usr_routines.c

来自「快速开发基于Blackfin处理器的视频应用」· C语言 代码 · 共 544 行 · 第 1/2 页

	memdma1_descriptor_data[9].Large.StartAddress = (void *)&(Video_Frames[Video_Frame_Completed_Number])[Start_of_active_Video_Frame[3]];
	memdma1_descriptor_data[10].Large.StartAddress = (void *)&(Video_Frames[Video_Frame_Completed_Number])[Start_of_active_Video_Frame[4]];
	memdma1_descriptor_data[11].Large.StartAddress = (void *)&(Video_Frames[Video_Frame_Completed_Number])[Start_of_active_Video_Frame[5]];
}

/*
**
** Function:            InitDescriptorChains_Input
**
** Description:         Initialize the MDMA descriptor chains for input from PPI
**
**
*/
void InitDescriptorChains_Input()
{
	// prepare the Video Frame ->YUV MEMDMA
	// from these input parameters, set up the missing fixed parameters in the descriptor chains (do not vary from frame to frame)
	
	// source Y 1st half
	memdma1_descriptor_data[0].Large.XCount = Input_Width;
	memdma1_descriptor_data[0].Large.YCount = Input_Height/2;
	memdma1_descriptor_data[0].Large.YModify = Input_Width + 1;
	
	// destination Y 1st half
	memdma1_descriptor_data[6].Large.XCount = Input_Width;
	memdma1_descriptor_data[6].Large.YCount = Input_Height/2;
	memdma1_descriptor_data[6].Large.YModify = (CCIR656_WIDTH-(Input_Width-1)*2);

	// source U 1st half
	memdma1_descriptor_data[1].Large.XCount = Input_Width/2;
	memdma1_descriptor_data[1].Large.YCount = Input_Height/2;
	memdma1_descriptor_data[1].Large.YModify = 1;
	
	// destination U 1st half
	memdma1_descriptor_data[7].Large.XCount = Input_Width/2;
	memdma1_descriptor_data[7].Large.YCount = Input_Height/2;
	memdma1_descriptor_data[7].Large.YModify = (CCIR656_WIDTH-(Input_Width-1)*2+2);
	
	// source V 1st half
	memdma1_descriptor_data[2].Large.XCount = Input_Width/2;
	memdma1_descriptor_data[2].Large.YCount = Input_Height/2;
	memdma1_descriptor_data[2].Large.YModify = 1;
	
	// destination V 1st half
	memdma1_descriptor_data[8].Large.XCount = Input_Width/2;
	memdma1_descriptor_data[8].Large.YCount = Input_Height/2;
	memdma1_descriptor_data[8].Large.YModify = (CCIR656_WIDTH-(Input_Width-1)*2+2);

	// setup 2nd half of YUV source descriptor chain (MEMDMA channel 0)
	// only Y is required

	// source Y 2nd half
	memdma1_descriptor_data[3].Large.XCount = Input_Width;
	memdma1_descriptor_data[3].Large.YCount = Input_Height/2;
	memdma1_descriptor_data[3].Large.YModify = Input_Width  + 1;
	
	// destination Y 2nd half
	memdma1_descriptor_data[9].Large.XCount = Input_Width;
	memdma1_descriptor_data[9].Large.YCount = Input_Height/2;
	memdma1_descriptor_data[9].Large.YModify = (CCIR656_WIDTH-(Input_Width-1)*2);	
	
	// center in output display
	Frame_Offset = max(0, (CCIR656_ACTIVEWIDTH - Input_Width)/2)*2 + max(0, (CCIR656_ACTIVEHEIGHT - Input_Height)/2) * CCIR656_WIDTH/2;

	Start_of_active_Video_Frame[0] = (CCIR656_WIDTH*CCIR656_FIELD1_OFFSET) + (CCIR656_WIDTH-2*CCIR656_ACTIVEWIDTH) + CCIR656_YOFFSET + Frame_Offset;
	Start_of_active_Video_Frame[1] = (CCIR656_WIDTH*CCIR656_FIELD1_OFFSET) + (CCIR656_WIDTH-2*CCIR656_ACTIVEWIDTH) + CCIR656_UOFFSET + Frame_Offset;
	Start_of_active_Video_Frame[2] = (CCIR656_WIDTH*CCIR656_FIELD1_OFFSET) + (CCIR656_WIDTH-2*CCIR656_ACTIVEWIDTH) + CCIR656_VOFFSET + Frame_Offset;
	Start_of_active_Video_Frame[3] = (CCIR656_WIDTH*CCIR656_FIELD2_OFFSET) + (CCIR656_WIDTH-2*CCIR656_ACTIVEWIDTH) + CCIR656_YOFFSET + Frame_Offset;	
}


/*
**
** Function:            InitDescriptorChains_Input
**
** Description:         Initialize the MDMA descriptor chains for input from PPI
**
**
*/
void ConfigDescriptorChains_Input()
{
	char *lOutputBuffer;

	lOutputBuffer = (char*)YUV_Buffer_Address[YUVBufferReadIndex];
	
