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Prototype: demo works — after fixing obvious mistakes

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No fundamental problem discovered thus far...
 - GTK-3 does not resize the window, need to `set_size_request()` (instead of `resize()`)
 - forgot to set slot-state to READ ⟹ submissions flood the full queue
 - condition to allow frame display was too tight, thus slipping at first frame
 - forgot to submit follow-up read tasks
This commit is contained in:
Fischlurch 2026-07-15 23:33:13 +02:00
parent c9f9fec117
commit 0cda45278c
4 changed files with 161 additions and 10 deletions
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3
FrOSCon26/.gitignore vendored
View file

@ -4,4 +4,5 @@
.settings
build
.~lock*
*.log
*.log
*.raw

155
FrOSCon26/FrOSCon.26.mm
View file

@ -2418,8 +2418,7 @@
im State SHOW pasiert jetzt gar nicht mehr das Display, sondern es bedeutet nun, daß der Frame weitergegeben werden muß
</p>
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<linktarget COLOR="#a03127" DESTINATION="ID_194548529" ENDARROW="Default" ENDINCLINATION="373;0;" ID="Arrow_ID_726120332" SOURCE="ID_312946304" STARTARROW="None" STARTINCLINATION="-39;152;"/>
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<node CREATED="1784221423989" ID="ID_1367029376" MODIFIED="1784221595584" TEXT="nenne diese Phase jetzt FEED">
@ -2433,9 +2432,157 @@
</html></richcontent>
</node>
</node>
<node CREATED="1784229335474" ID="ID_476891533" MODIFIED="1784229337398" TEXT="Fragen">
<node BACKGROUND_COLOR="#f0d5c5" COLOR="#990033" CREATED="1784229339746" ID="ID_655619575" MODIFIED="1784229414327" TEXT="bisher habe ich in addNext... die mem_order_seq_cst">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
...weil das der Default ist, ich hab deshalb n&#228;mlich gar keine angegeben
</p>
</body>
</html></richcontent>
<font NAME="SansSerif" SIZE="12"/>
<icon BUILTIN="help"/>
<node CREATED="1784229415567" ID="ID_572644187" MODIFIED="1784229431525" TEXT="g&#xe4;be es einen Unterschied zu mem_order_acquire?"/>
<node CREATED="1784229436588" ID="ID_1851133925" MODIFIED="1784229459165" TEXT="oder wird beim Lesen keine Write-Barrier erzeugt?"/>
</node>
</node>
</node>
<node COLOR="#338800" CREATED="1784222841942" ID="ID_74519525" MODIFIED="1784239417461" TEXT="zum Laufen bringen">
<icon BUILTIN="button_ok"/>
<node CREATED="1784223517618" ID="ID_609106899" MODIFIED="1784223526502" TEXT="startet schon mal bis zum &#xd6;ffnen des File"/>
<node CREATED="1784223529015" ID="ID_1980887771" MODIFIED="1784223533004" TEXT="brauche nun ein Testvideo">
<node CREATED="1784223536006" ID="ID_44452226" MODIFIED="1784223551564" TEXT="Test-1: nehme die Animation von letztem Jahr">
<node BACKGROUND_COLOR="#accdc3" COLOR="#010101" CREATED="1784226368203" ID="ID_1901417329" MODIFIED="1784226455132" STYLE="fork" TEXT="lasse mir von Claude ein Aufruf-Programm erzeugen">
<edge COLOR="#808080" STYLE="bezier" WIDTH="thin"/>
<icon BUILTIN="idea"/>
<node CREATED="1784226456781" ID="ID_401970861" MODIFIED="1784226467897" TEXT="hinzugef&#xfc;gt zum letztj&#xe4;hrigen Froscon-Projekt"/>
<node CREATED="1784226468341" ID="ID_399827309" MODIFIED="1784226488382" TEXT="als neuer Unterordner examples/raw"/>
<node CREATED="1784226522365" ID="ID_303378535" MODIFIED="1784226528208" TEXT="verwendet image-gen"/>
<node CREATED="1784226528773" ID="ID_1747867217" MODIFIED="1784226537423" TEXT="schreibt ein Raw-Video ins aktuelle Verzeichnis"/>
</node>
<node CREATED="1784226886199" ID="ID_1477642542" MODIFIED="1784227084689" TEXT="anzeigen....">
<icon BUILTIN="back"/>
<node CREATED="1784226890979" ID="ID_634134790" MODIFIED="1784226920034" TEXT="ffplay">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
ffplay -f rawvideo -pixel_format rgb24 -video_size 320x240 -framerate 30 demovideo-320.raw
</p>
</body>
</html></richcontent>
<icon BUILTIN="wizard"/>
</node>
<node CREATED="1784226921919" ID="ID_454447584" MODIFIED="1784226963886" TEXT="vlc">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
vlc --demux rawvideo --rawvid-width 320 --rawvid-height 240 --rawvid-chroma RV24 --rawvid-fps 30 demovideo-320.raw
</p>
</body>
</html></richcontent>
<icon BUILTIN="wizard"/>
</node>
</node>
</node>
</node>
<node COLOR="#435e98" CREATED="1784228106784" ID="ID_1212494407" MODIFIED="1784229520498" STYLE="fork" TEXT="Segfault">
<font NAME="SansSerif" SIZE="12"/>
<icon BUILTIN="broken-line"/>
<node CREATED="1784228751285" ID="ID_1565658342" MODIFIED="1784228767139" TEXT="beim ersten initialen Bef&#xfc;llen der SQ"/>
<node CREATED="1784228768814" ID="ID_259879669" MODIFIED="1784228789008" TEXT="der Timer-Entry funktioniert"/>
<node CREATED="1784228840197" ID="ID_870664557" MODIFIED="1784228851823" TEXT="ein SQE kommt als NULL zur&#xfc;ck"/>
