关于怎样获取wav信息
如wav的比特率，采样率，声道，时长等等 问题点数：0、回复次数：3Top
1 楼reallike（爱翔)(学得太多，得休息一下）回复于 2004-09-03 17:57:45 得分 0
据风流倜傥的Kingron搜索到的是如下：
wave文件格式说明
unit LinearSystem;
interface
{============== WAV Format Coding Type ==================}
type WAVHeader = record
nChannels : Word;
nBitsPerSample : LongInt;
nSamplesPerSec : LongInt;
nAvgBytesPerSec : LongInt;
RIFFSize : LongInt;
fmtSize : LongInt;
formatTag : Word;
nBlockAlign : LongInt;
DataSize : LongInt;
end;
{============== Sample DataStreams ========================}
const MaxN = 300; { max number of sample values }
type SampleIndex = 0 .. MaxN+3;
type DataStream = array[ SampleIndex ] of Real;
var N : SampleIndex;
{============== Observation Variables ======================}
type Observation = record
Name : String[40]; {Name of this observat
ion}
yyy : DataStream; {Array of data points}
WAV : WAVHeader; {WAV specs for observa
tion}
Last : SampleIndex;{Last valid index to y
yy}
MinO, MaxO : Real; {Range values from yyy
}
end;
var K0R, K1R, K2R, K3R : Observation;
K0B, K1B, K2B, K3B : Observation;
{================== File Name Variables ===================}
var StandardDatabase : String[ 80 ];
BaseFileName : String[ 80 ];
StandardOutput : String[ 80 ];
StandardInput : String[ 80 ];
{=============== Operations ==================}
procedure ReadWAVFile (var Ki, Kj : Observation);
procedure WriteWAVFile(var Ki, Kj : Observation);
procedure ScaleData (var Kk : Observation);
procedure InitAllSignals;
procedure InitLinearSystem;
implementation
{$R *.DFM}
uses VarGraph, SysUtils;
{================== Standard WAV File Format ===================}
const MaxDataSize : LongInt = (MaxN+1)*2*2;
const MaxRIFFSize : LongInt = (MaxN+1)*2*2+36;
const StandardWAV : WAVHeader = (
nChannels : Word(2);
nBitsPerSample : LongInt(16);
nSamplesPerSec : LongInt(8000);
nAvgBytesPerSec : LongInt(32000);
RIFFSize : LongInt((MaxN+1)*2*2+36);
fmtSize : LongInt(16);
formatTag : Word(1);
nBlockAlign : LongInt(4);
DataSize : LongInt((MaxN+1)*2*2)
);
{================== Scale Observation Data ===================}
procedure ScaleData(var Kk : Observation);
var I : SampleIndex;
begin
{Initialize the scale values}
Kk.MaxO := Kk.yyy[0];
Kk.MinO := Kk.yyy[0];
{Then scan for any higher or lower values}
for I := 1 to Kk.Last do
begin
if Kk.MaxO < Kk.yyy[I] then Kk.MaxO := Kk.yyy[I];
if Kk.MinO > Kk.yyy[I] then Kk.MinO := Kk.yyy[I];
end;
end; { ScaleData }
procedure ScaleAllData;
begin
ScaleData(K0R);
ScaleData(K0B);
ScaleData(K1R);
ScaleData(K1B);
ScaleData(K2R);
ScaleData(K2B);
ScaleData(K3R);
ScaleData(K3B);
end; {ScaleAllData}
{================== WAV Data I/O ===================}
VAR InFile, OutFile : file of Byte;
type Tag = (F0, T1, M1);
type FudgeNum = record
case X:Tag of
F0 : (chrs : array[0..3] of Byte);
T1 : (lint : LongInt);
M1 : (up,dn: Integer);
end;
var ChunkSize : FudgeNum;
procedure WriteChunkName(Name:String);
var i : Integer;
MM : Byte;
begin
for i := 1 to 4 do
begin
MM := ord(Name[i]);
write(OutFile,MM);
end;
