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iLbcCodec.pas
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{
publish with BSD Licence.
Copyright (c) Terry Lao
}
unit iLbcCodec;
interface
uses
C2Delphi_header,
SysUtils,windows,
anaFilters,
constants,
createCB,
doCPLC,
enhancers,
filter,
FrameClassifys,
gainquants,
getCBvecs,
helpfun,
hpInputs,
hpOutputs,
iCBConstructs,
iCBSearchs,
iLBC_decodes,
iLBC_define,
iLBC_encodes;
Const
ILBCNOOFWORDS_MAX = (NO_OF_BYTES_30MS div 2);
BITRATE_30MS = NO_OF_BYTES_30MS*8*8000/BLOCKL_30MS; //raw bits per second = BytesPerFrame * BitsPerSample*SamplesPerSec/SamplesPerFrame
BITRATE_20MS = NO_OF_BYTES_20MS*8*8000/BLOCKL_20MS;
var
data:array [0..BLOCKL_MAX-1] of Smallint;
encoded_data:array [0..ILBCNOOFWORDS_MAX-1] of Smallint;
decoded_data:array [0..BLOCKL_MAX-1] of Smallint;
pli, mode:Smallint;
{ Create structs }
Enc_Inst:iLBC_Enc_Inst_t;
Dec_Inst:iLBC_Dec_Inst_t;
function encode( { (o) Number of bytes encoded }
iLBCenc_inst:piLBC_Enc_Inst_t;
{ (i/o) Encoder instance }
encoded_data:PAshort; { (o) The encoded bytes }
encoded_DataByteSize:cardinal;
data:PAshort; { (i) The signal block to encode}
dataByteCount:cardinal
):cardinal;
function decode( { (o) Number of decoded samples }
iLBCdec_inst:piLBC_Dec_Inst_t; { (i/o) Decoder instance }
decoded_data:PAshort; { (o) Decoded signal block}
decodedBufByteSize:cardinal;
encoded_data:PAshort; { (i) Encoded bytes }
encodedByteCount:cardinal;
mode:Smallint { (i) 0:=PL, 1:=Normal }
):cardinal;
function encode_single( { (o) Number of bytes encoded }
iLBCenc_inst:piLBC_Enc_Inst_t;
{ (i/o) Encoder instance }
encoded_data:PAshort; { (o) The encoded bytes }
data:PAshort { (i) The signal block to encode}
):Smallint;
function decode_single( { (o) Number of decoded samples }
iLBCdec_inst:piLBC_Dec_Inst_t; { (i/o) Decoder instance }
decoded_data:PAshort; { (o) Decoded signal block}
encoded_data:PAshort; { (i) Encoded bytes }
mode:Smallint { (i) 0:=PL, 1:=Normal }
):Smallint;
implementation
function encode_single( { (o) Number of bytes encoded }
iLBCenc_inst:piLBC_Enc_Inst_t;
{ (i/o) Encoder instance }
encoded_data:PAshort; { (o) The encoded bytes }
data:PAshort { (i) The signal block to encode}
):Smallint;
var
block:array [0..BLOCKL_MAX-1] of real;
k:integer;
begin
{ convert signal to float }
for k:=0 to iLBCenc_inst^.blockl-1 do
block[k] := data[k];
{ do the actual encoding }
iLBC_encode(@encoded_data[0], @block, iLBCenc_inst);
result:= Smallint(iLBCenc_inst^.no_of_bytes);
end;
{----------------------------------------------------------------*
* Decoder interface function
*---------------------------------------------------------------}
function decode_single( { (o) Number of decoded samples }
iLBCdec_inst:piLBC_Dec_Inst_t; { (i/o) Decoder instance }
decoded_data:PAshort; { (o) Decoded signal block}
encoded_data:PAshort; { (i) Encoded bytes }
mode:Smallint { (i) 0:=PL, 1:=Normal }
):Smallint;
var
k:integer;
decblock:array [0..BLOCKL_MAX-1] of real;
dtmp:real;
begin
{ check if mode is valid }
if (mode<0) or (mode>1) then
begin
writeln(ErrOutput,'ERROR - Wrong mode - 0, 1 allowed');
result:=3;
exit;
end;
{ do actual decoding of block }
iLBC_decode(@decblock, @encoded_data[0], iLBCdec_inst, mode);
{ convert to short }
