pkmFFT
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Published
20 hours ago •
clindsey
clindsey
Audio analysis including real FFT/IFFT/STFT/ISTFT, MFCC/LFCC, and Segmentation; Concatenative synthesis using Nearest Neighbor tree
- Real FFT wraper for Apple's Accelerate Framework
- and STFT implementation making use of Apple's Accelerate Framework (pkmFFT)
- Created by Parag K. Mital - http://pkmital.com
- Contact: [email protected]
- Copyright 2011 Parag K. Mital. All rights reserved.
- Permission is hereby granted, free of charge, to any person
- obtaining a copy of this software and associated documentation
- files (the "Software"), to deal in the Software without
- restriction, including without limitation the rights to use,
- copy, modify, merge, publish, distribute, sublicense, and/or sell
- copies of the Software, and to permit persons to whom the
- Software is furnished to do so, subject to the following
- conditions:
- The above copyright notice and this permission notice shall be
- included in all copies or substantial portions of the Software.
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
- OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
- HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
- WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
- OTHER DEALINGS IN THE SOFTWARE.
- Additional resources:
-
http://developer.apple.com/library/ios/#documentation/Accelerate/Reference/vDSPRef/Reference/reference.html -
http://developer.apple.com/library/ios/#documentation/Performance/Conceptual/vDSP_Programming_Guide/SampleCode/SampleCode.html -
http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework -
http://stackoverflow.com/questions/1964955/audio-file-fft-in-an-os-x-environment - This code is a very simple interface for Accelerate's fft/ifft code.
- It was built out of hacking Maximilian (Mick Grierson and Chris Kiefer) and
- the above mentioned resources for performing a windowed FFT which could
- be used underneath of an STFT implementation
- FFT Usage:
- // be sure to either use malloc or attribute ((aligned (16))
- float *sample_data = (float *) malloc (sizeof(float) * 4096);
- float *allocated_magnitude_buffer = (float *) malloc (sizeof(float) * 2048);
- float *allocated_phase_buffer = (float *) malloc (sizeof(float) * 2048);
- pkmFFT *fft;
- fft = new pkmFFT(4096);
- fft.forward(0, sample_data, allocated_magnitude_buffer, allocated_phase_buffer);
- fft.inverse(0, sample_data, allocated_magnitude_buffer, allocated_phase_buffer);
- delete fft;
- STFT Usage:
- // be sure to either use malloc or attribute ((aligned (16))
- size_t buffer_size = 4096;
- float *sample_data = (float *) malloc (sizeof(float) * buffer_size);
- pkm::Mat magnitude_matrix, phase_matrix;
- pkmSTFT *stft;
- stft = new pkmSTFT(512);
- stft.STFT(sample_data, buffer_size, magnitude_matrix, phase_matrix);
- fft.ISTFT(sample_data, buffer_size, magnitude_matrix, phase_matrix);
- delete stft;
clindsey