DEBUG ASSERT Beats::iteratorFrom

[Daniel Schürmann]

I have just experienced Debug Assert violation in current main branch.

critical Engine DEBUG ASSERT: "it == cbegin() || it == cend() || *it - position < std::prev(it).beatLengthFrames()" in function mixxx::Beats::ConstIterator mixxx::Beats::iteratorFrom(mixxx::audio::FramePos) const at /home/daniel/workspace/2.3/src/track/beats.cpp:447

This happens after pressing play with a loaded Track, called from
Beats::findPrevNextBeats

[Daniel Schürmann (daschuer)]

In the assertion case

*it = 32170
position = 15616
beatLengthFrames = 16554 at position 15616

[Uwe Klotz (uklotzde-deactivatedaccount)]

Just happened once while pre-listening some tracks. Probably right after loading and trying to play a track. Forget to inspect the actual values.

#7 0x00000000007a6394 in mixxx::Beats::iteratorFrom(mixxx::audio::FramePos) const (this=this@entry=0x262a6e0, position=...)
    at /home/uk/volumes/Build/cpp/mixxx/src/track/beats.cpp:450
#8 0x00000000007a4463 in mixxx::Beats::findPrevNextBeats(mixxx::audio::FramePos, mixxx::audio::FramePos*, mixxx::audio::FramePos*, bool) const (this=0x262a6e0, position=..., prevBeatPosition=0x7fffaf7fc700, nextBeatPosition=0x2, snapToNearBeats=false)
    at /home/uk/volumes/Build/cpp/mixxx/src/track/beats.cpp:382
#9 0x0000000000b0dc4f in BpmControl::getBeatContext(std::shared_ptr<mixxx::Beats const> const&, mixxx::audio::FramePos, mixxx::audio::FramePos*, mixxx::audio::FramePos*, double*, double*) (pBeats=warning: RTTI symbol not found for class 'std::_Sp_counted_ptr<mixxx::Beats*, (__gnu_cxx::_Lock_policy)2>'
warning: RTTI symbol not found for class 'std::_Sp_counted_ptr<mixxx::Beats*, (__gnu_cxx::_Lock_policy)2>'

std::shared_ptr<const mixxx::Beats> (use count 7, weak count 0) = {...}, position=..., pBeatLengthFrames=0x7fffaf7fc788, pBeatPercentage=0x7fffaf7fc768, pPrevBeatPosition=<optimized out>, pNextBeatPosition=<optimized out>)
    at /home/uk/volumes/Build/cpp/mixxx/src/engine/controls/bpmcontrol.cpp:495
#10 BpmControl::getBeatMatchPosition(mixxx::audio::FramePos, bool, bool)
     (this=0x13a8400, thisPosition=..., respectLoops=true, playing=true)
    at /home/uk/volumes/Build/cpp/mixxx/src/engine/controls/bpmcontrol.cpp:816
#11 0x000000000092e0b7 in EngineBuffer::processSeek(bool) (this=this@entry=0x1fd6d10, paused=<optimized out>)
    at /home/uk/volumes/Build/cpp/mixxx/src/engine/enginebuffer.cpp:1286
#12 0x000000000092cc14 in EngineBuffer::processTrackLocked(float*, int, mixxx::audio::SampleRate)
    (this=this@entry=0x1fd6d10, pOutput=pOutput@entry=0x7fff87d8c040, iBufferSize=iBufferSize@entry=2048, sampleRate=...)
    at /home/uk/volumes/Build/cpp/mixxx/src/engine/enginebuffer.cpp:847
#13 0x000000000092ec8d in EngineBuffer::process(float*, int) (this=0x1fd6d10, pOutput=0x7fff87d8c040, iBufferSize=2048)

[Swiftb0y (swiftb0y)]

Mixxx now uses GitHub for bug tracking. This bug has been migrated to:
https://github.com/mixxxdj/mixxx/issues/10626