for k:=0 to iLBCdec_inst^.blockl-1 do
begin
dtmp:=decblock[k];
if (dtmp<MIN_SAMPLE) then
dtmp:=MIN_SAMPLE
else
if (dtmp>MAX_SAMPLE) then
dtmp:=MAX_SAMPLE;
decoded_data[k] := trunc(dtmp);
end;
result:= Smallint(iLBCdec_inst^.blockl);
end;
{----------------------------------------------------------------*
* Encoder interface function
*---------------------------------------------------------------}
function encode( { (o) Number of bytes encoded }
iLBCenc_inst:piLBC_Enc_Inst_t;
{ (i/o) Encoder instance }
encoded_data:PAshort; { (o) The encoded bytes }
encoded_DataByteSize:cardinal;
data:PAshort; { (i) The signal block to encode}
dataByteCount:cardinal
):cardinal;{回傳的是byte 數, 換成short int 要除 2}
var
block:array [0..BLOCKL_MAX-1] of real;
k,i,j:integer;
begin//240 個short int(480 bytes) 壓成25 個short int(50 個byte)
j:=dataByteCount div sizeof(short);
j:=j - (j mod iLBCenc_inst^.blockl);
i:=0;
result:=0;
while i<j do
begin
{ convert signal to float }
for k:=0 to iLBCenc_inst^.blockl-1 do
block[k] := data[k+i];
i:=i+iLBCenc_inst^.blockl;
{ do the actual encoding }
iLBC_encode(@encoded_data[result div 2], @block, iLBCenc_inst);
result:=result + Smallint(iLBCenc_inst^.no_of_bytes);
end;
j:=(dataByteCount div sizeof(short)) mod iLBCenc_inst^.blockl;
if j>0 then
begin
fillchar(block[0],BLOCKL_MAX*sizeof(real),0);
for k:=0 to j-1 do
block[k] := data[k+i];
iLBC_encode(@encoded_data[result div 2], @block, iLBCenc_inst);
result:=result + Smallint(iLBCenc_inst^.no_of_bytes);
end;
end;
{----------------------------------------------------------------*
* Decoder interface function
*---------------------------------------------------------------}
function decode( { (o) Number of decoded samples }
iLBCdec_inst:piLBC_Dec_Inst_t; { (i/o) Decoder instance }
decoded_data:PAshort; { (o) Decoded signal block}
decodedBufByteSize:cardinal;
encoded_data:PAshort; { (i) Encoded bytes }
encodedByteCount:cardinal;
mode:Smallint { (i) 0:=PL, 1:=Normal }
):cardinal;{return 的是short int 的數目, 換成byte 要乘 2}
var
k,i,j:integer;
decblock:array [0..BLOCKL_MAX-1] of real;
dtmp:real;
begin
{ check if mode is valid }
if (mode<0) or (mode>1) then
begin
result:=0;
exit;
end;
//50 個byte 即25 bytes --> 240 個short int即480 bytes
{ do actual decoding of block }
j:=encodedByteCount div 2;
i:=0;
result:=0;
while i<j do
begin
iLBC_decode(@decblock, @encoded_data[i], iLBCdec_inst, mode);
{ convert to short }
for k:=0 to iLBCdec_inst^.blockl-1 do
begin
dtmp:=decblock[k];
if (dtmp<MIN_SAMPLE) then
dtmp:=MIN_SAMPLE
else
if (dtmp>MAX_SAMPLE) then
dtmp:=MAX_SAMPLE;
decoded_data[k+result] := trunc(dtmp);
end;
inc(i,25);
result:=result + cardinal(iLBCdec_inst^.blockl);
end;
j:=encodedByteCount mod 50;
if j>0 then
begin
move(encoded_data[i],encoded_data[i-((50-j) div 2)],j);
fillchar(encoded_data[i+(j div 2)],(50-j) div 2,0);
iLBC_decode(@decblock, @encoded_data[i-((50-j) div 2)], iLBCdec_inst, mode);
{ convert to short }
for k:=0 to iLBCdec_inst^.blockl-1 do
begin
dtmp:=decblock[k];
if (dtmp<MIN_SAMPLE) then
dtmp:=MIN_SAMPLE
else
if (dtmp>MAX_SAMPLE) then
dtmp:=MAX_SAMPLE;
decoded_data[k+result] := trunc(dtmp);
end;
result:=result + cardinal(iLBCdec_inst^.blockl);
end;
end;
begin
initEncode(@Enc_Inst, 30);
initDecode(@Dec_Inst, 30, 1);
end.