diff options
Diffstat (limited to '')
| -rw-r--r-- | Game/Code/Classes/UAudioPlayback_SoftMixer.pas | 1793 |
1 files changed, 899 insertions, 894 deletions
diff --git a/Game/Code/Classes/UAudioPlayback_SoftMixer.pas b/Game/Code/Classes/UAudioPlayback_SoftMixer.pas index 29983778..75fddf95 100644 --- a/Game/Code/Classes/UAudioPlayback_SoftMixer.pas +++ b/Game/Code/Classes/UAudioPlayback_SoftMixer.pas @@ -1,894 +1,899 @@ -unit UAudioPlayback_SoftMixer;
-
-interface
-
-{$IFDEF FPC}
- {$MODE Delphi}
-{$ENDIF}
-
-{$I switches.inc}
-
-
-uses
- Classes,
- SysUtils,
- sdl,
- UMusic;
-
-type
- TAudioPlayback_SoftMixer = class;
-
- TSoftMixerPlaybackStream = class(TAudioPlaybackStream)
- private
- Engine: TAudioPlayback_SoftMixer;
-
- DecodeStream: TAudioDecodeStream;
- SampleBuffer : PChar;
- SampleBufferCount: integer; // number of available bytes in SampleBuffer
- SampleBufferPos : cardinal;
- BytesAvail: integer;
- cvt: TSDL_AudioCVT;
-
- Status: TStreamStatus;
- Loop: boolean;
- _volume: integer;
-
- InternalLock: PSDL_Mutex;
-
- procedure Reset();
-
- class function ConvertAudioFormatToSDL(fmt: TAudioSampleFormat): UInt16;
- function InitFormatConversion(): boolean;
-
- procedure Lock(); {$IFDEF HasInline}inline;{$ENDIF}
- procedure Unlock(); {$IFDEF HasInline}inline;{$ENDIF}
- public
- constructor Create(Engine: TAudioPlayback_SoftMixer);
- destructor Destroy(); override;
-
- function SetDecodeStream(decodeStream: TAudioDecodeStream): boolean;
-
- procedure Play(); override;
- procedure Pause(); override;
- procedure Stop(); override;
- procedure Close(); override;
- function GetLoop(): boolean; override;
- procedure SetLoop(Enabled: boolean); override;
- function GetLength(): real; override;
- function GetStatus(): TStreamStatus; override;
-
- function IsLoaded(): boolean;
-
- function GetVolume(): integer; override;
- procedure SetVolume(Volume: integer); override;
-
- // functions delegated to the decode stream
- function GetPosition: real;
- procedure SetPosition(Time: real);
- function ReadData(Buffer: PChar; BufSize: integer): integer;
-
- function GetPCMData(var data: TPCMData): Cardinal;
- procedure GetFFTData(var data: TFFTData);
- end;
-
- TAudioMixerStream = class
- private
- activeStreams: TList;
- mixerBuffer: PChar;
- internalLock: PSDL_Mutex;
-
- _volume: integer;
-
- procedure Lock(); {$IFDEF HasInline}inline;{$ENDIF}
- procedure Unlock(); {$IFDEF HasInline}inline;{$ENDIF}
-
- function GetVolume(): integer;
- procedure SetVolume(volume: integer);
- public
- constructor Create();
- destructor Destroy(); override;
- procedure AddStream(stream: TAudioPlaybackStream);
- procedure RemoveStream(stream: TAudioPlaybackStream);
- function ReadData(Buffer: PChar; BufSize: integer): integer;
-
- property Volume: integer READ GetVolume WRITE SetVolume;
- end;
-
- TAudioPlayback_SoftMixer = class( TInterfacedObject, IAudioPlayback )
- private
- MusicStream: TSoftMixerPlaybackStream;
- MixerStream: TAudioMixerStream;
- protected
- FormatInfo: TAudioFormatInfo;
-
- function InitializeAudioPlaybackEngine(): boolean; virtual; abstract;
- function StartAudioPlaybackEngine(): boolean; virtual; abstract;
- procedure StopAudioPlaybackEngine(); virtual; abstract;
- procedure AudioCallback(buffer: PChar; size: integer); {$IFDEF HasInline}inline;{$ENDIF}
- public
- function GetName: String; virtual; abstract;
-
- function InitializePlayback(): boolean;
- destructor Destroy; override;
-
- function Load(const Filename: String): TSoftMixerPlaybackStream;
-
- procedure SetVolume(Volume: integer);
- procedure SetMusicVolume(Volume: integer);
- procedure SetLoop(Enabled: boolean);
- function Open(const Filename: string): boolean; // true if succeed
- procedure Rewind;
- procedure SetPosition(Time: real);
- procedure Play;
- procedure Pause;
-
- procedure Stop;
- procedure Close;
- function Finished: boolean;
- function Length: real;
- function GetPosition: real;
-
- // Equalizer
- procedure GetFFTData(var data: TFFTData);
-
- // Interface for Visualizer
- function GetPCMData(var data: TPCMData): Cardinal;
-
- function GetMixer(): TAudioMixerStream; {$IFDEF HasInline}inline;{$ENDIF}
- function GetAudioFormatInfo(): TAudioFormatInfo;
-
- // Sounds
- function OpenSound(const Filename: String): TAudioPlaybackStream;
- procedure PlaySound(stream: TAudioPlaybackStream);
- procedure StopSound(stream: TAudioPlaybackStream);
- end;
-
-implementation
-
-uses
- Math,
- //samplerate,
- UFFT,
- ULog,
- UIni,
- UMain;
-
-{ TAudioMixerStream }
-
-constructor TAudioMixerStream.Create();
-begin
- activeStreams := TList.Create;
- internalLock := SDL_CreateMutex();
- _volume := 100;
-end;
-
-destructor TAudioMixerStream.Destroy();
-begin
- if assigned(mixerBuffer) then
- Freemem(mixerBuffer);
- activeStreams.Free;
- SDL_DestroyMutex(internalLock);
-end;
-
-procedure TAudioMixerStream.Lock();
-begin
- SDL_mutexP(internalLock);
-end;
-
-procedure TAudioMixerStream.Unlock();
-begin
- SDL_mutexV(internalLock);
-end;
-
-function TAudioMixerStream.GetVolume(): integer;
-begin
- Lock();
- result := _volume;
- Unlock();
-end;
-
-procedure TAudioMixerStream.SetVolume(volume: integer);
-begin
- Lock();
- _volume := volume;
- Unlock();
-end;
-
-procedure TAudioMixerStream.AddStream(stream: TAudioPlaybackStream);
-begin
- if not assigned(stream) then
- Exit;
-
- Lock();
- // check if stream is already in list to avoid duplicates
- if (activeStreams.IndexOf(Pointer(stream)) = -1) then
- activeStreams.Add(Pointer(stream));
- Unlock();
-end;
-
-(*
- * Sets the entry of stream in the activeStreams-List to nil
- * but does not remove it from the list (count is not changed!).
