Add Captions in playerResponseData (#293)

Author: Shinku-Chen

client_test.go

@@ -92,6 +92,10 @@ func TestGetVideoWithoutManifestURL(t *testing.T) {
 	assert.Empty(video.HLSManifestURL)
 	assert.Empty(video.DASHManifestURL)
 
+	assert.NotEmpty(video.CaptionTracks)
+	assert.Greater(len(video.CaptionTracks), 0)
+	assert.NotEmpty(video.CaptionTracks[0].BaseURL)
+
 	assert.Equal("rFejpH_tAHM", video.ID)
 	assert.Equal("dotGo 2015 - Rob Pike - Simplicity is Complicated", video.Title)
 	assert.Equal("dotconferences", video.Author)

response_data.go

@@ -1,6 +1,22 @@
 package youtube
 
 type playerResponseData struct {
+	Captions struct {
+		PlayerCaptionsTracklistRenderer struct {
+			CaptionTracks []CaptionTrack `json:"captionTracks"`
+			AudioTracks   []struct {
+				CaptionTrackIndices []int `json:"captionTrackIndices"`
+			} `json:"audioTracks"`
+			TranslationLanguages []struct {
+				LanguageCode string `json:"languageCode"`
+				LanguageName struct {
+					SimpleText string `json:"simpleText"`
+				} `json:"languageName"`
+			} `json:"translationLanguages"`
+			DefaultAudioTrackIndex int `json:"defaultAudioTrackIndex"`
+		} `json:"playerCaptionsTracklistRenderer"`
+	} `json:"captions"`
+
 	PlayabilityStatus struct {
 		Status          string `json:"status"`
 		Reason          string `json:"reason"`
@@ -110,3 +126,14 @@ type Thumbnail struct {
 	Width  uint
 	Height uint
 }
+
+type CaptionTrack struct {
+	BaseURL string `json:"baseUrl"`
+	Name    struct {
+		SimpleText string `json:"simpleText"`
+	} `json:"name"`
+	VssID          string `json:"vssId"`
+	LanguageCode   string `json:"languageCode"`
+	Kind           string `json:"kind,omitempty"`
+	IsTranslatable bool   `json:"isTranslatable"`
+}

video.go

@@ -24,6 +24,7 @@ type Video struct {
 	Thumbnails      Thumbnails
 	DASHManifestURL string // URI of the DASH manifest file
 	HLSManifestURL  string // URI of the HLS manifest file
+	CaptionTracks   []CaptionTrack
 }
 
 const dateFormat = "2006-01-02"
@@ -98,6 +99,7 @@ func (v *Video) extractDataFromPlayerResponse(prData playerResponseData) error {
 	v.Author = prData.VideoDetails.Author
 	v.Thumbnails = prData.VideoDetails.Thumbnail.Thumbnails
 	v.ChannelID = prData.VideoDetails.ChannelID
+	v.CaptionTracks = prData.Captions.PlayerCaptionsTracklistRenderer.CaptionTracks
 
 	if views, _ := strconv.Atoi(prData.VideoDetails.ViewCount); views > 0 {
 		v.Views = views