From e5f7b9f18641141354f03e6a8281a347a2555927 Mon Sep 17 00:00:00 2001
From: tobigun <tobigun@b956fd51-792f-4845-bead-9b4dfca2ff2c>
Date: Sat, 30 Oct 2010 07:34:30 +0000
Subject: dynamic loading of video- and audio-decoder

git-svn-id: svn://svn.code.sf.net/p/ultrastardx/svn/branches/experimental@2695 b956fd51-792f-4845-bead-9b4dfca2ff2c
---
 mediaplugin/src/media/UAudioConverter.pas      | 15 +++++
 mediaplugin/src/media/UAudioDecoder_FFmpeg.pas | 83 ++++++++++++------------
 mediaplugin/src/media/UMediaPlugin.pas         | 90 ++++++++++++++++++++------
 mediaplugin/src/media/UVideoDecoder_FFmpeg.pas | 88 ++++++++++++-------------
 4 files changed, 169 insertions(+), 107 deletions(-)

(limited to 'mediaplugin/src/media')

diff --git a/mediaplugin/src/media/UAudioConverter.pas b/mediaplugin/src/media/UAudioConverter.pas
index aa3e343e..f2388b8f 100644
--- a/mediaplugin/src/media/UAudioConverter.pas
+++ b/mediaplugin/src/media/UAudioConverter.pas
@@ -194,6 +194,21 @@ end;
 
 {$IFDEF UseFFmpegResample}
 
+const
+{$IFDEF MSWINDOWS}
+  ffmpegPlugin = 'ffmpeg_playback.dll';
+{$ENDIF}
+{$IFDEF LINUX}
+  ffmpegPlugin = 'ffmpeg_playback';
+{$ENDIF}
+{$IFDEF DARWIN}
+  ffmpegPlugin = 'ffmpeg_playback.dylib';
+  {$linklib ffmpegPlugin}
+{$ENDIF}
+
+function Plugin_register(core: PMediaPluginCore): PMediaPluginInfo;
+  cdecl; external ffmpegPlugin;
+
 function TAudioConverter_FFmpeg.Init(SrcFormatInfo: TAudioFormatInfo; DstFormatInfo: TAudioFormatInfo): boolean;
 var
   CSrcFormatInfo: TCAudioFormatInfo;
diff --git a/mediaplugin/src/media/UAudioDecoder_FFmpeg.pas b/mediaplugin/src/media/UAudioDecoder_FFmpeg.pas
index 2865a7d8..6047cdd6 100644
--- a/mediaplugin/src/media/UAudioDecoder_FFmpeg.pas
+++ b/mediaplugin/src/media/UAudioDecoder_FFmpeg.pas
@@ -44,28 +44,45 @@ interface
 
 {$I switches.inc}
 
+uses
+  UMediaPlugin,
+  UMusic,
+  UPath;
+
+type
+  TAudioDecoder_FFmpeg = class(TInterfacedObject, IAudioDecoder)
+    private
+      fPluginInfo: PMediaPluginInfo;
+    public
+      constructor Create(Info: PMediaPluginInfo);
+
+      function GetName: string;
+
+      function InitializeDecoder(): boolean;
+      function FinalizeDecoder(): boolean;
+      function Open(const Filename: IPath): TAudioDecodeStream;
+  end;
+
 implementation
 
 uses
   ctypes,
   Classes,
   SysUtils,
-  UMediaPlugin,
-  UMusic,
   UIni,
   UMain,
-  ULog,
-  UPath;
+  ULog;
 
 type
   TFFmpegDecodeStream = class(TAudioDecodeStream)
     private
+      fAudioDecoderInfo: PAudioDecoderInfo;
       fFilename: IPath;
       fStream: PAudioDecodeStream;
       fFormatInfo: TAudioFormatInfo;
 
     public
-      constructor Create();
+      constructor Create(Info: PAudioDecoderInfo);
       destructor Destroy(); override;
 
       function Open(const Filename: IPath): boolean;
@@ -83,28 +100,12 @@ type
       function ReadData(Buffer: PByteArray; BufferSize: integer): integer; override;
   end;
 
