修复MP4点播相关bug

src/Record/MP4Demuxer.cpp

@@ -158,7 +158,7 @@ struct Context{
     BufferRaw::Ptr buffer;
 };
 
-Frame::Ptr MP4Demuxer::readFrame(bool seekKeyFrame, bool *eof) {
+Frame::Ptr MP4Demuxer::readFrame(bool &keyFrame, bool &eof) {
     static mov_reader_onread mov_reader_onread = [](void *param, uint32_t track_id, const void *buffer, size_t bytes, int64_t pts, int64_t dts, int flags) {
         Context *ctx = (Context *) param;
         ctx->pts = pts;
@@ -179,23 +179,19 @@ Frame::Ptr MP4Demuxer::readFrame(bool seekKeyFrame, bool *eof) {
     auto ret = mov_reader_read2(_mov_reader.get(), mov_onalloc, mov_reader_onread, &ctx);
     switch (ret) {
         case 0 : {
-            if(eof){
-                *eof = true;
-            }
+            eof = true;
             WarnL << "读取mp4文件完毕";
         }
             break;
 
         case 1 : {
-            if (seekKeyFrame && !(ctx.flags & MOV_AV_FLAG_KEYFREAME)) {
-                //请求key帧，但是这个帧不是
-                return nullptr;
-            }
+            keyFrame = ctx.flags & MOV_AV_FLAG_KEYFREAME;
             return makeFrame(ctx.track_id,ctx.buffer, ctx.pts, ctx.dts);
         }
             break;
 
         default:
+            eof = true;
             WarnL << "读取mp4文件数据失败:" << ret;
             break;
     }

src/Record/MP4Demuxer.h

@@ -38,7 +38,7 @@ public:
     MP4Demuxer(const char *file);
     ~MP4Demuxer() override;
     int64_t seekTo(int64_t stamp_ms);
-    Frame::Ptr readFrame(bool seekKeyFrame = false, bool *eof = nullptr);
+    Frame::Ptr readFrame(bool &keyFrame, bool &eof);
     vector<Track::Ptr> getTracks(bool trackReady) const override ;
     uint64_t getDurationMS() const;
 private:

src/Record/MP4Reader.cpp

@@ -47,7 +47,11 @@ MP4Reader::MP4Reader(const string &strVhost,const string &strApp, const string &
 
     _demuxer = std::make_shared<MP4Demuxer>(strFileName.data());
     _mediaMuxer.reset(new MultiMediaSourceMuxer(strVhost, strApp, strId, _demuxer->getDurationMS() / 1000.0, true, true, false, false));
-    for(auto &track : _demuxer->getTracks(false)){
+    auto tracks = _demuxer->getTracks(false);
+    if(tracks.empty()){
+        throw std::runtime_error(StrPrinter << "该mp4文件没有有效的track:" << strFileName);
+    }
+    for(auto &track : tracks){
         _mediaMuxer->addTrack(track);
         if(track->getTrackType() == TrackVideo){
             _have_video = true;
@@ -59,8 +63,9 @@ MP4Reader::MP4Reader(const string &strVhost,const string &strApp, const string &
 
 bool MP4Reader::readSample() {
     bool eof = false;
+    bool keyFrame = false;
     while (!eof) {
-        auto frame = _demuxer->readFrame(false, &eof);
+        auto frame = _demuxer->readFrame(keyFrame, eof);
         if (!frame) {
             break;
         }
@@ -139,12 +144,13 @@ bool MP4Reader::seekTo(uint32_t ui32Stamp){
     }
     //搜索到下一帧关键帧
     bool eof = false;
+    bool keyFrame = false;
     while (!eof) {
-        auto frame = _demuxer->readFrame(false, &eof);
+        auto frame = _demuxer->readFrame(keyFrame, eof);
         if(!frame){
             break;
         }
-        if(frame->keyFrame() || frame->configFrame()){
+        if(keyFrame || frame->keyFrame() || frame->configFrame()){
             //定位到key帧
             _mediaMuxer->inputFrame(frame);
             setNextStampForStop(frame->dts());