1 | from aubio import source, sink |
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2 | import os |
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3 | |
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4 | max_timestamp = 1e120 |
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5 | |
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6 | def slice_source_at_stamps(source_file, timestamps, timestamps_end = None, |
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7 | output_dir = None, |
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8 | samplerate = 0, |
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9 | hopsize = 256): |
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10 | |
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11 | if timestamps == None or len(timestamps) == 0: |
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12 | raise ValueError ("no timestamps given") |
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13 | |
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14 | if timestamps[0] != 0: |
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15 | timestamps = [0] + timestamps |
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16 | |
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17 | if timestamps_end != None and len(timestamps_end) != len(timestamps): |
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18 | raise ValueError ("len(timestamps_end) != len(timestamps)") |
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19 | else: |
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20 | timestamps_end = [t - 1 for t in timestamps[1:] ] + [ max_timestamp ] |
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21 | |
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22 | source_base_name, source_ext = os.path.splitext(os.path.basename(source_file)) |
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23 | if output_dir != None: |
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24 | if not os.path.isdir(output_dir): |
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25 | os.makedirs(output_dir) |
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26 | source_base_name = os.path.join(output_dir, source_base_name) |
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27 | |
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28 | def new_sink_name(source_base_name, timestamp, samplerate): |
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29 | timestamp_seconds = timestamp / float(samplerate) |
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30 | #print source_base_name + '_%02.3f' % (timestamp_seconds) + '.wav' |
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31 | return source_base_name + '_%02.3f' % (timestamp_seconds) + '.wav' |
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32 | |
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33 | # reopen source file |
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34 | s = source(source_file, samplerate, hopsize) |
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35 | if samplerate == 0: samplerate = s.get_samplerate() |
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36 | total_frames = 0 |
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37 | # get next region |
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38 | start_stamp = int(timestamps.pop(0)) |
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39 | end_stamp = int(timestamps_end.pop(0)) |
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40 | |
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41 | # create first sink |
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42 | new_sink_path = new_sink_name(source_base_name, start_stamp, samplerate) |
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43 | #print "new slice", total_frames, "+", remaining, "=", end_stamp |
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44 | g = sink(new_sink_path, samplerate) |
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45 | |
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46 | while True: |
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47 | # get hopsize new samples from source |
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48 | vec, read = s() |
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49 | # number of samples until end of region |
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50 | remaining = end_stamp - total_frames |
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51 | # not enough frames remaining, time to split |
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52 | if remaining < read: |
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53 | if remaining != 0: |
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54 | # write remaining samples from current region |
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55 | g(vec[0:remaining], remaining) |
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56 | # close this file |
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57 | del g |
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58 | # get the next region |
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59 | start_stamp = int(timestamps.pop(0)) |
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60 | end_stamp = int(timestamps_end.pop(0)) |
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61 | # create a new file for the new region |
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62 | new_sink_path = new_sink_name(source_base_name, start_stamp, samplerate) |
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63 | #print "new slice", total_frames, "+", remaining, "=", end_stamp |
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64 | g = sink(new_sink_path, samplerate) |
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65 | # write the remaining samples in the new file |
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66 | g(vec[remaining:read], read - remaining) |
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67 | elif read > 0: |
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68 | # write all the samples |
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69 | g(vec[0:read], read) |
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70 | total_frames += read |
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71 | if read < hopsize: break |
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72 | |
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73 | # close the last file |
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74 | del g |
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