SoundTouch sound processing library v1.01 ========================================= Copyright (c) Olli Parviainen 2002 A library for changing tempo, pitch and playback rate of digital sound. SoundStretch sound processing application v1.1 ============================================== Copyright (c) Olli Parviainen 2002-2003 A command-line application for changing tempo, pitch and playback rates of WAV sound files. This program also demonstrates how the "SoundTouch" library can be used to process sound in own programs. SoundStretch Usage Instructions =============================== SoundStretch Usage syntax: soundstretch infile.wav outfile.wav [switches] Where: "infile.wav" is the name of the input sound data file (in .WAV audio file format). "outfile.wav" is the name of the output sound file where the resulting sound is saved (in .WAV audio file format). [switches] are one or more control switches. Available control switches are: -tempo=n : Change sound tempo by n percents (n = -95.0 .. +5000.0 %) -pitch=n : Change sound pitch by n semitones (n = -60.0 .. + 60.0 semitones) -rate=n : Change sound playback rate by n percents (n = -95.0 .. +5000.0 %) -bpm=n : Detect the Beats-Per-Minute (BPM) rate of the sound and adjust the tempo to meet 'n' BPMs. If this switch is defined, the "-tempo=n" switch value is ignored. If "=n" is omitted, i.e. switch "-bpm" is used alone, the program just calculates and displays the BPM rate but doesn't adjust tempo according to the BPM value. -quick : Use quicker tempo change algorithm. Gains speed but loses sound quality. -naa : Don't use anti-alias filtering in samplerate transposing. Gains speed but loses sound quality. -license : Displays the program license text (GPL) Notes: * The numerical switch values can be entered using either integer (e.g. "-tempo=123") or decimal (e.g. "-tempo=123.45") numbers. * The "-naa" and/or "-quick" switches can be used to reduce CPU usage while compromising some sound quality * The BPM detection algorithm works by detecting repeating low-frequency (<250Hz) sound patterns and thus works mostly with most rock/pop music with bass or drum beat. The BPM detection doesn't work on pieces such as classical music without distinct, repeating bass frequency patterns. Also pieces with varying tempo, varying bass patterns or very complex bass patterns (jazz, hiphop) may produce odd BPM readings. In cases when the bass pattern drifts a bit around a nominal beat rate (e.g. drummer is again drunken :), the BPM algorithm may report incorrect harmonic one-halft of one-thirdth of the correct BPM value; in such case the system could for example report BPM value of 50 or 100 instead of correct BPM value of 150. Usage examples: =============== Example 1 ========= The following command increases tempo of the sound file "originalfile.wav" by 12.5% and saves result to file "destinationfile.wav": soundstretch originalfile.wav destinationfile.wav -tempo=12.5 Example 2 ========= The following command decreases the sound pitch (key) of the sound file "orig.wav" by two semitones and saves the result to file "dest.wav": soundstretch orig.wav dest.wav -pitch=-2 Example 3 ========= The following command processes the file "orig.wav" by decreasing the sound tempo by 25.3% and increasing the sound pitch (key) by 1.5 semitones. Result is saved to file "dest.wav": soundstretch orig.wav dest.wav -tempo=-25.3 -pitch=1.5 Example 4 ========= The following command detects the BPM rate of the file "orig.wav" and adjusts the tempo to match 100 beats per minute. Result is saved to file "dest.wav": soundstretch orig.wav dest.wav -bpm=100 Building Instructions ===================== The package contains executable binaries for Win32 platform in the "bin" directory. To build the library and application executable for other platforms or to re-build the delivered binaries, run either of the scripts in the package root directory: "make-win.bat" for Microsoft Windows environment, or "make-gcc" for GNU/Linux or Unix environment with a gcc compiler. Change History ============== SoundTouch library Change History ================================= v1.01: - "mmx_gcc.cpp": Added "using namespace std" and removed "return 0" from a function with void return value to fix compiler errors when compiling the library in Solaris environment. - Moved file "FIFOSampleBuffer.h" to "include" directory to allow accessing the FIFOSampleBuffer class from external files. v1.0: Initial release SoundStretch application Change History ======================================= v1.1: - Fixed "Release" settings in Microsoft Visual C++ project file (.dsp) - Added beats-per-minute (BPM) detection routine and command-line switch "-bpm" v1.01: Initial release Acknowledgements ================ Many thanks to Stuart Lamble for translating the MMX optimizations from MS Visual C++ syntax into gcc syntax for joy of all Linux users. Thanks also to Manish Bajpai, whose WAV file reading routines I've used as base of the WavInFile & WavOutFile classes, that are being used in the soundstrecth program for accessing WAV audio files. LICENSE: ======== 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.\n" You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA