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committed Tim Ferguson's patch for proper YUV color space conversion

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@4077 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
melanson 2002-01-10 05:58:49 +00:00
parent 738fc8a6b4
commit 073c1e07fc
1 changed files with 38 additions and 7 deletions
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45
cinepak.c
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@ -43,6 +43,12 @@ typedef struct {
/* ------------------------------------------------------------------------ */
static unsigned char *in_buffer, uiclip[1024], *uiclp = NULL;
#define SCALEBITS 16
#define ONE_HALF ((long) 1 << (SCALEBITS-1))
#define FIX(x) ((long) ((x) * (1L<<SCALEBITS) + 0.5))
static long CU_Y_tab[256], CV_Y_tab[256], CU_Cb_tab[256], CV_Cb_tab[256],
CU_Cr_tab[256], CV_Cr_tab[256];
#define get_byte() *(in_buffer++)
#define skip_byte() in_buffer++
#define get_word() ((unsigned short)(in_buffer += 2, \
@ -54,6 +60,8 @@ static unsigned char *in_buffer, uiclip[1024], *uiclp = NULL;
/* ---------------------------------------------------------------------- */
static inline void read_codebook_yuy2(cvid_codebook *c, int mode)
{
unsigned char y0, y1, y2, y3, u, v;
int y_uv;
if(mode) /* black and white */
{
@ -65,12 +73,25 @@ static inline void read_codebook_yuy2(cvid_codebook *c, int mode)
}
else /* colour */
{
c->y0 = get_byte(); /* luma */
c->y1 = get_byte();
c->y2 = get_byte();
c->y3 = get_byte();
c->u = 128+get_byte(); /* chroma */
c->v = 128+get_byte();
y0 = get_byte(); /* luma */
y1 = get_byte();
y2 = get_byte();
y3 = get_byte();
u = 128+get_byte(); /* chroma */
v = 128+get_byte();
/* YUV * inv(CinYUV)
* | Y | | 1 -0.0655 0.0110 | | CY |
* | Cb | = | 0 1.1656 -0.0062 | | CU |
* | Cr | | 0 0.0467 1.4187 | | CV |
*/
y_uv = (int)((CU_Y_tab[u] + CV_Y_tab[v]) >> SCALEBITS);
c->y0 = uiclp[y0 + y_uv];
c->y1 = uiclp[y1 + y_uv];
c->y2 = uiclp[y2 + y_uv];
c->y3 = uiclp[y3 + y_uv];
c->u = uiclp[(int)((CU_Cb_tab[u] + CV_Cb_tab[v]) >> SCALEBITS)];
c->v = uiclp[(int)((CU_Cr_tab[u] + CV_Cr_tab[v]) >> SCALEBITS)];
}
}
@ -324,7 +345,7 @@ int row_inc = stride-4*3;
void *decode_cinepak_init(void)
{
cinepak_info *cvinfo;
int i;
int i, x;
if((cvinfo = calloc(sizeof(cinepak_info), 1)) == NULL) return NULL;
cvinfo->strip_num = 0;
@ -336,6 +357,16 @@ int i;
uiclp[i] = (i < 0 ? 0 : (i > 255 ? 255 : i));
}
for(i = 0, x = -128; i < 256; i++, x++)
{
CU_Y_tab[i] = (-FIX(0.0655)) * x;
CV_Y_tab[i] = (FIX(0.0110)) * x + ONE_HALF;
CU_Cb_tab[i] = (FIX(1.1656)) * x;
CV_Cb_tab[i] = (-FIX(0.0062)) * x + ONE_HALF + FIX(128);
CU_Cr_tab[i] = (FIX(0.0467)) * x;
CV_Cr_tab[i] = (FIX(1.4187)) * x + ONE_HALF + FIX(128);
}
return (void *)cvinfo;
}