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基于 libyuv 封装各种图像格式转换,用于处理摄像头yuv图像数据

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LQRLibyuv

《Android 音视频——Libyuv 使用实战》。该库对 libyuv 进行封装,用于处理摄像头 yuv 图像数据。

该库已发布 jitpack ,最新版本号为 JitPack,可直接通过 gradle 依赖使用:

implementation 'com.github.GitLqr:LQRLibyuv:1.0.0'

注:因为 jitpack 只支持使用高版本 NDK 编译(22.1.7171670),无法编译出已经淘汰的 armeabi 与 mips 架构的 so 库,所以如果有需要,请 clone 该仓库,改用低版本的 NDK 自己本地编译吧,gradle 里都写好了。

一、编译

Rebuild Project后,提取 so 库与 YuvUtil.java,放到自己的工程项目中,如下图所示:

二、使用

1、使用 YuvUtil 完全手动处理 YUV 图像数据

/**
 * 使用YuvUtil完全手动处理YUV图像数据,要求理解byte[]的创建长度:
 * yuvNV21ToI420():nv21转i420
 * yuvMirrorI420():镜像
 * yuvScaleI420():缩放
 * yuvCropI420():裁剪
 * yuvRotateI420():旋转
 * yuvI420ToNV21():i420转nv21
 *
 * @param data 摄像头获取到的nv21数据
 */
private void yuvProcessAndDraw1(byte[] data) {
    int width = WIDTH;
    int height = HEIGHT;

    // nv21 --> i420
    byte[] nv21Data = data;
    byte[] i420Data = new byte[width * height * 3 / 2];
    YuvUtil.yuvNV21ToI420(nv21Data, width, height, i420Data);

    // 镜像
    byte[] i420MirrorData = new byte[width * height * 3 / 2];
    YuvUtil.yuvMirrorI420(i420Data, width, height, i420MirrorData);
    i420Data = i420MirrorData;

    // 缩放
    byte[] i420ScaleData = new byte[width * height * 3 / 2];
    int scaleWidth = 320;
    int scaleHeight = 240;
    YuvUtil.yuvScaleI420(i420Data, width, height, i420ScaleData, scaleWidth, scaleHeight, 0);
    i420Data = i420ScaleData;
    width = scaleWidth;
    height = scaleHeight;

    // 裁剪
    byte[] i420CropData = new byte[width * height * 3 / 2];
    int cropWidth = 240;
    int cropHeight = 240;
    YuvUtil.yuvCropI420(i420Data, width, height, i420CropData, cropWidth, cropHeight, 0, 0);
    i420Data = i420CropData;
    width = cropWidth;
    height = cropHeight;

    // 旋转
    byte[] i420RotateData = new byte[width * height * 3 / 2];
    int degree = 90;
    YuvUtil.yuvRotateI420(i420Data, width, height, i420RotateData, degree);
    i420Data = i420RotateData;
    if (degree == 90 || degree == 270) {
        int temp = width;
        width = height;
        height = temp;
    }

    // i420 --> nv21
    YuvUtil.yuvI420ToNV21(i420Data, width, height, nv21Data);

    // 绘制图像
    drawSurfaceView(data, width, height);
}

2、使用 YuvUtil 半自动处理 YUV 图像数据

/**
 * 使用YuvUtil半自动处理YUV图像数据:
 * yuvCompress():nv21转i420、镜像、缩放、旋转
 * yuvCropI420():裁剪
 * yuvI420ToNV21():i420转nv21
 *
 * @param data 摄像头获取到的nv21数据
 */
private void yuvProcessAndDraw2(byte[] data) {
    int width = WIDTH;
    int height = HEIGHT;
    int dstWidth = 320;
    int dstHeight = 240;

    // nv21 --> i420 --> 镜像 --> 缩放 --> 旋转
    byte[] nv21Data = data;
    byte[] i420Data = new byte[dstWidth * dstHeight * 3 / 2];
    int degree = 90;
    YuvUtil.yuvCompress(nv21Data, width, height, i420Data, dstWidth, dstHeight, 0, 90, true);
    // 旋转过后,需要手动校正宽高
    if (degree == 90 || degree == 270) {
        width = dstHeight;
        height = dstWidth;
    } else {
        width = dstWidth;
        height = dstHeight;
    }

    // 裁剪
    byte[] i420CropData = new byte[width * height * 3 / 2];
    int cropWidth = 240;
    int cropHeight = 240;
    YuvUtil.yuvCropI420(i420Data, width, height, i420CropData, cropWidth, cropHeight, 0, 0);
    i420Data = i420CropData;
    width = cropWidth;
    height = cropHeight;

