From 61abce93869af56c788cc3a18f6e251c232f0b77 Mon Sep 17 00:00:00 2001
From: Jelle van Snik <jellevs@gmail.com>
Date: Sun, 8 Jan 2023 17:51:38 +0100
Subject: [PATCH] buffering

---
 src/components/video/VideoPlayer.tsx          |  2 +-
 .../video/controls/PauseControl.tsx           |  2 +-
 .../video/controls/ProgressControl.tsx        | 47 +++++++++++
 .../video/controls/VolumeControl.tsx          | 34 ++++++++
 src/components/video/hooks/controlVideo.ts    | 18 +++++
 src/components/video/hooks/useVideoPlayer.ts  | 80 ++++++++++++++++---
 src/components/video/hooks/utils.ts           |  8 ++
 src/views/TestView.tsx                        | 19 ++++-
 8 files changed, 197 insertions(+), 13 deletions(-)
 create mode 100644 src/components/video/controls/ProgressControl.tsx
 create mode 100644 src/components/video/controls/VolumeControl.tsx
 create mode 100644 src/components/video/hooks/utils.ts

diff --git a/src/components/video/VideoPlayer.tsx b/src/components/video/VideoPlayer.tsx
index 1dddbb1f..c442f6e5 100644
--- a/src/components/video/VideoPlayer.tsx
+++ b/src/components/video/VideoPlayer.tsx
@@ -9,7 +9,7 @@ const VideoPlayerInternals = forwardRef<HTMLVideoElement>((_, ref) => {
   const video = useContext(VideoPlayerContext);
 
   return (
-    <video ref={ref} className="h-full w-full">
+    <video ref={ref} preload="auto" playsInline className="h-full w-full">
       {video.source ? <source src={video.source} type="video/mp4" /> : null}
     </video>
   );
diff --git a/src/components/video/controls/PauseControl.tsx b/src/components/video/controls/PauseControl.tsx
index 3f19100d..5b2c4466 100644
--- a/src/components/video/controls/PauseControl.tsx
+++ b/src/components/video/controls/PauseControl.tsx
@@ -9,7 +9,7 @@ export function PauseControl() {
     else videoState.play();
   }, [videoState]);
 
-  let text =
+  const text =
     videoState.isPlaying || videoState.isSeeking ? "playing" : "paused";
 
   return (
diff --git a/src/components/video/controls/ProgressControl.tsx b/src/components/video/controls/ProgressControl.tsx
new file mode 100644
index 00000000..98c0ee16
--- /dev/null
+++ b/src/components/video/controls/ProgressControl.tsx
@@ -0,0 +1,47 @@
+import { useCallback, useRef } from "react";
+import { useVideoPlayerState } from "../VideoContext";
+
+export function ProgressControl() {
+  const { videoState } = useVideoPlayerState();
+  const ref = useRef<HTMLDivElement>(null);
+
+  const watchProgress = `${(
+    (videoState.time / videoState.duration) *
+    100
+  ).toFixed(2)}%`;
+  const bufferProgress = `${(
+    (videoState.buffered / videoState.duration) *
+    100
+  ).toFixed(2)}%`;
+
+  const handleClick = useCallback(
+    (e: React.MouseEvent<HTMLElement>) => {
+      if (!ref.current) return;
+      const rect = ref.current.getBoundingClientRect();
+      const pos = (e.pageX - rect.left) / ref.current.offsetWidth;
+      videoState.setTime(pos * videoState.duration);
+    },
+    [videoState, ref]
+  );
+
+  return (
+    <div
+      ref={ref}
+      className="relative m-1 my-4 h-4 w-48 overflow-hidden rounded-full border border-white bg-denim-100"
+      onClick={handleClick}
+    >
+      <div
+        className="absolute inset-y-0 left-0 bg-denim-700 opacity-50"
+        style={{
+          width: bufferProgress,
+        }}
+      />
+      <div
+        className="absolute inset-y-0 left-0 bg-denim-700"
+        style={{
+          width: watchProgress,
+        }}
+      />
+    </div>
+  );
+}
diff --git a/src/components/video/controls/VolumeControl.tsx b/src/components/video/controls/VolumeControl.tsx
new file mode 100644
index 00000000..92499ee6
--- /dev/null
+++ b/src/components/video/controls/VolumeControl.tsx
@@ -0,0 +1,34 @@
+import { useCallback, useRef } from "react";
+import { useVideoPlayerState } from "../VideoContext";
+
+export function VolumeControl() {
+  const { videoState } = useVideoPlayerState();
+  const ref = useRef<HTMLDivElement>(null);
+
+  const percentage = `${(videoState.volume * 100).toFixed(2)}%`;
+
+  const handleClick = useCallback(
+    (e: React.MouseEvent<HTMLElement>) => {
+      if (!ref.current) return;
+      const rect = ref.current.getBoundingClientRect();
+      const pos = (e.pageX - rect.left) / ref.current.offsetWidth;
+      videoState.setVolume(pos);
+    },
+    [videoState, ref]
+  );
+
+  return (
+    <div
+      ref={ref}
+      className="relative m-1 my-4 h-4 w-48 overflow-hidden rounded-full border border-white bg-bink-300"
+      onClick={handleClick}
+    >
+      <div
+        className="absolute inset-y-0 left-0 bg-bink-700"
+        style={{
+          width: percentage,
+        }}
+      />
+    </div>
+  );
+}
diff --git a/src/components/video/hooks/controlVideo.ts b/src/components/video/hooks/controlVideo.ts
index 824a8d42..f4e2bdcb 100644
--- a/src/components/video/hooks/controlVideo.ts
+++ b/src/components/video/hooks/controlVideo.ts
@@ -3,6 +3,8 @@ export interface PlayerControls {
   pause(): void;
   exitFullscreen(): void;
   enterFullscreen(): void;
+  setTime(time: number): void;
+  setVolume(volume: number): void;
 }
 
