yituo_video/src/rtsp_manager.cpp

// rtsp_manager.cpp
#include "rtsp_manager.hpp"

#include <fcntl.h>
#include <linux/videodev2.h>
#include <sys/ioctl.h>

#include <algorithm>
#include <chrono>
#include <iostream>
#include <thread>
#include <unordered_map>

#include "logger.hpp"

// 静态变量定义
GMainLoop* RTSPManager::loop = nullptr;
GMainContext* RTSPManager::main_context = nullptr;
GstRTSPServer* RTSPManager::server = nullptr;

std::unordered_map<std::string, bool> RTSPManager::streaming_status;
std::unordered_map<std::string, GstRTSPMediaFactory*> RTSPManager::mounted_factories;
std::mutex RTSPManager::mounted_factories_mutex;

// ==============================
// ✅ 不再保存 GstRTSPMedia* 裸指针
// 改为：每路 camera 的“活跃 session 计数”
// ==============================
static std::unordered_map<std::string, int> g_client_count;
static std::mutex g_client_count_mutex;

// 日志降噪：media-configure 过于频繁时只提示
static std::unordered_map<std::string, std::chrono::steady_clock::time_point> last_media_ts;
static std::mutex last_media_ts_mutex;

bool set_v4l2_format(const std::string& dev, int width, int height)
{
    int fd = open(dev.c_str(), O_RDWR);
    if (fd < 0)
    {
        LOG_ERROR("Failed to open " + dev);
        return false;
    }

    struct v4l2_format fmt;
    memset(&fmt, 0, sizeof(fmt));
    fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;

    // 读格式，若相同则略过
    if (ioctl(fd, VIDIOC_G_FMT, &fmt) == 0)
    {
        bool match = true;
        if (fmt.fmt.pix_mp.width != (unsigned int)width || fmt.fmt.pix_mp.height != (unsigned int)height ||
            fmt.fmt.pix_mp.pixelformat != V4L2_PIX_FMT_NV12)
        {
            match = false;
        }

        if (match)
        {
            close(fd);
            LOG_INFO("[RTSP] V4L2 format already NV12 " + std::to_string(width) + "x" + std::to_string(height) +
                     " for " + dev);
            return true;
        }
    }

    memset(&fmt, 0, sizeof(fmt));
    fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
    fmt.fmt.pix_mp.width = width;
    fmt.fmt.pix_mp.height = height;
    fmt.fmt.pix_mp.pixelformat = V4L2_PIX_FMT_NV12;
    fmt.fmt.pix_mp.num_planes = 1;

    if (ioctl(fd, VIDIOC_S_FMT, &fmt) < 0)
    {
        LOG_ERROR("VIDIOC_S_FMT failed for " + dev);
        close(fd);
        return false;
    }

    LOG_INFO("[RTSP] Set V4L2 format to NV12 " + std::to_string(width) + "x" + std::to_string(height) + " for " + dev);
    close(fd);
    return true;
}

void RTSPManager::init()
{
    gst_init(nullptr, nullptr);
    LOG_INFO("[RTSP] GStreamer initialized.");
}

GstRTSPMediaFactory* RTSPManager::create_media_factory(const Camera& cam)
{
    // 启动前把 v4l2 格式设成我们想要的
    set_v4l2_format(cam.device, cam.width, cam.height);

    int w = cam.width;
    int h = cam.height;

    std::string caps =
        "video/x-raw,format=NV12,"
        "width=" +
        std::to_string(w) + ",height=" + std::to_string(h) + ",framerate=" + std::to_string(cam.fps) + "/1";

    // 关键：tee 一路给 RTSP，一路给 fakesink，保持 v4l2src / mpph264enc 永远在跑
    std::string launch_str = "( v4l2src device=" + cam.device +
                             " io-mode=2 is-live=true do-timestamp=true"
                             " ! " +
                             caps +
                             " ! tee name=t "
                             " ! queue leaky=downstream max-size-time=0 max-size-bytes=0 max-size-buffers=0"
                             " ! mpph264enc name=enc rc-mode=cbr bps=" +
                             std::to_string(cam.bitrate) + " gop=" + std::to_string(cam.fps) +
                             " header-mode=1"
                             " ! h264parse"
                             " ! rtph264pay name=pay0 pt=96 config-interval=1 "
                             " t. ! queue leaky=downstream max-size-buffers=3 max-size-bytes=0 max-size-time=0"
                             " ! fakesink sync=false async=false )";

