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UV calc.

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This commit is contained in:
Jean-François DEL NERO 2023-02-22 23:29:36 +01:00
parent 6cce053cc7
commit e800258a8e
2 changed files with 10 additions and 1 deletions
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8
src/broadcast_tv/composite.c
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@ -137,6 +137,9 @@ void init_composite(composite_state * state, int sample_rate, int x_res, int y_r
state->r_yconv[i] = (double)i * 0.299; state->r_yconv[i] = (double)i * 0.299;
state->g_yconv[i] = (double)i * 0.587; state->g_yconv[i] = (double)i * 0.587;
state->b_yconv[i] = (double)i * 0.114; state->b_yconv[i] = (double)i * 0.114;
state->uconv[i] = (double)i * 0.492;
state->vconv[i] = (double)i * 0.877;
} }
state->step_index = 0; state->step_index = 0;
@ -146,7 +149,7 @@ void init_composite(composite_state * state, int sample_rate, int x_res, int y_r
void gen_video_signal(composite_state * state, double * vid_signal, int buf_size) void gen_video_signal(composite_state * state, double * vid_signal, int buf_size)
{ {
int i,xpos; int i,xpos;
double value,yvalue; double value,yvalue,uvalue,vvalue;
uint32_t rgb_word; uint32_t rgb_word;
value = 0; value = 0;
@ -201,6 +204,9 @@ void gen_video_signal(composite_state * state, double * vid_signal, int buf_size
// Y / Luminance // Y / Luminance
yvalue = state->r_yconv[rgb_word & 0xFF] + state->g_yconv[( rgb_word >> 8 )& 0xFF] + state->b_yconv[( rgb_word >> 16 )& 0xFF]; yvalue = state->r_yconv[rgb_word & 0xFF] + state->g_yconv[( rgb_word >> 8 )& 0xFF] + state->b_yconv[( rgb_word >> 16 )& 0xFF];
// UV
uvalue = (double)((( rgb_word >> 16 )& 0xFF) - yvalue)*0.492;
vvalue = (double)(( rgb_word & 0xFF) - yvalue)*0.877;
value += (double)( yvalue * ((double)((double)100.0 - vertical_blanking[state->step_index].end_val)/(double)256)); value += (double)( yvalue * ((double)((double)100.0 - vertical_blanking[state->step_index].end_val)/(double)256));
} }

3
src/broadcast_tv/composite.h
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@ -43,6 +43,9 @@ typedef struct composite_state_
double g_yconv[256]; double g_yconv[256];
double b_yconv[256]; double b_yconv[256];
double uconv[256];
double vconv[256];
}composite_state; }composite_state;
typedef struct pulses_state_ typedef struct pulses_state_