<html><head><meta http-equiv="Content-Type" content="text/html charset=euc-kr"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><p style="margin: 0px 0px 24px; font-size: 13px; color: rgb(50, 51, 51); ">Hi~<br>
My name is James. (<a href="mailto:sunggwon@4nb.co.kr">sunggwon@4nb.co.kr</a>)<br>
I am a iOS developer.<br>
My app need sound codec. (1 encoding & 32 decoding at the same time)<br>
So i used speex codec.<br>
But codec¡¯s performance was lower than my expectation.<br>
Is it normal ? or did i do something wrong ?</p><p style="margin: 0px 0px 24px; font-size: 13px; color: rgb(50, 51, 51); ">* cpu usage test of speex codec on iPad2. (tested by xcode instruments)<br>
=========================================================<br>
## encoder test<br>
a) 1 encoding (VBR, Quality=10, Complexity=2)<br>
<span class="Apple-tab-span" style="white-space:pre"> </span>avg<span class="Apple-tab-span" style="white-space:pre"> </span>: 26 ~ 28 %<br>
<span class="Apple-tab-span" style="white-space:pre"> </span>peak<span class="Apple-tab-span" style="white-space:pre"> </span>: 38 %<br>
b) 1 encoding (VBR, Quality=0, Complexity=1)<br>
<span class="Apple-tab-span" style="white-space:pre"> </span>avg<span class="Apple-tab-span" style="white-space:pre"> </span>: 14 ~ 16 %<br>
<span class="Apple-tab-span" style="white-space:pre"> </span>peak<span class="Apple-tab-span" style="white-space:pre"> </span>: 20 %<br>
c) 1 encoding (VBR, Quality=1, Complexity=10)<br>
<span class="Apple-tab-span" style="white-space:pre"> </span>avg<span class="Apple-tab-span" style="white-space:pre"> </span>: 14 ~ 22 %<br>
<span class="Apple-tab-span" style="white-space:pre"> </span>peak<span class="Apple-tab-span" style="white-space:pre"> </span>: 30 %<br>
d) 1 encoding (VBR, Quality=10, Complexity=10)<br>
<span class="Apple-tab-span" style="white-space:pre"> </span>avg<span class="Apple-tab-span" style="white-space:pre"> </span>: 26 ~ 76 %<br>
<span class="Apple-tab-span" style="white-space:pre"> </span>peak<span class="Apple-tab-span" style="white-space:pre"> </span>: 94 %<br>
e) 1 encoding (CBR, Quality=10, Complexity=2)<br>
<span class="Apple-tab-span" style="white-space:pre"> </span>avg<span class="Apple-tab-span" style="white-space:pre"> </span>: 30 %<br>
<span class="Apple-tab-span" style="white-space:pre"> </span>peak<span class="Apple-tab-span" style="white-space:pre"> </span>: 40 %<br>
f) 1 encoding (CBR, Quality=0, Complexity=1)<br>
<span class="Apple-tab-span" style="white-space:pre"> </span>avg<span class="Apple-tab-span" style="white-space:pre"> </span>: 14 %<br>
<span class="Apple-tab-span" style="white-space:pre"> </span>peak<span class="Apple-tab-span" style="white-space:pre"> </span>: 20 %</p><p style="margin: 0px 0px 6px; font-size: 13px; color: rgb(50, 51, 51); ">## decoder test (used encoding source: VBR, Quality=10, Complexity=2)</p><p style="margin: 0px 0px 6px; font-size: 13px; color: rgb(50, 51, 51); ">a) 1 decoding</p><p style="margin: 0px 0px 6px; font-size: 13px; color: rgb(50, 51, 51); "><span class="Apple-tab-span" style="white-space:pre"> </span>avg<span class="Apple-tab-span" style="white-space:pre"> </span>: 6 ~ 8 %</p><p style="margin: 0px 0px 6px; font-size: 13px; color: rgb(50, 51, 51); ">b) 10 decodings</p><p style="margin: 0px 0px 6px; font-size: 13px; color: rgb(50, 51, 51); "><span class="Apple-tab-span" style="white-space:pre"> </span>avg<span class="Apple-tab-span" style="white-space:pre"> </span>: 58 ~ 72 %</p><p style="margin: 0px 0px 6px; font-size: 13px; color: rgb(50, 51, 51); "><span class="Apple-tab-span" style="white-space:pre"> </span>peak<span class="Apple-tab-span" style="white-space:pre"> </span>: 82 %</p><p style="margin: 0px 0px 24px; font-size: 13px; color: rgb(50, 51, 51); ">=========================================================</p><p style="margin: 0px 0px 6px; font-size: 13px; color: rgb(50, 51, 51); ">Can you tell me any advice or some information ?<br>
Thanks.</p><p style="margin: 0px 0px 6px; font-size: 13px; color: rgb(50, 51, 51); min-height: 16px; "><br></p></body></html>