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authortobigun <tobigun@b956fd51-792f-4845-bead-9b4dfca2ff2c>2009-05-08 15:00:25 +0000
committertobigun <tobigun@b956fd51-792f-4845-bead-9b4dfca2ff2c>2009-05-08 15:00:25 +0000
commitf44a93685ae651a08b51a2688a1c8d4c9ae2d28e (patch)
tree55a0e746490984861807e2a2ab349a1c29b028b9 /cmake/src/media/UAudioPlayback_Bass.pas
parent3dc85900d3b6f2bdd269229683452702c3d37cae (diff)
downloadusdx-f44a93685ae651a08b51a2688a1c8d4c9ae2d28e.tar.gz
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checkin of trunk-copy as base for cmake test
git-svn-id: svn://svn.code.sf.net/p/ultrastardx/svn/branches/experimental@1716 b956fd51-792f-4845-bead-9b4dfca2ff2c
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-rw-r--r--cmake/src/media/UAudioPlayback_Bass.pas756
1 files changed, 756 insertions, 0 deletions
diff --git a/cmake/src/media/UAudioPlayback_Bass.pas b/cmake/src/media/UAudioPlayback_Bass.pas
new file mode 100644
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+++ b/cmake/src/media/UAudioPlayback_Bass.pas
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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 UAudioPlayback_Bass;
+
+interface
+
+{$IFDEF FPC}
+ {$MODE Delphi}
+{$ENDIF}
+
+{$I switches.inc}
+
+implementation
+
+uses
+ Classes,
+ Math,
+ UIni,
+ UMain,
+ UMusic,
+ UAudioPlaybackBase,
+ UAudioCore_Bass,
+ ULog,
+ sdl,
+ bass,
+ SysUtils;
+
+type
+ PHDSP = ^HDSP;
+
+type
+ TBassPlaybackStream = class(TAudioPlaybackStream)
+ private
+ Handle: HSTREAM;
+ NeedsRewind: boolean;
+ PausedSeek: boolean; // true if a seek was performed in pause state
+
+ procedure Reset();
+ function IsEOF(): boolean;
+ protected
+ function GetLatency(): double; override;
+ function GetLoop(): boolean; override;
+ procedure SetLoop(Enabled: boolean); override;
+ function GetLength(): real; override;
+ function GetStatus(): TStreamStatus; override;
+ function GetVolume(): single; override;
+ procedure SetVolume(Volume: single); override;
+ function GetPosition: real; override;
+ procedure SetPosition(Time: real); override;
+ public
+ constructor Create();
+ destructor Destroy(); override;
+
+ function Open(SourceStream: TAudioSourceStream): boolean; override;
+ procedure Close(); override;
+
+ procedure Play(); override;
+ procedure Pause(); override;
+ procedure Stop(); override;
+ procedure FadeIn(Time: real; TargetVolume: single); override;
+
+ procedure AddSoundEffect(Effect: TSoundEffect); override;
+ procedure RemoveSoundEffect(Effect: TSoundEffect); override;
+
+ procedure GetFFTData(var Data: TFFTData); override;
+ function GetPCMData(var Data: TPCMData): Cardinal; override;
+
+ function GetAudioFormatInfo(): TAudioFormatInfo; override;
+
+ function ReadData(Buffer: PByteArray; BufferSize: integer): integer;
+
+ property EOF: boolean READ IsEOF;
+ end;
+
+const
+ MAX_VOICE_DELAY = 0.020; // 20ms
+
+type
+ TBassVoiceStream = class(TAudioVoiceStream)
+ private
+ Handle: HSTREAM;
+ public
+ function Open(ChannelMap: integer; FormatInfo: TAudioFormatInfo): boolean; override;
+ procedure Close(); override;
+
+ procedure WriteData(Buffer: PByteArray; BufferSize: integer); override;
