package com.frank.live.util; /** * Tool of transforming YUV format * Created by frank on 2018/7/1. */ public class YUVUtil { public static void rgbaToYUV420p(int[] argb, byte[] yuv, int width, int height) { final int frameSize = width * height; int index = 0; int yIndex = 0; int uIndex = frameSize; int vIndex = frameSize * 5 / 4; int R, G, B, Y, U, V; for (int j = 0; j < height; j++) { for (int i = 0; i < width; i++) { R = (argb[index] & 0xff0000) >> 16; G = (argb[index] & 0xff00) >> 8; B = (argb[index] & 0xff); // RGB to YUV algorithm Y = ((66 * R + 129 * G + 25 * B + 128) >> 8) + 16; // I420(YUV420p) -> YYYYYYYY UU VV yuv[yIndex++] = (byte) Y; if (j % 2 == 0 && i % 2 == 0) { U = ((-38 * R - 74 * G + 112 * B + 128) >> 8) + 128; V = ((112 * R - 94 * G - 18 * B + 128) >> 8) + 128; yuv[uIndex++] = (byte) U; yuv[vIndex++] = (byte) V; } index++; } } } private static int yuv2argb(int y, int u, int v) { int r, g, b; r = y + (int) (1.402f * u); g = y - (int) (0.344f * v + 0.714f * u); b = y + (int) (1.772f * v); r = r > 255 ? 255 : Math.max(r, 0); g = g > 255 ? 255 : Math.max(g, 0); b = b > 255 ? 255 : Math.max(b, 0); return 0xff000000 | (r << 16) | (g << 8) | b; } private static void yuv420pToARGB(byte[] yuv, int[] argb, int width, int height) { int size = width * height; int offset = size; int u, v, y1, y2, y3, y4; for (int i = 0, k = 0; i < size; i += 2, k += 2) { y1 = yuv[i] & 0xff; y2 = yuv[i + 1] & 0xff; y3 = yuv[width + i] & 0xff; y4 = yuv[width + i + 1] & 0xff; u = yuv[offset + k] & 0xff; v = yuv[offset + k + 1] & 0xff; u = u - 128; v = v - 128; argb[i] = yuv2argb(y1, u, v); argb[i + 1] = yuv2argb(y2, u, v); argb[width + i] = yuv2argb(y3, u, v); argb[width + i + 1] = yuv2argb(y4, u, v); if (i != 0 && (i + 2) % width == 0) i += width; } } public static void YUV420pRotate90(byte[] dst, byte[] src, int width, int height) { int n = 0; int wh = width * height; int halfWidth = width / 2; int halfHeight = height / 2; // y for (int j = 0; j < width; j++) { for (int i = height - 1; i >= 0; i--) { dst[n++] = src[width * i + j]; } } // u for (int i = 0; i < halfWidth; i++) { for (int j = 1; j <= halfHeight; j++) { dst[n++] = src[wh + ((halfHeight - j) * halfWidth + i)]; } } // v for (int i = 0; i < halfWidth; i++) { for (int j = 1; j <= halfHeight; j++) { dst[n++] = src[wh + wh / 4 + ((halfHeight - j) * halfWidth + i)]; } } } public static void YUV420pRotate180(byte[] dst, byte[] src, int width, int height) { int n = 0; int halfWidth = width / 2; int halfHeight = height / 2; // y for (int j = height - 1; j >= 0; j--) { for (int i = width; i > 0; i--) { dst[n++] = src[width * j + i - 1]; } } // u int offset = width * height; for (int j = halfHeight - 1; j >= 0; j--) { for (int i = halfWidth; i > 0; i--) { dst[n++] = src[offset + halfWidth * j + i - 1]; } } // v offset += halfWidth * halfHeight; for (int j = halfHeight - 1; j >= 0; j--) { for (int i = halfWidth; i > 0; i--) { dst[n++] = src[offset + halfWidth * j + i - 1]; } } } public static void flipYUV(byte[] dst, byte[] src, int width, int height) { if (dst == null || width <= 0 || height <= 0) return; int idx = 0; // Y for (int i = 0; i < width; i++) { for (int j = 0; j < height; j++) { dst[idx++] = src[width - i + (height - j) * width]; } } // U int offset = width * height; for (int i = 0; i < width / 2; i++) { for (int j = 0; j < height / 2; j++) { dst[idx++] = src[offset + width - i + (height / 2 - j) * width / 2]; } } // V offset += width * height / 4; for (int i = 0; i < width / 2; i++) { for (int j = 0; j < height / 2; j++) { dst[idx++] = src[offset + width - i + (height / 2 - j) * width / 2]; } } } }