sdl

In my project I am having trouble getting a simple switch statement to work for SDL input. Here is the example: SDL_Event event; SDL_PollEvent(&event); if (event.type == SDL_KEYDOWN) { switch (event.key.keysym.sym) { case SDLK_a: m_x -= 30; break; case SDLK_d: m_x += 30; break; case SDLK_w: m_y -= 30; break; case SDLK_s: m_y += 30; break; } } When I run this, first off it seems SDL_KEYDOWN isn't being recognized. Nor are my cases. So I switched the code to: SDL_Event event; SDL_PollEvent(&event); if (event.type == 771) { switch (event.key.keysym.sym) { case SDLK_a: m_x -= 30; break; case SDLK

I'm following the updated version of the original dranger.com/ffmpeg tutorial at https://github.com/mpenkov/ffmpeg-tutorial The third step(Source code: https://github.com/mpenkov/ffmpeg-tutorial/blob/master/tutorial03.c ) adds sound, but the sound produced is strange. When the audio stream is AAC I only hear static. When the audio stream is MP3 I hear a very high pitched version of the sound. What's wrong? I've had the same exact issue. After days of trying, I figured out it was something wrong with the latest build that I was using from Zeranoe. If you are using Zeranoe builds as well, try

Possible Duplicate: How to suppress console output in Python? Currently I am using pygame to read joystick input and I have the following issue that I need to solve. When calling functions in the joystick module such as get_axis() or get_button() the function prints out lines such as SDL_JoystickGetButton value:0: I need to disable the output of these lines to the console. I have found the following question/answer on stackoverflow which is what I'm looking for... How to suppress console output in Python? But this post does not supply enough information. Because if I have to turn off DEBUG, I

SDL介绍 SDL（Simple DirectMedia Layer）是一套开放源代码的跨平台多媒体开发库，使用C语言写成。SDL提供了数种控制图像、声音、输出入的函数，让开发者只要用相同或是相似的代码就可以开发出跨多个平台（Linux、Windows、Mac OS X等）的应用软件。目前 SDL 多用于开发游戏、模拟器、媒体播放器等多媒体应用领域。 SDL（第一版）使用 GNU 宽通用公共许可证为授权方式，意指动态链接（dynamic link）其库并不需要开放本身的源代码。因此诸如《雷神之锤4》等商业游戏也使用SDL来开发。而第二版的SDL则改用Zlib授权来授权。 虽然 SDL 时常被比较为‘跨平台的 DirectX ’，然而事实上 SDL 是定位成以精简的方式来完成基础的功能，它大幅度简化了控制图像、声音、输出入等工作所需撰写的代码。但更高级的绘图功能或是音效功能则需搭配 OpenGL 和 OpenAL 等 API 来达成。另外它本身也没有方便创建图形用户界面的函数。 SDL 在结构上是将不同操作系统的库再包装成相同的函数，例如 SDL 在 Windows 平台上其实是 DirectX 的再包装，旧版本包装的是 DirectX 5，SDL 1.2 则是 DirectX 7 。而在使用 X11 的平台上（包括 Linux ），SDL 则是与 Xlib 库沟通来输出图像。 虽然

I'm learning SDL and I've noticed that I have memory leak when I have this line in my code: m_TextureMap["napis"]= SDL_CreateTextureFromSurface( getRenderer(), textSurface ); I have SDL_FreeSurface(textSurface); right after the first one. When I comment out only this line, there's no memory leak. What am I doing wrong? Is there anything else I need to clean except for SDL_FreeSurface(textSurface) ? P.S. getRenderer is function that returns global SDL renderer, I use this function a lot in other places and I'm sure it doesn't cause leak. m_TextureMap is just a map where I store textures

接下来是解析影片的帧 /*** project.c ***/ #include<stdio.h> #include<libavcodec/avcodec.h> #include<libavformat/avformat.h> #include<libswscale/swscale.h> void SaveFrame(AVFrame *pFrame, int width, int height, int iFrame) { FILE *pFile; char szFilename[32]; int y; //open file sprintf(szFilename,"frame%d.ppm",iFrame); pFile = fopen(szFilename, "wb"); if (NULL == pFile) return; //write header fprintf(pFile, "P6\n%d %d\n255\n",width,height); //write pixel data for (y = 0; y < height; y++) { fwrite(pFrame->data[0] + y * pFrame->linesize[0], 1, width * 3, pFile); } //close file fclose(pFile); } int main(int