+ function ReadData(Buffer: PByteArray; BufferSize: integer): integer; override;
+ function IsEOF(): boolean; override;
+ function IsError(): boolean; override;
+ end;
+
+type
+ TAudioPlayback_Bass = class(TAudioPlaybackBase)
+ private
+ function EnumDevices(): boolean;
+ protected
+ function GetLatency(): double; override;
+ function CreatePlaybackStream(): TAudioPlaybackStream; override;
+ public
+ function GetName: String; override;
+ function InitializePlayback(): boolean; override;
+ function FinalizePlayback: boolean; override;
+ procedure SetAppVolume(Volume: single); override;
+ function CreateVoiceStream(ChannelMap: integer; FormatInfo: TAudioFormatInfo): TAudioVoiceStream; override;
+ end;
+
+ TBassOutputDevice = class(TAudioOutputDevice)
+ private
+ BassDeviceID: DWORD; // DeviceID used by BASS
+ end;
+
+var
+ BassCore: TAudioCore_Bass;
+
+
+{ TBassPlaybackStream }
+
+function PlaybackStreamHandler(handle: HSTREAM; buffer: Pointer; length: DWORD; user: Pointer): DWORD;
+{$IFDEF MSWINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
+var
+ PlaybackStream: TBassPlaybackStream;
+ BytesRead: integer;
+begin
+ PlaybackStream := TBassPlaybackStream(user);
+ if (not assigned (PlaybackStream)) then
+ begin
+ Result := BASS_STREAMPROC_END;
+ Exit;
+ end;
+
+ BytesRead := PlaybackStream.ReadData(buffer, length);
+ // check for errors
+ if (BytesRead < 0) then
+ Result := BASS_STREAMPROC_END
+ // check for EOF
+ else if (PlaybackStream.EOF) then
+ Result := BytesRead or BASS_STREAMPROC_END
+ // no error/EOF
+ else
+ Result := BytesRead;
+end;
+
+function TBassPlaybackStream.ReadData(Buffer: PByteArray; BufferSize: integer): integer;
+var
+ AdjustedSize: integer;
+ RequestedSourceSize, SourceSize: integer;
+ SkipCount: integer;
+ SourceFormatInfo: TAudioFormatInfo;
+ FrameSize: integer;
+ PadFrame: PByteArray;
+ //Info: BASS_INFO;
+ //Latency: double;
+begin
+ Result := -1;
+
+ if (not assigned(SourceStream)) then
+ Exit;
+
+ // sanity check
+ if (BufferSize = 0) then
+ begin
+ Result := 0;
+ Exit;
+ end;
+
+ SourceFormatInfo := SourceStream.GetAudioFormatInfo();
+ FrameSize := SourceFormatInfo.FrameSize;
+
+ // check how much data to fetch to be in synch
+ AdjustedSize := Synchronize(BufferSize, SourceFormatInfo);
+
+ // skip data if we are too far behind
+ SkipCount := AdjustedSize - BufferSize;
+ while (SkipCount > 0) do
+ begin
+ RequestedSourceSize := Min(SkipCount, BufferSize);
+ SourceSize := SourceStream.ReadData(Buffer, RequestedSourceSize);
+ // if an error or EOF occured stop skipping and handle error/EOF with the next ReadData()
+ if (SourceSize <= 0) then
+ break;
+ Dec(SkipCount, SourceSize);
+ end;
+
+ // get source data (e.g. from a decoder)
+ RequestedSourceSize := Min(AdjustedSize, BufferSize);
+ SourceSize := SourceStream.ReadData(Buffer, RequestedSourceSize);
+ if (SourceSize < 0) then
+ Exit;
+
+ // set preliminary result
+ Result := SourceSize;
+
+ // if we are to far ahead, fill output-buffer with last frame of source data
+ // Note that AdjustedSize is used instead of SourceSize as the SourceSize might
+ // be less than expected because of errors etc.
