Messages

1

Graphics / [solved] FFMPEG problem

« on: July 17, 2009, 08:53:26 pm »

Problem solved, sorry for the inconvenience, I hope it'll help others who have the same problem.

Solution :
* Forget about the warning.
* Go to the locations of the errors :
- Replace "codec.codec_type" by "codec->codec_type". Codec is a pointer.
- Replace "pCodecCtx=&pFormatCtx->..." by "pCodecCtx=pFormatCtx->..."
* Use function prototypes in the top of your code.
* Add this function :

Code: [Select]

int img_convert(AVPicture* dst, PixelFormat dst_pix_fmt, AVPicture* src, PixelFormat pix_fmt, int width, int height)
{
   int av_log = av_log_get_level();
   av_log_set_level(AV_LOG_QUIET);
   SwsContext *img_convert_ctx = sws_getContext(width, height, pix_fmt, width, height, dst_pix_fmt, SWS_BICUBIC, NULL, NULL, NULL);
   int result = sws_scale(img_convert_ctx, src->data, src->linesize, 0, height, dst->data, dst->linesize);
   sws_freeContext(img_convert_ctx);
   av_log_set_level(av_log);
   return result;
}


2

Graphics / [solved] FFMPEG problem

« on: July 17, 2009, 08:38:17 pm »

Hello.

I'm trying to play a video file with the Graphics component of SFML, so I used this French tutorial : http://www.sfml-dev.org/wiki/fr/tutoriels/integrervideo.

Here is my code (directly copied from the tutorial) :

Code: [Select]

#include <SFML/Graphics.hpp>
extern "C"
{
  #include <libavformat/avformat.h>
  #include <libavcodec/avcodec.h>
}

sf::RenderWindow App;
sf::Image im_video;
sf::Sprite sp_video;
sf::Uint8 *Data;

AVFormatContext *pFormatCtx;
int             videoStream;
int             iFrameSize;
AVCodecContext  *pCodecCtx;
AVFrame         *pFrame;
AVFrame         *pFrameRGB;
uint8_t         *buffer;
AVPacket        packet;

int init_video(char* filename);
void display();
void close_video();


int init_video(char* filename)
{

AVCodec   *pCodec;

av_register_all();
 
  if(av_open_input_file(&pFormatCtx, filename, NULL, 0, NULL)!=0)
  {
    fprintf(stderr, "Unexisting file!\n");
    return -1;
  }
 
  if(av_find_stream_info(pFormatCtx)<0)
  {
    fprintf(stderr, "Couldn't find stream information!\n");
    return -1;
  }
 
  dump_format(pFormatCtx, 0, filename, 0);

  videoStream=-1;
  for(int i=0; i<(pFormatCtx->nb_streams); i++)
  {
    if(pFormatCtx->streams[i]->codec.codec_type==CODEC_TYPE_VIDEO)
    {
      videoStream=i;
      break;
    }
  }
  if(videoStream==-1)
    return -1;
 
  pCodecCtx=&pFormatCtx->streams[videoStream]->codec;

  pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
  if(pCodec==NULL)
  {
    fprintf(stderr, "Unsupported codec!\n");
    return -1;
  }
 
  if(avcodec_open(pCodecCtx, pCodec)<0)
    return -1;
  iFrameSize = pCodecCtx->width * pCodecCtx->height * 3;

  pFrame=avcodec_alloc_frame();
 
  pFrameRGB=avcodec_alloc_frame();
  if(pFrameRGB==NULL)
    return -1;

  int numBytes=avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width, pCodecCtx->height);
  buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
 
  avpicture_fill((AVPicture *)pFrameRGB, buffer, PIX_FMT_RGB24,
                pCodecCtx->width, pCodecCtx->height);

  Data = new sf::Uint8[pCodecCtx->width * pCodecCtx->height * 4];
 
  return 0;
}

void display()
{
  int frameFinished;
 
  if (av_read_packet(pFormatCtx, &packet) < 0)
  {
    close_video();
    //exit(0);
  }
 
  if(packet.stream_index==videoStream)
  {
avcodec_decode_video(pCodecCtx, pFrame, &frameFinished,
                        packet.data, packet.size);
 
    if(frameFinished)
    {
      // Convert the image from its native format to RGB
      img_convert((AVPicture *)pFrameRGB, PIX_FMT_RGB24,
                  (AVPicture*)pFrame, pCodecCtx->pix_fmt, pCodecCtx->width,
                  pCodecCtx->height);
 }

int j = 0;
    for(int i = 0 ; i < (iFrameSize) ; i+=3)
    {
      Data[j] = pFrameRGB->data[0][i];
      Data[j+1] = pFrameRGB->data[0][i+1];
      Data[j+2] = pFrameRGB->data[0][i+2];
      Data[j+3] = 255;
      j+=4;
    }
    im_video.LoadFromPixels(pCodecCtx->width, pCodecCtx->height, Data);

