#!ruby -Ks
# -*- mode: ruby; encoding: sjis -*-
# Last updated: <2015/05/16 23:28:19 +0900>
#
# Rubyでwavファイルを処理する例
# wavefile を使う事例

require "rubygems"
require "wavefile"

IN_FILE = "input.wav"

# wavファイルの情報を表示してみる

info = WaveFile::Reader.info(IN_FILE)
puts "Audio Format:        #{info.audio_format}"
puts "Channels:            #{info.channels}"
puts "Bits per sample:     #{info.bits_per_sample}"
puts "Samples per second:  #{info.sample_rate}"
puts "Bytes per second:    #{info.byte_rate}"
puts "Block align:         #{info.block_align}"
puts "Sample frame count:  #{info.sample_frame_count}"

# wavの時間を表示

duration = info.duration
formatted_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")
puts "Play time:           #{formatted_duration}"