About libvlc...

[Kimishima]

Hello there,

I'm trying to use libvlc to play video in a program i'm writing in C++. I use version 0.8.6h. I tried to have this sample working : http://wiki.videolan.org/LibVLC_SampleCode_SDL

But it doesn't compile, for the reason that it doesn't find the type libvlc_media_t (and some other things). This sample looks obsolete, as I didn't find any occurrence of libvlc_meedia_t type in the source of vlc.
So I would like to know, if anyone is used with the latest libvlc, what changes I should do to this sample to have it compile ? The current document is still incomplete so it's a bit hard to understand how it works.

Here's gcc log :

gcc vlctest.c `sdl-config --cflags --libs` -I/usr/include -lvlc
vlctest.c: In function 'main':
vlctest.c:69: error: 'libvlc_media_t' undeclared (first use in this function)
vlctest.c:69: error: (Each undeclared identifier is reported only once
vlctest.c:69: error: for each function it appears in.)
vlctest.c:69: error: 'm' undeclared (first use in this function)
vlctest.c:70: error: 'libvlc_media_player_t' undeclared (first use in this function)
vlctest.c:70: error: 'mp' undeclared (first use in this function)
vlctest.c:75: error: 'VLC_TREE' undeclared (first use in this function)
vlctest.c:75: error: expected '}' before string constant
vlctest.c:137: warning: passing argument 2 of 'libvlc_new' from incompatible pointer type

Please note that I added #include <vlc/libvlc.h> who was already missing.

Thanks

[Kimishima]

I find out that it comes from the fact that I don't have the file control/libvlc_internal.h, where is defined libvlc_media_t. I use Debian and got libvlc0-dev and vlc-nox from aptitude. This include isn't provided in these packages. I downloaded the whole tar (corresponding to version 0.8.6h) in order to have the sources, and this file doesn't appear to be there neither...

Does anyone know why ? And how could I got this fixed in the proper way ?

[Jean-Baptiste Kempf]

Are you sure this code is not for 0.9.0 ?

[Kimishima]

Yes you're right, it looks to be... I got the 0.9.0 sources and this files is in it.

Can I find a 0.9.0 version, packaged for Debian ? There's almost nothing on my Linux target (it's kinda embedded), I can't build the whole source. I'd need only libvlc-dev and vlc-nox. Apt-get doesn't find any package for version 0.9.0... I'd need the binaries of vlc, built in the same way that in the package vlc-nox.

[coder_gate]

Are you sure this code is not for 0.9.0 ?

when i use VLC 0.9.0 lib,it error

i:\ProgramFiles\QtCreator4_62\qt\lib/libqtmaind.a(qtmain_win.o): In function `WinMain@16':
C:\qt-greenhouse\Trolltech\Code_less_create_more\Trolltech\Code_less_create_more\Troll\4.6\qt\src\winmain/qtmain_win.cpp:131: undefined reference to `qMain(int, char**)'
collect2: ld returned 1 exit status
mingw32-make[1]: *** [debug\QTMedia.exe] Error 1
mingw32-make: *** [debug] Error 2