}
  // Dessiner l'image sur le tampon de l'écran
  App.Draw(sp_video);
}

void close_video()
{
  // Libérer le packet alloué par av_read_frame
  av_free_packet(&packet);
  // Libérer l'image RGB
  av_free(buffer);
  av_free(pFrameRGB);
  // Libérer l'image YUV
  av_free(pFrame);
  // Fermer le codec
  avcodec_close(pCodecCtx);
  // Fermer le  fichier video
  av_close_input_file(pFormatCtx);
}

int main()
{
// Notre fonction pour initialiser la video
if ( init_video("test.avi") == 0 )
{
 // Code SFML de base
 App.Create( sf::VideoMode(pCodecCtx->width*2, pCodecCtx->height*2, 32),
                             "Video avec SFML et FFMpeg"
                           );
 
// On crée notre image, en blanc par exemple
 im_video.Create(pCodecCtx->width, pCodecCtx->height, sf::Color(255,255,255,255));
// J'aime bien ne pas mettre le smooth, ça dépend de la qualité de la video :)
 im_video.SetSmooth(false);
// On crée notre sprite
 sp_video.SetImage(im_video);
// Vous pouvez utiliser les fonctionnalité du sprite sur la video,
// comme le scale, de la même manière qu'une simple image fixe
 
 // La boucle principale
 bool Running = true;
 while (Running)
 {
   // Les évènements
   sf::Event Event;
   while (App.GetEvent(Event))
   {
     if (Event.Type == sf::Event::Closed)
       Running = false;
 
     if ((Event.Type == sf::Event::KeyPressed) && (Event.Key.Code == sf::Key::Escape))
       Running = false;
   }
 
// Notre fonction de lecture et dessin de la video
   display();
 
// On affiche tout ça
   App.Display();
   App.SetFramerateLimit(50);
 }
 
// Notre fonction pour fermer la video
 close_video();
 return EXIT_SUCCESS;
}
  return EXIT_FAILURE;
}


I've also correctly added the following libraries : avformat.lib and avcodec.lib. When I'm trying to build, I get this error :

Code: [Select]

1>------ Build started: Project: ffmpeg_test1, Configuration: Release Win32 ------
1>Compiling...
1>main.cpp
1>.\main.cpp(49) : warning C4018: '<' : signed/unsigned mismatch
1>.\main.cpp(51) : error C2228: left of '.codec_type' must have class/struct/union
1>        type is 'AVCodecContext *'
1>        did you intend to use '->' instead?
1>.\main.cpp(60) : error C2440: '=' : cannot convert from 'AVCodecContext **' to 'AVCodecContext *'
1>        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
1>.\main.cpp(108) : error C3861: 'img_convert': identifier not found
1>Build log was saved at "file://c:\Projects\vcpp\ffmpeg_test1\ffmpeg_test1\Release\BuildLog.htm"
1>ffmpeg_test1 - 3 error(s), 1 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========


Can anyone please help me there ?

3

Graphics / Avoiding the sf::String bug with an array

« on: July 17, 2009, 07:38:40 pm »

I've solved my particular problem of text not drawing itself. It was a pretty stupid error in fact, my "default.ttf" file wasn't located in the "res/img" folder, but in "res/ttf" one...

Well, thanks a lot for your time, and talking about SFML 2.0, I'll wait for the official release builds. I've a very bad experience with building my sources alone (endless days and nights trying to solve never ending building errors, and never once I got a thing correctly compiled...) So thank you very much for your hint, but I think I'll just be patient ! ^^

4

Graphics / Avoiding the sf::String bug with an array

« on: July 17, 2009, 12:50:08 pm »

No, I use the 1.5, since no other releases are available.

I gave the whole code because I don't know where my problem comes from. The text objects don't throw any errors, but they're not visible on my window App...

5

Graphics / Avoiding the sf::String bug with an array

« on: July 16, 2009, 07:30:42 pm »

Thanks a lot for your answers, but my problem remains.
When I use the code you gave, dunce, everything compiles neatly whithout any error or warning, but when I launch the application, the texts don't show up.

