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| 1 | +#! /usr/bin/env python | |
| 2 | + | |
| 3 | +from aubio import source, tempo | |
| 4 | +from numpy import median, diff | |
| 5 | + | |
| 6 | +def get_file_bpm(path, params = {}): | |
| 7 | + """ Calculate the beats per minute (bpm) of a given file. | |
| 8 | + path: path to the file | |
| 9 | + param: dictionary of parameters | |
| 10 | + """ | |
| 11 | + try: | |
| 12 | + win_s = params['win_s'] | |
| 13 | + samplerate = params['samplerate'] | |
| 14 | + hop_s = params['hop_s'] | |
| 15 | + except: | |
| 16 | + """ | |
| 17 | + # super fast | |
| 18 | + samplerate, win_s, hop_s = 4000, 128, 64 | |
| 19 | + # fast | |
| 20 | + samplerate, win_s, hop_s = 8000, 512, 128 | |
| 21 | + """ | |
| 22 | + # default: | |
| 23 | + samplerate, win_s, hop_s = 44100, 1024, 512 | |
| 24 | + | |
| 25 | + s = source(path, samplerate, hop_s) | |
| 26 | + samplerate = s.samplerate | |
| 27 | + o = tempo("specdiff", win_s, hop_s, samplerate) | |
| 28 | + # List of beats, in samples | |
| 29 | + beats = [] | |
| 30 | + # Total number of frames read | |
| 31 | + total_frames = 0 | |
| 32 | + | |
| 33 | + while True: | |
| 34 | + samples, read = s() | |
| 35 | + is_beat = o(samples) | |
| 36 | + if is_beat: | |
| 37 | + this_beat = o.get_last_s() | |
| 38 | + beats.append(this_beat) | |
| 39 | + #if o.get_confidence() > .2 and len(beats) > 2.: | |
| 40 | + # break | |
| 41 | + total_frames += read | |
| 42 | + if read < hop_s: | |
| 43 | + break | |
| 44 | + | |
| 45 | + # Convert to periods and to bpm | |
| 46 | + bpms = 60./diff(beats) | |
| 47 | + b = median(bpms) | |
| 48 | + return b | |
| 49 | + | |
| 50 | +if __name__ == '__main__': | |
| 51 | + import sys | |
| 52 | + for f in sys.argv[1:]: | |
| 53 | + bpm = get_file_bpm(f) | |
| 54 | + print "%6s" % ("%.2f" % bpm), f | |