A minimal self-contained demo program ('test-format') has been
developed
and is attached, that demonstrates the issue 100% on the reporters machine (HDA-Intel, 6-ch I believe). The output is:
root@Xeon:/home/patest# ./test-format Testing device front Num channels 6 Testing rate: 22050 Result:...Invalid Sample Rate Testing rate: 32000 Result:...Invalid Sample Rate test-format: pcm_params.c:2249: snd1_pcm_hw_params_slave: Assertion
`err
= 0' failed.
Testing rate: 44100 Aborted
Alsa-info is at:
http://www.alsa-project.org/db/?f=19dfeee29f73007e61a00a8fabe3c958f7cb8e8
7
00:1b.0 0403: 8086:269a (rev 09) Subsystem: 8086:0419
{ PCI_DEVICE(0x8086, 0x269a), .driver_data = AZX_DRIVER_ICH | AZX_DCAPS_INTEL_ICH },
https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pc...
#define AZX_DCAPS_INTEL_ICH \ (AZX_DCAPS_OLD_SSYNC | AZX_DCAPS_NO_ALIGN_BUFSIZE)
Only AZX_DCAPS_INTEL_ICH use AZX_DCAPS_NO_ALIGN_BUFSIZE
This apparently happens with or without Pulseaudio running, with just
the
single 44100 rate, and also with surround devices. Also, on all
current
Debian and Ubuntu - we have focused on Jessie.
I do not have a machine with similar hardware, so cannot duplicate the results.
Any comments, ideas etc would be appreciated.
I also can't reproduce this. So this must be pretty specific to the setup.
Could you give the exact condition to trigger the problem? Also, this happens certainly with the latest alsa-lib?
Thanks for taking a look. Just compiling and running that test program,
on
the reporter's machine, which has some sort of multi-channel HDA-Intel, is 100% reproducible. The Alsa-lib must be the one provided by Debian Jessie (which was released 25.4.2015); 1.0.28 I think. Does the Alsa-info give enough details - I can ask any specific questions.
snd_hda_prealloc_size may affect the result
when your program let alsa lib to determine those buffer size, period and period size , snd_pcm_hw_params return error on 6 channels for some hda controllers
Your program return error when using "hw" instead of assert when using "front" with 6 channels