- * Otherwise iterations over the elements might fail due to a
- * changed count-property.
- * Call activeStreams.Pack() to remove the nil-pointers
- * or check for nil-pointers when accessing activeStreams.
- *)
-procedure TAudioMixerStream.RemoveStream(stream: TAudioPlaybackStream);
-var
- index: integer;
-begin
- Lock();
- index := activeStreams.IndexOf(Pointer(stream));
- if (index <> -1) then
- begin
- // remove entry but do not decrease count-property
- activeStreams[index] := nil;
- end;
- Unlock();
-end;
-
-function TAudioMixerStream.ReadData(Buffer: PChar; BufSize: integer): integer;
-var
- i: integer;
- size: integer;
- stream: TSoftMixerPlaybackStream;
- appVolume: single;
- needsPacking: boolean;
-begin
- result := BufSize;
-
- // zero target-buffer (silence)
- FillChar(Buffer^, BufSize, 0);
-
- // resize mixer-buffer if necessary
- ReallocMem(mixerBuffer, BufSize);
- if not assigned(mixerBuffer) then
- Exit;
-
- Lock();
-
- // calc application volume
- // use _volume instead of Volume to prevent recursive locking
- appVolume := _volume / 100 * SDL_MIX_MAXVOLUME;
-
- needsPacking := false;
-
- // mix streams to one stream
- for i := 0 to activeStreams.Count-1 do
- begin
- if (activeStreams[i] = nil) then
- begin
- needsPacking := true;
- continue;
- end;
-
- stream := TSoftMixerPlaybackStream(activeStreams[i]);
- // fetch data from current stream
- size := stream.ReadData(mixerBuffer, BufSize);
- if (size > 0) then
- begin
- SDL_MixAudio(PUInt8(Buffer), PUInt8(mixerBuffer), size,
- Trunc(appVolume * stream.Volume / 100));
- end;
- end;
-
- // remove nil-pointers from list
- if (needsPacking) then
- begin
- activeStreams.Pack();
- end;
-
- Unlock();
-end;
-
-
-{ TSoftMixerPlaybackStream }
-
-constructor TSoftMixerPlaybackStream.Create(Engine: TAudioPlayback_SoftMixer);
-begin
- inherited Create();
- Self.Engine := Engine;
- internalLock := SDL_CreateMutex();
- Reset();
-end;
-
-destructor TSoftMixerPlaybackStream.Destroy();
-begin
- Close();
- SDL_DestroyMutex(internalLock);
- inherited Destroy();
-end;
-
-procedure TSoftMixerPlaybackStream.Reset();
-begin
- Stop();
- Loop := false;
- // TODO: use DecodeStream.Unref() instead of Free();
- FreeAndNil(DecodeStream);
- FreeMem(SampleBuffer);
- SampleBuffer := nil;
- SampleBufferPos := 0;
- BytesAvail := 0;
- _volume := 0;
-end;
-
-procedure TSoftMixerPlaybackStream.Lock();
-begin
- SDL_mutexP(internalLock);
-end;
-
-procedure TSoftMixerPlaybackStream.Unlock();
-begin
- SDL_mutexV(internalLock);
-end;
-
-class function TSoftMixerPlaybackStream.ConvertAudioFormatToSDL(fmt: TAudioSampleFormat): UInt16;
-begin
- case fmt of
- asfU8: Result := AUDIO_U8;
- asfS8: Result := AUDIO_S8;
- asfU16LSB: Result := AUDIO_U16LSB;
- asfS16LSB: Result := AUDIO_S16LSB;
- asfU16MSB: Result := AUDIO_U16MSB;
- asfS16MSB: Result := AUDIO_S16MSB;
- asfU16: Result := AUDIO_U16;
- asfS16: Result := AUDIO_S16;
- else Result := 0;
- end;
-end;
-
-function TSoftMixerPlaybackStream.InitFormatConversion(): boolean;
-var
- err: integer;
- srcFormat: UInt16;
- dstFormat: UInt16;
- srcFormatInfo: TAudioFormatInfo;
- dstFormatInfo: TAudioFormatInfo;
-begin
- Result := false;
-
- srcFormatInfo := DecodeStream.GetAudioFormatInfo();
- dstFormatInfo := Engine.GetAudioFormatInfo();
-
- srcFormat := ConvertAudioFormatToSDL(srcFormatInfo.Format);
- dstFormat := ConvertAudioFormatToSDL(dstFormatInfo.Format);
-
- if ((srcFormat = 0) or (dstFormat = 0)) then
- begin
- Log.LogError('Audio-format not supported by SDL', 'TSoftMixerPlaybackStream.InitFormatConversion');
- Exit;
- end;
-
- if (SDL_BuildAudioCVT(@cvt,
- srcFormat, srcFormatInfo.Channels, srcFormatInfo.SampleRate,
- dstFormat, dstFormatInfo.Channels, dstFormatInfo.SampleRate) = -1) then
- begin
- Log.LogError(SDL_GetError(), 'TSoftMixerPlaybackStream.InitFormatConversion');
- Exit;
- end;
-
- Result := true;
-end;
-
-function TSoftMixerPlaybackStream.SetDecodeStream(decodeStream: TAudioDecodeStream): boolean;
-begin
- result := false;
-
- Reset();
-
- if not assigned(decodeStream) then
- Exit;
- Self.DecodeStream := decodeStream;
- if not InitFormatConversion() then
- Exit;
-
- _volume := 100;
-
- result := true;
-end;
-
-procedure TSoftMixerPlaybackStream.Close();
-begin
- Reset();
-end;
-
-procedure TSoftMixerPlaybackStream.Play();
-var
- mixer: TAudioMixerStream;
-begin
- if (status <> ssPaused) then
- begin
- // rewind
- if assigned(DecodeStream) then
- DecodeStream.Position := 0;
- end;
- status := ssPlaying;
-
- mixer := Engine.GetMixer();
- if (mixer <> nil) then
- mixer.AddStream(Self);
-end;
-
-procedure TSoftMixerPlaybackStream.Pause();
-var
- mixer: TAudioMixerStream;
-begin
- status := ssPaused;
-
- mixer := Engine.GetMixer();
- if (mixer <> nil) then
- mixer.RemoveStream(Self);
-end;
-
-procedure TSoftMixerPlaybackStream.Stop();
-var
- mixer: TAudioMixerStream;
-begin
- status := ssStopped;
-
- mixer := Engine.GetMixer();
- if (mixer <> nil) then
- mixer.RemoveStream(Self);
-end;
-
-function TSoftMixerPlaybackStream.IsLoaded(): boolean;
-begin
- result := assigned(DecodeStream);
-end;
-
-function TSoftMixerPlaybackStream.GetLoop(): boolean;
-begin
- result := Loop;
-end;
-
-procedure TSoftMixerPlaybackStream.SetLoop(Enabled: boolean);
-begin
- Loop := Enabled;
-end;
-
-function TSoftMixerPlaybackStream.GetLength(): real;
-begin
- if assigned(DecodeStream) then
- result := DecodeStream.Length
- else
- result := -1;
-end;
-
-function TSoftMixerPlaybackStream.GetStatus(): TStreamStatus;
-begin
- result := status;
-end;
-
-{*
- * Note: 44.1kHz to 48kHz conversion or vice versa is not supported
- * by SDL at the moment. No conversion takes place in this cases.
