a8d0c51c69
* DSP: Implement Pipe 2 Pipe 2 is a DSP pipe that is used to initialize both the DSP hardware (the application signals to the DSP to initialize) and the application (the DSP provides the memory location of structures in the shared memory region). * AudioCore: Implement codecs (DecodeADPCM, DecodePCM8, DecodePCM16) * DSP Pipes: Implement as FIFO * AudioCore: File structure * AudioCore: More structure * AudioCore: Buffer management * DSP/Source: Reorganise Source's AdvanceFrame. * Audio Output * lolidk * huh? * interp * More interp stuff * oops * Zero State * Don't mix Source frame if it's not enabled * DSP: Forgot to zero a buffer, adjusted thread synchronisation, adjusted format spec for buffers * asdf * Get it to compile and tweak stretching a bit. * revert stretch test * deleted accidental partial catch submodule commit * new audio stretching algorithm * update .gitmodule * fix OS X build * remove getopt from rubberband * #include <stddef> to audio_core.h * typo * -framework Accelerate * OptionTransientsSmooth -> OptionTransientsCrisp * tweak stretch tempo smoothing coefficient. also switch back to smooth. * tweak mroe * remove printf * sola * #include <cmath> * VERY QUICK MERGE TO GET IT WORKING DOESN'T ACTIVATE AUDIO FILTERS * Reminder to self * fix comparison * common/thread: Correct code style * Thread: Make Barrier reusable * fix threading synchonisation code * add profiling code * print error to console when audio clips * fix metallic sound * reduce logspam
97 lines
4.1 KiB
C++
97 lines
4.1 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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///
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/// The routine detects highest value on an array of values and calculates the
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/// precise peak location as a mass-center of the 'hump' around the peak value.
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///
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/// Author : Copyright (c) Olli Parviainen
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/// Author e-mail : oparviai 'at' iki.fi
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/// SoundTouch WWW: http://www.surina.net/soundtouch
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///
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////////////////////////////////////////////////////////////////////////////////
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//
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// Last changed : $Date: 2011-12-30 22:33:46 +0200 (Fri, 30 Dec 2011) $
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// File revision : $Revision: 4 $
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//
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// $Id: PeakFinder.h 132 2011-12-30 20:33:46Z oparviai $
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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// License :
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//
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// SoundTouch audio processing library
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// Copyright (c) Olli Parviainen
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library 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 GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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////////////////////////////////////////////////////////////////////////////////
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#ifndef _PeakFinder_H_
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#define _PeakFinder_H_
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namespace soundtouch
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{
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class PeakFinder
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{
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protected:
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/// Min, max allowed peak positions within the data vector
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int minPos, maxPos;
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/// Calculates the mass center between given vector items.
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double calcMassCenter(const float *data, ///< Data vector.
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int firstPos, ///< Index of first vector item beloging to the peak.
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int lastPos ///< Index of last vector item beloging to the peak.
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) const;
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/// Finds the data vector index where the monotoniously decreasing signal crosses the
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/// given level.
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int findCrossingLevel(const float *data, ///< Data vector.
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float level, ///< Goal crossing level.
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int peakpos, ///< Peak position index within the data vector.
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int direction /// Direction where to proceed from the peak: 1 = right, -1 = left.
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) const;
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// Finds real 'top' of a peak hump from neighnourhood of the given 'peakpos'.
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int findTop(const float *data, int peakpos) const;
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/// Finds the 'ground' level, i.e. smallest level between two neighbouring peaks, to right-
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/// or left-hand side of the given peak position.
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int findGround(const float *data, /// Data vector.
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int peakpos, /// Peak position index within the data vector.
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int direction /// Direction where to proceed from the peak: 1 = right, -1 = left.
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) const;
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/// get exact center of peak near given position by calculating local mass of center
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double getPeakCenter(const float *data, int peakpos) const;
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public:
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/// Constructor.
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PeakFinder();
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/// Detect exact peak position of the data vector by finding the largest peak 'hump'
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/// and calculating the mass-center location of the peak hump.
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///
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/// \return The location of the largest base harmonic peak hump.
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double detectPeak(const float *data, /// Data vector to be analyzed. The data vector has
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/// to be at least 'maxPos' items long.
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int minPos, ///< Min allowed peak location within the vector data.
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int maxPos ///< Max allowed peak location within the vector data.
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);
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};
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}
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#endif // _PeakFinder_H_
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