MPEG4 decoder testing

Hi all

I am working on the MPEG4 AAC decoder . I have xxx.mp4 test vectors
but the decoder I have accepts only ADIF , ADTS formats.

So I am unable to do the testing, can some one let me know how do I test the
decoder.
If we need to convert the xx.mp4 files to adts of adif to test where do I
find the utility for the same.

Were do I get an rms calculating utility for this codec and whats the
maximum tollerable
rms value for this decoder(If any on has the rms utility for the same please
send it across
if its not a problem )

If anyone has knows the links from were I can get an fixed point version og
the aac codec(open source )please let me know.

Thanks
Mohan
m...@gmail.com Start a New Thread

Hi Mohan...

To test the decoder you should first convert the.mp4 file into .aac
file.To do this conversion u can search for parser utilities
like Yamb etc.... which do extaction from container file.Hope this will help
you...
Regards
Gomathi.

-----Original Message-----
From: a... [mailto:a...]On Behalf
Of Mohan Reddy
Sent: Tuesday, July 03, 2007 6:45 PM
To: a...
Subject: {Disarmed} [audiodsp] MPEG4 decoder testing

Hi all

I am working on the MPEG4 AAC decoder . I have xxx.mp4 test vectors
but the decoder I have accepts only ADIF , ADTS formats.

So I am unable to do the testing, can some one let me know how do I test
the decoder.
If we need to convert the xx.mp4 files to adts of adif to test where do I
find the utility for the same.

Were do I get an rms calculating utility for this codec and whats the
maximum tollerable
rms value for this decoder(If any on has the rms utility for the same
please send it across
if its not a problem )

If anyone has knows the links from were I can get an fixed point version
og the aac codec(open source )please let me know.
Thanks
Mohan
m...@gmail.com Start a New Thread

Hi Mohan,

I am working on the MPEG4 AAC decoder. I have xxx.mp4 test vectors
but the decoder I have accepts only ADIF, ADTS formats. So I am unable to
do the testing, can some one let me know how do I test the decoder.
If we need to convert the xx.mp4 files to adts of adif to test where do I
find the utility for the same.

> You need to add the support for mp4 parser to your decoder to decode xxx.mp4 file. The parser format is
subpart part of MPEG4 specification (14496-12 and 14496-14) . You need to purchase this one from the ISO store.
Here is the link where you can purchase these standards.

- http://www.iso.ch/iso/en/CombinedQueryResult.CombinedQueryResult?queryString496-14
- http://www.iso.ch/iso/en/CombinedQueryResult.CombinedQueryResult?queryString496-12
Were do I get an rms calculating utility for this codec and whats the maximum tollerable
rms value for this decoder(If any on has the rms utility for the same please send it across
if its not a problem )

> You can refer ISO/IEC 13818-4 and ISO/IEC 14496-4 standards to know more information about rms calculations
and test procedures. If you download the ISO mpeg4 software package, rmsdiff utility is coming along with that package.

If anyone has knows the links from were I can get an fixed point version og the aac codec(open source )please let me know.
> FAAD is a opensource decoder supports both fixed point and floating point version.
refer this link for more information http://www.audiocoding.com/modules/mydownloads/
Best Regards,
For VINJEY Software Systems Pvt Ltd
Senthil.
----- Original Message -----
From: Mohan Reddy
To: a...
Sent: Tuesday, July 03, 2007 6:44 PM
Subject: [audiodsp] MPEG4 decoder testing

Hi all

I am working on the MPEG4 AAC decoder . I have xxx.mp4 test vectors
but the decoder I have accepts only ADIF , ADTS formats.

So I am unable to do the testing, can some one let me know how do I test the decoder.
If we need to convert the xx.mp4 files to adts of adif to test where do I find the utility for the same.

Were do I get an rms calculating utility for this codec and whats the maximum tollerable
rms value for this decoder(If any on has the rms utility for the same please send it across
if its not a problem )

If anyone has knows the links from were I can get an fixed point version og the aac codec(open source )please let me know.
Thanks
Mohan
m...@gmail.com Start a New Thread

Dear Mohan,

For testing your decoder, you need to give input files in .aac extension. You can convert your files from .mp4 to .aac using the mp4ui utility. It can be found at:

http://mp4ui.sourceforge.net/

For fixed point version of the codec, you can use FAAD (Free Advanced Audio Decoder).

Regards,
abhishek

Mohan Reddy wrote:

Hi all
I am working on the MPEG4 AAC decoder . I have xxx.mp4 test vectors
but the decoder I have accepts only ADIF , ADTS formats.
So I am unable to do the testing, can some one let me know how do I test the decoder.
If we need to convert the xx.mp4 files to adts of adif to test where do I find the utility for the same.
Were do I get an rms calculating utility for this codec and whats the maximum tollerable
rms value for this decoder(If any on has the rms utility for the same please send it across
if its not a problem )
If anyone has knows the links from were I can get an fixed point version og the aac codec(open source )please let me know.

Thanks
Mohan
m...@gmail.com Start a New Thread