1 files changed, 242 insertions, 0 deletions
diff --git a/src/classes/UAudioDecoder_Bass.pas b/src/classes/UAudioDecoder_Bass.pas
new file mode 100644
index 00000000..dba1fde4
--- /dev/null
+++ b/src/classes/UAudioDecoder_Bass.pas
@@ -0,0 +1,242 @@
+unit UAudioDecoder_Bass;
+
+interface
+
+{$IFDEF FPC}
+  {$MODE Delphi}
+{$ENDIF}
+
+{$I switches.inc}
+
+implementation
+
+uses
+  Classes,
+  SysUtils,
+  UMain,
+  UMusic,
+  UAudioCore_Bass,
+  ULog,
+  bass;
+
+type
+  TBassDecodeStream = class(TAudioDecodeStream)
+    private
+      Handle: HSTREAM;
+      FormatInfo : TAudioFormatInfo;
+      Error: boolean;
+    public
+      constructor Create(Handle: HSTREAM);
+      destructor Destroy(); override;
+
+      procedure Close();                     override;
+
+      function GetLength(): real;            override;
+      function GetAudioFormatInfo(): TAudioFormatInfo; override;
+      function GetPosition: real;            override;
+      procedure SetPosition(Time: real);     override;
+      function GetLoop(): boolean;           override;
+      procedure SetLoop(Enabled: boolean);   override;
+      function IsEOF(): boolean;             override;
+      function IsError(): boolean;           override;
+
+      function ReadData(Buffer: PChar; BufSize: integer): integer; override;
+  end;
+
+type
+  TAudioDecoder_Bass = class( TInterfacedObject, IAudioDecoder )
+    public
+      function GetName: string;
+
+      function InitializeDecoder(): boolean;
+      function FinalizeDecoder(): boolean;
+      function Open(const Filename: string): TAudioDecodeStream;
+  end;
+
+var
+  BassCore: TAudioCore_Bass;
+
+
+{ TBassDecodeStream }
+
+constructor TBassDecodeStream.Create(Handle: HSTREAM);
+var
+  ChannelInfo: BASS_CHANNELINFO;
+  Format: TAudioSampleFormat;
+begin
+  inherited Create();
+  Self.Handle := Handle;
+
+  // setup format info
+  if (not BASS_ChannelGetInfo(Handle, ChannelInfo)) then
+  begin
+    raise Exception.Create('Failed to open decode-stream');
+  end;
+  BassCore.ConvertBASSFlagsToAudioFormat(ChannelInfo.flags, Format);
+  FormatInfo := TAudioFormatInfo.Create(ChannelInfo.chans, ChannelInfo.freq, format);
+
+  Error := false;
+end;
+
+destructor TBassDecodeStream.Destroy();
+begin
+  Close();
+  inherited;
+end;
+
+procedure TBassDecodeStream.Close();
+begin
+  if (Handle <> 0) then
+  begin
+    BASS_StreamFree(Handle);
+    Handle := 0;
+  end;
+  PerformOnClose();
+  FreeAndNil(FormatInfo);
+  Error := false;
+end;
+
+function TBassDecodeStream.GetAudioFormatInfo(): TAudioFormatInfo;
+begin
+  Result := FormatInfo;
+end;
+
+function TBassDecodeStream.GetLength(): real;
+var
+  bytes: QWORD;
+begin
+  bytes  := BASS_ChannelGetLength(Handle, BASS_POS_BYTE);
+  Result := BASS_ChannelBytes2Seconds(Handle, bytes);
+end;
+
+function TBassDecodeStream.GetPosition: real;
+var
+  bytes: QWORD;
+begin
+  bytes  := BASS_ChannelGetPosition(Handle, BASS_POS_BYTE);
+  Result := BASS_ChannelBytes2Seconds(Handle, bytes);
+end;
+
+procedure TBassDecodeStream.SetPosition(Time: real);
+var
+  bytes: QWORD;
+begin
+  bytes := BASS_ChannelSeconds2Bytes(Handle, Time);
