videooutsdl.cpp

#include "videooutsdl.h"
namespace LQF {
static bool bSDL_INIT_VIDEO = false;
VideoOutSDL::VideoOutSDL()
{

}

VideoOutSDL::~VideoOutSDL()
{
    if(texture_)
        SDL_DestroyTexture(texture_);
    if(renderer_)
        SDL_DestroyRenderer(renderer_);
    if(win_)
        SDL_DestroyWindow(win_);

    SDL_Quit();
}

RET_CODE VideoOutSDL::Init(const Properties &properties)
{
    video_width_ = properties.GetProperty("video_width", -1);
    if(-1 == video_width_)
    {
        LogError("video_width no set");
        return RET_FAIL;
    }
    video_height_ = properties.GetProperty("video_height", -1);
    if(-1 == video_height_)
    {
        LogError("video_height no set");
        return RET_FAIL;
    }

    pixformat_ = properties.GetProperty("pixformat",SDL_PIXELFORMAT_IYUV);
    win_x_ = properties.GetProperty("win_x", SDL_WINDOWPOS_UNDEFINED);
    win_y_ = properties.GetProperty("win_y", SDL_WINDOWPOS_UNDEFINED);
    win_width_ = properties.GetProperty("win_width", video_width_);
    win_height_ = properties.GetProperty("win_height", video_height_);
    win_title_  = properties.GetProperty("win_title", "sdl display");
    //初始化 SDL
    if(SDL_Init(SDL_INIT_VIDEO))
    {
        LogError("Could not initialize SDL - %s", SDL_GetError());
        return RET_FAIL;
    }
    //创建窗口
    win_ = SDL_CreateWindow(win_title_.c_str(),
                           win_x_,
                           win_y_,
                           win_width_, win_height_,
                           SDL_WINDOW_RESIZABLE);


    if(!win_)
    {
        LogError("SDL: could not create window, err:%s",SDL_GetError());
        return RET_FAIL;
    }

    // 基于窗口创建渲染器
    renderer_ = SDL_CreateRenderer(win_, -1, 0);
    if(!renderer_)
    {
        LogError("SDL: could not create renderer_, err:%s",SDL_GetError());
        return RET_FAIL;
    }
    // 基于渲染器创建纹理
    texture_ = SDL_CreateTexture(renderer_,
                                pixformat_,
                                SDL_TEXTUREACCESS_STREAMING,
                                video_width_,
                                video_height_);
    if(!texture_)
    {
        LogError("SDL: could not create texture_, err:%s",SDL_GetError());
        return RET_FAIL;
    }
    LogInfo("%s init done", win_title_.c_str());
    return RET_OK;
}

RET_CODE VideoOutSDL::Output(const uint8_t *video_buf, const uint32_t size)
{
    // 设置纹理的数据
    SDL_UpdateTexture(texture_, NULL, video_buf, video_width_);

    //FIX: If window is resize
    rect_.x = 0;
    rect_.y = 0;
    rect_.w = video_width_;
    rect_.h = video_height_;

    // 清除当前显示
    if(SDL_RenderClear(renderer_) != 0)
    {
         printf("SDL_RenderCopy failed\n");
        LogError("SDL_RenderClear failed");
        return RET_FAIL;
    }
    // 将纹理的数据拷贝给渲染器
    if(SDL_RenderCopy(renderer_, texture_, NULL, &rect_) != 0)
    {
        printf("SDL_RenderCopy failed\n");
        LogError("SDL_RenderCopy failed");
        return RET_FAIL;
    }
    // 显示
    SDL_RenderPresent(renderer_);
    return RET_OK;
}

}