1 |
6 |
galland |
----------------------------------------------------------------------------------
|
2 |
|
|
-- Company: VISENGI S.L. (www.visengi.com)
|
3 |
|
|
-- Engineer: Victor Lopez Lorenzo (victor.lopez (at) visengi (dot) com)
|
4 |
|
|
--
|
5 |
7 |
galland |
-- Create Date: 19:34:36 04/November/2008
|
6 |
6 |
galland |
-- Project Name: IMA ADPCM Encoder
|
7 |
|
|
-- Tool versions: Xilinx ISE 9.2i
|
8 |
|
|
-- Description:
|
9 |
|
|
--
|
10 |
|
|
-- Description: This project features a full-hardware sound compressor using the well known algorithm IMA ADPCM.
|
11 |
|
|
-- The core acts as a slave WISHBONE device. The output is perfectly compatible with any sound player
|
12 |
|
|
-- with the IMA ADPCM codec (included by default in every Windows). Includes a testbench that takes
|
13 |
|
|
-- an uncompressed PCM 16 bits Mono WAV file and outputs an IMA ADPCM compressed WAV file.
|
14 |
|
|
-- Compression ratio is fixed for IMA-ADPCM, being 4:1.
|
15 |
|
|
--
|
16 |
|
|
--
|
17 |
7 |
galland |
-- LICENSE TERMS: GNU GENERAL PUBLIC LICENSE Version 3
|
18 |
|
|
--
|
19 |
|
|
-- That is you may use it only in NON-COMMERCIAL projects.
|
20 |
|
|
-- You are only required to include in the copyrights/about section
|
21 |
|
|
-- that your system contains a "IMA ADPCM Encoder (C) VISENGI S.L. under GPL license"
|
22 |
6 |
galland |
-- This holds also in the case where you modify the core, as the resulting core
|
23 |
|
|
-- would be a derived work.
|
24 |
|
|
-- Also, we would like to know if you use this core in a project of yours, just an email will do.
|
25 |
|
|
--
|
26 |
7 |
galland |
-- Please take good note of the disclaimer section of the GPL license, as we don't
|
27 |
6 |
galland |
-- take any responsability for anything that this core does.
|
28 |
|
|
----------------------------------------------------------------------------------
|
29 |
|
|
|
30 |
|
|
library IEEE;
|
31 |
|
|
use IEEE.STD_LOGIC_1164.ALL;
|
32 |
|
|
use IEEE.STD_LOGIC_ARITH.ALL;
|
33 |
|
|
use IEEE.STD_LOGIC_UNSIGNED.ALL;
|
34 |
|
|
|
35 |
|
|
entity IMA_ADPCM_top is
|
36 |
|
|
Port ( wb_clk_i : in std_logic;
|
37 |
|
|
wb_rst_i : in std_logic;
|
38 |
|
|
wb_cyc_i : in std_logic;
|
39 |
|
|
wb_stb_i : in std_logic;
|
40 |
|
|
wb_we_i : in std_logic;
|
41 |
|
|
wb_adr_i : in std_logic_vector(1 downto 0);
|
42 |
|
|
wb_dat_i : in std_logic_vector(15 downto 0);
|
43 |
|
|
wb_dat_o : out std_logic_vector(15 downto 0);
|
44 |
|
|
wb_ack_o : out std_logic);
|
45 |
|
|
end IMA_ADPCM_top;
|
46 |
|
|
|
47 |
|
|
architecture Behavioral of IMA_ADPCM_top is
|
48 |
|
|
component IMA_ADPCM_Encode port (
|
49 |
|
|
clk : in STD_LOGIC;
|
50 |
