blob: 4ad374a2477e682810b5c6842c83f6efb7646faa
| 1 | #!/usr/bin/env ruby |
| 2 | |
| 3 | require 'open3' |
| 4 | require 'json' |
| 5 | |
| 6 | ffmpeg_bin = 'ffmpeg' |
| 7 | target_il = -24.0 |
| 8 | target_lra = +11.0 |
| 9 | target_tp = -2.0 |
| 10 | samplerate = '48k' |
| 11 | |
| 12 | if ARGF.argv.count != 2 |
| 13 | puts "Usage: #{$PROGRAM_NAME} input.wav output.wav" |
| 14 | exit 1 |
| 15 | end |
| 16 | |
| 17 | ff_cmd = Array.new([ |
| 18 | ffmpeg_bin, |
| 19 | '-hide_banner', |
| 20 | '-i', ARGF.argv[0], |
| 21 | '-af', "loudnorm='I=#{target_il}:LRA=#{target_lra}:tp=#{target_tp}:print_format=json'", |
| 22 | '-f', 'null', |
| 23 | '-']); |
| 24 | |
| 25 | _stdin, _stdout, stderr, wait_thr = Open3.popen3(*ff_cmd) |
| 26 | |
| 27 | if wait_thr.value.success? |
| 28 | stats = JSON.parse(stderr.read.lines[-12, 12].join) |
| 29 | loudnorm_string = 'loudnorm=' |
| 30 | loudnorm_string += 'print_format=summary:' |
| 31 | loudnorm_string += 'linear=true:' |
| 32 | loudnorm_string += "I=#{target_il}:" |
| 33 | loudnorm_string += "LRA=#{target_lra}:" |
| 34 | loudnorm_string += "tp=#{target_tp}:" |
| 35 | loudnorm_string += "measured_I=#{stats['input_i']}:" |
| 36 | loudnorm_string += "measured_LRA=#{stats['input_lra']}:" |
| 37 | loudnorm_string += "measured_tp=#{stats['input_tp']}:" |
| 38 | loudnorm_string += "measured_thresh=#{stats['input_thresh']}:" |
| 39 | loudnorm_string += "offset=#{stats['target_offset']}" |
| 40 | else |
| 41 | puts stderr.read |
| 42 | exit 1 |
| 43 | end |
| 44 | |
| 45 | ff_cmd = Array.new([ |
| 46 | ffmpeg_bin, |
| 47 | '-y', '-hide_banner', |
| 48 | '-i', ARGF.argv[0], |
| 49 | '-af', loudnorm_string, |
| 50 | '-ar', samplerate, |
| 51 | ARGF.argv[1].to_s]); |
| 52 | |
| 53 | _stdin, _stdout, stderr, wait_thr = Open3.popen3(*ff_cmd) |
| 54 | |
| 55 | if wait_thr.value.success? |
| 56 | puts stderr.read.lines[-12, 12].join |
| 57 | exit 0 |
| 58 | else |
| 59 | puts stderr.read |
| 60 | exit 1 |
| 61 | end |
| 62 |