    LOG_INFO("[RTSP] Launch for " + cam.name + ": " + launch_str);

    GstRTSPMediaFactory* factory = gst_rtsp_media_factory_new();
    gst_rtsp_media_factory_set_launch(factory, launch_str.c_str());

    // 所有客户端共享同一个 pipeline，避免频繁拉起 v4l2 / encoder
    gst_rtsp_media_factory_set_shared(factory, TRUE);

    // 客户端断开时不要乱 suspend/reset
    gst_rtsp_media_factory_set_suspend_mode(factory, GST_RTSP_SUSPEND_MODE_NONE);

    g_signal_connect_data(factory, "media-configure", G_CALLBACK(on_media_created), g_strdup(cam.name.c_str()),
                          (GClosureNotify)g_free, (GConnectFlags)0);

    return factory;
}

void RTSPManager::start(const std::vector<Camera>& cams)
{
    server = gst_rtsp_server_new();
    gst_rtsp_server_set_service(server, "8554");

    // ✅ attach 之前设置 backlog
    gst_rtsp_server_set_backlog(server, 32);

    loop = g_main_loop_new(nullptr, FALSE);
    main_context = g_main_loop_get_context(loop);

    GstRTSPMountPoints* mounts = gst_rtsp_server_get_mount_points(server);

    for (const auto& cam : cams)
    {
        if (!cam.enabled) continue;

        GstRTSPMediaFactory* factory = create_media_factory(cam);
        std::string mount_point = "/" + cam.name;

        gst_rtsp_mount_points_add_factory(mounts, mount_point.c_str(), factory);

        {
            std::lock_guard<std::mutex> lock(mounted_factories_mutex);
            mounted_factories[cam.name] = factory;
            streaming_status[cam.name] = true;
        }

        // 初始化计数
        {
            std::lock_guard<std::mutex> lock(g_client_count_mutex);
            g_client_count.emplace(cam.name, 0);
        }

        LOG_INFO("[RTSP] Camera '" + cam.name + "' mounted at rtsp://0.0.0.0:8554" + mount_point);
    }

    g_object_unref(mounts);

    gst_rtsp_server_attach(server, nullptr);

    LOG_INFO("[RTSP] Server running on rtsp://0.0.0.0:8554");
    g_main_loop_run(loop);

    if (server)
    {
        g_object_unref(server);
        server = nullptr;
    }
    if (loop)
    {
        g_main_loop_unref(loop);
        loop = nullptr;
    }

    LOG_INFO("[RTSP] Server stopped.");
}

void RTSPManager::on_media_created(GstRTSPMediaFactory*, GstRTSPMedia* media, gpointer user_data)
{
    const char* cam_name = static_cast<const char*>(user_data);

    // ✅ 只做日志降噪：别让“抑制”影响生命周期处理
    bool noisy = false;
    auto now = std::chrono::steady_clock::now();
    {
        std::lock_guard<std::mutex> lock(last_media_ts_mutex);
        auto& last = last_media_ts[cam_name];
        if (last.time_since_epoch().count() != 0 && now - last < std::chrono::seconds(2)) noisy = true;
        last = now;
    }

    int count_after = 0;
    {
        std::lock_guard<std::mutex> lock(g_client_count_mutex);
        int& c = g_client_count[cam_name];  // 若不存在会创建；这里无所谓
        c++;
        count_after = c;
    }

    if (noisy)
    {
        LOG_WARN(std::string("[RTSP] media-configure frequent: ") + cam_name +
                 " (active_sessions=" + std::to_string(count_after) + ")");
    }
    else
    {
        LOG_INFO(std::string("[RTSP] media-configure for camera: ") + cam_name +
                 " (active_sessions=" + std::to_string(count_after) + ")");
    }

    // ✅ 生命周期绑定：unprepared 一定会对应减计数
    g_signal_connect_data(media, "unprepared", G_CALLBACK(on_media_unprepared), g_strdup(cam_name),
                          (GClosureNotify)g_free, (GConnectFlags)0);
}

void RTSPManager::on_media_unprepared(GstRTSPMedia* /*media*/, gpointer user_data)
{
    const char* cam_name = static_cast<const char*>(user_data);

    int count_after = 0;
    {
        std::lock_guard<std::mutex> lock(g_client_count_mutex);
        auto it = g_client_count.find(cam_name);
        if (it == g_client_count.end())
        {
            // 可能发生在 unmount 后 teardown 仍在进行的边界情况
            LOG_WARN(std::string("[RTSP] media-unprepared but cam not in client_count: ") + cam_name);
            return;
        }

        if (it->second > 0) it->second--;
        count_after = it->second;
    }

    LOG_INFO(std::string("[RTSP] media-unprepared: ") + cam_name + " (active_sessions=" + std::to_string(count_after) +
             ")");