|
|
reset : in STD_LOGIC;
|
51 |
|
|
PredictedValue_o : out std_logic_vector(15 downto 0);
|
52 |
|
|
StepIndex_o : out std_logic_vector(6 downto 0);
|
53 |
|
|
StateRDY : out std_logic;
|
54 |
|
|
sample : in std_logic_vector(15 downto 0); --don't change it while sample_rdy='1'
|
55 |
|
|
sample_rdy : in std_logic; --lower it only when ADPCM_sample_rdy = '1'
|
56 |
|
|
ADPCM_sample : out std_logic_vector(3 downto 0);
|
57 |
|
|
ADPCM_sample_rdy : out std_logic);
|
58 |
|
|
end component;
|
59 |
|
|
|
60 |
|
|
component WAV_header_rom port(
|
61 |
|
|
addr0 : in STD_LOGIC_VECTOR(5 downto 0);
|
62 |
|
|
clk : in STD_LOGIC;
|
63 |
|
|
datao0: out STD_LOGIC_VECTOR(7 downto 0));
|
64 |
|
|
end component;
|
65 |
|
|
|
66 |
|
|
signal WAV_addr : std_logic_vector(5 downto 0);
|
67 |
|
|
signal WAV_data : std_logic_vector(7 downto 0);
|
68 |
|
|
|
69 |
|
|
signal sample : std_logic_vector(15 downto 0);
|
70 |
|
|
signal ADPCM_sample : std_logic_vector(3 downto 0);
|
71 |
|
|
signal sample_rdy, ADPCM_sample_rdy : std_logic;
|
72 |
|
|
|
73 |
|
|
signal soft_reset, isoft_reset : std_logic;
|
74 |
|
|
signal iwb_ack_o : std_logic;
|
75 |
|
|
|
76 |
|
|
|
77 |
|
|
-- IMPORTANT: Remember that flow control MUST be done externally (that is, if SamplesPerSec is set to 8000, then 8000 samples must be fed every second)
|
78 |
|
|
-- The first 60 bytes of data correspond to the WAV header
|
79 |
|
|
--
|
80 |
|
|
--WISHBONE REGS' DESCRIPTION:
|
81 |
|
|
--reg 0: Control(W: WRITES)/Status(R: READS)
|
82 |
|
|
-- bit 15: (R) 0=finished, 1=compressing (W) 0=end file (if compressing), 1=start file compression
|
83 |
|
|
-- clearing this bit while compressing doesn't immediately end it, because the current block must be finished (block size=256 bytes)
|
84 |
|
|
-- the only thing that happens is that the next samples up to the end of the block (samples_per_block=505) will be zeros (silence).
|
85 |
|
|
-- bit 1: (R) 1=ready for new input sample to be written on reg 3 (auto-cleared on write to reg 3), 0=processing last input sample
|
86 |
|
|
-- bit 0: (R) 1=16 bits of output file are ready to be read on reg 3 (auto-cleared on read to reg 3), 0=processing next output word
|
87 |
|
|
--reg 1: SamplesPerSec (i.e.: 8000, 22050, 32000, 44100, ...)
|
88 |
|
|
--reg 2: SecondsToCompress (0 for undefined (max values will be used in file headers) -> the sound will be complete and reproducible but an "early EOF" or "damaged file" error may appear in player at the end of the sound)
|
89 |
|
|
--reg 3: On writes: a 16 bit sample is expected - On reads: data lines will contain 16 bits of the compressed output file (only if reg(0)(0)='1'!!!)
