rpi: embed libcamera and libfreetype into the server (#2581)

README.md

@@ -471,20 +471,20 @@ The resulting stream will be available in path `/cam`.
 
 _MediaMTX_ natively supports the Raspberry Pi Camera, enabling high-quality and low-latency video streaming from the camera to any user, for any purpose. There are a couple of requirements:
 
-1. The server must run on a Raspberry Pi, with Raspberry Pi OS Bullseye as operative system. Both 32 bit and 64 bit architectures are supported.
+1. The server must run on a Raspberry Pi, with one of the following operating systems:
 
-2. Make sure that the legacy camera stack is disabled. Type `sudo raspi-config`, then go to `Interfacing options`, `enable/disable legacy camera support`, choose `no`. Reboot the system.
+   * Raspberry Pi OS Bookworm
+   * Raspberry Pi OS Bullseye
 
-If you want to run the standard (non-Docker) version of the server:
+   Both 32 bit and 64 bit architectures are supported.
 
-1. Make sure that the following packages are installed:
+2. If you are using Raspberry Pi OS Bullseye, make sure that the legacy camera stack is disabled. Type `sudo raspi-config`, then go to `Interfacing options`, `enable/disable legacy camera support`, choose `no`. Reboot the system.
 
-   * `libcamera0` (≥ 0.0.5)
-   * `libfreetype6`
+If you want to run the standard (non-Docker) version of the server:
 
-2. download the server executable. If you're using 64-bit version of the operative system, make sure to pick the `arm64` variant.
+1. Download the server executable. If you're using 64-bit version of the operative system, make sure to pick the `arm64` variant.
 
-3. edit `mediamtx.yml` and replace everything inside section `paths` with the following content:
+2. Edit `mediamtx.yml` and replace everything inside section `paths` with the following content:
 
    ```yml
    paths:
@@ -494,7 +494,7 @@ If you want to run the standard (non-Docker) version of the server:
 
 The resulting stream will be available in path `/cam`.
 
-If you want to run the server inside Docker, you need to use the `latest-rpi` image (that already contains required libraries) and launch the container with some additional flags:
+If you want to run the server inside Docker, you need to use the `latest-rpi` image and launch the container with some additional flags:
 
 ```sh
 docker run --rm -it \
@@ -506,7 +506,7 @@ docker run --rm -it \
 bluenviron/mediamtx:latest-rpi
 ```
 
-Be aware that the Docker image is not compatible with cameras that requires a custom `libcamera` (like some ArduCam products), since it comes with a standard `libcamera` included.
+Be aware that the server is not compatible with cameras that requires a custom `libcamera` (like some ArduCam products), since it comes with a bundled `libcamera`. If you want to use a custom one, you can [compile from source](#compile-from-source).
 
 Camera settings can be changed by using the `rpiCamera*` parameters:
 

internal/staticsources/rpicamera/camera.go

@@ -4,109 +4,16 @@
 package rpicamera
 
 import (
-	"debug/elf"
 	"fmt"
 	"os"
 	"os/exec"
-	"runtime"
+	"path/filepath"
 	"strconv"
-	"strings"
-	"sync"
 	"time"
 
 	"github.com/bluenviron/mediacommon/pkg/codecs/h264"
 )
 
-const (
-	tempPathPrefix = "/dev/shm/mediamtx-rpicamera-"
-)
-
-func startEmbeddedExe(content []byte, env []string) (*exec.Cmd, error) {
-	tempPath := tempPathPrefix + strconv.FormatInt(time.Now().UnixNano(), 10)
-
-	err := os.WriteFile(tempPath, content, 0o755)
-	if err != nil {
-		return nil, err
-	}
-
-	cmd := exec.Command(tempPath)
-	cmd.Stdout = os.Stdout
-	cmd.Stderr = os.Stderr
-	cmd.Env = env
-
-	err = cmd.Start()
-	os.Remove(tempPath)
-
-	if err != nil {
-		return nil, err
-	}
-
-	return cmd, nil
-}
-
-func findLibrary(name string) (string, error) {
-	byts, err := exec.Command("ldconfig", "-p").Output()
-	if err == nil {
-		for _, line := range strings.Split(string(byts), "\n") {
-			f := strings.Split(line, " => ")
-			if len(f) == 2 && strings.Contains(f[1], name+".so") {
-				return f[1], nil
-			}
-		}
-	}
-
-	return "", fmt.Errorf("library '%s' not found", name)
-}
-
-func check64bit(fpath string) error {
-	f, err := os.Open(fpath)
-	if err != nil {
-		return err
-	}
-	defer f.Close()
-
-	ef, err := elf.NewFile(f)
-	if err != nil {
-		return err
-	}
-	defer ef.Close()
-
-	if ef.FileHeader.Class == elf.ELFCLASS64 {
-		return fmt.Errorf("libcamera is 64-bit, you need the 64-bit server version")
-	}
-
-	return nil
-}
-
-var (
-	mutex   sync.Mutex
-	checked bool
-)
-
-func checkLibraries64Bit() error {
-	mutex.Lock()
-	defer mutex.Unlock()
-
-	if checked {
-		return nil
-	}
-
-	for _, name := range []string{"libcamera", "libcamera-base"} {
-		lib, err := findLibrary(name)
-		if err != nil {
-			return err
-		}
-
-		err = check64bit(lib)
-		if err != nil {
-			return err
-		}
-	}
-
-	checked = true
-	return nil
-}
-
 type camera struct {
 	Params params
 	OnData func(time.Duration, [][]byte)
@@ -120,34 +27,41 @@ type camera struct {
 }
 
 func (c *camera) initialize() error {
-	if runtime.GOARCH == "arm" {
-		err := checkLibraries64Bit()
-		if err != nil {
-			return err
-		}
+	err := dumpComponent()
+	if err != nil {
+		return err
 	}
 
