feat: add live subtitle offset configuration and real-time player hotkeys

JellyfinPlugin/Api/BlackBarService.cs

@@ -61,10 +61,27 @@ namespace JellyfinPlugin.Api
             return Content(string.Empty, "text/plain");
         }
 
+        [HttpGet("Config")]
+        [Produces("application/json")]
+        public IActionResult GetConfig()
+        {
+            var config = Plugin.Instance!.Configuration;
+            return Ok(new
+            {
+                cropDetectLimit = config.CropDetectLimit,
+                playbackMode = config.PlaybackMode,
+                subtitleOffsetVh = config.SubtitleOffsetVh,
+                maxParallelScans = config.MaxParallelScans
+            });
+        }
+
         [HttpGet("ClientScript.js")]
         [Produces("application/javascript")]
         public ContentResult GetClientScript()
         {
+            double defaultSubOffset = Plugin.Instance!.Configuration.SubtitleOffsetVh;
+            string defaultSubOffsetStr = defaultSubOffset.ToString(System.Globalization.CultureInfo.InvariantCulture);
+
             string js = @"
 (function() {
     console.log('Black Bar Remover: Script loaded');
@@ -73,6 +90,8 @@ namespace JellyfinPlugin.Api
     let currentCropData = null;
     window._currentPlayMethod = null;
     window._isVideoDirect = null;
+    window._configuredSubtitleOffsetVh = {SUB_OFFSET};
+    window._customSubtitleOffsetVh = null;
 
     function isTranscoding() {
         if (window._isVideoDirect === false) {
@@ -84,6 +103,85 @@ namespace JellyfinPlugin.Api
         return false;
     }
 
+    function fetchServerConfig() {
+        if (!window._originalFetch) return;
+        window._originalFetch('/BlackBarRemover/Config')
+            .then(r => r.json())
+            .then(data => {
+                if (data && typeof data.subtitleOffsetVh === 'number') {
+                    const newOffset = data.subtitleOffsetVh;
+                    if (newOffset !== window._configuredSubtitleOffsetVh) {
+                        window._configuredSubtitleOffsetVh = newOffset;
+                        console.log('Black Bar Remover: Synced configured subtitle offset:', newOffset + 'vh');
+                        if (window._customSubtitleOffsetVh === null && lastBottomPercent > 0) {
+                            updateSubtitleStyles(lastBottomPercent);
+                        }
+                    }
+                }
+            })
+            .catch(e => {});
+    }
+
+    function showSubtitleToast(msg) {
+        let toastEl = document.getElementById('black-bar-remover-sub-toast');
+        if (!toastEl) {
+            toastEl = document.createElement('div');
+            toastEl.id = 'black-bar-remover-sub-toast';
+            toastEl.style.position = 'fixed';
+            toastEl.style.bottom = '15%';
+            toastEl.style.left = '50%';
+            toastEl.style.transform = 'translateX(-50%)';
+            toastEl.style.backgroundColor = 'rgba(0, 0, 0, 0.85)';
+            toastEl.style.color = '#fff';
+            toastEl.style.padding = '8px 16px';
+            toastEl.style.borderRadius = '20px';
+            toastEl.style.fontSize = '0.95rem';
+            toastEl.style.fontWeight = 'bold';
+            toastEl.style.zIndex = '999999';
+            toastEl.style.pointerEvents = 'none';
+            toastEl.style.transition = 'opacity 0.3s ease';
+            document.body.appendChild(toastEl);
+        }
+        toastEl.textContent = msg;
+        toastEl.style.opacity = '1';
+        if (window._toastTimeout) clearTimeout(window._toastTimeout);
+        window._toastTimeout = setTimeout(() => {
+            toastEl.style.opacity = '0';
+        }, 2000);
+    }
+
+    function getActiveOffsetVh() {
+        if (window._customSubtitleOffsetVh !== null && window._customSubtitleOffsetVh !== undefined) {
+            return window._customSubtitleOffsetVh;
+        }
+        if (window._configuredSubtitleOffsetVh !== null && window._configuredSubtitleOffsetVh !== undefined) {
+            return window._configuredSubtitleOffsetVh;
+        }
+        return 5.0;
+    }
+
+    if (!window._subHotkeyBound) {
+        window._subHotkeyBound = true;
+        window.addEventListener('keydown', function(e) {
+            if (e.altKey && (e.key === 'ArrowUp' || e.key === 'ArrowDown')) {
+                const video = document.querySelector('video');
+                if (!video) return;
+                e.preventDefault();
+                let current = getActiveOffsetVh();
+                if (e.key === 'ArrowUp') {
+                    current = Math.min(25.0, current + 0.5);
+                } else if (e.key === 'ArrowDown') {
+                    current = Math.max(0.0, current - 0.5);
+                }
+                window._customSubtitleOffsetVh = Math.round(current * 10) / 10;
+                showSubtitleToast('Subtitle Offset: ' + window._customSubtitleOffsetVh.toFixed(1) + ' vh (Alt+Up/Down)');
+                if (lastBottomPercent > 0) {
+                    updateSubtitleStyles(lastBottomPercent);
+                }
+            }
+        });
+    }
+
     function ensureBoundingBoxHook(video) {
         if (!video._origGetBoundingClientRect) {
             video._origGetBoundingClientRect = video.getBoundingClientRect;
@@ -109,60 +207,53 @@ namespace JellyfinPlugin.Api
 
     let lastBottomPercent = 0;
 
