Add additional video player keyboard shortcuts (#275)

*  Skip forward 10 seconds ((CMD OR CTRL) ALT right)
 Skip back 10 seconds ((CMD OR CTRL) ALT left)
 Increase video speed ((CMD OR CTRL) +)
 Decrease video speed ((CMD OR CTRL) -)

* Codestyle fix

* The 'steps' should be implemented in base2, standard players use 1x, 2x, 4x, 8x, 16x

fixed bug with shift + "=" which is "+"

* resolve conflicts

* remove ide specific data
make playback rate more granular
add to menu skip and speed entries

* intendation fix

* conflict resolve

* rename setPlaybackRate to changePlaybackRate
setRate return boolean depending on whether this cast target supports setting the playback rate.
if setRate returns false - don`t change state
redundant else if statement in changePlaybackRate function

main/menu.js

@@ -92,6 +92,30 @@ function openSubtitles () {
   }
 }
 
+function skipForward () {
+  if (windows.main) {
+    windows.main.send('dispatch', 'skip', 1)
+  }
+}
+
+function skipBack () {
+  if (windows.main) {
+    windows.main.send('dispatch', 'skip', -1)
+  }
+}
+
+function increasePlaybackRate () {
+  if (windows.main) {
+    windows.main.send('dispatch', 'changePlaybackRate', 1)
+  }
+}
+
+function decreasePlaybackRate () {
+  if (windows.main) {
+    windows.main.send('dispatch', 'changePlaybackRate', -1)
+  }
+}
+
 function onWindowShow () {
   log('onWindowShow')
   getMenuItem('Full Screen').enabled = true
@@ -110,6 +134,10 @@ function onPlayerOpen () {
   getMenuItem('Increase Volume').enabled = true
   getMenuItem('Decrease Volume').enabled = true
   getMenuItem('Add Subtitles File...').enabled = true
+  getMenuItem('Skip forward 10 seconds').enabled = true
+  getMenuItem('Skip back 10 seconds').enabled = true
+  getMenuItem('Increase video speed').enabled = true
+  getMenuItem('Decrease video speed').enabled = true
 }
 
 function onPlayerClose () {
@@ -118,6 +146,10 @@ function onPlayerClose () {
   getMenuItem('Increase Volume').enabled = false
   getMenuItem('Decrease Volume').enabled = false
   getMenuItem('Add Subtitles File...').enabled = false
+  getMenuItem('Skip forward 10 seconds').enabled = false
+  getMenuItem('Skip back 10 seconds').enabled = false
+  getMenuItem('Increase video speed').enabled = false
+  getMenuItem('Decrease video speed').enabled = false
 }
 
 function onToggleFullScreen (isFullScreen) {
@@ -311,6 +343,36 @@ function getAppMenuTemplate () {
           label: 'Add Subtitles File...',
           click: openSubtitles,
           enabled: false
+        },
+        {
+          type: 'separator'
+        },
+        {
+          label: 'Skip forward 10 seconds',
+          accelerator: 'CmdOrCtrl+Alt+Right',
+          click: skipForward,
+          enabled: false
+        },
+        {
+          label: 'Skip back 10 seconds',
+          accelerator: 'CmdOrCtrl+Alt+Left',
+          click: skipBack,
+          enabled: false
+        },
+        {
+          type: 'separator'
+        },
+        {
+          label: 'Increase video speed',
+          accelerator: 'CmdOrCtrl+plus',
+          click: increasePlaybackRate,
+          enabled: false
+        },
+        {
+          label: 'Decrease video speed',
+          accelerator: 'CmdOrCtrl+-',
+          click: decreasePlaybackRate,
+          enabled: false
         }
       ]
     },

renderer/index.css

@@ -748,6 +748,13 @@ body.drag .app::after {
   padding: 5px;
   margin: 0 auto;
 }
+.player-controls .rate {
+  display: inline;
+  height: 30px;
+  padding: 5px;
+  margin-left: 20px;
+  float: left;
+}
 
