mk_media接口支持无人观看事件

api/include/mk_media.h

@@ -129,6 +129,31 @@ API_EXPORT void API_CALL mk_media_input_aac(mk_media ctx, void *data, int len, u
  */
 API_EXPORT void API_CALL mk_media_input_aac1(mk_media ctx, void *data, int len, uint32_t dts, void *adts);
 
+/**
+ * 在调用对应的MediaSource.close()时会触发该回调
+ * 你可以在该事件中做清理工作（比如说关闭摄像头，同时调用mk_media_release函数销毁该对象）
+ * @param user_data 用户数据指针，通过mk_media_set_on_close函数设置
+ * @return 返回0告知事件触发者关闭媒体失败，非0代表成功
+ */
+typedef int(API_CALL *on_mk_media_close)(void *user_data);
+
+/**
+ * 监听MediaSource.close()事件
+ * 在选择关闭一个MediaSource时，将会最终触发到该回调
+ * 你可以通过该事件选择删除对象，当然你在该事件中也可以什么都不做
+ * @param ctx 对象指针
+ * @param cb 回调指针
+ * @param user_data 用户数据指针
+ */
+API_EXPORT void API_CALL mk_media_set_on_close(mk_media ctx, on_mk_media_close cb, void *user_data);
+
+/**
+ * 获取总的观看人数
+ * @param ctx 对象指针
+ * @return 观看人数
+ */
+API_EXPORT int API_CALL mk_media_total_reader_count(mk_media ctx);
+
 #ifdef __cplusplus
 }
 #endif

api/source/mk_media.cpp

@@ -32,77 +32,151 @@ using namespace std;
 using namespace toolkit;
 using namespace mediakit;
 
+class MediaHelper : public MediaSourceEvent , public std::enable_shared_from_this<MediaHelper> {
+public:
+    typedef std::shared_ptr<MediaHelper> Ptr;
+    template<typename ...ArgsType>
+    MediaHelper(ArgsType &&...args){
+        _channel = std::make_shared<DevChannel>(std::forward<ArgsType>(args)...);
+    }
+    ~MediaHelper(){}
+
+    void attachEvent(){
+        _channel->setListener(shared_from_this());
+    }
+
+    DevChannel::Ptr &getChannel(){
+        return _channel;
+    }
+
+    void setCallBack(on_mk_media_close cb, void *user_data){
+        _cb = cb;
+        _user_data = user_data;
+    }
+protected:
+    // 通知其停止推流
+    bool close(MediaSource &sender,bool force) override{
+        if(!force && _channel->totalReaderCount()){
+            //非强制关闭且正有人在观看该视频
+            return false;
+        }
+        if(!_cb){
+            //未设置回调，没法关闭
+            return false;
+        }
+        if(!_cb(_user_data)){
+            //回调选择返回不关闭该视频
+            return false;
+        }
+
+        //回调中已经关闭该视频
+        string err = StrPrinter << "close media:" << sender.getSchema() << "/" << sender.getVhost() << "/" << sender.getApp() << "/" << sender.getId() << " " << force;
+        return true;
+    }
+
+    // 通知无人观看
+    void onNoneReader(MediaSource &sender) override{
+        if(_channel->totalReaderCount()){
+            //统计有误，还有人在看
+            return;
+        }
+        MediaSourceEvent::onNoneReader(sender);
+    }
+
+    // 观看总人数
+    int totalReaderCount(MediaSource &sender) override{
+        return _channel->totalReaderCount();
+    }
+private:
+    DevChannel::Ptr _channel;
+    on_mk_media_close _cb;
+    void *_user_data;
+};
+
+API_EXPORT void API_CALL mk_media_set_on_close(mk_media ctx, on_mk_media_close cb, void *user_data){
+    assert(ctx);
+    MediaHelper::Ptr *obj = (MediaHelper::Ptr *) ctx;
+    (*obj)->setCallBack(cb,user_data);
+}
+
+API_EXPORT int API_CALL mk_media_total_reader_count(mk_media ctx){
+    assert(ctx);
+    MediaHelper::Ptr *obj = (MediaHelper::Ptr *) ctx;
+    return (*obj)->getChannel()->totalReaderCount();
+}
+
 API_EXPORT mk_media API_CALL mk_media_create(const char *vhost, const char *app, const char *stream, float duration, int hls_enabled, int mp4_enabled) {
     assert(vhost && app && stream);
-    DevChannel::Ptr *obj(new DevChannel::Ptr(new DevChannel(vhost, app, stream, duration, true, true, hls_enabled, mp4_enabled)));
+    MediaHelper::Ptr *obj(new MediaHelper::Ptr(new MediaHelper(vhost, app, stream, duration, true, true, hls_enabled, mp4_enabled)));
+    (*obj)->attachEvent();
     return (mk_media) obj;
 }
 