- * This is because SDL just converts differences in powers of 2.
- * So the result might not be that accurate. Although this is not
- * audible in most cases it needs synchronization with the video
- * or the lyrics timer.
- * Using libsamplerate might give better results.
- *}
-function TSoftMixerPlaybackStream.ReadData(Buffer: PChar; BufSize: integer): integer;
-var
- decodeBufSize: integer;
- sampleBufSize: integer;
- nBytesDecoded: integer;
- frameSize: integer;
- remFrameBytes: integer;
- copyCnt: integer;
- BytesNeeded: integer;
-begin
- Result := -1;
-
- BytesNeeded := BufSize;
-
- // copy remaining data from the last call to the result-buffer
- if (BytesAvail > 0) then
- begin
- copyCnt := Min(BufSize, BytesAvail);
- Move(SampleBuffer[SampleBufferPos], Buffer[0], copyCnt);
- Dec(BytesAvail, copyCnt);
- Dec(BytesNeeded, copyCnt);
- if (BytesNeeded = 0) then
- begin
- // Result-Buffer is full -> no need to decode more data.
- // The sample-buffer might even contain some data for the next call
- Inc(SampleBufferPos, copyCnt);
- Result := BufSize;
- Exit;
- end;
- end;
-
- if not assigned(DecodeStream) then
- Exit;
-
- // calc number of bytes to decode
- decodeBufSize := Ceil(BufSize / cvt.len_ratio);
- // assure that the decode-size is a multiple of the frame size
- frameSize := DecodeStream.GetAudioFormatInfo().FrameSize;
- remFrameBytes := decodeBufSize mod frameSize;
- if (remFrameBytes > 0) then
- decodeBufSize := decodeBufSize + (frameSize - remFrameBytes);
-
- Lock();
- try
- // calc buffer size
- sampleBufSize := decodeBufSize * cvt.len_mult;
-
- // resize buffer if necessary.
- // The required buffer-size will be smaller than the result-buffer
- // in most cases (if the decoded signal is mono or has a lesser bitrate).
- // If the output-rate is 44.1kHz and the decode-rate is 48kHz or 96kHz it
- // will be ~1.09 or ~2.18 times bigger. Those extra memory consumption
- // should be reasonable. If not we should call TDecodeStream.ReadData()
- // multiple times.
- // Note: we do not decrease the buffer by the count of bytes used from
- // the previous call of this function (bytesAvail). Otherwise the
- // buffer will be reallocated each time this function is called just to
- // add or remove a few bytes from the buffer.
- // By not doing this the buffer's size should be rather stable and it
- // will not be reallocated/resized at all if the BufSize params does not
- // change in consecutive calls.
- ReallocMem(SampleBuffer, sampleBufSize);
- if not assigned(SampleBuffer) then
- Exit;
-
- // decode data
- nBytesDecoded := DecodeStream.ReadData(SampleBuffer, decodeBufSize);
- if (nBytesDecoded = -1) then
- Exit;
-
- // end-of-file reached -> stop playback
- if (DecodeStream.EOF) then
- Stop();
-
- // resample decoded data
- cvt.buf := PUint8(SampleBuffer);
- cvt.len := nBytesDecoded;
- if (SDL_ConvertAudio(@cvt) = -1) then
- Exit;
-
- SampleBufferCount := cvt.len_cvt;
- finally
- Unlock();
- end;
-
- BytesAvail := SampleBufferCount;
- SampleBufferPos := 0;
-
- // copy data to result buffer
- copyCnt := Min(BytesNeeded, BytesAvail);
- Move(SampleBuffer[0], Buffer[BufSize - BytesNeeded], copyCnt);
- Dec(BytesAvail, copyCnt);
- Dec(BytesNeeded, copyCnt);
- Inc(SampleBufferPos, copyCnt);
-
- Result := BufSize - BytesNeeded;
-end;
-
-(* TODO: libsamplerate support
-function TSoftMixerPlaybackStream.ReadData(Buffer: PChar; BufSize: integer): integer;
-var
- convState: PSRC_STATE;
- convData: SRC_DATA;
- error: integer;
-begin
- // Note: needs mono->stereo conversion, multi-channel->stereo, etc.
- // maybe we should use SDL for the channel-conversion stuff
- // and use libsamplerate afterwards for the frequency-conversion
-
- //convState := src_new(SRC_SINC_MEDIUM_QUALITY, 2, @error);
- //src_short_to_float_array(input, output, len);
- convData.
- if (src_process(convState, @convData) <> 0) then
- begin
- Log.LogError(src_strerror(src_error(convState)), 'TSoftMixerPlaybackStream.ReadData');
- Exit;
- end;
- src_float_to_short_array();
- //src_delete(convState);
-end;
-*)
-
-function TSoftMixerPlaybackStream.GetPCMData(var data: TPCMData): Cardinal;
-var size: integer;
-begin
- Result := 0;
-(*
- // just SInt16 stereo support for now
- if ((Engine.GetAudioFormatInfo().Format <> asfS16) or
- (Engine.GetAudioFormatInfo().Channels <> 2)) then
- begin
- Exit;
- end;
-
- // zero memory
- FillChar(data, SizeOf(data), 0);
-
- Lock();
- Result := Min(SizeOf(data), SampleBufferCount);
- if (Result > 0) then
- begin
- Move(SampleBuffer[0], data[0], Result);
- end;
- Unlock();
-*)
-end;
-
-procedure TSoftMixerPlaybackStream.GetFFTData(var data: TFFTData);
-var
- i: integer;
- Frames: integer;
- DataIn: PSingleArray;
- AudioFormat: TAudioFormatInfo;
-begin
- // only works with SInt16 and Float values at the moment
- AudioFormat := Engine.GetAudioFormatInfo();
-
- DataIn := AllocMem(FFTSize * SizeOf(Single));
- if (DataIn = nil) then
- Exit;
-
- Lock();
- // TODO: We just use the first Frames frames, the others are ignored.
