From eeb3ca5927e186fa15025b6e93cf4b071f3ecd1f Mon Sep 17 00:00:00 2001
From: evgeny <evgeny@adaptto.ru>
Date: Thu, 15 Oct 2026 01:26:35 +0200
Subject: [PATCH] Avoid uncached per-pixel chroma writes in codec probe

---
 .../java/com/utun/chat/data/CallVideoProbe.kt    | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/tools/chatgui-android/app/src/debug/java/com/utun/chat/data/CallVideoProbe.kt b/tools/chatgui-android/app/src/debug/java/com/utun/chat/data/CallVideoProbe.kt
index 7a4a1b93..fc5c4e56 100644
--- a/tools/chatgui-android/app/src/debug/java/com/utun/chat/data/CallVideoProbe.kt
+++ b/tools/chatgui-android/app/src/debug/java/com/utun/chat/data/CallVideoProbe.kt
@@ -59,7 +59,7 @@ class CallVideoProbe : Instrumentation() {
                             check(encoder.setBitrate(rate)) { "In-place bitrate unsupported: $name" }
                             var input = 0; var output = 0; var bytes = 0L; var prepared = false; var key = false
                             val base = 10_000_000L + phase * 4_000_000L
-                            val deadline = System.nanoTime() + 15_000_000_000L
+                            val started = System.nanoTime(); val deadline = started + 30_000_000_000L
                             while (output < 120 && System.nanoTime() < deadline) {
                                 if (input < 120) {
                                     if (!prepared) { random = fillNoise(image, random); prepared = true }
@@ -76,7 +76,8 @@ class CallVideoProbe : Instrumentation() {
                                 Thread.sleep(2)
                             }
                             val measured = bytes * 8 / 2
-                            val result = "name=$name phase=$phase target=$rate measured=$measured input=$input output=$output key=$key"
+                            val result = "name=$name phase=$phase target=$rate measured=$measured input=$input output=$output key=$key " +
+                                "elapsed_ms=${(System.nanoTime() - started) / 1_000_000}"
                             android.util.Log.i("CallVideoProbe", "rate check $result")
                             check(input == 120 && output == 120 && key) { "Incomplete rate check: $result" }
                             check(measured > rate / 2 && measured < rate.toLong() * 3 / 2) { "Bitrate change ineffective: $result" }
@@ -92,15 +93,16 @@ class CallVideoProbe : Instrumentation() {
         for ((index, plane) in image.planes.withIndex()) {
             val width = image.width shr (if (index == 0) 0 else 1)
             val height = image.height shr (if (index == 0) 0 else 1)
-            val buffer = plane.buffer.duplicate(); val start = buffer.position(); val row = ByteArray(width) { 128.toByte() }
+            val buffer = plane.buffer.duplicate(); val start = buffer.position()
+            val row = ByteArray((width - 1) * plane.pixelStride + 1) { 128.toByte() }
             for (y in 0 until height) {
-                // Ограниченный контраст: полностью случайный 8-bit шум превышает возможности аппаратного CBR даже при QP=51.
+                // Ограниченный контраст сохраняет сжимаемость тестового сигнала при низком bitrate.
                 if (index == 0) for (x in 0 until width) {
-                    random = random * 1664525 + 1013904223; row[x] = (112 + (random ushr 27)).toByte()
+                    random = random * 1664525 + 1013904223; row[x * plane.pixelStride] = (112 + (random ushr 27)).toByte()
                 }
                 val offset = start + y * plane.rowStride
-                if (plane.pixelStride == 1) { buffer.position(offset); buffer.put(row) }
-                else for (x in 0 until width) buffer.put(offset + x * plane.pixelStride, row[x])
+                // Обе chroma-плоскости нейтральны: interleaved U/V тоже заполняем одним bulk put.
+                buffer.position(offset); buffer.put(row)
             }
         }
         return random