-type
-  TAudioDecoder_FFmpeg = class(TInterfacedObject, IAudioDecoder)
-    private
-      fPluginInfo: PMediaPluginInfo;
-    public
-      constructor Create();
-
-      function GetName: string;
-
-      function InitializeDecoder(): boolean;
-      function FinalizeDecoder(): boolean;
-      function Open(const Filename: IPath): TAudioDecodeStream;
-  end;
-
-var
-  AudioDecoderInfo: PAudioDecoderInfo;
-
 { TFFmpegDecodeStream }
 
-constructor TFFmpegDecodeStream.Create();
+constructor TFFmpegDecodeStream.Create(Info: PAudioDecoderInfo);
 begin
   inherited Create();
+  fAudioDecoderInfo := Info;
   fFilename := PATH_NONE;
 end;
 
@@ -125,13 +126,13 @@ begin
 
   Close();
 
-  fStream := AudioDecoderInfo.open(PChar(Filename.ToUTF8()));
+  fStream := fAudioDecoderInfo.open(PChar(Filename.ToUTF8()));
   if (fStream = nil) then
     Exit;
 
   fFilename := Filename;
 
-  AudioDecoderInfo.getAudioFormatInfo(fStream, Info);
+  fAudioDecoderInfo.getAudioFormatInfo(fStream, Info);
   fFormatInfo := TAudioFormatInfo.Create(
     Info.channels,
     Info.sampleRate,
@@ -146,14 +147,14 @@ begin
   Self.fFilename := PATH_NONE;
   if (fStream <> nil) then
   begin
-    AudioDecoderInfo.close(fStream);
+    fAudioDecoderInfo.close(fStream);
     fStream := nil;
   end;
 end;
 
 function TFFmpegDecodeStream.GetLength(): real;
 begin
-  Result := AudioDecoderInfo.getLength(fStream);
+  Result := fAudioDecoderInfo.getLength(fStream);
 end;
 
 function TFFmpegDecodeStream.GetAudioFormatInfo(): TAudioFormatInfo;
@@ -163,46 +164,46 @@ end;
 
 function TFFmpegDecodeStream.IsEOF(): boolean;
 begin
-  Result := AudioDecoderInfo.isEOF(fStream);
+  Result := fAudioDecoderInfo.isEOF(fStream);
 end;
 
 function TFFmpegDecodeStream.IsError(): boolean;
 begin
-  Result := AudioDecoderInfo.isError(fStream);
+  Result := fAudioDecoderInfo.isError(fStream);
 end;
 
 function TFFmpegDecodeStream.GetPosition(): real;
 begin
-  Result := AudioDecoderInfo.getPosition(fStream);
+  Result := fAudioDecoderInfo.getPosition(fStream);
 end;
 
 procedure TFFmpegDecodeStream.SetPosition(Time: real);
 begin
-  AudioDecoderInfo.setPosition(fStream, Time);
+  fAudioDecoderInfo.setPosition(fStream, Time);
 end;
 
 function TFFmpegDecodeStream.GetLoop(): boolean;
 begin
-  Result := AudioDecoderInfo.getLoop(fStream);
+  Result := fAudioDecoderInfo.getLoop(fStream);
 end;
 
 procedure TFFmpegDecodeStream.SetLoop(Enabled: boolean);
 begin
-  AudioDecoderInfo.setLoop(fStream, Enabled);
+  fAudioDecoderInfo.setLoop(fStream, Enabled);
 end;
 
 function TFFmpegDecodeStream.ReadData(Buffer: PByteArray; BufferSize: integer): integer;
 begin
-  Result := AudioDecoderInfo.readData(fStream, PCUint8(Buffer), BufferSize);
+  Result := fAudioDecoderInfo.readData(fStream, PCUint8(Buffer), BufferSize);
 end;
 
 
 { TAudioDecoder_FFmpeg }
 
-constructor TAudioDecoder_FFmpeg.Create();
+constructor TAudioDecoder_FFmpeg.Create(Info: PMediaPluginInfo);
 begin
   inherited Create();
-  fPluginInfo := Plugin_register(MediaPluginCore);
+  fPluginInfo := Info;
 end;
 
 function TAudioDecoder_FFmpeg.GetName: String;
@@ -212,14 +213,13 @@ end;
 
 function TAudioDecoder_FFmpeg.InitializeDecoder: boolean;
 begin
-  fPluginInfo.initialize();
-  AudioDecoderInfo := fPluginInfo.audioDecoder;
+  //fPluginInfo.initialize();
   Result := true;
 end;
 
 function TAudioDecoder_FFmpeg.FinalizeDecoder(): boolean;
 begin
-  fPluginInfo.finalize();
+  //fPluginInfo.finalize();
   Result := true;
 end;
 