<node BACKGROUND_COLOR="#e0ceaa" COLOR="#690f14" CREATED="1784228853179" ID="ID_1537742880" MODIFIED="1784229512039" TEXT="AUA ... nextRead_ steht auf 7">
<icon BUILTIN="messagebox_warning"/>
<node CREATED="1784228886607" ID="ID_630552952" MODIFIED="1784228889758" TEXT="wir wrappen">
<node CREATED="1784228902224" ID="ID_1676148614" MODIFIED="1784228918826" TEXT="(intern fa&#xdf;t die Queue sogar 8 Eintr&#xe4;ge)">
<icon BUILTIN="idea"/>
</node>
<node BACKGROUND_COLOR="#e0ceaa" COLOR="#690f14" CREATED="1784228920986" ID="ID_815377389" MODIFIED="1784239445118" TEXT="der State-Marker wurde nicht weitergeschaltet">
<icon BUILTIN="broken-line"/>
</node>
</node>
</node>
</node>
<node COLOR="#435e98" CREATED="1784235804029" ID="ID_1424148212" MODIFIED="1784235907976" TEXT="Fenster zu klein">
<icon BUILTIN="messagebox_warning"/>
<node CREATED="1784235809692" ID="ID_1855255977" MODIFIED="1784235916712" TEXT="das window.set_size() wird ignoriert">
<icon BUILTIN="help"/>
</node>
<node CREATED="1784235819503" ID="ID_1683175695" LINK="https://stackoverflow.com/a/3582628/444796" MODIFIED="1784235920446" TEXT="Suche im Netz: set_resizable(false) zwingt auf den size-request zur&#xfc;ck">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
das ist zwar nicht logisch, und auch nicht so dokumentiert, wurde aber von anderen Leuten bereits f&#252;r GTK-3 beobachtet
</p>
</body>
</html></richcontent>
<icon BUILTIN="idea"/>
</node>
<node COLOR="#338800" CREATED="1784235892210" ID="ID_1028422738" MODIFIED="1784235902975" TEXT="L&#xf6;sung: set_size_request() direkt im launchPlayer()">
<icon BUILTIN="button_ok"/>
</node>
</node>
<node COLOR="#435e98" CREATED="1784229521721" ID="ID_698829631" MODIFIED="1784238411088" TEXT="Alle Frames Slipped">
<icon BUILTIN="broken-line"/>
<node CREATED="1784238232017" ID="ID_1493418690" MODIFIED="1784238248280" TEXT="Anzeigebedingung greift nicht im Anfangszustand"/>
<node CREATED="1784238248956" ID="ID_1279441149" MODIFIED="1784238267938" TEXT="zu Beginn ist currShow &#x2261; nextShow">
<node CREATED="1784238311811" ID="ID_210721081" MODIFIED="1784238324834" TEXT="Bedingung pr&#xe4;ziser formulieren"/>
<node CREATED="1784238325286" ID="ID_782122885" MODIFIED="1784238407314">
<richcontent TYPE="NODE"><html>
<head/>
<body>
<p>
<font color="#3a1f18" face="DejaVu Sans Mono" size="9pt">prevState </font><font color="#65533c" face="DejaVu Sans Mono" size="9pt">!=</font><font color="#3a1f18" face="DejaVu Sans Mono" size="9pt">&#160;</font><font color="#9d724e" face="DejaVu Sans Mono" size="9pt"><i>SHOW</i></font>
</p>
</body>
</html></richcontent>
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
denn zur Anzeige wird der Slot auf <font color="#9d724e" face="DejaVu Sans Mono"><i>SHOW </i></font>gesetzt; zu pr&#252;fen ist also, da&#223; dieser Zustand sich ge&#228;ndert hat.
</p>
<p>
</p>
</body>
</html></richcontent>
</node>
</node>
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<node COLOR="#435e98" CREATED="1784238412197" ID="ID_377076622" MODIFIED="1784239365101" TEXT="5 Frames angezeigt &#x2014; dann Slipped">
<icon BUILTIN="broken-line"/>
<node CREATED="1784239290031" ID="ID_826828158" MODIFIED="1784239308912" TEXT="im 5. &#x2259; 0.Slot steht READ"/>
<node CREATED="1784239309460" ID="ID_686652707" MODIFIED="1784239363002">
<richcontent TYPE="NODE"><html>
<head/>
<body>
<p>
<font color="#642880" face="DejaVu Sans Mono"><b>io_uring_submit</b></font><font color="#11123a" face="DejaVu Sans Mono">(</font><font color="#65533c" face="DejaVu Sans Mono">&amp;</font><font color="#803435" face="DejaVu Sans Mono">uRing</font><font color="#11123a" face="DejaVu Sans Mono">)</font>&#160;&#160;vergessen
</p>
</body>
</html></richcontent>
<icon BUILTIN="broken-line"/>
</node>
</node>
<node BACKGROUND_COLOR="#174956" COLOR="#8dfd49" CREATED="1784239367168" HGAP="13" ID="ID_790023827" MODIFIED="1784239428069" STYLE="bubble" TEXT="Kaum macht mans richtig &#x2014; schon funktioniert&apos;s" VSHIFT="12">
<edge COLOR="#61fe5b" STYLE="bezier" WIDTH="thin"/>
<font NAME="SansSerif" SIZE="14"/>
<node COLOR="#054262" CREATED="1784239826448" ID="ID_273149802" MODIFIED="1784239872263" STYLE="fork" TEXT="auch getested: schnellere Wiedergabe">
<font NAME="SansSerif" SIZE="11"/>
</node>
<node COLOR="#054262" CREATED="1784239826448" ID="ID_776972591" MODIFIED="1784239931511" STYLE="fork" TEXT="getested: Playback-Stop bei end-of-file">
<font NAME="SansSerif" SIZE="11"/>
</node>
<node COLOR="#054262" CREATED="1784239826448" ID="ID_1233113947" MODIFIED="1784239901209" STYLE="fork" TEXT="getested: Fenster verschieben w&#xe4;hrend Widergabe">
<font NAME="SansSerif" SIZE="11"/>
</node>
</node>
<node BACKGROUND_COLOR="#fdfdcf" COLOR="#ff0000" CREATED="1784222841942" ID="ID_74519525" MODIFIED="1784222846614" TEXT="zum Laufen bringen">
<icon BUILTIN="flag-pink"/>
</node>
</node>
</node>

