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

[Gary Thomas]

On 2014-01-05 10:52, Marco wrote:
> 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.

Agreed, it works fine with gstreamer, just not mplayer which works
great on all of my other platforms :-(