<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<meta name="Generator" content="Microsoft Word 14 (filtered medium)">
<!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:宋体;
panose-1:2 1 6 0 3 1 1 1 1 1;}
@font-face
{font-family:宋体;
panose-1:2 1 6 0 3 1 1 1 1 1;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:"\@宋体";
panose-1:2 1 6 0 3 1 1 1 1 1;}
@font-face
{font-family:Verdana;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
text-align:justify;
text-justify:inter-ideograph;
font-size:10.5pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.MsoAcetate, li.MsoAcetate, div.MsoAcetate
{mso-style-priority:99;
mso-style-link:"批注框文本 Char";
margin:0cm;
margin-bottom:.0001pt;
text-align:justify;
text-justify:inter-ideograph;
font-size:9.0pt;
font-family:"Calibri","sans-serif";}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.Char
{mso-style-name:"批注框文本 Char";
mso-style-priority:99;
mso-style-link:批注框文本;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";}
/* Page Definitions */
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 90.0pt 72.0pt 90.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="ZH-CN" link="blue" vlink="purple" style="text-justify-trim:punctuation">
<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-US">Hi, ffmpeg development team:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I'm a software developer of Lenovo Inc. I'm using ffmpeg in my video project for TS stream playing. While playing TS, cpu usage up to 90%, which in the
<b>image conversion process (YUV to RGB), cpu usageup to 25% -30%.</b><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">In my project, ffmpeg's image conversion call function
<span style="color:#0070C0">yuv2rgb_c_32</span> in C file <span style="color:#0070C0">
/libffmpeg/libswscale/yuv2rgb.c</span><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Here is source code:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">YUV2RGBFUNC(yuv2rgb_c_32, uint32_t, 0)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> LOADCHROMA(0);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> PUTRGB(dst_1, py_1, 0);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> PUTRGB(dst_2, py_2, 0);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> LOADCHROMA(1);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> PUTRGB(dst_2, py_2, 1);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> PUTRGB(dst_1, py_1, 1);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> LOADCHROMA(2);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> PUTRGB(dst_1, py_1, 2);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> PUTRGB(dst_2, py_2, 2);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> LOADCHROMA(3);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> PUTRGB(dst_2, py_2, 3);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> PUTRGB(dst_1, py_1, 3);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">ENDYUV2RGBLINE(8)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> LOADCHROMA(0);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> PUTRGB(dst_1, py_1, 0);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> PUTRGB(dst_2, py_2, 0);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> LOADCHROMA(1);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> PUTRGB(dst_2, py_2, 1);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> PUTRGB(dst_1, py_1, 1);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">ENDYUV2RGBFUNC()<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">With your please, I would like to ask some questions.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">a) Why the function writing by macro? <o:p>
</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">b) Whether the function can be optimized?
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">c) Has there some updates or new version?
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">d) Will ffmpeg have ARM platform specialized version or patch?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">My hardware is Sumsang Pad GT-P5110 (1G dural core, 1G RAM, 32G SD card), ffmpeg version is 0.11.1<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I'm glad and eager for your reply, thank you very much.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Best regards<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="533" style="width:399.65pt;margin-left:4.35pt;border-collapse:collapse">
<tbody>
<tr>
<td width="202" valign="top" style="width:151.6pt;padding:0cm 0cm 0cm 0cm">
<p class="MsoNormal" align="left" style="text-align:left;page-break-after:avoid;text-autospace:none">
<span lang="EN-US" style="font-size:8.0pt;font-family:"Verdana","sans-serif";color:#004080"><o:p> </o:p></span></p>
