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Diffstat (limited to '')
-rw-r--r-- | src/media/UAudioPlayback_SDL.pas | 182 |
1 files changed, 0 insertions, 182 deletions
diff --git a/src/media/UAudioPlayback_SDL.pas b/src/media/UAudioPlayback_SDL.pas deleted file mode 100644 index 8403ef03..00000000 --- a/src/media/UAudioPlayback_SDL.pas +++ /dev/null @@ -1,182 +0,0 @@ -{* 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_SDL; - -interface - -{$IFDEF FPC} - {$MODE Delphi} -{$ENDIF} - -{$I switches.inc} - -implementation - -uses - Classes, - sdl, - SysUtils, - UAudioPlayback_SoftMixer, - UMusic, - ULog, - UIni, - UMain; - -type - TAudioPlayback_SDL = class(TAudioPlayback_SoftMixer) - private - Latency: double; - function EnumDevices(): boolean; - protected - function InitializeAudioPlaybackEngine(): boolean; override; - function StartAudioPlaybackEngine(): boolean; override; - procedure StopAudioPlaybackEngine(); override; - function FinalizeAudioPlaybackEngine(): boolean; override; - function GetLatency(): double; override; - public - function GetName: String; override; - procedure MixBuffers(dst, src: PByteArray; size: Cardinal; volume: Single); override; - end; - - -{ TAudioPlayback_SDL } - -procedure SDLAudioCallback(userdata: Pointer; stream: PByteArray; len: integer); cdecl; -var - Engine: TAudioPlayback_SDL; -begin - Engine := TAudioPlayback_SDL(userdata); - Engine.AudioCallback(stream, len); -end; - -function TAudioPlayback_SDL.GetName: String; -begin - Result := 'SDL_Playback'; -end; - -function TAudioPlayback_SDL.EnumDevices(): boolean; -begin - // Note: SDL does not provide Device-Selection capabilities (will be introduced in 1.3) - ClearOutputDeviceList(); - SetLength(OutputDeviceList, 1); - OutputDeviceList[0] := TAudioOutputDevice.Create(); - OutputDeviceList[0].Name := '[SDL Default-Device]'; - Result := true; -end; - -function TAudioPlayback_SDL.InitializeAudioPlaybackEngine(): boolean; -var - DesiredAudioSpec, ObtainedAudioSpec: TSDL_AudioSpec; - SampleBufferSize: integer; -begin - Result := false; - - EnumDevices(); - - if (SDL_InitSubSystem(SDL_INIT_AUDIO) = -1) then - begin - Log.LogError('SDL_InitSubSystem failed!', 'TAudioPlayback_SDL.InitializeAudioPlaybackEngine'); - Exit; - end; - - SampleBufferSize := IAudioOutputBufferSizeVals[Ini.AudioOutputBufferSizeIndex]; - if (SampleBufferSize <= 0) then - begin - // Automatic setting default - // FIXME: too much glitches with 1024 samples - SampleBufferSize := 2048; //1024; - end; - - FillChar(DesiredAudioSpec, SizeOf(DesiredAudioSpec), 0); - with DesiredAudioSpec do - begin - freq := 44100; - format := AUDIO_S16SYS; - channels := 2; - samples := SampleBufferSize; - callback := @SDLAudioCallback; - userdata := Self; - end; - - // Note: always use the "obtained" parameter, otherwise SDL might try to convert - // the samples itself if the desired format is not available. This might lead - // to problems if for example ALSA does not support 44100Hz and proposes 48000Hz. - // Without the obtained parameter, SDL would try to convert 44.1kHz to 48kHz with - // its crappy (non working) converter resulting in a wrong (too high) pitch. - if(SDL_OpenAudio(@DesiredAudioSpec, @ObtainedAudioSpec) = -1) then - begin - Log.LogStatus('SDL_OpenAudio: ' + SDL_GetError(), 'TAudioPlayback_SDL.InitializeAudioPlaybackEngine'); - Exit; - end; - - FormatInfo := TAudioFormatInfo.Create( - ObtainedAudioSpec.channels, - ObtainedAudioSpec.freq, - asfS16 - ); - - // Note: SDL does not provide info of the internal buffer state. - // So we use the average buffer-size. - Latency := (ObtainedAudioSpec.samples/2) / FormatInfo.SampleRate; - - Log.LogStatus('Opened audio device', 'TAudioPlayback_SDL.InitializeAudioPlaybackEngine'); - - Result := true; -end; - -function TAudioPlayback_SDL.StartAudioPlaybackEngine(): boolean; -begin - SDL_PauseAudio(0); - Result := true; -end; - -procedure TAudioPlayback_SDL.StopAudioPlaybackEngine(); -begin - SDL_PauseAudio(1); -end; - -function TAudioPlayback_SDL.FinalizeAudioPlaybackEngine(): boolean; -begin - SDL_CloseAudio(); - SDL_QuitSubSystem(SDL_INIT_AUDIO); - Result := true; -end; - -function TAudioPlayback_SDL.GetLatency(): double; -begin - Result := Latency; -end; - -procedure TAudioPlayback_SDL.MixBuffers(dst, src: PByteArray; size: Cardinal; volume: Single); -begin - SDL_MixAudio(PUInt8(dst), PUInt8(src), size, Round(volume * SDL_MIX_MAXVOLUME)); -end; - - -initialization - MediaManager.add(TAudioPlayback_SDL.Create); - -end. |