I'll give you my C++ codes (some comments are in french, sorry about that). Here is my main.cpp :

Code: [Select]

//main.cpp


// Les Includes de SFML
#include <iostream>

// L'Include de Snake
#include "Game.h"


// La fonction principale du programe
INT WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR strCmdLine, INT )
//int main(int argc, char **argv)
//int main()
{
Game SnSt2Game;

SnSt2Game.init();

SnSt2Game.loop();

std::cout << "Loop ended !" << std::cout;

    return EXIT_SUCCESS;
}



Code: [Select]

//Game.h

// Defines
#define MAX_GAMEMODES 50

// Protection contre les inclusions multiples
#ifndef GAME_H
#define GAME_H

#include <iostream>
#include <fstream>
#include <SFML/Graphics.hpp>
#include "GameMode.h"



class Game
{

public:

// Méthodes
Game();
~Game();
void init();
void loop();

protected:

// Attributs
sf::RenderWindow window;
GameMode *gamemode[TOTALWORKINGMODES];
int active_gamemode;
};





#endif


Code: [Select]

//Game.cpp


#include "Game.h"





Game::Game() : window(sf::VideoMode::GetDesktopMode(), "SnakeSteaks 2", sf::Style::Fullscreen)
{
}


void Game::init()
{
for(int i = 0 ; i < TOTALWORKINGMODES ; i++)
{
gamemode[i] = new GameMode(window, i);
gamemode[i]->init();
}

active_gamemode = 0;
}


void Game::loop()
{
while(active_gamemode != EXITMODE)
{
std::cout << "Looping..." << std::endl;

window.Clear(sf::Color(255,255,255));

// Handle events
int new_mode = gamemode[active_gamemode]->handle_events();

if(new_mode != DEFAULTMODE && active_gamemode != EXITMODE)
{
active_gamemode = new_mode;
}

gamemode[active_gamemode]->update();

gamemode[active_gamemode]->refresh();

if(!(window.IsOpened()))active_gamemode = EXITMODE;

std::cout << "Game Mode : " << active_gamemode << std::endl;

window.Display();
}


}


Game::~Game()
{
for(int i = 0 ; i < TOTALWORKINGMODES ; i++)
{
delete gamemode[i];
}
}




Code: [Select]

//GameMode.h

// Defines
#define MAXSAMEOBJECTS 100
#define TOTALWORKINGMODES 1

#define EXITMODE -2
#define DEFAULTMODE -1
#define MENUMODE 0

#define WINDOW_X float(window.GetWidth())
#define WINDOW_Y float(window.GetHeight())
#define PERCENT_X  * float(window.GetWidth()) / 100.f
#define PERCENT_Y  * float(window.GetHeight()) / 100.f

// Protection contre les inclusions multiples
#ifndef GAMEMODE_H
#define GAMEMODE_H

#include <SFML/Graphics.hpp>
#include <iostream>
//#include "MyString.h"


class GameMode
{

public:

// Méthodes
GameMode(sf::RenderWindow &refwindow, int new_id);
void init();
int handle_events();
void handle_event(sf::Event &events);
void update();
void refresh();
~GameMode();

protected:

// Attributs
int mode_id;
int game_mode;
std::string name;
sf::Image img_fond;
sf::Sprite fond;
sf::Image image[MAXSAMEOBJECTS];
sf::Sprite sprite[MAXSAMEOBJECTS];
sf::String *texte[MAXSAMEOBJECTS];
sf::Font fonte[MAXSAMEOBJECTS];
sf::RenderWindow &window;

};





#endif


Code: [Select]

//GameMode.cpp


#include "GameMode.h"



GameMode::GameMode(sf::RenderWindow &refwindow, int new_id) : window(refwindow)
{
fonte[0].LoadFromFile("res/img/default.ttf");

for(int i = 0; i < MAXSAMEOBJECTS ; i++)
{
texte[i] = new sf::String("", fonte[0]);
}

switch(new_id)
{
case MENUMODE:
name = "Menu";
break;

default:
std::cout << "Error : Undefined mode " << new_id << std::endl;
name = "Error";
break;
}

mode_id = new_id;
}



void GameMode::init()
{

switch(mode_id)
{
case MENUMODE:
std::cout << "Initialising Menu" << std::endl;
// Loading resources
if (!img_fond.LoadFromFile("res/img/fond.jpg"))
{
std::cout << "Problem loading image." << std::endl;
}
else
{
std::cout << "Loading successful !" << std::endl;
}

