From e705d274de64642d77f0c919c7ecdc649b9572f0 Mon Sep 17 00:00:00 2001
From: minjaesong <alswo9628@gmail.com>
Date: Mon, 13 Oct 2025 01:42:44 +0900
Subject: [PATCH] TAV decoding minor changes

---
 assets/disk0/tvdos/bin/playtav.js                   | 13 +------------
 terranmon.txt                                       |  4 +++-
 .../src/net/torvald/tsvm/GraphicsJSR223Delegate.kt  |  6 +++---
 3 files changed, 7 insertions(+), 16 deletions(-)

diff --git a/assets/disk0/tvdos/bin/playtav.js b/assets/disk0/tvdos/bin/playtav.js
index 53b728b..28b3165 100644
--- a/assets/disk0/tvdos/bin/playtav.js
+++ b/assets/disk0/tvdos/bin/playtav.js
@@ -53,7 +53,6 @@ let subtitlePosition = 0  // 0=bottom center (default)
 
 // Parse command line options
 let interactive = false
-let userDefinedFilmGrain = false
 let filmGrainLevel = null
 
 if (exec_args.length > 2) {
@@ -69,7 +68,6 @@ if (exec_args.length > 2) {
                 const level = parseInt(parts[1])
                 if (!isNaN(level) && level >= 1 && level <= 32767) {
                     filmGrainLevel = level
-                    userDefinedFilmGrain = true
                 }
             }
             // Try next argument if no '=' found
@@ -77,7 +75,6 @@ if (exec_args.length > 2) {
                 const level = parseInt(exec_args[i + 1])
                 if (!isNaN(level) && level >= 1 && level <= 32767) {
                     filmGrainLevel = level
-                    userDefinedFilmGrain = true
                     i++ // Skip next arg
                 }
             }
@@ -298,13 +295,6 @@ if (header.version < 1 || header.version > 8) {
     return
 }
 
-function setFilmGrainLevel(header) {
-    // decide film grain strength by quality level
-    filmGrainLevel = [9,6,-4,3,-2,-2,-2][header.qualityLevel - 1]
-}
-
-setFilmGrainLevel(header)
-
 // Helper function to decode channel layout name
 function getChannelLayoutName(layout) {
     switch (layout) {
@@ -846,7 +836,6 @@ try {
                         currentCueIndex++
                     }
                     totalFilesProcessed++
-                    setFilmGrainLevel(header)
 
                     console.log(`\nStarting file ${currentFileIndex}:`)
                     console.log(`Resolution: ${header.width}x${header.height}`)
@@ -908,8 +897,8 @@ try {
                         serial.println(`  FIELD_SIZE: ${FIELD_SIZE}`)
                     }
 
-                    //let thisFrameNoiseLevel = (filmGrainLevel >= 0) ? filmGrainLevel : -(filmGrainLevel - (trueFrameCount % 2))
                     // grain synthesis is now part of the spec
+                    // TODO if filmGrainLevel != null, user requested custom film grain level
 
                     // Call new TAV hardware decoder that handles Zstd decompression internally
                     // Note: No longer using JS gzip.decompFromTo - Kotlin handles Zstd natively
diff --git a/terranmon.txt b/terranmon.txt
index 2b318a2..283e47d 100644
--- a/terranmon.txt
+++ b/terranmon.txt
@@ -943,6 +943,7 @@ transmission capability, and region-of-interest coding.
     *      Payload
 
 ## Packet Types
+    <video packets>
     0x10: I-frame (intra-coded frame)
     0x11: P-frame (delta/skip frame)
     0x1F: (prohibited)
@@ -965,7 +966,8 @@ transmission capability, and region-of-interest coding.
     0xE2: ID3v2 packet
     0xE3: Vorbis Comment packet
     0xE4: CD-text packet
-    <End of Standard metadata>
+    <Special packets>
+    0x00: No-op
     0xF0: Loop point start
     0xF1: Loop point end
     0xFE: NTSC sync packet (used by player to calculate exact framerate-wise performance)
diff --git a/tsvm_core/src/net/torvald/tsvm/GraphicsJSR223Delegate.kt b/tsvm_core/src/net/torvald/tsvm/GraphicsJSR223Delegate.kt
index a534887..803be96 100644
--- a/tsvm_core/src/net/torvald/tsvm/GraphicsJSR223Delegate.kt
+++ b/tsvm_core/src/net/torvald/tsvm/GraphicsJSR223Delegate.kt
@@ -4504,11 +4504,11 @@ class GraphicsJSR223Delegate(private val vm: VM) {
                 getPerceptualWeight(qIndex, qYGlobal, subband.level, subband.subbandType, false, decompLevels)
             } else {
                 1.0f
-            }
+            }*/
 
             // Noise amplitude for this subband
-            val noiseAmplitude = (quantiser * perceptualWeight) * 0.5f*/
-            val noiseAmplitude = quantiser.coerceAtMost(32f) * 0.5f
+//            val noiseAmplitude = quantiser.coerceAtMost(32f) * 0.5f
+            val noiseAmplitude = qYGlobal.coerceAtMost(32) * 0.5f // using qYGlobal because quantiser is variable on bitrate-control mode and varying grain amp annoys viewer
 
             // Remove noise from each coefficient in this subband
             for (i in 0 until subband.coeffCount) {