android采集视频格式转换算法

落日映苍穹つ 2022-06-15 07:48 253阅读 0赞

//-----------下面是常用的格式转换方法-----------------------------
    
        //yv12 转 yuv420p  yvu -> yuv,yuv420p就是I420格式，使用极其广泛
        private void swapYV12toI420(byte[] yv12bytes, byte[] i420bytes, int width, int height) {
            System.arraycopy(yv12bytes, 0, i420bytes, 0, width * height);
            System.arraycopy(yv12bytes, width * height + width * height / 4, i420bytes, width * height, width * height / 4);
            System.arraycopy(yv12bytes, width * height, i420bytes, width * height + width * height / 4, width * height / 4);
        }
    
        //选择了YUV420SP作为编码的目标颜色空间，其实YUV420SP就是NV12，咱们CAMERA设置的是NV21，所以需要转一下
        private void NV21ToNV12(byte[] nv21, byte[] nv12, int width, int height) {
            if (nv21 == null || nv12 == null) return;
            int framesize = width * height;
            int i = 0, j = 0;
            System.arraycopy(nv21, 0, nv12, 0, framesize);
            for (i = 0; i < framesize; i++) {
                nv12[i] = nv21[i];
            }
            for (j = 0; j < framesize / 2; j += 2) {
                nv12[framesize + j - 1] = nv21[j + framesize];
            }
            for (j = 0; j < framesize / 2; j += 2) {
                nv12[framesize + j] = nv21[j + framesize - 1];
            }
        }
    
        private void swapYV12toNV12(byte[] yv12bytes, byte[] nv12bytes, int width, int height) {
    
            int nLenY = width * height;
            int nLenU = nLenY / 4;
            System.arraycopy(yv12bytes, 0, nv12bytes, 0, width * height);
    //        for (int i = 0; i < nLenU; i++) {
    //            nv12bytes[nLenY + 2 * i] = yv12bytes[nLenY + i];
    //            nv12bytes[nLenY + 2 * i + 1] = yv12bytes[nLenY + nLenU + i];
    //        }
            for (int i = 0; i < nLenU; i++) {
                nv12bytes[nLenY + 2 * i + 1] = yv12bytes[nLenY + i];
                nv12bytes[nLenY + 2 * i] = yv12bytes[nLenY + nLenU + i];
            }
        }
    
        private void swapNV12toI420(byte[] nv12bytes, byte[] i420bytes, int width, int height) {
    
            int nLenY = width * height;
            int nLenU = nLenY / 4;
            System.arraycopy(nv12bytes, 0, i420bytes, 0, width * height);
            for (int i = 0; i < nLenU; i++) {
                i420bytes[nLenY + i] = nv12bytes[nLenY + 2 * i + 1];
                i420bytes[nLenY + nLenU + i] = nv12bytes[nLenY + 2 * i];
            }
        }
    
        public Bitmap rawByteArray2RGBABitmap2(byte[] data, int width, int height) {
            int frameSize = width * height;
            int[] rgba = new int[frameSize];
    
            for (int i = 0; i < height; i++)
                for (int j = 0; j < width; j++) {
                    int y = (0xff & ((int) data[i * width + j]));
                    int u = (0xff & ((int) data[frameSize + (i >> 1) * width + (j & ~1) + 0]));
                    int v = (0xff & ((int) data[frameSize + (i >> 1) * width + (j & ~1) + 1]));
                    y = y < 16 ? 16 : y;
    
                    int r = Math.round(1.164f * (y - 16) + 1.596f * (v - 128));
                    int g = Math.round(1.164f * (y - 16) - 0.813f * (v - 128) - 0.391f * (u - 128));
                    int b = Math.round(1.164f * (y - 16) + 2.018f * (u - 128));
    
                    r = r < 0 ? 0 : (r > 255 ? 255 : r);
                    g = g < 0 ? 0 : (g > 255 ? 255 : g);
                    b = b < 0 ? 0 : (b > 255 ? 255 : b);
    
                    rgba[i * width + j] = 0xff000000 + (b << 16) + (g << 8) + r;
                }
    
            Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
            bmp.setPixels(rgba, 0, width, 0, 0, width, height);
            return bmp;
        }