRowStride()} and
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* {@link android.media.Image.Plane#getPixelStride() uPlane.getPixelStride()}
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* == {@link android.media.Image.Plane#getPixelStride() vPlane.getPixelStride()};
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* ).</p>
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*
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* @see android.media.Image
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* @see android.media.ImageReader
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* @see android.hardware.camera2.CameraDevice
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*/
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public static final int YUV_420_888 = 0x23;
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/**
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* <p>General raw camera sensor image format, usually representing a
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* single-channel Bayer-mosaic image. Each pixel color sample is stored with
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* 16 bits of precision.</p>
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*
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* <p>The layout of the color mosaic, the maximum and minimum encoding
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* values of the raw pixel data, the color space of the image, and all other
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* needed information to interpret a raw sensor image must be queried from
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* the {@link android.hardware.camera2.CameraDevice} which produced the
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* image.</p>
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*
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* @hide
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*/
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public static final int RAW_SENSOR = 0x20;
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/**
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* Raw bayer format used for images, which is 10 bit precision samples
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* stored in 16 bit words. The filter pattern is RGGB. Whether this format
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* is supported by the camera hardware can be determined by
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* {@link android.hardware.Camera.Parameters#getSupportedPreviewFormats()}.
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*
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* @hide
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*/
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public static final int BAYER_RGGB = 0x200;
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/**
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* Use this function to retrieve the number of bits per pixel of an
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* ImageFormat.
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*
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* @param format
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* @return the number of bits per pixel of the given format or -1 if the
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* format doesn't exist or is not supported.
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*/
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public static int getBitsPerPixel(int format) {
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switch (format) {
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case RGB_565:
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return 16;
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case NV16:
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return 16;
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case YUY2:
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return 16;
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case YV12:
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return 12;
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case Y8:
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return 8;
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case Y16:
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return 16;
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case NV21:
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return 12;
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case YUV_420_888:
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return 12;
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case RAW_SENSOR:
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return 16;
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case BAYER_RGGB:
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return 16;
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}
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return -1;
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}
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}
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