From f7ec537cd5847afade80022eba06700cdb7d1505 Mon Sep 17 00:00:00 2001
From: Josip Janzic <josip@jjanzic.com>
Date: Thu, 27 Apr 2017 20:47:53 +0200
Subject: [PATCH] Add support for subtitles on Chromecast

---
 src/renderer/lib/cast.js   | 58 +++++++++++++++++++++++++++++---------
 src/renderer/webtorrent.js |  3 +-
 2 files changed, 46 insertions(+), 15 deletions(-)

diff --git a/src/renderer/lib/cast.js b/src/renderer/lib/cast.js
index 8db83fc71f..ff5f50cc01 100644
--- a/src/renderer/lib/cast.js
+++ b/src/renderer/lib/cast.js
@@ -13,6 +13,8 @@ module.exports = {
   setRate
 }
 
+const http = require('http')
+
 const config = require('../../config')
 const {CastingError} = require('./errors')
 
@@ -130,22 +132,47 @@ function chromecastPlayer () {
     })
   }
 
+  function serveSubtitles (callback) {
+    const subtitles = state.playing.subtitles
+    const selectedSubtitle = subtitles.tracks[subtitles.selectedIndex]
+    if (!selectedSubtitle) {
+      callback()
+    } else {
+      ret.subServer = http.createServer((req, res) => {
+        res.writeHead(200, {
+          'Content-Type': 'text/vtt;charset=utf-8',
+          'Access-Control-Allow-Origin': '*',
+          'Transfer-Encoding': 'chunked'
+        })
+        res.end(Buffer.from(selectedSubtitle.buffer.substr(21), 'base64'))
+      }).listen(0, function () {
+        const port = ret.subServer.address().port
+        const subtitlesUrl = 'http://' + state.server.networkAddress + ':' + port + '/'
+        callback(subtitlesUrl)
+      })
+    }
+  }
+
   function open () {
     const torrentSummary = state.saved.torrents.find((x) => x.infoHash === state.playing.infoHash)
-    ret.device.play(state.server.networkURL + '/' + state.playing.fileIndex, {
-      type: 'video/mp4',
-      title: config.APP_NAME + ' - ' + torrentSummary.name
-    }, function (err) {
-      if (err) {
-        state.playing.location = 'local'
-        state.errors.push({
-          time: new Date().getTime(),
-          message: 'Could not connect to Chromecast. ' + err.message
-        })
-      } else {
-        state.playing.location = 'chromecast'
-      }
-      update()
+    serveSubtitles(function (subtitlesUrl) {
+      ret.device.play(state.server.networkURL + '/' + state.playing.fileIndex, {
+        type: 'video/mp4',
+        title: config.APP_NAME + ' - ' + torrentSummary.name,
+        subtitles: subtitlesUrl ? [subtitlesUrl] : [],
+        autoSubtitles: !!subtitlesUrl
+      }, function (err) {
+        if (err) {
+          state.playing.location = 'local'
+          state.errors.push({
+            time: new Date().getTime(),
+            message: 'Could not connect to Chromecast. ' + err.message
+          })
+        } else {
+          state.playing.location = 'chromecast'
+        }
+        update()
+      })
     })
   }
 
@@ -159,6 +186,9 @@ function chromecastPlayer () {
 
   function stop (callback) {
     ret.device.stop(callback)
+    if (ret.subServer) {
+      ret.subServer.close()
+    }
   }
 
   function status () {
diff --git a/src/renderer/webtorrent.js b/src/renderer/webtorrent.js
index 1cb6abe565..9436bd004d 100644
--- a/src/renderer/webtorrent.js
+++ b/src/renderer/webtorrent.js
@@ -320,7 +320,8 @@ function startServerFromReadyTorrent (torrent, cb) {
     const info = {
       torrentKey: torrent.key,
       localURL: 'http://localhost' + urlSuffix,
-      networkURL: 'http://' + networkAddress() + urlSuffix
+      networkURL: 'http://' + networkAddress() + urlSuffix,
+      networkAddress: networkAddress()
     }
 
     ipc.send('wt-server-running', info)