android camera yuv帧水平翻转 android camera yuv帧水平翻转实例
TedSmile 人气:0Camera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
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