Crash when opening a RAW IQ-file captured with GQRX

[andreascla]

When a RAW file with IQ samples captured with GQRX is opened, the following message appears after pressing the "Run" button:

Failed to start capture due to errors:
info: Data format detected: 32 bit float
error: Failed to open /Users/andreasc/Downloads/gqrx_20220321_213549_434000000_1200000_fc.raw as raw file: Internal error : SF_INFO struct incomplete.
error: exception in "suscan_source_open_file(new)" (build/CMakeFiles/suscan.dir/compiler_depend.ts:2492)
error: exception in "self->source = suscan_source_new(config)" (build/CMakeFiles/suscan.dir/compiler_depend.ts:508)
error: Failed to initialize source
error: exception in "new->impl = (iface->ctor) (new, ap)" (build/CMakeFiles/suscan.dir/compiler_depend.ts:606)

This is Mac OS 12.3.1

[BatchDrake]

I have to admit, the more I look into this, the more confused I am. The exerted path explicitly initializes the SF_INFO struct as described in libsndfile's documentation, and somehow this never failed until now.

What libsndfile version are you using? We confirm that this is the latest build from develop, right?

Could it be a problem with the file itself? How big is gqrx_20220321_213549_434000000_1200000_fc.raw? What is the output of the following command?

% ls -l /Users/andreasc/Downloads/gqrx_20220321_213549_434000000_1200000_fc.raw

[BatchDrake]

I've just pushed some changes to suscan that are slightly related to this issue. Try to rebuild suscan again and tell me whether it keeps happening.

[andreascla]

libsndfile is stable 1.1.0 (brew but build from source) Yes, latest develop build.

File is 81 MB (I have tried several files and they all have the same issue):

% ls -l /Users/andreasc/Downloads/gqrx_20220321_213549_434000000_1200000_fc.raw
-rw-r--r--@ 1 andreasc  staff    81M Mar 22 13:08 /Users/andreasc/Downloads/gqrx_20220321_213549_434000000_1200000_fc.raw

And finally, I rebuilt suscan but still have the same issue. Just to confirm, I don't have to rebuild anything with SigDigger itself, right?

I will try to open them in an x86 Windows machine and see if that makes any difference.

[BatchDrake]

Unless your SigDigger is particularly old, you wouldn't need to. If you are not sure, just rebuild to rule that out.

PS I see your file has extended attributes (see the @). What's the output of ls -l@ gqrx_...?

Cheers,

El vie., 20 may. 2022 12:23, Andreas Claesson @.***> escribió:

libsndfile is stable 1.1.0 (brew but build from source) Yes, latest develop build.

File is 81 MB (I have tried several files and they all have the same issue):

% ls -l /Users/andreasc/Downloads/gqrx_20220321_213549_434000000_1200000_fc.raw -rw-r--r--@ 1 andreasc staff 81M Mar 22 13:08 /Users/andreasc/Downloads/gqrx_20220321_213549_434000000_1200000_fc.raw

And finally, I rebuilt suscan but still have the same issue. Just to confirm, I don't have to rebuild anything with SigDigger itself, right?

I will try to open them in an x86 Windows machine and see if that makes any difference.

— Reply to this email directly, view it on GitHub https://github.com/BatchDrake/SigDigger/issues/182#issuecomment-1132737534, or unsubscribe https://github.com/notifications/unsubscribe-auth/AAEVET5ECLFSY6ESMXZ3GEDVK5RYRANCNFSM5WHP5N7Q . You are receiving this because you commented.Message ID: @.***>

[andreascla]

% ls -l@ /Users/andreasc/Downloads/gqrx_20220321_213549_434000000_1200000_fc.raw
-rw-r--r--@ 1 andreasc  staff    81M Mar 22 13:08 /Users/andreasc/Downloads/gqrx_20220321_213549_434000000_1200000_fc.raw
    com.apple.macl    72B
    com.apple.metadata:kMDItemWhereFroms     147B
    com.apple.quarantine      57B

Good catch, I removed the extended attributes just in case, but same error still...

[andreascla]

FWIW, the file opens fine on a Windows machine with the latest pre-release (March 28). Is there anything I can do to help debug this issue on Mac?

[Flamewires]

This is probably related to a recent-ish change to libsndfile to hard cap the max sample rate to 655350

https://github.com/libsndfile/libsndfile/commit/b1d642078f1278f8a1be20ff1f9206415fd34100

Edit: Looks like GR community already addressed it:

https://github.com/libsndfile/libsndfile/issues/850

The latest tip of master has it removed since: https://github.com/libsndfile/libsndfile/commit/53e7dee23435f16671e00a22ab1277624bae6f8e

Guessing next release will have the fix, till then build from tip of master if you can.

[BatchDrake]

Thanks for the info @Flamewires. I was kind of suspecting something like that. I am triggering a new development build now.

[BatchDrake]

Quick update: Since many people are still building against the faulty libsndfile, I just added a workaround in develop to handle raw files with arbitrary sample rates (nothing fancy, I basically trick the library into thinking that the sample rate of the file is 1 ksps).

This issue has already been addressed in Windows builds thanks to the MSYS2 people, but macOS builds keep failing due to a problem in SoapySDR's PothosCore (I already filed an issue for that, but I have not received any answer yet).

[BatchDrake]

Hi,

libsndfile seems to have been patched since my last message. Feel free to reopen it if raw files keep crashing after the update.

Cheers,