mirror of https://github.com/trudnai/Steve2.git
60 lines
2.8 KiB
Python
60 lines
2.8 KiB
Python
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#!/usr/local/bin/python3
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### Convert SPKR Buffer to WAV -- (c) by Tamas Rudnai 2022
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###
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### This utility convert SPKR buffer output to an uncompressed WAV file
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###
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### Purpose is that sound generation can be analyzed by audio editor - Audacity for example
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###
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import os
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import sys
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import struct
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# binpath = '/Users/trudnai/Library/Containers/com.trudnai.steveii/Data/'
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# binfilename = binpath + 'steve2_audio_debug.bin'
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def convert_bin_to_audio(filename):
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data_size = os.path.getsize(filename)
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channels = 2
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sample_rate = 1023000 # 192000 # must be the same as in speaker.c : spkr_sample_rate
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bits_per_sample = 16
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header_size = 44
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with open( filename, 'rb') as binfile:
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wavfilename = os.path.splitext( os.path.basename(filename) )[0] + '.wav'
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with open( wavfilename, 'wb+') as wavfile:
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# WAV HEADER
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wavfile.write( 'RIFF'.encode() ) # Marks the file as a riff file. Characters are each 1 byte long
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wavfile.write( struct.pack('I', data_size + header_size ) ) # Size of the overall file - 8 bytes, in bytes (32-bit integer). Typically you’d fill this in after creation
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wavfile.write( 'WAVE'.encode() ) # File Type Header. For our purposes, it always equals “WAVE”
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# FMT HEADER
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wavfile.write( 'fmt '.encode() ) # Format chunk marker. Includes trailing null (tr: Space works, null don't)
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wavfile.write( struct.pack('I', 16 ) ) # Length of format data as listed above
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# FMT DATA
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wavfile.write( struct.pack('H', 1 ) ) # Type of format (1 is PCM) - 2 byte integer
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wavfile.write( struct.pack('H', channels ) ) # Number of Channels - 2 byte integer
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wavfile.write( struct.pack('I', sample_rate ) ) # Sample Rate - 32 byte integer. Common values are 44100 (CD), 48000 (DAT). Sample Rate = Number of Samples per second, or Hertz
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wavfile.write( struct.pack('I', int(sample_rate * bits_per_sample * channels / 8) ) ) # (Sample Rate * BitsPerSample * Channels) / 8
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wavfile.write( struct.pack('H', 4 ) ) # 0: (BitsPerSample * Channels) / 8
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# 1: 8 bit mono2
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# 2: 8 bit stereo
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# 3: 16 bit mono
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# 4: 16 bit stereo
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wavfile.write( struct.pack('H', bits_per_sample ) ) # Bits per sample
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# DATA HEADER
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wavfile.write( 'data'.encode() ) # “data” chunk header. Marks the beginning of the data section
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wavfile.write( struct.pack('I', data_size ) ) # Size of the data section
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# // WAV DATA
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wavfile.write( binfile.read() )
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for filename in sys.argv:
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convert_bin_to_audio(filename)
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