TAV: better initial q-index prediction for target bitrate mode

assets/disk0/tvdos/bin/playtav.js

@@ -2,9 +2,7 @@
 // TSVM Advanced Video (TAV) Format Decoder - DWT-based compression
 // Adapted from the working playtev.js decoder
 // Usage: playtav moviefile.tav [options]
-// Options: -i (interactive), -debug-mv (show motion vector debug visualization)
+// Options: -i (interactive)
-//          -deinterlace=algorithm (yadif or bwdif, default: yadif)
-//          -deblock (enable post-processing deblocking filter)
 
 const WIDTH = 560
 const HEIGHT = 448
@@ -70,7 +68,7 @@ let notifHideTimer = 0
 const NOTIF_SHOWUPTIME = 3000000000
 let [cy, cx] = con.getyx()
 
-//let playgui = require("playgui")
+let gui = require("playgui")
 let seqread = undefined
 let fullFilePathStr = fullFilePath.full
 
@@ -96,176 +94,9 @@ audio.purgeQueue(0)
 audio.setPcmMode(0)
 audio.setMasterVolume(0, 255)
 
-// Subtitle display functions
+// set colour zero as half-opaque black
-function clearSubtitleArea() {
+graphics.setPalette(0, 0, 0, 0, 9)
-    // Clear the subtitle area at the bottom of the screen
-    // Text mode is 80x32, so clear the bottom few lines
-    let oldFgColour = con.get_color_fore()
-    let oldBgColour = con.get_color_back()
 
