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