android采集的视频进行旋转

来源：互联网发布：红楼梦知乎编辑：程序博客网时间：2024/06/07 00:56

最近在做android视频实时采集，由于android摄像头默认是旋转90度的，所以采集到的视频会有一些问题，因此在采集到数据帧之后，首先需要在onPreviewFrame方法中对yuv格式的原始帧进行一次旋转。

参考了http://stackoverflow.com/questions/14167976/rotate-an-yuv-byte-array-on-android

以下为旋转90度的代码

<span style="white-space: pre;"></span>private byte[] rotateYUV420Degree90(byte[] data, int imageWidth,<span style="white-space: pre;"></span>int imageHeight) {<span style="white-space: pre;"></span>byte[] yuv = new byte[imageWidth * imageHeight * 3 / 2];<span style="white-space: pre;"></span>// 旋转Y int i = 0;<span style="white-space: pre;"></span>for (int x = 0; x < imageWidth; x++) {<span style="white-space: pre;"></span>for (int y = imageHeight - 1; y >= 0; y--) {<span style="white-space: pre;"></span>yuv[i] = data[y * imageWidth + x];<span style="white-space: pre;"></span>i++;<span style="white-space: pre;"></span>}<span style="white-space: pre;"></span>}<span style="white-space: pre;"></span>// 旋转U和V<span style="white-space: pre;"></span>i = imageWidth * imageHeight * 3 / 2 - 1;<span style="white-space: pre;"></span>for (int x = imageWidth - 1; x > 0; x = x - 2) {<span style="white-space: pre;"></span>for (int y = 0; y < imageHeight / 2; y++) {<span style="white-space: pre;"></span>yuv[i] = data[(imageWidth * imageHeight) + (y * imageWidth) + x];<span style="white-space: pre;"></span>i--;<span style="white-space: pre;"></span>yuv[i] = data[(imageWidth * imageHeight) + (y * imageWidth)<span style="white-space: pre;"></span>+ (x - 1)];<span style="white-space: pre;"></span>i--;<span style="white-space: pre;"></span>}<span style="white-space: pre;"></span>}<span style="white-space: pre;"></span>return yuv;<span style="white-space: pre;"></span>}

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