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/*****************************************************************************/
/**
*
* @file scaler_example.c
*
* This file demonstrates how to use Xilinx XScaler driver on Xilinx MVI Video
* Scaler core. This code does not cover the Video DMA (VDMA) setup and any
* other configuration which might be required to get the Scaler working
* properly.
*
* This code makes the following assumptions:
* - Caching is disabled. Flushing and Invalidation operations for data buffer
* need to be added to this code if it is not the case.
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver Who Date Changes
* ----- --- -------- ------------------------------------------------------
* 1.00a xd 02/09/09 First release
* 7.00 adk 22/08/14 Renamed example.c to scaler_example.c
* XPAR_SCALER_0_DEVICE_ID is changed to
* XPAR_XSCALER_0_DEVICE_ID.
* Chaged typecast of XScaler_CoefValueLookup from u16 to
* s16.
* </pre>
*
*****************************************************************************/
#include "xscaler.h"
#include "xparameters.h"
/*
* Device related constants. Defined in xparameters.h.
*/
#define SCALER_DEVICE_ID XPAR_XSCALER_0_DEVICE_ID
/*
* Index of Coefficient Set to load and use
*/
#define COEFF_SET_INDEX 0
/*
* Scaler Device related data structures
*/
XScaler ScalerInstance; /* Device driver instance */
XScalerAperture Aperture; /* Aperture setting */
XScalerStartFraction StartFraction; /* Luma/Chroma Start Fraction setting*/
XScalerCoeffBank CoeffBank; /* Coefficient bank */
static int ScalerExample(u16 ScalerDeviceID);
static void DownScale(XScaler *ScalerInstPtr);
static void UpScale(XScaler *ScalerInstPtr);
static void ScalerSetup(XScaler *ScalerInstPtr,
int ScalerInWidth, int ScalerInHeight,
int ScalerOutWidth, int ScalerOutHeight);
/*****************************************************************************/
/**
*
* This is the main function for the Scaler example. This function is not
* included if the example is generated from the TestAppGen test tool.
*
* @param None.
*
* @return 0 to indicate success, otherwise 1.
*
* @note None.
*
****************************************************************************/
int main(void)
{
int Status;
/*
* Call the Scaler example , specify the Device ID generated in
* xparameters.h
*/
Status = ScalerExample(SCALER_DEVICE_ID);
if (Status != 0) {
return 1;
}
printf("\n Successfully ran Scaler example \n");
return 0;
}
/*****************************************************************************/
/**
*
* This function is the entry of the feature demonstrations on MVI Video Scaler
* core. It initializes the Scaler device, then starts operations like
* format downscaling and format up scaling.
*
* @param ScalerDeviceID is the device ID of the scaler core.
*
* @return 0 if all tests pass, 1 otherwise.
*
* @note None.
*
******************************************************************************/
static int ScalerExample(u16 ScalerDeviceID)
{
int Status;
XScaler_Config *ScalerCfgPtr;
u32 Rdy;
/* Initialize the Scaler instance */
ScalerCfgPtr = XScaler_LookupConfig(ScalerDeviceID);
Status = XScaler_CfgInitialize(&ScalerInstance, ScalerCfgPtr,
ScalerCfgPtr->BaseAddress);
if (Status) {
return 1;
}
/* DownScaling example */
DownScale(&ScalerInstance);
/* UpScaling example */
UpScale(&ScalerInstance);
/* All tests passed. Return success */
return 0;
}
/*****************************************************************************/
/**
*
* This function shows the downscaling feature. This function downscales the
* video format from 1280x720 to 640x480.
*
* @param ScalerInstPtr is the pointer to the instance of the Scaler
* device.
*
* @return None
*
* @note None.
*
******************************************************************************/
static void DownScale(XScaler *ScalerInstPtr)
{
int InWidth, InHeight, OutWidth, OutHeight;
InWidth = 1280;
InHeight = 720;
OutWidth = 640;
OutHeight = 480;
ScalerSetup (ScalerInstPtr, InWidth, InHeight, OutWidth, OutHeight);
return;
}
/*****************************************************************************/
/**
*
* This function shows the up scaling feature. This function up scales the
* video format from 640x480 to 1280x720.
*
* @param ScalerInstPtr is the pointer to the instance of the Scaler
* device.
*
* @return None
*
* @note None.
*
******************************************************************************/
static void UpScale(XScaler *ScalerInstPtr)
{
int InWidth, InHeight, OutWidth, OutHeight;
InWidth = 640;
InHeight = 480;
OutWidth = 1280;
OutHeight = 720;
ScalerSetup (ScalerInstPtr, InWidth, InHeight, OutWidth, OutHeight);
return;
}
/*****************************************************************************/
/**
*
* This function sets up the scaler core for the feature demonstrations below.
