1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
// This is the core JavaScript for the Spectrogram Editor.
// It handles file loading (.spec), visualization, tool interaction, and saving.
// --- Global Variables ---
let currentSpecData = null; // Stores the parsed spectrogram data
let dctSize = 512; // Default DCT size, read from header
let undoStack = [];
let redoStack = [];
const MAX_HISTORY_SIZE = 50;
// --- File Handling ---
const specFileInput = document.getElementById('specFileInput');
specFileInput.addEventListener('change', handleFileSelect);
async function handleFileSelect(event) {
const file = event.target.files[0];
if (!file) {
return;
}
try {
const buffer = await file.arrayBuffer();
const dataView = new DataView(buffer);
// Parse SPEC header
const header = {
magic: String.fromCharCode(...new Uint8Array(buffer.slice(0, 4))),
version: dataView.getInt32(4, true),
dct_size: dataView.getInt32(8, true),
num_frames: dataView.getInt32(12, true)
};
if (header.magic !== "SPEC" || header.version !== 1) {
console.error("Invalid SPEC file format.");
alert("Invalid SPEC file format. Please load a valid .spec file.");
return;
}
dctSize = header.dct_size;
const dataStart = 16;
const numBytes = header.num_frames * header.dct_size * Float32Array.BYTES_PER_ELEMENT;
const spectralDataFloat = new Float32Array(buffer, dataStart, header.num_frames * header.dct_size);
currentSpecData = {
header: header,
data: spectralDataFloat
};
console.log("Loaded SPEC file:", header);
drawSpectrogram(currentSpecData);
} catch (error) {
console.error("Error loading SPEC file:", error);
alert("Failed to load SPEC file. Check console for details.");
}
}
// --- Spectrogram Visualization ---
const canvas = document.getElementById('spectrogramCanvas');
const ctx = canvas.getContext('2d');
function drawSpectrogram(specData) {
if (!specData || !specData.data) {
console.warn("No spectrogram data to draw.");
return;
}
const width = canvas.width = window.innerWidth * 0.7; // Example dimensions
const height = canvas.height = 400; // Example dimensions
ctx.clearRect(0, 0, width, height);
ctx.fillStyle = '#ffffff';
ctx.fillRect(0, 0, width, height);
const numFrames = specData.header.num_frames;
const binsPerFrame = specData.data.length / numFrames;
if (numFrames === 0 || binsPerFrame === 0) {
console.warn("Spectrogram has no frames or invalid data.");
return;
}
// Simplified visualization: draw a few lines to represent frames
const frameWidth = width / numFrames;
ctx.strokeStyle = '#000000';
ctx.lineWidth = 1;
ctx.beginPath();
// Draw a simplified representation of the first frame
const frameIndex = 0;
const frameDataStart = frameIndex * dctSize;
const maxVal = 1.0; // Assume normalization or known range for now
for (let i = 0; i < dctSize; ++i) {
const value = specData.data[frameDataStart + i];
const x = (i / dctSize) * width;
const y = height - (Math.abs(value) / maxVal) * height * 0.5; // Simplified scaling
if (i === 0) {
ctx.moveTo(x, y);
} else {
ctx.lineTo(x, y);
}
}
ctx.stroke();
}
// --- Tool Interactions ---
const lineToolButton = document.getElementById('lineTool');
const ellipseToolButton = document.getElementById('ellipseTool');
const noiseToolButton = document.getElementById('noiseTool');
const undoButton = document.getElementById('undoButton');
lineToolButton.addEventListener('click', () => console.log('Line tool selected'));
ellipseToolButton.addEventListener('click', () => console.log('Ellipse tool selected'));
noiseToolButton.addEventListener('click', () => console.log('Noise tool selected'));
undoButton.addEventListener('click', handleUndo);
// --- Undo/Redo Logic ---
function addAction(action) {
undoStack.push(action);
// Limit history size
if (undoStack.length > MAX_HISTORY_SIZE) {
undoStack.shift(); // Remove oldest action
}
redoStack = []; // Clear redo stack on new action
updateUndoRedoButtons();
}
function handleUndo() {
if (undoStack.length === 0) {
console.log('Undo stack is empty.');
return;
}
const actionToUndo = undoStack.pop();
actionToUndo.undo(); // Execute the inverse operation
redoStack.push(actionToUndo);
redrawCanvas(); // Redraw canvas to reflect the undo operation
updateUndoRedoButtons();
}
function handleRedo() {
if (redoStack.length === 0) {
console.log('Redo stack is empty.');
return;
}
const actionToRedo = redoStack.pop();
actionToRedo.redo(); // Re-apply the action
undoStack.push(actionToRedo);
redrawCanvas(); // Redraw canvas to reflect the redo operation
updateUndoRedoButtons();
}
function redrawCanvas() {
// This function needs to be implemented to redraw the entire canvas state
// based on the current undoStack. For now, it's a placeholder.
console.log('Redrawing canvas...');
if (currentSpecData) {
drawSpectrogram(currentSpecData);
} else {
// Clear canvas if no data is loaded
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.fillStyle = '#ffffff';
ctx.fillRect(0, 0, canvas.width, canvas.height);
}
}
function updateUndoRedoButtons() {
// Enable/disable buttons based on stack emptiness
undoButton.disabled = undoStack.length === 0;
// redoButton.disabled = redoStack.length === 0; // If redo button exists
}
// Initial setup for canvas size (can be updated on window resize)
window.addEventListener('resize', () => {
if (currentSpecData) {
drawSpectrogram(currentSpecData);
}
});
// Initial call to set button states and potentially draw initial state if any is loaded
updateUndoRedoButtons();
|