|
90 |
|
|
--output words of 16 bits should be read from MSB to LSB
|
91 |
|
|
|
92 |
|
|
signal SamplesPerSec1, SecondsToCompress2, CompressedWord : std_logic_vector(15 downto 0);
|
93 |
|
|
signal InputRDY, OutputRDY, OutputRDY_sync2, RDYOutput, FinishBlock : std_logic;
|
94 |
|
|
signal StartCompressing, Compressing, EndCompression : std_logic;
|
95 |
|
|
signal CompressedNibbles : integer range 0 to 4;
|
96 |
|
|
|
97 |
|
|
signal WriteHeader, WriteHeader_sync2 : std_logic;
|
98 |
|
|
signal WriteState, WriteState_sync2 : std_logic;
|
99 |
|
|
signal BlockBytes : integer range 0 to 255;
|
100 |
|
|
signal SecondsCompressed : std_logic_vector(15 downto 0);
|
101 |
|
|
signal SamplesCompressed : std_logic_vector(15 downto 0);
|
102 |
|
|
signal MSB, LoadROM : std_logic;
|
103 |
|
|
signal SamplesInFile : std_logic_vector(31 downto 0);
|
104 |
|
|
|
105 |
|
|
signal PredictedValue : std_logic_vector(15 downto 0);
|
106 |
|
|
signal StepIndex : std_logic_vector(6 downto 0);
|
107 |
|
|
signal StateRDY : std_logic;
|
108 |
|
|
signal WriteStateLSWord : std_logic;
|
109 |
|
|
begin
|
110 |
|
|
isoft_reset <= soft_reset or wb_rst_i;
|
111 |
|
|
|
112 |
|
|
WAV_ROM: WAV_header_rom port map (
|
113 |
|
|
addr0 => WAV_addr,
|
114 |
|
|
clk => wb_clk_i,
|
115 |
|
|
datao0 => WAV_data);
|
116 |
|
|
|
117 |
|
|
IMA_ADPCM_Encoder : IMA_ADPCM_Encode port map (
|
118 |
|
|
clk => wb_clk_i,
|
119 |
|
|
reset => isoft_reset,
|
120 |
|
|
PredictedValue_o => PredictedValue,
|
121 |
|
|
StepIndex_o => StepIndex,
|
122 |
|
|
StateRDY => StateRDY,
|
123 |
|
|
sample => sample,
|
124 |
|
|
sample_rdy => sample_rdy,
|
125 |
|
|
ADPCM_sample => ADPCM_sample,
|
126 |
|
|
ADPCM_sample_rdy => ADPCM_sample_rdy);
|
127 |
|
|
|
128 |
|
|
Input_process : process (wb_clk_i, wb_rst_i)
|
129 |
|
|
variable WaitW : std_logic;
|
130 |
|
|
begin
|
131 |
|
|
if (wb_rst_i = '1') then
|
132 |
|
|
iwb_ack_o <= '0';
|
133 |
|
|
wb_dat_o <= (others => '0');
|
134 |
|
|
InputRDY <= '0';
|
135 |
|
|
OutputRDY <= '0';
|
136 |
|
|
OutputRDY_sync2 <= '0';
|
137 |
|
|
SamplesPerSec1 <= (others => '0');
|
138 |
|
|
SecondsToCompress2 <= (others => '0');
|
139 |
|
|
Compressing <= '0';
|
140 |
|
|
StartCompressing <= '0';
|
141 |
|
|
WaitW := '0';
|
142 |
|
|
soft_reset <= '0';
|
143 |
|
|
|
144 |
|
|
sample <= (others => '0');
|
145 |
|
|
sample_rdy <= '0';
|
146 |
|
|
elsif (wb_clk_i = '1' and wb_clk_i'event) then
|
147 |
|
|
OutputRDY_sync2 <= OutputRDY;
|
148 |
|
|
soft_reset <= '0';
|
149 |
|
|
iwb_ack_o <= wb_cyc_i and wb_stb_i and not iwb_ack_o;
|
150 |
|
|
|
151 |
|
|
if (RDYOutput = '1') then OutputRDY <= '1'; end if;
|
152 |
|
|
if (ADPCM_sample_rdy = '1') then
|
153 |
|
|
sample_rdy <= '0';
|
154 |
|
|
