[FFmpeg-cvslog] ac3enc: use MUL64() to multiply fixed-point coefficients

Justin Ruggles justin.ruggles
Wed Mar 9 22:27:26 CET 2011

On 03/09/2011 04:07 PM, Justin Ruggles wrote:

> On 03/09/2011 02:05 PM, Michael Niedermayer wrote:
>> The output of the MDCT should be more than 16bit.
>> If thats not the case theres some quality that could be gained, at least at
>> the high bitrate side IMHO
> Hmmm... you bring up a good point about quality though.  The final
> post-rotation does CMUL() which right shifts by 15.  We could possibly
> gain some quality by having the post-rotation not right shift and adjust
> the coefficient scaling accordingly.




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