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{*****************************************************************************} |
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{ |
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This file is part of the Free Pascal's "Free Components Library". |
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Copyright (c) 2014 by Mazen NEIFER of the Free Pascal development team |
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and was adapted from wavopenal.pas copyright (c) 2010 Dmitry Boyarintsev. |
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RIFF/WAVE sound file writer implementation. |
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See the file COPYING.FPC, included in this distribution, |
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for details about the copyright. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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} |
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{ |
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This is a vendored version of the FPC fpWavWriter unit, which removes an |
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accidental debugging leftover, and explicitly removes range checks on |
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a misbehaving function. |
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} |
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unit htWaveWriter; |
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{$mode objfpc}{$H+} |
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interface |
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uses |
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fpWavFormat, |
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Classes; |
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type |
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{ TWaveReader } |
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{ TWavWriter } |
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TWavWriter = class(TObject) |
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private |
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fStream: TStream; |
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FFreeStreamOnClose: Boolean; |
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public |
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fmt: TWaveFormat; |
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destructor Destroy; override; |
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function CloseAudioFile: Boolean; |
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function FlushHeader: Boolean; |
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function StoreToFile(const FileName: string): Boolean; |
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function StoreToStream(AStream: TStream): Boolean; |
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function WriteBuf(var Buffer; BufferSize: Integer): Integer; |
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end; |
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implementation |
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uses |
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SysUtils; |
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procedure NtoLE(var fmt: TWaveFormat); overload; |
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begin |
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with fmt, ChunkHeader do begin |
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Size := NtoLE(Size); |
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Format := NtoLE(Format); |
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Channels := NtoLE(Channels); |
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SampleRate := NtoLE(SampleRate); |
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ByteRate := NtoLE(ByteRate); |
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BlockAlign := NtoLE(BlockAlign); |
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BitsPerSample := NtoLE(BitsPerSample); |
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end; |
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end; |
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{ TWaveWriter } |
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destructor TWavWriter.Destroy; |
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begin |
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CloseAudioFile; |
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inherited Destroy; |
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end; |
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function TWavWriter.CloseAudioFile: Boolean; |
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begin |
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Result := True; |
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if not Assigned(fStream) then begin |
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Exit(True); |
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end; |
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FlushHeader; |
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if FFreeStreamOnClose then begin |
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fStream.Free; |
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end; |
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end; |
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// This whole module should probably be rewritten (and contributed back to FPC) |
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// but for now, disable range checks in this routine |
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{$push}{$R-} |
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function TWavWriter.FlushHeader: Boolean; |
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var |
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riff: TRiffHeader; |
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fmtLE: TWaveFormat; |
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DataChunk: TChunkHeader; |
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Pos: Int64; |
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begin |
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Pos := fStream.Position; |
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with riff, ChunkHeader do begin |
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ID := AUDIO_CHUNK_ID_RIFF; |
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Size := NtoLE(Pos - SizeOf(ChunkHeader)); |
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Format := AUDIO_CHUNK_ID_WAVE; |
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end; |
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fmtLE := fmt; |
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NtoLE(fmtLE); |
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with fStream do begin |
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Position := 0; |
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Result := Write(riff, SizeOf(riff)) = SizeOf(riff); |
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Result := Write(fmtLE, sizeof(fmtLE)) = SizeOf(fmtLE); |
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end; |
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with DataChunk do begin |
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Id := AUDIO_CHUNK_ID_data; |
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Size := Pos - SizeOf(DataChunk) - fStream.Position; |
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end; |
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with fStream do begin |
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Result := Write(DataChunk, SizeOf(DataChunk)) = SizeOf(DataChunk); |
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end; |
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end; |
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{$pop} |
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function TWavWriter.StoreToFile(const FileName: string):Boolean; |
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begin |
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CloseAudioFile; |
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fStream := TFileStream.Create(FileName, fmCreate + fmOpenWrite); |
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if Assigned(fStream) then begin |
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Result := StoreToStream(fStream); |
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FFreeStreamOnClose := True; |
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end else begin |
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Result := False; |
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end; |
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end; |
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function TWavWriter.StoreToStream(AStream:TStream):Boolean; |
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begin |
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fStream := AStream; |
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FFreeStreamOnClose := False; |
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with fmt, ChunkHeader do begin |
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ID := AUDIO_CHUNK_ID_fmt; |
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Size := SizeOf(fmt) - SizeOf(ChunkHeader); |
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Format := AUDIO_FORMAT_PCM; |
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end; |
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Result := FlushHeader; |
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end; |
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function TWavWriter.WriteBuf(var Buffer; BufferSize: Integer): Integer; |
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var |
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sz: Integer; |
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begin |
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Result := 0; |
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with fStream do begin |
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sz := Write(Buffer, BufferSize); |
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if sz < 0 then Exit; |
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Inc(Result, sz); |
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end; |
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end; |
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end. |
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