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List: kde-multimedia
Subject: Re: Review Request 112076: Fix bug where monitor won't powersave even with only audio content
From: "Harald Sitter" <sitter () kde ! org>
Date: 2014-01-17 9:01:39
Message-ID: 20140117090139.22966.21506 () probe ! kde ! org
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https://git.reviewboard.kde.org/r/112076/#review47557
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src/app/mainWindow.cpp
<https://git.reviewboard.kde.org/r/112076/#comment33778>
While super lovely, this unfortunately suffers from the problem I outlined in a \
comment for review5. Essentially video availability is async and independent of \
state change. Namely hasVideo doesn't need to be true when entering PlayingState (in \
fact it mostly isn't with Phonon VLC). So doing the static hasVideo is not \
sufficient. Instead engineHasVideoChanged() needs to be utilized in some form or \
fashion (wired up to Phonon, slot is called whenever hasVideo changed).
My original comment from back then was:
What I just remembered though... Phonon dispatches this information as a signal \
(i.e. state changes to playing; 3 seconds later; signal for hasVideoChanged arrives \
indicating this is audio-only content), so checking hasVideo() at the time of state \
change can lead to wrong behavior (e.g. hasVideo=false; 3 seconds later; \
hasVideo=true).
So yes, likely engineHasVideoChanged() is where you want to have additional \
logic.
Perhaps something like this:
new function MainWindow::inhibitSleep() [example name :S; contains sleep logic \
from inhibitPowersave()] new function MainWindow::releaseSleep() [contains release \
for sleep logic from releasePowersave()[] new function \
MainWindow::inhibitScreenSleep() [contains screen power management from \
inhibitPowersave()] new function MainWindow::releaseScreenSleep() [contains release \
for screen power management from releasePowersave()] remove function \
MainWindow::inhibitPowersave() [release can be kept around as convenience function) \
MainWindow::engineStateChanged(...) calls MainWindow::inhibitSleep() [assumption: we \
always want to prevent sleeping] MainWindow::engineHasVideoChanged(...) it calls \
MainWindow::inhibitScreenSleep() if hasVideo=true, or calls \
MainWindow::releaseScreenSleep() if hasVideo=no [overall condition: state must be \
playing] [on state change to !playing we continue to call releasePowersave(), which \
in turn calls both releseSleep() and releaseScreenSleep()]
ultimate result is then that we always prevent sleeping
- Harald Sitter
On Jan. 16, 2014, 11:26 a.m., James Smith wrote:
>
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/112076/
> -----------------------------------------------------------
>
> (Updated Jan. 16, 2014, 11:26 a.m.)
>
>
> Review request for KDE Multimedia and Harald Sitter.
>
>
> Repository: dragon
>
>
> Description
> -------
>
> Fixes an issue where playing audio content keeps the screen awake. Video content is \
> supposed to, but with the new play URL button, dragon should allow the monitor to \
> turn off.