-    con.color_pair(255, 255)  // transparent to clear
-
-    // Clear bottom 4 lines for subtitles
-    for (let row = 29; row <= 32; row++) {
-        con.move(row, 1)
-        for (let col = 1; col <= 80; col++) {
-            print(" ")
-        }
-    }
-
-    con.color_pair(oldFgColour, oldBgColour)
-}
-
-function getVisualLength(line) {
-    // Calculate the visual length of a line excluding formatting tags
-    let visualLength = 0
-    let i = 0
-
-    while (i < line.length) {
-        if (i < line.length - 2 && line[i] === '<') {
-            // Check for formatting tags and skip them
-            if (line.substring(i, i + 3).toLowerCase() === '<b>' ||
-                line.substring(i, i + 3).toLowerCase() === '<i>') {
-                i += 3  // Skip tag
-            } else if (i < line.length - 3 &&
-                      (line.substring(i, i + 4).toLowerCase() === '</b>' ||
-                       line.substring(i, i + 4).toLowerCase() === '</i>')) {
-                i += 4  // Skip closing tag
-            } else {
-                // Not a formatting tag, count the character
-                visualLength++
-                i++
-            }
-        } else {
-            // Regular character, count it
-            visualLength++
-            i++
-        }
-    }
-
-    return visualLength
-}
-
-function displayFormattedLine(line) {
-    // Parse line and handle <b> and <i> tags with colour changes
-    // Default subtitle colour: yellow (231), formatted text: white (254)
-
-    let i = 0
-    let inBoldOrItalic = false
-
-    // insert initial padding block
-    con.color_pair(0, 255)
-    con.prnch(0xDE)
-    con.color_pair(231, 0)
-
-    while (i < line.length) {
-        if (i < line.length - 2 && line[i] === '<') {
-            // Check for opening tags
-            if (line.substring(i, i + 3).toLowerCase() === '<b>' ||
-                line.substring(i, i + 3).toLowerCase() === '<i>') {
-                con.color_pair(254, 0)  // Switch to white for formatted text
-                inBoldOrItalic = true
-                i += 3
-            } else if (i < line.length - 3 &&
-                      (line.substring(i, i + 4).toLowerCase() === '</b>' ||
-                       line.substring(i, i + 4).toLowerCase() === '</i>')) {
-                con.color_pair(231, 0)  // Switch back to yellow for normal text
-                inBoldOrItalic = false
-                i += 4
-            } else {
-                // Not a formatting tag, print the character
-                print(line[i])
-                i++
-            }
-        } else {
-            // Regular character, print it
-            print(line[i])
-            i++
-        }
-    }
-
-    // insert final padding block
-    con.color_pair(0, 255)
-    con.prnch(0xDD)
-    con.color_pair(231, 0)
-}
-
-function displaySubtitle(text, position = 0) {
-    if (!text || text.length === 0) {
-        clearSubtitleArea()
-        return
-    }
-
-    // Set subtitle colours: yellow (231) on black (0)
-    let oldFgColour = con.get_color_fore()
-    let oldBgColour = con.get_color_back()
-    con.color_pair(231, 0)
-
-    // Split text into lines
-    let lines = text.split('\n')
-
-    // Calculate position based on subtitle position setting
-    let startRow, startCol
-    // Calculate visual length without formatting tags for positioning
-    let longestLineLength = lines.map(s => getVisualLength(s)).sort().last()
-
-    switch (position) {
-        case 2: // center left
-        case 6: // center right
-        case 8: // dead center
-            startRow = 16 - Math.floor(lines.length / 2)
-            break
-        case 3: // top left
-        case 4: // top center
-        case 5: // top right
-            startRow = 2
-            break
-        case 0: // bottom center
-        case 1: // bottom left
-        case 7: // bottom right
-        default:
-            startRow = 32 - lines.length
-            startRow = 32 - lines.length
-            startRow = 32 - lines.length  // Default to bottom center
-    }
-
-    // Display each line
-    for (let i = 0; i < lines.length; i++) {
-        let line = lines[i].trim()
-        if (line.length === 0) continue
-
-        let row = startRow + i
-        if (row < 1) row = 1
-        if (row > 32) row = 32
-
-        // Calculate column based on alignment
-        switch (position) {
-            case 1: // bottom left
-            case 2: // center left
-            case 3: // top left
-                startCol = 1
-                break
-            case 5: // top right
-            case 6: // center right
-            case 7: // bottom right
-                startCol = Math.max(1, 78 - getVisualLength(line) - 2)
-                break
-            case 0: // bottom center
-            case 4: // top center
-            case 8: // dead center
-            default:
-                startCol = Math.max(1, Math.floor((80 - longestLineLength - 2) / 2) + 1)
-                break
-        }
-
-        con.move(row, startCol)
-
-        // Parse and display line with formatting tag support
-        displayFormattedLine(line)
-    }
-
-    con.color_pair(oldFgColour, oldBgColour)
-}
 
 function processSubtitlePacket(packetSize) {
     // Read subtitle packet data according to SSF format
@@ -298,7 +129,7 @@ function processSubtitlePacket(packetSize) {
                 sys.free(textBytes)
                 subtitleText = textStr
                 subtitleVisible = true
-                displaySubtitle(subtitleText, subtitlePosition)
+                gui.displaySubtitle(subtitleText, subtitlePosition)
             }
             break
         }
@@ -306,7 +137,7 @@ function processSubtitlePacket(packetSize) {
         case SSF_OP_HIDE: {
             subtitleVisible = false
             subtitleText = ""
-            clearSubtitleArea()
+            gui.clearSubtitleArea()
             break
         }
 
@@ -320,8 +151,8 @@ function processSubtitlePacket(packetSize) {
 
                     // Re-display current subtitle at new position if visible
                     if (subtitleVisible && subtitleText.length > 0) {
-                        clearSubtitleArea()
+                        gui.clearSubtitleArea()
-                        displaySubtitle(subtitleText, subtitlePosition)
+                        gui.displaySubtitle(subtitleText, subtitlePosition)
                     }
                 }
             }
@@ -809,24 +640,15 @@ try {
         if (interactive) {
             notifHideTimer += (t2 - t1)
             if (!notifHidden && notifHideTimer > (NOTIF_SHOWUPTIME + FRAME_TIME)) {
-                con.move(1, 1)
+                // clearing function here
-                print(' '.repeat(79))
                 notifHidden = true
             }
 
