[FFmpeg-devel] [PATCH] AAC encoder: refactor to resynchronize MIPS port

[James Almer]

On 9/15/2015 4:24 AM, Claudio Freire wrote:
> This patch refactors the AAC coders to reuse code
> between the MIPS port and the regular, portable C code.
> There were two main functions that had to use
> hand-optimized versions of quantization code:
>  - search_for_quantizers_twoloop
>  - codebook_trellis_rate
> 
> Those two were split into their own template header
> files so they can be inlined inside both the MIPS port
> and the generic code. In each context, they'll link
> to their specialized implementations, and thus be
> optimized by the compiler.
> 
> This approach I believe is better than maintaining
> several copies of each function. As past experience has
> proven, having to keep those in sync was error prone.
> In this way, they will remain in sync by default.
> 
> Also, an implementation of the reconstructed output
> argument for the optimized quantize_and_encode
> functions is included in the patch. While the current
> implementation of search_for_pred still isn't using
> it, future iterations of main prediction probably will.
> It should not imply any measurable performance hit while
> not being used.
> 
> 
> Patch attached.

This broke make checkheaders, since the new headers are purposely
missing functions like abs_pow34_v() when compiled standalone.
http://fate.ffmpeg.org/log.cgi?time=20150918161151&log=compile&slot=x86_64-archlinux-gcc-checkheaders