android 通过SDL如何显示YUV视频数据呢? 最近下载了V1.3的SDL源程序,并且编译成了so库,但是通过android模拟器使用SDL的库函数显示YUV视频数据时却出现了黑屏现象,无法正常显示视频,不知道是不是编译的SDL库有问题导致的?有没有成功移植到android平台的SDL库呢?或者有没其他的方法能够将底层的音视频流通过模拟器播放显示呢?请各位帮帮忙!谢谢了! 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 sdl是开源的跨平台多媒体开发包, 主要用在快速的视频格式转换和显示,以及封装了键盘/鼠标/手机按键/触屏等各个平台的用户交互响应,广泛应用在游戏,多媒体播放器等应用中。目前支持windows,linux, wince,mac os,非正式地支持symbian os。 一般视频解码器输出图像的是yuv420格式,而屏幕显示大都是rgb42规格。 mobile上画面显示一般经由decode>>yuv2rgb>>scale>>directDraw直接写屏。 采用SDL可以加速这一过程,且更方便响应全屏缩放等用户操作。 下面介绍mobile上用sdl来加速显示视频的全过程。 1. 把主对话框的窗口句柄传给显示类。 2. 初始化sdl,设置显示视频模式 SDL_Surface *screen; SDL_Rect sdl_rect; SDL_Overlay *bmp;bool InitSdl(){ char sdl_var[64]; sprintf(sdl_var, "SDL_WINDOWID=0x%lx", m_hWnd);//主窗口句柄 SDL_putenv(sdl_var); char *myvalue = SDL_getenv("SDL_WINDOWID"); atexit(SDL_Quit); //根据解码后的视频尺寸来初始化sdl screen = SDL_SetVideoMode(ImageWidth, ImageHeight, 0,SDL_ANYFORMAT|SDL_RESIZABLE|SDL_DOUBLEBUF|SDL_HWSURFACE);//注意用到的参数flags if(!screen) { TRACE(L"error SDL SetVideoMode!"); return false; } bmp = SDL_CreateYUVOverlay(ImageWidth, ImageHeight, ,SDL_YV12_OVERLAY,screen); if(!bmp) { TRACE(L"error SDL CreateYUVOverlay!"); return false; } return TRUE; } 3. 在屏幕上绘制像素void SdlDisplayFrame(){ AVPicture pict; pict.data[0] = bmp->pixels[0]; pict.data[1] = bmp->pixels[2]; pict.data[2] = bmp->pixels[1]; pict.linesize[0] = bmp->pitches[0]; pict.linesize[1] = bmp->pitches[2]; pict.linesize[2] = bmp->pitches[1]; //pFrame是ffmpeg存放解码后yuv数据的struct img_convert(&pict, PIX_FMT_YUV420P, (AVPicture *)pFrame, pContext->pix_fmt, iImage_Width, iImage_Height); SDL_LockSurface(screen); SDL_LockYUVOverlay(bmp); { sdl_rect.x = 0; sdl_rect.y = 0; sdl_rect.w = m_width; //pContext->width; sdl_rect.h = m_height; //pContext->height; } SDL_UnlockYUVOverlay(bmp); SDL_UnlockSurface(screen); SDL_DisplayYUVOverlay(bmp, &sdl_rect);//显示图片到屏幕} 4. 事件轮询和按键响应void SdlEvent(){ SDL_Event event; while ( SDL_PollEvent(&event)) { TRACE(L"========SDL VIDEORESIZE EVENT START"); switch (event.type) { case SDL_VIDEORESIZE: // 响应图像缩放事件 if (m_iImage_Width == Image_Primary_Width && m_iImage_Height == Image_Primary_Height) { TRACE(L"event.resize.w = %d",event.resize.w); TRACE(L"event.resize.h = %d",event.resize.h); m_width = event.resize.w; m_height = event.resize.h; SDL_FreeYUVOverlay(bmp); bmp = NULL; SDL_FreeSurface(screen); screen = NULL; if (!IsQcif) { m_height = m_height * 2; m_width = m_width * 2; screen = SDL_SetVideoMode(MobileFullScreenWidth,MobileFullScreenHeight, 0,SDL_ANYFORMAT|SDL_RESIZABLE|SDL_DOUBLEBUF|SDL_HWSURFACE); if (screen == NULL) { TRACE(L"screen= NULL"); return; } bmp = SDL_CreateYUVOverlay(MobileFullScreenWidth,MobileFullScreenHeight, SDL_YV12_OVERLAY,screen); if (bmp == NULL) { TRACE(L"bm1 = NULL"); return; } IsQcif = true; } else { screen = SDL_SetVideoMode(Image_Primary_Width,Image_Primary_Height, 0,SDL_ANYFORMAT|SDL_RESIZABLE|SDL_DOUBLEBUF|SDL_HWSURFACE); if (screen == NULL) { TRACE(L"screen1= NULL"); return; } bmp = SDL_CreateYUVOverlay(Image_Primary_Width,Image_Primary_Height, SDL_YV12_OVERLAY,screen); if (bmp == NULL) { TRACE(L"bm1 = NULL"); return; } IsQcif = false; } break; } case SDL_MOUSEBUTTONDOWN: //响应触屏笔点击事件 break; } case SDL_QUIT: //响应退出事件 break; default: break; } }}-------------------------------------------------------------------------------http://www.jiemengwu.com/ 解梦屋 http://www.phpzy.com/php/ 绿色php资源http://www.shopfw.com网店服务 要做yuv转RGB吧。即便如此,yuv数据直接当rgb显示的话,也不是黑屏。你先将格式设置成rgb模式,看是否真的带起了SDL。android的framebuffer和surface接口,好像第三方程序没有权限使用的,不太清楚你的SDL显示是怎么做的。 AppWidgetProvider启动Activity 在ListView中加载BaseAdapter的getView()方法,加载了十个EditText,当第一个EditText中输入数据后第八个Edittex也有 iNAND(emmc)和mDDR区别 请问如何添加开机声音 关于Android apk的更新 tcp如何组包 求助 安装ADT时出错,啥办? 签名丢失怎么办? 问一个通信问题 样式分私有样式和公开样式吗? 好吃的Android 4.0 SDK下载!更新eclipse的adt插件