if (CompressedNibbles < 3 and WriteState = '0') then InputRDY <= '1'; end if;
|
155 |
|
|
end if;
|
156 |
|
|
|
157 |
|
|
if (OutputRDY_sync2 = '1' and OutputRDY = '0' and WriteState = '0' and WriteHeader = '0') then InputRDY <= '1'; end if;
|
158 |
|
|
if (((OutputRDY_sync2 = '1' and OutputRDY = '0') or (WriteHeader_sync2 = '1' and WriteHeader = '0')) and WriteState = '1' and BlockBytes = 0 and WaitW = '0') then InputRDY <= '1'; WaitW := '1'; end if; --to write the block header one input sample is required
|
159 |
|
|
if (WriteState_sync2 = '1' and WriteState = '0') then InputRDY <= '1'; WaitW := '0'; end if; --after writing the block header, ask for input sample
|
160 |
|
|
|
161 |
|
|
|
162 |
|
|
if (EndCompression = '1') then Compressing <= '0'; end if;
|
163 |
|
|
|
164 |
|
|
if (FinishBlock = '1') then
|
165 |
|
|
sample <= x"0000";
|
166 |
|
|
sample_rdy <= '1';
|
167 |
|
|
InputRDY <= '0';
|
168 |
|
|
end if;
|
169 |
|
|
|
170 |
|
|
if (wb_cyc_i = '1' and wb_stb_i = '1') then
|
171 |
|
|
case wb_adr_i is
|
172 |
|
|
when "00" => --control/status
|
173 |
|
|
if (wb_we_i = '0') then --read = status
|
174 |
|
|
wb_dat_o <= (others => '0');
|
175 |
|
|
wb_dat_o(15) <= Compressing;
|
176 |
|
|
wb_dat_o(1) <= InputRDY;
|
177 |
|
|
wb_dat_o(0) <= OutputRDY;
|
178 |
|
|
else --write = control
|
179 |
|
|
StartCompressing <= wb_dat_i(15);
|
180 |
|
|
if (wb_dat_i(15) = '1' and Compressing = '0') then --start new operation?
|
181 |
|
|
soft_reset <= '1';
|
182 |
|
|
OutputRDY <= '0';
|
183 |
|
|
InputRDY <= '0'; --wait for WriteHeader
|
184 |
|
|
Compressing <= '1';
|
185 |
|
|
end if;
|
186 |
|
|
end if;
|
187 |
|
|
when "11" => --data in/out
|
188 |
|
|
if (wb_we_i = '0') then --read = get compressed data
|
189 |
|
|
if (OutputRDY = '1') then
|
190 |
|
|
wb_dat_o <= CompressedWord;
|
191 |
|
|
OutputRDY <= '0';
|
192 |
|
|
end if;
|
193 |
|
|
else --write = put input sample
|
194 |
|
|
if (InputRDY = '1') then
|
195 |
|
|
if (FinishBlock = '0') then sample <= wb_dat_i; else sample <= x"0000"; end if;
|
196 |
|
|
sample_rdy <= '1';
|
197 |
|
|
InputRDY <= '0';
|
198 |
|
|
end if;
|
199 |
|
|
end if;
|
200 |
|
|
when "01" => --SamplesPerSec
|
201 |
|
|
if (wb_we_i = '0') then --read
|
202 |
|
|
wb_dat_o <= SamplesPerSec1;
|
203 |
|
|
else --write
|
204 |
|
|
SamplesPerSec1 <= wb_dat_i;
|
205 |
|
|
end if;
|
206 |
|
|
when "10" => --SecondsToCompress
|
207 |
|
|
if (wb_we_i = '0') then --read
|
208 |
|
|
wb_dat_o <= SecondsToCompress2;
|
209 |
|
|
else --write
|
210 |
|
|
SecondsToCompress2 <= wb_dat_i;
|
211 |
|
|
end if;
|
212 |
|
|
when others =>
|
213 |
|
|
report "-----------> Wrong WB Address!" severity WARNING;
|
214 |
|
|
end case;
|
215 |
|
|
end if;
|
216 |
|
|
end if;
|
217 |
|
|
end process;
|
218 |
|
|
|
219 |
|
|