-            if (!hasSubtitles) {
+            con.move(32, 1)
-                con.move(31, 1)
+            con.color_pair(253, 0)
-                con.color_pair(253, 0)
+            print(`B=${(getVideoRate() / 1024 * 8)|0}k F=${frameCount}/${header.totalFrames} qY=${decoderDbgInfo.qY} f=${(frameCount / akku2).toFixed(2)}`)
-                if (currentFileIndex > 1) {
+                con.color_pair(255, 255);print("     ")
-                    print(`File ${currentFileIndex}: ${frameCount}/${header.totalFrames} (qY=${decoderDbgInfo.qY}, ${((frameCount / akku2 * 100)|0) / 100}f)         `)
+            con.move(1, 1)
-                } else {
-                    print(`Frame: ${frameCount}/${header.totalFrames} (qY=${decoderDbgInfo.qY}, ${((frameCount / akku2 * 100)|0) / 100}f)         `)
-                }
-                con.move(32, 1)
-                con.color_pair(253, 0)
-                print(`VRate: ${(getVideoRate() / 1024 * 8)|0} kbps                               `)
-                con.move(1, 1)
-            }
         }
 
         t1 = t2

assets/disk0/tvdos/include/playgui.mjs

@@ -0,0 +1,178 @@
+// Common GUI for media player
+// Created by CuriousTorvald on 2025-09-30.
+
+// Subtitle display functions
+function clearSubtitleArea() {
+    // Clear the subtitle area at the bottom of the screen
+    // Text mode is 80x32, so clear the bottom few lines
+    let oldFgColour = con.get_color_fore()
+    let oldBgColour = con.get_color_back()
+
+    con.color_pair(255, 255)  // transparent to clear
+
+    // Clear bottom 4 lines for subtitles
+    for (let row = 28; row <= 31; row++) {
+        con.move(row, 1)
+        for (let col = 1; col <= 80; col++) {
+            print(" ")
+        }
+    }
+
+    con.color_pair(oldFgColour, oldBgColour)
+}
+
+function getVisualLength(line) {
+    // Calculate the visual length of a line excluding formatting tags
+    let visualLength = 0
+    let i = 0
+
+    while (i < line.length) {
+        if (i < line.length - 2 && line[i] === '<') {
+            // Check for formatting tags and skip them
+            if (line.substring(i, i + 3).toLowerCase() === '<b>' ||
+                line.substring(i, i + 3).toLowerCase() === '<i>') {
+                i += 3  // Skip tag
+            } else if (i < line.length - 3 &&
+                      (line.substring(i, i + 4).toLowerCase() === '</b>' ||
+                       line.substring(i, i + 4).toLowerCase() === '</i>')) {
+                i += 4  // Skip closing tag
+            } else {
+                // Not a formatting tag, count the character
+                visualLength++
+                i++
+            }
+        } else {
+            // Regular character, count it
+            visualLength++
+            i++
+        }
+    }
+
+    return visualLength
+}
+
+function displayFormattedLine(line) {
+    // Parse line and handle <b> and <i> tags with colour changes
+    // Default subtitle colour: yellow (231), formatted text: white (254)
+
+    let i = 0
+    let inBoldOrItalic = false
+
+    // insert initial padding block
+    con.color_pair(0, 255)
+    con.prnch(0xDE)
+    con.color_pair(231, 0)
+
+    while (i < line.length) {
+        if (i < line.length - 2 && line[i] === '<') {
+            // Check for opening tags
+            if (line.substring(i, i + 3).toLowerCase() === '<b>' ||
+                line.substring(i, i + 3).toLowerCase() === '<i>') {
+                con.color_pair(254, 0)  // Switch to white for formatted text
+                inBoldOrItalic = true
+                i += 3
+            } else if (i < line.length - 3 &&
+                      (line.substring(i, i + 4).toLowerCase() === '</b>' ||
+                       line.substring(i, i + 4).toLowerCase() === '</i>')) {
+                con.color_pair(231, 0)  // Switch back to yellow for normal text
