Camera预览时需要对yuv帧做水平翻转处理，直接在onPreviewFrame(byte[] data, Camera camera)里调用Mirror函数，处理完后的图片和预览效果成水平翻转关系。

nv21的镜像算法：

private void Mirror(byte[] src, int w, int h) { //src是原始yuv数组 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的镜像算法：

private void Mirror(byte[] src, int w, int h) { //src是原始yuv数组 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均属于YUV420，以下为四种格式的排列顺序：

I420: YYYYYYYY UUVV =>YUV420P
YV12: YYYYYYYY VVUU =>YUV420P
NV12: YYYYYYYY UVUV =>YUV420SP
NV21: YYYYYYYY VUVU =>YUV420SP

以上这篇android camera yuv帧水平翻转实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。