173 lines
3.8 KiB
Go
173 lines
3.8 KiB
Go
package lrc2srt
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import (
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"bufio"
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"fmt"
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"github.com/Hami-Lemon/lrc2srt/glist"
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"io"
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"os"
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"sort"
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"strconv"
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"strings"
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)
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type SRTMergeMode int
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const (
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SRT_MERGE_MODE_STACK SRTMergeMode = iota
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SRT_MERGE_MODE_UP
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SRT_MERGE_MODE_BOTTOM
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)
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type SRTContent struct {
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//序号，从1开始
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Index int
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//开始时间，单位毫秒
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Start int
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//结束时间，单位毫秒
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End int
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//歌词内容
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Text string
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}
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/**
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1
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00:00:01,111 --> 00:00:10,111
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字幕
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*/
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//返回SRT文件中，一句字幕的字符串表示形式
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func (s *SRTContent) String() string {
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builder := strings.Builder{}
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builder.WriteString(strconv.Itoa(s.Index))
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builder.WriteByte('\n')
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sh, sm, ss, sms := millisecond2Time(s.Start)
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eh, em, es, ems := millisecond2Time(s.End)
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builder.WriteString(fmt.Sprintf("%02d:%02d:%02d,%03d --> %02d:%02d:%02d,%03d\n",
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sh, sm, ss, sms, eh, em, es, ems))
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builder.WriteString(s.Text)
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builder.WriteString("\n\n")
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return builder.String()
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}
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type SRT struct {
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//歌曲名
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Title string
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//歌手名 未指定文件名是，文件名格式为：歌曲名-歌手名.srt
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Artist string
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Content glist.Queue[*SRTContent]
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}
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// LrcToSrt LRC对象转换成SRT对象
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func LrcToSrt(lrc *LRC) *SRT {
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if lrc == nil {
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return nil
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}
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srt := &SRT{
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Title: lrc.Title,
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Artist: lrc.Artist,
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Content: glist.NewLinkedList[*SRTContent](),
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}
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index := 1
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//上一条srt信息
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var prevSRT *SRTContent
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for it := lrc.LrcList.Iterator(); it.Has(); {
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lrcNode := it.Next()
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srtContent := &SRTContent{
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Index: index,
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Start: lrcNode.time,
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Text: lrcNode.content,
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}
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if index != 1 {
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//上一条歌词的结束时间设置为当前歌词的开始时间
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prevSRT.End = srtContent.Start
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}
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srt.Content.PushBack(srtContent)
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index++
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prevSRT = srtContent
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}
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//最后一条歌词
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if prevSRT != nil {
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//结束时间是为其 开始时间+10 秒
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prevSRT.End = prevSRT.Start + 1000
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}
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return srt
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}
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// Merge 将另一个srt信息合并到当前srt中,有三种合并模式
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//1. SRT_MERGE_MODE_STACK: 按照开始时间对两个srt信息进行排序,交错合并
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//2. SRT_MERGE_MODE_UP: 当前srt信息排列在上,另一个排列在下,即 other 追加到后面
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//3. SRT_MERGE_MODE_BOTTOM: 当前srt信息排列在下,另一个排列在上,即 other 添加到前面
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func (s *SRT) Merge(other *SRT, mode SRTMergeMode) {
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switch mode {
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case SRT_MERGE_MODE_STACK:
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s.mergeStack(other)
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case SRT_MERGE_MODE_UP:
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s.mergeUp(other)
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case SRT_MERGE_MODE_BOTTOM:
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s.mergeBottom(other)
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}
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}
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//todo 改进算法,现在的算法太慢了
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func (s *SRT) mergeStack(other *SRT) {
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size := s.Content.Size() + other.Content.Size()
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temp := make([]*SRTContent, size, size)
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index := 0
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for it := s.Content.Iterator(); it.Has(); {
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temp[index] = it.Next()
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index++
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}
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for it := other.Content.Iterator(); it.Has(); {
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temp[index] = it.Next()
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index++
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}
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sort.SliceStable(temp, func(i, j int) bool {
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return temp[i].Start < temp[j].Start
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})
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list := glist.NewLinkedList[*SRTContent]()
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for _, v := range temp {
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list.Append(v)
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}
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s.Content = list
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}
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func (s *SRT) mergeUp(other *SRT) {
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if other.Content.IsNotEmpty() {
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for it := other.Content.Iterator(); it.Has(); {
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s.Content.Append(it.Next())
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}
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}
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}
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func (s *SRT) mergeBottom(other *SRT) {
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oq := other.Content
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if oq.IsNotEmpty() {
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s.Content.PushFront(*(oq.PullBack()))
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}
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}
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// WriteFile 将SRT格式的数据写入指定的文件中
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func (s *SRT) WriteFile(path string) error {
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f, err := os.Create(path)
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if err != nil {
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return err
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}
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err = s.Write(f)
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err = f.Close()
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return err
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}
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// Write 将SRT格式的数据写入dst中
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func (s *SRT) Write(dst io.Writer) error {
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//6KB的缓冲
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bufSize := 1024 * 6
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writer := bufio.NewWriterSize(dst, bufSize)
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for it := s.Content.Iterator(); it.Has(); {
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_, err := writer.WriteString(it.Next().String())
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if err != nil {
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return err
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}
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}
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return writer.Flush()
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}
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