- // This is OK for the equalizer display but not if we want to use
- // this function for voice-analysis someday (I don't think we want).
- Frames := Min(FFTSize, SampleBufferCount div AudioFormat.FrameSize);
- // use only first channel and convert data to float-values
- case AudioFormat.Format of
- asfS16:
- begin
- for i := 0 to Frames-1 do
- DataIn[i] := PSmallInt(@SampleBuffer[i*AudioFormat.FrameSize])^ / -Low(SmallInt);
- end;
- asfFloat:
- begin
- for i := 0 to Frames-1 do
- DataIn[i] := PSingle(@SampleBuffer[i*AudioFormat.FrameSize])^;
- end;
- end;
- Unlock();
-
- WindowFunc(fwfHanning, FFTSize, DataIn);
- PowerSpectrum(FFTSize, DataIn, @data);
- FreeMem(DataIn);
-
- // resize data to a 0..1 range
- for i := 0 to High(TFFTData) do
- begin
- // TODO: this might need some work
- data[i] := Sqrt(data[i]) / 100;
- end;
-end;
-
-function TSoftMixerPlaybackStream.GetPosition: real;
-begin
- if assigned(DecodeStream) then
- result := DecodeStream.Position
- else
- result := -1;
-end;
-
-procedure TSoftMixerPlaybackStream.SetPosition(Time: real);
-begin
- if assigned(DecodeStream) then
- DecodeStream.Position := Time;
-end;
-
-function TSoftMixerPlaybackStream.GetVolume(): integer;
-begin
- result := _volume;
-end;
-
-procedure TSoftMixerPlaybackStream.SetVolume(volume: integer);
-begin
- // clamp volume
- if (volume > 100) then
- _volume := 100
- else if (volume < 0) then
- _volume := 0
- else
- _volume := volume;
-end;
-
-
-{ TAudioPlayback_SoftMixer }
-
-function TAudioPlayback_SoftMixer.InitializePlayback: boolean;
-begin
- result := false;
-
- //Log.LogStatus('InitializePlayback', 'UAudioPlayback_SoftMixer');
-
- if(not InitializeAudioPlaybackEngine()) then
- Exit;
-
- MixerStream := TAudioMixerStream.Create;
-
- if(not StartAudioPlaybackEngine()) then
- Exit;
-
- result := true;
-end;
-
-destructor TAudioPlayback_SoftMixer.Destroy;
-begin
- StopAudioPlaybackEngine();
-
- FreeAndNil(MusicStream);
- FreeAndNil(MixerStream);
- FreeAndNil(FormatInfo);
-
- inherited Destroy();
-end;
-
-procedure TAudioPlayback_SoftMixer.AudioCallback(buffer: PChar; size: integer);
-begin
- MixerStream.ReadData(buffer, size);
-end;
-
-function TAudioPlayback_SoftMixer.GetMixer(): TAudioMixerStream;
-begin
- Result := MixerStream;
-end;
-
-function TAudioPlayback_SoftMixer.GetAudioFormatInfo(): TAudioFormatInfo;
-begin
- Result := FormatInfo;
-end;
-
-function TAudioPlayback_SoftMixer.Load(const Filename: String): TSoftMixerPlaybackStream;
-var
- decodeStream: TAudioDecodeStream;
- playbackStream: TSoftMixerPlaybackStream;
-begin
- Result := nil;
-
- decodeStream := AudioDecoder.Open(Filename);
- if not assigned(decodeStream) then
- begin
- Log.LogStatus('LoadSoundFromFile: Sound not found "' + Filename + '"', 'UAudioPlayback_SoftMixer');
- Exit;
- end;
-
- playbackStream := TSoftMixerPlaybackStream.Create(Self);
- if (not playbackStream.SetDecodeStream(decodeStream)) then
- Exit;
-
- result := playbackStream;
-end;
-
-procedure TAudioPlayback_SoftMixer.SetVolume(Volume: integer);
-begin
- // sets volume only for this application
- MixerStream.Volume := Volume;
-end;
-
-procedure TAudioPlayback_SoftMixer.SetMusicVolume(Volume: Integer);
-begin
- if assigned(MusicStream) then
- MusicStream.Volume := Volume;
-end;
-
-procedure TAudioPlayback_SoftMixer.SetLoop(Enabled: boolean);
-begin
- if assigned(MusicStream) then
- MusicStream.SetLoop(Enabled);
-end;
-
-function TAudioPlayback_SoftMixer.Open(const Filename: string): boolean;
-var
- decodeStream: TAudioDecodeStream;
-begin
- Result := false;
-
- // free old MusicStream
- MusicStream.Free();
- // and load new one
- MusicStream := Load(Filename);
- if not assigned(MusicStream) then
- Exit;
-
- //Set Max Volume
- SetMusicVolume(100);
-
- Result := true;
-end;
-
-procedure TAudioPlayback_SoftMixer.Rewind;
-begin
- SetPosition(0);
-end;
-
-procedure TAudioPlayback_SoftMixer.SetPosition(Time: real);
-begin
- if assigned(MusicStream) then
- MusicStream.SetPosition(Time);
-end;
-
-function TAudioPlayback_SoftMixer.GetPosition: real;
-begin
- if assigned(MusicStream) then
- Result := MusicStream.GetPosition()
- else
- Result := -1;
-end;
-
-function TAudioPlayback_SoftMixer.Length: real;
-begin
- if assigned(MusicStream) then
- Result := MusicStream.GetLength()
- else
- Result := -1;
-end;
-
-procedure TAudioPlayback_SoftMixer.Play;
-begin
- if assigned(MusicStream) then
- MusicStream.Play();
-end;
-
-procedure TAudioPlayback_SoftMixer.Pause;
-begin
- if assigned(MusicStream) then
- MusicStream.Pause();
-end;
-
-procedure TAudioPlayback_SoftMixer.Stop;
-begin
- if assigned(MusicStream) then
- MusicStream.Stop();
-end;
-
-procedure TAudioPlayback_SoftMixer.Close;
-begin
- if assigned(MusicStream) then
- begin
- MusicStream.Close();
- end;
-end;
-
-function TAudioPlayback_SoftMixer.Finished: boolean;
-begin
- if assigned(MusicStream) then
- Result := (MusicStream.GetStatus() = ssStopped)
- else
- Result := true;
-end;
-
-//Equalizer
-procedure TAudioPlayback_SoftMixer.GetFFTData(var data: TFFTData);
-begin
- if assigned(MusicStream) then
- MusicStream.GetFFTData(data);
-end;
-
-// Interface for Visualizer
-function TAudioPlayback_SoftMixer.GetPCMData(var data: TPCMData): Cardinal;
-begin
- if assigned(MusicStream) then
- Result := MusicStream.GetPCMData(data)
- else
- Result := 0;
-end;
-
-function TAudioPlayback_SoftMixer.OpenSound(const Filename: String): TAudioPlaybackStream;
-begin
- Result := Load(Filename);
-end;
-
-procedure TAudioPlayback_SoftMixer.PlaySound(stream: TAudioPlaybackStream);
-begin
- if assigned(stream) then
- stream.Play();
-end;
-
-procedure TAudioPlayback_SoftMixer.StopSound(stream: TAudioPlaybackStream);
-begin
- if assigned(stream) then
- stream.Stop();
-end;
-
-
-end.
