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| − | This sample code will generate a thumbnail from any media.
| + | {{Lowercase}} |
| − | It can be used by nautilus instead of totem-video-thumbnailer
| + | Moved [http://git.videolan.org/?p=vlc.git;a=blob;f=doc/libvlc/vlc-thumb.c]. |
| − | /* Copyright [[User:Funman|Rafaël Carré]] (licence [http://en.wikipedia.org/wiki/WTFPL WTFPL]) */
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| − | <pre>
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| − | /* A video thumbnailer compatible with nautilus */
| |
| − | /* Copyright © 2007-2008 Rafaël Carré <funman@videolanorg> */ | |
| | | | |
| − | #include <stdio.h>
| + | [[Category:libVLC]] |
| − | #include <vlc/libvlc.h>
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| − | #include <stdlib.h>
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| − | #include <string.h>
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| − | #include <unistd.h>
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| − | #include <locale.h>
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| − | #include <sys/types.h>
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| − | #include <sys/stat.h>
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| − | | |
| − | /* gcc -ansi -Wall -Werror -lvlc-control vlc-video-thumbnailer.c */
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| − | | |
| − | #if 1
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| − | # define DEBUG( s ) fprintf( stderr, s"\n" );
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| − | #else
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| − | # define DEBUG( s )
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| − | #endif
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| − | | |
| − | /* position to seek to (out of 1.) */
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| − | #define POS 0.3
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| − | | |
| − | /* delay before aborting ( real delay will be * 2 ) */
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| − | #define MAX_DELAY 5.0
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| − | | |
| − | /* for the callback to notify the main thread that the position changed */
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| − | static int fini = 0;
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| − | | |
| − | /* to catch problems */
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| − | static libvlc_exception_t ex;
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| − | | |
| − | /* "position changed" callback */
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| − | static void callback( const libvlc_event_t *ev, void *param )
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| − | {
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| − | if( ev->type == libvlc_MediaInstancePositionChanged )
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| − | {
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| − | float new_pos;
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| − | new_pos = ev->u.media_instance_position_changed.new_position;
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| − | if( new_pos >= POS - ( POS / 10 ) )
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| − | {
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| − | DEBUG( "Position set" );
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| − | fini = 1; /* now we can take the snapshot */
| |
| − | }
| |
| − | }
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| − | else
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| − | {
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| − | fprintf( stderr, "Error: catched event %s\n",
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| − | libvlc_event_type_name( ev->type ) );
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| − | exit(1);
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| − | }
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| − | }
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| − | | |
| − | static void catch (void)
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| − | {
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| − | if (libvlc_exception_raised (&ex))
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| − | {
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| − | fprintf (stderr, "Exception: %s\n",
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| − | libvlc_exception_get_message (&ex));
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| − | exit(1);
| |
| − | }
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| − | | |
| − | libvlc_exception_clear (&ex);
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| − | }
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| − | | |
| − | /* nautilus doesn't use .png extension, and vlc detects the filetype with the
| |
| − | * extension, so we use a temporary file to be sure we'll use png */
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| − | #define TEMP "/tmp/vlc-video-thumbnailer.png"
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| − | | |
| − | #define usage() \
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| − | fprintf( stderr, \
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| − | "Usage: %s input output\n" \
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| − | "input being any video VLC can read, and output a png file\n" \
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| − | , argv[0] )
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| − | | |
| − | int main( int argc, const char **argv )
| |
| − | {
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| − | if( argc != 3 && argc != 5 )
| |
| − | {
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| − | usage();
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| − | if( argc == 2 && ( !strcmp( argv[1], "-h" ) || strcmp( argv[1], "--help") ) )
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| − | return 0;
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| − | else
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| − | return 1;
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| − | }
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| − | | |
| − | /* mandatory to support UTF-8 filenames (provided the locale is well set)*/
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| − | setlocale( LC_ALL, getenv( "LANG" ) );
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| − | | |
| − | const char const *input, *output;
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| − | int i_width, i_height = 0;
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| − | | |
| − | if( argc == 5 )
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| − | {
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| − | if( strcmp( argv[1], "-s" ) )
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| − | {
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| − | usage();
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| − | return 1;
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| − | }
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| − | i_width = atoi( argv[2] );
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| − | input = argv[3];
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| − | output = argv[4];
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| − | }
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| − | else
