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Avoid uncached per-pixel chroma writes in codec probe

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evgeny committed 2026-10-15 01:26:35 +02:00
1 parent 5e22da3098
commit eeb3ca5927
1 file changed
+9 -7
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tools/chatgui-android/app/src/debug/java/com/utun/chat/data/CallVideoProbe.kt
+9 -7
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@@ -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