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

[Gary Thomas]

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 :-(


-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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