major remote desktop upgrades + do opus. Hopefully all the tests pass 😭

Overlord-Client/cmd/agent/capture/h264_bitrate.go

@@ -0,0 +1,66 @@
+package capture
+
+import (
+	"math"
+	"sync/atomic"
+)
+
+const maxH264Bitrate = 50_000_000
+
+var h264TargetBitrate atomic.Int64
+
+func SetH264TargetBitrate(bps int) int {
+	if bps < 0 {
+		bps = 0
+	}
+	if bps > maxH264Bitrate {
+		bps = maxH264Bitrate
+	}
+	previous := h264TargetBitrate.Swap(int64(bps))
+	if previous != int64(bps) {
+		resetH264Encoder()
+		resetH264Encoderbackstage()
+		resetH264TextureEncoderForBitrate()
+		RequestDesktopFullFrame()
+	}
+	return bps
+}
+
+func configuredH264Bitrate() int {
+	return int(h264TargetBitrate.Load())
+}
+
+func automaticH264Bitrate(width, height, fps int) int {
+	pixelsPerSecond := float64(width * height * fps)
+	bitrate := int(pixelsPerSecond * 0.08)
+	if bitrate < 1_500_000 {
+		return 1_500_000
+	}
+	if bitrate > 18_000_000 {
+		return 18_000_000
+	}
+	return bitrate
+}
+
+func targetH264Bitrate(width, height, fps int) int {
+	if configured := configuredH264Bitrate(); configured > 0 {
+		return configured
+	}
+	return automaticH264Bitrate(width, height, fps)
+}
+
+func targetH264CRF(width, height, fps int) float32 {
+	configured := configuredH264Bitrate()
+	if configured <= 0 {
+		return 23
+	}
+	ratio := float64(configured) / float64(automaticH264Bitrate(width, height, fps))
+	crf := 23 - 6*math.Log2(ratio)
+	if crf < 12 {
+		crf = 12
+	}
+	if crf > 35 {
+		crf = 35
+	}
+	return float32(crf)
+}