pstruebi
efb55050c0
- 1kHz test tone added - all audio file converted to lc3 to save space - streaming loop for lc3 files fixed @pober Reviewed-on: #27 Co-authored-by: pstruebi <struebin.patrick@gmail.com> Co-committed-by: pstruebi <struebin.patrick@gmail.com>
32 lines
1.0 KiB
Python
32 lines
1.0 KiB
Python
import logging
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import struct
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def read_lc3_file(filepath):
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filepath = filepath.replace('file:', '')
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with open(filepath, 'rb') as f_lc3:
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header = struct.unpack('=HHHHHHHI', f_lc3.read(18))
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if header[0] != 0xcc1c:
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raise ValueError('Invalid bitstream file')
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# found in liblc3 - decoder.py
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samplerate = header[2] * 100
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nchannels = header[4]
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frame_duration = header[5] * 10
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stream_length = header[7]
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#lc3_frame_size = struct.unpack('=H', f_lc3.read(2))[0]
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logging.info('Loaded lc3 file: %s', filepath)
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logging.info('samplerate: %s', samplerate)
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logging.info('nchannels %s', nchannels)
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logging.info('frame_duration %s', frame_duration)
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logging.info('stream_length %s', stream_length)
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chunks = []
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while True:
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b = f_lc3.read(2)
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if b == b'':
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break
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lc3_frame_size = struct.unpack('=H', b)[0]
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chunks.append(f_lc3.read(lc3_frame_size))
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return b''.join(chunks) |