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Display (Linux): detect refresh rate for DRM method

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李通洲
2024-04-18 09:52:55 +08:00
parent 9860fb67d4
commit 64ec76f5a6
3 changed files with 49 additions and 32 deletions
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src/util/edidHelper.c
+19
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@@ -7,6 +7,25 @@ void ffEdidGetPhysicalResolution(const uint8_t edid[128], uint32_t* width, uint3
*height = (((uint32_t) edid[dtd + 7] >> 4) << 8) | edid[dtd + 5];
}
void ffEdidGetPreferredResolutionAndRefreshRate(const uint8_t edid[128], uint32_t* width, uint32_t* height, double* refreshRate)
{
for (uint32_t i = 0x36; i < 0x7E; i += 0x12)
{ // read through descriptor blocks...
if (edid[i] != 0x00 && edid[i + 1] != 0x00)
{ // a dtd
uint32_t hactive = edid[i+2] + ((edid[i + 4] & 0xf0) << 4);
uint32_t hblank = edid[i+3] + ((edid[i + 4] & 0x0f) << 8);
uint32_t vactive = edid[i+5] + ((edid[i + 7] & 0xf0) << 4);
uint32_t vblank = edid[i+6] + ((edid[i + 7] & 0x0f) << 8);
uint32_t pixclk = (edid[i+1] << 8) | (edid[i]);
*width = hactive;
*height = vactive;
*refreshRate = (double)pixclk * 10000 / (double)(hactive+hblank) / (double)(vactive+vblank);
return;
}
}
}
void ffEdidGetVendorAndModel(const uint8_t edid[128], FFstrbuf* result)
{
// https://github.com/jinksong/read_edid/blob/master/parse-edid/parse-edid.c
src/util/edidHelper.h
+1
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@@ -5,6 +5,7 @@
void ffEdidGetVendorAndModel(const uint8_t edid[128], FFstrbuf* result);
bool ffEdidGetName(const uint8_t edid[128], FFstrbuf* name);
void ffEdidGetPreferredResolutionAndRefreshRate(const uint8_t edid[128], uint32_t* width, uint32_t* height, double* refreshRate);
void ffEdidGetPhysicalResolution(const uint8_t edid[128], uint32_t* width, uint32_t* height);
void ffEdidGetPhysicalSize(const uint8_t edid[128], uint32_t* width, uint32_t* height); // in mm
void ffEdidGetSerialAndManufactureDate(const uint8_t edid[128], uint32_t* serial, uint16_t* year, uint16_t* week);