+ if (AdjustedSize < BufferSize) then
+ begin
+ // use either the last frame for padding or fill with zero
+ if (SourceSize >= FrameSize) then
+ PadFrame := @Buffer[SourceSize-FrameSize]
+ else
+ PadFrame := nil;
+
+ FillBufferWithFrame(@Buffer[SourceSize], BufferSize - SourceSize,
+ PadFrame, FrameSize);
+ Result := BufferSize;
+ end;
+end;
+
+constructor TBassPlaybackStream.Create();
+begin
+ inherited;
+ Reset();
+end;
+
+destructor TBassPlaybackStream.Destroy();
+begin
+ Close();
+ inherited;
+end;
+
+function TBassPlaybackStream.Open(SourceStream: TAudioSourceStream): boolean;
+var
+ FormatInfo: TAudioFormatInfo;
+ FormatFlags: DWORD;
+begin
+ Result := false;
+
+ // close previous stream and reset state
+ Reset();
+
+ // sanity check if stream is valid
+ if not assigned(SourceStream) then
+ Exit;
+
+ Self.SourceStream := SourceStream;
+ FormatInfo := SourceStream.GetAudioFormatInfo();
+ if (not BassCore.ConvertAudioFormatToBASSFlags(FormatInfo.Format, FormatFlags)) then
+ begin
+ Log.LogError('Unhandled sample-format', 'TBassPlaybackStream.Open');
+ Exit;
+ end;
+
+ // create matching playback stream
+ Handle := BASS_StreamCreate(Round(FormatInfo.SampleRate), FormatInfo.Channels, formatFlags,
+ @PlaybackStreamHandler, Self);
+ if (Handle = 0) then
+ begin
+ Log.LogError('BASS_StreamCreate failed: ' + BassCore.ErrorGetString(BASS_ErrorGetCode()),
+ 'TBassPlaybackStream.Open');
+ Exit;
+ end;
+
+ Result := true;
+end;
+
+procedure TBassPlaybackStream.Close();
+begin
+ // stop and free stream
+ if (Handle <> 0) then
+ begin
+ Bass_StreamFree(Handle);
+ Handle := 0;
+ end;
+
+ // Note: PerformOnClose must be called before SourceStream is invalidated
+ PerformOnClose();
+ // unset source-stream
+ SourceStream := nil;
+end;
+
+procedure TBassPlaybackStream.Reset();
+begin
+ Close();
+ NeedsRewind := false;
+ PausedSeek := false;
+end;
+
+procedure TBassPlaybackStream.Play();
+var
+ NeedsFlush: boolean;
+begin
+ if (not assigned(SourceStream)) then
+ Exit;
+
+ NeedsFlush := true;
+
+ if (BASS_ChannelIsActive(Handle) = BASS_ACTIVE_PAUSED) then
+ begin
+ // only paused (and not seeked while paused) streams are not flushed
+ if (not PausedSeek) then
+ NeedsFlush := false;
+ // paused streams do not need a rewind
+ NeedsRewind := false;
+ end;
+
+ // rewind if necessary. Cases that require no rewind are:
+ // - stream was created and never played
+ // - stream was paused and is resumed now
+ // - stream was stopped and set to a new position already
+ if (NeedsRewind) then
+ SourceStream.Position := 0;
+
+ NeedsRewind := true;
+ PausedSeek := false;
+
+ // start playing and flush buffers on rewind
+ BASS_ChannelPlay(Handle, NeedsFlush);
+end;
+
+procedure TBassPlaybackStream.FadeIn(Time: real; TargetVolume: single);
+begin
+ // start stream
+ Play();
+ // start fade-in: slide from fadeStart- to fadeEnd-volume in FadeInTime
+ BASS_ChannelSlideAttribute(Handle, BASS_ATTRIB_VOL, TargetVolume, Trunc(Time * 1000));
+end;
+
+procedure TBassPlaybackStream.Pause();
+begin
+ BASS_ChannelPause(Handle);
+end;
+
+procedure TBassPlaybackStream.Stop();
+begin
+ BASS_ChannelStop(Handle);
+end;
+
+function TBassPlaybackStream.IsEOF(): boolean;
+begin
+ if (assigned(SourceStream)) then
+ Result := SourceStream.EOF
+ else
+ Result := true;
+end;
+
+function TBassPlaybackStream.GetLatency(): double;
+begin
+ // TODO: should we consider output latency for synching (needs BASS_DEVICE_LATENCY)?
