オーディオCDからトラック数を読みますか？

妄想

コマンドラインツールを使用してCDトラックのリストを取得できますcdparanoia。

$ cdparanoia -sQ

はい

$ cdparanoia -sQ
cdparanoia III release 10.2 (September 11, 2008)


Table of contents (audio tracks only):
track        length               begin        copy pre ch
===========================================================
  1.    19497 [04:19.72]        0 [00:00.00]    OK   no  2
  2.    20253 [04:30.03]    19497 [04:19.72]    OK   no  2
  3.    29250 [06:30.00]    39750 [08:50.00]    OK   no  2
  4.    34263 [07:36.63]    69000 [15:20.00]    OK   no  2
  5.    28804 [06:24.04]   103263 [22:56.63]    OK   no  2
  6.    21582 [04:47.57]   132067 [29:20.67]    OK   no  2
  7.    33270 [07:23.45]   153649 [34:08.49]    OK   no  2
  8.    29919 [06:38.69]   186919 [41:32.19]    OK   no  2
  9.    29564 [06:34.14]   216838 [48:11.13]    OK   no  2
 10.    18993 [04:13.18]   246402 [54:45.27]    OK   no  2
 11.    35368 [07:51.43]   265395 [58:58.45]    OK   no  2
TOTAL  300763 [66:50.13]    (audio only)

「OK」という文字列を含めるか、数字で始まる行数を計算できます（例：）1.。

$ cdparanoia -sQ |& grep OK | wc -l
11

-or-

$ cdparanoia -sQ |& grep -P "^\s+\d+\." | wc -l
11

CDDA2WAV

このコマンドラインツールを使用することもできますcdda2wav。

$ cdda2wav -J -D /dev/cdrom

はい

$ cdda2wav -J -D /dev/cdrom
Type: ROM, Vendor 'Optiarc ' Model 'DVD RW AD-7930H ' Revision '1.D1' MMC+CDDA
569344 bytes buffer memory requested, 4 buffers, 55 sectors
#icedax version 1.1.11, real time sched., soundcard, libparanoia support
AUDIOtrack pre-emphasis  copy-permitted tracktype channels
      1-11           no             yes     audio    2
Table of Contents: total tracks:11, (total time 66:50.13)
  1.( 4:19.72),  2.( 4:30.03),  3.( 6:30.00),  4.( 7:36.63),  5.( 6:24.04),
  6.( 4:47.57),  7.( 7:23.45),  8.( 6:38.69),  9.( 6:34.14), 10.( 4:13.18),
 11.( 7:51.43)

Table of Contents: starting sectors
  1.(       0),  2.(   19497),  3.(   39750),  4.(   69000),  5.(  103263),
  6.(  132067),  7.(  153649),  8.(  186919),  9.(  216838), 10.(  246402),
 11.(  265395), lead-out(  300763)
CDINDEX discid: gteZIAUq3lgZlEmNg_HnbWL6cJc-
CDDB discid: 0x950faa0b
CD-Text: detected
CD-Extra: not detected
Album title: 'Hour of the Olympics' [from Mary Pope Osborne]
Track  1: 'Viking Ships at Sunrise Ch 3'
Track  2: 'Viking Ships at Sunrise Ch 4'
Track  3: 'Viking Ships at Sunrise Ch 5-6'
Track  4: 'Viking Ships at Sunrise Ch 7-8'
Track  5: 'Viking Ships at Sunrise Ch 9-10'
Track  6: 'Hour of the Olympics Ch 1'
Track  7: 'Hour of the Olympics Ch 2-3'
Track  8: 'Hour of the Olympics Ch 4-5'
Track  9: 'Hour of the Olympics Ch 6-8'
Track 10: 'Hour of the Olympics Ch 9'
Track 11: 'Hour of the Olympics Ch 10'
No media catalog number present.
scanning for ISRCs: 11 ...
index scan: 11...

grepもう一度トラック数を確認するために助けを求めることができます。

# traditional way to parse output
$ cdda2wav -J -D /dev/cdrom |& grep index | sed 's#.*: \(.*\)...#\1#g'
11

# use grep's PCRE capability
$ cdda2wav -J -D /dev/cdrom |& grep -Po '(?<=index scan: )\d+' | tail -1
11

引用する

• 方法：LinuxでオーディオCDを抽出してエンコードする