Problem with mplayer and OSS on at91sam9g20(kernel 2.6.30)

Problem with mplayer and OSS on at91sam9g20(kernel 2.6.30)

[Sedji Gaouaou]

Hi,

We've been doing some tests here and we noticed a problem when using 
mplayer that we didn't have previously(on 2.6.27).

While playing audio through OSS emulation on 2.6.30 / at91sam9g20ek 
there seems to be issue with hardware parameters. The sound does not 
play and a bunch of error messages are comming on the console.

Here is the test case on angstrom:

-- mplayer output sample -------------------------

mplayer -quiet myfile.mp3

MPlayer 1.0rc1-4.1.2 (C) 2000-2006 MPlayer Team
CPU: ARM
Playing /media/sda/audio/01.mp3.
[..]
AUDIO: 44100 Hz, 2 ch, s16le, 192.0 kbit/13.61% (ratio: 24000->176400)
Selected audio codec: [mad] afm: libmad (libMAD MPEG layer 1-2-3)
[AO OSS]setup: driver doesn't support SNDCTL_DSP_GETOSPACE :-(

-- kernel output sample -------------------------

Atmel_ssc_dai: Entering atmel_ssc_hw_params()
natmel_ssc_hw_params: RCMR=00010420 RFMR=001f008f TCMR=4a010404 
TFMR=001f008f
atmel_ssc_dai: Starting clock
atmel_ssc_dai,hw_params: SSC initialized
Atmel_ssc_dai: Entering atmel_ssc_hw_params()
atmel_ssc_hw_params: RCMR=00010420 RFMR=001f008f TCMR=4a010404 TFMR=001f008f
atmel_ssc_dai,hw_params: SSC initialized
Atmel_ssc_dai: Entering atmel_ssc_hw_params()
atmel_ssc_hw_params: RCMR=00010420 RFMR=001f018f TCMR=4a010404 TFMR=001f018f
atmel_ssc_dai,hw_params: SSC initialized
asoc: machine hw_params failed
asoc: machine hw_params failed
asoc: machine hw_params failed
asoc: machine hw_params failed
asoc: machine hw_params failed
asoc: machine hw_params failed
asoc: machine hw_params failed
[..]
asoc: machine hw_params failed

MPlayer interrupted by signal 2 in module: ao2_init
atmel_ssc_shutdown: transmit disabled SSC_SR=0x000004cc
atmel_ssc_dau: Stopping clock
soc-audio soc-audio: shutdown
pop wq checking: Playback status: inactive waiting: yes
pop wq D1 WM8731 Playback
pop wq D3 WM8731 Playback

-- 2 error messages to note -------------------------
mplayer:
"[AO OSS]setup: driver doesn't support SNDCTL_DSP_GETOSPACE :-("

kernel:
"asoc: machine hw_params failed"


=> please note also that it is working correctly using the alsa output:
mplayer -ao alsa myfile.mp3

Here is the log while using the alsa output (it is working in this case):

root@at91sam:~$ mplayer -quiet -ao alsa /media/sda/audio/01.mp3
MPlayer 1.0rc1-4.1.2 (C) 2000-2006 MPlayer Team
CPU: ARM

Playing /media/sda/audio/01.mp3.
Audio file file format detected.
Clip info:
  Title: Angel
  Artist: Massive Attack
  Album: Mezzanine
  Year: 1998
  Comment: Ripped by Beto
  Track: 1
  Genre: Rock
==========================================================================
Forced audio codec: mad
Opening audio decoder: [libmad] libmad mpeg audio decoder
AUDIO: 44100 Hz, 2 ch, s16le, 192.0 kbit/13.61% (ratio: 24000->176400)
Selected audio codec: [mad] afm: libmad (libMAD MPEG layer 1-2-3)
==========================================================================
atmel_ssc_startup: SSC_SR=0x204
asoc: WM8731 <-> atmel-ssc0 info:
asoc: rate mask 0x6fe
asoc: min ch 1 max ch 2
asoc: min rate 8000 max rate 96000
Atmel_ssc_dai: Entering atmel_ssc_hw_params()
atmel_ssc_hw_params: RCMR=00010420 RFMR=001f018f TCMR=19010404 TFMR=001f018f
atmel_ssc_dai: Starting clock
atmel_ssc_dai,hw_params: SSC initialized
transmit enabled SSC_SR=0x000104cf
AO: [alsa] 44100Hz 2ch s16le (2 bytes per sample)
Video: no video
Starting playback...
[..]
atmel_ssc_shutdown: transmit disabled SSC_SR=0x000104c3
atmel_ssc_dau: Stopping clock
soc-audio soc-audio: shutdown
Exiting... (Quit)

pop wq checking: Playback status: inactive waiting: yes
pop wq D1 WM8731 Playback
pop wq D3 WM8731 Playback


egards,
Sedji

Re: Problem with mplayer and OSS on at91sam9g20(kernel 2.6.30)

[Mark Brown]

On Thu, Sep 24, 2009 at 02:36:26PM +0200, Sedji Gaouaou wrote:

> -- 2 error messages to note -------------------------
> mplayer:
> "[AO OSS]setup: driver doesn't support SNDCTL_DSP_GETOSPACE :-("

This is just going to be a knock on effect of the hw_params failing, I
expect...