+ //if (BASS_GetInfo(Info)) then
+ // Latency := Info.latency / 1000
+ //else
+ // Latency := 0;
+ Result := 0;
+end;
+
+function TBassPlaybackStream.GetVolume(): single;
+var
+ lVolume: single;
+begin
+ if (not BASS_ChannelGetAttribute(Handle, BASS_ATTRIB_VOL, lVolume)) then
+ begin
+ Log.LogError('BASS_ChannelGetAttribute: ' + BassCore.ErrorGetString(),
+ 'TBassPlaybackStream.GetVolume');
+ Result := 0;
+ Exit;
+ end;
+ Result := Round(lVolume);
+end;
+
+procedure TBassPlaybackStream.SetVolume(Volume: single);
+begin
+ // clamp volume
+ if Volume < 0 then
+ Volume := 0;
+ if Volume > 1.0 then
+ Volume := 1.0;
+ // set volume
+ BASS_ChannelSetAttribute(Handle, BASS_ATTRIB_VOL, Volume);
+end;
+
+function TBassPlaybackStream.GetPosition: real;
+var
+ BufferPosByte: QWORD;
+ BufferPosSec: double;
+begin
+ if assigned(SourceStream) then
+ begin
+ BufferPosByte := BASS_ChannelGetData(Handle, nil, BASS_DATA_AVAILABLE);
+ BufferPosSec := BASS_ChannelBytes2Seconds(Handle, BufferPosByte);
+ // decrease the decoding position by the amount buffered (and hence not played)
+ // in the BASS playback stream.
+ Result := SourceStream.Position - BufferPosSec;
+ end
+ else
+ begin
+ Result := -1;
+ end;
+end;
+
+procedure TBassPlaybackStream.SetPosition(Time: real);
+var
+ ChannelState: DWORD;
+begin
+ if assigned(SourceStream) then
+ begin
+ ChannelState := BASS_ChannelIsActive(Handle);
+ if (ChannelState = BASS_ACTIVE_STOPPED) then
+ begin
+ // if the stream is stopped, do not rewind when the stream is played next time
+ NeedsRewind := false
+ end
+ else if (ChannelState = BASS_ACTIVE_PAUSED) then
+ begin
+ // buffers must be flushed if in paused state but there is no
+ // BASS_ChannelFlush() function so we have to use BASS_ChannelPlay() called in Play().
+ PausedSeek := true;
+ end;
+
+ // set new position
+ SourceStream.Position := Time;
+ end;
+end;
+
+function TBassPlaybackStream.GetLength(): real;
+begin
+ if assigned(SourceStream) then
+ Result := SourceStream.Length
+ else
+ Result := -1;
+end;
+
+function TBassPlaybackStream.GetStatus(): TStreamStatus;
+var
+ State: DWORD;
+begin
+ State := BASS_ChannelIsActive(Handle);
+ case State of
+ BASS_ACTIVE_PLAYING,
+ BASS_ACTIVE_STALLED:
+ Result := ssPlaying;
+ BASS_ACTIVE_PAUSED:
+ Result := ssPaused;
+ BASS_ACTIVE_STOPPED:
+ Result := ssStopped;
+ else
+ begin
+ Log.LogError('Unknown status', 'TBassPlaybackStream.GetStatus');
+ Result := ssStopped;
+ end;
+ end;
+end;
+
+function TBassPlaybackStream.GetLoop(): boolean;
+begin
+ if assigned(SourceStream) then
+ Result := SourceStream.Loop
+ else
+ Result := false;
+end;
+
+procedure TBassPlaybackStream.SetLoop(Enabled: boolean);
+begin
+ if assigned(SourceStream) then
+ SourceStream.Loop := Enabled;
+end;
+
+procedure DSPProcHandler(handle: HDSP; channel: DWORD; buffer: Pointer; length: DWORD; user: Pointer);
+{$IFDEF MSWINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
+var
+ Effect: TSoundEffect;
+begin
+ Effect := TSoundEffect(user);
+ if assigned(Effect) then
+ Effect.Callback(buffer, length);
+end;
+
+procedure TBassPlaybackStream.AddSoundEffect(Effect: TSoundEffect);
+var
