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https://github.com/cookiengineer/audacity
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58 lines
2.5 KiB
Plaintext
58 lines
2.5 KiB
Plaintext
Content
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=======
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libsbsms is a library for high quality time and pitch scale modification. It uses octave subband sinusoidal modeling.
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sbsms has optional support for libsndfile(--enable-sndfile) and libmad(--enable-mp3) for reading(.wav and .mp3) and writing(.wav) files, and optional support for portaudio for playing .sbsms format files(--enable-portaudio) with sbsmsplay.
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The API is found in sbsms.h. sbsms_create is called and supplied a callback which feeds sbsms_process samples. The pitch_create and pitch_process functions are called only if pitch shifting is required. It simply sticks a resampler on the end of the FIFO.
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A program called sbsms is included. It reads PCM files such as .wav and .aif (and .mp3 files if --enable-mp3), and writes .wav files using libsndfile. The usage is:
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sbsms infile outfile rate-start rate-end halfsteps-start halfsteps-end <quality>
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For example:
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sbsms blob.wav blobOut.wav .5 .5 0 2
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will slow down blob.wav by a factor of 2, while simultaneously sliding the pitch up two half-steps, and put the output in blobOut.wav
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Without sndfile support, the sbsms program will read text files in the format:
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%g %g\n
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...
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and write output in the same format.
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sbsms can also write .sbsms format files:
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sbsms blob.wav blob.sbsms 1 1 0 0
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which can be quickly rendered into .wav files at a new rate/pitch:
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sbsms blob.sbsms blobOut.wav .5 .5 0 2
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or played in realtime with sbsmsplay (if --enable-portaudio):
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sbsmsplay blob.sbsms .5 .5 0 2
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NOTE:
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When reading the output from sbsms, you must determine a stopping condition for yourself, as the library zero pads the output ad infinitum and never returns 0 samples. The simplest method for doing so is found in test.cpp.
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Clayton Otey (otey@users.sourceforge.net)
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Requirements
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============
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POSIX systems (e.g. Linux, OS X):
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---------------------------------
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You need at least to have libtool installed to be able to build the
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library with "./configure && make".
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Compiling
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=========
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Call './configure && make' on the console to compile the library, all
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tools and demo applications, documentation and install them with
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'make install'. The latter has to be called as root.
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If you are compiling from CVS you have to call 'make -f Makefile.cvs'
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to generate all autotools build files before calling
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'./configure && make'.
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You can use 'make distclean' and probably 'make -f Makefile.cvs clean'
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to clean up everything again. The latter will also delete all automatic
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generated autools build files. |