Re: linux-6.4 alsa sound broken

[Takashi Iwai <tiwai@suse.de>]

On Wed, 03 May 2023 14:19:54 +0200,
Jeff Chua wrote:
> 
> On Wed, May 3, 2023 at 2:06 PM Takashi Iwai <tiwai@suse.de> wrote:
> >
> > On Wed, 03 May 2023 06:37:48 +0200,
> > Bagas Sanjaya wrote:
> > >
> > > On 5/3/23 11:34, Bagas Sanjaya wrote:
> > > >> Just send .. in another email. If the atttachment got stripped off,
> > > >> please let me know.
> > > >>
> > > >>
> > > >
> > > > I don't see your attachment. Can you please post the link
> > > > to your test file on file storage hosting instead?
> > > >
> > >
> > > Oops, I don't see the attachment on your reply at [1]. Sorry for the
> > > inconvenience.
> > >
> > > [1]: https://lore.kernel.org/lkml/CAAJw_ZveoPfnBsSkHZqmLiVWATcOosR--6Ds4cdekdi=t1yV7A@mail.gmail.com/
> >
> > I see no attachment of the recorded sound.  In the mail above, only
> > Side_Right.wav was attached, and this is the same file in
> > /usr/share/sounds/alsa/.
> >
> > But, I wonder how you played a mono channel file with "hw:1,0" PCM.
> > Isn't this a HD-audio device?
> > Usually HD-audio codec can't play a mono file.  For example, on my
> > machine with a Realtek codec fails like:
> >
> > % aplay -Dhw:0,0 Side_Right.wav
> > Playing WAVE 'Side_Right.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono
> > aplay: set_params:1358: Channels count non available
> >
> > So, if it works on yours, please show the output of playback with
> > aplay -v option.  This will show more details.
> 
> # aplay -v
> Playing WAVE '/local/share/sounds/alsa/Side_Right.wav' : Signed 16 bit
> Little Endian, Rate 48000 Hz, Mono
> Plug PCM: Route conversion PCM (sformat=S32_LE)
>   Transformation table:
>     0 <- 0
>     1 <- 0
> Its setup is:
>   stream       : PLAYBACK
>   access       : RW_INTERLEAVED
>   format       : S16_LE
>   subformat    : STD
>   channels     : 1
>   rate         : 48000
>   exact rate   : 48000 (48000/1)
>   msbits       : 16
>   buffer_size  : 16384
>   period_size  : 1024
>   period_time  : 21333
>   tstamp_mode  : NONE
>   tstamp_type  : MONOTONIC
>   period_step  : 1
>   avail_min    : 1024
>   period_event : 0
>   start_threshold  : 16384
>   stop_threshold   : 16384
>   silence_threshold: 0
>   silence_size : 0
>   boundary     : 4611686018427387904
> Slave: Soft volume PCM
> Control: PCM Playback Volume
> min_dB: -51
> max_dB: 0
> resolution: 256
> Its setup is:
>   stream       : PLAYBACK
>   access       : MMAP_INTERLEAVED
>   format       : S32_LE
>   subformat    : STD
>   channels     : 2
>   rate         : 48000
>   exact rate   : 48000 (48000/1)
>   msbits       : 32
>   buffer_size  : 16384
>   period_size  : 1024
>   period_time  : 21333
>   tstamp_mode  : NONE
>   tstamp_type  : MONOTONIC
>   period_step  : 1
>   avail_min    : 1024
>   period_event : 0
>   start_threshold  : 16384
>   stop_threshold   : 16384
>   silence_threshold: 0
>   silence_size : 0
>   silence_size : 0
>   boundary     : 4611686018427387904
> Slave: Direct Stream Mixing PCM
> Its setup is:
>   stream       : PLAYBACK
>   access       : MMAP_INTERLEAVED
>   format       : S32_LE
>   subformat    : STD
>   channels     : 2
>   rate         : 48000
>   exact rate   : 48000 (48000/1)
>   msbits       : 32
>   buffer_size  : 16384
>   period_size  : 1024
>   period_time  : 21333
>   tstamp_mode  : NONE
>   tstamp_type  : MONOTONIC
>   period_step  : 1
>   avail_min    : 1024
>   period_event : 0
>   start_threshold  : 16384
>   stop_threshold   : 16384
>   silence_threshold: 0
>   silence_size : 0
>   boundary     : 4611686018427387904
> Hardware PCM card 0 'HDA Intel PCH' device 0 subdevice 0
> Its setup is:
>   stream       : PLAYBACK
>   access       : MMAP_INTERLEAVED
>   format       : S32_LE
>   subformat    : STD
>   channels     : 2
>   rate         : 48000
>   exact rate   : 48000 (48000/1)
>   msbits       : 32
>   buffer_size  : 16384
>   period_size  : 1024
>   period_time  : 21333
>   tstamp_mode  : ENABLE
>   tstamp_type  : MONOTONIC
>   period_step  : 1
>   avail_min    : 1024
>   period_event : 0
>   start_threshold  : 1
>   stop_threshold   : 4611686018427387904
>   silence_threshold: 0
>   silence_size : 4611686018427387904
>   boundary     : 4611686018427387904
>   appl_ptr     : 0
>   hw_ptr       : 0

OK, that explains.  This is a completely different from the
configuration with hw:X,Y I expected from your description.
So, this is with dmix, and it indeed relies on the auto-silencing, so
the commit must be relevant.


> > Last but not least, please double-check that the problem is really
> > gone after reverting the commit 9f656705c5fa.  The commit is about the
> > auto-silencing, and it should be irrelevant unless the application
> > gives non-zero silence_size sw_params, and aplay doesn't set up it at
> > all.
> 
> 100% sure. I just compiled the latest linux git pull. Rebooted. Tested
> that the problem exists, and revert just that patch
> (9f656705c5faa18afb26d922cfc64f9fd103c38d), and the problem went away!
> 
> Sorry about the recorded.wav file that I attached earlier ... didn't
> realized that when I recorded via the loop-back, I could heard that it
> was "corrupted" on the unpatched kernel, but when I play back the same
> file on the "patched" kernel, the sound played ok.
> 
> So, loop-back using the following did not capture the problem ...
> # arecord -D hw:1,0,0 -f S16_LE -r 48000 recorded.wav
> # aplay -D hw:1,1,0 /local/share/sounds/alsa/Side_Right.wav
> 
> Attached is the problem file captured using my iPhone. bad1.m4a.
> 
> I've uploaded to
> https://github.com/jeffersonchua/linux-6.4-alsa/blob/main/bad1.m4a in
> case the attachment got stripped-off.

Ah, the arecord and aplay above with -Dhw:1,1 is for a different
(still working) card?  Better to explain it more clearly...


Takashi