wb_ack_o <= iwb_ack_o;
|
220 |
|
|
|
221 |
|
|
|
222 |
|
|
Output_process : process (wb_clk_i, wb_rst_i)
|
223 |
|
|
variable WaitADPCM : std_logic;
|
224 |
|
|
variable WAV_data_to_write : std_logic_vector(7 downto 0);
|
225 |
|
|
begin
|
226 |
|
|
if (wb_rst_i = '1') then
|
227 |
|
|
CompressedWord <= (others => '0');
|
228 |
|
|
RDYOutput <= '0';
|
229 |
|
|
WriteHeader <= '1';
|
230 |
|
|
WriteHeader_sync2 <= '1';
|
231 |
|
|
FinishBlock <= '0';
|
232 |
|
|
BlockBytes <= 0;
|
233 |
|
|
CompressedNibbles <= 0;
|
234 |
|
|
EndCompression <= '0';
|
235 |
|
|
MSB <= '1';
|
236 |
|
|
LoadROM <= '1';
|
237 |
|
|
WAV_addr <= (others => '0');
|
238 |
|
|
WAV_data_to_write := (others => '0');
|
239 |
|
|
|
240 |
|
|
SecondsCompressed <= (others => '0');
|
241 |
|
|
SamplesCompressed <= (others => '0');
|
242 |
|
|
|
243 |
|
|
WriteState <= '0';
|
244 |
|
|
WriteState_sync2 <= '0';
|
245 |
|
|
WriteStateLSWord <= '0';
|
246 |
|
|
WaitADPCM := '0';
|
247 |
|
|
elsif (wb_clk_i = '1' and wb_clk_i'event) then
|
248 |
|
|
WriteHeader_sync2 <= WriteHeader;
|
249 |
|
|
WriteState_sync2 <= WriteState;
|
250 |
|
|
|
251 |
|
|
if (WriteState_sync2 = '0' and WriteState = '1') then WaitADPCM := '1'; end if;
|
252 |
|
|
|
253 |
|
|
EndCompression <= '0';
|
254 |
|
|
RDYOutput <= '0';
|
255 |
|
|
if (StartCompressing = '0' and Compressing = '1') then FinishBlock <= '1'; end if; --finish compression on end of current block!
|
256 |
|
|
|
257 |
|
|
if (ADPCM_sample_rdy = '1' and WriteState = '0') then --because WriteState uses one ADPCM_sample_rdy to write its own header sample
|
258 |
|
|
case CompressedNibbles is --little endian on each byte (byte 0:n1n0, byte 1:n3n2, ...)
|
259 |
|
|
when 0 =>
|
260 |
|
|
CompressedWord(11 downto 8) <= ADPCM_sample;
|
261 |
|
|
CompressedNibbles <= CompressedNibbles + 1;
|
262 |
|
|
when 1 =>
|
263 |
|
|
CompressedWord(15 downto 12) <= ADPCM_sample;
|
264 |
|
|
CompressedNibbles <= CompressedNibbles + 1;
|
265 |
|
|
when 2 =>
|
266 |
|
|
CompressedWord(3 downto 0) <= ADPCM_sample;
|
267 |
|
|
CompressedNibbles <= CompressedNibbles + 1;
|
268 |
|
|
when 3 =>
|
269 |
|
|
CompressedWord(7 downto 4) <= ADPCM_sample;
|
270 |
|
|
CompressedNibbles <= CompressedNibbles + 1;
|
271 |
|
|
if (BlockBytes /= 254) then
|
272 |
|
|
BlockBytes <= BlockBytes + 2;
|
273 |
|
|
else
|
274 |
|
|
BlockBytes <= 0;
|
275 |
|
|
WriteState <= '1';
|
276 |
|
|
end if;
|
277 |
|
|
when others => --4 pending wb read of reg 3
|
278 |
|
|
CompressedNibbles <= CompressedNibbles;
|
279 |
|
|
end case;
|
280 |
|
|
|
281 |
|
|
|
282 |
|
|
if (SamplesCompressed = SamplesPerSec1) then
|
283 |
|
|
if (SecondsCompressed = SecondsToCompress2) then
|
284 |
|
|
FinishBlock <= '1'; --finish compression on end of current block!