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| − | {
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| − | input = argv[1];
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| − | output = argv[2];
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| − | i_width = 0;
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| − | }
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| − | | |
| − | libvlc_exception_init( &ex );
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| − | | |
| − | /* libvlc settings */
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| − | const char* const args[] = {
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| − | "-I", "dummy", /* no interface */
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| − | "--vout", "dummy", /* we don't want video (output) */
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| − | "--no-audio", /* we don't want audio */
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| − | "--verbose=0", /* show only errors */
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| − | "--no-media-library", /* don't want that */
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| − | "--services-discovery", "", /* nor that */
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| − | "--no-video-title-show", /* nor the filename displayed */
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| − | "--no-stats", /* no stats */
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| − | "--config", "/dev/null", /* don't overwrite the config */
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| − | "--no-sub-autodetect", /* don't want subtitles */
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| − | "--control", "", /* don't want interface (again) */
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| − | "--no-inhibit", /* i say no interface ! */
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| − | "--no-disable-screensaver", /* wanna fight ? */
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| − | "--extraintf", "" /* ok, it will be a piece of cake */
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| − | };
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| − | | |
| − | int nargs = sizeof(args) / sizeof(args[0]);
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| − | libvlc_instance_t *libvlc = libvlc_new( nargs, args, &ex );
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| − | catch();
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| − | | |
| − | libvlc_media_instance_t *mi;
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| − | libvlc_media_descriptor_t *md;
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| − | | |
| − | | |
| − | md = libvlc_media_descriptor_new( libvlc, input, &ex );
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| − | catch();
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| − |
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| − | mi = libvlc_media_instance_new_from_media_descriptor( md, &ex );
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| − | catch();
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| − | | |
| − | libvlc_media_descriptor_release( md );
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| − | | |
| − | libvlc_media_instance_play( mi, &ex );
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| − | catch();
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| − | | |
| − | /* avoid introduction */
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| − | libvlc_media_instance_set_position( mi, POS, &ex );
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| − | catch();
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| − | | |
| − | libvlc_event_manager_t *em;
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| − | em = libvlc_media_instance_event_manager( mi, &ex );
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| − | catch();
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| − | | |
| − | libvlc_event_attach( em, libvlc_MediaInstancePositionChanged,
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| − | callback, NULL, &ex );
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| − | catch();
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| − | | |
| − | float max = MAX_DELAY; /* don't wait more MAX_DELAY seconds */
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| − | while( !fini && ( max -= .2 ) > 0 ) /* wait for the position changed event */
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| − | usleep( 200000 );
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| − | | |
| − | libvlc_event_detach( em, libvlc_MediaInstancePositionChanged,
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| − | callback, NULL, &ex );
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| − | catch();
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| − | | |
| − | DEBUG( "Taking snapshot" );
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| − | libvlc_video_take_snapshot( mi, TEMP, i_width, i_height, &ex );
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| − | catch();
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| − | | |
| − | sleep( 1 ); /* be sure that the snapshot has been written */
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| − | | |
| − | DEBUG( "Stopping" );
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| − | libvlc_media_instance_stop( mi, &ex );
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| − | catch();
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| − | | |
| − | max = MAX_DELAY;
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| − | while( ( max -= .2 ) > 0 )
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| − | {
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| − | struct stat st;
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| − | if( stat( TEMP, &st ) == 0 )
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| − | break;
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| − | DEBUG( TEMP" doesn't exist" );
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| − | if( max <= .2 )
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| − | {
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| − | DEBUG( "Snapshot has not been written :(" );
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| − | goto end;
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| − | }
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| − | usleep( 200000 );
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| − | }
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| − | | |
| − | DEBUG( "Moving snapshot" );
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| − | char *mv;
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| − | if( asprintf( &mv, "mv \"%s\" \"%s\"", TEMP, output ) == -1 )
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| − | return 1;
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| − | system( mv );
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| − | free( mv );
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| − | | |
| − | end:
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| − | libvlc_media_instance_release( mi );
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| − | | |
| − | libvlc_release( libvlc, &ex );
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| − | catch();
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| − | | |
| − | return 0;
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| − | }</pre>
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