+unit UAudioPlayback_SoftMixer; + +interface + +{$IFDEF FPC} + {$MODE Delphi} +{$ENDIF} + +{$I switches.inc} + + +uses + Classes, + SysUtils, + sdl, + UMusic; + +type + TAudioPlayback_SoftMixer = class; + + TSoftMixerPlaybackStream = class(TAudioPlaybackStream) + private + Engine: TAudioPlayback_SoftMixer; + + DecodeStream: TAudioDecodeStream; + SampleBuffer : PChar; + SampleBufferCount: integer; // number of available bytes in SampleBuffer + SampleBufferPos : cardinal; + BytesAvail: integer; + cvt: TSDL_AudioCVT; + + Status: TStreamStatus; + Loop: boolean; + _volume: integer; + + InternalLock: PSDL_Mutex; + + procedure Reset(); + + class function ConvertAudioFormatToSDL(fmt: TAudioSampleFormat): UInt16; + function InitFormatConversion(): boolean; + + procedure Lock(); {$IFDEF HasInline}inline;{$ENDIF} + procedure Unlock(); {$IFDEF HasInline}inline;{$ENDIF} + public + constructor Create(Engine: TAudioPlayback_SoftMixer); + destructor Destroy(); override; + + function SetDecodeStream(decodeStream: TAudioDecodeStream): boolean; + + procedure Play(); override; + procedure Pause(); override; + procedure Stop(); override; + procedure Close(); override; + function GetLoop(): boolean; override; + procedure SetLoop(Enabled: boolean); override; + function GetLength(): real; override; + function GetStatus(): TStreamStatus; override; + + function IsLoaded(): boolean; + + function GetVolume(): integer; override; + procedure SetVolume(Volume: integer); override; + + // functions delegated to the decode stream + function GetPosition: real; + procedure SetPosition(Time: real); + function ReadData(Buffer: PChar; BufSize: integer): integer; + + function GetPCMData(var data: TPCMData): Cardinal; + procedure GetFFTData(var data: TFFTData); + end; + + TAudioMixerStream = class + private + activeStreams: TList; + mixerBuffer: PChar; + internalLock: PSDL_Mutex; + + _volume: integer; + + procedure Lock(); {$IFDEF HasInline}inline;{$ENDIF} + procedure Unlock(); {$IFDEF HasInline}inline;{$ENDIF} + + function GetVolume(): integer; + procedure SetVolume(volume: integer); + public + constructor Create(); + destructor Destroy(); override; + procedure AddStream(stream: TAudioPlaybackStream); + procedure RemoveStream(stream: TAudioPlaybackStream); + function ReadData(Buffer: PChar; BufSize: integer): integer; + + property Volume: integer READ GetVolume WRITE SetVolume; + end; + + TAudioPlayback_SoftMixer = class( TInterfacedObject, IAudioPlayback ) + private + MusicStream: TSoftMixerPlaybackStream; + MixerStream: TAudioMixerStream; + protected + FormatInfo: TAudioFormatInfo; + + function InitializeAudioPlaybackEngine(): boolean; virtual; abstract; + function StartAudioPlaybackEngine(): boolean; virtual; abstract; + procedure StopAudioPlaybackEngine(); virtual; abstract; + procedure AudioCallback(buffer: PChar; size: integer); {$IFDEF HasInline}inline;{$ENDIF} + public + function GetName: String; virtual; abstract; + + function InitializePlayback(): boolean; + destructor Destroy; override; + + function Load(const Filename: String): TSoftMixerPlaybackStream; + + procedure SetVolume(Volume: integer); + procedure SetMusicVolume(Volume: integer); + procedure SetLoop(Enabled: boolean); + function Open(const Filename: string): boolean; // true if succeed + procedure Rewind; + procedure SetPosition(Time: real); + procedure Play; + procedure Pause; + + procedure Stop; + procedure Close; + function Finished: boolean; + function Length: real; + function GetPosition: real; + + // Equalizer + procedure GetFFTData(var data: TFFTData); + + // Interface for Visualizer + function GetPCMData(var data: TPCMData): Cardinal; + + function GetMixer(): TAudioMixerStream; {$IFDEF HasInline}inline;{$ENDIF} + function GetAudioFormatInfo(): TAudioFormatInfo; + + // Sounds + function OpenSound(const Filename: String): TAudioPlaybackStream; + procedure PlaySound(stream: TAudioPlaybackStream); + procedure StopSound(stream: TAudioPlaybackStream); + end; + +implementation + +uses + Math, + //samplerate, + UFFT, + ULog, + UIni, + UMain; + +{ TAudioMixerStream } + +constructor TAudioMixerStream.Create(); +begin + activeStreams := TList.Create; + internalLock := SDL_CreateMutex(); + _volume := 100; +end; + +destructor TAudioMixerStream.Destroy(); +begin + if assigned(mixerBuffer) then + Freemem(mixerBuffer); + activeStreams.Free; + SDL_DestroyMutex(internalLock); +end; + +procedure TAudioMixerStream.Lock(); +begin + SDL_mutexP(internalLock); +end; + +procedure TAudioMixerStream.Unlock(); +begin + SDL_mutexV(internalLock); +end; + +function TAudioMixerStream.GetVolume(): integer; +begin + Lock(); + result := _volume; + Unlock(); +end; + +procedure TAudioMixerStream.SetVolume(volume: integer); +begin + Lock(); + _volume := volume; + Unlock(); +end; + +procedure TAudioMixerStream.AddStream(stream: TAudioPlaybackStream); +begin + if not assigned(stream) then + Exit; + + Lock(); + // check if stream is already in list to avoid duplicates + if (activeStreams.IndexOf(Pointer(stream)) = -1) then + activeStreams.Add(Pointer(stream)); + Unlock(); +end; + +(* + * Sets the entry of stream in the activeStreams-List to nil + * but does not remove it from the list (count is not changed!). + * Otherwise iterations over the elements might fail due to a + * changed count-property. + * Call activeStreams.Pack() to remove the nil-pointers + * or check for nil-pointers when accessing activeStreams. + *) +procedure