--------------------------------------------------------------------------------
|
--------------------------------------------------------------------------------
|
-- --
|
-- --
|
-- V H D L F I L E --
|
-- V H D L F I L E --
|
-- COPYRIGHT (C) 2009 --
|
-- COPYRIGHT (C) 2009 --
|
-- --
|
-- --
|
--------------------------------------------------------------------------------
|
--------------------------------------------------------------------------------
|
--
|
--
|
-- Title : JPEG_PKG
|
-- Title : JPEG_PKG
|
-- Design : JPEG_ENC
|
-- Design : JPEG_ENC
|
-- Author : Michal Krepa
|
-- Author : Michal Krepa
|
--
|
--
|
--------------------------------------------------------------------------------
|
--------------------------------------------------------------------------------
|
--
|
--
|
-- File : JPEG_PKG.VHD
|
-- File : JPEG_PKG.VHD
|
-- Created : Sat Mar 7 2009
|
-- Created : Sat Mar 7 2009
|
--
|
--
|
--------------------------------------------------------------------------------
|
--------------------------------------------------------------------------------
|
--
|
--
|
-- Description : Package for JPEG core
|
-- Description : Package for JPEG core
|
--
|
--
|
--------------------------------------------------------------------------------
|
--------------------------------------------------------------------------------
|
|
|
library IEEE;
|
library IEEE;
|
use IEEE.STD_LOGIC_1164.all;
|
use IEEE.STD_LOGIC_1164.all;
|
use ieee.numeric_std.all;
|
use ieee.numeric_std.all;
|
|
|
package JPEG_PKG is
|
package JPEG_PKG is
|
|
|
-- do not change, constant
|
-- do not change, constant
|
constant C_HDR_SIZE : integer := 623;
|
constant C_HDR_SIZE : integer := 623;
|
|
|
-- warning! this parameter heavily affects memory size required
|
-- warning! this parameter heavily affects memory size required
|
-- if expected image width is known change this parameter to match this
|
-- if expected image width is known change this parameter to match this
|
-- otherwise some onchip RAM will be wasted and never used
|
-- otherwise some onchip RAM will be wasted and never used
|
constant C_MAX_LINE_WIDTH : integer := 1280;
|
constant C_MAX_LINE_WIDTH : integer := 640;
|
|
|
-- memory/performance tradeoff
|
-- memory/performance tradeoff
|
-- 8 extra lines highest performance
|
-- 8 extra lines highest performance
|
-- 0 extra lines lowest area
|
-- 0 extra lines lowest area
|
constant C_EXTRA_LINES : integer := 8; -- from 0 to 8
|
constant C_EXTRA_LINES : integer := 8; -- from 0 to 8
|
|
|
|
|
-- 24 bit format RGB 888 bits
|
-- 24 bit format RGB 888 bits
|
-- 16 bit format RGB 565 bits
|
-- 16 bit format RGB 565 bits
|
constant C_PIXEL_BITS : integer := 24;
|
constant C_PIXEL_BITS : integer := 24;
|
|
|
type T_SM_SETTINGS is record
|
type T_SM_SETTINGS is record
|
x_cnt : unsigned(15 downto 0);
|
x_cnt : unsigned(15 downto 0);
|
y_cnt : unsigned(15 downto 0);
|
y_cnt : unsigned(15 downto 0);
|
cmp_idx : unsigned(1 downto 0);
|
cmp_idx : unsigned(1 downto 0);
|
end record;
|
end record;
|
|
|
constant C_SM_SETTINGS : T_SM_SETTINGS :=
|
constant C_SM_SETTINGS : T_SM_SETTINGS :=
|
(
|
(
|
(others => '0'),
|
(others => '0'),
|
(others => '0'),
|
(others => '0'),
|
(others => '0')
|
(others => '0')
|
);
|
);
|
|
|
function log2(n : natural) return natural;
|
function log2(n : natural) return natural;
|
|
|
end package JPEG_PKG;
|
end package JPEG_PKG;
|
|
|
package body JPEG_PKG is
|
package body JPEG_PKG is
|
|
|
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------------
|
function log2(n : natural)
|
function log2(n : natural)
|
return natural is
|
return natural is
|
begin
|
begin
|
for i in 0 to 31 loop
|
for i in 0 to 31 loop
|
if (2**i) >= n then
|
if (2**i) >= n then
|
return i;
|
return i;
|
end if;
|
end if;
|
end loop;
|
end loop;
|
return 32;
|
return 32;
|
end log2;
|
end log2;
|
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------------
|
|
|
|
|