    // i420 --> nv21
    YuvUtil.yuvI420ToNV21(i420Data, width, height, nv21Data);

    // 绘制图像
    drawSurfaceView(data, width, height);
}

3、Yuv 转 Bitmap

/**
 * 使用SurfaceView绘制Bitmap图像
 * @param data nv21数据
 * @param width 图像宽
 * @param height 图像高
 */
private void drawSurfaceView(byte[] data, int width, int height) {
    YuvImage yuvImage = new YuvImage(data, ImageFormat.NV21, width, height, null);
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    yuvImage.compressToJpeg(new Rect(0, 0, width, height), 100, out);
    byte[] bytes = out.toByteArray();
    Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
    mCameraViewR.drawBitmap(bitmap);
}

三、声明

文章:《Android 音视频——Libyuv 使用实战》
感谢:该库基于LibyuvDemo,修复了 bug,并添加了一些新 api,感谢原作者的开源。

四、更新

2019-11-06 扩展 yuv 图像转换 API:

  • YuvUtil#yuvNV21ToI420AndRotate(byte[] nv21Src, int width, int height, byte[] i420Dst, int degree);
  • YuvUtil#yuvI420ToRGB24(byte[] i420Src, int width, int height, byte[] rgb24Dst);
  • YuvUtil#yuvI420ToARGB(byte[] i420Src, int width, int height, int dst_stride, byte[] argbDst);
  • YuvUtil#yuvI420ToRGBAMac(byte[] i420Src, int width, int height, int dst_stride, byte[] rgbaMacDst);
  • YuvUtil#yuvI420ToARGB4444(byte[] i420Src, int width, int height, int dst_stride, byte[] argb4444Dst);
  • YuvUtil#yuvI420ToRGB565(byte[] i420Src, int width, int height, byte[] rgb565Dst);
  • YuvUtil#yuvI420ToRGB565Android(byte[] i420Src, int width, int height, byte[] rgb565Dst);
  • YuvUtil#yuvI420ToARGB1555(byte[] i420Src, int width, int height, int dst_stride, byte[] argb1555Dst);
  • YuvUtil#yuvI420ToYUY2(byte[] i420Src, int width, int height, int dst_stride, byte[] yuy2Dst);
  • YuvUtil#yuvI420ToUYVY(byte[] i420Src, int width, int height, int dst_stride, byte[] uyvyDst);
  • YuvUtil#yuvI420ToYV12(byte[] i420Src, int width, int height, int dst_stride, byte[] yv12Dst);
  • YuvUtil#yuvYV12ToI420(byte[] yv12Src, int width, int height, byte[] i420Dst);
  • YuvUtil#yuvNV12ToI420(byte[] nv12Src, int width, int height, byte[] i420Dst);
  • YuvUtil#yuvI420ToNv12(byte[] i420Src, int width, int height, byte[] nv12Dst);
  • YuvUtil#yuvNV12ToI420AndRotate(byte[] nv12Src, int width, int height, byte[] i420Dst, int degree);
  • YuvUtil#yuvNV12ToRGB565(byte[] nv12Src, int width, int height, byte[] rgb565Dst);
  • YuvUtil#yuvI420ToRGBAIPhone(byte[] i420Src, int width, int height, int dst_stride, byte[] rgbaDst);
  • YuvUtil#yuvI420Copy(byte[] i420Src, int width, int height, int dst_stride, byte[] i420Dst);
  • YuvUtil#yuvUYVYToI420(byte[] uyvySrc, int width, int height, byte[] i420Dst);
  • YuvUtil#yuvYUY2ToI420(byte[] yuy2Src, int width, int height, byte[] i420Dst);
  • YuvUtil#yuvRGB24ToARGB(byte[] rgb24Src, int width, int height, int dst_stride, byte[] argbDst);
  • YuvUtil#yuvRGB24ToI420(byte[] rgb24Src, int width, int height, byte[] i420Dst);
  • YuvUtil#yuvI420ToARGBMac(byte[] i420Src, int width, int height, int dst_stride, byte[] argbMacDst);
  • YuvUtil#yuvARGBMacToI420(byte[] argbMacSrc, int width, int height, byte[] i420Dst);
  • YuvUtil#yuvMirrorI420LeftRight(byte[] i420Src, int width, int height, byte[] i420Dst);
  • YuvUtil#yuvMirrorI420UpDown(byte[] i420Src, int width, int height, byte[] i420Dst);

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基于 libyuv 封装各种图像格式转换,用于处理摄像头yuv图像数据

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