end; {WriteChunkName}
procedure WriteChunkSize(LL:Longint);
var I : integer;
begin
ChunkSize.x:=T1;
ChunkSize.lint:=LL;
ChunkSize.x:=F0;
for I := 0 to 3 do Write(OutFile,ChunkSize.chrs[I]);
end;
procedure WriteChunkWord(WW:Word);
var I : integer;
begin
ChunkSize.x:=T1;
ChunkSize.up:=WW;
ChunkSize.x:=M1;
for I := 0 to 1 do Write(OutFile,ChunkSize.chrs[I]);
end; {WriteChunkWord}
procedure WriteOneDataBlock(var Ki, Kj : Observation);
var I : Integer;
begin
ChunkSize.x:=M1;
with Ki.WAV do
begin
case nChannels of
1:if nBitsPerSample=16
then begin {1..2 16-bit samples in buffer for one channel}
ChunkSize.up := trunc(Ki.yyy[N]+0.5);
if N .5);
N := N+2;
end
else begin {1..4 8-bit samples in buffer for one channel}
for I:=0 to 3 do ChunkSize.chrs[I]
:= trunc(Ki.yyy[N+I]+0.5);
N := N+4;
end;
2:if nBitsPerSample=16
then begin {2 16-bit samples on two channels}
ChunkSize.dn := trunc(Ki.yyy[N]+0.5);
ChunkSize.up := trunc(Kj.yyy[N]+0.5);
N := N+1;
end
else begin {4 8-bit samples on two channels}
ChunkSize.chrs[1] := trunc(Ki.yyy[N]+0.5);
ChunkSize.chrs[3] := trunc(Ki.yyy[N+1]+0.5);
ChunkSize.chrs[0] := trunc(Kj.yyy[N]+0.5);
ChunkSize.chrs[2] := trunc(Kj.yyy[N+1]+0.5);
N := N+2;
end;
end; {with WAV do begin..}
end; {the four-byte variable "ChunkSize" has now been filled}
ChunkSize.x:=T1;
WriteChunkSize(ChunkSize.lint);{put 4 bytes of data}
end; {WriteOneDataBlock}
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2 楼reallike（爱翔)(学得太多，得休息一下）回复于 2004-09-03 17:58:04 得分 0
procedure WriteWAVFile(var Ki, Kj : Observation);
var MM : Byte;
I : Integer;
OK : Boolean;
begin
{Prepare to write a file of data}
AssignFile(OutFile, StandardOutput); { File selected in dialog }
ReWrite( OutFile );
With Ki.WAV do
begin DataSize := nChannels*(nBitsPerSample div 8)*(Ki.Last+1);
RIFFSize := DataSize+36;
fmtSize := 16;
end;
{Write ChunkName "RIFF"}
WriteChunkName('RIFF');
{Write ChunkSize}
WriteChunkSize(Ki.WAV.RIFFSize);
{Write ChunkName "WAVE"}
WriteChunkName('WAVE');
{Write tag "fmt_"}
WriteChunkName('fmt ');
{Write ChunkSize}
Ki.WAV.fmtSize := 16; {should be 16-18}
WriteChunkSize(Ki.WAV.fmtSize);
{Write formatTag, nChannels}
WriteChunkWord(Ki.WAV.formatTag);
WriteChunkWord(Ki.WAV.nChannels);
{Write nSamplesPerSec}
WriteChunkSize(Ki.WAV.nSamplesPerSec);
{Write nAvgBytesPerSec}
WriteChunkSize(Ki.WAV.nAvgBytesPerSec);
{Write nBlockAlign, nBitsPerSample}
WriteChunkWord(Ki.WAV.nBlockAlign);
WriteChunkWord(Ki.WAV.nBitsPerSample);
{WriteDataBlock tag "data"}
WriteChunkName('data');
{Write DataSize}
WriteChunkSize(Ki.WAV.DataSize);
N:=0; {first write-out location}
while N<=Ki.Last do WriteOneDataBlock(Ki,Kj); {put 4 bytes & incr
ement N}
{Free the file buffers}
CloseFile( OutFile );
end; {WriteWAVFile}
procedure InitSpecs;
begin
end; { InitSpecs }
procedure InitSignals(var Kk : Observation);
var J : Integer;
begin
for J := 0 to MaxN do Kk.yyy[J] := 0.0;
Kk.MinO := 0.0;
Kk.MaxO := 0.0;
Kk.Last := MaxN;
end; {InitSignals}
procedure InitAllSignals;
begin
InitSignals(K0R);
InitSignals(K0B);
