command line tool for adding ID3 chapters to an MP3 file
if an odd-numbered arg is supplied, use it instead of TLEN
see #1
+40
-19
+11
-4
README.md
+11
-4
README.md
···
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mp3chap file.mp3 0 "chapter 1 is great" 123 "chapter 2 is ok" 456 "chapter 3 is boring"
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The first argument is the path to the MP3 file, then pairs of arguments each containing
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a start time in seconds, and the chapter title.
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The first argument is the path to the MP3 file, then pairs of arguments each
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containing a start time in seconds, and the chapter title.
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It is assumed that each chapter ends where the next one begins, and that the
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final chapter ends at the last millisecond of the file (as defined in its
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`TLEN` ID3 frame).
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If the file does not contain a `TLEN` ID3 frame, a final time argument must
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be supplied (in seconds) which will be used as the end time of the final
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chapter.
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It is assumed that each chapter ends where the next one begins, and that the final chapter
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ends at the last millisecond of the file (as defined in its `TLEN` ID3 frame).
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mp3chap file.mp3 0 "chapter 1 is great" 123 "chapter 2 is ok" 456 "chapter 3 is boring" 789
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Changes to the ID3 tag in the MP3 file are written out in-place.
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-15
mp3chap.go
+29
-15
mp3chap.go
···
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chaps := make([]Chapter, 0)
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tocchaps := make([]string, 0)
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finalEnd := uint64(0)
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for x := 2; x < len(os.Args)-1; x += 2 {
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x := 2
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for ; x < len(os.Args)-1; x += 2 {
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if x+1 > len(os.Args)-2+1 {
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usage()
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}
···
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chaps = append(chaps, chap)
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}
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// if there is a final odd arg, use it as the final chapter end
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if x < len(os.Args) {
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finalEnd, err = strconv.ParseUint(os.Args[x], 10, 32)
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if err != nil {
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log.Fatal("failed parsing final seconds %#v: %v", os.Args[x], err)
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}
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}
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// each chapter ends where the next one starts
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for x := range chaps {
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if x < len(chaps)-1 {
···
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}
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}
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// and the last one ends when the file does
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tlenf := mp3.Frame("TLEN")
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if tlenf == nil {
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log.Fatal("can't find TLEN frame, don't know total duration")
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}
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tlenft, ok := tlenf.(*id3v2.TextFrame)
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if !ok {
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log.Fatal("can't convert TLEN to TextFrame")
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}
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tlen, err := strconv.ParseUint(tlenft.Text(), 10, 32)
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if err == nil {
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log.Fatal("can't parse TLEN value %#v\n", tlenft.Text())
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}
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if finalEnd == 0 {
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// and the last one ends when the file does
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tlenf := mp3.Frame("TLEN")
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if tlenf == nil {
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log.Fatal("can't find TLEN frame, don't know total duration")
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}
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tlenft, ok := tlenf.(*id3v2.TextFrame)
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if !ok {
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log.Fatal("can't convert TLEN to TextFrame")
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}
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tlen, err := strconv.ParseUint(tlenft.Text(), 10, 32)
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if err == nil {
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log.Fatal("can't parse TLEN value %#v\n", tlenft.Text())
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}
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chaps[len(chaps)-1].endSecs = uint32(tlen)
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chaps[len(chaps)-1].endSecs = uint32(tlen)
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} else {
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chaps[len(chaps)-1].endSecs = uint32(finalEnd)
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}
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// ready to modify the file, clear out what's there
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mp3.DeleteFrames("CTOC")