AAC-lc encoder |
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AAC-lc encoder |
 Nov 29 2011, 15:32
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#1
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Group: Members Posts: 1 Joined: 29-November 11 Member No.: 95478  |
Hi all,
I have started porting aac-lc encoder to one of DSP processor. I started with IEC code it is taking around 300KB of memory. Psychoaccoustic model is occupying more than 100KB. are there any better models. also i have some doubt on frame length. can i have a frame length of lesser size( ex 512) than original ( 1024). and i will have my short frame length by 8 ( i.e 64). and will iterate the loop twice,and then will pack the bitstream . are there any better ways to optimize the memory of the aac-lc encoder. |
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Nov 29 2011, 17:49
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#2
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 Server Admin Group: Admin Posts: 4808 Joined: 24-September 01 Member No.: 13 |
AAC frame sizes are fixed by the standard, read the ISO spec.
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Nov 30 2011, 17:36
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#3
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Group: Members Posts: 56 Joined: 19-January 11 Member No.: 87451 |
300 KB is too much memory.. I think you can refer to some open source codecs like faac for this.
Regarding your second question : You cannot change the frame size of AAC For LC its 1024 for long windows and 128 for short windows and its fixed AAC LD has a frame size of 512 to give it a low delay and it doesnt have any short windows. Hope this helps.. 
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