InitSignals(K1R);
InitSignals(K1B);
InitSignals(K2R);
InitSignals(K2B);
InitSignals(K3R);
InitSignals(K3B);
end; {InitAllSignals}
var ChunkName : string[4];
procedure ReadChunkName;
var I : integer;
MM : Byte;
begin
ChunkName[0]:=chr(4);
for I := 1 to 4 do
begin
Read(InFile,MM);
ChunkName[I]:=chr(MM);
end;
end; {ReadChunkName}
procedure ReadChunkSize;
var I : integer;
MM : Byte;
begin
ChunkSize.x := F0;
ChunkSize.lint := 0;
for I := 0 to 3 do
begin
Read(InFile,MM);
ChunkSize.chrs[I]:=MM;
end;
ChunkSize.x := T1;
end; {ReadChunkSize}
procedure ReadOneDataBlock(var Ki,Kj:Observation);
var I : Integer;
begin
if N<=MaxN then
begin
ReadChunkSize; {get 4 bytes of data}
ChunkSize.x:=M1;
with Ki.WAV do
case nChannels of
1:if nBitsPerSample=16
then begin {1..2 16-bit samples in buffer for one channel}
Ki.yyy[N] :=1.0*ChunkSize.up;
if N N := N+2;
end
else begin {1..4 8-bit samples in buffer for one channel}
for I:=0 to 3 do Ki.yyy[N+I]:=1.0*ChunkSize.chrs[I
];
N := N+4;
end;
2:if nBitsPerSample=16
then begin {2 16-bit samples on two channels}
Ki.yyy[N]:=1.0*ChunkSize.dn;
Kj.yyy[N]:=1.0*ChunkSize.up;
N := N+1;
end
else begin {4 8-bit samples on two channels}
Ki.yyy[N] :=1.0*ChunkSize.chrs[1];
Ki.yyy[N+1]:=1.0*ChunkSize.chrs[3];
Kj.yyy[N] :=1.0*ChunkSize.chrs[0];
Kj.yyy[N+1]:=1.0*ChunkSize.chrs[2];
N := N+2;
end;
end;
if N<=MaxN then begin {LastN := N;}
Ki.Last := N;
if Ki.WAV.nChannels=2 then Kj.Last := N;
end
else begin {LastN := MaxN;}
Ki.Last := MaxN;
if Ki.WAV.nChannels=2 then Kj.Last := MaxN
;
end;
end;
end; {ReadOneDataBlock}
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3 楼reallike（爱翔)(学得太多，得休息一下）回复于 2004-09-03 17:58:11 得分 0
procedure ReadWAVFile(var Ki, Kj :Observation);
var MM : Byte;
I : Integer;
OK : Boolean;
NoDataYet : Boolean;
DataYet : Boolean;
nDataBytes : LongInt;
begin
if FileExists(StandardInput)
then
with Ki.WAV do
begin { Bring up open file dialog }
OK := True; {unless changed somewhere below}
{Prepare to read a file of data}
AssignFile(InFile, StandardInput); { File selected in dialog }
Reset( InFile );
{Read ChunkName "RIFF"}
ReadChunkName;
if ChunkName<>'RIFF' then OK := False;
{Read ChunkSize}
ReadChunkSize;
RIFFSize := ChunkSize.lint; {should be 18,678}
{Read ChunkName "WAVE"}
ReadChunkName;
if ChunkName<>'WAVE' then OK := False;
{Read ChunkName "fmt_"}
ReadChunkName;
if ChunkName<>'fmt ' then OK := False;
{Read ChunkSize}
ReadChunkSize;
fmtSize := ChunkSize.lint; {should be 18}
{Read formatTag, nChannels}
ReadChunkSize;
ChunkSize.x := M1;
formatTag := ChunkSize.up;
nChannels := ChunkSize.dn;
{Read nSamplesPerSec}
ReadChunkSize;
nSamplesPerSec := ChunkSize.lint;
{Read nAvgBytesPerSec}
ReadChunkSize;
nAvgBytesPerSec := ChunkSize.lint;
{Read nBlockAlign}
ChunkSize.x := F0;
ChunkSize.lint := 0;
for I := 0 to 3 do
begin Read(InFile,MM);
ChunkSize.chrs[I]:=MM;
end;
ChunkSize.x := M1;
nBlockAlign := ChunkSize.up;
{Read nBitsPerSample}
nBitsPerSample := ChunkSize.dn;
for I := 17 to fmtSize do Read(InFile,MM);
