c9bcbe202d
Creates a standard buffer passing, local data passing and messaging system for processing stages. Stages can be moved to their own source files to reduce clutter and ease assimilation of new ones. dsp.c becomes dsp_core.c which supports an engine and framework for effects. Formats and change notifications are passed along with the buffer so that they arrive at the correct time at each stage in the chain regardless of the internal delays of a particular one. Removes restrictions on the number of samples that can be processed at a time and it pays attention to destination buffer size restrictions without having to limit input count, which also allows pcmbuf to remain fuller and safely set its own buffer limits as it sees fit. There is no longer a need to query input/output counts given a certain number of input samples; just give it the sizes of the source and destination buffers. Works in harmony with stages that are not deterministic in terms of sample input/output ratio (like both resamplers but most notably the timestretch). As a result it fixes quirks with timestretch hanging up with certain settings and it now operates properly throughout its full settings range. Change-Id: Ib206ec78f6f6c79259c5af9009fe021d68be9734 Reviewed-on: http://gerrit.rockbox.org/200 Reviewed-by: Michael Sevakis <jethead71@rockbox.org> Tested-by: Michael Sevakis <jethead71@rockbox.org>
43 lines
1.8 KiB
C
43 lines
1.8 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2006 by Nicolas Pitre <nico@cam.org>
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* Copyright (C) 2006-2007 by Stéphane Doyon <s.doyon@videotron.ca>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef _TDSPEED_H
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#define _TDSPEED_H
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/* some #define functions to get the pitch, stretch and speed values based
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* upon two known values. Remember that params are alphabetical. */
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#define GET_SPEED(pitch, stretch) \
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((pitch * stretch + PITCH_SPEED_100 / 2L) / PITCH_SPEED_100)
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#define GET_PITCH(speed, stretch) \
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((speed * PITCH_SPEED_100 + stretch / 2L) / stretch)
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#define GET_STRETCH(pitch, speed) \
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((speed * PITCH_SPEED_100 + pitch / 2L) / pitch)
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#define STRETCH_MAX (250L * PITCH_SPEED_PRECISION) /* 250% */
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#define STRETCH_MIN (35L * PITCH_SPEED_PRECISION) /* 35% */
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void dsp_timestretch_enable(bool enable);
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void dsp_set_timestretch(int32_t percent);
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int32_t dsp_get_timestretch(void);
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bool dsp_timestretch_available(void);
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#endif /* _TDSPEED_H */
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