Pre-convert recordings for playback

Convert the recordings ahead of time instead of during the playback.
That way we aren't messing up the profiling with time spent converting
data, rather than processing it.

tests/playback-ui.js

@@ -2,9 +2,9 @@
 
 import * as WebUtil from '../app/webutil.js';
 import RecordingPlayer from './playback.js';
+import Base64 from '../core/base64.js';
 
 let frames = null;
-let encoding = null;
 
 function message(str) {
     const cell = document.getElementById('messages');
@@ -19,7 +19,7 @@ function loadFile() {
         return Promise.reject("Must specify data=FOO in query string.");
     }
 
-    message("Loading " + fname);
+    message("Loading " + fname + "...");
 
     return new Promise((resolve, reject) => {
         const script = document.createElement("script");
@@ -41,21 +41,62 @@ function enableUI() {
         document.getElementById('mode1').checked = true;
     }
 
-    message("VNC_frame_data.length: " + VNC_frame_data.length);
+    message("Loaded " + VNC_frame_data.length + " frames");
 
     const startButton = document.getElementById('startButton');
     startButton.disabled = false;
     startButton.addEventListener('click', start);
 
+    message("Converting...");
+
     frames = VNC_frame_data;
+
+    let encoding;
     // Only present in older recordings
     if (window.VNC_frame_encoding) {
         encoding = VNC_frame_encoding;
+    } else {
+        let frame = frames[0];
+        let start = frame.indexOf('{', 1) + 1;
+        if (frame.slice(start).startsWith('UkZC')) {
+            encoding = 'base64';
+        } else {
+            encoding = 'binary';
         }
+    }
+
+    for (let i = 0;i < frames.length;i++) {
+        let frame = frames[i];
+
+        if (frame === "EOF") {
+            frames.splice(i);
+            break;
+        }
+
+        let dataIdx = frame.indexOf('{', 1) + 1;
+
+        let time = parseInt(frame.slice(1, dataIdx - 1));
+
+        let u8;
+        if (encoding === 'base64') {
+            u8 = Base64.decode(frame.slice(dataIdx));
+        } else {
+            u8 = new Uint8Array(frame.length - dataIdx);
+            for (let j = 0; j < frame.length - dataIdx; j++) {
+                u8[j] = frame.charCodeAt(dataIdx + j);
+            }
+        }
+
+        frames[i] = { fromClient: frame[0] === '}',
+                      timestamp: time,
+                      data: u8 };
+    }
+
+    message("Ready");
 }
 
 class IterationPlayer {
-    constructor(iterations, frames, encoding) {
+    constructor(iterations, frames) {
         this._iterations = iterations;
 
         this._iteration = undefined;
@@ -64,7 +105,6 @@ class IterationPlayer {
         this._start_time = undefined;
 
         this._frames = frames;
-        this._encoding = encoding;
 
         this._state = 'running';
 
@@ -84,7 +124,7 @@ class IterationPlayer {
     }
 
     _nextIteration() {
-        const player = new RecordingPlayer(this._frames, this._encoding, this._disconnected.bind(this));
+        const player = new RecordingPlayer(this._frames, this._disconnected.bind(this));
         player.onfinish = this._iterationFinish.bind(this);
 
         if (this._state !== 'running') { return; }
@@ -147,7 +187,7 @@ function start() {
         mode = 'realtime';
     }
 
-    const player = new IterationPlayer(iterations, frames, encoding);
+    const player = new IterationPlayer(iterations, frames);
     player.oniterationfinish = (evt) => {
         message(`Iteration ${evt.number} took ${evt.duration}ms`);
     };

tests/playback.js

@@ -6,7 +6,6 @@
 
 import RFB from '../core/rfb.js';
 import * as Log from '../core/util/logging.js';
-import Base64 from '../core/base64.js';
 
 // Immediate polyfill
 if (window.setImmediate === undefined) {
@@ -44,22 +43,11 @@ if (window.setImmediate === undefined) {
 }
 
 export default class RecordingPlayer {
-    constructor(frames, encoding, disconnected) {
+    constructor(frames, disconnected) {
         this._frames = frames;
-        this._encoding = encoding;
 
         this._disconnected = disconnected;
 
-        if (this._encoding === undefined) {
-            const frame = this._frames[0];
-            const start = frame.indexOf('{', 1) + 1;
-            if (frame.slice(start).startsWith('UkZC')) {
-                this._encoding = 'base64';
-            } else {
-                this._encoding = 'binary';
-            }
-        }
-
         this._rfb = undefined;
         this._frame_length = this._frames.length;
 
@@ -112,17 +100,11 @@ export default class RecordingPlayer {
         let frame = this._frames[this._frame_index];
 
         // skip send frames
-        while (this._frame_index < this._frame_length && frame.charAt(0) === "}") {
+        while (this._frame_index < this._frame_length && frame.fromClient) {
             this._frame_index++;
             frame = this._frames[this._frame_index];
         }
 
-        if (frame === 'EOF') {
-            Log.Debug('Finished, found EOF');
-            this._finish();
-            return;
-        }
-
         if (this._frame_index >= this._frame_length) {
             Log.Debug('Finished, no more frames');
             this._finish();
@@ -130,9 +112,8 @@ export default class RecordingPlayer {
         }
 
         if (this._realtime) {
-            const foffset = frame.slice(1, frame.indexOf('{', 1));
             const toffset = (new Date()).getTime() - this._start_time;
-            let delay = foffset - toffset;
+            let delay = frame.timestamp - toffset;
             if (delay < 1) delay = 1;
 
             setTimeout(this._doPacket.bind(this), delay);
@@ -154,19 +135,8 @@ export default class RecordingPlayer {
         }
 
         const frame = this._frames[this._frame_index];
-        let start = frame.indexOf('{', 1) + 1;
-        let u8;
-        if (this._encoding === 'base64') {
-            u8 = Base64.decode(frame.slice(start));
-            start = 0;
-        } else {
-            u8 = new Uint8Array(frame.length - start);
-            for (let i = 0; i < frame.length - start; i++) {
-                u8[i] = frame.charCodeAt(start + i);
-            }
-        }
 
-        this._rfb._sock._recv_message({'data': u8});
+        this._rfb._sock._recv_message({'data': frame.data});
         this._frame_index++;
 
         this._queueNextPacket();