Re: [meta-fsl-arm] i.MX6 audio performance

[Eric Nelson <eric.nelson@boundarydevices.com>]

Hi Gary,

On 01/03/2014 08:51 AM, Gary Thomas wrote:
> On 2014-01-03 08:23, Fabio Estevam wrote:
>> On Fri, Jan 3, 2014 at 1:19 PM, Gary Thomas <gary@mlbassoc.com> wrote:
>>> I'm trying to play MP3 files on my SabreLite (using mplayer from
>>> meta-oe).  The performance is horrible; I only hear a fraction
>>> of a second then noise/nothing then another fraction of sound, etc.
>>> If I convert the file to .WAV and play using 'aplay' the sound is
>>> perfect.
>>
>> Which mp3 decoder is being used on your test?
>
> This is what mplayer tells me:
> ==========================================================================
> 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)
>
> So I assume that it's using FFMPEG.  I get the same messages on my OMAP3
>
> I've also run the same experiment on the SabreLite using gstreamer like
> this
>     gst-launch filesrc location=file.mp3 ! audio/mpeg,layer=3 !
> ffdec_mp3 ! alsasink
> This also plays fine on the SabreLite, so it seems that it's only something
> about mplayer.
>
> 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,


Eric