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FFmpegAndroid/Live/src/main/java/com/frank/live/util/YUVUtil.java

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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];
}
}
}
}