Function main

rustcv-backend-avf/examples/camera_view.rs:40–167

()

#[cfg(target_os = "macos")]
#[tokio::main]
async fn main() -> Result<()> {
    println!("=== RustCV AVFoundation Backend Demo ===");

    // ── 步骤 1：实例化驱动 ──────────────────────────────────────────────
    let driver = AvfDriver::new();

    // ── 步骤 2：枚举并打印设备列表 ─────────────────────────────────────
    let devices = driver.list_devices()?;
    if devices.is_empty() {
        anyhow::bail!("No cameras found! Please connect a camera.");
    }

    println!("Found {} device(s):", devices.len());
    for (i, dev) in devices.iter().enumerate() {
        println!("  [{}] {} (id: {})", i, dev.name, dev.id,);
    }

    // 默认使用第一个设备
    let target = &devices[0];
    println!("\nOpening device: {}", target.name);

    let width: usize = 640;
    let height: usize = 480;

    // ── 步骤 3：构建采集配置 ────────────────────────────────────────────
    // macOS AVFoundation 返回 32BGRA 格式，直接对接 minifb 最高效。
    // Priority::Required 强制要求分辨率，fps 和 format 作为偏好请求。
    let config = CameraConfig::new()
        .resolution(width as u32, height as u32, Priority::Required)
        .fps(30, Priority::High)
        .format(FourCC::new(b'B', b'G', b'R', b'A'), Priority::High);

    // ── 步骤 4：打开设备，获取 Stream 和 Controls ─────────────────────
    let (mut stream, _controls) = driver
        .open(&target.id, config)
        .context("Failed to open camera device")?;

    // ── 步骤 5：启动流 ─────────────────────────────────────────────────
    stream.start().await.context("Failed to start stream")?;
    println!("Stream started! Press ESC to exit.");

    // ── 创建 minifb 窗口 ───────────────────────────────────────────────
    let mut window = Window::new(
        "RustCV AVF — Camera Preview (ESC to quit)",
        width,
        height,
        WindowOptions::default(),
    )
    .context("Failed to create window")?;

    // minifb 0.24 上允许设置最大帧率（避免 CPU 空转）
    window.limit_update_rate(Some(std::time::Duration::from_micros(33_333))); // ~30fps

    // ── FPS 计量 ───────────────────────────────────────────────────────
    let mut last_fps_time = Instant::now();
    let mut frame_count: u32 = 0;
    let mut display_fps: f64 = 0.0;