|
285 |
|
|
else
|
286 |
|
|
SamplesCompressed <= (others => '0');
|
287 |
|
|
SecondsCompressed <= SecondsCompressed + 1;
|
288 |
|
|
end if;
|
289 |
|
|
else
|
290 |
|
|
SamplesCompressed <= SamplesCompressed + 1;
|
291 |
|
|
end if;
|
292 |
|
|
end if;
|
293 |
|
|
|
294 |
|
|
if (Compressing = '1' and EndCompression = '0') then
|
295 |
|
|
if (CompressedNibbles = 4) then
|
296 |
|
|
if (OutputRDY_sync2 = '1' and OutputRDY = '0') then
|
297 |
|
|
CompressedNibbles <= 0;
|
298 |
|
|
if (WriteStateLSWord = '0' and BlockBytes = 4) then WriteState <= '0'; end if; --lower it (but not in the cycle it is risen!)
|
299 |
|
|
else
|
300 |
|
|
if (OutputRDY = '0' and RDYOutput = '0') then RDYOutput <= '1'; end if;
|
301 |
|
|
end if;
|
302 |
|
|
else
|
303 |
|
|
if (RDYOutput = '0' and OutputRDY = '0') then --get next nibble/s if last CompressedWord is read
|
304 |
|
|
if (FinishBlock = '1') then --finish compression on end of current block!
|
305 |
|
|
if (BlockBytes = 0) then
|
306 |
|
|
EndCompression <= '1'; --signal input process the end of the compression
|
307 |
|
|
end if;
|
308 |
|
|
else --normal operation
|
309 |
|
|
if (WriteHeader = '1') then --output WAV header
|
310 |
|
|
if (LoadROM = '0') then
|
311 |
|
|
LoadROM <= '1'; --give the ROM time to read a byte
|
312 |
|
|
if (WAV_addr = "111100") then --last header byte + 1
|
313 |
|
|
WAV_addr <= (others => '0');
|
314 |
|
|
WriteHeader <= '0';
|
315 |
|
|
WriteState <= '1';
|
316 |
|
|
end if;
|
317 |
|
|
else
|
318 |
|
|
WAV_addr <= WAV_addr + 1;
|
319 |
|
|
WAV_data_to_write := WAV_data; --by default times are for undefined in WAV header
|
320 |
|
|
case WAV_addr is --all data is little-endian!
