a rare crash when reading MP3 files

[yui-3]

the probability of crashing is low, and there is no particularly complex logic. It just reads the header information of several MP3 files.

[Inline Frame] MyProject-Win64-Shipping.exe!hdr_valid(const unsigned char *) Line 266 C++ MyProject-Win64-Shipping.exe!hdr_compare(const unsigned char * h1, const unsigned char * h2) Line 275 C++ [Inline Frame] MyProject-Win64-Shipping.exe!mp3d_match_frame(const unsigned char *) Line 1665 C++ MyProject-Win64-Shipping.exe!mp3d_find_frame(const unsigned char * mp3, int mp3_bytes, int * free_format_bytes, int * ptr_frame_bytes) Line 1695 C++ [Inline Frame] MyProject-Win64-Shipping.exe!mp3dec_detect_cb(mp3dec_io_t *) Line 277 C++ [Inline Frame] MyProject-Win64-Shipping.exe!mp3dec_detect_buf(const unsigned char *) Line 242 C++ MyProject-Win64-Shipping.exe!FMP3_RuntimeCodec::CheckAudioFormat(const FRuntimeBulkDataBuffer & AudioData) Line 22 C++ [Inline Frame] MyProject-Win64-Shipping.exe!FRuntimeCodecFactory::GetCodecs(const FRuntimeBulkDataBuffer &) Line 64 C++ MyProject-Win64-Shipping.exe!URuntimeAudioUtilities::GetAudioHeaderInfoFromBuffer::__l2::<lambda_1>::operator()() Line 86 C++ [External Code] [Frames may be missing, no binary loaded for kernel32.dll] [External Code]

Unhandled exception at 0x00007FF6C1963F00 (MyProject-Win64-Shipping.exe) in UEMinidump.dmp: 0xC0000005: Access violation reading location 0x000002B733B00B40.

[gtreshchev]

Hi, could you please ensure that the used objects, specifically the imported sound wave and runtime audio importer library, are represented in Blueprint variables or, if you're working in C++, are marked with UPROPERTY/any other strong references to prevent them from being garbage collected? Also, I’m wondering about the audio files you are using, could you please provide links to them, if possible?

[yui-3]

Thanks for your reply, I've changed my implementation. but at that time I was just calling this function in Blueprint, like the image. I have a UserWidget class for displaying audio information, which reads audio header information from a file during construction. When I have dozens of audio files, this is when the issue occurs.

and the audio files is here: https://drive.google.com/file/d/1n0MamZH-fhjPdOD7zhMihj9hLPPmgAD-/view?usp=drive_link

[gtreshchev]

The issue might be related to checking all codecs directly by the buffer, with one of them failing and causing a crash for some reason, though I wasn't able to reproduce it. I've pushed a fix to also consider the path, specifically the extension of the file.

You might also try changing the default mp3 codec from minimp3 to dr_mp3 by setting bUseDrMp3 to true here: https://github.com/gtreshchev/RuntimeAudioImporter/blob/main/Source/RuntimeAudioImporter/RuntimeAudioImporter.Build.cs#L27