在使用imx6qsabre-sdp板卡, 移植运行linux3.10.53内核。对应的开发环境是yocto-3.10.53. 自己手动交叉编译SDL2.0.3库和实例程序，手动编译SDL2.0.3库，配置如下：
./configure --host=arm-poky-linux-gnueabi --x-include=/opt/fsl-release-bsp/build-x11/tmp/sysroots/imx6qsabresd/usr/include/ --x-libraries=/opt/fsl-release-bsp/build-x11/tmp/sysroots/imx6qsabresd/usr/lib --with-x --enable-video-x11 --enable-x11-shared --enable-video-x11-xcursor --enable-video-x11-xinerama --enable-video-x11-xinput --enable-video-x11-xrandr --enable-video-x11-scrnsaver --enable-video-x11-xshape --enable-video-x11-vm --enable-video-dummy --enable-video-opengl --enable-video-opengles --enable-libudev --enable-dbus --enable-input-tslib --enable-pthreads --enable-pthread-sem --disable-assembly --prefix=/opt/sdl-2.0.3-lib
这样配置后，可以正常编译出库文件，并拷贝到目标机文件系统/usr/lib下。
实例程序源码如下：
#include <stdio.h>
//extern "C"
//{
//#include "SDL2/SDL.h"
#include <SDL2/SDL.h>
//};
//set '1' to choose a type of file to play
#define LOAD_BGRA 0
#define LOAD_RGB24 0
#define LOAD_BGR24 0
#define LOAD_YUV420P 1
//Bit per Pixel
#if LOAD_BGRA
const int bpp=32;
#elif LOAD_RGB24|LOAD_BGR24
const int bpp=24;
#elif LOAD_YUV420P
const int bpp=12;
#endif
int screen_w=500,screen_h=500;
const int pixel_w=352,pixel_h=288;
unsigned char buffer[352*288*24/8];
//BPP=32
unsigned char buffer_convert[352*288*4];
//Convert RGB24/BGR24 to RGB32/BGR32
//And change Endian if needed
void CONVERT_24to32(unsigned char *image_in,unsigned char *image_out,int w,int h)
{
int i, j;
for(i =0;i<h;i++)
for(j=0;j<w;j++)
{
//Big Endian or Small Endian?
//"ARGB" order:high bit -> low bit.
//ARGB Format Big Endian (low address save high MSB, here is A) in memory : A|R|G|B
//ARGB Format Little Endian (low address save low MSB, here is B) in memory : B|G|R|A
if(SDL_BYTEORDER==SDL_LIL_ENDIAN){
//Little Endian (x86): R|G|B --> B|G|R|A
image_out[(i*w+j)*4+0]=image_in[(i*w+j)*3+2];
image_out[(i*w+j)*4+1]=image_in[(i*w+j)*3+1];
image_out[(i*w+j)*4+2]=image_in[(i*w+j)*3];
image_out[(i*w+j)*4+3]='0';
}else{
//Big Endian: R|G|B --> A|R|G|B
image_out[(i*w+j)*4]='0';
memcpy(image_out+(i*w+j)*4+1,image_in+(i*w+j)*3,3);
}
}
}
//Refresh Event
#define REFRESH_EVENT (SDL_USEREVENT + 1)
int thread_exit=0;
int refresh_video(void *opaque){
while (thread_exit==0) {
SDL_Event event;
event.type = REFRESH_EVENT;
SDL_PushEvent(&event);
SDL_Delay(40);
}
return 0;
}
int main(int argc, char* argv[])
{
if(SDL_Init(SDL_INIT_VIDEO)) {
printf( "Could not initialize SDL - %s\n", SDL_GetError());
return -1;
}
SDL_Window *screen;
//SDL 2.0 Support for multiple windows
screen = SDL_CreateWindow("Simplest Video Play SDL2", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
screen_w, screen_h,SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE);
if(!screen) {
printf("SDL: could not create window - exiting:%s\n",SDL_GetError());
return -1;
}
SDL_Renderer* sdlRenderer = SDL_CreateRenderer(screen, -1, 0);
Uint32 pixformat=0;
#if LOAD_BGRA
//Note: ARGB8888 in "Little Endian" system stores as B|G|R|A
pixformat= SDL_PIXELFORMAT_ARGB8888;
#elif LOAD_RGB24
pixformat= SDL_PIXELFORMAT_RGB888;
#elif LOAD_BGR24
pixformat= SDL_PIXELFORMAT_BGR888;
#elif LOAD_YUV420P
//IYUV: Y + U + V (3 planes)
//YV12: Y + V + U (3 planes)
pixformat= SDL_PIXELFORMAT_IYUV;
#endif
SDL_Texture* sdlTexture = SDL_CreateTexture(sdlRenderer,pixformat, SDL_TEXTUREACCESS_STREAMING,pixel_w,pixel_h);
FILE *fp=NULL;
#if LOAD_BGRA
fp=fopen("test_bgra_320x180.rgb","rb+");
#elif LOAD_RGB24
fp=fopen("../test_rgb24_320x180.rgb","rb+");
#elif LOAD_BGR24
fp=fopen("../test_bgr24_320x180.rgb","rb+");
#elif LOAD_YUV420P
fp=fopen("/unit_tests/akiyo_cif.yuv","rb+");
#endif
if(fp==NULL){
printf("cannot open this file\n");
return -1;
}
SDL_Rect sdlRect;
SDL_Thread *refresh_thread = SDL_CreateThread(refresh_video,NULL,NULL);
SDL_Event event;
while(1){
//Wait
SDL_WaitEvent(&event);
if(event.type==REFRESH_EVENT){
if (fread(buffer, 1, pixel_w*pixel_h*bpp/8, fp) != pixel_w*pixel_h*bpp/8){
// Loop
fseek(fp, 0, SEEK_SET);
fread(buffer, 1, pixel_w*pixel_h*bpp/8, fp);
}
#if LOAD_BGRA
//We don't need to change Endian
//Because input BGRA pixel data(B|G|R|A) is same as ARGB8888 in Little Endian (B|G|R|A)
SDL_UpdateTexture( sdlTexture, NULL, buffer, pixel_w*4);
#elif LOAD_RGB24|LOAD_BGR24
//change 24bit to 32 bit
//and in Windows we need to change Endian
CONVERT_24to32(buffer,buffer_convert,pixel_w,pixel_h);
SDL_UpdateTexture( sdlTexture, NULL, buffer_convert, pixel_w*4);
#elif LOAD_YUV420P
SDL_UpdateTexture( sdlTexture, NULL, buffer, pixel_w);
#endif
//FIX: If window is resize
sdlRect.x = 0;
sdlRect.y = 0;
sdlRect.w = screen_w;
sdlRect.h = screen_h;
SDL_RenderClear( sdlRenderer );
SDL_RenderCopy( sdlRenderer, sdlTexture, NULL, &sdlRect);
SDL_RenderPresent( sdlRenderer );
//Delay 40ms
SDL_Delay(40);
}else if(event.type==SDL_WINDOWEVENT){
//If Resize
SDL_GetWindowSize(screen,&screen_w,&screen_h);
}else if(event.type==SDL_QUIT){
break;
}
}
return 0;
}
编译：arm-poky-linux-gnueabi-gcc -o sdl2play sdl2play.c -lSDL2
实例程序编译成功，无错误和警告。
目标机上运行实例出现如下问题：
root@imx6qsabresd:/unit_tests#./sdl2play
libGL error: UNIX signal already caught! libGL error: UNIX signal already caught!
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