Camera預覽時需要對yuv幀做水平翻轉處理，直接在onPreviewFrame(byte[] data, Camera camera)里調用Mirror函數，處理完后的圖片和預覽效果成水平翻轉關系。
nv21的鏡像算法：
private void Mirror(byte[] src, int w, int h) { //src是原始yuv數組 int i; int index; byte temp; int a, b; //mirror y for (i = 0; i < h; i++) { a = i * w; b = (i + 1) * w - 1; while (a < b) { temp = src[a]; src[a] = src[b]; src[b] = temp; a++; b--; } } // mirror u and v index = w * h; for (i = 0; i < h / 2; i++) { a = i * w; b = (i + 1) * w - 2; while (a < b) { temp = src[a + index]; src[a + index] = src[b + index]; src[b + index] = temp; temp = src[a + index + 1]; src[a + index + 1] = src[b + index + 1]; src[b + index + 1] = temp; a+=2; b-=2; } } }i420的鏡像算法：
private void Mirror(byte[] src, int w, int h) { //src是原始yuv數組 int i; int index; byte temp; int a, b; //mirror y for (i = 0; i < h; i++) { a = i * w; b = (i + 1) * w - 1; while (a < b) { temp = src[a]; src[a] = src[b]; src[b] = temp; a++; b--; } } //mirror u index = w * h;//U起始位置 for (i = 0; i < h / 2; i++) { a = i * w / 2; b = (i + 1) * w / 2 - 1; while (a < b) { temp = src[a + index]; src[a + index] = src[b + index]; src[b + index] = temp; a++; b--; } } //mirror v index = w * h / 4 * 5;//V起始位置 for (i = 0; i < h / 2; i++) { a = i * w / 2; b = (i + 1) * w / 2 - 1; while (a < b) { temp = src[a + index]; src[a + index] = src[b + index]; src[b + index] = temp; a++; b--; } }I420，YV12，NV12，NV21均屬于YUV420，以下為四種格式的排列順序：
I420: YYYYYYYY UUVV =>YUV420P
YV12: YYYYYYYY VVUU =>YUV420P
NV12: YYYYYYYY UVUV =>YUV420SP
NV21: YYYYYYYY VUVU =>YUV420SP
以上這篇android camera yuv幀水平翻轉實例就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持武林網。
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