kopia lustrzana https://github.com/jcs/mp3chap
initial version
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//
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// id3chap
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// Copyright (c) 2017 joshua stein <jcs@jcs.org>
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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//
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// 1. Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// 3. The name of the author may not be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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// OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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// IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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// NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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// THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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package main
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import (
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"fmt"
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id3 "github.com/jcs/id3-go"
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id3v2 "github.com/jcs/id3-go/v2"
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"os"
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"strconv"
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)
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type Chapter struct {
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element string
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startSecs uint32
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endSecs uint32
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title string
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}
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func usage() {
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fmt.Printf("%s: <mp3 file> [<start seconds> <chapter label> ...]\n", os.Args[0])
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os.Exit(1)
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}
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func main() {
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if len(os.Args) < 4 {
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usage()
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}
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fn := os.Args[1]
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mp3, err := id3.Open(fn)
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if err != nil {
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fmt.Errorf("can't open %s: %s", fn, err)
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}
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chaps := make([]Chapter, 0)
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tocchaps := make([]string, 0)
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for x := 2; 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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startSecs, err := strconv.ParseUint(os.Args[x], 10, 32)
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if err != nil {
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fmt.Errorf("failed parsing seconds %#v: %v", os.Args[x], err)
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}
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element := fmt.Sprintf("chp%d", len(chaps))
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tocchaps = append(tocchaps, element)
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chap := Chapter{element, uint32(startSecs * 1000), 0, os.Args[x+1]}
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chaps = append(chaps, chap)
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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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chaps[x].endSecs = chaps[x+1].startSecs
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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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fmt.Errorf("can't find TLEN frame, don't know total duration")
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}
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tlenft := tlenf.(*id3v2.TextFrame)
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tlen, err := strconv.ParseUint(tlenft.Text(), 10, 32)
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if err == nil {
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fmt.Errorf("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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// ready to modify the file, clear out what's there
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mp3.DeleteFrames("CTOC")
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mp3.DeleteFrames("CHAP")
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// add each chapter
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chapft := id3v2.V23FrameTypeMap["CHAP"]
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for _, c := range chaps {
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ch := id3v2.NewChapterFrame(chapft, c.element, c.startSecs, c.endSecs, 0, 0, true, c.title, "", "")
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mp3.AddFrames(ch)
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}
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// build a new TOC referencing each chapter
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ctocft := id3v2.V23FrameTypeMap["CTOC"]
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toc := id3v2.NewTOCFrame(ctocft, "toc", true, true, tocchaps)
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mp3.AddFrames(toc)
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mp3.Close()
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}
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