	// source Y 1st half
	memdma1_descriptor_data[0].Large.StartAddress = lOutputBuffer;
	// source U 1st half
	memdma1_descriptor_data[1].Large.StartAddress = lOutputBuffer + Input_Width*Input_Height;
	// source V 1st half
	memdma1_descriptor_data[2].Large.StartAddress = lOutputBuffer + Input_Width*Input_Height*5/4;
	// source Y 2nd half, start at second row of Y buffer
	memdma1_descriptor_data[3].Large.StartAddress = lOutputBuffer + Input_Width;

	// destination MDMA descriptors	
	memdma1_descriptor_data[6].Large.StartAddress = (void *)&(Video_Frames[Video_Frame_Completed_Number])[Start_of_active_Video_Frame[0]];			
	memdma1_descriptor_data[7].Large.StartAddress = (void *)&(Video_Frames[Video_Frame_Completed_Number])[Start_of_active_Video_Frame[1]];			
	memdma1_descriptor_data[8].Large.StartAddress = (void *)&(Video_Frames[Video_Frame_Completed_Number])[Start_of_active_Video_Frame[2]];					
	memdma1_descriptor_data[9].Large.StartAddress = (void *)&(Video_Frames[Video_Frame_Completed_Number])[Start_of_active_Video_Frame[3]];
}


/*
**
** Function:            PPI_Out_User_Callback
**
** Description:         PPI callback handlers (output)
**
**
*/
void PPI_Out_User_Callback (
	void *AppHandle,
	u32  Event,
	void *pArg)
{
	// CASEOF (event type)
	switch (Event) {
		
		// CASE (buffer processed)
		case ADI_DEV_EVENT_BUFFER_PROCESSED:
				// when the buffer chain was created, the CallbackParameter value for the buffer
				// that was generating the callback was set to be the number of the processed Video Frame
				// So here in the callback that value is passed in as the pArg parameter.  
				
				Video_Frame_Completed_Number = (int)pArg -1;	// frame that was just completed
				Video_Frame_Completed_Flag = true;				// semaphore to indicate it was completed
				
				Video_Frame_Counter++;							// total number of frame that have been processed
							
				if (Start_MDMA)
				{
					if (Frame_Ready)
					{
						// Check to see if there is a new frame to play
						if (BufferLevel > 0)
						{
							Frame_Ready = false;
	
							ConfigDescriptorChains_Output();
							KickOff_YUV_to_VideoFrame_DMA();
						}
						else
							Frame_Dropped_Counter++;
					}
					else 
					{
						Frame_Dropped_Counter++;
					}
				}

				break;
				
		// CASE (an error)
		case ADI_DEV_EVENT_DMA_ERROR_INTERRUPT:
		case ADI_PPI_EVENT_ERROR_INTERRUPT:
		
			// turn on all LEDs and wait for help
			ezTurnOnAllLEDs();
			while (1) ;
			
	// ENDCASE
	}
	
	// return
}



/*
**
** Function:            PPI_In_User_Callback
**
** Description:         PPI callback handlers (input)
**
**
*/
void PPI_In_User_Callback(
	void *AppHandle,
	u32  Event,
	void *pArg)
{ 
	// CASEOF (event type)
	switch (Event) {
		
		// CASE (buffer processed)
		case ADI_DEV_EVENT_BUFFER_PROCESSED:
				// when the buffer chain was created, the CallbackParameter value for the buffer
				// that was generating the callback was set to be the number of the processed Video Frame
				// So here in the callback that value is passed in as the pArg parameter.  
				
				Video_Frame_Completed_Number = (int)pArg -1;	// frame that was just completed
				Video_Frame_Completed_Flag = true;				// semaphore to indicate it was completed
				
				Video_Frame_Counter++;							// total number of frame that have been processed
				if (Start_MDMA) 
				{
					if (Frame_Ready)
					{
						if (BufferLevel > 0)
						{
							ConfigDescriptorChains_Input();
							Frame_Ready = false;
							KickOff_YUV_to_VideoFrame_DMA();
						}
						else
						{
							Frame_Dropped_Counter++;
							Frame_Dropped = true;
						}
					}
					else
					{
						Frame_Dropped_Counter++;
						Frame_Dropped = true;
					}						
				}
				break;				
		// CASE (an error)
		case ADI_DEV_EVENT_DMA_ERROR_INTERRUPT:
		case ADI_PPI_EVENT_ERROR_INTERRUPT:		
			// turn on all LEDs and wait for help
			ezTurnOnAllLEDs();
			while (1) ;
			
	// ENDCASE
	}
	
	// return
}



/*
**
** Function:            MDMA1_User_Callback
**
** Description:         MDMA1 ISR
**
**
*/
void MDMA1_User_Callback( void    *AppHandle,
                          u32     Event,
                          void    *pArg   )
{
	// CASEOF (event type)
	switch (Event) {
		
		// CASE (buffer processed)
		case ADI_DMA_EVENT_DESCRIPTOR_PROCESSED:
		
			if (BufferLevel > 0)
			{
			    UpdateYUVIndex(UPDATETYPE_READ);
			    BufferLevel--;
			}

			Frame_Ready = true;			
						
			break;
			
		// CASE (an error)
		case ADI_DMA_EVENT_ERROR_INTERRUPT:
		
			// turn on all LEDs and wait for help
			ezTurnOnAllLEDs();
			while (1) ;
			
	// ENDCASE
	}
}