>
> Diffs
> -----
>
> src/app/mainWindow.cpp f850820
>
> Diff: https://git.reviewboard.kde.org/r/112076/diff/
>
>
> Testing
> -------
>
> Compile, run-test
>
>
> Thanks,
>
> James Smith
>
>
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This is an automatically generated e-mail. To reply, visit:
<a href="https://git.reviewboard.kde.org/r/112076/">https://git.reviewboard.kde.org/r/112076/</a>
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font-size: 9pt; padding: 4px 8px; text-align: left;"> <a \
href="https://git.reviewboard.kde.org/r/112076/diff/9/?file=234120#file234120line868" \
style="color: black; font-weight: bold; text-decoration: \
underline;">src/app/mainWindow.cpp</a> <span style="font-weight: normal;">
(Diff revision 9)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; \
">MainWindow::keyPressEvent( QKeyEvent *e )</pre></td>
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<th bgcolor="#e9eaa8" style="border-right: 1px solid #C0C0C0;" \
align="right"><font size="2">868</font></th> <td bgcolor="#fdfebc" width="50%"><pre \
style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> \
<span class="p">(</span><span class="n">m_stopScreenPowerMgmtCookie</span> <span \
class="o">==</span> <span class="o">-</span><span class="mi">1</span><span \
class="p"><span class="hl">)</span></span></pre></td> <th bgcolor="#e9eaa8" \
style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" \
align="right"><font size="2">868</font></th> <td bgcolor="#fdfebc" width="50%"><pre \
style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> \
<span class="p">(</span><span class="n">m_stopScreenPowerMgmtCookie</span> <span \
class="o">==</span> <span class="o">-</span><span class="mi">1</span><span \
class="hl"> </span><span class="o"><span class="hl">&&</span></span><span \
class="hl"> </span><span class="n"><span class="hl">TheStream</span></span><span \
class="o"><span class="hl">::</span></span><span class="n"><span \
class="hl">hasVideo</span></span><span class="p"><span \
class="hl">())</span></span></pre></td> </tr>
</tbody>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; \
white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">While super \
lovely, this unfortunately suffers from the problem I outlined in a comment for \
review5. Essentially video availability is async and independent of state change. \
Namely hasVideo doesn't need to be true when entering PlayingState (in fact it \
mostly isn't with Phonon VLC). So doing the static hasVideo is not sufficient. \
Instead engineHasVideoChanged() needs to be utilized in some form or fashion (wired \
up to Phonon, slot is called whenever hasVideo changed).
My original comment from back then was:
What I just remembered though... Phonon dispatches this information as a signal (i.e. \
state changes to playing; 3 seconds later; signal for hasVideoChanged arrives \
indicating this is audio-only content), so checking hasVideo() at the time of state \
change can lead to wrong behavior (e.g. hasVideo=false; 3 seconds later; \
hasVideo=true).
So yes, likely engineHasVideoChanged() is where you want to have additional logic.
Perhaps something like this:
new function MainWindow::inhibitSleep() [example name :S; contains sleep logic from \
inhibitPowersave()] new function MainWindow::releaseSleep() [contains release for \
sleep logic from releasePowersave()[] new function MainWindow::inhibitScreenSleep() \
[contains screen power management from inhibitPowersave()] new function \
MainWindow::releaseScreenSleep() [contains release for screen power management from \
releasePowersave()] remove function MainWindow::inhibitPowersave() [release can be \
kept around as convenience function) MainWindow::engineStateChanged(...) calls \
MainWindow::inhibitSleep() [assumption: we always want to prevent sleeping] \
MainWindow::engineHasVideoChanged(...) it calls MainWindow::inhibitScreenSleep() if \
hasVideo=true, or calls MainWindow::releaseScreenSleep() if hasVideo=no [overall \
condition: state must be playing] [on state change to !playing we continue to call \
releasePowersave(), which in turn calls both releseSleep() and releaseScreenSleep()]
ultimate result is then that we always prevent sleeping </pre>
</div>
<br />
<p>- Harald Sitter</p>
<br />
<p>On January 16th, 2014, 11:26 a.m. UTC, James Smith wrote:</p>
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<td>
<div>Review request for KDE Multimedia and Harald Sitter.</div>
<div>By James Smith.</div>
<p style="color: grey;"><i>Updated Jan. 16, 2014, 11:26 a.m.</i></p>
<div style="margin-top: 1.5em;">
<b style="color: #575012; font-size: 10pt;">Repository: </b>
dragon
</div>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
<table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" \
style="border: 1px solid #b8b5a0"> <tr>
<td>
<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: \
-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;">Fixes an issue where playing audio content keeps the screen awake. Video \
content is supposed to, but with the new play URL button, dragon should allow the \
monitor to turn off.</pre> </td>
</tr>
</table>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
<table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" style="border: \
1px solid #b8b5a0"> <tr>
<td>
<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: \
-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;">Compile, run-test</pre> </td>
</tr>
</table>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
<ul style="margin-left: 3em; padding-left: 0;">
<li>src/app/mainWindow.cpp <span style="color: grey">(f850820)</span></li>
</ul>
<p><a href="https://git.reviewboard.kde.org/r/112076/diff/" style="margin-left: \
3em;">View Diff</a></p>
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