|
321 |
|
|
when "000100" => if (SecondsToCompress2 /= x"0000") then WAV_data_to_write := SamplesInFile(7 downto 0); end if; --LSB of file_size-8 (FF for undefined)
|
322 |
|
|
when "000101" => if (SecondsToCompress2 /= x"0000") then WAV_data_to_write := SamplesInFile(15 downto 8); end if; --LSB2 of file_size-8 (FF for undefined)
|
323 |
|
|
when "000110" => if (SecondsToCompress2 /= x"0000") then WAV_data_to_write := SamplesInFile(23 downto 16); end if; --MSB2 of file_size-8 (FF for undefined)
|
324 |
|
|
when "000111" => if (SecondsToCompress2 /= x"0000") then WAV_data_to_write := SamplesInFile(31 downto 24); end if; --MSB of file_size-8 (7F for undefined)
|
325 |
|
|
|
326 |
|
|
when "011000" => WAV_data_to_write := SamplesPerSec1(7 downto 0); --LSB of SamplesPerSec
|
327 |
|
|
when "011001" => WAV_data_to_write := SamplesPerSec1(15 downto 8); --MSB of SamplesPerSec
|
328 |
|
|
when "011100" => WAV_data_to_write := SamplesPerSec1(8 downto 1); --LSB of AvgBytesPerSec : approx. SamplesPerSec/2
|
329 |
|
|
when "011101" => WAV_data_to_write := '0' & SamplesPerSec1(15 downto 9); --MSB of AvgBytesPerSec : approx. SamplesPerSec/2
|
330 |
|
|
|
331 |
|
|
when "110000" => if (SecondsToCompress2 /= x"0000") then WAV_data_to_write := SamplesInFile(7 downto 0); end if; --LSB of SamplesPerChannelInFile (FF for undefined)
|
332 |
|
|
when "110001" => if (SecondsToCompress2 /= x"0000") then WAV_data_to_write := SamplesInFile(15 downto 8); end if; --LSB2 of SamplesPerChannelInFile (FF for undefined)
|
333 |
|
|
when "110010" => if (SecondsToCompress2 /= x"0000") then WAV_data_to_write := SamplesInFile(23 downto 16); end if; --MSB2 of SamplesPerChannelInFile (FF for undefined)
|
334 |
|
|
when "110011" => if (SecondsToCompress2 /= x"0000") then WAV_data_to_write := SamplesInFile(31 downto 24); end if; --MSB of SamplesPerChannelInFile (7F for undefined)
|
335 |
|
|
|
336 |
|
|
when "111000" => if (SecondsToCompress2 /= x"0000") then WAV_data_to_write := SamplesInFile(7 downto 0); end if; --LSB of file_size-60 (FF for undefined)
|
337 |
|
|
when "111001" => if (SecondsToCompress2 /= x"0000") then WAV_data_to_write := SamplesInFile(15 downto 8); end if; --LSB2 of file_size-60 (FF for undefined)
|
338 |
|
|
when "111010" => if (SecondsToCompress2 /= x"0000") then WAV_data_to_write := SamplesInFile(23 downto 16); end if; --MSB2 of file_size-60 (FF for undefined)
|
339 |
|
|
when "111011" => if (SecondsToCompress2 /= x"0000") then WAV_data_to_write := SamplesInFile(31 downto 24); end if; --MSB of file_size-60 (7F for undefined)
|
340 |
|
|
when others => null;
|
341 |
|
|
end case;
|
342 |
|
|
if (MSB = '1') then
|
343 |
|
|
CompressedWord(15 downto 8) <= WAV_data_to_write;
|
344 |
|
|
else
|
345 |
|
|
CompressedWord(7 downto 0) <= WAV_data_to_write;
|
346 |
|
|
CompressedNibbles <= 4; --signal word ready
|
347 |
|
|
end if;
|
348 |
|
|
MSB <= not MSB;
|
349 |
|
|
LoadROM <= '0';
|
350 |
|
|
end if;
|
351 |
|
|
else --output ADPCM data
|
352 |
|
|
if (WriteState = '1' and FinishBlock = '0') then --block header with state at the beginning and every 256 bytes
|
353 |
|
|
if (WaitADPCM = '1') then
|
354 |
|
|
if (ADPCM_sample_rdy = '1') then WaitADPCM := '0'; end if;
|
355 |
|
|
else
|
356 |
|
|
if (StateRDY = '1') then
|
357 |
|
|
if (WriteStateLSWord = '0') then --write first two bytes of state: PredictedValue
|
358 |
|
|
CompressedWord <= PredictedValue(7 downto 0) & PredictedValue(15 downto 8); --little endian!