-	var err error
 	c.pipeConf, err = newPipe()
 	if err != nil {
+		freeComponent()
 		return err
 	}
 
 	c.pipeVideo, err = newPipe()
 	if err != nil {
 		c.pipeConf.close()
+		freeComponent()
 		return err
 	}
 
 	env := []string{
 		"PIPE_CONF_FD=" + strconv.FormatInt(int64(c.pipeConf.readFD), 10),
 		"PIPE_VIDEO_FD=" + strconv.FormatInt(int64(c.pipeVideo.writeFD), 10),
+		"LD_LIBRARY_PATH=" + dumpPath,
 	}
 
-	c.cmd, err = startEmbeddedExe(component, env)
+	c.cmd = exec.Command(filepath.Join(dumpPath, "exe"))
+	c.cmd.Stdout = os.Stdout
+	c.cmd.Stderr = os.Stderr
+	c.cmd.Env = env
+	c.cmd.Dir = dumpPath
+
+	err = c.cmd.Start()
 	if err != nil {
 		c.pipeConf.close()
 		c.pipeVideo.close()
+		freeComponent()
 		return err
 	}
 
@@ -164,18 +78,20 @@ func (c *camera) initialize() error {
 	}()
 
 	select {
-	case <-c.waitDone:
+	case err := <-c.waitDone:
 		c.pipeConf.close()
 		c.pipeVideo.close()
 		<-c.readerDone
-		return fmt.Errorf("process exited unexpectedly")
+		freeComponent()
+		return fmt.Errorf("process exited unexpectedly: %v", err)
 
 	case err := <-c.readerDone:
 		if err != nil {
 			c.pipeConf.write([]byte{'e'})
 			<-c.waitDone
 			c.pipeConf.close()
 			c.pipeVideo.close()
+			freeComponent()
 			return err
 		}
 	}
@@ -194,6 +110,7 @@ func (c *camera) close() {
 	c.pipeConf.close()
 	c.pipeVideo.close()
 	<-c.readerDone
+	freeComponent()
 }
 
 func (c *camera) reloadParams(params params) {

internal/staticsources/rpicamera/component.go

@@ -1,3 +1,107 @@
+//go:build (linux && arm) || (linux && arm64)
+// +build linux,arm linux,arm64
+
 package rpicamera
 
+import (
+	"os"
+	"path/filepath"
+	"strconv"
+	"sync"
+	"time"
+)
+
 //go:generate go run ./mtxrpicamdownloader
+
+const (
+	dumpPrefix = "/dev/shm/mediamtx-rpicamera-"
+)
+
+var (
+	dumpMutex sync.Mutex
+	dumpCount = 0
+	dumpPath  = ""
+)
+
+func dumpEmbedFSRecursive(src string, dest string) error {
+	files, err := component.ReadDir(src)
+	if err != nil {
+		return err
+	}
+
+	for _, f := range files {
+		if f.IsDir() {
+			err = os.Mkdir(filepath.Join(dest, f.Name()), 0o755)
+			if err != nil {
+				return err
+			}
+
+			err = dumpEmbedFSRecursive(filepath.Join(src, f.Name()), filepath.Join(dest, f.Name()))
+			if err != nil {
+				return err
+			}
+		} else {
+			buf, err := component.ReadFile(filepath.Join(src, f.Name()))
+			if err != nil {
+				return err
+			}
+
+			err = os.WriteFile(filepath.Join(dest, f.Name()), buf, 0o644)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
+func dumpComponent() error {
+	dumpMutex.Lock()
+	defer dumpMutex.Unlock()
+
+	if dumpCount > 0 {
+		dumpCount++
+		return nil
+	}
+
+	dumpPath = dumpPrefix + strconv.FormatInt(time.Now().UnixNano(), 10)
+
+	err := os.Mkdir(dumpPath, 0o755)
+	if err != nil {
+		return err
+	}
+
+	files, err := component.ReadDir(".")
+	if err != nil {
+		os.RemoveAll(dumpPath)
+		return err
+	}
+
+	err = dumpEmbedFSRecursive(files[0].Name(), dumpPath)
+	if err != nil {
+		os.RemoveAll(dumpPath)
+		return err
+	}
+
+	err = os.Chmod(filepath.Join(dumpPath, "exe"), 0o755)
+	if err != nil {
+		os.RemoveAll(dumpPath)
+		return err
+	}
+
+	dumpCount++
+
+	return nil
+}
+
+func freeComponent() {
+	dumpMutex.Lock()
+	defer dumpMutex.Unlock()
+
+	dumpCount--
+
+	if dumpCount == 0 {
+		os.RemoveAll(dumpPath)
+	}
+}

internal/staticsources/rpicamera/component_32.go

@@ -4,8 +4,8 @@
 package rpicamera
 
 import (
-	_ "embed"
+	"embed"
 )
 
-//go:embed mtxrpicam_32
-var component []byte
+//go:embed mtxrpicam_32/*
+var component embed.FS

internal/staticsources/rpicamera/component_64.go

@@ -4,8 +4,8 @@
 package rpicamera
 
 import (
-	_ "embed"
+	"embed"
 )
 
-//go:embed mtxrpicam_64
-var component []byte
+//go:embed mtxrpicam_64/*
+var component embed.FS

internal/staticsources/rpicamera/component_dl.go

@@ -0,0 +1,3 @@
+package rpicamera
+
+//go:generate go run ./mtxrpicamdownloader

internal/staticsources/rpicamera/mtxrpicamdownloader/VERSION

@@ -1 +1 @@
-v1.0.0
+v2.0.0