-    function updateSubtitleStyles(bottomPercent) {
+    function updateSubtitleStyles(bottomPercent) {{
         lastBottomPercent = bottomPercent;
         let styleEl = document.getElementById('black-bar-remover-sub-style');
-        if (!styleEl) {
+        if (!styleEl) {{
             styleEl = document.createElement('style');
             styleEl.id = 'black-bar-remover-sub-style';
             document.head.appendChild(styleEl);
-        }
+        }}
 
-        if (bottomPercent > 0) {
-            const offsetVh = (bottomPercent * 0.4 + 2.5).toFixed(2);
-            styleEl.textContent = `
-                .videoSubtitles {
-                    display: flex !important;
-                    flex-direction: column !important;
-                    justify-content: flex-end !important;
-                    transform: translateY(-${offsetVh}vh) !important;
-                }
-                .track-text-output,
-                .custom-subtitle-overlay,
-                .subtitleSyncContainer,
-                .videoSubtitlesContainer,
-                .libassjs-canvas-parent,
-                canvas.libassjs-canvas,
-                .subtitles-octopus-canvas,
-                .htmlvideoplayer::-webkit-media-text-track-container,
-                .htmlvideoplayer::-webkit-media-text-track-display {
-                    transform: translateY(-${offsetVh}vh) !important;
-                }
-            `;
+        if (bottomPercent > 0) {{
+            const activeOffset = getActiveOffsetVh();
+            const offsetVh = activeOffset.toFixed(2);
+            styleEl.textContent = 
+                '.videoSubtitles {' +
+                    'display: flex !important;' +
+                    'flex-direction: column !important;' +
+                    'justify-content: flex-end !important;' +
+                    'transform: translateY(-' + offsetVh + 'vh) !important;' +
+                '}' +
+                '.track-text-output, .custom-subtitle-overlay, .subtitleSyncContainer, .videoSubtitlesContainer, .libassjs-canvas-parent, canvas.libassjs-canvas, .subtitles-octopus-canvas, .htmlvideoplayer::-webkit-media-text-track-container, .htmlvideoplayer::-webkit-media-text-track-display {' +
+                    'transform: translateY(-' + offsetVh + 'vh) !important;' +
+                '}';
             console.log('Black Bar Remover: Subtitle CSS style updated translateY(-' + offsetVh + 'vh)');
-        } else {
+        }} else {{
             styleEl.textContent = '';
-        }
-    }
+        }}
+    }}
 
-    function adjustVttCues(bottomPercent) {
+    function adjustVttCues(bottomPercent) {{
         const video = document.querySelector('video');
         if (!video || !video.textTracks) return;
-        const targetLine = Math.max(10, 92 - Math.round(bottomPercent * 0.4 + 2.5));
-        for (let i = 0; i < video.textTracks.length; i++) {
+        const activeOffset = getActiveOffsetVh();
+        const targetLine = Math.max(10, 95 - Math.round(activeOffset * 1.5));
+        for (let i = 0; i < video.textTracks.length; i++) {{
             const track = video.textTracks[i];
-            if (track && track.cues) {
-                for (let j = 0; j < track.cues.length; j++) {
+            if (track && track.cues) {{
+                for (let j = 0; j < track.cues.length; j++) {{
                     const cue = track.cues[j];
-                    if (cue && !cue._pluginAdjusted) {
+                    if (cue && !cue._pluginAdjusted) {{
                         cue.snapToLines = false;
                         cue.line = targetLine;
                         cue._pluginAdjusted = true;
-                    }
-                }
+                    }}
+                }}
             }
-        }
-    }
+        }}
+    }}
 
     function applyCrop(cropData) {
         const video = document.querySelector('video');
@@ -376,6 +467,7 @@ namespace JellyfinPlugin.Api
     playbackInfoObserver.observe(document.body, { childList: true, subtree: true, characterData: true });
 
     setInterval(() => {
+        fetchServerConfig();
         const video = document.querySelector('video');
         if (video && interceptedItemId && interceptedItemId !== currentItemId) {
             currentItemId = interceptedItemId;
@@ -393,6 +485,7 @@ namespace JellyfinPlugin.Api
     }, 2000);
 })();
 ";
+            js = js.Replace("{SUB_OFFSET}", defaultSubOffsetStr);
             return Content(js, "application/javascript");
         }
     }