 export const initialControls: PlayerControls = {
@@ -10,6 +12,8 @@ export const initialControls: PlayerControls = {
   pause: () => null,
   enterFullscreen: () => null,
   exitFullscreen: () => null,
+  setTime: () => null,
+  setVolume: () => null,
 };
 
 export function populateControls(
@@ -31,5 +35,19 @@ export function populateControls(
       if (!document.fullscreenElement) return;
       document.exitFullscreen();
     },
+    setTime(t) {
+      // clamp time between 0 and max duration
+      let time = Math.min(t, player.duration);
+      time = Math.max(0, time);
+      // eslint-disable-next-line no-param-reassign
+      player.currentTime = time;
+    },
+    setVolume(v) {
+      // clamp time between 0 and 1
+      let volume = Math.min(v, 1);
+      volume = Math.max(0, volume);
+      // eslint-disable-next-line no-param-reassign
+      player.volume = volume;
+    },
   };
 }
diff --git a/src/components/video/hooks/useVideoPlayer.ts b/src/components/video/hooks/useVideoPlayer.ts
index 029f8cc8..9682b7bd 100644
--- a/src/components/video/hooks/useVideoPlayer.ts
+++ b/src/components/video/hooks/useVideoPlayer.ts
@@ -4,12 +4,17 @@ import {
   PlayerControls,
   populateControls,
 } from "./controlVideo";
+import { handleBuffered } from "./utils";
 
 export type PlayerState = {
   isPlaying: boolean;
   isPaused: boolean;
   isSeeking: boolean;
   isFullscreen: boolean;
+  time: number;
+  duration: number;
+  volume: number;
+  buffered: number;
 } & PlayerControls;
 
 export const initialPlayerState: PlayerState = {
@@ -17,6 +22,10 @@ export const initialPlayerState: PlayerState = {
   isPaused: true,
   isFullscreen: false,
   isSeeking: false,
+  time: 0,
+  duration: 0,
+  volume: 0,
+  buffered: 0,
   ...initialControls,
 };
 
@@ -30,26 +39,77 @@ function readState(player: HTMLVideoElement, update: SetPlayer) {
   state.isPlaying = !player.paused;
   state.isFullscreen = !!document.fullscreenElement;
   state.isSeeking = player.seeking;
+  state.time = player.currentTime;
+  state.duration = player.duration;
+  state.volume = player.volume;
+  state.buffered = handleBuffered(player.currentTime, player.buffered);
 