SDL_Rect sdl_rect;
SDL_Overlay *bmp;bool InitSdl(){ char sdl_var[64];
sprintf(sdl_var, "SDL_WINDOWID=0x%lx", m_hWnd);//主窗口句柄
SDL_putenv(sdl_var); char *myvalue = SDL_getenv("SDL_WINDOWID"); atexit(SDL_Quit); //根据解码后的视频尺寸来初始化sdl screen = SDL_SetVideoMode(ImageWidth, ImageHeight, 0,SDL_ANYFORMAT|SDL_RESIZABLE|SDL_DOUBLEBUF|SDL_HWSURFACE);//注意用到的参数flags
if(!screen)
{
TRACE(L"error SDL SetVideoMode!");
return false;
} bmp = SDL_CreateYUVOverlay(ImageWidth, ImageHeight, ,SDL_YV12_OVERLAY,screen);
if(!bmp)
{
TRACE(L"error SDL CreateYUVOverlay!");
return false;
} return TRUE; } 3. 在屏幕上绘制像素void SdlDisplayFrame()
{
AVPicture pict; pict.data[0] = bmp->pixels[0];
pict.data[1] = bmp->pixels[2];
pict.data[2] = bmp->pixels[1]; pict.linesize[0] = bmp->pitches[0];
pict.linesize[1] = bmp->pitches[2];
pict.linesize[2] = bmp->pitches[1]; //pFrame是ffmpeg存放解码后yuv数据的struct img_convert(&pict, PIX_FMT_YUV420P, (AVPicture *)pFrame, pContext->pix_fmt, iImage_Width, iImage_Height);
SDL_LockSurface(screen);
SDL_LockYUVOverlay(bmp);
{
sdl_rect.x = 0;
sdl_rect.y = 0;
sdl_rect.w = m_width; //pContext->width;
sdl_rect.h = m_height; //pContext->height; } SDL_UnlockYUVOverlay(bmp);
SDL_UnlockSurface(screen); SDL_DisplayYUVOverlay(bmp, &sdl_rect);//显示图片到屏幕
} 4. 事件轮询和按键响应void SdlEvent()
{ SDL_Event event; while ( SDL_PollEvent(&event))
{
TRACE(L"========SDL VIDEORESIZE EVENT START");
switch (event.type)
{
case SDL_VIDEORESIZE:
// 响应图像缩放事件 if (m_iImage_Width == Image_Primary_Width && m_iImage_Height == Image_Primary_Height)
{
TRACE(L"event.resize.w = %d",event.resize.w);
TRACE(L"event.resize.h = %d",event.resize.h);
m_width = event.resize.w;
m_height = event.resize.h; SDL_FreeYUVOverlay(bmp);
bmp = NULL;
SDL_FreeSurface(screen);
screen = NULL; if (!IsQcif)
{
m_height = m_height * 2;
m_width = m_width * 2;
screen = SDL_SetVideoMode(MobileFullScreenWidth,MobileFullScreenHeight,
0,SDL_ANYFORMAT|SDL_RESIZABLE|SDL_DOUBLEBUF|SDL_HWSURFACE);
if (screen == NULL)
{
TRACE(L"screen= NULL");
return;
} bmp = SDL_CreateYUVOverlay(MobileFullScreenWidth,MobileFullScreenHeight,
SDL_YV12_OVERLAY,screen);
if (bmp == NULL)
{
TRACE(L"bm1 = NULL");
return;
}
IsQcif = true;
}
else
{
screen = SDL_SetVideoMode(Image_Primary_Width,Image_Primary_Height,
0,SDL_ANYFORMAT|SDL_RESIZABLE|SDL_DOUBLEBUF|SDL_HWSURFACE);
if (screen == NULL)
{
TRACE(L"screen1= NULL");
return;
} bmp = SDL_CreateYUVOverlay(Image_Primary_Width,Image_Primary_Height,
SDL_YV12_OVERLAY,screen);
if (bmp == NULL)
{
TRACE(L"bm1 = NULL");
return;
} IsQcif = false;
} break;
} case SDL_MOUSEBUTTONDOWN: //响应触屏笔点击事件
break;
}
case SDL_QUIT:
//响应退出事件
break;
default:
break;
}
}
}
-------------------------------------------------------------------------------
http://www.jiemengwu.com/ 解梦屋 http://www.phpzy.com/php/ 绿色php资源http://www.shopfw.com网店服务
即便如此,yuv数据直接当rgb显示的话,也不是黑屏。
你先将格式设置成rgb模式,看是否真的带起了SDL。android的framebuffer和surface接口,好像第三方程序没有权限使用的,不太清楚你的SDL显示是怎么做的。