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On 24/03/10 09:09, <a class="moz-txt-link-abbreviated" href="mailto:Aston_Ho@wistron.com">Aston_Ho@wistron.com</a> wrote:
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<p class="MsoNormal" style=""><font color="black"
face="Times New Roman" size="3"><span
style="font-size: 12pt; color: black;" lang="EN-US">Hello
Blom,<o:p></o:p></span></font></p>
<p class="MsoNormal" style=""><font color="black"
face="Times New Roman" size="3"><span
style="font-size: 12pt; color: black;" lang="EN-US"><o:p> </o:p></span></font></p>
<p class="MsoNormal" style=""><font color="black"
face="Times New Roman" size="3"><span
style="font-size: 12pt; color: black;" lang="EN-US"> I
am Aston, Nail and I work in Wistron. First we are very thankful for
your help
to release beta10 for us. <o:p></o:p></span></font></p>
<p class="MsoNormal" style=""><font color="black"
face="Times New Roman" size="3"><span
style="font-size: 12pt; color: black;" lang="EN-US">We
already build the plug-in on our arm-based Linux system, but we got the
result
of poor performance.<o:p></o:p></span></font></p>
<p class="MsoNormal" style=""><font color="black"
face="Times New Roman" size="3"><span
style="font-size: 12pt; color: black;" lang="EN-US">We
think the reason is to use Freescale i.MX51 Soc and the HW decode rely
on
Gstreamer, but maybe your solution is use the FFMpage or others.<o:p></o:p></span></font></p>
<p class="MsoNormal" style=""><font color="black"
face="Times New Roman" size="3"><span
style="font-size: 12pt; color: black;" lang="EN-US">The
totem player with the Gstreamer library on our system can get better
performance.<o:p></o:p></span></font></p>
<p class="MsoNormal" style=""><font color="black"
face="Times New Roman" size="3"><span
style="font-size: 12pt; color: black;" lang="EN-US">So,
would you please try to apply the Gstreamer library into the ambulant
plug-in.<o:p></o:p></span></font></p>
<p class="MsoNormal" style=""><font color="black"
face="Times New Roman" size="3"><span
style="font-size: 12pt; color: black;" lang="EN-US"><o:p> </o:p></span></font></p>
<p class="MsoNormal" style=""><font color="black"
face="Times New Roman" size="3"><span
style="font-size: 12pt; color: black;" lang="EN-US">We
very much hope that through this project with Ambulant solutions to
allow more
users to their favorite (of course, also love Ambulant too)<o:p></o:p></span></font></p>
<p class="MsoNormal" style=""><font color="black"
face="Times New Roman" size="3"><span
style="font-size: 12pt; color: black;" lang="EN-US">Finally,
We very much hope to get your help!<o:p></o:p></span></font></p>
<p class="MsoNormal" style=""><font color="black"
face="Times New Roman" size="3"><span
style="font-size: 12pt; color: black;" lang="EN-US"><o:p> </o:p></span></font></p>
<p class="MsoNormal" style=""><font color="black"
face="Times New Roman" size="3"><span
style="font-size: 12pt; color: black;" lang="EN-US">Best
Regards,<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-indent: 60pt;"><font color="black"
face="Times New Roman" size="3"><span
style="font-size: 12pt; color: black;" lang="EN-US"><o:p> </o:p></span></font></p>
<p class="MsoNormal" style=""><font color="black"
face="Times New Roman" size="3"><span
style="font-size: 12pt; color: black;" lang="EN-US">Aston<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="1"><span
style="font-size: 9pt; font-family: Arial;" lang="EN-US"><o:p> </o:p></span></font></p>
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</blockquote>
Hi Aston,<br>
<br>
Currently, ambulant for linux is based on ffmpeg.<br>
<br>
Sometime in the past we've done some experimental work using gstreamer
for audio rendering in AmbulantPlayer (not the plugin), for use in
Nokia 770, also arm, also gstreamer based,<br>
for similar reasons as you mentioned (obtaining better audio
performance using HW accelerators). <br>
<br>
I think the old code is still there and there is still an option
--with-gstreamer<br>
in the ambulant configure script but it is old (4 years) and
unmaintained.<br>
However, there are a number of problems I know of.<br>
<br>
1. The Nokia N770/N800/N810/N900 platforms are not supported anymore by
the Ambulant team,<br>
because focus has shifted to other goals.<br>
2. The experimental gstreamer code is incomplete and probably buggy.<br>
For example, Pause/PlayStop does not work, and AmbulantPlayer (on
Nokia Nxxx) may crash.<br>
3. Many SMIL-3.0 features are not implemented and some of them cannot
be implemented using the<br>
gstreamer approach, for example transitions (fade etc.),
animations, clipBegin/clipEnd, and so on<br>
(at least at the time I could not see how to do that with
acceptable performance on these platforms).<br>
4. For a particular platform, in gstreamer terms, a specific pipeline
needs to be constructed.<br>
For the Nokia platforms cited an element called "dspmp3sink" was
needed to be used.<br>
For your platform, this is probably something different.<br>
5. Internally the ambulant API's have been changed quite a lot, s.t.
the gstreamer code most likely will<br>
not compile anymore.<br>
6. The same may be true for the gstreamer API's, at the time I worked
with it, it was a moving target.<br>
<br>
That said, the existing gstreamer code could be of some help for
interfacing with ambulant,<br>
but it will need quite some non-trivial programming to accomplish the
desired result.<br>
<br>
Sincerely,<br>
<br>
Kees Blom.<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
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