+ DspHandle: HDSP;
+begin
+ if assigned(Effect.engineData) then
+ begin
+ Log.LogError('TSoundEffect.engineData already set', 'TBassPlaybackStream.AddSoundEffect');
+ Exit;
+ end;
+
+ DspHandle := BASS_ChannelSetDSP(Handle, @DSPProcHandler, Effect, 0);
+ if (DspHandle = 0) then
+ begin
+ Log.LogError(BassCore.ErrorGetString(), 'TBassPlaybackStream.AddSoundEffect');
+ Exit;
+ end;
+
+ GetMem(Effect.EngineData, SizeOf(HDSP));
+ PHDSP(Effect.EngineData)^ := DspHandle;
+end;
+
+procedure TBassPlaybackStream.RemoveSoundEffect(Effect: TSoundEffect);
+begin
+ if not assigned(Effect.EngineData) then
+ begin
+ Log.LogError('TSoundEffect.engineData invalid', 'TBassPlaybackStream.RemoveSoundEffect');
+ Exit;
+ end;
+
+ if not BASS_ChannelRemoveDSP(Handle, PHDSP(Effect.EngineData)^) then
+ begin
+ Log.LogError(BassCore.ErrorGetString(), 'TBassPlaybackStream.RemoveSoundEffect');
+ Exit;
+ end;
+
+ FreeMem(Effect.EngineData);
+ Effect.EngineData := nil;
+end;
+
+procedure TBassPlaybackStream.GetFFTData(var Data: TFFTData);
+begin
+ // get FFT channel data (Mono, FFT512 -> 256 values)
+ BASS_ChannelGetData(Handle, @Data, BASS_DATA_FFT512);
+end;
+
+{*
+ * Copies interleaved PCM SInt16 stereo samples into data.
+ * Returns the number of frames
+ *}
+function TBassPlaybackStream.GetPCMData(var Data: TPCMData): Cardinal;
+var
+ Info: BASS_CHANNELINFO;
+ nBytes: DWORD;
+begin
+ Result := 0;
+
+ FillChar(Data, SizeOf(TPCMData), 0);
+
+ // no support for non-stereo files at the moment
+ BASS_ChannelGetInfo(Handle, Info);
+ if (Info.chans <> 2) then
+ Exit;
+
+ nBytes := BASS_ChannelGetData(Handle, @Data, SizeOf(TPCMData));
+ if(nBytes <= 0) then
+ Result := 0
+ else
+ Result := nBytes div SizeOf(TPCMStereoSample);
+end;
+
+function TBassPlaybackStream.GetAudioFormatInfo(): TAudioFormatInfo;
+begin
+ if assigned(SourceStream) then
+ Result := SourceStream.GetAudioFormatInfo()
+ else
+ Result := nil;
+end;
+
+
+{ TBassVoiceStream }
+
+function TBassVoiceStream.Open(ChannelMap: integer; FormatInfo: TAudioFormatInfo): boolean;
+var
+ Flags: DWORD;
+begin
+ Result := false;
+
+ Close();
+
+ if (not inherited Open(ChannelMap, FormatInfo)) then
+ Exit;
+
+ // get channel flags
+ BassCore.ConvertAudioFormatToBASSFlags(FormatInfo.Format, Flags);
+
+ (*
+ // distribute the mics equally to both speakers
+ if ((ChannelMap and CHANNELMAP_LEFT) <> 0) then
+ Flags := Flags or BASS_SPEAKER_FRONTLEFT;
+ if ((ChannelMap and CHANNELMAP_RIGHT) <> 0) then
+ Flags := Flags or BASS_SPEAKER_FRONTRIGHT;
+ *)
+
+ // create the channel
+ Handle := BASS_StreamCreate(Round(FormatInfo.SampleRate), 1, Flags, STREAMPROC_PUSH, nil);
+
+ // start the channel
+ BASS_ChannelPlay(Handle, true);
+
+ Result := true;
+end;
+
+procedure TBassVoiceStream.Close();
+begin
+ if (Handle <> 0) then
+ begin
+ BASS_ChannelStop(Handle);
+ BASS_StreamFree(Handle);
+ end;
+ inherited Close();
+end;
+
+procedure TBassVoiceStream.WriteData(Buffer: PByteArray; BufferSize: integer);
+var QueueSize: DWORD;
+begin
+ if ((Handle <> 0) and (BufferSize > 0)) then
+ begin
+ // query the queue size (normally 0)
+ QueueSize := BASS_StreamPutData(Handle, nil, 0);
