这个程序里几个参数是什么意思
#include <stdio.h>
#include <conio.h>
#include <sys/stat.h>
#include <ddraw.h>
#pragma comment(lib,"ddraw.lib")
unsigned char *y;
unsigned char *u;
unsigned char *v;
bool testsize(int w, int h, int s, int *pw, int *ph);
int main(int argc, char *argv[])
{
HRESULT hr;
LPDIRECTDRAW lpDD;
DDSURFACEDESC ddsd;
LPDIRECTDRAWSURFACE lpPrimary;
LPDIRECTDRAWSURFACE lpOverlay;
RECT rcSrc;
FILE *fd;
int i, j, f;
char name[256];
unsigned char *py, *pu, *pv;
unsigned int *dst;
int ffirst, fcount, ms_per_frame;
int width, height, size;
int width2, height2, size2;
int t1, t2;
char c;
bool done, wait;
if (argc != 4 && argc != 6 && argc != 7)
{
fprintf(stderr, "vidplay template first count [width height [ms_per_frame]]");
return -1;
}
sscanf(argv[2], "%d", &ffirst);
sscanf(argv[3], "%d", &fcount);
if (argc == 7)
{
sscanf(argv[6], "%d", &ms_per_frame);
}
else
{
ms_per_frame = 33;
}
if (argc >= 6)
{
sscanf(argv[4], "%d", &width);
sscanf(argv[5], "%d", &height);
}
else
{
struct _stat st;
sprintf(name, argv[1], ffirst);
if (_stat(name, &st) != 0)
return -1;
size = st.st_size;
if (!(testsize( 176, 144, size, &width, &height)
|| testsize( 352, 240, size, &width, &height)
|| testsize( 352, 480, size, &width, &height)
|| testsize( 704, 480, size, &width, &height)
|| testsize( 720, 480, size, &width, &height)
|| testsize( 352, 288, size, &width, &height)
|| testsize( 352, 576, size, &width, &height)
|| testsize( 704, 576, size, &width, &height)
|| testsize( 720, 576, size, &width, &height)
|| testsize( 8, 8, size, &width, &height)
|| testsize( 16, 16, size, &width, &height)
|| testsize( 32, 32, size, &width, &height)
|| testsize( 64, 64, size, &width, &height)
|| testsize( 128, 128, size, &width, &height)
|| testsize( 256, 256, size, &width, &height)
|| testsize( 512, 512, size, &width, &height)
|| testsize(1024,1024, size, &width, &height)))
{
fprintf(stderr, "Nonstandard picture size: specify width and height\n");
return -1;
}
}
width2 = width/2;
height2 = height/2;
size = width*height;
size2 = width2*height2;
y = (unsigned char *)malloc(size);
u = (unsigned char *)malloc(size2);
v = (unsigned char *)malloc(size2);
if (y == NULL || u == NULL || v ==NULL)
{
fprintf(stderr, "Out of memory\n");
return -1;
}
hr = DirectDrawCreate(NULL, &lpDD, NULL);
if (FAILED(hr)) { fprintf(stderr, "DirectDrawCreate failed\n"); return -1; }
hr = lpDD->SetCooperativeLevel(NULL, DDSCL_NORMAL);
if (FAILED(hr)) { fprintf(stderr, "SetCooperativeLevel failed\n"); return -1; }
ZeroMemory(&ddsd, sizeof(ddsd));
ddsd.dwSize = sizeof(ddsd);
ddsd.dwFlags = DDSD_CAPS;
ddsd.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE;
hr = lpDD->CreateSurface(&ddsd, &lpPrimary, NULL);
if (FAILED(hr)) { fprintf(stderr, "CreateSurface (primary) failed\n"); return -1; }
ZeroMemory(&ddsd, sizeof(ddsd));