    // ✅ 不要 g_object_unref(media) —— gst-rtsp-server 会处理
}

gboolean RTSPManager::mount_camera_in_main(gpointer data)
{
    Camera* cam = static_cast<Camera*>(data);
    if (!cam || !server)
    {
        delete cam;
        return G_SOURCE_REMOVE;
    }

    GstRTSPMountPoints* mounts = gst_rtsp_server_get_mount_points(server);

    std::string mount_point = "/" + cam->name;
    GstRTSPMediaFactory* factory = create_media_factory(*cam);

    gst_rtsp_mount_points_add_factory(mounts, mount_point.c_str(), factory);
    g_object_unref(mounts);

    {
        std::lock_guard<std::mutex> lock(mounted_factories_mutex);
        mounted_factories[cam->name] = factory;
        streaming_status[cam->name] = true;
    }

    {
        std::lock_guard<std::mutex> lock(g_client_count_mutex);
        g_client_count[cam->name] = 0;
    }

    LOG_INFO("[RTSP] Camera '" + cam->name + "' mounted at rtsp://localhost:8554" + mount_point);

    delete cam;
    return G_SOURCE_REMOVE;
}

gboolean RTSPManager::unmount_camera_in_main(gpointer data)
{
    Camera* cam = static_cast<Camera*>(data);
    if (!cam || !server)
    {
        delete cam;
        return G_SOURCE_REMOVE;
    }

    std::string cam_name = cam->name;
    std::string mount_point = "/" + cam_name;

    // ✅ 仅移除 mount；media teardown 交给 gst-rtsp-server
    GstRTSPMountPoints* mounts = gst_rtsp_server_get_mount_points(server);
    if (mounts)
    {
        gst_rtsp_mount_points_remove_factory(mounts, mount_point.c_str());
        g_object_unref(mounts);
    }

    {
        std::lock_guard<std::mutex> lock(mounted_factories_mutex);
        auto it = mounted_factories.find(cam_name);
        if (it != mounted_factories.end())
        {
            // 为了避免 double-unref：这里不手动 unref factory
            mounted_factories.erase(it);
        }
        streaming_status[cam_name] = false;
    }

    {
        std::lock_guard<std::mutex> lock(g_client_count_mutex);
        g_client_count.erase(cam_name);
    }

    LOG_INFO("[RTSP] Camera '" + cam_name + "' unmounted.");
    delete cam;
    return G_SOURCE_REMOVE;
}

void RTSPManager::mount_camera(const Camera& cam)
{
    Camera* camCopy = new Camera(cam);
    g_main_context_invoke(
        main_context, [](gpointer data) -> gboolean { return RTSPManager::mount_camera_in_main(data); }, camCopy);
}

void RTSPManager::unmount_camera(const Camera& cam)
{
    Camera* camCopy = new Camera(cam);
    g_main_context_invoke(
        main_context, [](gpointer data) -> gboolean { return RTSPManager::unmount_camera_in_main(data); }, camCopy);
}

bool RTSPManager::is_streaming(const std::string& cam_name)
{
    std::lock_guard<std::mutex> lock(mounted_factories_mutex);
    auto it = streaming_status.find(cam_name);
    return it != streaming_status.end() ? it->second : false;
}

bool RTSPManager::is_any_streaming()
{
    std::lock_guard<std::mutex> lock(mounted_factories_mutex);
    for (auto& kv : streaming_status)
        if (kv.second) return true;
    return false;
}

void RTSPManager::stop()
{
    if (!loop) return;

    if (server) gst_rtsp_server_set_backlog(server, 0);  // optional

    if (main_context)
    {
        g_main_context_invoke(
            main_context,
            [](gpointer data) -> gboolean
            {
                g_main_loop_quit(static_cast<GMainLoop*>(data));
                return G_SOURCE_REMOVE;
            },
            loop);
    }

    g_main_loop_quit(loop);
}