📄 huffman.vhd
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library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.std_logic_unsigned.all;
use IEEE.std_logic_arith.all;
use work.all_types.all;
use work.huffman_types.all; -- this file contains all the tables of huffman decoders
entity huffman is
port( clk : in std_logic; -- input clock signal
rst : in std_logic; -- reset signal ('1' = reset)
start : in std_logic; -- start='1' means that this component is activated
done : out std_logic; -- produce a done signal when process is finished
gr : in std_logic; -- granule ('0'=granule0, '1'=granule1)
bin : in std_logic_vector(7 downto 0); -- input main data for huffman
addr : out std_logic_vector(9 downto 0); -- address for main data
dout : out std_logic_vector(31 downto 0); -- data to memory
memc : out mem_control_type; -- memeory controll signal
sco : out scalefac_type; -- output scale factors
frm : in frame_type -- contains all header and side information for the current frame
);
end;
architecture behavioral of huffman is
type state_type is
( IDLE1,IDLE2,IDLE3,READ,READ1,READ2,READREADY,SCALE,HUFFMAN,HUFFBIGVALUE,TABLELOOKUP1,HUFFCOUNT1,TABLELOOKUP2,HUFFEND,DATAREADY,READY );
signal cs,ns:state_type;
type is_type is array (0 to 575) of integer;
signal isg : is_type;
signal addrcount1:std_logic_vector(9 downto 0);
signal valuebuffer : std_logic_vector(0 to 8191 );
begin
process(cs, frm, gr, start)
variable scalefac : integer;
variable count : integer ;
variable memaddrcount : std_logic_vector(9 downto 0);
variable scout : scalefac_type;
variable bitpos:std_logic_vector(12 downto 0);
variable region1start,region2start,bigvalues,count1s,start_bit1,start_bit2,start_bit,tempbit: integer;
variable line,line1,region,old_region : integer;
variable u,w,x,y,linbits:integer;
variable level,level1,value,temp,templevel:integer;
variable tindex:integer range 0 to 33;
variable tempvector : std_logic_vector(7 downto 0);
variable tempvector1 : std_logic_vector(3 downto 0);
variable slenval0,slenval1:integer;
variable tempval,tempdata,temphuff,temphuff1,temppos:integer;
variable tempcount1:std_logic;
begin
case cs is
when IDLE1 =>
addrcount1 <= (others =>'0');
ns<=IDLE2;
when IDLE2 =>
done <= '0';
count :=0;
line :=0;
line1 :=0;
bigvalues:=0;
count1s:=0;
start_bit:=0;
linbits:=0;
tempvector1:=(others =>'0');
tempvector:=(others =>'0');
tindex:=0;
temp:=0;
value:=0;
isg<=(others=>0);
ns<=IDLE3;
when IDLE3 =>
if (start = '1') then
memaddrcount :=(others =>'0');
end if;
ns<=READ;
when READ =>
addr <= addrcount1;
ns<=READ1;
when READ1=>
ns<=READREADY;
when READREADY =>
valuebuffer(count to count+7 ) <= bin;
count := count +8;
addrcount1 <= addrcount1 +1;
if count=8192 then
if gr='0' then
bitpos:=conv_std_logic_vector((conv_integer(frm.sideinfo.main_data)*8),13);
else
start_bit2:=conv_integer(bitpos);
end if;
ns<= SCALE;
else
ns<= READ;
end if;
when SCALE => scalefac := conv_integer(frm.sideinfo.scalefac_compress);
slenval0:= slen(0,scalefac);
slenval1:= slen(1,scalefac);
if (frm.sideinfo.blocksplit_flag = '1') and (frm.sideinfo.block_type = "10") then
if (frm.sideinfo.switch_point = '1' ) then
for sfb in 0 to 7 loop
if 8191-conv_integer(bitpos)+1>=slenval0 then
scout.scalefac_l(sfb) := conv_std_logic_vector(conv_integer(valuebuffer(conv_integer(bitpos) to conv_integer(bitpos)+slenval0-1)),4);