* After the execution of this function, a set of coefficient value (containing
* 2 vertical and 2 horizontal coefficient banks) are loaded; aperture is set
* up and the scaling operation is started. This function is utilized by
* DownScale() and UpScale().
*
* @param ScalerInstPtr is the pointer to the instance of the Scaler
* device.
*
* @param ScalerInWidth is the width of the input aperture.
*
* @param ScalerInHeight is the height of the input aperture.
*
* @param ScalerOutWidth is the width of the output aperture.
*
* @param ScalerOutHeight is the height of the output aperture.
*
* @return None.
*
* @note None.
*
******************************************************************************/
static void ScalerSetup(XScaler *ScalerInstPtr,
int ScalerInWidth, int ScalerInHeight,
int ScalerOutWidth, int ScalerOutHeight)
{
int i;
u8 ChromaFormat;
u8 ChromaLumaShareCoeffBank;
u8 HoriVertShareCoeffBank;
/*
* Disable the scaler before setup and tell the device not to pick up
* the register updates until all are done
*/
XScaler_Disable(ScalerInstPtr);
XScaler_DisableRegUpdate(ScalerInstPtr);
/*
* Load a set of Coefficient values
*/
/* Fetch Chroma Format and Coefficient sharing info */
XScaler_GetCoeffBankSharingInfo(ScalerInstPtr,
&ChromaFormat,
&ChromaLumaShareCoeffBank,
&HoriVertShareCoeffBank);
CoeffBank.SetIndex = COEFF_SET_INDEX;
CoeffBank.PhaseNum = ScalerInstPtr->Config.MaxPhaseNum;
CoeffBank.TapNum = ScalerInstPtr->Config.VertTapNum;
/* Locate coefficients for Horizontal scaling */
CoeffBank.CoeffValueBuf = (u16 *)
XScaler_CoefValueLookup(ScalerInWidth,
ScalerOutWidth,
CoeffBank.TapNum,
CoeffBank.PhaseNum);
/* Load coefficient bank for Horizontal Luma */
XScaler_LoadCoeffBank(ScalerInstPtr, &CoeffBank);
/* Horizontal Chroma bank is loaded only if chroma/luma sharing flag
* is not set */
if (!ChromaLumaShareCoeffBank)
XScaler_LoadCoeffBank(ScalerInstPtr, &CoeffBank);
/* Vertical coeff banks are loaded only if horizontal/vertical sharing
* flag is not set
*/
if (!HoriVertShareCoeffBank) {
/* Locate coefficients for Vertical scaling */
CoeffBank.CoeffValueBuf = (u16 *)
XScaler_CoefValueLookup(ScalerInHeight,
ScalerOutHeight,
CoeffBank.TapNum,
CoeffBank.PhaseNum);
/* Load coefficient bank for Vertical Luma */
XScaler_LoadCoeffBank(ScalerInstPtr, &CoeffBank);
/* Vertical Chroma coeff bank is loaded only if chroma/luma
* sharing flag is not set
*/
if (!ChromaLumaShareCoeffBank)
XScaler_LoadCoeffBank(ScalerInstPtr, &CoeffBank);
}
/*
* Load phase-offsets into scaler
*/
StartFraction.LumaLeftHori = 0;
StartFraction.LumaTopVert = 0;
StartFraction.ChromaLeftHori = 0;
StartFraction.ChromaTopVert = 0;
XScaler_SetStartFraction(ScalerInstPtr, &StartFraction);
/*
* Set up Aperture.
*/
Aperture.InFirstLine = 0;
Aperture.InLastLine = ScalerInHeight - 1;
Aperture.InFirstPixel = 0;
Aperture.InLastPixel = ScalerInWidth - 1;
Aperture.OutVertSize = ScalerOutHeight;
Aperture.OutHoriSize = ScalerOutWidth;
Aperture.SrcVertSize = ScalerInHeight;
Aperture.SrcHoriSize = ScalerInWidth;
XScaler_SetAperture(ScalerInstPtr, &Aperture);
/*
* Set up phases
*/
XScaler_SetPhaseNum(ScalerInstPtr, ScalerInstPtr->Config.MaxPhaseNum,
ScalerInstPtr->Config.MaxPhaseNum);
/*
* Choose active set indexes for both vertical and horizontal directions
*/
XScaler_SetActiveCoeffSet(ScalerInstPtr, COEFF_SET_INDEX,
COEFF_SET_INDEX);
/*
* Enable the scaling operation
*/
XScaler_EnableRegUpdate(ScalerInstPtr);
XScaler_Enable(ScalerInstPtr);
return;
}