From e76eabfd62919b48caa6a3825f89e3e56c4525af Mon Sep 17 00:00:00 2001
From: Kubo Ryosuke <sunfish-shogi@users.noreply.github.com>
Date: Wed, 18 Dec 2024 12:08:13 +0900
Subject: [PATCH] Add Media Playlist methods

---
 master_playlist_tags.go     |  8 ++++----
 media_playlist_tags.go      | 31 +++++++++++++++++++++++++++++++
 media_playlist_tags_test.go | 17 +++++++++++++++++
 3 files changed, 52 insertions(+), 4 deletions(-)

diff --git a/master_playlist_tags.go b/master_playlist_tags.go
index acf024a..02cf867 100644
--- a/master_playlist_tags.go
+++ b/master_playlist_tags.go
@@ -10,10 +10,10 @@ import (
 type MediaType string
 
 const (
-	MediaTypeAudio          = "AUDIO"
-	MediaTypeVideo          = "VIDEO"
-	MediaTypeSubtitles      = "SUBTITLES"
-	MediaTypeClosedCaptions = "CLOSED-CAPTIONS"
+	MediaTypeAudio          MediaType = "AUDIO"
+	MediaTypeVideo          MediaType = "VIDEO"
+	MediaTypeSubtitles      MediaType = "SUBTITLES"
+	MediaTypeClosedCaptions MediaType = "CLOSED-CAPTIONS"
 )
 
 // StreamInfAttrs represents the attributes of the EXT-X-STREAM-INF tag.
diff --git a/media_playlist_tags.go b/media_playlist_tags.go
index dbd57dc..1c041bd 100644
--- a/media_playlist_tags.go
+++ b/media_playlist_tags.go
@@ -8,6 +8,13 @@ import (
 	"time"
 )
 
+type MediaPlaylistType string
+
+const (
+	MediaPlaylistTypeEvent MediaPlaylistType = "EVENT"
+	MediaPlaylistTypeVOD   MediaPlaylistType = "VOD"
+)
+
 // MediaPlaylistTags represents the tags of a media playlist.
 type MediaPlaylistTags Tags
 
@@ -57,6 +64,30 @@ func (tags MediaPlaylistTags) TargetDuration() int {
 	return duration
 }
 
+// SetTargetDuration sets the value of the EXT-X-TARGETDURATION tag.
+func (tags MediaPlaylistTags) SetTargetDuration(duration int) {
+	tags[TagExtXTargetDuration] = []string{strconv.Itoa(duration)}
+}
+
+// PlaylistType returns the value of the EXT-X-PLAYLIST-TYPE tag.
+func (tags MediaPlaylistTags) PlaylistType() MediaPlaylistType {
+	values, ok := tags[TagExtXPlaylistType]
+	if !ok || len(values) == 0 {
+		return ""
+	}
+	return MediaPlaylistType(values[0])
+}
+
+// SetPlaylistType sets the value of the EXT-X-PLAYLIST-TYPE tag.
+func (tags MediaPlaylistTags) SetPlaylistType(playlistType MediaPlaylistType) {
+	tags[TagExtXPlaylistType] = []string{string(playlistType)}
+}
+
+// RemovePlaylistType removes the EXT-X-PLAYLIST-TYPE tag.
+func (tags MediaPlaylistTags) RemovePlaylistType() {
+	delete(tags, TagExtXPlaylistType)
+}
+
 // MediaSequence returns the value of the EXT-X-MEDIA-SEQUENCE tag.
 func (tags MediaPlaylistTags) MediaSequence() int64 {
 	values, ok := tags[TagExtXMediaSequence]
diff --git a/media_playlist_tags_test.go b/media_playlist_tags_test.go
index 0b8eb0c..ff16ecb 100644
--- a/media_playlist_tags_test.go
+++ b/media_playlist_tags_test.go
@@ -13,19 +13,36 @@ func TestMediaPlaylistTags(t *testing.T) {
 		tags := MediaPlaylistTags{
 			"EXT-X-VERSION":                []string{"4"},
 			"EXT-X-TARGETDURATION":         []string{"12"},
+			"EXT-X-PLAYLIST-TYPE":          []string{"VOD"},
 			"EXT-X-MEDIA-SEQUENCE":         []string{"12345"},
 			"EXT-X-DISCONTINUITY-SEQUENCE": []string{"123"},
 		}
 		assert.Equal(t, int(4), tags.Version())
 		assert.Equal(t, 12, tags.TargetDuration())
+		assert.Equal(t, MediaPlaylistTypeVOD, tags.PlaylistType())
 		assert.Equal(t, int64(12345), tags.MediaSequence())
 		assert.Equal(t, int64(123), tags.DiscontinuitySequence())
 	})
 
 	t.Run("setters", func(t *testing.T) {
 		tags := make(MediaPlaylistTags)
+		tags.SetPlaylistType(MediaPlaylistTypeEvent)
 		tags.SetMediaSequence(12345)
 		tags.SetDiscontinuitySequence(123)
+		assert.Equal(t, MediaPlaylistTags{
+			"EXT-X-PLAYLIST-TYPE":          []string{"EVENT"},
+			"EXT-X-MEDIA-SEQUENCE":         []string{"12345"},
+			"EXT-X-DISCONTINUITY-SEQUENCE": []string{"123"},
+		}, tags)
+	})
+
+	t.Run("removers", func(t *testing.T) {
+		tags := MediaPlaylistTags{
+			"EXT-X-PLAYLIST-TYPE":          []string{"EVENT"},
+			"EXT-X-MEDIA-SEQUENCE":         []string{"12345"},
+			"EXT-X-DISCONTINUITY-SEQUENCE": []string{"123"},
+		}
+		tags.RemovePlaylistType()
 		assert.Equal(t, MediaPlaylistTags{
 			"EXT-X-MEDIA-SEQUENCE":         []string{"12345"},
 			"EXT-X-DISCONTINUITY-SEQUENCE": []string{"123"},