ddsd.dwSize = sizeof(ddsd);
ddsd.dwFlags = DDSD_CAPS | DDSD_WIDTH | DDSD_HEIGHT | DDSD_PIXELFORMAT;
ddsd.ddsCaps.dwCaps = DDSCAPS_OVERLAY;
ddsd.dwWidth = width;
ddsd.dwHeight = height;
ddsd.ddpfPixelFormat.dwSize = sizeof(DDPIXELFORMAT);
ddsd.ddpfPixelFormat.dwFlags = DDPF_FOURCC;
ddsd.ddpfPixelFormat.dwFourCC = 0x32595559; // YUY2
hr = lpDD->CreateSurface(&ddsd, &lpOverlay, NULL);
if (FAILED(hr)) { fprintf(stderr, "CreateSurface (overlay) failed\n"); return -1; }
ZeroMemory(&ddsd, sizeof(ddsd));
ddsd.dwSize = sizeof(ddsd);
hr = lpOverlay->Lock(NULL, &ddsd, DDLOCK_SURFACEMEMORYPTR, NULL);
if (FAILED(hr)) { fprintf(stderr, "Lock failed\n"); return -1; }
for (i=0; i<height; i++)
{
dst = (unsigned int *)(((unsigned char *)ddsd.lpSurface) + i * ddsd.lPitch);
for (j=0; j<width2; j++)
{
dst[j] = 0x00800080;
}
}
hr = lpOverlay->Unlock(NULL);
SetRect(&rcSrc, 0, 0, width, height);
hr = lpOverlay->UpdateOverlay(NULL, lpPrimary, NULL, DDOVER_SHOW, NULL);
if (FAILED(hr)) { fprintf(stderr, "UpdateOverlay failed\n"); return -1; }
done = false;
wait = false;
while (!done)
{
t1 = timeGetTime();
for (f=ffirst; f<ffirst+fcount; f++)
{
sprintf(name, argv[1], f);
fd = fopen(name, "rb");
if (fd != NULL)
{
fread(y, 1, size, fd);
fread(u, 1, size2, fd);
fread(v, 1, size2, fd);
fclose(fd);
}
else
{
char name1[256];
sprintf(name1, "%s.Y", name);
fd = fopen(name1, "rb");
if (fd != NULL)
{
fread(y, 1, size, fd);
fclose(fd);
sprintf(name1, "%s.U", name);
fd = fopen(name1, "rb");
fread(u, 1, size2, fd);
fclose(fd);
sprintf(name1, "%s.V", name);
fd = fopen(name1, "rb");
fread(v, 1, size2, fd);
fclose(fd);
}
}
if (fd != NULL)
{
t2 = t1 - timeGetTime();
if (t2 > 0) Sleep(t2);
ZeroMemory(&ddsd, sizeof(ddsd));
ddsd.dwSize = sizeof(ddsd);
hr = lpOverlay->Lock(NULL, &ddsd, DDLOCK_SURFACEMEMORYPTR, NULL);
if (SUCCEEDED(hr))
{
for (i=0; i<height; i++)
{
dst = (unsigned int *)(((unsigned char *)ddsd.lpSurface) + i * ddsd.lPitch);
py = &y[width*i];
pu = &u[width2*(i>>1)];
pv = &v[width2*(i>>1)];
for (j=0; j<width2; j++)
{
dst[j] = py[j<<1] | (pu[j]<<8) | (py[(j<<1)+1]<<16) | (pv[j]<<24);
}
}
hr = lpOverlay->Unlock(NULL);
}
if (wait || _kbhit())
{
c = _getch();
if (c=='q')
{
done = true;
break;
}
else if (c==' ')
wait = true;
else
{
wait = false;
t1 = timeGetTime();
}
}
}
t1 += ms_per_frame;
}
t2 = t1 - timeGetTime();
if (t2 > 0) Sleep(t2);
}
hr = lpOverlay->UpdateOverlay(NULL, lpPrimary, NULL, DDOVER_HIDE, NULL);
lpOverlay->Release();
lpPrimary->Release();
lpDD->Release();
return 0;
}
bool testsize(int w, int h, int s, int *pw, int *ph)
{
if (s == w*h || s == (w*h*3)/2)
{
*pw = w;
*ph = h;
return true;
}
return false;
}
argv[1],argv[2],argv[3],这几个参数是干什么的，能给个输入例子吗
------解决方案--------------------
sprintf, swprintf
Write formatted data to a string.
int sprintf( char *buffer, const char *format [, argument] ... );
