这两天等待应聘的offer,闲着无聊，回忆起1年多以前做的东西，mpeg4标准的rtp流，收到后在本地回放
我使用的是ddraw来显示，1开始为了先显示出东西进行调试，并且当时重点在同步以及接受流，所以当时用了yuv2bmp
这个东西;把yv12转换成了bmp,然后1桢1桢贴到窗口dc上。呵呵，效果可想；） 经过了矩阵转换又是draw->dc
后来项目进入优化阶段，决定用ddraw的overlay来显示yv12视频。具体的方法就是参照Dxsdk7里的“蚊子”程序。
把yv12直接传到overlay显示. ;)
蚊子现实的是yuv422，和yv12相比较，在逐行memcpy到pSurf的时候排列不同而已，具体参照yuv标准就行了
(简介ddraw的实用，dxsdk7是ddraw的最后版本了)
yuv2bmp的实现:
void yuv2rgb_32(uint8_t *puc_y, int stride_y,
uint8_t *puc_u, uint8_t *puc_v, int stride_uv,
uint8_t *puc_out, int width_y, int height_y,
unsigned int _stride_out)
{
/* int x, y;
int stride_diff = 4 * (_stride_out - width_y);
if (height_y < 0) {
// we are flipping our output upside-down
height_y = -height_y;
puc_y += (height_y - 1) * stride_y ;
puc_u += (height_y/2 - 1) * stride_uv;
puc_v += (height_y/2 - 1) * stride_uv;
stride_y = -stride_y;
stride_uv = -stride_uv;
}
for (y=0; y<height_y; y++)
{
for (x=0; x<width_y; x++)
{
signed int _r,_g,_b;
signed int r, g, b;
signed int y, u, v;
y = puc_y[x] +10;//- 16;
u = puc_u[x>>1]-128;
v = puc_v[x>>1]-128;
_r = _R(y,u,v);
_g = _G(y,u,v);
_b = _B(y,u,v);
r = _S(_r);
g = _S(_g);
b = _S(_b);
puc_out[0] = r;
puc_out[1] = g;
puc_out[2] = b;
puc_out[3] = 0;
puc_out+=4;
}
puc_y += stride_y;
if (y%2) {
puc_u += stride_uv;
puc_v += stride_uv;
}
puc_out += stride_diff;
}*/
///////////// Intel MMX ///////////////
int y, horiz_count;
int stride_out = width_y <<2;
if (height_y < 0) {
// we are flipping our output upside-down
height_y = -height_y;
puc_y += (height_y - 1) * stride_y ;
puc_u += ((height_y>>1) - 1) * stride_uv;
puc_v += ((height_y>>1) - 1) * stride_uv;
stride_y = -stride_y;
stride_uv = -stride_uv;
}
horiz_count = -(width_y >> 3);
for (y=0; y<height_y; y++) {
_asm {
push eax
push ebx
push ecx
push edx
push edi
mov eax, puc_out
mov ebx, puc_y
mov ecx, puc_u
mov edx, puc_v
mov edi, horiz_count
horiz_loop:
movd mm2, [ecx]
pxor mm7, mm7
movd mm3, [edx]
punpcklbw mm2, mm7 ; mm2 = __u3__u2__u1__u0
movq mm0, [ebx] ; mm0 = y7y6y5y4y3y2y1y0
punpcklbw mm3, mm7 ; mm3 = __v3__v2__v1__v0
movq mm1, mmw_0x00ff ; mm1 = 00ff00ff00ff00ff
psubusb mm0, mmb_0x10 ; mm0 -= 16
psubw mm2, mmw_0x0080 ; mm2 -= 128
pand mm1, mm0 ; mm1 = __y6__y4__y2__y0
psubw mm3, mmw_0x0080 ; mm3 -= 128
psllw mm1, 3 ; mm1 *= 8
psrlw mm0, 8 ; mm0 = __y7__y5__y3__y1
psllw mm2, 3 ; mm2 *= 8
pmulhw mm1, mmw_mult_Y ; mm1 *= luma coeff
psllw mm0, 3 ; mm0 *= 8
psllw mm3, 3 ; mm3 *= 8
movq mm5, mm3 ; mm5 = mm3 = v
