请教 yv12 转 RGB 的问题

2004-08-20 11:49:08 438 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

yuv420 yv12 与RGB转换算法 bool YV12_to_RGB24(unsigned char* pYV12, unsigned char* pRGB24, int iWidth, int iHeight) { if(!pYV12 || !pRGB24) return false; const long nYLen = long(iHeight * iWidth); const int nHfWidth = 阅读详情

我在网上找到如下 source

void
yv12_to_rgb24_c(uint8_t * dst,
int dst_stride,
uint8_t * y_src,
uint8_t * u_src,
uint8_t * v_src,
int y_stride,
int uv_stride,
int width,
int height)
{
const uint32_t dst_dif = 6 * dst_stride - 3 * width;
int32_t y_dif = 2 * y_stride - width;

uint8_t *dst2 = dst + 3 * dst_stride;
uint8_t *y_src2 = y_src + y_stride;
uint32_t x, y;

if (height < 0) { /* flip image? */
height = -height;
y_src += (height - 1) * y_stride;
y_src2 = y_src - y_stride;
u_src += (height / 2 - 1) * uv_stride;
v_src += (height / 2 - 1) * uv_stride;
y_dif = -width - 2 * y_stride;
uv_stride = -uv_stride;
}

for (y = height / 2; y; y--) {
/* process one 2x2 block per iteration */
for (x = 0; x < (uint32_t) width / 2; x++) {
int u, v;
int b_u, g_uv, r_v, rgb_y;
int r, g, b;

u = u_src[x];
v = v_src[x];

b_u = B_U_tab[u];
g_uv = G_U_tab[u] + G_V_tab[v];
r_v = R_V_tab[v];

rgb_y = RGB_Y_tab[*y_src];
b = (rgb_y + b_u) >> SCALEBITS_OUT;
g = (rgb_y - g_uv) >> SCALEBITS_OUT;
r = (rgb_y + r_v) >> SCALEBITS_OUT;
dst[0] = MAX(0, MIN(255, b));
dst[1] = MAX(0, MIN(255, g));
dst[2] = MAX(0, MIN(255, r));

y_src++;
rgb_y = RGB_Y_tab[*y_src];
b = (rgb_y + b_u) >> SCALEBITS_OUT;
g = (rgb_y - g_uv) >> SCALEBITS_OUT;
r = (rgb_y + r_v) >> SCALEBITS_OUT;
dst[3] = MAX(0, MIN(255, b));
dst[4] = MAX(0, MIN(255, g));
dst[5] = MAX(0, MIN(255, r));
y_src++;

rgb_y = RGB_Y_tab[*y_src2];
b = (rgb_y + b_u) >> SCALEBITS_OUT;
g = (rgb_y - g_uv) >> SCALEBITS_OUT;
r = (rgb_y + r_v) >> SCALEBITS_OUT;
dst2[0] = MAX(0, MIN(255, b));
dst2[1] = MAX(0, MIN(255, g));
dst2[2] = MAX(0, MIN(255, r));
y_src2++;

rgb_y = RGB_Y_tab[*y_src2];
b = (rgb_y + b_u) >> SCALEBITS_OUT;
g = (rgb_y - g_uv) >> SCALEBITS_OUT;
r = (rgb_y + r_v) >> SCALEBITS_OUT;
dst2[3] = MAX(0, MIN(255, b));
dst2[4] = MAX(0, MIN(255, g));
dst2[5] = MAX(0, MIN(255, r));
y_src2++;

dst += 6;
dst2 += 6;
}

dst += dst_dif;
dst2 += dst_dif;

y_src += y_dif;
y_src2 += y_dif;

u_src += uv_stride;
v_src += uv_stride;
}
}

但是我现在只有每一帧 yv12 (Planar 4:2:0) 的
BYTE *pBuf ：图像的数据缓存
LONG dwSize ：图像缓存大小
LONG dwWidth ：图像宽度
LONG dwHeight ：图像高度
如何得到上述函数的其他参数
int dst_stride,
uint8_t * y_src,
uint8_t * u_src,
uint8_t * v_src,
int y_stride,
int uv_stride

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