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#include <revolution.h>
#include <revolution/si.h>
#include "__os.h"
#define LATENCY 8
static u32 SamplingRate = 0;
typedef struct XY {
u16 line;
u8 count;
} XY;
static XY XYNTSC[12] = {
{0x00F6, 0x02},
{0x000E, 0x13},
{0x001E, 0x09},
{0x002C, 0x06},
{0x0034, 0x05},
{0x0041, 0x04},
{0x0057, 0x03},
{0x0057, 0x03},
{0x0057, 0x03},
{0x0083, 0x02},
{0x0083, 0x02},
{0x0083, 0x02},
};
static XY XYPAL[12] = {
{0x0128, 0x02},
{0x000F, 0x15},
{0x001D, 0x0B},
{0x002D, 0x07},
{0x0034, 0x06},
{0x003F, 0x05},
{0x004E, 0x04},
{0x0068, 0x03},
{0x0068, 0x03},
{0x0068, 0x03},
{0x0068, 0x03},
{0x009C, 0x02},
};
void SISetSamplingRate(u32 msec) {
XY* xy;
BOOL progressive;
BOOL enabled;
ASSERTMSGLINE(387, msec <= 11, "SISetSamplingRate(): out of rage (0 <= msec <= 11)");
if (msec > 11) {
msec = 11;
}
enabled = OSDisableInterrupts();
SamplingRate = msec;
switch (VIGetTvFormat()) {
case VI_NTSC:
case VI_MPAL:
case VI_EURGB60:
xy = XYNTSC;
break;
case VI_PAL:
xy = XYPAL;
break;
default:
OSReport("SISetSamplingRate: unknown TV format. Use default.");
msec = 0;
xy = XYNTSC;
break;
}
progressive = __VIRegs[VI_CLOCK_SEL] & 1;
SISetXY((progressive ? 2 : 1) * xy[msec].line, xy[msec].count);
OSRestoreInterrupts(enabled);
}
void SIRefreshSamplingRate(void) {
SISetSamplingRate(SamplingRate);
}
#if DEBUG
void __SITestSamplingRate(u32 tvmode) {
u32 msec;
u32 line;
u32 count;
XY* xy;
switch (tvmode) {
case VI_NTSC:
case VI_MPAL:
xy = XYNTSC;
for (msec = 0; msec <= 11; msec++) {
line = xy[msec].line;
count = xy[msec].count;
OSReport("%2d[msec]: count %3d, line %3d, last %3d, diff0 %2d.%03d, diff1 %2d.%03d\n",
msec, count, line, line * (count - 1) + LATENCY, (line * 636) / 10000, (line * 636) % 10000,
((263 - line * (count - 1)) * 636) / 10000, ((263 - line * (count - 1)) * 636) % 10000);
ASSERTLINE(446, line * (count - 1) + LATENCY < 263);
if (msec != 0) {
ASSERTLINE(449, 636 * line < msec * 10000);
ASSERTLINE(450, 636 * (263 - line * (count - 1)) < msec * 10000);
}
}
break;
case VI_PAL:
xy = XYPAL;
for (msec = 0; msec <= 11; msec++) {
line = xy[msec].line;
count = xy[msec].count;
OSReport("%2d[msec]: count %3d, line %3d, last %3d, diff0 %2d.%03d, diff1 %2d.%03d\n",
msec, count, line, line * (count - 1) + LATENCY, (line * 640) / 10000, (line * 640) % 10000,
((313 - line * (count - 1)) * 640) / 10000, ((313 - line * (count - 1)) * 640) % 10000);
ASSERTLINE(470, line * (count - 1) + LATENCY < 313);
if (msec != 0) {
ASSERTLINE(473, 640 * line < msec * 10000);
ASSERTLINE(474, 640 * (313 - line * (count - 1)) < msec * 10000);
}
}
break;
}
}
#endif
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