+ // flush the buffer if the delay would be too high
+ if (QueueSize > MAX_VOICE_DELAY * FormatInfo.BytesPerSec) then
+ BASS_ChannelPlay(Handle, true);
+ // send new data to playback buffer
+ BASS_StreamPutData(Handle, Buffer, BufferSize);
+ end;
+end;
+
+// Note: we do not need the read-function for the BASS implementation
+function TBassVoiceStream.ReadData(Buffer: PByteArray; BufferSize: integer): integer;
+begin
+ Result := -1;
+end;
+
+function TBassVoiceStream.IsEOF(): boolean;
+begin
+ Result := false;
+end;
+
+function TBassVoiceStream.IsError(): boolean;
+begin
+ Result := false;
+end;
+
+
+{ TAudioPlayback_Bass }
+
+function TAudioPlayback_Bass.GetName: String;
+begin
+ Result := 'BASS_Playback';
+end;
+
+function TAudioPlayback_Bass.EnumDevices(): boolean;
+var
+ BassDeviceID: DWORD;
+ DeviceIndex: integer;
+ Device: TBassOutputDevice;
+ DeviceInfo: BASS_DEVICEINFO;
+begin
+ Result := true;
+
+ ClearOutputDeviceList();
+
+ // skip "no sound"-device (ID = 0)
+ BassDeviceID := 1;
+
+ while (true) do
+ begin
+ // check for device
+ if (not BASS_GetDeviceInfo(BassDeviceID, DeviceInfo)) then
+ Break;
+
+ // set device info
+ Device := TBassOutputDevice.Create();
+ Device.Name := DeviceInfo.name;
+ Device.BassDeviceID := BassDeviceID;
+
+ // add device to list
+ SetLength(OutputDeviceList, BassDeviceID);
+ OutputDeviceList[BassDeviceID-1] := Device;
+
+ Inc(BassDeviceID);
+ end;
+end;
+
+function TAudioPlayback_Bass.InitializePlayback(): boolean;
+begin
+ result := false;
+
+ BassCore := TAudioCore_Bass.GetInstance();
+
+ EnumDevices();
+
+ //Log.BenchmarkStart(4);
+ //Log.LogStatus('Initializing Playback Subsystem', 'Music Initialize');
+
+ // TODO: use BASS_DEVICE_LATENCY to determine the latency
+ if not BASS_Init(-1, 44100, 0, 0, nil) then
+ begin
+ Log.LogError('Could not initialize BASS', 'TAudioPlayback_Bass.InitializePlayback');
+ Exit;
+ end;
+
+ //Log.BenchmarkEnd(4); Log.LogBenchmark('--> Bass Init', 4);
+
+ // config playing buffer
+ //BASS_SetConfig(BASS_CONFIG_UPDATEPERIOD, 10);
+ //BASS_SetConfig(BASS_CONFIG_BUFFER, 100);
+
+ result := true;
+end;
+
+function TAudioPlayback_Bass.FinalizePlayback(): boolean;
+begin
+ Close;
+ BASS_Free;
+ inherited FinalizePlayback();
+ Result := true;
+end;
+
+function TAudioPlayback_Bass.CreatePlaybackStream(): TAudioPlaybackStream;
+begin
+ Result := TBassPlaybackStream.Create();
+end;
+
+procedure TAudioPlayback_Bass.SetAppVolume(Volume: single);
+begin
+ // set volume for this application (ranges from 0..10000 since BASS 2.4)
+ BASS_SetConfig(BASS_CONFIG_GVOL_STREAM, Round(Volume*10000));
+end;
+
+function TAudioPlayback_Bass.CreateVoiceStream(ChannelMap: integer; FormatInfo: TAudioFormatInfo): TAudioVoiceStream;
+var
+ VoiceStream: TAudioVoiceStream;
+begin
+ Result := nil;
+
+ VoiceStream := TBassVoiceStream.Create();
+ if (not VoiceStream.Open(ChannelMap, FormatInfo)) then
+ begin
+ VoiceStream.Free;
+ Exit;
+ end;
+
+ Result := VoiceStream;
+end;
+
+function TAudioPlayback_Bass.GetLatency(): double;
+begin
+ Result := 0;
+end;
+
+
+initialization
+ MediaManager.Add(TAudioPlayback_Bass.Create);
+
+end.