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{* 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 UAudioDecoder_FFmpeg;
(*******************************************************************************
*
* This unit is primarily based upon -
* http://www.dranger.com/ffmpeg/ffmpegtutorial_all.html
*
* and tutorial03.c
*
* http://www.inb.uni-luebeck.de/~boehme/using_libavcodec.html
*
*******************************************************************************)
interface
{$IFDEF FPC}
{$MODE Delphi}
{$ENDIF}
{$I switches.inc}
implementation
uses
ctypes,
Classes,
SysUtils,
UMediaPlugin,
UMusic,
UIni,
UMain,
ULog,
UPath;
type
TFFmpegDecodeStream = class(TAudioDecodeStream)
private
fFilename: IPath;
fStream: PAudioDecodeStream;
fFormatInfo: TAudioFormatInfo;
public
constructor Create();
destructor Destroy(); override;
function Open(const Filename: IPath): boolean;
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: 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();
begin
inherited Create();
fFilename := PATH_NONE;
end;
{*
* Frees the decode-stream data.
*}
destructor TFFmpegDecodeStream.Destroy();
begin
Close();
inherited;
end;
function TFFmpegDecodeStream.Open(const Filename: IPath): boolean;
var
Info: TCAudioFormatInfo;
begin
Result := false;
Close();
fStream := AudioDecoderInfo.open(PChar(Filename.ToUTF8()));
if (fStream = nil) then
Exit;
fFilename := Filename;
AudioDecoderInfo.getAudioFormatInfo(fStream, Info);
fFormatInfo := TAudioFormatInfo.Create(
Info.channels,
Info.sampleRate,
TAudioSampleFormat(Info.format)
);
Result := true;
end;
procedure TFFmpegDecodeStream.Close();
begin
Self.fFilename := PATH_NONE;
if (fStream <> nil) then
begin
AudioDecoderInfo.close(fStream);
fStream := nil;
end;
end;
function TFFmpegDecodeStream.GetLength(): real;
begin
Result := AudioDecoderInfo.getLength(fStream);
end;
function TFFmpegDecodeStream.GetAudioFormatInfo(): TAudioFormatInfo;
begin
Result := fFormatInfo;
end;
function TFFmpegDecodeStream.IsEOF(): boolean;
begin
Result := AudioDecoderInfo.isEOF(fStream);
end;
function TFFmpegDecodeStream.IsError(): boolean;
begin
Result := AudioDecoderInfo.isError(fStream);
end;
function TFFmpegDecodeStream.GetPosition(): real;
begin
Result := AudioDecoderInfo.getPosition(fStream);
end;
procedure TFFmpegDecodeStream.SetPosition(Time: real);
begin
AudioDecoderInfo.setPosition(fStream, Time);
end;
function TFFmpegDecodeStream.GetLoop(): boolean;
begin
Result := AudioDecoderInfo.getLoop(fStream);
end;
procedure TFFmpegDecodeStream.SetLoop(Enabled: boolean);
begin
AudioDecoderInfo.setLoop(fStream, Enabled);
end;
function TFFmpegDecodeStream.ReadData(Buffer: PByteArray; BufferSize: integer): integer;
begin
Result := AudioDecoderInfo.readData(fStream, PCUint8(Buffer), BufferSize);
end;
{ TAudioDecoder_FFmpeg }
constructor TAudioDecoder_FFmpeg.Create();
begin
inherited Create();
fPluginInfo := Plugin_register(MediaPluginCore);
end;
function TAudioDecoder_FFmpeg.GetName: String;
begin
Result := 'Plugin:' + fPluginInfo.name;
end;
function TAudioDecoder_FFmpeg.InitializeDecoder: boolean;
begin
fPluginInfo.initialize();
AudioDecoderInfo := fPluginInfo.audioDecoder;
Result := true;
end;
function TAudioDecoder_FFmpeg.FinalizeDecoder(): boolean;
begin
fPluginInfo.finalize();
Result := true;
end;
function TAudioDecoder_FFmpeg.Open(const Filename: IPath): TAudioDecodeStream;
var
Stream: TFFmpegDecodeStream;
begin
Result := nil;
Stream := TFFmpegDecodeStream.Create();
if (not Stream.Open(Filename)) then
begin
Stream.Free;
Exit;
end;
Result := Stream;
end;
initialization
MediaManager.Add(TAudioDecoder_FFmpeg.Create);
end.
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