+  BASS_ChannelSetPosition(Handle, bytes, BASS_POS_BYTE);
+end;
+
+function TBassDecodeStream.GetLoop(): boolean;
+var
+  flags: DWORD;
+begin
+  // retrieve channel flags
+  flags := BASS_ChannelFlags(Handle, 0, 0);
+  if (flags = DWORD(-1)) then
+  begin
+    Log.LogError('BASS_ChannelFlags: ' + BassCore.ErrorGetString(), 'TBassDecodeStream.GetLoop');
+    Result := false;
+    Exit;
+  end;
+  Result := (flags and BASS_SAMPLE_LOOP) <> 0;
+end;
+
+procedure TBassDecodeStream.SetLoop(Enabled: boolean);
+var
+  flags: DWORD;
+begin
+  // set/unset loop-flag
+  if (Enabled) then
+    flags := BASS_SAMPLE_LOOP
+  else
+    flags := 0;
+
+  // set new flag-bits
+  if (BASS_ChannelFlags(Handle, flags, BASS_SAMPLE_LOOP) = DWORD(-1)) then
+  begin
+    Log.LogError('BASS_ChannelFlags: ' + BassCore.ErrorGetString(), 'TBassDecodeStream.SetLoop');
+    Exit;
+  end;
+end;
+
+function TBassDecodeStream.IsEOF(): boolean;
+begin
+  Result := (BASS_ChannelIsActive(Handle) = BASS_ACTIVE_STOPPED);
+end;
+
+function TBassDecodeStream.IsError(): boolean;
+begin
+  Result := Error;
+end;
+
+function TBassDecodeStream.ReadData(Buffer: PChar; BufSize: integer): integer;
+begin
+  Result := BASS_ChannelGetData(Handle, Buffer, BufSize);
+  // check error state (do not handle EOF as error)
+  if ((Result = -1) and (BASS_ErrorGetCode() <> BASS_ERROR_ENDED)) then
+    Error := true
+  else
+    Error := false;
+end;
+
+
+{ TAudioDecoder_Bass }
+
+function TAudioDecoder_Bass.GetName: String;
+begin
+  result := 'BASS_Decoder';
+end;
+
+function TAudioDecoder_Bass.InitializeDecoder(): boolean;
+begin
+  BassCore := TAudioCore_Bass.GetInstance();
+  Result := true;
+end;
+
+function TAudioDecoder_Bass.FinalizeDecoder(): boolean;
+begin
+  Result := true;
+end;
+
+function TAudioDecoder_Bass.Open(const Filename: string): TAudioDecodeStream;
+var
+  Stream: HSTREAM;
+  ChannelInfo: BASS_CHANNELINFO;
+  FileExt: string;
+begin
+  Result := nil;
+
+  // check if BASS was initialized
+  // in case the decoder is not used with BASS playback, init the NO_SOUND device
+  if ((integer(BASS_GetDevice) = -1) and (BASS_ErrorGetCode() = BASS_ERROR_INIT)) then
+    BASS_Init(0, 44100, 0, 0, nil);
+
+  // TODO: use BASS_STREAM_PRESCAN for accurate seeking in VBR-files?
+  //       disadvantage: seeking will slow down.
+  Stream := BASS_StreamCreateFile(False, PChar(Filename), 0, 0, BASS_STREAM_DECODE);
+  if (Stream = 0) then
+  begin
+    //Log.LogError(BassCore.ErrorGetString(), 'TAudioDecoder_Bass.Open');
+    Exit;
+  end;
+
+  // check if BASS opened some erroneously recognized file-formats
+  if BASS_ChannelGetInfo(Stream, channelInfo) then
+  begin
+    fileExt := ExtractFileExt(Filename);
+    // BASS opens FLV-files (maybe others too) although it cannot handle them.
+    // Setting BASS_CONFIG_VERIFY to the max. value (100000) does not help.
+    if ((fileExt = '.flv') and (channelInfo.ctype = BASS_CTYPE_STREAM_MP1)) then
+    begin
+      BASS_StreamFree(Stream);
+      Exit;
+    end;
+  end;
+
+  Result := TBassDecodeStream.Create(Stream);
+end;
+
+
+initialization
+  MediaManager.Add(TAudioDecoder_Bass.Create);
+
+end.