Vorbis dev - Sep 2004 - Vorbis decoder sample code

Hi,

I'm a Pocket PC developer and have created a audio translator application on
this platform. I currently make use of
an MP3 decoder engine, but due to heavy licensing fees I'm thinking of
switching over to a patent free format.
Vorbis presents the best approach. 

I read that tremor decoder has been especially optimized for embedded devices.
I'd like to make use of
this and incorporate Vorbis decoder within my application. 
In my app I just want to decode the encoded files, and play them OutLoud.
But I don't know where to begin. I'd appreciate if anyone can provide
some pointers towards
sample Vorbis decoder source code, and its subsequent playback to wav files.
Any simple decoder code would be greatly appreciated.

Has anyone implemented a Vorbis decoder on the Pocket PC platform. I'd be
grateful if someone could provide
me a link towards its source code.

Thanks & regards,
Asheesh



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Vorbis decoder sample code
"Asheesh Vashishtha" wrote...
> I'm a Pocket PC developer and have created a audio translator
application
> on this platform. I currently make use of
> an MP3 decoder engine, but due to heavy licensing fees I'm thinking of 
> switching over to a patent free format.
> Vorbis presents the best approach.
You may want to take a look at Speex.  It has the same type of licensing as 
Vorbis but is designed specifically to encode human speech where as Vorbis 
is a more general audio encoder.


Atamido

Thanks for your reply, Paul, but I've already ported Speex onto PocketPC
platform but considering that my earlier files were
in mp3 the audio quality is ok but not comparable to that of mp3. Vorbis is even
better at lower bitrates w.r.t mp3,
which is why I'd like to try vorbis as well. If it sounds better than Speex
than I'd go in for vorbis.

Moreover, there are portions of Speex which are still perform floating point
operations while tremor is a completely fixed point implementation, so would
like to go for that.
Can you help me in providing the source code for that.

Thanks &regards,
Asheesh
-----Original Message-----
From: Paul Bryson [mailto:paul@msn.com]
Sent: Tuesday, September 21, 2004 8:04 PM
To: Asheesh Vashishtha
Subject: Re: Vorbis decoder sample code


Vorbis decoder sample code
"Asheesh Vashishtha" wrote...
> I'm a Pocket PC developer and have created a audio translator
application
> on this platform. I currently make use of
> an MP3 decoder engine, but due to heavy licensing fees I'm thinking of 
> switching over to a patent free format.
> Vorbis presents the best approach.
You may want to take a look at Speex.  It has the same type of licensing as 
Vorbis but is designed specifically to encode human speech where as Vorbis 
is a more general audio encoder.


Atamido

On Tue, Sep 21, 2004 at 07:21:41PM +0530, Asheesh Vashishtha wrote:
> I read that tremor decoder has been especially optimized for embedded
devices. I'd like to make use of
> this and incorporate Vorbis decoder within my application. 
> In my app I just want to decode the encoded files, and play them OutLoud.
> But I don't know where to begin. I'd appreciate if anyone can
provide some pointers towards
> sample Vorbis decoder source code, and its subsequent playback to wav
files.
> Any simple decoder code would be greatly appreciated.
The latest tremor code is in (subversion) revision control at 

  http://svn.xiph.org/branches/lowmem-branch/Tremor/

This is a webdav url; you can mount it directly if you don't want to 
fiddle with svn.
> Has anyone implemented a Vorbis decoder on the Pocket PC platform. I'd
be grateful if someone could provide
> me a link towards its source code.
Oh probably, but the included ivorbisfile_example code should be enough 
to get you started. Not that Tremor has some arm optimizations, but not 
really anything else at this point.

Hope that helps,
 -r

On Tue, 21 Sep 2004, Ralph Giles wrote:
> Oh probably, but the included ivorbisfile_example code should be enough 
> to get you started. Not that Tremor has some arm optimizations, but not 
> really anything else at this point.
Tremor actually does have ARM optimizations already.  They require gcc 
to be used though.


