[vlc-commits] vlc-thumb: video thumbnailer for nautilus
Rafaël Carré
git at videolan.org
Mon May 16 00:02:30 CEST 2011
vlc | branch: master | Rafaël Carré <rafael.carre at gmail.com> | Sun May 15 17:57:08 2011 -0400| [82497e9a8d2809eb18dbf6d6251a3ddeaafd29c5] | committer: Rafaël Carré
vlc-thumb: video thumbnailer for nautilus
> http://git.videolan.org/gitweb.cgi/vlc.git/?a=commit;h=82497e9a8d2809eb18dbf6d6251a3ddeaafd29c5
---
doc/libvlc/vlc-thumb.c | 204 ++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 204 insertions(+), 0 deletions(-)
diff --git a/doc/libvlc/vlc-thumb.c b/doc/libvlc/vlc-thumb.c
new file mode 100644
index 0000000..a4d870f
--- /dev/null
+++ b/doc/libvlc/vlc-thumb.c
@@ -0,0 +1,204 @@
+/* Copyright Rafaël Carré (licence WTFPL) */
+/* A video thumbnailer compatible with nautilus */
+/* Copyright © 2007-2011 Rafaël Carré <funman at videolanorg> */
+
+/* Works with : libvlc 1.2.0
+ gcc -pedantic -Wall -Werror -Wextra `pkg-config --cflags --libs libvlc`
+
+ # to register the thumbnailer:
+ list=`grep ^Mime vlc.desktop|cut -d= -f2-|sed -e s/";"/\\\n/g -e s,/,@,g`
+ vid=`echo $mimes|grep ^vid`
+ for i in $vid
+ do
+ key=/desktop/gnome/thumbnailers/$i/enable
+ gconftool-2 -t boolean -s $key true
+ gconftool-2 -t string -s $key "vlc-thumb -s %s %u %o"
+ done
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <locale.h>
+
+#include <vlc/vlc.h>
+
+/* position at which the snapshot is taken */
+#define VLC_THUMBNAIL_POSITION (30./100.)
+
+static void usage(const char *name, int ret)
+{
+ fprintf(stderr, "Usage: %s [-s width] <video> <output.png>\n", name);
+ exit(ret);
+}
+
+/* extracts options from command line */
+static void cmdline(int argc, const char **argv, const char **in,
+ char **out, char **out_with_ext, int *w)
+{
+ int idx = 1;
+ size_t len;
+
+ if (argc != 3 && argc != 5)
+ usage(argv[0], argc != 2 || strcmp(argv[1], "-h"));
+
+ *w = 0;
+
+ if (argc == 5) {
+ if (strcmp(argv[1], "-s"))
+ usage(argv[0], 1);
+
+ idx += 2; /* skip "-s width" */
+ *w = atoi(argv[2]);
+ }
+
+ *in = argv[idx++];
+ *out = strdup(argv[idx++]);
+ assert(*out);
+
+ len = strlen(*out);
+ if (len >= 4 && !strcmp(*out + len - 4, ".png")) {
+ *out_with_ext = *out;
+ return;
+ }
+
+ /* We need to add .png extension to filename,
+ * VLC relies on it to detect output format,
+ * and nautilus doesn't give filenames ending in .png */
+
+ *out_with_ext = malloc(len + sizeof ".png");
+ assert(*out_with_ext);
+ strcpy(*out_with_ext, *out);
+ strcat(*out_with_ext, ".png");
+}
+
+static libvlc_instance_t *create_libvlc(void)
+{
+ static const char* const args[] = {
+ "--intf", "dummy", /* no interface */
+ "--vout", "dummy", /* we don't want video (output) */
+ "--no-audio", /* we don't want audio (decoding) */
+ "--no-video-title-show", /* nor the filename displayed */
+ "--no-stats", /* no stats */
+ "--no-sub-autodetect-file", /* we don't want subtitles */
+ "--no-inhibit", /* we don't want interfaces */