TAudioMixerStream.RemoveStream(stream: TAudioPlaybackStream); +var + index: integer; +begin + Lock(); + index := activeStreams.IndexOf(Pointer(stream)); + if (index <> -1) then + begin + // remove entry but do not decrease count-property + activeStreams[index] := nil; + end; + Unlock(); +end; + +function TAudioMixerStream.ReadData(Buffer: PChar; BufSize: integer): integer; +var + i: integer; + size: integer; + stream: TSoftMixerPlaybackStream; + appVolume: single; + needsPacking: boolean; +begin + result := BufSize; + + // zero target-buffer (silence) + FillChar(Buffer^, BufSize, 0); + + // resize mixer-buffer if necessary + ReallocMem(mixerBuffer, BufSize); + if not assigned(mixerBuffer) then + Exit; + + Lock(); + + // calc application volume + // use _volume instead of Volume to prevent recursive locking + appVolume := _volume / 100 * SDL_MIX_MAXVOLUME; + + needsPacking := false; + + // mix streams to one stream + for i := 0 to activeStreams.Count-1 do + begin + if (activeStreams[i] = nil) then + begin + needsPacking := true; + continue; + end; + + stream := TSoftMixerPlaybackStream(activeStreams[i]); + // fetch data from current stream + size := stream.ReadData(mixerBuffer, BufSize); + if (size > 0) then + begin + SDL_MixAudio(PUInt8(Buffer), PUInt8(mixerBuffer), size, + Trunc(appVolume * stream.Volume / 100)); + end; + end; + + // remove nil-pointers from list + if (needsPacking) then + begin + activeStreams.Pack(); + end; + + Unlock(); +end; + + +{ TSoftMixerPlaybackStream } + +constructor TSoftMixerPlaybackStream.Create(Engine: TAudioPlayback_SoftMixer); +begin + inherited Create(); + Self.Engine := Engine; + internalLock := SDL_CreateMutex(); + Reset(); +end; + +destructor TSoftMixerPlaybackStream.Destroy(); +begin + Close(); + SDL_DestroyMutex(internalLock); + inherited Destroy(); +end; + +procedure TSoftMixerPlaybackStream.Reset(); +begin + Stop(); + Loop := false; + // TODO: use DecodeStream.Unref() instead of Free(); + FreeAndNil(DecodeStream); + FreeMem(SampleBuffer); + SampleBuffer := nil; + SampleBufferPos := 0; + BytesAvail := 0; + _volume := 0; +end; + +procedure TSoftMixerPlaybackStream.Lock(); +begin + SDL_mutexP(internalLock); +end; + +procedure TSoftMixerPlaybackStream.Unlock(); +begin + SDL_mutexV(internalLock); +end; + +class function TSoftMixerPlaybackStream.ConvertAudioFormatToSDL(fmt: TAudioSampleFormat): UInt16; +begin + case fmt of + asfU8: Result := AUDIO_U8; + asfS8: Result := AUDIO_S8; + asfU16LSB: Result := AUDIO_U16LSB; + asfS16LSB: Result := AUDIO_S16LSB; + asfU16MSB: Result := AUDIO_U16MSB; + asfS16MSB: Result := AUDIO_S16MSB; + asfU16: Result := AUDIO_U16; + asfS16: Result := AUDIO_S16; + else Result := 0; + end; +end; + +function TSoftMixerPlaybackStream.InitFormatConversion(): boolean; +var + err: integer; + srcFormat: UInt16; + dstFormat: UInt16; + srcFormatInfo: TAudioFormatInfo; + dstFormatInfo: TAudioFormatInfo; +begin + Result := false; + + srcFormatInfo := DecodeStream.GetAudioFormatInfo(); + dstFormatInfo := Engine.GetAudioFormatInfo(); + + srcFormat := ConvertAudioFormatToSDL(srcFormatInfo.Format); + dstFormat := ConvertAudioFormatToSDL(dstFormatInfo.Format); + + if ((srcFormat = 0) or (dstFormat = 0)) then + begin + Log.LogError('Audio-format not supported by SDL', 'TSoftMixerPlaybackStream.InitFormatConversion'); + Exit; + end; + + if (SDL_BuildAudioCVT(@cvt, + srcFormat, srcFormatInfo.Channels, srcFormatInfo.SampleRate, + dstFormat, dstFormatInfo.Channels, dstFormatInfo.SampleRate) = -1) then + begin + Log.LogError(SDL_GetError(), 'TSoftMixerPlaybackStream.InitFormatConversion'); + Exit; + end; + + Result := true; +end; + +function TSoftMixerPlaybackStream.SetDecodeStream(decodeStream: TAudioDecodeStream): boolean; +begin + result := false; + + Reset(); + + if not assigned(decodeStream) then + Exit; + Self.DecodeStream := decodeStream; + if not InitFormatConversion() then + Exit; + + _volume := 100; + + result := true; +end; + +procedure TSoftMixerPlaybackStream.Close(); +begin + Reset(); +end; + +procedure TSoftMixerPlaybackStream.Play(); +var + mixer: TAudioMixerStream; +begin + if (status <> ssPaused) then + begin + // rewind + if assigned(DecodeStream) then + DecodeStream.Position := 0; + end; + status := ssPlaying; + + mixer := Engine.GetMixer(); + if (mixer <> nil) then + mixer.AddStream(Self); +end; + +procedure TSoftMixerPlaybackStream.Pause(); +var + mixer: TAudioMixerStream; +begin + status := ssPaused; + + mixer := Engine.GetMixer(); + if (mixer <> nil) then + mixer.RemoveStream(Self); +end; + +procedure TSoftMixerPlaybackStream.Stop(); +var + mixer: TAudioMixerStream; +begin + status := ssStopped; + + mixer := Engine.GetMixer(); + if (mixer <> nil) then + mixer.RemoveStream(Self); +end; + +function TSoftMixerPlaybackStream.IsLoaded(): boolean; +begin + result := assigned(DecodeStream); +end; + +function TSoftMixerPlaybackStream.GetLoop(): boolean; +begin + result := Loop; +end; + +procedure TSoftMixerPlaybackStream.SetLoop(Enabled: boolean); +begin + Loop := Enabled; +end; + +function TSoftMixerPlaybackStream.GetLength(): real; +begin + if assigned(DecodeStream) then + result := DecodeStream.Length + else + result := -1; +end; + +function TSoftMixerPlaybackStream.GetStatus(): TStreamStatus; +begin + result := status; +end; + +{* + * Note: 44.1kHz to 48kHz conversion or vice versa is not supported + * by SDL at the moment. No conversion takes place in this cases. + * This is because SDL just