Regarding 3gp2 parser and EVRC decoder

by chn » Fri, 23 Jan 2009 07:18:38 GMT

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I have integrated my EVRC decoder into the opencore. Currently, there
already exists 3gp2 parser in the opencore. I tried to play 3g2 file
with EVRC audio codec having box type of EVRC Sample entry as 'sevc'
but it failed.
1. Does this 3gp2 parser support EVRC decoder?


Regarding 3gp2 parser and EVRC decoder

by Dave Sparks » Fri, 23 Jan 2009 07:37:59 GMT

 Perhaps PV can give you a definitive answer, but I don't recall them
ever mentioning having support for EVRC. You'll probably need to do
some hacking on the parser to recognize the stream type and
instantiate your codec.


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Regarding 3gp2 parser and EVRC decoder

by scs sek » Fri, 23 Jan 2009 10:33:09 GMT

 Hi All,

When i integrate QCELP decoder, 3gp2 parser is able to parse the QCELP
stream with mp4 atom.

Will mp4 atom include EVRC also? or only 'sevrc' is the box for evrc?


Regarding 3gp2 parser and EVRC decoder

by giri » Mon, 26 Jan 2009 19:52:51 GMT

 PV MP4 FF parser tha is part of opencore does not support 3gp2
fileformat or codecs. 3GP2 defines sample entries for their codecs
(QCELP, EVRC etc). So you would need to modify the parser to parse
these sample entries and add support for these codec types across the
node etc.


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