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video_common: Fixed pixel clock calculation for interlaced modes.

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In interlaced mode, the vertical total lines for frames 0 and 1 may not
necessarily be equal (off by 1). The pixel clock calculation needs to take this
into account by taking their average.

Signed-off-by: Andrei-Liviu Simion <andrei.simion@xilinx.com>
This commit is contained in:
Andrei-Liviu Simion 2015-01-26 17:27:47 -08:00 • committed by Nava kishore Manne
parent 767e6749ee
commit 0194e3fc17
1 changed files with 13 additions and 10 deletions
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23
XilinxProcessorIPLib/drivers/video_common/src/xvidc.c
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@ -93,24 +93,27 @@ u32 XVidC_GetPixelClockHzByVmId(XVidC_VideoMode VmId)
VmPtr = &XVidC_VideoTimingModes[VmId];
/* For pixel clock calculation, use frame with the larger vertical
* total. This is useful for interlaced modes with frames that don't
* have exactly the same vertical total. For progressive modes,
* F0PVTotal will be used since F1PVTotal will be equal to 0. */
if (VmPtr->Timing.F0PVTotal >= VmPtr->Timing.F1VTotal) {
ClkHz = VmPtr->Timing.F0PVTotal;
if (XVidC_IsInterlaced(VmId)) {
/* For interlaced mode, use both frame 0 and frame 1 vertical
* totals. */
ClkHz = VmPtr->Timing.F0PVTotal + VmPtr->Timing.F1VTotal;
/* Multiply the number of pixels by the frame rate of each
* individual frame (half of the total frame rate). */
ClkHz *= VmPtr->FrameRate / 2;
}
else {
ClkHz = VmPtr->Timing.F1VTotal;
/* For progressive mode, use only frame 0 vertical total. */
ClkHz = VmPtr->Timing.F0PVTotal;
/* Multiply the number of pixels by the frame rate. */
ClkHz *= VmPtr->FrameRate;
}
/* Multiply the vertical total by the horizontal total for number of
* pixels. */
ClkHz *= VmPtr->Timing.HTotal;
/* Multiply the number of pixels by the frame rate. */
ClkHz *= VmPtr->FrameRate;
return ClkHz;
}