<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><br></div><div>On Thu, 10 Mar 2011, TJ Harris observed:</div><div><br></div><div><blockquote type="cite"><div>- Top CPU user in both 1080i and 720p was mmx_i420_2vuy color<br>conversion. Kind of surprising that it isn't done in hardware.<br></div></blockquote><div><br></div><div><br></div><div>Used to be. In late 2004, Jeremiah worked out how to get QuickTime</div><div>to do it in hardware, and the code was in there until late 2006,</div><div>when Mac OS X moved from PPC to Intel hardware.</div><div><br></div><div><br></div><div>The Intel QuickTime code crashed when fed <span class="Apple-style-span" style="font-family: monospace; ">YUV420 data.</span></div><div><span class="Apple-style-span" style="font-family: monospace; ">I created an Apple </span><span class="Apple-style-span" style="font-family: monospace; ">bug ID (</span><span class="Apple-style-span" style="font-family: monospace; ">4731762), but never got time</span></div><div><span class="Apple-style-span" style="font-family: monospace; ">to prove the bug to them. In the end, it was much</span></div><div><span class="Apple-style-span" style="font-family: monospace; ">easier to </span><span class="Apple-style-span" style="font-family: monospace; ">remove the QuickTime colour conversion.</span></div><div><span class="Apple-style-span" style="font-family: monospace; ">(made the code simpler, and any Core Duo CPU had</span></div><div><span class="Apple-style-span" style="font-family: monospace; "> ample grunt to SW convert). Haven't re-visited that bug.</span></div><div><br></div><div><br></div><div><br></div><div>Not sure how OpenGL does it.</div><div><br></div><br><blockquote type="cite"><div>- nvChannel::waitForTimeStamp was present on both, but much higher<br>CPU usage at 720p (2.8% vs 0.8%)<br></div></blockquote><div><br></div><div>Hmmm. I don't know what is invoking that (not our code).</div><div><br></div><div><br></div><div>Does running an external (CRT?) display</div><div>at different refresh rates affect this?</div></div><br><div>
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Monaco; font-size: 10px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Monaco; font-size: 10px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Monaco; font-size: 10px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Monaco; font-size: 10px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Monaco; font-size: 10px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div style="font-family: Helvetica; font-size: 12px; "><font class="Apple-style-span" face="Monaco" size="2"><span class="Apple-style-span" style="font-size: 10px; ">--</span></font></div><div style="font-family: Helvetica; font-size: 12px; "><font class="Apple-style-span" face="Monaco" size="2"><span class="Apple-style-span" style="font-size: 10px; ">Nigel Pearson, nigel@ind.tansu.com.au|"Look at this! |</span></font></div><div style="font-family: Helvetica; font-size: 12px; "><font class="Apple-style-span" face="Monaco" size="2"><span class="Apple-style-span" style="font-size: 10px; ">Telstra Net. Eng., Sydney, Australia | Do you think I put this in|</span></font></div><div style="font-family: Helvetica; font-size: 12px; "><font class="Apple-style-span" face="Monaco" size="2"><span class="Apple-style-span" style="font-size: 10px; ">Office: 9202 3900 Fax: 9212 6348 | to get better reception? |</span></font></div><div style="font-family: Helvetica; font-size: 12px; "><font class="Apple-style-span" face="Monaco" size="2"><span class="Apple-style-span" style="font-size: 10px; ">Mobile: 0408 664435 Home: 9792 6998 | Batty - Fern Gully |</span></font></div></span></span></span></span></span></span>
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