JellyfinPlugin/Configuration/PluginConfiguration.cs

@@ -15,5 +15,8 @@ namespace JellyfinPlugin.Configuration
 
         // Maksymalna liczba równoległych wątków skanowania czarnych pasów (1 - 16, domyślnie 4)
         public int MaxParallelScans { get; set; } = 4;
+
+        // Przesunięcie pionowe napisów w vh w trybie klienckim CSS (0.0 - 25.0, domyślnie 5.0)
+        public double SubtitleOffsetVh { get; set; } = 5.0;
     }
 }

JellyfinPlugin/Configuration/configPage.html

@@ -39,6 +39,12 @@
                         <div class="fieldDescription">Number of files to analyze concurrently during library scheduled tasks. Default is 4. Higher values speed up library scans on multi-core CPUs.</div>
                     </div>
 
+                    <div class="inputContainer">
+                        <label class="inputLabel inputLabelUnfocused" for="txtSubtitleOffsetVh">Client Subtitle Offset (0.0 - 25.0 vh):</label>
+                        <input type="number" step="0.5" min="0.0" max="25.0" id="txtSubtitleOffsetVh" is="emby-input" required />
+                        <div class="fieldDescription">Vertical offset shift for subtitles in Jellyfin Web player (in viewport height % / vh). Default is 5.0. Increase to move subtitles higher up into the video, or decrease if they appear too high.</div>
+                    </div>
+
                     <div>
                         <button is="emby-button" type="submit" class="raised button-submit block emby-button">
                             <span>Save</span>
@@ -63,6 +69,7 @@
                     if (mode === "Both") mode = "Auto";
                     $('#selectPlaybackMode', page).val(mode);
                     $('#txtMaxParallelScans', page).val(config.MaxParallelScans || 4);
+                    $('#txtSubtitleOffsetVh', page).val(config.SubtitleOffsetVh !== undefined ? config.SubtitleOffsetVh : 5.0);
                     Dashboard.hideLoadingMsg();
                 });
             });
@@ -77,6 +84,7 @@
                     config.CropDetectLimit = parseFloat($('#txtCropLimit', form).val());
                     config.PlaybackMode = $('#selectPlaybackMode', form).val();
                     config.MaxParallelScans = parseInt($('#txtMaxParallelScans', form).val(), 10) || 4;
+                    config.SubtitleOffsetVh = parseFloat($('#txtSubtitleOffsetVh', form).val());
                     
                     ApiClient.updatePluginConfiguration(BlackBarRemoverConfig.pluginUniqueId, config).then(function (result) {
                         Dashboard.processPluginConfigurationUpdateResult(result);

README.md

@@ -70,11 +70,13 @@ This plugin has been verified and tested on:
 1. Go to **Dashboard** -> **Plugins** -> **Black Bar Remover**.
 2. Set your **Crop Detect Limit** (Default is `0.094`). If your web-dl rips have noisy black bars that are not being cropped, increase this value to `0.15` or `0.20`.
 3. Set **Max Parallel Scans** (Default is `4`, Range `1 - 16`). Controls how many video files are scanned concurrently during library tasks to maximize multi-core CPU utilization.
-4. Select your preferred **Playback Mode**:
+4. Set **Client Subtitle Offset** (Default is `5.0 vh`, Range `0.0 - 25.0 vh`). Adjusts the vertical offset of subtitles when CSS crop is active in the Web player.
+5. Select your preferred **Playback Mode**:
    - `Auto`: Lightweight CSS clipping for Web browser DirectPlay; FFmpeg transcoding for native apps.
    - `Client`: Uses CSS injection in the web player.
    - `Server`: Requires setting up the FFmpeg wrapper.
-5. **Important for existing libraries**: The plugin automatically scans *new* files when they are added to Jellyfin. For your existing library, go to **Dashboard -> Scheduled Tasks** and run the **"Scan Missing Black Bars (Black Bar Remover)"** task manually. It will scan all existing movies and episodes in the background.
+6. **Live Subtitle Adjustment during Playback**: While watching a video in Jellyfin Web with CSS crop enabled, you can press **`Alt + ArrowUp`** or **`Alt + ArrowDown`** to adjust the subtitle vertical position on the fly in real-time with on-screen feedback!
+7. **Important for existing libraries**: The plugin automatically scans *new* files when they are added to Jellyfin. For your existing library, go to **Dashboard -> Scheduled Tasks** and run the **"Scan Missing Black Bars (Black Bar Remover)"** task manually. It will scan all existing movies and episodes in the background.
 
 ### Activating the Server-Side Wrapper (Automatic)