@@ -229,7 +229,7 @@ var
 begin
   Result := nil;
 
-  Stream := TFFmpegDecodeStream.Create();
+  Stream := TFFmpegDecodeStream.Create(fPluginInfo.audioDecoder);
   if (not Stream.Open(Filename)) then
   begin
     Stream.Free;
@@ -239,7 +239,4 @@ begin
   Result := Stream;
 end;
 
-initialization
-  MediaManager.Add(TAudioDecoder_FFmpeg.Create);
-
 end.
diff --git a/mediaplugin/src/media/UMediaPlugin.pas b/mediaplugin/src/media/UMediaPlugin.pas
index 2eb0772e..0c0f7fb9 100644
--- a/mediaplugin/src/media/UMediaPlugin.pas
+++ b/mediaplugin/src/media/UMediaPlugin.pas
@@ -47,9 +47,9 @@ type
 
   PMediaPluginCore = ^TMediaPluginCore;
   TMediaPluginCore = record
-  	version: cint;
+    version: cint;
 
-	  log: procedure(level: cint; msg: PChar; context: PChar); cdecl;
+    log: procedure(level: cint; msg: PChar; context: PChar); cdecl;
     ticksMillis: function(): cuint32; cdecl;
 
     fileOpen: function(utf8Filename: PAnsiChar; mode: cint): PFileStream; cdecl;
@@ -138,23 +138,9 @@ type
     videoDecoder: PVideoDecoderInfo;
   end;
 
-  Plugin_registerFunc = function(core: PMediaPluginCore): PMediaPluginInfo; cdecl;
-
-const
-{$IFDEF MSWINDOWS}
-  ffmpegPlugin = 'ffmpeg_playback.dll';
-{$ENDIF}
-{$IFDEF LINUX}
-  ffmpegPlugin = 'ffmpeg_playback';
-{$ENDIF}
-{$IFDEF DARWIN}
-  ffmpegPlugin = 'ffmpeg_playback.dylib';
-  {$linklib ffmpegPlugin}
-{$ENDIF}
-
-function Plugin_register(core: PMediaPluginCore): PMediaPluginInfo;
-  cdecl; external ffmpegPlugin;
+  TPluginRegisterFunc = function(core: PMediaPluginCore): PMediaPluginInfo; cdecl;
 
+procedure LoadMediaPlugins();
 
 function MediaPluginCore: PMediaPluginCore;
 
@@ -164,8 +150,15 @@ procedure AudioFormatInfoToCStruct(
 implementation
 
 uses
+  SysUtils,
   SDL,
-  ULog;
+  moduleloader,
+  UFilesystem,
+  UPath,
+  UPathUtils,
+  ULog,
+  UAudioDecoder_FFmpeg,
+  UVideoDecoder_FFmpeg;
 
 var
   MediaPluginCore_Instance: TMediaPluginCore;
@@ -349,6 +342,65 @@ begin
   end;
 end;
 
