[FFmpeg-devel] [PATCH] avcodec/tak: reset filter buffers

[James Almer]

On 21/02/15 3:47 PM, Paul B Mahol wrote:
> On 2/21/15, James Almer <jamrial at gmail.com> wrote:
>> On 21/02/15 8:49 AM, Paul B Mahol wrote:
>>> Have you measured performance drop before and after?
>>
>> filter_order 8 in decorrelate()
>>
>> Before
>> 903 decicycles in scalarproduct, 8388364 runs, 244 skips
>> After
>> 858 decicycles in scalarproduct, 8388215 runs, 393 skips
>>
>>
>> filter_order 24 in decode_subframe()
>>
>> Before
>> 993 decicycles in scalarproduct, 16776849 runs, 367 skips
>> After
>> 887 decicycles in scalarproduct, 16776783 runs, 433 skips
>>
> 
> But what about other filter orders?

filter order 12 in decode_subframe()

Before
963 decicycles in scalarproduct, 8388426 runs, 182 skips
After
873 decicycles in scalarproduct, 8388410 runs, 198 skips


filter_order 8 in decode_subframe()

Before
900 decicycles in scalarproduct, 4194020 runs, 284 skips
After
858 decicycles in scalarproduct, 4194198 runs, 106 skips


filter order 4 in decode_subframe()

Before
827 decicycles in scalarproduct, 1048561 runs, 15 skips
After
876 decicycles in scalarproduct, 1048556 runs, 20 skips


Seems like only filter_order 4 is slower. I could leave the C code for that one 
case if you prefer.