I have uploaded one of the Hedghog files.
Copy the text and put it into into a VHDL file in the editor in Quartus it will look a lot better.
It's name is out_405 and most everything on the 405 side of the converter is contained in it. This is the latest version that does aspect ratio conversions of. 4:3 => 4:3, 4:3 => 5:4, 16:9 => 4:3 and 16:9 =>5:4.
There is a set of constants for each set of aspect ratios. When a aspect ratio is selected it's associated constants are loaded and used. In order to make changing standards conversion to a different standard I have included extra constants in each set.
So potentially it can do up to 4 different standards.
To do 567 lines I would suggest trying the following
Pixel clock frequency 11.19825 MHz
Full line 790 pixels = 70.55 uS
Front porch 8 pixels = 0.714 uS
Sync 63 pixels = 5.63 uS
Back porch 17 pixels = 1.52 uS
Active line 702 pixles= 62.69 uS
Equ pulse 32 pixels = 2.86 uS
Broad pulse 330 pixels = 29.47 us
An example below of how this would fit into one set of constants. In this case selecting 16:9 => 5:4 on Hedghog would select 567 lines instead.
Code:
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--- constants for 16:9 => 5:4 ---
-------------------------------------------------------------------------------------------------
-- changed for 567 lines
constant LINES_IN_A_FRAME_54_169 : integer := 567; -- number of lines in a frame
constant FULL_LINE_VAL_54_169 : integer := 790; -- number of pixels in a full line
constant LINE_SYNC_START_54_169 : integer := 0; -- number of pixels to start of sync
constant LINE_SYNC_STOP_54_169 : integer := 63; -- number of pixels of line sync
constant BROAD_PULSE_STOP_54_169 : integer := 330; -- number of pixels of broad pulse
constant AVID_START_54_169 : integer := 81; -- activ video start pixel
constant AVID_STOP_54_169 : integer := 783; -- activ video stop pixel
constant MEM_RD_START_54_169 : integer := 71; -- memory read start pixel
constant MEM_RD_STOP_54_169 : integer := 790; -- memory read stop pixel
constant EQU_PULSE_STOP_54_169 : integer := 32; -- no of pixels of equ pulse
constant BP_START_NORM_B_54_169 : integer := 0; --broad pulse normal start 1/2 line
constant BP_STOP_NORM_B_54_169 : integer := 8; --broad pulse normal stop 1/2 line
constant BP_START_EQU_B_54_169 : integer := 6; --broad pulse with equ pulse start 1/2 line
constant BP_STOP_EQU_B_54_169 : integer := 12; --broad pulse with equ pulse stop 1/2 line
constant EQU_PULSE_START_B_54_169 : integer := 0; -- equ pulse start 1/2 line
constant EQU_PULSE_STOP_B_54_169 : integer := 18; -- equ pulse stop 1/2 line
constant AV_LINE_NO_START_54_169 : integer := 38; -- activ video start line for video output (half lines)
constant AV_LINE_NO_STOP_54_169 : integer := 561; -- activ video stop line for video output (half lines)
-- coff for oversampler clock, pixel clock = 11.19825 MHz
constant DTO_COEF_54_169 : std_logic_vector(31 downto 0) := conv_std_logic_vector(890668843, 32);
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The 625 line file will need to be changed as well as this where the interpolation is done.
In the interpolater when the number of output lines changes. The number of coefficients per interpolated line changes as well. So a new new set of coefficients will need to be calculated for each standard.
When I get the 625 file finished I will post here.
Frank
