{"id":191,"date":"2017-09-28T13:31:36","date_gmt":"2017-09-28T13:31:36","guid":{"rendered":"http:\/\/www.uvolante.org\/wordpress\/?page_id=191"},"modified":"2020-01-07T15:57:35","modified_gmt":"2020-01-07T15:57:35","slug":"tp","status":"publish","type":"page","link":"https:\/\/www.uvolante.org\/index.php\/cours\/multimedia\/tp\/","title":{"rendered":"TP"},"content":{"rendered":"

Ce TP propose de compl\u00e9ter un programme de tatouage d’images fixes.
\n<\/span><\/p>\n

Il est possible que vous ayiez besoin des versions compil\u00e9es en statique de\u00a0cjpeg<\/code><\/span>(ici<\/a>) et djpeg<\/code> (l\u00e0<\/a>)<\/span>. <\/span><\/p>\n

Le code du TP s’appuie sur la librairie\u00a0<\/span>libit<\/code> qu’il faut donc installer au pr\u00e9alable. <\/span><\/p>\n

Installation de libit<\/code><\/span><\/h3>\n
~$ MULTIMEDIA=\/home\/dir\/multimedia\n~$ mkdir -p $MULTIMEDIA\/runtime\n~$ cd $MULTIMEDIA\nmultimedia$ git clone https:\/\/forge.uvolante.org\/cayre\/libit\nmultimedia$ cd libit && .\/configure --prefix=$MULTIMEDIA\/runtime \nmultimedia\/libit$ make -j 4 && make install<\/pre>\n
Enfin, rajoutez\u00a0\/home\/dir\/multimedia\/runtime\/libit\/bin<\/code><\/span>\u00e0 votre variable d’environnement $PATH<\/code> (dans votre\u00a0~\/.bashrc<\/code><\/span>ou votre ~\/.profile<\/code><\/span>) :
\n<\/span><\/p>\n
PATH=\/home\/dir\/multimedia\/runtime\/bin:$PATH; export $PATH<\/pre>\n
Installation du code du TP<\/span><\/h3>\n
multimedia\/runtime\/libit$ cd $MULTIMEDIA\nmultmedia$ git clone https:\/\/forge.uvolante.org\/cayre\/wmlab\nmultimedia$ cd wmlab\nmultimedia$ make<\/pre>\n
Vous obtenez deux ex\u00e9cutables : l’encodeur (embedder<\/code><\/span>) et le d\u00e9codeur (decoder<\/code><\/span>). Ils prennent leurs param\u00e8tres depuis les fichiers\u00a0$MULTIMEDIA\/wmlab\/cfg\/*.cfg<\/code>, mais ces derniers peuvent aussi \u00eatre fix\u00e9s en ligne de commande.
\n<\/span><\/p>\n
Note<\/em> : Il est normal<\/em> que l’encodeur produise une faute de segmentation au d\u00e9but : il manque votre code pour le faire fonctionner. <\/span><\/p>\n
\u00c9nonc\u00e9<\/span><\/h3>\n
C’est par ici<\/a>.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"
Ce TP propose de compl\u00e9ter un programme de tatouage d’images fixes. Il est possible que vous ayiez besoin des versions compil\u00e9es en statique de\u00a0cjpeg(ici) et djpeg (l\u00e0). Le code du TP s’appuie sur la librairie\u00a0libit qu’il faut donc installer au…<\/span><\/p>\n
Read more TP<\/span> ›<\/span><\/a><\/div>\n
<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":187,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-191","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.uvolante.org\/index.php\/wp-json\/wp\/v2\/pages\/191"}],"collection":[{"href":"https:\/\/www.uvolante.org\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.uvolante.org\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.uvolante.org\/index.php\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.uvolante.org\/index.php\/wp-json\/wp\/v2\/comments?post=191"}],"version-history":[{"count":8,"href":"https:\/\/www.uvolante.org\/index.php\/wp-json\/wp\/v2\/pages\/191\/revisions"}],"predecessor-version":[{"id":406,"href":"https:\/\/www.uvolante.org\/index.php\/wp-json\/wp\/v2\/pages\/191\/revisions\/406"}],"up":[{"embeddable":true,"href":"https:\/\/www.uvolante.org\/index.php\/wp-json\/wp\/v2\/pages\/187"}],"wp:attachment":[{"href":"https:\/\/www.uvolante.org\/index.php\/wp-json\/wp\/v2\/media?parent=191"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}