NoDataYet := True;
while NoDataYet do
begin
begin
{Read tag "data"}
ReadChunkName;
{Read DataSize}
ReadChunkSize;
DataSize := ChunkSize.lint;
if ChunkName<>'data' then
begin
for I := 1 to DataSize do {skip over any nondata stuff}
Read(InFile,MM);
end
else NoDataYet := False;
end;
nDataBytes := DataSize;
{Finally, start reading data for nDataBytes bytes}
if nDataBytes>0 then DataYet := True;
N:=0; {first read-in location}
while DataYet do
begin
ReadOneDataBlock(Ki,Kj); {get 4 bytes}
nDataBytes := nDataBytes-4;
if nDataBytes<=4 then DataYet := False;
end;
ScaleData(Ki);
if Ki.WAV.nChannels=2
then begin Kj.WAV := Ki.WAV;
ScaleData(Kj);
end;
{Free the file buffers}
CloseFile( InFile );
end
else begin
InitSpecs;{file does not exist}
InitSignals(Ki);{zero "Ki" array}
InitSignals(Kj);{zero "Kj" array}
end;
end; { ReadWAVFile }
{================= Database Operations ====================}
const MaxNumberOfDataBaseItems = 360;
type SignalDirectoryIndex = 0 .. MaxNumberOfDataBaseItems;
VAR DataBaseFile : file of Observation;
LastDataBaseItem : LongInt; {Current number of database items}
ItemNameS : array[SignalDirectoryIndex] of String[40];
procedure GetDatabaseItem( Kk : Observation; N : LongInt );
begin
if N<=LastDataBaseItem
then begin
Seek(DataBaseFile, N);
Read(DataBaseFile, Kk);
end
else InitSignals(Kk);
end; {GetDatabaseItem}
procedure PutDatabaseItem( Kk : Observation; N : LongInt );
begin
if N then
then
if N<=LastDataBaseItem
then begin
Seek(DataBaseFile, N);
Write(DataBaseFile, Kk);
LastDataBaseItem := LastDataBaseItem+1;
end
else while LastDataBaseItem<=N do
begin
Seek(DataBaseFile, LastDataBaseItem);
Write(DataBaseFile, Kk);
LastDataBaseItem := LastDataBaseItem+1;
end
else ReportError(1); {Attempt to read beyond MaxNumberOfDataBaseItems
}
end; {PutDatabaseItem}
procedure InitDataBase;
begin
LastDataBaseItem := 0;
if FileExists(StandardDataBase)
then
begin
begin
Assign(DataBaseFile,StandardDataBase);
Reset(DataBaseFile);
while not EOF(DataBaseFile) do
begin
GetDataBaseItem(K0R, LastDataBaseItem);
ItemNameS[LastDataBaseItem] := K0R.Name;
LastDataBaseItem := LastDataBaseItem+1;
end;
if EOF(DataBaseFile)
then if LastDataBaseItem>0
then LastDataBaseItem := LastDataBaseItem-1;
end;
end; {InitDataBase}
function FindDataBaseName( Nstg : String ):LongInt;
var ThisOne : LongInt;
begin
ThisOne := 0;
FindDataBaseName := -1;
while ThisOne begin
if Nstg=ItemNameS[ThisOne]
then begin
FindDataBaseName := ThisOne;
Exit;
end;
ThisOne := ThisOne+1;
end;
end; {FindDataBaseName}
{======================= Init Unit ========================}
procedure InitLinearSystem;
begin
BaseFileName := '\PROGRA~1\SIGNAL~1\';
StandardOutput := BaseFileName + 'K0.wav';
StandardInput := BaseFileName + 'K0.wav';
StandardDataBase := BaseFileName + 'Radar.sdb';
InitAllSignals;
InitDataBase;
ReadWAVFile(K0R,K0B);
ScaleAllData;
end; {InitLinearSystem}
begin {unit initialization code}
InitLinearSystem;
end. {Unit LinearSystem}
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