12
FrOSCon26/examples/demo-uring.cpp
View file

@ -170,6 +170,7 @@ UringVideoPlayer::playVideo()
{
maybeDisplayFrame();
addNextReadSubmissions (uRing, inputFD);
io_uring_submit (&uRing);
}
else
handleCompletedRead (*completion);
@ -202,6 +203,7 @@ UringVideoPlayer::addNextReadSubmissions (io_uring& uRing, int inputFD)
,BUFFSIZ * srcOffset
);
io_uring_sqe_set_data64 (readSubmission, nextRead_);
buffState_[nextRead_ % RING_SIZ].store (READ, std::memory_order_relaxed);
++nextRead_;
}
}
@ -236,10 +238,10 @@ UringVideoPlayer::handleCompletedRead (io_uring_cqe& completion)
void
UringVideoPlayer::maybeDisplayFrame()
{
auto prevState = buffState_[currShow_ % RING_SIZ].load (std::memory_order_relaxed);
auto prevState = buffState_[currShow_ % RING_SIZ].load (std::memory_order_acquire);
auto nextState = buffState_[nextShow_ % RING_SIZ].load (std::memory_order_relaxed);
if (nextState == FEED and prevState == FREE)
if (nextState == FEED and prevState != SHOW)
{ // can hand over this next frame to the VideoDisplay in the GUI-thread
currShow_ = nextShow_;
++nextShow_;
@ -307,8 +309,10 @@ UringVideoPlayer::terminate()
unique_ptr<UringVideoPlayer>
launchPlayer (Gtk::Window& appWindow)
{
appWindow.resize (VIDEO_WIDTH, VIDEO_HEIGHT);
{ // force minimum size to fit the player...
appWindow.set_size_request (VIDEO_WIDTH, VIDEO_HEIGHT);
appWindow.set_resizable (false);
return std::make_unique<UringVideoPlayer> (appWindow);
}

1
FrOSCon26/examples/gtk-uring-app.hpp
View file

@ -48,7 +48,6 @@ class GtkUringApp
public:
DemoWindow()
{
// set_default_size (CTX::VIDEO_WIDTH, CTX::VIDEO_HEIGHT);
set_resizable (false);
add (button_);
button_.show();