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

[Eric Nelson]

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:

> 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 :-(
>

Regards,


Eric