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package m3u8
import (
"fmt"
"strings"
)
// Write writes a playlist to a string
func Write(pl *Playlist) (string, error) {
var sb strings.Builder
if !pl.IsValid() {
return "", ErrPlaylistInvalidType
}
writeHeader(&sb, pl)
for _, item := range pl.Items {
sb.WriteString(item.String())
sb.WriteRune('\n')
}
writeFooter(&sb, pl)
return sb.String(), nil
}
func writeHeader(sb *strings.Builder, pl *Playlist) {
sb.WriteString(HeaderTag)
sb.WriteRune('\n')
if pl.IsMaster() {
writeVersionTag(sb, pl.Version)
writeIndependentSegmentsTag(sb, pl.IndependentSegments)
} else {
if pl.Type != nil {
sb.WriteString(fmt.Sprintf("%s:%s", PlaylistTypeTag, *pl.Type))
sb.WriteRune('\n')
}
writeVersionTag(sb, pl.Version)
writeIndependentSegmentsTag(sb, pl.IndependentSegments)
if pl.IFramesOnly {
sb.WriteString(IFramesOnlyTag)
sb.WriteRune('\n')
}
sb.WriteString(fmt.Sprintf("%s:%v", MediaSequenceTag, pl.Sequence))
sb.WriteRune('\n')
writeDiscontinuitySequenceTag(sb, pl.DiscontinuitySequence)
writeCacheTag(sb, pl.Cache)
sb.WriteString(fmt.Sprintf("%s:%v", TargetDurationTag, pl.Target))
sb.WriteRune('\n')
}
}
func writeFooter(sb *strings.Builder, pl *Playlist) {
if pl.IsLive() || pl.IsMaster() {
return
}
sb.WriteString(FooterTag)
sb.WriteRune('\n')
}
func writeVersionTag(sb *strings.Builder, version *int) {
if version == nil {
return
}
sb.WriteString(fmt.Sprintf("%s:%v", VersionTag, *version))
sb.WriteRune('\n')
}
func writeIndependentSegmentsTag(sb *strings.Builder, toWrite bool) {
if !toWrite {
return
}
sb.WriteString(IndependentSegmentsTag)
sb.WriteRune('\n')
}
func writeDiscontinuitySequenceTag(sb *strings.Builder, sequence *int) {
if sequence == nil {
return
}
sb.WriteString(fmt.Sprintf("%s:%v", DiscontinuitySequenceTag, *sequence))
sb.WriteRune('\n')
}
func writeCacheTag(sb *strings.Builder, cache *bool) {
if cache == nil {
return
}
sb.WriteString(fmt.Sprintf("%s:%s", CacheTag, formatYesNo(*cache)))
sb.WriteRune('\n')
}
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