if 8191-conv_integer(bitpos)+1=slenval0 then
bitpos:=(others=>'0');
tempcount1:='1';
else
bitpos := conv_std_logic_vector((conv_integer(bitpos) + slenval0),13);
end if;
else
temppos:=conv_integer(bitpos);
tempval:=8191-temppos+1;
scout.scalefac_l(sfb) :=
conv_std_logic_vector(conv_integer(valuebuffer(temppos to 8191)& valuebuffer(0 to slenval0-tempval-1)),4);
bitpos:=(others=>'0');
tempcount1:='1';
bitpos := conv_std_logic_vector((slenval0-tempval),13);
end if;
end loop;
for sfb in 3 to 11 loop
for window in 0 to 2 loop
if (sfb < 6) then
if 8191-conv_integer(bitpos)+1>=slenval0 then
scout.scalefac_s(sfb)(window):= conv_std_logic_vector(conv_integer(valuebuffer(conv_integer(bitpos) to conv_integer(bitpos)+slenval0-1)),4);
if 8191-conv_integer(bitpos)+1=slenval0 then
bitpos:=(others=>'0');
tempcount1:='1';
else
bitpos := conv_std_logic_vector((conv_integer(bitpos) + slenval0),13);
end if;
else
temppos:=conv_integer(bitpos);
tempval:=8191-temppos+1;
scout.scalefac_s(sfb)(window):=
conv_std_logic_vector(conv_integer(valuebuffer(temppos to 8191)& valuebuffer(0 to slenval0-tempval-1)),4);
bitpos:=(others=>'0');
tempcount1:='1';
bitpos := conv_std_logic_vector((slenval0-tempval),13);
end if;
else
if 8191-conv_integer(bitpos)+1>=slenval1 then
scout.scalefac_s(sfb)(window):=
conv_std_logic_vector(conv_integer(valuebuffer(conv_integer(bitpos) to conv_integer(bitpos)+slenval1-1)),4);
if 8191-conv_integer(bitpos)+1=slenval1 then
bitpos:=(others=>'0');
tempcount1:='1';
else
bitpos := conv_std_logic_vector((conv_integer(bitpos) + slenval1),13);
end if;
else
temppos:=conv_integer(bitpos);
tempval:=8191-temppos+1;
scout.scalefac_s(sfb)(window):=
conv_std_logic_vector(conv_integer(valuebuffer(temppos to 8191)& valuebuffer(0 to slenval1-tempval-1)),4);
bitpos:=(others=>'0');
tempcount1:='1';
bitpos := conv_std_logic_vector((slenval1-tempval),13);
end if;
end if;
end loop;
end loop;
else
for sfb in 0 to 11 loop
for window in 0 to 2 loop
if (sfb < 6) then
if 8191-conv_integer(bitpos)+1>=slenval0 then
scout.scalefac_s(sfb)(window):= conv_std_logic_vector(conv_integer(valuebuffer(conv_integer(bitpos) to conv_integer(bitpos)+slenval0-1)),4);
if 8191-conv_integer(bitpos)+1=slenval0 then
bitpos:=(others=>'0');
tempcount1:='1';
else
bitpos := conv_std_logic_vector((conv_integer(bitpos) + slenval0),13);
end if;
else
temppos:=conv_integer(bitpos);
tempval:=8191-temppos+1;
scout.scalefac_s(sfb)(window):=
conv_std_logic_vector(conv_integer(valuebuffer(temppos to 8191)& valuebuffer(0 to slenval0-tempval-1)),4);
bitpos:=(others=>'0');
tempcount1:='1';
bitpos := conv_std_logic_vector((slenval0-tempval),13);
end if;
else
if 8191-conv_integer(bitpos)+1>=slenval1 then
scout.scalefac_s(sfb)(window):=
conv_std_logic_vector(conv_integer(valuebuffer(conv_integer(bitpos) to conv_integer(bitpos)+slenval1-1)),4);
if 8191-conv_integer(bitpos)+1=slenval1 then
bitpos:=(others=>'0');
tempcount1:='1';
else
bitpos := conv_std_logic_vector((conv_integer(bitpos) + slenval1),13);
end if;
else
temppos:=conv_integer(bitpos);
tempval:=8191-temppos+1;
scout.scalefac_s(sfb)(window):=
conv_std_logic_vector(conv_integer(valuebuffer(temppos to 8191)& valuebuffer(0 to slenval1-tempval-1)),4);
bitpos:=(others=>'0');
tempcount1:='1';
bitpos := conv_std_logic_vector((slenval1-tempval),13);
end if;
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