+procedure LoadMediaPlugins();
+var
+  LibPath: IPath;
+  Iter: IFileIterator;
+  FileInfo: TFileInfo;
+  ModuleFile: IPath;
+  Module: TModuleHandle;
+  RegisterFunc: TPluginRegisterFunc;
+  PluginInfo: PMediaPluginInfo;
+begin
+  LibPath := MediaPluginPath.Append('*.dll');
+  Iter := FileSystem.FileFind(LibPath, faAnyFile);
+  while (Iter.HasNext) do
+  begin
+    FileInfo := Iter.Next();
+    ModuleFile := MediaPluginPath.Append(FileInfo.Name);
+    if (not LoadModule(Module, PChar(ModuleFile.ToNative))) then
+    begin
+      Log.LogInfo('Failed to load media plugin: "' + FileInfo.Name.ToNative + '"',
+          'LoadMediaPlugins');
+      Continue;
+    end;
+    RegisterFunc := GetModuleSymbol(Module, 'Plugin_register');
+    if (@RegisterFunc = nil) then
+    begin
+      Log.LogError('Invalid media plugin: "' + FileInfo.Name.ToNative + '"',
+          'LoadMediaPlugins');
+      UnloadModule(Module);
+      Continue;
+    end;
+    PluginInfo := RegisterFunc(MediaPluginCore);
+    if (PluginInfo = nil) then
+    begin
+      Log.LogError('Invalid media plugin info: "' + FileInfo.Name.ToNative + '"',
+          'LoadMediaPlugins');
+      UnloadModule(Module);
+      Continue;
+    end;
+    if (not PluginInfo.initialize()) then
+    begin
+      Log.LogError('Failed to initialize media plugin: "' + PluginInfo.name + '"',
+          'LoadMediaPlugins');
+      UnloadModule(Module);
+      Continue;
+    end;
+
+    Log.LogStatus('Loaded media plugin: "' + PluginInfo.name + '"',
+        'LoadMediaPlugins');
+    
+    // register modules
+    if (PluginInfo.audioDecoder <> nil) then
+      MediaManager.Add(TAudioDecoder_FFmpeg.Create(PluginInfo));
+    if (PluginInfo.videoDecoder <> nil) then
+      MediaManager.Add(TVideoDecoder_FFmpeg.Create(PluginInfo));
+    //if (PluginInfo.audioConverter <> nil) then
+    //  MediaManager.Add();
+  end;
+end;
+
 initialization
   InitializeMediaPluginCore;
 
diff --git a/mediaplugin/src/media/UVideoDecoder_FFmpeg.pas b/mediaplugin/src/media/UVideoDecoder_FFmpeg.pas
index 51916276..b8b72a9d 100644
--- a/mediaplugin/src/media/UVideoDecoder_FFmpeg.pas
+++ b/mediaplugin/src/media/UVideoDecoder_FFmpeg.pas
@@ -33,27 +33,45 @@ interface
 
 {$I switches.inc}
 
+uses
+  UMediaPlugin,
+  UMusic,
+  UPath;
+
+type
+  TVideoDecoder_FFmpeg = class( TInterfacedObject, IVideoDecoder )
+  private
+    fPluginInfo: PMediaPluginInfo;
+  public
+    constructor Create(Info: PMediaPluginInfo);
+
+    function GetName: String;
+
+    function InitializeDecoder(): boolean;
+    function FinalizeDecoder: boolean;
+
+    function Open(const FileName: IPath): TVideoDecodeStream;
+  end;
+
 implementation
 
 uses
   SysUtils,
   Math,
-  UMediaPlugin,
+  ctypes,
   UCommon,
   UConfig,
-  ULog,
-  UMusic,
-  UPath;
+  ULog;
 
 type
   TVideoDecodeStream_FFmpeg = class (TVideoDecodeStream)
   private
-    private
-      fFilename: IPath;
-      fStream: PVideoDecodeStream;
+    fVideoDecoderInfo: PVideoDecoderInfo;
+    fFilename: IPath;
+    fStream: PVideoDecodeStream;
 
   public
-    constructor Create;
+    constructor Create(Info: PVideoDecoderInfo);
     destructor Destroy; override;
 
     function Open(const FileName: IPath): boolean; override;
@@ -72,31 +90,14 @@ type
     function GetFrame(Time: Extended): PByteArray; override;
   end;
 
-  TVideoDecoder_FFmpeg = class( TInterfacedObject, IVideoDecoder )
-  private
-    fPluginInfo: PMediaPluginInfo;
-  public
-    constructor Create();
-
-    function GetName: String;
-
-    function InitializeDecoder(): boolean;
-    function FinalizeDecoder: boolean;
-
-    function Open(const FileName: IPath): TVideoDecodeStream;
-  end;
-
-var
-  VideoDecoderInfo: PVideoDecoderInfo;
-
 {*------------------------------------------------------------------------------
  * TVideoPlayback_ffmpeg
  *------------------------------------------------------------------------------}
 