Nicolas

Hello all,

I'm trying to create Vorbis tremor decoder using tremor library, but the
example I'm following is of the code
written in oggdec.c.
However in tremor files, I also found a ivorbisfile_example.c file as well.

There is quite a bit of difference in the implementation of the 2 decoders I
believe.
I'm not sure about this since I'm just getting started with it.
Please help as I'm not able to compile the oggdec sample with tremor
library.
is oggdec based on libvorbis, and the other example based on tremor library?
Am I doing something wrong? Any help would be deeply appreciated?

I'm using eVC++ 4.0 to compile the vorbis decoder for Pocket PC. 

Regards,
Asheesh 

-----Original Message-----
From: Asheesh Vashishtha 
Sent: Tuesday, September 21, 2004 8:28 PM
To: 'vorbis-dev@xiph.org'
Subject: RE: Vorbis decoder sample code


Thanks for your reply, Paul, but I've already ported Speex onto PocketPC
platform but considering that my earlier files were
in mp3 the audio quality is ok but not comparable to that of mp3. Vorbis is even
better at lower bitrates w.r.t mp3,
which is why I'd like to try vorbis as well. If it sounds better than Speex
than I'd go in for vorbis.

Moreover, there are portions of Speex which are still perform floating point
operations while tremor is a completely fixed point implementation, so would
like to go for that.
Can you help me in providing the source code for that.

Thanks &regards,
Asheesh
-----Original Message-----
From: Paul Bryson [mailto:paul@msn.com]
Sent: Tuesday, September 21, 2004 8:04 PM
To: Asheesh Vashishtha
Subject: Re: Vorbis decoder sample code


Vorbis decoder sample code
"Asheesh Vashishtha" wrote...
> I'm a Pocket PC developer and have created a audio translator
application
> on this platform. I currently make use of
> an MP3 decoder engine, but due to heavy licensing fees I'm thinking of 
> switching over to a patent free format.
> Vorbis presents the best approach.
You may want to take a look at Speex.  It has the same type of licensing as 
Vorbis but is designed specifically to encode human speech where as Vorbis 
is a more general audio encoder.


Atamido

Hi,
I've managed to compile the oggdec sample using tremor library after ironing
out the VC++ issues, thanks to
you all guys. The oggdec doesn't decode the input ogg file properly.

For a 27kb ogg file, it just outputs a 1kb wav file, and that too corrupt. No
sound, and nothing.
I checked up with the code as well, and it runs fine without any error but at
the end of the decoding cycle,
a corrupted wav file is produced. Has anyone else faced this problem?

I'd appreciate any help in this regard.

Thanks & regards,
Asheesh


-----Original Message-----
From: vorbis-dev-bounces@xiph.org [mailto:vorbis-dev-bounces@xiph.org]On
Behalf Of Dominik Kuhlen
Sent: Wednesday, September 22, 2004 1:31 PM
To: vorbis-dev@xiph.org
Subject: Re: [Vorbis-dev] RE: Vorbis decoder sample code


Hi,
On Wednesday 22 September 2004 09:15, Asheesh Vashishtha
wrote:
> Hello all,
>
> I'm trying to create Vorbis tremor decoder using tremor library, but
the
> example I'm following is of the code written in oggdec.c.
> However in tremor files, I also found a ivorbisfile_example.c file as well.
>
> There is quite a bit of difference in the implementation of the 2 decoders
> I believe. I'm not sure about this since I'm just getting started
with it.
> Please help as I'm not able to compile the oggdec sample with tremor
> library. is oggdec based on libvorbis, and the other example based on
> tremor library? Am I doing something wrong? Any help would be deeply
> appreciated?
ivorbisfile_example.c is shipped with tremor source code. This is probably the 
most simple decoder, hence the best to start with.
>
> I'm using eVC++ 4.0 to compile the vorbis decoder for Pocket PC.
Hmm, I don't know much about this but using a gcc would cause fewer
headaches (my experience with symbian-emulator using vc++).

Dominik

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