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Posted: **06 Aug 2008 10:15**

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

Posted: **07 Aug 2008 14:24**

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 ?

Posted: **08 Aug 2008 03:03**

Are you sure this code is not for 0.9.0 ?

Posted: **08 Aug 2008 11:07**

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.

Posted: **26 Apr 2010 11:03**

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

Posted: **26 Apr 2010 13:18**

Use VLC 1.1.0

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