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https://github.com/libretro/gambatte-libretro.git
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5bbabdcfdd
fourier transforms and optimal cost equations. Fast 2-tap linear as a low quality alternative. - libgambatte: Use deltas and a running sum to decrease buffer writes in sound emulation sample generation. - libgambatte: Rearrange sound emulation event loop to optimize for high-frequency event units. - libgambatte: Initialize palette arrays to avoid valgrind noise. - Don't do resampling in libgambatte. Update API to reflect this. - Move non-emulation common code to a common directory to avoid duplication. - Update front-ends to new libgambatte API. - Utilize resampling framework in front-ends. Selectable resamplers. - Improved adaptive sleep class that estimates oversleep. - Gambatte SDL: Estimate actual output sample rate in terms of OS timers and derive frame rate from it. - Gambatte SDL: Move AudioData and RingBuffer classes to separate files. - Gambatte SDL: Make underruns slightly less painful, by resetting buffer positions. - Gambatte Qt: Update AudioEngine to support sample rate estimation in terms of OS timers. - Gambatte Qt: Implement sample rate estimation in ALSA and OSS audio engines. - Gambatte Qt: AlsaEngine: Revert to using snd_pcm_avail_update for buffer status since snd_pcm_delay may consider external latencies. - Gambatte Qt: AlsaEngine: Use snd_pcm_hw_params_set_buffer_time_near. Don't request a particular number of periods per buffer. - Gambatte Qt: AlsaEngine: Use hw as default custom device string, rather than hw:0,0. - Gambatte Qt: OssEngine: Don't trust GETOSPACE fragment info. - Gambatte Qt: Estimate optimal frame rate based on sample rate estimations. - Gambatte Qt: Extend BlitterWidget to support estimation of vsynced frame rate in terms of OS timers. - Gambatte Qt: Implement vsync frame rate estimation in QGlBlitter, Direct3DBlitter and DirectDrawBlitter. - Gambatte Qt: Use a combination of OS timer sample rate estimation and vsync frame rate estimation to derive resampling ratio for no-frame-duplication vsync. - Gambatte Qt: Change API to reflect MediaSources not being responsible for resampling. - Gambatte Qt: Make sure to parent PaletteDialog list model, so it gets deleted properly. - Various refactoring, small changes and stuff I forgot. git-svn-id: https://gambatte.svn.sourceforge.net/svnroot/gambatte@165 9dfb2916-2d38-0410-aef4-c5fe6c9ffc24
57 lines
2.2 KiB
C++
57 lines
2.2 KiB
C++
/***************************************************************************
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* Copyright (C) 2008 by Sindre Aamås *
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* aamas@stud.ntnu.no *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License version 2 as *
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* published by the Free Software Foundation. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License version 2 for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* version 2 along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#include "adaptivesleep.h"
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usec_t AdaptiveSleep::sleepUntil(usec_t base, usec_t inc) {
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usec_t now = getusecs();
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usec_t diff = now - base;
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if (diff >= inc)
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return diff - inc;
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diff = inc - diff;
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if (diff > oversleep + oversleepVar) {
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diff -= oversleep + oversleepVar;
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usecsleep(diff);
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const usec_t ideal = now + diff;
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now = getusecs();
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{
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usec_t curOversleep = now - ideal;
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if (negate(curOversleep) < curOversleep)
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curOversleep = 0;
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oversleepVar = (oversleepVar * 15 + (curOversleep < oversleep ? oversleep - curOversleep : curOversleep - oversleep)) >> 4;
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oversleep = (oversleep * 15 + curOversleep) >> 4;
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}
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noSleep = 60;
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} else if (--noSleep == 0) {
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noSleep = 60;
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oversleep = oversleepVar = 0;
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}
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while (now - base < inc)
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now = getusecs();
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return 0;
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}
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