   update(state);
 }
 
 function registerListeners(player: HTMLVideoElement, update: SetPlayer) {
-  player.addEventListener("pause", () => {
+  const pause = () => {
     update((s) => ({ ...s, isPaused: true, isPlaying: false }));
-  });
-  player.addEventListener("play", () => {
+  };
+  const play = () => {
     update((s) => ({ ...s, isPaused: false, isPlaying: true }));
-  });
-  player.addEventListener("seeking", () => {
+  };
+  const seeking = () => {
     update((s) => ({ ...s, isSeeking: true }));
-  });
-  player.addEventListener("seeked", () => {
+  };
+  const seeked = () => {
     update((s) => ({ ...s, isSeeking: false }));
-  });
-  document.addEventListener("fullscreenchange", () => {
+  };
+  const fullscreenchange = () => {
     update((s) => ({ ...s, isFullscreen: !!document.fullscreenElement }));
-  });
+  };
+  const timeupdate = () => {
+    update((s) => ({
+      ...s,
+      duration: player.duration,
+      time: player.currentTime,
+    }));
+  };
+  const loadedmetadata = () => {
+    update((s) => ({
+      ...s,
+      duration: player.duration,
+    }));
+  };
+  const volumechange = () => {
+    update((s) => ({
+      ...s,
+      volume: player.volume,
+    }));
+  };
+  const progress = () => {
+    update((s) => ({
+      ...s,
+      buffered: handleBuffered(player.currentTime, player.buffered),
+    }));
+  };
+
+  player.addEventListener("pause", pause);
+  player.addEventListener("play", play);
+  player.addEventListener("seeking", seeking);
+  player.addEventListener("seeked", seeked);
+  document.addEventListener("fullscreenchange", fullscreenchange);
+  player.addEventListener("timeupdate", timeupdate);
+  player.addEventListener("loadedmetadata", loadedmetadata);
+  player.addEventListener("volumechange", volumechange);
+  player.addEventListener("progress", progress);
+
+  return () => {
+    player.removeEventListener("pause", pause);
+    player.removeEventListener("play", play);
+    player.removeEventListener("seeking", seeking);
+    player.removeEventListener("seeked", seeked);
+    document.removeEventListener("fullscreenchange", fullscreenchange);
+    player.removeEventListener("timeupdate", timeupdate);
+    player.removeEventListener("loadedmetadata", loadedmetadata);
+    player.removeEventListener("volumechange", volumechange);
+    player.removeEventListener("progress", progress);
+  };
 }
 
 export function useVideoPlayer(
diff --git a/src/components/video/hooks/utils.ts b/src/components/video/hooks/utils.ts
new file mode 100644
index 00000000..ee19ae6a
--- /dev/null
+++ b/src/components/video/hooks/utils.ts
@@ -0,0 +1,8 @@
+export function handleBuffered(time: number, buffered: TimeRanges): number {
+  for (let i = 0; i < buffered.length; i += 1) {
+    if (buffered.start(buffered.length - 1 - i) < time) {
+      return buffered.end(buffered.length - 1 - i);
+    }
+  }
+  return 0;
+}
diff --git a/src/views/TestView.tsx b/src/views/TestView.tsx
index c87eceba..fdc3d8e6 100644
--- a/src/views/TestView.tsx
+++ b/src/views/TestView.tsx
@@ -1,17 +1,34 @@
 import { FullscreenControl } from "@/components/video/controls/FullscreenControl";
 import { PauseControl } from "@/components/video/controls/PauseControl";
+import { ProgressControl } from "@/components/video/controls/ProgressControl";
 import { SourceControl } from "@/components/video/controls/SourceControl";
+import { VolumeControl } from "@/components/video/controls/VolumeControl";
 import { VideoPlayer } from "@/components/video/VideoPlayer";
 
 // test videos: https://gist.github.com/jsturgis/3b19447b304616f18657
 
+// TODO video todos:
+//  - captions
+//  - make pretty
+//  - show fullscreen button depending on is available (document.fullscreenEnabled)
+//  - better seeking
+//  - improve seekables
+//  - buffering
+//  - error handling
+//  - auto-play prop option
+//  - middle pause button
+//  - improve pausing while seeking/buffering
+//  - captions
+//  - show formatted time
 export function TestView() {
   return (
     <div className="w-[40rem] max-w-full">
       <VideoPlayer>
         <PauseControl />
         <FullscreenControl />
-        <SourceControl source="http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4" />
+        <ProgressControl />
+        <VolumeControl />
+        <SourceControl source="http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/Sintel.mp4" />
       </VideoPlayer>
     </div>
   );