diff options
Diffstat (limited to 'Game/Code/Classes/UAudioPlayback_SoftMixer.pas')
| -rw-r--r-- | Game/Code/Classes/UAudioPlayback_SoftMixer.pas | 1132 |
1 files changed, 0 insertions, 1132 deletions
diff --git a/Game/Code/Classes/UAudioPlayback_SoftMixer.pas b/Game/Code/Classes/UAudioPlayback_SoftMixer.pas deleted file mode 100644 index 6ddae980..00000000 --- a/Game/Code/Classes/UAudioPlayback_SoftMixer.pas +++ /dev/null @@ -1,1132 +0,0 @@ -unit UAudioPlayback_SoftMixer; - -interface - -{$IFDEF FPC} - {$MODE Delphi} -{$ENDIF} - -{$I switches.inc} - - -uses - Classes, - SysUtils, - sdl, - URingBuffer, - UMusic, - UAudioPlaybackBase; - -type - TAudioPlayback_SoftMixer = class; - - TGenericPlaybackStream = class(TAudioPlaybackStream) - private - Engine: TAudioPlayback_SoftMixer; - - SampleBuffer: PChar; - SampleBufferSize: integer; - SampleBufferCount: integer; // number of available bytes in SampleBuffer - SampleBufferPos: cardinal; - - SourceBuffer: PChar; - SourceBufferSize: integer; - SourceBufferCount: integer; // number of available bytes in SourceBuffer - - Converter: TAudioConverter; - Status: TStreamStatus; - InternalLock: PSDL_Mutex; - SoundEffects: TList; - fVolume: single; - - FadeInStartTime, FadeInTime: cardinal; - FadeInStartVolume, FadeInTargetVolume: single; - - NeedsRewind: boolean; - - procedure Reset(); - - procedure ApplySoundEffects(Buffer: PChar; BufferSize: integer); - function InitFormatConversion(): boolean; - procedure FlushBuffers(); - - procedure LockSampleBuffer(); {$IFDEF HasInline}inline;{$ENDIF} - procedure UnlockSampleBuffer(); {$IFDEF HasInline}inline;{$ENDIF} - protected - function GetLatency(): double; override; - function GetStatus(): TStreamStatus; override; - function GetVolume(): single; override; - procedure SetVolume(Volume: single); override; - function GetLength(): real; override; - function GetLoop(): boolean; override; - procedure SetLoop(Enabled: boolean); override; - function GetPosition: real; override; - procedure SetPosition(Time: real); override; - public - constructor Create(Engine: TAudioPlayback_SoftMixer); - 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; - - function GetAudioFormatInfo(): TAudioFormatInfo; override; - - function ReadData(Buffer: PChar; BufferSize: integer): integer; - - function GetPCMData(var Data: TPCMData): Cardinal; override; - procedure GetFFTData(var Data: TFFTData); override; - - procedure AddSoundEffect(Effect: TSoundEffect); override; - procedure RemoveSoundEffect(Effect: TSoundEffect); override; - end; - - TAudioMixerStream = class - private - Engine: TAudioPlayback_SoftMixer; - - ActiveStreams: TList; - MixerBuffer: PChar; - InternalLock: PSDL_Mutex; - - AppVolume: single; - - procedure Lock(); {$IFDEF HasInline}inline;{$ENDIF} - procedure Unlock(); {$IFDEF HasInline}inline;{$ENDIF} - - function GetVolume(): single; - procedure SetVolume(Volume: single); - public - constructor Create(Engine: TAudioPlayback_SoftMixer); - destructor Destroy(); override; - procedure AddStream(Stream: TAudioPlaybackStream); - procedure RemoveStream(Stream: TAudioPlaybackStream); - function ReadData(Buffer: PChar; BufferSize: integer): integer; - - property Volume: single read GetVolume write SetVolume; - end; - - TAudioPlayback_SoftMixer = class(TAudioPlaybackBase) - private - MixerStream: TAudioMixerStream; - protected - FormatInfo: TAudioFormatInfo; - - function InitializeAudioPlaybackEngine(): boolean; virtual; abstract; - function StartAudioPlaybackEngine(): boolean; virtual; abstract; - procedure StopAudioPlaybackEngine(); virtual; abstract; - function FinalizeAudioPlaybackEngine(): boolean; virtual; abstract; - procedure AudioCallback(Buffer: PChar; Size: integer); {$IFDEF HasInline}inline;{$ENDIF} - - function CreatePlaybackStream(): TAudioPlaybackStream; override; - public - function GetName: String; override; abstract; - function InitializePlayback(): boolean; override; - function FinalizePlayback: boolean; override; - - procedure SetAppVolume(Volume: single); override; - - function CreateVoiceStream(ChannelMap: integer; FormatInfo: TAudioFormatInfo): TAudioVoiceStream; override; - - function GetMixer(): TAudioMixerStream; {$IFDEF HasInline}inline;{$ENDIF} - function GetAudioFormatInfo(): TAudioFormatInfo; - - procedure MixBuffers(DstBuffer, SrcBuffer: PChar; Size: Cardinal; Volume: Single); virtual; - end; - -type - TGenericVoiceStream = class(TAudioVoiceStream) - private - VoiceBuffer: TRingBuffer; - BufferLock: PSDL_Mutex; - PlaybackStream: TGenericPlaybackStream; - Engine: TAudioPlayback_SoftMixer; - public - constructor Create(Engine: TAudioPlayback_SoftMixer); - - function Open(ChannelMap: integer; FormatInfo: TAudioFormatInfo): boolean; override; - procedure Close(); override; - procedure WriteData(Buffer: PChar; BufferSize: integer); override; - function ReadData(Buffer: PChar; BufferSize: integer): integer; override; - function IsEOF(): boolean; override; - function IsError(): boolean; override; - end; - -const - SOURCE_BUFFER_FRAMES = 4096; - -const - MAX_VOICE_DELAY = 0.500; // 20ms - -implementation - -uses - Math, - ULog, - UIni, - UFFT, - UAudioConverter, - UMain; - -{ TAudioMixerStream } - -constructor TAudioMixerStream.Create(Engine: TAudioPlayback_SoftMixer); -begin - inherited Create(); - - Self.Engine := Engine; - - ActiveStreams := TList.Create; - InternalLock := SDL_CreateMutex(); - AppVolume := 1.0; -end; - -destructor TAudioMixerStream.Destroy(); -begin - if assigned(MixerBuffer) then - Freemem(MixerBuffer); - ActiveStreams.Free; - SDL_DestroyMutex(InternalLock); - inherited; -end; - -procedure TAudioMixerStream.Lock(); -begin - SDL_mutexP(InternalLock); -end; - -procedure TAudioMixerStream.Unlock(); -begin - SDL_mutexV(InternalLock); -end; - -function TAudioMixerStream.GetVolume(): single; -begin - Lock(); - Result := AppVolume; - Unlock(); -end; - -procedure TAudioMixerStream.SetVolume(Volume: single); -begin - Lock(); - AppVolume := 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; BufferSize: integer): integer; -var - i: integer; - Size: integer; - Stream: TGenericPlaybackStream; - NeedsPacking: boolean; -begin - Result := BufferSize; - - // zero target-buffer (silence) - FillChar(Buffer^, BufferSize, 0); - - // resize mixer-buffer if necessary - ReallocMem(MixerBuffer, BufferSize); - if not assigned(MixerBuffer) then - Exit; - - Lock(); - - 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 := TGenericPlaybackStream(ActiveStreams[i]); - // fetch data from current stream - Size := Stream.ReadData(MixerBuffer, BufferSize); - if (Size > 0) then - begin - // mix stream-data with mixer-buffer - // Note: use Self.appVolume instead of Self.Volume to prevent recursive locking - Engine.MixBuffers(Buffer, MixerBuffer, Size, AppVolume * Stream.Volume); - end; - end; - - // remove nil-pointers from list - if (NeedsPacking) then - begin - ActiveStreams.Pack(); - end; - - Unlock(); -end; - - -{ TGenericPlaybackStream } - -constructor TGenericPlaybackStream.Create(Engine: TAudioPlayback_SoftMixer); -begin - inherited Create(); - Self.Engine := Engine; - InternalLock := SDL_CreateMutex(); - SoundEffects := TList.Create; - Status := ssStopped; - Reset(); -end; - -destructor TGenericPlaybackStream.Destroy(); -begin - Close(); - SDL_DestroyMutex(InternalLock); - FreeAndNil(SoundEffects); - inherited; -end; - -procedure TGenericPlaybackStream.Reset(); -begin - SourceStream := nil; - - FreeAndNil(Converter); - - FreeMem(SampleBuffer); - SampleBuffer := nil; - SampleBufferPos := 0; - SampleBufferSize := 0; - SampleBufferCount := 0; - - FreeMem(SourceBuffer); - SourceBuffer := nil; - SourceBufferSize := 0; - SourceBufferCount := 0; - - NeedsRewind := false; - - fVolume := 0; - SoundEffects.Clear; - FadeInTime := 0; -end; - -function TGenericPlaybackStream.Open(SourceStream: TAudioSourceStream): boolean; -begin - Result := false; - - Close(); - - if (not assigned(SourceStream)) then - Exit; - Self.SourceStream := SourceStream; - - if (not InitFormatConversion()) then - begin - // reset decode-stream so it will not be freed on destruction - Self.SourceStream := nil; - Exit; - end; - - SourceBufferSize := SOURCE_BUFFER_FRAMES * SourceStream.GetAudioFormatInfo().FrameSize; - GetMem(SourceBuffer, SourceBufferSize); - fVolume := 1.0; - - Result := true; -end; - -procedure TGenericPlaybackStream.Close(); -begin - // stop audio-callback on this stream - Stop(); - - // Note: PerformOnClose must be called before SourceStream is invalidated - PerformOnClose(); - // and free data - Reset(); -end; - -procedure TGenericPlaybackStream.LockSampleBuffer(); -begin - SDL_mutexP(InternalLock); -end; - -procedure TGenericPlaybackStream.UnlockSampleBuffer(); -begin - SDL_mutexV(InternalLock); -end; - -function TGenericPlaybackStream.InitFormatConversion(): boolean; -var - SrcFormatInfo: TAudioFormatInfo; - DstFormatInfo: TAudioFormatInfo; -begin - Result := false; - - SrcFormatInfo := SourceStream.GetAudioFormatInfo(); - DstFormatInfo := GetAudioFormatInfo(); - - // TODO: selection should not be done here, use a factory (TAudioConverterFactory) instead - {$IF Defined(UseFFmpegResample)} - Converter := TAudioConverter_FFmpeg.Create(); - {$ELSEIF Defined(UseSRCResample)} - Converter := TAudioConverter_SRC.Create(); - {$ELSE} - Converter := TAudioConverter_SDL.Create(); - {$IFEND} - - Result := Converter.Init(SrcFormatInfo, DstFormatInfo); -end; - -procedure TGenericPlaybackStream.Play(); -var - Mixer: TAudioMixerStream; -begin - // only paused streams are not flushed - if (Status = ssPaused) then - NeedsRewind := false; - - // 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 - SetPosition(0); - - // update status - Status := ssPlaying; - - NeedsRewind := true; - - // add this stream to the mixer - Mixer := Engine.GetMixer(); - if (Mixer <> nil) then - Mixer.AddStream(Self); -end; - -procedure TGenericPlaybackStream.FadeIn(Time: real; TargetVolume: single); -begin - FadeInTime := Trunc(Time * 1000); - FadeInStartTime := SDL_GetTicks(); - FadeInStartVolume := fVolume; - FadeInTargetVolume := TargetVolume; - Play(); -end; - -procedure TGenericPlaybackStream.Pause(); -var - Mixer: TAudioMixerStream; -begin - if (Status <> ssPlaying) then - Exit; - - Status := ssPaused; - - Mixer := Engine.GetMixer(); - if (Mixer <> nil) then - Mixer.RemoveStream(Self); -end; - -procedure TGenericPlaybackStream.Stop(); -var - Mixer: TAudioMixerStream; -begin - if (Status = ssStopped) then - Exit; - - Status := ssStopped; - - Mixer := Engine.GetMixer(); - if (Mixer <> nil) then - Mixer.RemoveStream(Self); -end; - -function TGenericPlaybackStream.GetLoop(): boolean; -begin - if assigned(SourceStream) then - Result := SourceStream.Loop - else - Result := false; -end; - -procedure TGenericPlaybackStream.SetLoop(Enabled: boolean); -begin - if assigned(SourceStream) then - SourceStream.Loop := Enabled; -end; - -function TGenericPlaybackStream.GetLength(): real; -begin - if assigned(SourceStream) then - Result := SourceStream.Length - else - Result := -1; -end; - -function TGenericPlaybackStream.GetLatency(): double; -begin - Result := Engine.GetLatency(); -end; - -function TGenericPlaybackStream.GetStatus(): TStreamStatus; -begin - Result := Status; -end; - -function TGenericPlaybackStream.GetAudioFormatInfo(): TAudioFormatInfo; -begin - Result := Engine.GetAudioFormatInfo(); -end; - -procedure TGenericPlaybackStream.FlushBuffers(); -begin - SampleBufferCount := 0; - SampleBufferPos := 0; - SourceBufferCount := 0; -end; - -procedure TGenericPlaybackStream.ApplySoundEffects(Buffer: PChar; BufferSize: integer); -var - i: integer; -begin - for i := 0 to SoundEffects.Count-1 do - begin - if (SoundEffects[i] <> nil) then - begin - TSoundEffect(SoundEffects[i]).Callback(Buffer, BufferSize); - end; - end; -end; - -function TGenericPlaybackStream.ReadData(Buffer: PChar; BufferSize: integer): integer; -var - ConversionInputCount: integer; - ConversionOutputSize: integer; // max. number of converted data (= buffer size) - ConversionOutputCount: integer; // actual number of converted data - SourceSize: integer; - RequestedSourceSize: integer; - NeededSampleBufferSize: integer; - BytesNeeded, BytesAvail: integer; - SourceFormatInfo, OutputFormatInfo: TAudioFormatInfo; - SourceFrameSize, OutputFrameSize: integer; - SkipOutputCount: integer; // number of output-data bytes to skip - SkipSourceCount: integer; // number of source-data bytes to skip - FillCount: integer; // number of bytes to fill with padding data - CopyCount: integer; - PadFrame: PChar; - i: integer; -begin - Result := -1; - - // sanity check for the source-stream - if (not assigned(SourceStream)) then - Exit; - - SkipOutputCount := 0; - SkipSourceCount := 0; - FillCount := 0; - - SourceFormatInfo := SourceStream.GetAudioFormatInfo(); - SourceFrameSize := SourceFormatInfo.FrameSize; - OutputFormatInfo := GetAudioFormatInfo(); - OutputFrameSize := OutputFormatInfo.FrameSize; - - // synchronize (adjust buffer size) - BytesNeeded := Synchronize(BufferSize, OutputFormatInfo); - if (BytesNeeded > BufferSize) then - begin - SkipOutputCount := BytesNeeded - BufferSize; - BytesNeeded := BufferSize; - end - else if (BytesNeeded < BufferSize) then - begin - FillCount := BufferSize - BytesNeeded; - end; - - // lock access to sample-buffer - LockSampleBuffer(); - try - - // skip sample-buffer data - SampleBufferPos := SampleBufferPos + SkipOutputCount; - // size of available bytes in SampleBuffer after skipping - SampleBufferCount := SampleBufferCount - SampleBufferPos; - // update byte skip-count - SkipOutputCount := -SampleBufferCount; - - // now that we skipped all buffered data from the last pass, we have to skip - // data directly after fetching it from the source-stream. - if (SkipOutputCount > 0) then - begin - SampleBufferCount := 0; - // convert skip-count to source-format units and resize to a multiple of - // the source frame-size. - SkipSourceCount := Round((SkipOutputCount * OutputFormatInfo.GetRatio(SourceFormatInfo)) / - SourceFrameSize) * SourceFrameSize; - SkipOutputCount := 0; - end; - - // copy data to front of buffer - if ((SampleBufferCount > 0) and (SampleBufferPos > 0)) then - Move(SampleBuffer[SampleBufferPos], SampleBuffer[0], SampleBufferCount); - SampleBufferPos := 0; - - // resize buffer to a reasonable size - if (BufferSize > SampleBufferCount) then - begin - // Note: use BufferSize instead of BytesNeeded to minimize the need for resizing - SampleBufferSize := BufferSize; - ReallocMem(SampleBuffer, SampleBufferSize); - if (not assigned(SampleBuffer)) then - Exit; - end; - - // fill sample-buffer (fetch and convert one block of source data per loop) - while (SampleBufferCount < BytesNeeded) do - begin - // move remaining source data from the previous pass to front of buffer - if (SourceBufferCount > 0) then - begin - Move(SourceBuffer[SourceBufferSize-SourceBufferCount], - SourceBuffer[0], - SourceBufferCount); - end; - - SourceSize := SourceStream.ReadData( - @SourceBuffer[SourceBufferCount], SourceBufferSize-SourceBufferCount); - // break on error (-1) or if no data is available (0), e.g. while seeking - if (SourceSize <= 0) then - begin - // if we do not have data -> exit - if (SourceBufferCount = 0) then - begin - FlushBuffers(); - Exit; - end; - // if we have some data, stop retrieving data from the source stream - // and use the data we have so far - Break; - end; - - SourceBufferCount := SourceBufferCount + SourceSize; - - // end-of-file reached -> stop playback - if (SourceStream.EOF) then - begin - if (Loop) then - SourceStream.Position := 0 - else - Stop(); - end; - - if (SkipSourceCount > 0) then - begin - // skip data and update source buffer count - SourceBufferCount := SourceBufferCount - SkipSourceCount; - SkipSourceCount := -SourceBufferCount; - // continue with next pass if we skipped all data - if (SourceBufferCount <= 0) then - begin - SourceBufferCount := 0; - Continue; - end; - end; - - // calc buffer size (might be bigger than actual resampled byte count) - ConversionOutputSize := Converter.GetOutputBufferSize(SourceBufferCount); - NeededSampleBufferSize := SampleBufferCount + ConversionOutputSize; - - // resize buffer if necessary - if (SampleBufferSize < NeededSampleBufferSize) then - begin - SampleBufferSize := NeededSampleBufferSize; - ReallocMem(SampleBuffer, SampleBufferSize); - if (not assigned(SampleBuffer)) then - begin - FlushBuffers(); - Exit; - end; - end; - - // resample source data (Note: ConversionInputCount might be adjusted by Convert()) - ConversionInputCount := SourceBufferCount; - ConversionOutputCount := Converter.Convert( - SourceBuffer, @SampleBuffer[SampleBufferCount], ConversionInputCount); - if (ConversionOutputCount = -1) then - begin - FlushBuffers(); - Exit; - end; - - // adjust sample- and source-buffer count by the number of converted bytes - SampleBufferCount := SampleBufferCount + ConversionOutputCount; - SourceBufferCount := SourceBufferCount - ConversionInputCount; - end; - - // apply effects - ApplySoundEffects(SampleBuffer, SampleBufferCount); - - // copy data to result buffer - CopyCount := Min(BytesNeeded, SampleBufferCount); - Move(SampleBuffer[0], Buffer[BufferSize - BytesNeeded], CopyCount); - Dec(BytesNeeded, CopyCount); - SampleBufferPos := CopyCount; - - // release buffer lock - finally - UnlockSampleBuffer(); - end; - - // pad the buffer with the last frame if we are to fast - if (FillCount > 0) then - begin - if (CopyCount >= OutputFrameSize) then - PadFrame := @Buffer[CopyCount-OutputFrameSize] - else - PadFrame := nil; - FillBufferWithFrame(@Buffer[CopyCount], FillCount, - PadFrame, OutputFrameSize); - end; - - // BytesNeeded now contains the number of remaining bytes we were not able to fetch - Result := BufferSize - BytesNeeded; -end; - -function TGenericPlaybackStream.GetPCMData(var Data: TPCMData): Cardinal; -var - ByteCount: 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. - - LockSampleBuffer(); - ByteCount := Min(SizeOf(Data), SampleBufferCount); - if (ByteCount > 0) then - begin - Move(SampleBuffer[0], Data, ByteCount); - end; - UnlockSampleBuffer(); - - Result := ByteCount div SizeOf(TPCMStereoSample); -end; - -procedure TGenericPlaybackStream.