add h264. Should hopefully be good for now. not going to push docker build until fully tested.

Overlord-Client/cmd/agent/capture/h264_encoder_x264.go

@@ -0,0 +1,89 @@
+//go:build cgo
+
+package capture
+
+import (
+	"bytes"
+	"image"
+	"sync"
+
+	x264 "github.com/gen2brain/x264-go"
+)
+
+var (
+	h264Mu     sync.Mutex
+	h264Enc    *x264.Encoder
+	h264Buf    bytes.Buffer
+	h264Width  int
+	h264Height int
+)
+
+func encodeH264Frame(img *image.RGBA) ([]byte, error) {
+	bounds := img.Bounds()
+	width := bounds.Dx()
+	height := bounds.Dy()
+
+	h264Mu.Lock()
+	defer h264Mu.Unlock()
+
+	if err := ensureH264EncoderLocked(width, height); err != nil {
+		return nil, err
+	}
+
+	h264Buf.Reset()
+	if err := h264Enc.Encode(img); err != nil {
+		return nil, err
+	}
+
+	out := make([]byte, h264Buf.Len())
+	copy(out, h264Buf.Bytes())
+	return out, nil
+}
+
+func h264Available() bool {
+	return true
+}
+
+func ensureH264EncoderLocked(width, height int) error {
+	if h264Enc != nil && h264Width == width && h264Height == height {
+		return nil
+	}
+
+	closeH264EncoderLocked()
+
+	opts := &x264.Options{
+		Width:     width,
+		Height:    height,
+		FrameRate: 25,
+		Tune:      "zerolatency",
+		Preset:    "ultrafast",
+		Profile:   "baseline",
+		LogLevel:  x264.LogError,
+	}
+
+	enc, err := x264.NewEncoder(&h264Buf, opts)
+	if err != nil {
+		return err
+	}
+
+	h264Enc = enc
+	h264Width = width
+	h264Height = height
+	return nil
+}
+
+func resetH264Encoder() {
+	h264Mu.Lock()
+	defer h264Mu.Unlock()
+	closeH264EncoderLocked()
+}
+
+func closeH264EncoderLocked() {
+	if h264Enc != nil {
+		_ = h264Enc.Close()
+		h264Enc = nil
+	}
+	h264Width = 0
+	h264Height = 0
+	h264Buf.Reset()
+}