Code: Select all

/* libSDL and libVLC sample code * Copyright © 2008 Sam Hocevar <sam@zoy.org> * license: [http://en.wikipedia.org/wiki/WTFPL WTFPL] */ #include <stdio.h> #include <stdint.h> #include <math.h> #include <stdlib.h> #include <SDL/SDL.h> #include <SDL/SDL_mutex.h> #include <vlc/vlc.h> #define WIDTH 640 #define HEIGHT 480 #define VIDEOWIDTH 320 #define VIDEOHEIGHT 240 struct ctx { SDL_Surface *surf; SDL_mutex *mutex; }; static void myCatch (libvlc_exception_t *ex) { if(libvlc_exception_raised(ex)) { fprintf(stderr, "exception: %s\n", libvlc_exception_get_message(ex)); exit(1); } libvlc_exception_clear(ex); } #ifdef VLC09X static void * lock(struct ctx *ctx) { SDL_LockMutex(ctx->mutex); SDL_LockSurface(ctx->surf); return ctx->surf->pixels; } #else static void lock(struct ctx *ctx, void **pp_ret) { SDL_LockMutex(ctx->mutex); SDL_LockSurface(ctx->surf); *pp_ret = ctx->surf->pixels; } #endif static void unlock(struct ctx *ctx) { /* VLC just rendered the video, but we can also render stuff */ uint16_t *pixels = (uint16_t *)ctx->surf->pixels; int x, y; for(y = 10; y < 40; y++) for(x = 10; x < 40; x++) if(x < 13 || y < 13 || x > 36 || y > 36) pixels[y * VIDEOWIDTH + x] = 0xffff; else pixels[y * VIDEOWIDTH + x] = 0x0; SDL_UnlockSurface(ctx->surf); SDL_UnlockMutex(ctx->mutex); } int main(int argc, char *argv[]) { char clock[64], cunlock[64], cdata[64]; char width[32], height[32], pitch[32]; libvlc_exception_t ex; libvlc_instance_t *libvlc; libvlc_media_t *m; libvlc_media_player_t *mp; char const *vlc_argv[] = { "-q", //"-vvvvv", "--plugin-path", VLC_TREE, "/modules", "--ignore-config", /* Don't use VLC's config files */ "--noaudio", "--vout", "vmem", "--vmem-width", width, "--vmem-height", height, "--vmem-pitch", pitch, "--vmem-chroma", "RV16", "--vmem-lock", clock, "--vmem-unlock", cunlock, "--vmem-data", cdata, }; int vlc_argc = sizeof(vlc_argv) / sizeof(*vlc_argv); SDL_Surface *screen, *empty; SDL_Event event; SDL_Rect rect; int done = 0, action = 0, pause = 0, n = 0; struct ctx ctx; /* * Initialise libSDL */ if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTTHREAD) == -1) { printf("cannot initialize SDL\n"); return EXIT_FAILURE; } empty = SDL_CreateRGBSurface(SDL_SWSURFACE, VIDEOWIDTH, VIDEOHEIGHT, 32, 0, 0, 0, 0); ctx.surf = SDL_CreateRGBSurface(SDL_SWSURFACE, VIDEOWIDTH, VIDEOHEIGHT, 16, 0x001f, 0x07e0, 0xf800, 0); ctx.mutex = SDL_CreateMutex(); int options = SDL_ANYFORMAT | SDL_HWSURFACE | SDL_DOUBLEBUF; screen = SDL_SetVideoMode(WIDTH, HEIGHT, 0, options); if(!screen) { printf("cannot set video mode\n"); return EXIT_FAILURE; } /* * Initialise libVLC */ sprintf(clock, "%lld", (long long int)(intptr_t)lock); sprintf(cunlock, "%lld", (long long int)(intptr_t)unlock); sprintf(cdata, "%lld", (long long int)(intptr_t)&ctx); sprintf(width, "%i", VIDEOWIDTH); sprintf(height, "%i", VIDEOHEIGHT); sprintf(pitch, "%i", VIDEOWIDTH * 2); if(argc < 2) { printf("too few arguments (MRL needed)\n"); return EXIT_FAILURE; } libvlc_exception_init(&ex); libvlc = libvlc_new(vlc_argc, vlc_argv, &ex); myCatch(&ex); m = libvlc_media_new(libvlc, argv[1], &ex); myCatch(&ex); mp = libvlc_media_player_new_from_media(m, &ex); myCatch(&ex); libvlc_media_release(m); libvlc_media_player_play(mp, &ex); myCatch(&ex); /* * Main loop */ rect.w = 0; rect.h = 0; while(!done) { action = 0; /* Keys: enter (fullscreen), space (pause), escape (quit) */ while( SDL_PollEvent( &event ) ) { switch(event.type) { case SDL_QUIT: done = 1; break; case SDL_KEYDOWN: action = event.key.keysym.sym; break; } } switch(action) { case SDLK_ESCAPE: done = 1; break; case SDLK_RETURN: options ^= SDL_FULLSCREEN; screen = SDL_SetVideoMode(WIDTH, HEIGHT, 0, options); break; case ' ': pause = !pause; break; } rect.x = (int)((1. + .5 * sin(0.03 * n)) * (WIDTH - VIDEOWIDTH) / 2); rect.y = (int)((1. + .5 * cos(0.03 * n)) * (HEIGHT - VIDEOHEIGHT) / 2); if(!pause) n++; /* Blitting the surface does not prevent it from being locked and * written to by another thread, so we use this additional mutex. */ SDL_LockMutex(ctx.mutex); SDL_BlitSurface(ctx.surf, NULL, screen, &rect); SDL_UnlockMutex(ctx.mutex); SDL_Flip(screen); SDL_Delay(10); SDL_BlitSurface(empty, NULL, screen, &rect); } /* * Stop stream and clean up libVLC */ libvlc_media_player_stop(mp, &ex); myCatch(&ex); libvlc_media_player_release(mp); libvlc_release(libvlc); /* * Close window and clean up libSDL */ SDL_DestroyMutex(ctx.mutex); SDL_FreeSurface(ctx.surf); SDL_FreeSurface(empty); SDL_Quit(); return 0; }

main.cpp: In function 'int SDL_main(int, char**)':
main.cpp:85: error: 'VLC_TREE' was not declared in this scope

[Jean-Baptiste Kempf]

Use VLC 1.1.0