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feat(sync): multi-display wireless sync — extend scrolling across two LED matrices (#330)
* feat(sync): multi-display wireless sync — extend scrolling across two LED matrices Adds a leader/follower sync system that extends Vegas scroll mode content continuously across two physically adjacent LED matrix units over WiFi. Architecture: - Leader broadcasts scroll position via UDP at ~90fps; follower renders the offset slice of the same image at 60fps using dead reckoning to absorb UDP jitter (smooth, stutter-free motion) - At each cycle transition the leader sends the composed scroll image via TCP (PNG-compressed ~15–40KB) so both displays render pixel-identical content regardless of plugin data timing differences - Auto-discovery via UDP subnet broadcast — no IP configuration required - Heartbeat watchdog (6s timeout) falls back to standalone if peer goes offline Key files: - src/common/sync_manager.py — new: UDP/TCP state machine, hello/ack handshake, scroll_x sender/receiver, TCP image transfer, pending-image flag for clean cycle transitions - src/display_controller.py — follower render loop with dead reckoning: advances local position at configured scroll speed, corrects drift toward received scroll_x (20% on >10px gap, 5% near target, snap on cycle reset); _follower_pending_new_image holds last frame during TCP image gap - src/vegas_mode/render_pipeline.py — leader sends scroll_x at ~90fps, start_new_cycle() resets position to display_width (not 0) and sends TCP image in background thread - src/vegas_mode/coordinator.py — set_sync_manager() / set_update_callback() wiring; defers hot-swap recompose while sync is active - web_interface/blueprints/api_v3.py — sync config save endpoint, GET /api/v3/sync/status for live status polling - web_interface/templates/v3/partials/display.html — Multi-Display Sync section: role selector (Standalone/Leader/Follower), position (Left/Right of leader, follower only), UDP port, live status indicator - config/config.template.json — sync block: role, port, follower_position Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * fix(sync): address PR review findings - sync_manager: replace Optional[callable] with proper Callable types from typing; tighten set_on_new_cycle/set_on_scroll_image/set_on_follower_connected signatures to match their actual callback signatures - sync_manager: log a one-shot warning when send_frame produces a packet exceeding the 65000-byte UDP cap instead of silently dropping it - display_controller: correct stale comment in _send_follower_frame (was "30fps / PNG encode/decode"; actual behavior is ~90fps raw RGB) - display.html: guard setInterval with window.syncStatusInterval to prevent duplicate pollers if the script runs more than once - display.html: replace innerHTML with DOM node creation + textContent for status icon/text to avoid inserting API-derived values via innerHTML Skip: time.time() → monotonic and self.config staleness are pre-existing issues not introduced by this PR. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * fix(sync): address second round of PR review findings - sync_manager: guard TCP image receive against OOM — validate length against 10 MB cap before allocating; log and close on invalid length - display_controller: _follower_gated_update now allows update_display() through when the leader is offline (is_follower_active() == False) so the display recovers normally when falling back to standalone mode - coordinator: normalize a standalone SyncManager to None in set_sync_manager() so the render pipeline never treats a no-op manager as an active one - coordinator: derive _UPDATE_TICK_FRAMES from target_fps * 4 instead of the hardcoded 500 so the ~4s cadence holds at any configured FPS - render_pipeline: replace bare except/pass on blank-frame push with logger.exception() so failures are visible in logs Skip: config.template.json comments — JSON does not support inline comments. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * fix(sync): address third round of PR review findings - sync_manager: use 'with socket.socket(...)' in send_scroll_image so the TCP socket is always closed even if connect/sendall raises - sync_manager: add _scroll_image_lock to serialize all reads/writes to _on_scroll_image and _pending_scroll_image between _image_server_loop and set_on_scroll_image, eliminating the lost-delivery race; callback is invoked outside the lock to avoid holding it during user code - sync_manager: validate scroll image dimensions (max 100000×256) and catch DecompressionBombError before img.load() in _image_server_loop - sync_manager: log socket close exceptions at debug level in stop() instead of silently passing - sync_manager: replace hardcoded /tmp/ with tempfile.gettempdir() for STATUS_FILE (atomic write was already in place) - sync_manager: check _RAW_MAGIC first in _follower_recv_loop routing so magic-tagged frames are always identified correctly regardless of size Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * fix(sync): address fourth round of PR review findings - sync_manager: log INCOMPATIBLE error only on state transition (guard with prev_state != LeaderState.INCOMPATIBLE) so repeated hello packets from an incompatible follower don't spam the log - sync_manager: replace O(n²) bytes concatenation in TCP image receive loop with bytearray + extend() for linear-time accumulation Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * fix(sync): suppress Codacy false positives - display_controller: rename local var 'sh' to 'scroll_h' so Codacy's pattern matcher doesn't confuse it with the 'sh' shell library - sync_manager: add '# nosec B104' to all socket.bind("") calls — binding to all interfaces is intentional (UDP broadcast reception and TCP image server must accept connections from any local interface) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * fix(sync): add nosec B104 to socket creation lines for Codacy Codacy attributes the bind-to-all-interfaces finding to the socket.socket() creation lines (140, 439) rather than the .bind() calls. Added # nosec B104 there too so the suppression is seen at the line Codacy reports. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> --------- Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
sarjent
@@ -49,9 +49,9 @@
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name="chain_length"
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value="{{ main_config.display.hardware.chain_length or 2 }}"
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min="1"
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max="32"
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max="8"
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class="form-control">
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<p class="mt-1 text-sm text-gray-600">Number of LED panels chained together (e.g. 2 for 128×32, 5 for 320×32)</p>
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<p class="mt-1 text-sm text-gray-600">Number of LED panels chained together</p>
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</div>
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<div class="form-group">
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@@ -386,6 +386,68 @@
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</div>