|
359 |
|
|
BlockBytes <= 2;
|
360 |
|
|
SamplesCompressed <= SamplesCompressed + 1;
|
361 |
|
|
else --write second two bytes of state: StepIndex & x"00"
|
362 |
|
|
CompressedWord <= '0' & StepIndex & x"00";
|
363 |
|
|
--WriteState <= '0'; lower it only after Output written
|
364 |
|
|
BlockBytes <= BlockBytes + 2;
|
365 |
|
|
end if;
|
366 |
|
|
WriteStateLSWord <= not WriteStateLSWord;
|
367 |
|
|
CompressedNibbles <= 4; --signal word ready
|
368 |
|
|
end if;
|
369 |
|
|
end if;
|
370 |
|
|
else --data nibbles
|
371 |
|
|
null; --taken care of above
|
372 |
|
|
end if;
|
373 |
|
|
end if;
|
374 |
|
|
end if;
|
375 |
|
|
end if;
|
376 |
|
|
end if;
|
377 |
|
|
else
|
378 |
|
|
CompressedWord <= (others => '0');
|
379 |
|
|
RDYOutput <= '0';
|
380 |
|
|
WriteHeader <= '1';
|
381 |
|
|
FinishBlock <= '0';
|
382 |
|
|
BlockBytes <= 0;
|
383 |
|
|
CompressedNibbles <= 0;
|
384 |
|
|
EndCompression <= '0';
|
385 |
|
|
MSB <= '1';
|
386 |
|
|
LoadROM <= '1';
|
387 |
|
|
WAV_addr <= (others => '0');
|
388 |
|
|
SecondsCompressed <= (others => '0');
|
389 |
|
|
SamplesCompressed <= (others => '0');
|
390 |
|
|
WriteState <= '0';
|
391 |
|
|
WriteStateLSWord <= '0';
|
392 |
|
|
WaitADPCM := '0';
|
393 |
|
|
end if;
|
394 |
|
|
end if;
|
395 |
|
|
end process;
|
396 |
|
|
|
397 |
|
|
process (wb_clk_i, wb_rst_i)
|
398 |
|
|
begin
|
399 |
|
|
if (wb_rst_i = '1') then
|
400 |
|
|
SamplesInFile <= (others => '0');
|
401 |
|
|
elsif (wb_clk_i = '1' and wb_clk_i'event) then
|
402 |
|
|
--comment next lines to save up a lot of resources (multiplier),
|
403 |
|
|
--but then use undefined number of seconds for compression!!
|
404 |
|
|
--(to stop it just write 0 to the MSb of WB reg 0)
|
405 |
|
|
--just be aware that final WAV file will play but at the end,
|
406 |
|
|
--some players will display an error saying something like "Early EOF" or "Corrupted file".
|
407 |
|
|
|
408 |
|
|
--if (Compressing = '1' and EndCompression = '0') then
|
409 |
|
|
--SamplesInFile <= SamplesPerSec1 * SecondsToCompress2;
|
410 |
|
|
--else
|
411 |
|
|
if (LoadROM = '1') then
|
412 |
|
|
if (WAV_addr = "000000") then --file_size-8=SamplesInFile/2+52
|
413 |
|
|
--file size calculation is approximate, unless you want to mess up with floats
|
414 |
|
|
--or you have a fixed sampling rate (and want to modify the source code of this process)
|
415 |
|
|
SamplesInFile <= (('0' & SamplesPerSec1(15 downto 1)) * SecondsToCompress2) + x"34";
|
416 |
|
|
--SamplesInFile <= '0' & (SamplesInFile(31 downto 1) + x"34");
|
417 |
|
|
elsif (WAV_addr = "011101") then --get raw SamplesInFile
|
418 |
|
|
SamplesInFile <= SamplesPerSec1 * SecondsToCompress2;
|
419 |
|
|
elsif (WAV_addr = "110100") then --file_size-60=SamplesInFile/2
|
420 |
|
|
SamplesInFile <= '0' & SamplesInFile(31 downto 1);
|
421 |
|
|
end if;
|
422 |
|
|
end if;
|
423 |
|
|
--end if;
|
424 |
|
|
end if;
|
425 |
|
|
end process;
|
426 |
|
|
end Behavioral;
|
427 |
|
|
|