converts differences in powers of 2. + * So the result might not be that accurate. Although this is not + * audible in most cases it needs synchronization with the video + * or the lyrics timer. + * Using libsamplerate might give better results. + *} +function TSoftMixerPlaybackStream.ReadData(Buffer: PChar; BufSize: integer): integer; +var + decodeBufSize: integer; + sampleBufSize: integer; + nBytesDecoded: integer; + frameSize: integer; + remFrameBytes: integer; + copyCnt: integer; + BytesNeeded: integer; +begin + Result := -1; + + BytesNeeded := BufSize; + + // copy remaining data from the last call to the result-buffer + if (BytesAvail > 0) then + begin + copyCnt := Min(BufSize, BytesAvail); + Move(SampleBuffer[SampleBufferPos], Buffer[0], copyCnt); + Dec(BytesAvail, copyCnt); + Dec(BytesNeeded, copyCnt); + if (BytesNeeded = 0) then + begin + // Result-Buffer is full -> no need to decode more data. + // The sample-buffer might even contain some data for the next call + Inc(SampleBufferPos, copyCnt); + Result := BufSize; + Exit; + end; + end; + + if not assigned(DecodeStream) then + Exit; + + // calc number of bytes to decode + decodeBufSize := Ceil(BufSize / cvt.len_ratio); + // assure that the decode-size is a multiple of the frame size + frameSize := DecodeStream.GetAudioFormatInfo().FrameSize; + remFrameBytes := decodeBufSize mod frameSize; + if (remFrameBytes > 0) then + decodeBufSize := decodeBufSize + (frameSize - remFrameBytes); + + Lock(); + try + // calc buffer size + sampleBufSize := decodeBufSize * cvt.len_mult; + + // resize buffer if necessary. + // The required buffer-size will be smaller than the result-buffer + // in most cases (if the decoded signal is mono or has a lesser bitrate). + // If the output-rate is 44.1kHz and the decode-rate is 48kHz or 96kHz it + // will be ~1.09 or ~2.18 times bigger. Those extra memory consumption + // should be reasonable. If not we should call TDecodeStream.ReadData() + // multiple times. + // Note: we do not decrease the buffer by the count of bytes used from + // the previous call of this function (bytesAvail). Otherwise the + // buffer will be reallocated each time this function is called just to + // add or remove a few bytes from the buffer. + // By not doing this the buffer's size should be rather stable and it + // will not be reallocated/resized at all if the BufSize params does not + // change in consecutive calls. + ReallocMem(SampleBuffer, sampleBufSize); + if not assigned(SampleBuffer) then + Exit; + + // decode data + nBytesDecoded := DecodeStream.ReadData(SampleBuffer, decodeBufSize); + if (nBytesDecoded = -1) then + Exit; + + // end-of-file reached -> stop playback + if (DecodeStream.EOF) then + Stop(); + + // resample decoded data + cvt.buf := PUint8(SampleBuffer); + cvt.len := nBytesDecoded; + if (SDL_ConvertAudio(@cvt) = -1) then + Exit; + + SampleBufferCount := cvt.len_cvt; + finally + Unlock(); + end; + + BytesAvail := SampleBufferCount; + SampleBufferPos := 0; + + // copy data to result buffer + copyCnt := Min(BytesNeeded, BytesAvail); + Move(SampleBuffer[0], Buffer[BufSize - BytesNeeded], copyCnt); + Dec(BytesAvail, copyCnt); + Dec(BytesNeeded, copyCnt); + Inc(SampleBufferPos, copyCnt); + + Result := BufSize - BytesNeeded; +end; + +(* TODO: libsamplerate support +function TSoftMixerPlaybackStream.ReadData(Buffer: PChar; BufSize: integer): integer; +var + convState: PSRC_STATE; + convData: SRC_DATA; + error: integer; +begin + // Note: needs mono->stereo conversion, multi-channel->stereo, etc. + // maybe we should use SDL for the channel-conversion stuff + // and use libsamplerate afterwards for the frequency-conversion + + //convState := src_new(SRC_SINC_MEDIUM_QUALITY, 2, @error); + //src_short_to_float_array(input, output, len); + convData. + if (src_process(convState, @convData) <> 0) then + begin + Log.LogError(src_strerror(src_error(convState)), 'TSoftMixerPlaybackStream.ReadData'); + Exit; + end; + src_float_to_short_array(); + //src_delete(convState); +end; +*) + +function TSoftMixerPlaybackStream.GetPCMData(var data: TPCMData): Cardinal; +var + nBytes: integer; +begin + Result := 0; + + // just SInt16 stereo support for now + if ((Engine.GetAudioFormatInfo().Format <> asfS16) or + (Engine.GetAudioFormatInfo().Channels <> 2)) then + begin + Exit; + end; + + // zero memory + FillChar(data, SizeOf(data), 0); + + // TODO: At the moment just the first samples of the SampleBuffer + // are returned, even if there is newer data in the upper samples. + + Lock(); + nBytes := Min(SizeOf(data), SampleBufferCount); + if (nBytes > 0) then + begin + Move(SampleBuffer[0], data, nBytes); + end; + Unlock(); + + Result := nBytes div SizeOf(TPCMStereoSample); +end; + +procedure TSoftMixerPlaybackStream.GetFFTData(var data: TFFTData); +var + i: integer; + Frames: integer; + DataIn: PSingleArray; + AudioFormat: TAudioFormatInfo; +begin + // only works with SInt16 and Float values at the moment + AudioFormat := Engine.GetAudioFormatInfo(); + + DataIn := AllocMem(FFTSize * SizeOf(Single)); + if (DataIn = nil) then + Exit; + + Lock(); + // TODO: We just use the first Frames frames, the others are ignored. + // This is OK for the equalizer display but not if we want to use + // this function for voice-analysis someday (I don't think we want). + Frames := Min(FFTSize, SampleBufferCount div AudioFormat.FrameSize); + // use only first channel and convert data to float-values + case