[Mp4-tech] MPEG 4 Video Buffer problem

[Shailesh Sakri]

Hi,
     How do we manage the less handler condition while decoding  mp4 file.
     a) Say I have mp4 file in a 3gpp format. For first frame I get 3gpp
header in which i come to know the mp4 compressed frame length. Then the
actual mp4 (first frame->header+data)follows in bitstream. Now I have mp4
frame length of xbytes for a particular frame. I have a decoder internal
buffer of 'Y' bytes. How do i decide the max size of this internal buffer
such that Y>=x bytes always. I am defining internal buffer size Ybytes only
once in the Appopen. And all rest frames it is constant once defined for a
particular stream. Do i skip those frame where the frame size is more than
my internal buffer or keep a auxillary buffer where i copy remaining data
and then decode considering i have certain memory constrain. Is there any
max encoded data frame size for simple profile in mpeg4 codec?
And
    b)Say at a particular point of time I know from 3gpp header that current
frame size is x bytes. but only y bytes of data is available at that point
of time where y <x. How do i handle this less handler situation. do I copy
available data into internal buffer and wait for remaining data or start
decoding and exit with error condition as i  will not have entire encoded
stream to decode. This will adversely have effect on tht entire GOP of
frames and only synchup at next 'I' frame.
Rgds,
Shailesh
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