1 SoundTouch sound processing library v1.01
2 =========================================
3 Copyright (c) Olli Parviainen 2002
5 A library for changing tempo, pitch and playback rate of digital sound.
8 SoundStretch sound processing application v1.1
9 ==============================================
10 Copyright (c) Olli Parviainen 2002-2003
12 A command-line application for changing tempo, pitch and playback rates
13 of WAV sound files. This program also demonstrates how the "SoundTouch"
14 library can be used to process sound in own programs.
17 SoundStretch Usage Instructions
18 ===============================
20 SoundStretch Usage syntax:
21 soundstretch infile.wav outfile.wav [switches]
25 "infile.wav" is the name of the input sound data file (in .WAV audio
28 "outfile.wav" is the name of the output sound file where the resulting
29 sound is saved (in .WAV audio file format).
31 [switches] are one or more control switches.
33 Available control switches are:
35 -tempo=n : Change sound tempo by n percents (n = -95.0 .. +5000.0 %)
37 -pitch=n : Change sound pitch by n semitones (n = -60.0 .. + 60.0 semitones)
39 -rate=n : Change sound playback rate by n percents (n = -95.0 .. +5000.0 %)
41 -bpm=n : Detect the Beats-Per-Minute (BPM) rate of the sound and adjust the
42 tempo to meet 'n' BPMs. If this switch is defined, the "-tempo=n"
43 switch value is ignored.
45 If "=n" is omitted, i.e. switch "-bpm" is used alone, the
46 program just calculates and displays the BPM rate but doesn't
47 adjust tempo according to the BPM value.
49 -quick : Use quicker tempo change algorithm. Gains speed but loses sound
52 -naa : Don't use anti-alias filtering in samplerate transposing. Gains
53 speed but loses sound quality.
55 -license : Displays the program license text (GPL)
58 * The numerical switch values can be entered using either integer (e.g.
59 "-tempo=123") or decimal (e.g. "-tempo=123.45") numbers.
61 * The "-naa" and/or "-quick" switches can be used to reduce CPU usage
62 while compromising some sound quality
64 * The BPM detection algorithm works by detecting repeating low-frequency
65 (<250Hz) sound patterns and thus works mostly with most rock/pop music
66 with bass or drum beat. The BPM detection doesn't work on pieces such
67 as classical music without distinct, repeating bass frequency patterns.
68 Also pieces with varying tempo, varying bass patterns or very complex
69 bass patterns (jazz, hiphop) may produce odd BPM readings.
71 In cases when the bass pattern drifts a bit around a nominal beat rate
72 (e.g. drummer is again drunken :), the BPM algorithm may report incorrect
73 harmonic one-halft of one-thirdth of the correct BPM value; in such case
74 the system could for example report BPM value of 50 or 100 instead of
75 correct BPM value of 150.
84 The following command increases tempo of the sound file "originalfile.wav"
85 by 12.5% and saves result to file "destinationfile.wav":
87 soundstretch originalfile.wav destinationfile.wav -tempo=12.5
93 The following command decreases the sound pitch (key) of the sound file
94 "orig.wav" by two semitones and saves the result to file "dest.wav":
96 soundstretch orig.wav dest.wav -pitch=-2
102 The following command processes the file "orig.wav" by decreasing the
103 sound tempo by 25.3% and increasing the sound pitch (key) by 1.5 semitones.
104 Result is saved to file "dest.wav":
106 soundstretch orig.wav dest.wav -tempo=-25.3 -pitch=1.5
112 The following command detects the BPM rate of the file "orig.wav" and
113 adjusts the tempo to match 100 beats per minute. Result is saved to
116 soundstretch orig.wav dest.wav -bpm=100
120 Building Instructions
121 =====================
123 The package contains executable binaries for Win32 platform in the "bin"
126 To build the library and application executable for other platforms or to
127 re-build the delivered binaries, run either of the scripts in the package
130 "make-win.bat" for Microsoft Windows environment, or
131 "make-gcc" for GNU/Linux or Unix environment with a gcc compiler.
139 SoundTouch library Change History
140 =================================
143 - "mmx_gcc.cpp": Added "using namespace std" and removed "return 0" from a
144 function with void return value to fix compiler errors when compiling
145 the library in Solaris environment.
147 - Moved file "FIFOSampleBuffer.h" to "include" directory to allow accessing
148 the FIFOSampleBuffer class from external files.
150 v1.0: Initial release
153 SoundStretch application Change History
154 =======================================
157 - Fixed "Release" settings in Microsoft Visual C++ project file (.dsp)
159 - Added beats-per-minute (BPM) detection routine and command-line switch
162 v1.01: Initial release
168 Many thanks to Stuart Lamble for translating the MMX optimizations from
169 MS Visual C++ syntax into gcc syntax for joy of all Linux users.
171 Thanks also to Manish Bajpai, whose WAV file reading routines I've used
172 as base of the WavInFile & WavOutFile classes, that are being used in
173 the soundstrecth program for accessing WAV audio files.
179 This program is free software; you can redistribute it and/or modify it
180 under the terms of the GNU General Public License as published by the
181 Free Software Foundation; either version 2 of the License, or (at your
182 option) any later version.
184 This program is distributed in the hope that it will be useful, but
185 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
186 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
189 You should have received a copy of the GNU General Public License along
190 with this program; if not, write to the Free Software Foundation, Inc., 59
191 Temple Place, Suite 330, Boston, MA 02111-1307 USA