install go2rtc on bob

installs_on_host/go2rtc/internal/ffmpeg/jpeg.go

@@ -0,0 +1,83 @@
+package ffmpeg
+
+import (
+	"bytes"
+	"fmt"
+	"net/url"
+	"os/exec"
+
+	"github.com/AlexxIT/go2rtc/internal/ffmpeg/hardware"
+	"github.com/AlexxIT/go2rtc/pkg/core"
+	"github.com/AlexxIT/go2rtc/pkg/ffmpeg"
+	"github.com/AlexxIT/go2rtc/pkg/shell"
+)
+
+func JPEGWithQuery(b []byte, query url.Values) ([]byte, error) {
+	args := parseQuery(query)
+	return transcode(b, args.String())
+}
+
+func JPEGWithScale(b []byte, width, height int) ([]byte, error) {
+	args := defaultArgs()
+	args.AddFilter(fmt.Sprintf("scale=%d:%d", width, height))
+	return transcode(b, args.String())
+}
+
+func transcode(b []byte, args string) ([]byte, error) {
+	cmdArgs := shell.QuoteSplit(args)
+	cmd := exec.Command(cmdArgs[0], cmdArgs[1:]...)
+	cmd.Stdin = bytes.NewBuffer(b)
+	return cmd.Output()
+}
+
+func defaultArgs() *ffmpeg.Args {
+	return &ffmpeg.Args{
+		Bin:    defaults["bin"],
+		Global: defaults["global"],
+		Input:  "-i -",
+		Codecs: []string{defaults["mjpeg"]},
+		Output: defaults["output/mjpeg"],
+	}
+}
+
+func parseQuery(query url.Values) *ffmpeg.Args {
+	args := defaultArgs()
+
+	var width = -1
+	var height = -1
+	var r, hw string
+
+	for k, v := range query {
+		switch k {
+		case "width", "w":
+			width = core.Atoi(v[0])
+		case "height", "h":
+			height = core.Atoi(v[0])
+		case "rotate":
+			r = v[0]
+		case "hardware", "hw":
+			hw = v[0]
+		}
+	}
+
+	if width > 0 || height > 0 {
+		args.AddFilter(fmt.Sprintf("scale=%d:%d", width, height))
+	}
+
+	if r != "" {
+		switch r {
+		case "90":
+			args.AddFilter("transpose=1") // 90 degrees clockwise
+		case "180":
+			args.AddFilter("transpose=1,transpose=1")
+		case "-90", "270":
+			args.AddFilter("transpose=2") // 90 degrees counterclockwise
+		}
+	}
+
+	if hw != "" {
+		hardware.MakeHardware(args, hw, defaults)
+	}
+
+	return args
+}