-constructor TVideoDecoder_FFmpeg.Create();
+constructor TVideoDecoder_FFmpeg.Create(Info: PMediaPluginInfo);
 begin
   inherited Create();
-  fPluginInfo := Plugin_register(MediaPluginCore);
+  fPluginInfo := Info;
 end;
 
 function  TVideoDecoder_FFmpeg.GetName: String;
@@ -106,14 +107,13 @@ end;
 
 function TVideoDecoder_FFmpeg.InitializeDecoder(): boolean;
 begin
-  fPluginInfo.initialize();
-  VideoDecoderInfo := fPluginInfo.videoDecoder;
+  //fPluginInfo.initialize();
   Result := true;
 end;
 
 function TVideoDecoder_FFmpeg.FinalizeDecoder(): boolean;
 begin
-  fPluginInfo.finalize();
+  //fPluginInfo.finalize();
   Result := true;
 end;
 
@@ -123,7 +123,7 @@ var
 begin
   Result := nil;
 
-  Stream := TVideoDecodeStream_FFmpeg.Create;
+  Stream := TVideoDecodeStream_FFmpeg.Create(fPluginInfo.videoDecoder);
   if (not Stream.Open(FileName)) then
   begin
     Stream.Free;
@@ -136,9 +136,10 @@ end;
 
 {* TVideoDecoder_FFmpeg *}
 
-constructor TVideoDecodeStream_FFmpeg.Create;
+constructor TVideoDecodeStream_FFmpeg.Create(Info: PVideoDecoderInfo);
 begin
   inherited Create();
+  fVideoDecoderInfo := Info;
   fFilename := PATH_NONE;
 end;
 
@@ -154,7 +155,7 @@ begin
 
   Close();
 
-  fStream := VideoDecoderInfo.open(PChar(Filename.ToUTF8()));
+  fStream := fVideoDecoderInfo.open(PChar(Filename.ToUTF8()));
   if (fStream = nil) then
     Exit;
 
@@ -168,52 +169,49 @@ begin
   Self.fFilename := PATH_NONE;
   if (fStream <> nil) then
   begin
-    VideoDecoderInfo.close(fStream);
+    fVideoDecoderInfo.close(fStream);
     fStream := nil;
   end;
 end;
 
 function TVideoDecodeStream_FFmpeg.GetFrame(Time: Extended): PByteArray;
 begin
-  Result := PByteArray(VideoDecoderInfo.getFrame(fStream, Time));
+  Result := PByteArray(fVideoDecoderInfo.getFrame(fStream, Time));
 end;
 
 procedure TVideoDecodeStream_FFmpeg.SetLoop(Enable: boolean);
 begin
-  VideoDecoderInfo.setLoop(fStream, Enable);
+  fVideoDecoderInfo.setLoop(fStream, Enable);
 end;
 
 function TVideoDecodeStream_FFmpeg.GetLoop(): boolean;
 begin
-  Result := VideoDecoderInfo.getLoop(fStream);
+  Result := fVideoDecoderInfo.getLoop(fStream);
 end;
 
 procedure TVideoDecodeStream_FFmpeg.SetPosition(Time: real);
 begin
-  VideoDecoderInfo.setPosition(fStream, Time);
+  fVideoDecoderInfo.setPosition(fStream, Time);
 end;
 
 function  TVideoDecodeStream_FFmpeg.GetPosition: real;
 begin
-  Result := VideoDecoderInfo.getPosition(fStream);
+  Result := fVideoDecoderInfo.getPosition(fStream);
 end;
 
 function TVideoDecodeStream_FFmpeg.GetFrameWidth(): integer;
 begin
-  Result := VideoDecoderInfo.getFrameWidth(fStream);
+  Result := fVideoDecoderInfo.getFrameWidth(fStream);
 end;
 
 function TVideoDecodeStream_FFmpeg.GetFrameHeight(): integer;
 begin
-  Result := VideoDecoderInfo.getFrameHeight(fStream);
+  Result := fVideoDecoderInfo.getFrameHeight(fStream);
 end;
 
 function TVideoDecodeStream_FFmpeg.GetFrameAspect(): real;
 begin
-  Result := VideoDecoderInfo.getFrameAspect(fStream);
+  Result := fVideoDecoderInfo.getFrameAspect(fStream);
 end;
 
-initialization
-  MediaManager.Add(TVideoDecoder_FFmpeg.Create);
-
 end.
-- 
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