[meta-freescale] [meta-fsl-arm] i.MX6 audio performance

[Marco]

Il 05/01/2014 16:16, Gary Thomas ha scritto:
> On 2014-01-04 08:43, Eric Nelson wrote:
>> Hi Gary,
>>
>> On 01/03/2014 02:05 PM, Gary Thomas wrote:
>>> On 2014-01-03 12:24, Eric Nelson wrote:
>>>> Hi Gary,
>>>>
>>>> On 01/03/2014 10:15 AM, Gary Thomas wrote:
>>>>> On 2014-01-03 10:06, Eric Nelson wrote:
>>>>>> Hi Gary,
>>>>>>
>>>>>>  <snip>
>>>>>>
>>>>>>> I also noticed that on the SabreLite, mplayer is using an additional
>>>>>>> library
>>>>>>>    libXxf86dga.so.1
>>>>>>> and that it was built using hard floating point (the OMAP3 is soft).
>>>>>>>
>>>>>>> Any ideas?
>>>>>>>
>>>>>> Are you forcing ALSA output using '-ao alsa'? I've seen some issues
>>>>>> with
>>>>>> OSS emulation and I'm not sure of the default.
>>>>>>
>>>>>> Please advise,
>>>>>
>>>>> No, I'm using it straight
>>>>>    # mplayer FILE.mp3
>>>>> Same on both platforms
>>>>>
>>>>
>>>> Do you see an output line indicating the AO used?
>>>>
>>>> It should show something like this:
>>>>      AO: [alsa] 44100Hz 2ch s16le (2 bytes per sample)
>>>>
>>>> Can you try using '-ao alsa'?
>>>
>>> Same results.  Here's everything printed by mplayer:
>>>
>>> root at sabrelite:~# mplayer test.mp3 -ao alsa
>>> MPlayer2 2.0-379-ge3f5043 (C) 2000-2011 MPlayer Team
>>> 162 audio & 361 video codecs
>>>
>>> Playing test.mp3.
>>> Detected file format: MPEG audio layer 2/3 (libavformat)
>>> [mp3 @ 0x2bb83690]max_analyze_duration reached
>>> [lavf] stream 0: audio (mp3), -aid 0
>>> Clip info:
>>>   title: Wedding Bells
>>>   artist: Gas House Gang
>>>   album: Face The Music
>>>   TYER: 0
>>>   genre: Vocal
>>>   track: 2
>>> Load subtitles in .
>>> ==========================================================================
>>>
>>> Forced audio codec: mad
>>> Requested audio codec family [mad] (afm=libmad) not available.
>>> Enable it at compilation.
>>> Requested audio codec family [mpg123] (afm=mpg123) not available.
>>> Enable it at compilation.
>>> Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
>>> AUDIO: 44100 Hz, 2 ch, floatle, 128.0 kbit/4.54% (ratio: 16002->352800)
>>> Selected audio codec: [ffmp3float] afm: ffmpeg (FFmpeg MPEG layer-3
>>> audio)
>>> ==========================================================================
>>>
>>
>> This is likely the culprit. I don't think that floatle is a valid audio
>> format for either the SGTL5000 or HDMI devices:
>
> It makes sound - just choppy (not like it makes only noise)
>
> Give a listen to these to hear what I'm talking about.
>    http://www.mlbassoc.com/poky/sample-BAD.m4a
>    http://www.mlbassoc.com/poky/sample-OK.m4a
>
>>
>>> AO: [alsa] 44100Hz 2ch floatle (4 bytes per sample)
>>> Video: no video
>>> Starting playback...
>>>
>>> To see if this is user code or kernel driver, I tried running my OMAP3
>>> file system on the SabreLite (the OMAP3/Cortex-A8 is pretty much a
>>> subset
>>> of the CPU).  Same results - broken sound when using mplayer :-(
>
>


I tested it with Gstreamer and it worked with a charm

gst-launch filesrc location=/home/root/blurred_lines.mp3 ! 
mpegaudioparse ! beepdec ! audioconvert ! alsasink

Just my 2 cents.


Cordiali Saluti / Kindest Regards / Mit freundlichen Grüßen
--
Marco Cavallini | KOAN sas | Bergamo - Italia
  embedded and real-time software engineering
Phone:+39-035-255.235 - Fax:+39-178-22.39.748
       http://www.KoanSoftware.com
         http://www.KaeilOS.com