+                inBoldOrItalic = false
+                i += 4
+            } else {
+                // Not a formatting tag, print the character
+                print(line[i])
+                i++
+            }
+        } else {
+            // Regular character, print it
+            print(line[i])
+            i++
+        }
+    }
+
+    // insert final padding block
+    con.color_pair(0, 255)
+    con.prnch(0xDD)
+    con.color_pair(231, 0)
+}
+
+function displaySubtitle(text, position = 0) {
+    if (!text || text.length === 0) {
+        clearSubtitleArea()
+        return
+    }
+
+    // Set subtitle colours: yellow (231) on black (0)
+    let oldFgColour = con.get_color_fore()
+    let oldBgColour = con.get_color_back()
+    con.color_pair(231, 0)
+
+    // Split text into lines
+    let lines = text.split('\n')
+
+    // Calculate position based on subtitle position setting
+    let startRow, startCol
+    // Calculate visual length without formatting tags for positioning
+    let longestLineLength = lines.map(s => getVisualLength(s)).sort().last()
+
+    switch (position) {
+        case 2: // center left
+        case 6: // center right
+        case 8: // dead center
+            startRow = 16 - Math.floor(lines.length / 2)
+            break
+        case 3: // top left
+        case 4: // top center
+        case 5: // top right
+            startRow = 2
+            break
+        case 0: // bottom center
+        case 1: // bottom left
+        case 7: // bottom right
+        default:
+            startRow = 31 - lines.length
+            startRow = 31 - lines.length
+            startRow = 31 - lines.length  // Default to bottom center
+    }
+
+    // Display each line
+    for (let i = 0; i < lines.length; i++) {
+        let line = lines[i].trim()
+        if (line.length === 0) continue
+
+        let row = startRow + i
+        if (row < 1) row = 1
+        if (row > 32) row = 32
+
+        // Calculate column based on alignment
+        switch (position) {
+            case 1: // bottom left
+            case 2: // center left
+            case 3: // top left
+                startCol = 1
+                break
+            case 5: // top right
+            case 6: // center right
+            case 7: // bottom right
+                startCol = Math.max(1, 78 - getVisualLength(line) - 2)
+                break
+            case 0: // bottom center
+            case 4: // top center
+            case 8: // dead center
+            default:
+                startCol = Math.max(1, Math.floor((80 - longestLineLength - 2) / 2) + 1)
+                break
+        }
+
+        con.move(row, startCol)
+
+        // Parse and display line with formatting tag support
+        displayFormattedLine(line)
+    }
+
+    con.color_pair(oldFgColour, oldBgColour)
+}
+
+exports = {
+    clearSubtitleArea,
+    displaySubtitle
+}

video_encoder/encoder_tav.c

@@ -3219,15 +3219,15 @@ int main(int argc, char *argv[]) {
                 enc->target_bitrate = bitrate;
 
                 // Choose initial q-index based on target bitrate
-                if (bitrate >= 64000) {
+                if (bitrate >= 32000) {
                     enc->quality_level = 5;
-                } else if (bitrate >= 32000) {
-                    enc->quality_level = 4;
                 } else if (bitrate >= 16000) {
-                    enc->quality_level = 3;
+                    enc->quality_level = 4;
                 } else if (bitrate >= 8000) {
-                    enc->quality_level = 2;
+                    enc->quality_level = 3;
                 } else if (bitrate >= 4000) {
+                    enc->quality_level = 2;
+                } else if (bitrate >= 2000) {
                     enc->quality_level = 1;
                 } else {
                     enc->quality_level = 0;