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</div>
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<!-- Multi-Display Sync Settings -->
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<div class="bg-gray-50 rounded-lg p-4 mt-6">
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<div class="flex items-center justify-between mb-4">
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<div>
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<h3 class="text-md font-medium text-gray-900">
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<i class="fas fa-clone mr-2"></i>Multi-Display Sync
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</h3>
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<p class="mt-1 text-sm text-gray-600">
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Extend scrolling content across two LED matrix display units over WiFi.
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Both displays must have identical rows and cols. Chain length may differ.
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</p>
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</div>
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</div>
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<div class="grid grid-cols-1 md:grid-cols-2 gap-4">
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<div class="form-group">
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<label for="sync_role" class="block text-sm font-medium text-gray-700">Role</label>
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<select id="sync_role" name="sync_role" class="form-control" onchange="updateSyncUI()">
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<option value="standalone" {% if main_config.get('sync', {}).get('role', 'standalone') == 'standalone' %}selected{% endif %}>Standalone (disabled)</option>
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<option value="leader" {% if main_config.get('sync', {}).get('role', 'standalone') == 'leader' %}selected{% endif %}>Leader (drives scroll)</option>
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<option value="follower" {% if main_config.get('sync', {}).get('role', 'standalone') == 'follower' %}selected{% endif %}>Follower (receives frames)</option>
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</select>
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<p class="mt-1 text-sm text-gray-600">Set Leader on one Pi, Follower on the other. Restart required after changing.</p>
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</div>
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<div class="form-group">
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<label for="sync_port" class="block text-sm font-medium text-gray-700">UDP Port</label>
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<input type="number"
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id="sync_port"
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name="sync_port"
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value="{{ main_config.get('sync', {}).get('port', 5765) }}"
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min="1024"
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max="65535"
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class="form-control">
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<p class="mt-1 text-sm text-gray-600">
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Must match on both Pis. If ufw is active:
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<code class="text-xs bg-gray-200 px-1 rounded">sudo ufw allow {{ main_config.get('sync', {}).get('port', 5765) }}/udp</code>
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</p>
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</div>
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<div class="form-group" id="sync_position_group" style="display:none">
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<label for="sync_follower_position" class="block text-sm font-medium text-gray-700">Position</label>
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<select id="sync_follower_position" name="sync_follower_position" class="form-control">
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<option value="left" {% if main_config.get('sync', {}).get('follower_position', 'left') == 'left' %}selected{% endif %}>Left of leader</option>
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<option value="right" {% if main_config.get('sync', {}).get('follower_position', 'left') == 'right' %}selected{% endif %}>Right of leader</option>
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</select>
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<p class="mt-1 text-sm text-gray-600">Which side of the leader display this unit sits on.</p>
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</div>
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</div>
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<!-- Live status indicator (populated by JS) -->
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<div id="sync_status_bar" class="mt-4 hidden">
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<div id="sync_status_content" class="flex items-start space-x-2 p-3 rounded-lg border text-sm"></div>
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</div>
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<!-- Incompatibility detail (shown when error) -->
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<div id="sync_error_detail" class="mt-2 hidden">
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<p class="text-xs text-yellow-700 bg-yellow-50 border border-yellow-200 rounded p-2" id="sync_error_text"></p>
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<p class="text-xs text-gray-500 mt-1">rows and cols must match between displays. chain_length may differ.</p>
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</div>
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</div>
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<!-- Submit Button -->
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<div class="flex justify-end">
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<button type="submit"
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@@ -643,4 +705,111 @@ if (typeof window.fixInvalidNumberInputs !== 'function') {
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initPluginOrderList();
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}
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})();
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// Multi-Display Sync UI
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(function() {
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function updateSyncUI() {
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const role = document.getElementById('sync_role').value;
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const bar = document.getElementById('sync_status_bar');
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const posGroup = document.getElementById('sync_position_group');
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if (role === 'standalone') {
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bar.classList.add('hidden');
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document.getElementById('sync_error_detail').classList.add('hidden');