> kernel:
> "asoc: machine hw_params failed"

...for which I'd suggest drilling down into the function to see which
operation fails.  Looking at the code I'd expect it's getting upset
because it's being called with an invalid rate (OSS emulation calls
hw_params with partially initialised parameters) but you're not seeing
the log message that ought to be printed when that happens.  Some trace
showing what causes it to return an error ought to point out the
culprit.  The usual way to fix these is to ignore any errors in the
function which isn't ideal but is needed with the way OSS emulation
works.

I won't have access to my sam9g20 board until next week to look at this
myself.  

Re: Problem with mplayer and OSS on at91sam9g20(kernel 2.6.30)

[Clemens Ladisch]

Mark Brown wrote:
> I'd expect it's getting upset because it's being called with an
> invalid rate (OSS emulation calls hw_params with partially initialised
> parameters)

But even the uninitialized parameters conform to the constraints that
were set by the driver, so they should never be invalid.

Sedji, try running mplayer with -v, this should give more log messages
with the parameters that mplayer is trying to set.


Best regards,
Clemens

Re: Problem with mplayer and OSS on at91sam9g20(kernel 2.6.30)

[Mark Brown]

On 25 Sep 2009, at 00:03, Clemens Ladisch <clemens@ladisch.de> wrote:

> Mark Brown wrote:
>> I'd expect it's getting upset because it's being called with an
>> invalid rate (OSS emulation calls hw_params with partially  
>> initialised
>> parameters)
>
> But even the uninitialized parameters conform to the constraints that
> were set by the driver, so they should never be invalid.

ASoC drivers, particularly ones doing manual clocking like this one,  
don't always express their full constraints to the application (in  
some cases it'd be far too hard).

> Sedji, try running mplayer with -v, this should give more log messages
> with the parameters that mplayer is trying to set.
>
>
> Best regards,
> Clemens

Re: Problem with mplayer and OSS on at91sam9g20(kernel 2.6.30)

[Sedji Gaouaou]

Hi,
 >> > > Mark Brown wrote:
 >>> > >> I'd expect it's getting upset because it's being called with an
 >>> > >> invalid rate (OSS emulation calls hw_params with partially
 >>> > >> initialised
 >>> > >> parameters)
 >> > >
 >> > > But even the uninitialized parameters conform to the constraints 
that
 >> > > were set by the driver, so they should never be invalid.
 > >
 > > ASoC drivers, particularly ones doing manual clocking like this one,
 > > don't always express their full constraints to the application (in
 > > some cases it'd be far too hard).
 > >
 >> > > Sedji, try running mplayer with -v, this should give more log 
messages
 >> > > with the parameters that mplayer is trying to set.

Here is the mplayer -v output:

[..]
==========================================================================
Forced audio codec: mad
Opening audio decoder: [libmad] libmad mpeg audio decoder
dec_audio: Allocating 4096 bytes for input buffer.
dec_audio: Allocating 9216 + 65536 = 74752 bytes for output buffer.
AUDIO: 44100 Hz, 2 ch, s16le, 96.0 kbit/6.80% (ratio: 12000->176400)
Selected audio codec: [mad] afm: libmad (libMAD MPEG layer 1-2-3)
==========================================================================
Building audio filter chain for 44100Hz/2ch/s16le -> 0Hz/0ch/??...
[libaf] Adding filter dummy
[dummy] Was reinitialized: 44100Hz/2ch/s16le
[dummy] Was reinitialized: 44100Hz/2ch/s16le
ao2: 44100 Hz  2 chans  s16le
audio_setup: using '/dev/dsp' dsp device
audio_setup: using '/dev/mixer' mixer device
audio_setup: using 'pcm' mixer device
audio_setup: sample format: s16le (requested: s16le)
audio_setup: using 2 channels (requested: 2)
audio_setup: using 44100 Hz samplerate (requested: 44100)
[AO OSS] audio_setup: driver doesn't support SNDCTL_DSP_GETOSPACE  :-(
audio_setup: 512 bytes/frag (config.h)
AO: [oss] 44100Hz 2ch s16le (2 bytes per sample)
AO: Description: OSS/ioctl audio output
AO: Author: A'rpi
Building audio filter chain for 44100Hz/2ch/s16le -> 44100Hz/2ch/s16le...
[dummy] Was reinitialized: 44100Hz/2ch/s16le
[dummy] Was reinitialized: 44100Hz/2ch/s16le
Video: no video
Freeing 0 unused video chunks.
Starting playback...
A:  -1.5 (unknown) of 1506.0 (25:06.0) ??,?%

[.. no sound and many "asoc: machine hw_params failed" on the console ..]

MPlayer interrupted by signal 2 in module: play_audio
Uninit audio filters...
[libaf] Removing filter dummy
Uninit audio: libmad


Thanks for your help,

Best regards,
Sedji