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Add per-channel hybrid audio spread spectrum and env feature toggles

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Spread spectrum v2: independent per-channel embedding with round-robin
bit distribution, preserving spatial stereo/surround mix. Adaptive chip
tiers (256/512/1024) trade capacity for lossy codec robustness. LFE
channel skipped for 5.1+ layouts. v2 header (20B) with backward-
compatible v0 decode fallback.

Environment toggles (STEGASOO_AUDIO, STEGASOO_VIDEO) gate audio/video
features for minimal builds (e.g. Raspberry Pi image-only). Values:
auto (default, detect deps), 1/true (force on), 0/false (force off).

Web UI fixes: accordion defaults to step 1 on load, chevron arrow
styling, required attribute toggling for audio carrier type switch,
"Images & Mode" renamed to "Reference, Carrier, Mode".

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
adlee-was-taken
2026-02-28 11:58:40 -05:00
parent 0248bec813
commit ef5a9ce9cb
41 changed files with 4281 additions and 732 deletions
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62
frontends/web/templates/encode_result.html
View File

@@ -12,12 +12,26 @@
</h5>
</div>
<div class="card-body text-center">
{% if carrier_type == 'audio' %}
<!-- Audio Preview -->
<div class="my-4">
<div class="text-center">
<i class="bi bi-music-note-beamed text-success" style="font-size: 4rem;"></i>
<div class="mt-2">
<audio controls src="{{ url_for('encode_file_route', file_id=file_id) }}" class="w-100" style="max-width: 400px;"></audio>
</div>
<div class="mt-2 small text-muted">
<i class="bi bi-music-note-beamed me-1"></i>Encoded Audio Preview
</div>
</div>
</div>
{% else %}
<div class="my-4">
{% if thumbnail_url %}
<!-- Thumbnail of the actual encoded image -->
<div class="encoded-image-thumbnail">
<img src="{{ thumbnail_url }}"
alt="Encoded image thumbnail"
<img src="{{ thumbnail_url }}"
alt="Encoded image thumbnail"
class="img-thumbnail rounded"
style="max-width: 250px; max-height: 250px; object-fit: contain;">
<div class="mt-2 small text-muted">
@@ -29,8 +43,9 @@
<i class="bi bi-file-earmark-image text-success" style="font-size: 4rem;"></i>
{% endif %}
</div>
{% endif %}
<p class="lead mb-4">Your secret has been hidden in the image.</p>
<p class="lead mb-4">Your secret has been hidden in the {{ 'audio file' if carrier_type == 'audio' else 'image' }}.</p>
<div class="mb-3">
<code class="fs-5">{{ filename }}</code>
@@ -38,11 +53,32 @@
<!-- Mode and format badges -->
<div class="mb-4">
{% if embed_mode == 'dct' %}
{% if carrier_type == 'audio' %}
<!-- Audio mode badges -->
{% if embed_mode == 'audio_spread' %}
<span class="badge bg-warning text-dark fs-6">
<i class="bi bi-broadcast me-1"></i>Spread Spectrum
</span>
{% else %}
<span class="badge bg-primary fs-6">
<i class="bi bi-grid-3x3-gap me-1"></i>Audio LSB
</span>
{% endif %}
<span class="badge bg-info fs-6 ms-1">
<i class="bi bi-file-earmark-music me-1"></i>WAV
</span>
<div class="small text-muted mt-2">
{% if embed_mode == 'audio_spread' %}
Spread spectrum embedding in audio samples
{% else %}
LSB embedding in audio samples, WAV output
{% endif %}
</div>
{% elif embed_mode == 'dct' %}
<span class="badge bg-info fs-6">
<i class="bi bi-soundwave me-1"></i>DCT Mode
</span>
<!-- Color mode badge (v3.0.1) -->
{% if color_mode == 'color' %}
<span class="badge bg-success fs-6 ms-1">
@@ -53,7 +89,7 @@
<i class="bi bi-circle-half me-1"></i>Grayscale
</span>
{% endif %}
<!-- Output format badge -->
{% if output_format == 'jpeg' %}
<span class="badge bg-warning text-dark fs-6 ms-1">
@@ -78,7 +114,7 @@
{% endif %}
</div>
{% endif %}
{% else %}
<span class="badge bg-primary fs-6">
<i class="bi bi-grid-3x3-gap me-1"></i>LSB Mode
@@ -114,7 +150,7 @@
<div class="d-grid gap-2">
<a href="{{ url_for('encode_download', file_id=file_id) }}"
class="btn btn-primary btn-lg" id="downloadBtn">
<i class="bi bi-download me-2"></i>Download Image
<i class="bi bi-download me-2"></i>Download {{ 'Audio' if carrier_type == 'audio' else 'Image' }}
</a>
<button type="button" class="btn btn-outline-primary" id="shareBtn" style="display: none;">
@@ -129,6 +165,11 @@
<strong>Important:</strong>
<ul class="mb-0 mt-2">
<li>This file expires in <strong>10 minutes</strong></li>
{% if carrier_type == 'audio' %}
<li>Do <strong>not</strong> re-encode or convert the audio file</li>
<li>WAV format preserves your hidden data losslessly</li>
<li>Sharing via platforms that re-encode audio will destroy the hidden data</li>
{% else %}
<li>Do <strong>not</strong> resize or recompress the image</li>
{% if embed_mode == 'dct' and output_format == 'jpeg' %}
<li>JPEG format is lossy - avoid re-saving or editing</li>
@@ -141,6 +182,7 @@
<li>Color preserved - extraction works on both color and grayscale</li>
{% endif %}
{% endif %}
{% endif %}
{% if channel_mode == 'private' %}
<li><i class="bi bi-shield-lock text-warning me-1"></i>Recipient needs the <strong>same channel key</strong> to decode</li>
{% endif %}
@@ -148,7 +190,7 @@
</div>
<a href="{{ url_for('encode_page') }}" class="btn btn-outline-secondary">
<i class="bi bi-arrow-repeat me-2"></i>Encode Another Message
<i class="bi bi-arrow-repeat me-2"></i>Encode Another
</a>
</div>
</div>
@@ -162,7 +204,7 @@
const shareBtn = document.getElementById('shareBtn');
const fileUrl = "{{ url_for('encode_file_route', file_id=file_id, _external=True) }}";
const fileName = "{{ filename }}";
const mimeType = "{{ 'image/jpeg' if embed_mode == 'dct' and output_format == 'jpeg' else 'image/png' }}";
const mimeType = "{{ 'audio/wav' if carrier_type == 'audio' else ('image/jpeg' if embed_mode == 'dct' and output_format == 'jpeg' else 'image/png') }}";
if (navigator.share && navigator.canShare) {
// Check if we can share files