 API_EXPORT void API_CALL mk_media_release(mk_media ctx) {
     assert(ctx);
-    DevChannel::Ptr *obj = (DevChannel::Ptr *) ctx;
+    MediaHelper::Ptr *obj = (MediaHelper::Ptr *) ctx;
     delete obj;
 }
 
 API_EXPORT void API_CALL mk_media_init_h264(mk_media ctx, int width, int height, int frameRate) {
     assert(ctx);
-    DevChannel::Ptr *obj = (DevChannel::Ptr *) ctx;
+    MediaHelper::Ptr *obj = (MediaHelper::Ptr *) ctx;
     VideoInfo info;
     info.iFrameRate = frameRate;
     info.iWidth = width;
     info.iHeight = height;
-    (*obj)->initVideo(info);
+    (*obj)->getChannel()->initVideo(info);
 }
 
 API_EXPORT void API_CALL mk_media_init_h265(mk_media ctx, int width, int height, int frameRate) {
     assert(ctx);
-    DevChannel::Ptr *obj = (DevChannel::Ptr *) ctx;
+    MediaHelper::Ptr *obj = (MediaHelper::Ptr *) ctx;
     VideoInfo info;
     info.iFrameRate = frameRate;
     info.iWidth = width;
     info.iHeight = height;
-    (*obj)->initH265Video(info);
+    (*obj)->getChannel()->initH265Video(info);
 }
 
 API_EXPORT void API_CALL mk_media_init_aac(mk_media ctx, int channel, int sample_bit, int sample_rate, int profile) {
     assert(ctx);
-    DevChannel::Ptr *obj = (DevChannel::Ptr *) ctx;
+    MediaHelper::Ptr *obj = (MediaHelper::Ptr *) ctx;
     AudioInfo info;
     info.iSampleRate = sample_rate;
     info.iChannel = channel;
     info.iSampleBit = sample_bit;
     info.iProfile = profile;
-    (*obj)->initAudio(info);
+    (*obj)->getChannel()->initAudio(info);
 }
 
 API_EXPORT void API_CALL mk_media_init_complete(mk_media ctx){
     assert(ctx);
-    DevChannel::Ptr *obj = (DevChannel::Ptr *) ctx;
-    (*obj)->addTrackCompleted();
+    MediaHelper::Ptr *obj = (MediaHelper::Ptr *) ctx;
+    (*obj)->getChannel()->addTrackCompleted();
 }
 
 API_EXPORT void API_CALL mk_media_input_h264(mk_media ctx, void *data, int len, uint32_t dts, uint32_t pts) {
     assert(ctx && data && len > 0);
-    DevChannel::Ptr *obj = (DevChannel::Ptr *) ctx;
-    (*obj)->inputH264((char *) data, len, dts, pts);
+    MediaHelper::Ptr *obj = (MediaHelper::Ptr *) ctx;
+    (*obj)->getChannel()->inputH264((char *) data, len, dts, pts);
 }
 
 API_EXPORT void API_CALL mk_media_input_h265(mk_media ctx, void *data, int len, uint32_t dts, uint32_t pts) {
     assert(ctx && data && len > 0);
-    DevChannel::Ptr *obj = (DevChannel::Ptr *) ctx;
-    (*obj)->inputH265((char *) data, len, dts, pts);
+    MediaHelper::Ptr *obj = (MediaHelper::Ptr *) ctx;
+    (*obj)->getChannel()->inputH265((char *) data, len, dts, pts);
 }
 
 API_EXPORT void API_CALL mk_media_input_aac(mk_media ctx, void *data, int len, uint32_t dts, int with_adts_header) {
     assert(ctx && data && len > 0);
-    DevChannel::Ptr *obj = (DevChannel::Ptr *) ctx;
-    (*obj)->inputAAC((char *) data, len, dts, with_adts_header);
+    MediaHelper::Ptr *obj = (MediaHelper::Ptr *) ctx;
+    (*obj)->getChannel()->inputAAC((char *) data, len, dts, with_adts_header);
 }
 
 API_EXPORT void API_CALL mk_media_input_aac1(mk_media ctx, void *data, int len, uint32_t dts, void *adts) {
     assert(ctx && data && len > 0 && adts);
-    DevChannel::Ptr *obj = (DevChannel::Ptr *) ctx;
-    (*obj)->inputAAC((char *) data, len, dts, (char *) adts);
+    MediaHelper::Ptr *obj = (MediaHelper::Ptr *) ctx;
+    (*obj)->getChannel()->inputAAC((char *) data, len, dts, (char *) adts);
 }