1/* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.graphics; 18 19public class ImageFormat { 20 /* 21 * these constants are chosen to be binary compatible with their previous 22 * location in PixelFormat.java 23 */ 24 25 public static final int UNKNOWN = 0; 26 27 /** 28 * RGB format used for pictures encoded as RGB_565 see 29 * {@link android.hardware.Camera.Parameters#setPictureFormat(int)}. 30 */ 31 public static final int RGB_565 = 4; 32 33 /** 34 * Android YUV format: 35 * 36 * This format is exposed to software decoders and applications. 37 * 38 * YV12 is a 4:2:0 YCrCb planar format comprised of a WxH Y plane followed 39 * by (W/2) x (H/2) Cr and Cb planes. 40 * 41 * This format assumes 42 * - an even width 43 * - an even height 44 * - a horizontal stride multiple of 16 pixels 45 * - a vertical stride equal to the height 46 * 47 * y_size = stride * height 48 * c_size = ALIGN(stride/2, 16) * height/2 49 * size = y_size + c_size * 2 50 * cr_offset = y_size 51 * cb_offset = y_size + c_size 52 * 53 * Whether this format is supported by the camera hardware can be determined 54 * by 55 * {@link android.hardware.Camera.Parameters#getSupportedPreviewFormats()}. 56 */ 57 public static final int YV12 = 0x32315659; 58 59 /** 60 * YCbCr format, used for video. Whether this format is supported by the 61 * camera hardware can be determined by 62 * {@link android.hardware.Camera.Parameters#getSupportedPreviewFormats()}. 63 */ 64 public static final int NV16 = 0x10; 65 66 /** 67 * YCrCb format used for images, which uses the NV21 encoding format. This 68 * is the default format for camera preview images, when not otherwise set 69 * with {@link android.hardware.Camera.Parameters#setPreviewFormat(int)}. 70 */ 71 public static final int NV21 = 0x11; 72 73 /** 74 * YCbCr format used for images, which uses YUYV (YUY2) encoding format. 75 * This is an alternative format for camera preview images. Whether this 76 * format is supported by the camera hardware can be determined by 77 * {@link android.hardware.Camera.Parameters#getSupportedPreviewFormats()}. 78 */ 79 public static final int YUY2 = 0x14; 80 81 /** 82 * Encoded formats. These are not necessarily supported by the hardware. 83 */ 84 public static final int JPEG = 0x100; 85 86 /** 87 * Raw bayer format used for images, which is 10 bit precision samples 88 * stored in 16 bit words. The filter pattern is RGGB. Whether this format 89 * is supported by the camera hardware can be determined by 90 * {@link android.hardware.Camera.Parameters#getSupportedPreviewFormats()}. 91 * 92 * @hide 93 */ 94 public static final int BAYER_RGGB = 0x200; 95 96 /** 97 * Use this function to retrieve the number of bits per pixel of an 98 * ImageFormat. 99 * 100 * @param format 101 * @return the number of bits per pixel of the given format or -1 if the 102 * format doesn't exist or is not supported. 103 */ 104 public static int getBitsPerPixel(int format) { 105 switch (format) { 106 case RGB_565: 107 return 16; 108 case NV16: 109 return 16; 110 case YUY2: 111 return 16; 112 case YV12: 113 return 12; 114 case NV21: 115 return 12; 116 case BAYER_RGGB: 117 return 16; 118 } 119 return -1; 120 } 121} 122