VLC播放摄像头或者网络摄像头通过rtsp流读取视频

#include <stdio.h>  
#include <stdint.h>  
#include <math.h>  
#include <stdlib.h>  
#include <assert.h>  


#define SDL_MAIN_HANDLED
#include "SDL.h"
#include "SDL_mutex.h"
#include <vlc/vlc.h>  


#pragma comment(lib,"libvlc.lib")
#pragma comment(lib,"libvlccore.lib")
#pragma comment(lib,"SDL2.lib")
#pragma comment(lib,"SDL2main.lib")
#pragma comment(lib,"SDL2test.lib")






#define VIDEOWIDTH 1920  
#define VIDEOHEIGHT 1080  


struct context {
SDL_Renderer *renderer;
SDL_Texture *texture;
SDL_mutex *mutex;
int n;


SDL_Rect displayrect;
int window_w;
int window_h;
};




//const char* rtspAddress = "rtsp://admin:[email protected]";
const char* rtspAddress = "dshow://";


// VLC prepares to render a video frame.  
static void *lock(void *data, void **p_pixels) {


struct context *c = (struct context *) data;


int pitch;
SDL_LockMutex(c->mutex);
SDL_LockTexture(c->texture, NULL, p_pixels, &pitch);


return NULL; // Picture identifier, not needed here.  
}


// VLC just rendered a video frame.  
static void unlock(void *data, void *id, void * const *p_pixels) {


struct context *c = (struct context *) data;
/*


uint16_t *pixels = (uint16_t *) *p_pixels;


// We can also render stuff.
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 {
// RV16 = 5+6+5 pixels per color, BGR.
pixels[y * VIDEOWIDTH + x] = 0x02ff;
}
}
}
*/


SDL_UnlockTexture(c->texture);
SDL_UnlockMutex(c->mutex);
}








// VLC wants to display a video frame.  
static void display(void *data, void *id) {


struct context *ctx = (struct context *) data;
ctx->displayrect.x = 0;
ctx->displayrect.y = 0;
ctx->displayrect.w = ctx->window_w;
ctx->displayrect.h = ctx->window_h;


//    SDL_SetRenderDrawColor(c->renderer, 0, 80, 0, 255);  
SDL_RenderClear(ctx->renderer);
SDL_RenderCopy(ctx->renderer, ctx->texture, NULL, &ctx->displayrect);
SDL_RenderPresent(ctx->renderer);
}


static void quit(int c) {
SDL_Quit();
exit(c);
}


int main(int argc, char *argv[]) {


struct context ctx;


libvlc_instance_t *libvlc;
libvlc_media_t *m;
libvlc_media_player_t *mp;
char const *vlc_argv[] = {
"--no-audio", // Don't play audio.
"--no-xlib", // Don't use Xlib.
"--rtsp-frame-buffer-size=1000000",   //RTSP帧缓冲大小，默认大小为100000
 // Apply a video filter.
 //"--video-filter", "sepia",
 //"--sepia-intensity=200"
};
int vlc_argc = sizeof(vlc_argv) / sizeof(*vlc_argv);


SDL_Event event;
int done = 0, action = 0, pause = 0, n = 0;


//    if(argc < 2) {  
//        printf("Usage: %s <filename>\n", argv[0]);  
//        return EXIT_FAILURE;  
//    }  


// Initialise libSDL.  
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
printf("Could not initialize SDL: %s.\n", SDL_GetError());
return EXIT_FAILURE;
}


// Create SDL graphics objects.  
SDL_Window * window = SDL_CreateWindow("Fartplayer", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 1280, 720,
SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE);
ctx.window_w = 1280;
ctx.window_h = 720;


if (!window) {
fprintf(stderr, "Couldn't create window: %s\n", SDL_GetError());
quit(3);
}


int nRenderDrivers = SDL_GetNumRenderDrivers();
int i = 0;
for (; i < nRenderDrivers; i++) {
SDL_RendererInfo info;
SDL_GetRenderDriverInfo(i, &info);    //d3d  
printf("====info name %d: %s =====\n", i, info.name);
printf("====max_texture_height %d  =====\n", i, info.max_texture_height);
printf("====max_texture_width %d  =====\n", i, info.max_texture_width);


}


SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "linear");
SDL_SetHint(SDL_HINT_RENDER_VSYNC, "1");


ctx.renderer = SDL_CreateRenderer(window, 1, 0);
if (!ctx.renderer) {
fprintf(stderr, "Couldn't create renderer: %s\n", SDL_GetError());
quit(4);
}


ctx.texture = SDL_CreateTexture(ctx.renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, VIDEOWIDTH, VIDEOHEIGHT);
if (!ctx.texture) {
fprintf(stderr, "Couldn't create texture: %s\n", SDL_GetError());
quit(5);
}


ctx.mutex = SDL_CreateMutex();


// If you don't have this variable set you must have plugins directory  
// with the executable or libvlc_new() will not work!  
printf("VLC_PLUGIN_PATH=%s\n", getenv("VLC_PLUGIN_PATH"));




// Initialise libVLC.  
libvlc = libvlc_new(vlc_argc, vlc_argv);
if (NULL == libvlc) {
printf("LibVLC initialization failure.\n");
return EXIT_FAILURE;
}


// m = libvlc_media_new_path(libvlc, "./test.mp4");
m = libvlc_media_new_location(libvlc, rtspAddress);


mp = libvlc_media_player_new_from_media(m);
libvlc_media_release(m);


libvlc_video_set_callbacks(mp, lock, unlock, display, &ctx);
// libvlc_video_set_format(mp, "RV32", VIDEOWIDTH, VIDEOHEIGHT, VIDEOWIDTH * 4);
libvlc_video_set_format(mp, "RV24", VIDEOWIDTH, VIDEOHEIGHT, VIDEOWIDTH * 3);
libvlc_media_player_play(mp);


// Main loop.  
while (!done) {


action = 0;


// Keys: enter (fullscreen), space (pause), escape (quit).  
while (SDL_PollEvent(&event)) {


switch (event.type) {
case SDL_WINDOWEVENT:
if (event.window.event == SDL_WINDOWEVENT_RESIZED) {
SDL_RenderSetViewport(ctx.renderer, NULL);
ctx.displayrect.w = ctx.window_w = event.window.data1;
ctx.displayrect.h = ctx.window_h = event.window.data2;
}
break;
case SDL_QUIT:
done = 1;
break;
case SDL_KEYDOWN:
action = event.key.keysym.sym;
break;
}
}


switch (action) {
case SDLK_ESCAPE:
case SDLK_q:
done = 1;
break;
case ' ':
printf("Pause toggle.\n");
pause = !pause;
break;
}
if (!pause) {
ctx.n++;
}


SDL_Delay(100);
}


// Stop stream and clean up libVLC.  
libvlc_media_player_stop(mp);
libvlc_media_player_release(mp);
libvlc_release(libvlc);


// Close window and clean up libSDL.  
SDL_DestroyMutex(ctx.mutex);
SDL_DestroyRenderer(ctx.renderer);


quit(0);


return 0;
}