sample_encoder.rb

#!/usr/bin/ruby

require'wavefile'

classSampleEncoder
attr_accessor:filename

definitialize(params)
self.filename=params[0]
end

defusage
puts<<-EOS

 Usage:

#{$0} <filename>

 Where <filename> is a path to a valid WAV format file

 EOS
end

defgenerate!
ifreader
print_encoded_structure
else
usage
end
rescue=>e
loge.message
usage
end

defreader
@reader ||= WaveFile::Reader.new(filename)
end

deftarget_format
@target_format ||= WaveFile::Format.new(:mono,:pcm_8,8000)
end

defplaying_time(duration)
duration.hours.to_s.rjust(2,"0") << ":" <<
duration.minutes.to_s.rjust(2,"0") << ":" <<
duration.seconds.to_s.rjust(2,"0") << "." <<
duration.milliseconds.to_s.rjust(3,"0")
end

defprint_header
puts<<-EOS
#pragma once

/*
 SAMPLE DATA
 generated by : sample_generator.rb
 Source file : #{filename}
 Format : #{reader.native_format.audio_format}
 Channels : #{reader.native_format.channels}
 Bits/sample : #{reader.native_format.bits_per_sample}
 Sample rate : #{reader.native_format.sample_rate}
 Byte rate : #{reader.native_format.byte_rate}
 Frame count : #{reader.total_sample_frames}
 Playing time : #{playing_time(reader.total_duration)}
*/
 EOS
end

defprint_encoded_structure
print_header
print_samples
end

defprint_samples
puts"const unsigned char sample[] PROGMEM = {"
reader.each_bufferdo |buffer|
converted_buffer=buffer.convert(target_format)
converted_buffer.samples.eachdo |value|
puts" #{sprintf("0x%X",value)}, // #{value}"
end
end
puts"};"
end

deflog(message)
STDERR.putsmessage
end

end

SampleEncoder.new(ARGV).generate!