 .player-controls .device,
 .player-controls .fullscreen,

renderer/index.js

@@ -285,6 +285,12 @@ function dispatch (action, ...args) {
   if (action === 'playbackJump') {
     jumpToTime(args[0] /* seconds */)
   }
+  if (action === 'skip') {
+    jumpToTime(state.playing.currentTime + (args[0] /* direction */ * 10))
+  }
+  if (action === 'changePlaybackRate') {
+    changePlaybackRate(args[0] /* direction */)
+  }
   if (action === 'changeVolume') {
     changeVolume(args[0] /* increase */)
   }
@@ -399,7 +405,26 @@ function jumpToTime (time) {
     state.playing.jumpToTime = time
   }
 }
-
+function changePlaybackRate (direction) {
+  var rate = state.playing.playbackRate
+  if (direction > 0 && rate >= 0.25 && rate < 2) {
+    rate += 0.25
+  } else if (direction < 0 && rate > 0.25 && rate <= 2) {
+    rate -= 0.25
+  } else if (direction < 0 && rate === 0.25) { /* when we set playback rate at 0 in html 5, playback hangs ;( */
+    rate = -1
+  } else if (direction > 0 && rate === -1) {
+    rate = 0.25
+  } else if ((direction > 0 && rate >= 1 && rate < 16) || (direction < 0 && rate > -16 && rate <= -1)) {
+    rate *= 2
+  } else if ((direction < 0 && rate > 1 && rate <= 16) || (direction > 0 && rate >= -16 && rate < -1)) {
+    rate /= 2
+  }
+  state.playing.playbackRate = rate
+  if (lazyLoadCast().isCasting() && !Cast.setRate(rate)) {
+    state.playing.playbackRate = 1
+  }
+}
 function changeVolume (delta) {
   // change volume with delta value
   setVolume(state.playing.volume + delta)

renderer/lib/cast.js

@@ -8,7 +8,8 @@ module.exports = {
   play,
   pause,
   seek,
-  setVolume
+  setVolume,
+  setRate
 }
 
 var airplay = require('airplay-js')
@@ -344,6 +345,22 @@ function pause () {
   }
 }
 
+function setRate (rate) {
+  var device
+  var result = true
+  if (state.playing.location === 'chromecast') {
+    // TODO find how to control playback rate on chromecast
+    castCallback()
+    result = false
+  } else if (state.playing.location === 'airplay') {
+    device = state.devices.airplay
+    device.rate(rate, castCallback)
+  } else {
+    result = false
+  }
+  return result
+}
+
 function seek (time) {
   var device = getDevice()
   if (device) {

renderer/state.js

@@ -80,6 +80,7 @@ function getDefaultPlayState () {
     isStalled: false,
     lastTimeUpdate: 0, /* Unix time in ms */
     mouseStationarySince: 0, /* Unix time in ms */
+    playbackRate: 1,
     subtitles: {
       tracks: [], /* subtitle tracks, each {label, language, ...} */
       selectedIndex: -1, /* current subtitle track */

renderer/views/app.js

@@ -26,7 +26,8 @@ function App (state) {
     state.playing.mouseStationarySince !== 0 &&
     new Date().getTime() - state.playing.mouseStationarySince > 2000 &&
     !state.playing.isPaused &&
-    state.playing.location === 'local'
+    state.playing.location === 'local' &&
+    state.playing.playbackRate === 1
 
   // Hide the header on Windows/Linux when in the player
   // On OSX, the header appears as part of the title bar

renderer/views/player.js

@@ -48,6 +48,9 @@ function renderMedia (state) {
       mediaElement.currentTime = state.playing.jumpToTime
       state.playing.jumpToTime = null
     }
+    if (state.playing.playbackRate !== mediaElement.playbackRate) {
+      mediaElement.playbackRate = state.playing.playbackRate
+    }
     // Set volume
     if (state.playing.setVolume !== null && isFinite(state.playing.setVolume)) {
       mediaElement.volume = state.playing.setVolume
@@ -440,6 +443,12 @@ function renderPlayerControls (state) {
     </span>
   `)
 
+  // render playback rate
+  if (state.playing.playbackRate !== 1) {
+    elements.push(hx`
+     <span class="rate">speed: ${state.playing.playbackRate}X</span>
+    `)
+  }
   // Finally, the big button in the center plays or pauses the video
   elements.push(hx`
     <i class='icon play-pause' onclick=${dispatcher('playPause')}>