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 := GetAudioFormatInfo(); - - DataIn := AllocMem(FFTSize * SizeOf(Single)); - if (DataIn = nil) then - Exit; - - LockSampleBuffer(); - // TODO: We just use the first Frames frames, the others are ignored. - 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; - UnlockSampleBuffer(); - - 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 - Data[i] := Sqrt(Data[i]) / 100; - end; -end; - -procedure TGenericPlaybackStream.AddSoundEffect(Effect: TSoundEffect); -begin - if (not assigned(Effect)) then - Exit; - - LockSampleBuffer(); - // check if effect is already in list to avoid duplicates - if (SoundEffects.IndexOf(Pointer(Effect)) = -1) then - SoundEffects.Add(Pointer(Effect)); - UnlockSampleBuffer(); -end; - -procedure TGenericPlaybackStream.RemoveSoundEffect(Effect: TSoundEffect); -begin - LockSampleBuffer(); - SoundEffects.Remove(Effect); - UnlockSampleBuffer(); -end; - -function TGenericPlaybackStream.GetPosition: real; -var - BufferedTime: double; -begin - if assigned(SourceStream) then - begin - LockSampleBuffer(); - - // calc the time of source data that is buffered (in the SampleBuffer and SourceBuffer) - // but not yet outputed - BufferedTime := (SampleBufferCount - SampleBufferPos) / Engine.FormatInfo.BytesPerSec + - SourceBufferCount / SourceStream.GetAudioFormatInfo().BytesPerSec; - // and subtract it from the source position - Result := SourceStream.Position - BufferedTime; - - UnlockSampleBuffer(); - end - else - begin - Result := -1; - end; -end; - -procedure TGenericPlaybackStream.SetPosition(Time: real); -begin - if assigned(SourceStream) then - begin - LockSampleBuffer(); - - SourceStream.Position := Time; - if (Status = ssStopped) then - NeedsRewind := false; - // do not use outdated data - FlushBuffers(); - - AvgSyncDiff := -1; - - UnlockSampleBuffer(); - end; -end; - -function TGenericPlaybackStream.GetVolume(): single; -var - FadeAmount: Single; -begin - LockSampleBuffer(); - // adjust volume if fading is enabled - if (FadeInTime > 0) then - begin - FadeAmount := (SDL_GetTicks() - FadeInStartTime) / FadeInTime; - // check if fade-target is reached - if (FadeAmount >= 1) then - begin - // target reached -> stop fading - FadeInTime := 0; - fVolume := FadeInTargetVolume; - end - else - begin - // fading in progress - fVolume := FadeAmount*FadeInTargetVolume + (1-FadeAmount)*FadeInStartVolume; - end; - end; - // return current volume - Result := fVolume; - UnlockSampleBuffer(); -end; - -procedure TGenericPlaybackStream.SetVolume(Volume: single); -begin - LockSampleBuffer(); - // stop fading - FadeInTime := 0; - // clamp volume - if (Volume > 1.0) then - fVolume := 1.0 - else if (Volume < 0) then - fVolume := 0 - else - fVolume := Volume; - UnlockSampleBuffer(); -end; - - -{ TGenericVoiceStream } - -constructor TGenericVoiceStream.Create(Engine: TAudioPlayback_SoftMixer); -begin - inherited Create(); - Self.Engine := Engine; -end; - -function TGenericVoiceStream.Open(ChannelMap: integer; FormatInfo: TAudioFormatInfo): boolean; -var - BufferSize: integer; -begin - Result := false; - - Close(); - - if (not inherited Open(ChannelMap, FormatInfo)) then - Exit; - - // Note: - // - use Self.FormatInfo instead of FormatInfo as the latter one might have a - // channel size of 2. - // - the buffer-size must be a multiple of the FrameSize - BufferSize := (Ceil(MAX_VOICE_DELAY * Self.FormatInfo.BytesPerSec) div Self.FormatInfo.FrameSize) * - Self.FormatInfo.FrameSize; - VoiceBuffer := TRingBuffer.Create(BufferSize); - - BufferLock := SDL_CreateMutex(); - - - // create a matching playback stream for the voice-stream - PlaybackStream := TGenericPlaybackStream.Create(Engine); - // link voice- and playback-stream - if (not PlaybackStream.Open(Self)) then - begin - PlaybackStream.Free; - Exit; - end; - - // start voice passthrough - PlaybackStream.Play(); - - Result := true; -end; - -procedure TGenericVoiceStream.Close(); -begin - // stop and free the playback stream - FreeAndNil(PlaybackStream); - - // free data - FreeAndNil(VoiceBuffer); - if (BufferLock <> nil) then - SDL_DestroyMutex(BufferLock); - - inherited Close(); -end; - -procedure TGenericVoiceStream.WriteData(Buffer: PChar; BufferSize: integer); -begin - // lock access to buffer - SDL_mutexP(BufferLock); - try - if (VoiceBuffer = nil) then - Exit; - VoiceBuffer.Write(Buffer, BufferSize); - finally - SDL_mutexV(BufferLock); - end; -end; - -function TGenericVoiceStream.ReadData(Buffer: PChar; BufferSize: integer): integer; -begin - Result := -1; - - // lock access to buffer - SDL_mutexP(BufferLock); - try - if (VoiceBuffer = nil) then - Exit; - Result := VoiceBuffer.Read(Buffer, BufferSize); - finally - SDL_mutexV(BufferLock); - end; -end; - -function TGenericVoiceStream.IsEOF(): boolean; -begin - SDL_mutexP(BufferLock); - Result := (VoiceBuffer = nil); - SDL_mutexV(BufferLock); -end; - -function TGenericVoiceStream.IsError(): boolean; -begin - Result := false; -end; - - -{ TAudioPlayback_SoftMixer } - -function TAudioPlayback_SoftMixer.InitializePlayback: boolean; -begin - Result := false; - - //Log.LogStatus('InitializePlayback', 'UAudioPlayback_SoftMixer'); - - if(not InitializeAudioPlaybackEngine()) then - Exit; - - MixerStream := TAudioMixerStream.Create(Self); - - if(not StartAudioPlaybackEngine()) then - Exit; - - Result := true; -end; - -function TAudioPlayback_SoftMixer.FinalizePlayback: boolean; -begin - Close; - StopAudioPlaybackEngine(); - - FreeAndNil(MixerStream); - FreeAndNil(FormatInfo); - - FinalizeAudioPlaybackEngine(); - inherited FinalizePlayback; - Result := true; -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.CreatePlaybackStream(): TAudioPlaybackStream; -begin - Result := TGenericPlaybackStream.Create(Self); -end; - -function TAudioPlayback_SoftMixer.CreateVoiceStream(ChannelMap: integer; FormatInfo: TAudioFormatInfo): TAudioVoiceStream; -var - VoiceStream: TGenericVoiceStream; -begin - Result := nil; - - // create a voice stream - VoiceStream := TGenericVoiceStream.Create(Self); - if (not VoiceStream.Open(ChannelMap, FormatInfo)) then - begin - VoiceStream.Free; - Exit; - end; - - Result := VoiceStream; -end; - -procedure TAudioPlayback_SoftMixer.SetAppVolume(Volume: single); -begin - // sets volume only for this application - MixerStream.Volume := Volume; -end; - -procedure TAudioPlayback_SoftMixer.MixBuffers(DstBuffer, SrcBuffer: PChar; Size: Cardinal; Volume: Single); -var - SampleIndex: Cardinal; - SampleInt: Integer; - SampleFlt: Single; -begin - SampleIndex := 0; - case FormatInfo.Format of - asfS16: - begin - while (SampleIndex < Size) do - begin - // apply volume and sum with previous mixer value - SampleInt := PSmallInt(@DstBuffer[SampleIndex])^ + - Round(PSmallInt(@SrcBuffer[SampleIndex])^ * Volume); - // clip result - if (SampleInt > High(SmallInt)) then - SampleInt := High(SmallInt) - else if (SampleInt < Low(SmallInt)) then - SampleInt := Low(SmallInt); - // assign result - PSmallInt(@DstBuffer[SampleIndex])^ := SampleInt; - // increase index by one sample - Inc(SampleIndex, SizeOf(SmallInt)); - end; - end; - asfFloat: - begin - while (SampleIndex < Size) do - begin - // apply volume and sum with previous mixer value - SampleFlt := PSingle(@DstBuffer[SampleIndex])^ + - PSingle(@SrcBuffer[SampleIndex])^ * Volume; - // clip result - if (SampleFlt > 1.0) then - SampleFlt := 1.0 - else if (SampleFlt < -1.0) then - SampleFlt := -1.0; - // assign result - PSingle(@DstBuffer[SampleIndex])^ := SampleFlt; - // increase index by one sample - Inc(SampleIndex, SizeOf(Single)); - end; - end; - else - begin - Log.LogError('Incompatible format', 'TAudioMixerStream.MixAudio'); - end; - end; -end; - -end. |