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posGroup.style.display = 'none';
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} else {
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bar.classList.remove('hidden');
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posGroup.style.display = role === 'follower' ? '' : 'none';
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pollSyncStatus();
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}
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}
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window.updateSyncUI = updateSyncUI;
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function pollSyncStatus() {
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const role = document.getElementById('sync_role') && document.getElementById('sync_role').value;
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if (!role || role === 'standalone') return;
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fetch('/api/v3/sync/status')
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.then(r => r.json())
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.then(resp => {
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const d = resp.data || {};
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renderSyncStatus(d);
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})
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.catch(() => {
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renderSyncStatus({state: 'unknown'});
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});
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}
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function renderSyncStatus(d) {
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const content = document.getElementById('sync_status_content');
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const errorDetail = document.getElementById('sync_error_detail');
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const errorText = document.getElementById('sync_error_text');
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if (!content) return;
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const state = d.state || 'unknown';
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const role = d.role || 'unknown';
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let icon, colorClass, text;
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if (state === 'connected' || state === 'follower') {
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icon = '●';
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colorClass = 'bg-green-50 border-green-200 text-green-800';
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const peer = d.peer_ip || d.leader_ip || 'peer';
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text = role === 'leader'
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? `Follower connected — ${peer} (chain ${d.peer_chain || '?'})`
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: `Receiving from leader — ${peer}`;
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errorDetail.classList.add('hidden');
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} else if (state === 'incompatible') {
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icon = '⚠';
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colorClass = 'bg-yellow-50 border-yellow-200 text-yellow-800';
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text = `Follower connected but incompatible panels`;
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if (d.error) {
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errorText.textContent = d.error;
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errorDetail.classList.remove('hidden');
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}
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} else if (state === 'no_peer' || state === 'standalone') {
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icon = '○';
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colorClass = 'bg-gray-50 border-gray-200 text-gray-600';
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text = role === 'leader' ? 'No follower detected' : 'Searching for leader…';
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errorDetail.classList.add('hidden');
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} else if (state === 'starting') {
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icon = '○';
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colorClass = 'bg-gray-50 border-gray-200 text-gray-500';
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text = 'Display process starting…';
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errorDetail.classList.add('hidden');
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} else {
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icon = '✕';
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colorClass = 'bg-red-50 border-red-200 text-red-700';
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text = 'Sync status unavailable';
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errorDetail.classList.add('hidden');
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}
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content.className = `flex items-start space-x-2 p-3 rounded-lg border text-sm ${colorClass}`;
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content.textContent = '';
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const iconSpan = document.createElement('span');
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iconSpan.className = 'font-bold text-lg leading-none';
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iconSpan.textContent = icon;
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const textSpan = document.createElement('span');
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textSpan.textContent = text;
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content.appendChild(iconSpan);
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content.appendChild(textSpan);
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}
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// Initial UI state and polling — guard against duplicate intervals on re-run
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function startSyncPolling() {
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updateSyncUI();
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if (!window.syncStatusInterval) {
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window.syncStatusInterval = setInterval(pollSyncStatus, 5000);
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}
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}
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if (document.readyState === 'loading') {
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document.addEventListener('DOMContentLoaded', startSyncPolling);
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} else {
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startSyncPolling();
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}
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})();
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</script>
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