Add:Chromecast support in experimental #367, Change:Audio player model for direct play

client/players/castUtils.js

@@ -0,0 +1,74 @@
+
+function getMediaInfoFromTrack(audiobook, castImage, track) {
+  // https://developers.google.com/cast/docs/reference/web_sender/chrome.cast.media.AudiobookChapterMediaMetadata
+  var metadata = new chrome.cast.media.AudiobookChapterMediaMetadata()
+  metadata.bookTitle = audiobook.book.title
+  metadata.chapterNumber = track.index
+  metadata.chapterTitle = track.title
+  metadata.images = [castImage]
+  metadata.title = track.title
+  metadata.subtitle = audiobook.book.title
+
+  var trackurl = track.fullContentUrl
+  var mimeType = track.mimeType
+  var mediainfo = new chrome.cast.media.MediaInfo(trackurl, mimeType)
+  mediainfo.metadata = metadata
+  mediainfo.itemId = track.index
+  mediainfo.duration = track.duration
+  return mediainfo
+}
+
+function buildCastMediaInfo(audiobook, coverUrl, tracks) {
+  const castImage = new chrome.cast.Image(coverUrl)
+  return tracks.map(t => getMediaInfoFromTrack(audiobook, castImage, t))
+}
+
+function buildCastQueueRequest(audiobook, coverUrl, tracks, startTime) {
+  var mediaInfoItems = buildCastMediaInfo(audiobook, coverUrl, tracks)
+
+  var containerMetadata = new chrome.cast.media.AudiobookContainerMetadata()
+  containerMetadata.authors = [audiobook.book.authorFL]
+  containerMetadata.narrators = [audiobook.book.narratorFL]
+  containerMetadata.publisher = audiobook.book.publisher || undefined
+
+  var mediaQueueItems = mediaInfoItems.map((mi) => {
+    var queueItem = new chrome.cast.media.QueueItem(mi)
+    return queueItem
+  })
+
+  // Find track to start playback and calculate track start offset
+  var track = tracks.find(at => at.startOffset <= startTime && at.startOffset + at.duration > startTime)
+  var trackStartIndex = track ? track.index - 1 : 0
+  var trackStartTime = Math.floor(track ? startTime - track.startOffset : 0)
+
+  var queueData = new chrome.cast.media.QueueData(audiobook.id, audiobook.book.title, '', false, mediaQueueItems, trackStartIndex, trackStartTime)
+  queueData.containerMetadata = containerMetadata
+  queueData.queueType = chrome.cast.media.QueueType.AUDIOBOOK
+  return queueData
+}
+
+function castLoadMedia(castSession, request) {
+  return new Promise((resolve) => {
+    castSession.loadMedia(request)
+      .then(() => resolve(true), (reason) => {
+        console.error('Load media failed', reason)
+        resolve(false)
+      })
+  })
+}
+
+function buildCastLoadRequest(audiobook, coverUrl, tracks, startTime, autoplay, playbackRate) {
+  var request = new chrome.cast.media.LoadRequest()
+
+  request.queueData = buildCastQueueRequest(audiobook, coverUrl, tracks, startTime)
+  request.currentTime = request.queueData.startTime
+
+  request.autoplay = autoplay
+  request.playbackRate = playbackRate
+  return request
+}
+
+export {
+  buildCastLoadRequest,
+  castLoadMedia
+}