精确mp4录制时长：#1795

src/Record/MP4Muxer.cpp

@@ -61,6 +61,16 @@ bool MP4MuxerInterface::haveVideo() const {
     return _have_video;
 }
 
+uint64_t MP4MuxerInterface::getDuration() const {
+    uint64_t ret = 0;
+    for (auto &pr : _codec_to_trackid) {
+        if (pr.second.stamp.getRelativeStamp() > ret) {
+            ret = pr.second.stamp.getRelativeStamp();
+        }
+    }
+    return ret;
+}
+
 void MP4MuxerInterface::resetTracks() {
     _started = false;
     _have_video = false;

src/Record/MP4Muxer.h

@@ -58,6 +58,11 @@ public:
      */
     void initSegment();
 
+    /**
+     * 获取mp4时长,单位毫秒
+     */
+    uint64_t getDuration() const;
+
 protected:
     virtual MP4FileIO::Writer createWriter() = 0;
 

src/Record/MP4Recorder.cpp

@@ -70,11 +70,9 @@ void MP4Recorder::asyncClose() {
     auto full_path = _full_path;
     auto info = _info;
     WorkThreadPool::Instance().getExecutor()->async([muxer, full_path_tmp, full_path, info]() mutable {
-        //获取文件录制时间，放在关闭mp4之前是为了忽略关闭mp4执行时间
-        info.time_len = (float) (::time(NULL) - info.start_time);
-        //关闭mp4非常耗时，所以要放在后台线程执行
+        info.time_len = muxer->getDuration() / 1000.0f;
+        // 关闭mp4可能非常耗时，所以要放在后台线程执行
         muxer->closeMP4();
-        
         if (!full_path_tmp.empty()) {
             // 获取文件大小
             info.file_size = File::fileSize(full_path_tmp.data());
@@ -86,8 +84,7 @@ void MP4Recorder::asyncClose() {
             // 临时文件名改成正式文件名，防止mp4未完成时被访问
             rename(full_path_tmp.data(), full_path.data());
         }
-
-        /////record 业务逻辑//////
+        //触发mp4录制切片生成事件
         NoticeCenter::Instance().emitEvent(Broadcast::kBroadcastRecordMP4, info);
     });
 }