pmulhw mm5, mmw_mult_V_R ; mm5 = red chroma
movq mm4, mm2 ; mm4 = mm2 = u
pmulhw mm0, mmw_mult_Y ; mm0 *= luma coeff
movq mm7, mm1 ; even luma part
pmulhw mm2, mmw_mult_U_G ; mm2 *= u green coeff
paddsw mm7, mm5 ; mm7 = luma + chroma __r6__r4__r2__r0
pmulhw mm3, mmw_mult_V_G ; mm3 *= v green coeff
packuswb mm7, mm7 ; mm7 = r6r4r2r0r6r4r2r0
pmulhw mm4, mmw_mult_U_B ; mm4 = blue chroma
paddsw mm5, mm0 ; mm5 = luma + chroma __r7__r5__r3__r1
packuswb mm5, mm5 ; mm6 = r7r5r3r1r7r5r3r1
paddsw mm2, mm3 ; mm2 = green chroma
movq mm3, mm1 ; mm3 = __y6__y4__y2__y0
movq mm6, mm1 ; mm6 = __y6__y4__y2__y0
paddsw mm3, mm4 ; mm3 = luma + chroma __b6__b4__b2__b0
paddsw mm6, mm2 ; mm6 = luma + chroma __g6__g4__g2__g0
punpcklbw mm7, mm5 ; mm7 = r7r6r5r4r3r2r1r0
paddsw mm2, mm0 ; odd luma part plus chroma part __g7__g5__g3__g1
packuswb mm6, mm6 ; mm2 = g6g4g2g0g6g4g2g0
packuswb mm2, mm2 ; mm2 = g7g5g3g1g7g5g3g1
packuswb mm3, mm3 ; mm3 = b6b4b2b0b6b4b2b0
paddsw mm4, mm0 ; odd luma part plus chroma part __b7__b5__b3__b1
packuswb mm4, mm4 ; mm4 = b7b5b3b1b7b5b3b1
punpcklbw mm6, mm2 ; mm6 = g7g6g5g4g3g2g1g0
punpcklbw mm3, mm4 ; mm3 = b7b6b5b4b3b2b1b0
// 32-bit shuffle....
pxor mm0, mm0 ; is this needed?
movq mm1, mm6 ; mm1 = g7g6g5g4g3g2g1g0
punpcklbw mm1, mm0 ; mm1 = __g3__g2__g1__g0
movq mm0, mm3 ; mm0 = b7b6b5b4b3b2b1b0
punpcklbw mm0, mm7 ; mm0 = r3b3r2b2r1b1r0b0
movq mm2, mm0 ; mm2 = r3b3r2b2r1b1r0b0
punpcklbw mm0, mm1 ; mm0 = __r1g1b1__r0g0b0
punpckhbw mm2, mm1 ; mm2 = __r3g3b3__r2g2b2
// 32-bit save...
movq [eax], mm0 ; eax[0] = __r1g1b1__r0g0b0
movq mm1, mm6 ; mm1 = g7g6g5g4g3g2g1g0
movq 8[eax], mm2 ; eax[8] = __r3g3b3__r2g2b2
// 32-bit shuffle....
pxor mm0, mm0 ; is this needed?
punpckhbw mm1, mm0 ; mm1 = __g7__g6__g5__g4
movq mm0, mm3 ; mm0 = b7b6b5b4b3b2b1b0
punpckhbw mm0, mm7 ; mm0 = r7b7r6b6r5b5r4b4
movq mm2, mm0 ; mm2 = r7b7r6b6r5b5r4b4
punpcklbw mm0, mm1 ; mm0 = __r5g5b5__r4g4b4
punpckhbw mm2, mm1 ; mm2 = __r7g7b7__r6g6b6
//32-bit save...
add ebx, 8 ; puc_y += 8;
add ecx, 4 ; puc_u += 4;
movq 16[eax], mm0 ; eax[16] = __r5g5b5__r4g4b4
add edx, 4 ; puc_v += 4;
movq 24[eax], mm2 ; eax[24] = __r7g7b7__r6g6b6
// 0 1 2 3 4 5 6 7 rgb save order
add eax, 32 ; puc_out += 32
inc edi
jne horiz_loop
pop edi
pop edx
pop ecx
pop ebx
pop eax
emms
}
puc_y += stride_y;
if (y&0x01){//%2) {
puc_u += stride_uv;
puc_v += stride_uv;
}
puc_out += stride_out;
}
}
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