+ "--no-disable-screensaver", /* we don't want interfaces */
+ "--no-snapshot-preview", /* no blending in dummy vout */
+#if 1
+ "--verbose=2", /* full log */
+#endif
+ };
+
+ return libvlc_new(sizeof args / sizeof *args, args);
+}
+
+static void callback(const libvlc_event_t *ev, void *param)
+{
+ float new_position = ev->u.media_player_position_changed.new_position;
+
+ switch (ev->type) {
+
+ case libvlc_MediaPlayerPositionChanged:
+ if (new_position >= VLC_THUMBNAIL_POSITION * .9) { /* 90% margin */
+ *(int*)param = 1;
+ }
+ break;
+ case libvlc_MediaPlayerSnapshotTaken:
+ *(int*)param = 1;
+ break;
+
+ default:
+ assert(0);
+ }
+}
+
+/* FIXME: should use pthread notification */
+static void event_wait(const char *error, int *f)
+{
+#define VLC_THUMBNAIL_TIMEOUT 5.0 /* 5 secs */
+#define VLC_THUMBNAIL_LOOP_STEP 0.2 /* 200 ms */
+
+ float max = VLC_THUMBNAIL_TIMEOUT;
+ while ((max -= VLC_THUMBNAIL_LOOP_STEP) > 0.) {
+ if (*f)
+ return;
+
+ usleep(VLC_THUMBNAIL_LOOP_STEP * 1000000);
+ }
+
+ fprintf(stderr,
+ "%s (timeout after %.2f secs!\n", error, VLC_THUMBNAIL_TIMEOUT);
+ exit(1);
+}
+
+static void set_position(libvlc_media_player_t *mp)
+{
+ int f = 0;
+ libvlc_event_manager_t *em = libvlc_media_player_event_manager(mp);
+ assert(em);
+
+ libvlc_event_attach(em, libvlc_MediaPlayerPositionChanged, callback, &f);
+ libvlc_media_player_set_position(mp, VLC_THUMBNAIL_POSITION);
+ event_wait("Couldn't set position", &f);
+ libvlc_event_detach(em, libvlc_MediaPlayerPositionChanged, callback, &f);
+}
+
+static void snapshot(libvlc_media_player_t *mp, int width, char *out_with_ext)
+{
+ int f = 0;
+ libvlc_event_manager_t *em = libvlc_media_player_event_manager(mp);
+ assert(em);
+
+ libvlc_event_attach(em, libvlc_MediaPlayerSnapshotTaken, callback, &f);
+ libvlc_video_take_snapshot(mp, 0, out_with_ext, width, 0);
+ event_wait("Snapshot has not been written", &f);
+ libvlc_event_detach(em, libvlc_MediaPlayerSnapshotTaken, callback, &f);
+}
+
+int main(int argc, const char **argv)
+{
+ const char *in;
+ char *out, *out_with_ext;
+ int width;
+ libvlc_instance_t *libvlc;
+ libvlc_media_player_t *mp;
+ libvlc_media_t *m;
+
+ /* mandatory to support UTF-8 filenames (provided the locale is well set)*/
+ setlocale(LC_ALL, getenv("LANG"));
+
+ cmdline(argc, argv, &in, &out, &out_with_ext, &width);
+
+ /* starts vlc */
+ libvlc = create_libvlc();
+ assert(libvlc);
+
+ m = libvlc_media_new_path(libvlc, in);
+ assert(m);
+
+ mp = libvlc_media_player_new_from_media(m);
+ assert(mp);
+
+ libvlc_media_player_play(mp);
+
+ /* takes snapshot */
+ set_position(mp);
+ snapshot(mp, width, out_with_ext);
+
+ libvlc_media_player_stop(mp);
+
+ /* clean up */
+ if (out != out_with_ext) {
+ rename(out_with_ext, out);
+ free(out_with_ext);
+ }
+ free(out);
+
+ libvlc_media_player_release(mp);
+ libvlc_media_release(m);
+ libvlc_release(libvlc);
+
+ return 0;
+}
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