</td>
<td width="142" valign="top" style="width:106.3pt;padding:0cm 0cm 0cm 0cm">
<p class="MsoNormal" align="left" style="text-align:left;page-break-after:avoid;text-autospace:none">
<span lang="EN-US" style="font-size:8.0pt;font-family:"Verdana","sans-serif";color:#004080"><o:p> </o:p></span></p>
</td>
<td width="189" rowspan="2" style="width:5.0cm;padding:0cm 0cm 0cm 0cm">
<p class="MsoNormal" align="left" style="text-align:left;page-break-after:avoid;text-autospace:none">
<span lang="EN-US" style="font-size:8.0pt;font-family:"Verdana","sans-serif";color:#004080"><o:p> </o:p></span></p>
</td>
</tr>
<tr>
<td width="344" colspan="2" valign="top" style="width:257.9pt;padding:0cm 0cm 0cm 0cm">
<p class="MsoNormal" align="left" style="text-align:left;page-break-after:avoid;text-autospace:none">
<b><span lang="EN-US" style="font-family:"Verdana","sans-serif";color:#004080">Regards,<o:p></o:p></span></b></p>
<p class="MsoNormal" align="left" style="text-align:left;page-break-after:avoid;text-autospace:none">
<b><span lang="EN-US" style="font-family:"Verdana","sans-serif";color:#004080"><o:p> </o:p></span></b></p>
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="533" style="width:399.65pt;margin-left:4.35pt;border-collapse:collapse">
<tbody>
<tr>
<td width="202" valign="top" style="width:151.6pt;padding:0cm 0cm 0cm 0cm">
<p class="MsoNormal" align="left" style="text-align:left;page-break-after:avoid;text-autospace:none">
<b><span style="font-size:10.0pt;font-family:宋体;color:#004080">李凯</span></b><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#004080"> Li Kai<o:p></o:p></span></b></p>
<p class="MsoNormal" align="left" style="text-align:left;page-break-after:avoid;text-autospace:none">
<b><span lang="EN-US" style="font-size:8.0pt;font-family:"Verdana","sans-serif";color:red">S</span></b><span lang="EN-US" style="font-size:8.0pt;font-family:"Verdana","sans-serif";color:#004080">ystem
</span><b><span lang="EN-US" style="font-size:8.0pt;font-family:"Verdana","sans-serif";color:red">I</span></b><span lang="EN-US" style="font-size:8.0pt;font-family:"Verdana","sans-serif";color:#004080">nnovation
</span><b><span lang="EN-US" style="font-size:8.0pt;font-family:"Verdana","sans-serif";color:red">L</span></b><span lang="EN-US" style="font-size:8.0pt;font-family:"Verdana","sans-serif";color:#004080">ab<br>
Lenovo, R&T<br>
No.6 Shangdi West Road Haidian District, Beijing<o:p></o:p></span></p>
</td>
<td width="142" valign="top" style="width:106.3pt;padding:0cm 0cm 0cm 0cm">
<p class="MsoNormal" align="left" style="text-align:left;page-break-after:avoid;text-autospace:none">
<span lang="EN-US" style="font-size:8.0pt;font-family:"Verdana","sans-serif";color:#004080"><br>
</span><u><span lang="EN-US" style="font-size:8.0pt;font-family:"Verdana","sans-serif";color:#1F497D"><a href="mailto:likai2@lenovo.com"><span style="color:#1F497D">likai2@lenovo.com</span></a></span></u><span lang="EN-US" style="font-size:8.0pt;font-family:"Verdana","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left;page-break-after:avoid;text-autospace:none">
<span lang="EN-US" style="font-size:8.0pt;font-family:"Verdana","sans-serif";color:#004080">(TEL) +86 10-58861550<br>
(FAX) +86 10-58863357<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left;page-break-after:avoid;text-autospace:none">
<span lang="EN-US" style="font-size:8.0pt;font-family:"Verdana","sans-serif";color:#004080"><o:p> </o:p></span></p>
</td>
<td width="189" rowspan="2" style="width:5.0cm;padding:0cm 0cm 0cm 0cm">
<p class="MsoNormal" align="right" style="text-align:right;page-break-after:avoid;text-autospace:none">
<span lang="EN-US" style="font-size:8.0pt;font-family:"Verdana","sans-serif";color:#004080"><img border="0" width="184" height="61" id="图片_x0020_2" src="cid:image001.png@01CE1BF3.650A9BC0" alt="说明: 说明: 说明: 说明: 说明: cid:image003.png@01CD86C6.364B3F00"><o:p></o:p></span></p>
</td>
</tr>
<tr>
<td width="344" colspan="2" valign="top" style="width:257.9pt;padding:0cm 0cm 0cm 0cm">
<p class="MsoNormal" align="left" style="text-align:left;page-break-after:avoid;text-autospace:none">
<span lang="EN-US" style="font-size:8.0pt;font-family:"Verdana","sans-serif";color:#004080"><a href="http://www.lenovo.com/"><span style="color:#FF8100">www.Lenovo.com</span></a><o:p></o:p></span></p>
</td>
</tr>
</tbody>
</table>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left;page-break-after:avoid;text-autospace:none">
<b><span lang="EN-US" style="font-family:"Verdana","sans-serif";color:#004080"><o:p> </o:p></span></b></p>
</td>
</tr>
</tbody>
</table>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
</div>
</body>
</html>