// Using resources
fond.SetImage(img_fond);
fond.Resize(WINDOW_X, WINDOW_Y);
//fond.SetPosition(0.f, 0.f);

window.Draw(fond);

texte[0]->SetText("Solo");
texte[0]->SetSize(20);
texte[0]->SetColor(sf::Color::Black);
texte[0]->SetPosition((5 PERCENT_X),(10 PERCENT_Y));

texte[1]->SetText("Multi");
texte[1]->SetSize(20);
texte[1]->SetColor(sf::Color::Black);
texte[1]->SetPosition((5 PERCENT_X),(50 PERCENT_Y));
break;

default:
break;
}
}


int GameMode::handle_events()
{
game_mode = DEFAULTMODE;

sf::Event events;
    while (window.GetEvent(events) && game_mode != EXITMODE)
{
        if (events.Type == sf::Event::Closed)
game_mode = EXITMODE;

handle_event(events);
}

if(game_mode == EXITMODE)window.Close();
if(!(window.IsOpened()))game_mode = EXITMODE;

return game_mode;
}


void GameMode::handle_event(sf::Event &events)
{

switch(mode_id)
{
case MENUMODE:
if (events.Type == sf::Event::KeyPressed)
{
// Esc or Q : Quitter
if (events.Key.Code == sf::Key::Escape || events.Key.Code == sf::Key::Q)
game_mode = EXITMODE;
}
break;

default:
break;

}
}


void GameMode::update()
{

switch(mode_id)
{
case MENUMODE:
std::cout << "Nothing to update" << std::endl;
break;

default:
break;
}
}


void GameMode::refresh()
{

switch(mode_id)
{
case MENUMODE:
std::cout << "Drawing menu background..." << std::endl;

window.Draw(fond);

for(int i = 0 ; i < 2 ; i++)
{
window.Draw(*texte[i]);
}

window.Draw(*texte[0]);

break;

default:
break;
}
}



GameMode::~GameMode()
{
for(int i = 0 ; i < MAXSAMEOBJECTS ; i++)
{
delete texte[i];
}
}




Thanks a lot if you can help me !

6

Graphics / Avoiding the sf::String bug with an array

« on: July 15, 2009, 08:48:18 pm »

Hullo.

I'm using the sf::String class, and I get the known Access Violation bug.
I know it comes from the default font destructor, so I'm searching a solution to avoid this problem.

The only thing that's making trouble is that I use an array :

Code: [Select]

sf::String text[100];

The constructor of my GameClass didn't seem to like for loops, so I decided to use pointers and allocation :

Code: [Select]

// This is the pointer array
sf::String* text[100];


// Later I allocate them :
sf::Font MyDefaultFont;
MyDefaultFont.LoadFromFile("default.ttf");
for(int i = 0; i < 100 ; i++)
{
text[i] = new sf::String("", MyDefaultFont);
}


// Everyting's fine this far, I do not forget to delete in the destructor of my GameClass :
for(int i = 0; i < 100 ; i++)
{
delete text[i];
}



The problem I have, and I'm sure it's a stupid one, is with the Draw function...

When I try window.Draw(text[0]), it says that I should use a reference and not a pointer, and when I try window.Draw(*text[0]), everything works fine... except the text is not drawn at all !

(I tried many other ways, creating my own derivated MyString class, but I can't use a custom font because there is no such constructor like font("myverycoolfont.ttf") - which would be very cool by the way, so I tried to create a MyFont class, but still the font wont be loaded from a file within the constructor, etc., etc...)

7

Feature requests / Cross-platform Video solution

« on: July 15, 2009, 07:42:08 pm »

Ok, thank you very much ! I'm going to check out ffmpeg.

8

Feature requests / Cross-platform Video solution

« on: July 14, 2009, 08:34:46 pm »

Hullo !

My name is Jan Keromnes, and I'm the project manager of 7D², a french video game creation team. We're using the SFML library in some of our projects, and we find it really cool because it's cross-platform, incredibly simple, efficient, and, in short, SFML rocks !

The only thing that is really missing in SFML is a solution for videos. Programming video games without being able to play videos is a little frustrating, and I don't like the idea of using a new not-cross-platform library just to play a few videos...

I know it sounds like a terrible lot of work and trouble, but I think that SFML (which is a media library by the way) could so much more with a cross-platform video module, and I know I'm far from being the only one thinking that.

Thank you very much for what you do and for reading this !
Hoping that one day, SFML will be able to handle videos,

Jan.