AudioFormat.Format of + asfS16: + begin + for i := 0 to Frames-1 do + DataIn[i] := PSmallInt(@SampleBuffer[i*AudioFormat.FrameSize])^ / -Low(SmallInt); + end; + asfFloat: + begin + for i := 0 to Frames-1 do + DataIn[i] := PSingle(@SampleBuffer[i*AudioFormat.FrameSize])^; + end; + end; + Unlock(); + + WindowFunc(fwfHanning, FFTSize, DataIn); + PowerSpectrum(FFTSize, DataIn, @data); + FreeMem(DataIn); + + // resize data to a 0..1 range + for i := 0 to High(TFFTData) do + begin + // TODO: this might need some work + data[i] := Sqrt(data[i]) / 100; + end; +end; + +function TSoftMixerPlaybackStream.GetPosition: real; +begin + if assigned(DecodeStream) then + result := DecodeStream.Position + else + result := -1; +end; + +procedure TSoftMixerPlaybackStream.SetPosition(Time: real); +begin + if assigned(DecodeStream) then + DecodeStream.Position := Time; +end; + +function TSoftMixerPlaybackStream.GetVolume(): integer; +begin + result := _volume; +end; + +procedure TSoftMixerPlaybackStream.SetVolume(volume: integer); +begin + // clamp volume + if (volume > 100) then + _volume := 100 + else if (volume < 0) then + _volume := 0 + else + _volume := volume; +end; + + +{ TAudioPlayback_SoftMixer } + +function TAudioPlayback_SoftMixer.InitializePlayback: boolean; +begin + result := false; + + //Log.LogStatus('InitializePlayback', 'UAudioPlayback_SoftMixer'); + + if(not InitializeAudioPlaybackEngine()) then + Exit; + + MixerStream := TAudioMixerStream.Create; + + if(not StartAudioPlaybackEngine()) then + Exit; + + result := true; +end; + +destructor TAudioPlayback_SoftMixer.Destroy; +begin + StopAudioPlaybackEngine(); + + FreeAndNil(MusicStream); + FreeAndNil(MixerStream); + FreeAndNil(FormatInfo); + + inherited Destroy(); +end; + +procedure TAudioPlayback_SoftMixer.AudioCallback(buffer: PChar; size: integer); +begin + MixerStream.ReadData(buffer, size); +end; + +function TAudioPlayback_SoftMixer.GetMixer(): TAudioMixerStream; +begin + Result := MixerStream; +end; + +function TAudioPlayback_SoftMixer.GetAudioFormatInfo(): TAudioFormatInfo; +begin + Result := FormatInfo; +end; + +function TAudioPlayback_SoftMixer.Load(const Filename: String): TSoftMixerPlaybackStream; +var + decodeStream: TAudioDecodeStream; + playbackStream: TSoftMixerPlaybackStream; +begin + Result := nil; + + decodeStream := AudioDecoder.Open(Filename); + if not assigned(decodeStream) then + begin + Log.LogStatus('LoadSoundFromFile: Sound not found "' + Filename + '"', 'UAudioPlayback_SoftMixer'); + Exit; + end; + + playbackStream := TSoftMixerPlaybackStream.Create(Self); + if (not playbackStream.SetDecodeStream(decodeStream)) then + Exit; + + result := playbackStream; +end; + +procedure TAudioPlayback_SoftMixer.SetVolume(Volume: integer); +begin + // sets volume only for this application + MixerStream.Volume := Volume; +end; + +procedure TAudioPlayback_SoftMixer.SetMusicVolume(Volume: Integer); +begin + if assigned(MusicStream) then + MusicStream.Volume := Volume; +end; + +procedure TAudioPlayback_SoftMixer.SetLoop(Enabled: boolean); +begin + if assigned(MusicStream) then + MusicStream.SetLoop(Enabled); +end; + +function TAudioPlayback_SoftMixer.Open(const Filename: string): boolean; +var + decodeStream: TAudioDecodeStream; +begin + Result := false; + + // free old MusicStream + MusicStream.Free(); + // and load new one + MusicStream := Load(Filename); + if not assigned(MusicStream) then + Exit; + + //Set Max Volume + SetMusicVolume(100); + + Result := true; +end; + +procedure TAudioPlayback_SoftMixer.Rewind; +begin + SetPosition(0); +end; + +procedure TAudioPlayback_SoftMixer.SetPosition(Time: real); +begin + if assigned(MusicStream) then + MusicStream.SetPosition(Time); +end; + +function TAudioPlayback_SoftMixer.GetPosition: real; +begin + if assigned(MusicStream) then + Result := MusicStream.GetPosition() + else + Result := -1; +end; + +function TAudioPlayback_SoftMixer.Length: real; +begin + if assigned(MusicStream) then + Result := MusicStream.GetLength() + else + Result := -1; +end; + +procedure TAudioPlayback_SoftMixer.Play; +begin + if assigned(MusicStream) then + MusicStream.Play(); +end; + +procedure TAudioPlayback_SoftMixer.Pause; +begin + if assigned(MusicStream) then + MusicStream.Pause(); +end; + +procedure TAudioPlayback_SoftMixer.Stop; +begin + if assigned(MusicStream) then + MusicStream.Stop(); +end; + +procedure TAudioPlayback_SoftMixer.Close; +begin + if assigned(MusicStream) then + begin + MusicStream.Close(); + end; +end; + +function TAudioPlayback_SoftMixer.Finished: boolean; +begin + if assigned(MusicStream) then + Result := (MusicStream.GetStatus() = ssStopped) + else + Result := true; +end; + +//Equalizer +procedure TAudioPlayback_SoftMixer.GetFFTData(var data: TFFTData); +begin + if assigned(MusicStream) then + MusicStream.GetFFTData(data); +end; + +// Interface for Visualizer +function TAudioPlayback_SoftMixer.GetPCMData(var data: TPCMData): Cardinal; +begin + if assigned(MusicStream) then + Result := MusicStream.GetPCMData(data) + else + Result := 0; +end; + +function TAudioPlayback_SoftMixer.OpenSound(const Filename: String): TAudioPlaybackStream; +begin + Result := Load(Filename); +end; + +procedure TAudioPlayback_SoftMixer.PlaySound(stream: TAudioPlaybackStream); +begin + if assigned(stream) then + stream.Play(); +end; + +procedure TAudioPlayback_SoftMixer.StopSound(stream: TAudioPlaybackStream); +begin + if assigned(stream) then + stream.Stop(); +end; + + +end. |