test-source_avcodec autotest fails with ffmpeg 7.0

[berolinux]

The auto tests fail when using ffmpeg 7.0:

  tests that fail 1/52 
    /home/bero/abf/aubio/BUILD/aubio-master-x86_64/aubio-master/build/tests/test-source_avcodec 
stdout:
read a wave file as a mono vector
usage: /home/bero/abf/aubio/BUILD/aubio-master-x86_64/aubio-master/build/tests/test-source_avcodec <source_path> [samplerate] [hop_size]
examples:
 - read file.wav at original samplerate
       /home/bero/abf/aubio/BUILD/aubio-master-x86_64/aubio-master/build/tests/test-source_avcodec file.wav
 - read file.wav at 32000Hz
       /home/bero/abf/aubio/BUILD/aubio-master-x86_64/aubio-master/build/tests/test-source_avcodec file.aif 32000
 - read file.wav at original samplerate with 4096 blocks
       /home/bero/abf/aubio/BUILD/aubio-master-x86_64/aubio-master/build/tests/test-source_avcodec file.wav 0 4096 

stderr:
AUBIO-TESTS ERROR: not enough arguments, running tests
AUBIO ERROR: source_avcodec: Aborted opening null path
AUBIO ERROR: source_avcodec: Failed opening  (No such file or directory)
AUBIO ERROR: source_avcodec: Can not open /home/bero/abf/aubio/BUILD/aubio-master-x86_64/aubio-master/build/tests/44100Hz_44100f_sine441_stereo.wav with samplerate -1
AUBIO ERROR: source_avcodec: Can not open /home/bero/abf/aubio/BUILD/aubio-master-x86_64/aubio-master/build/tests/44100Hz_44100f_sine441_stereo.wav with hop_size 0
[SWR @ 0x55e22c88e500] Input channel layout "" is invalid or unsupported.
AUBIO ERROR: source_avcodec: Could not open resampling context for /home/bero/abf/aubio/BUILD/aubio-master-x86_64/aubio-master/build/tests/44100Hz_44100f_sine441_stereo.wav (Invalid argument)

Looks like something is wrong with input channel layout detection using the new ffmpeg APIs for this.

[drscotthawley]

Seeing this as well on MacOS when running make: many things compile but then it gets to this test, generates those errors above, and aborts with

make: *** [build] Error 1