audio converter plugin interface added

git-svn-id: svn://svn.code.sf.net/p/ultrastardx/svn/branches/experimental@2703 b956fd51-792f-4845-bead-9b4dfca2ff2c

1 files changed, 183 insertions, 0 deletions

diff --git a/mediaplugin/src/media/UAudioConverterPlugin.pas b/mediaplugin/src/media/UAudioConverterPlugin.pas
new file mode 100644
index 00000000..389681ad
--- /dev/null
+++ b/mediaplugin/src/media/UAudioConverterPlugin.pas
@@ -0,0 +1,183 @@
+{* UltraStar Deluxe - Karaoke Game
+ *
+ * UltraStar Deluxe is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ *}
+
+unit UAudioConverterPlugin;
+
+interface
+
+{$IFDEF FPC}
+  {$MODE Delphi}
+{$ENDIF}
+
+{$I switches.inc}
+
+uses
+  UMusic,
+  ULog,
+  ctypes,
+  UMediaPlugin,
+  SysUtils;
+
+type
+  TAudioConverterPlugin = class(TInterfacedObject, IAudioConverter)
+    private
+      fPluginInfo: PMediaPluginInfo;
+    public
+      constructor Create(Info: PMediaPluginInfo);
+
+      function GetName(): string;
+      function GetPriority(): integer;
+      function Init(): boolean;
+      function Finalize(): boolean;
+
+      function Open(SrcFormatInfo: TAudioFormatInfo;
+                    DstFormatInfo: TAudioFormatInfo): TAudioConvertStream;
+  end;
+
+  TPluginAudioConvertStream = class(TAudioConvertStream)
+    private
+      fPluginInfo: PMediaPluginInfo;
+      fAudioConverter: PAudioConverterInfo;
+      fStream: PAudioConvertStream;
+      function Init(): boolean;
+    protected
+      constructor Create(SrcFormatInfo: TAudioFormatInfo;
+                    DstFormatInfo: TAudioFormatInfo);
+    public
+      destructor Destroy(); override;
+
+      class function Open(SrcFormatInfo: TAudioFormatInfo;
+                    DstFormatInfo: TAudioFormatInfo): TPluginAudioConvertStream;
+
+      function Convert(InputBuffer: PByteArray; OutputBuffer: PByteArray; var InputSize: integer): integer; override;
+      function GetOutputBufferSize(InputSize: integer): integer; override;
+      function GetRatio(): double; override;
+  end;
+
+implementation
+
+{ TAudioConverterPlugin }
+
+constructor TAudioConverterPlugin.Create(Info: PMediaPluginInfo);
+begin
+  inherited Create();
+  fPluginInfo := Info;
+end;
+
+function TAudioConverterPlugin.GetName(): string;
+begin
+  Result := 'Plugin:AudioConverter:' + fPluginInfo.name;
+end;
+
+function TAudioConverterPlugin.GetPriority(): integer;
+begin
+  Result := fPluginInfo.audioDecoder.priority;
+end;
+
+function TAudioConverterPlugin.Init(): boolean;
+begin
+  //fPluginInfo.initialize();
+  Result := true;
+end;
+
+function TAudioConverterPlugin.Finalize(): boolean;
+begin
+  //fPluginInfo.finalize();
+  Result := true;
+end;
+
+function TAudioConverterPlugin.Open(SrcFormatInfo: TAudioFormatInfo;
+  DstFormatInfo: TAudioFormatInfo): TAudioConvertStream;
+begin
+  Result := TPluginAudioConvertStream.Open(SrcFormatInfo, DstFormatInfo);
+end;
+
+{ TAudioConverterPlugin }
+
+constructor TPluginAudioConvertStream.Create(SrcFormatInfo: TAudioFormatInfo;
+  DstFormatInfo: TAudioFormatInfo);
+begin
+  inherited Create(SrcFormatInfo, DstFormatInfo);
+end;
+
+destructor TPluginAudioConvertStream.Destroy();
+begin
+  if (fStream <> nil) then
+    fAudioConverter.close(fStream);
+  inherited;
+end;
+
+class function TPluginAudioConvertStream.Open(SrcFormatInfo: TAudioFormatInfo;
+  DstFormatInfo: TAudioFormatInfo): TPluginAudioConvertStream;
+var
+  Stream: TPluginAudioConvertStream;
+begin
+  Result := nil;
+  Stream := TPluginAudioConvertStream.Create(SrcFormatInfo, DstFormatInfo);
+  if (not Stream.Init()) then
+  begin
+    Stream.Free;
+    Exit;
+  end;
+  Result := Stream;
+end;
+
+function TPluginAudioConvertStream.Init(): boolean;
+var
+  CSrcFormatInfo: TCAudioFormatInfo;
+  CDstFormatInfo: TCAudioFormatInfo;
+begin
+  Result := false;
+  fAudioConverter := fPluginInfo.audioConverter;
+
+  AudioFormatInfoToCStruct(SrcFormatInfo, CSrcFormatInfo);
+  AudioFormatInfoToCStruct(DstFormatInfo, CDstFormatInfo);
+  fStream := fAudioConverter.open(@CSrcFormatInfo, @CDstFormatInfo);
+  if (fStream = nil) then
+  begin
+    Log.LogError('fAudioConverter.open() failed', 'TAudioConverterPlugin.Init');
+    Exit;
+  end;
+
+  Result := true;
+end;
+
+function TPluginAudioConvertStream.Convert(InputBuffer: PByteArray; OutputBuffer: PByteArray; var InputSize: integer): integer;
+begin
+  Result := fAudioConverter.convert(fStream,
+      PCuint8(InputBuffer), PCuint8(OutputBuffer), @InputSize);
+end;
+
+function TPluginAudioConvertStream.GetOutputBufferSize(InputSize: integer): integer;
+begin
+  Result := fAudioConverter.getOutputBufferSize(fStream, InputSize);
+end;
+
+function TPluginAudioConvertStream.GetRatio(): double;
+begin
+  Result := fAudioConverter.getRatio(fStream);
+end;
+
+end.
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