Restore metaknob effect switch behavior#17
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Restore metaknob effect switch behavior#17daschuer wants to merge 6 commits intoBe-ing:restore_metaknob_effect_switch_behaviorfrom
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…h sync
When loading a track that is not yet present in the library (and thus
doesn't have any BPM because it hasn't been analyzed yet) while another
deck is playing and both decks have sync enabled, a debug assertion is
triggered:
DEBUG ASSERT: "isValid()" in function double mixxx::Bpm::value() const at src/track/bpm.h:53
Aborted (core dumped)
The backtrace looks as follows:
#0 0x00007f175c87234c in __pthread_kill_implementation () at /usr/lib/libc.so.6
#1 0x00007f175c8254b8 in raise () at /usr/lib/libc.so.6
#2 0x00007f175c80f534 in abort () at /usr/lib/libc.so.6
#3 0x00007f175cf05ee4 in qt_assert(char const*, char const*, int) () at /usr/lib/libQt5Core.so.5
#4 0x000055deb2e67e1c in mixxx::(anonymous namespace)::handleMessage(QtMsgType, QMessageLogContext const&, QString const&) (type=<optimized out>, context=<optimized out>, input=<optimized out>) at src/util/logging.cpp:355
#5 0x00007f175cf47128 in () at /usr/lib/libQt5Core.so.5
#6 0x00007f175cf3fd8a in () at /usr/lib/libQt5Core.so.5
#7 0x00007f175cf06526 in QMessageLogger::critical(char const*, ...) const () at /usr/lib/libQt5Core.so.5
#8 0x000055deb2e5c720 in mixxx_debug_assert(char const*, char const*, int, char const*) (assertion=assertion@entry=0x55deb39bd0db "isValid()", file=file@entry=0x55deb39bbf30 "src/track/bpm.h", line=line@entry=53, function=function@entry=0x55deb39bbf08 "double mixxx::Bpm::value() const") at gsrc/util/assert.h:9
#9 0x000055deb2ee7e7e in mixxx_debug_assert_return_true(char const*, char const*, int, char const*) (function=0x55deb39bbf08 "double mixxx::Bpm::value() const", line=53, file=0x55deb39bbf30 "src/track/bpm.h", assertion=0x55deb39bd0db "isValid()") at gsrc/util/assert.h:18
#10 mixxx::Bpm::value() const (this=<synthetic pointer>) at src/track/bpm.h:53
#11 mixxx::operator*(mixxx::Bpm, double) (multiple=1, bpm=...) at src/track/bpm.h:160
#12 SyncControl::setLocalBpm(mixxx::Bpm) (this=<optimized out>, localBpm=...) at src/engine/sync/synccontrol.cpp:567
#13 0x000055deb34c7ba3 in EngineBuffer::postProcess(int) (this=0x55deb56eb060, iBufferSize=2048) at src/engine/enginebuffer.cpp:1318
#14 0x000055deb3139023 in EngineMaster::processChannels(int) (this=0x55deb5449440, iBufferSize=<optimized out>) at src/engine/enginemaster.cpp:383
#15 0x000055deb31394f7 in EngineMaster::process(int) (this=0x55deb5449440, iBufferSize=iBufferSize@entry=2048) at src/engine/enginemaster.cpp:410
#16 0x000055deb2f91d0b in SoundManager::onDeviceOutputCallback(long) (this=<optimized out>, iFramesPerBuffer=iFramesPerBuffer@entry=1024) at src/soundio/soundmanager.cpp:596
#17 0x000055deb32dd794 in SoundDevicePortAudio::callbackProcessClkRef(long, float*, float const*, PaStreamCallbackTimeInfo const*, unsigned long) (this=0x55deb553e6b0, framesPerBuffer=1024, out=<optimized out>, in=<optimized out>, timeInfo=<optimized out>, statusFlags=<optimized out>) at src/soundio/sounddeviceportaudio.cpp:965
This happens because `newLocalBpm` is invalid when `localBpm` is
invalid. Trying to do sync decks while no tempo information is available
does not make sense, so we only synchronize decks if the local BPM is
available.
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