一、环境介绍
FFMPEG版本: 4.2.2
测试系统：ubuntu18.04
二、示例代码
代码语言：javascript复制/*
YUYV转QImage格式
*/
QImage YUYV422_TO_QImage(uint8_t *yuyv422,int image_width,int image_height)
{
uint8_t *out_buffer= nullptr;
AVFrame *Input_pFrame= nullptr;
AVFrame *Output_pFrame = nullptr;
struct SwsContext *img_convert_ctx=nullptr; //用于解码后的视频格式转换
/*1. 申请空间*/
Output_pFrame = av_frame_alloc(); //存放RGB数据的缓冲区
Input_pFrame = av_frame_alloc();//存放YUV数据的缓冲区
/*2.设置转码参数*/
img_convert_ctx=sws_getContext(image_width, image_height,AV_PIX_FMT_YUYV422,
image_width, image_height,AV_PIX_FMT_RGB24,
SWS_BICUBIC, nullptr, nullptr, nullptr);
/*3. 申请转码需要空间*/
//获取转码后数据需要的内存空间大小
int numBytes = avpicture_get_size(AV_PIX_FMT_RGB24,image_width,image_height);
//申请空间
out_buffer = (uint8_t *) av_malloc(numBytes * sizeof(uint8_t));
/*4. 设置转码的源数据地址*/
avpicture_fill((AVPicture *) Output_pFrame, out_buffer, AV_PIX_FMT_RGB24,image_width, image_height);
avpicture_fill((AVPicture *) Input_pFrame, yuyv422, AV_PIX_FMT_YUYV422,image_width, image_height);
//转格式
sws_scale(img_convert_ctx,
(uint8_t const **) Input_pFrame->data,
Input_pFrame->linesize, 0, image_height, Output_pFrame->data,
Output_pFrame->linesize);
//加载图片数据
QImage image(out_buffer,image_width,image_height,QImage::Format_RGB888);
//释放空间
if(Input_pFrame)av_free(Input_pFrame);
if(Output_pFrame)av_free(Output_pFrame);
if(out_buffer) av_free(out_buffer);
if(img_convert_ctx)sws_freeContext(img_convert_ctx);
return image.copy();
}
/*
YUYV转YUV420P格式
*/
void YUYV422_TO_YUV420P(uint8_t *yuyv422,uint8_t *yuv420p,int video_width,int video_height)
{
AVFrame *Input_pFrame= nullptr;
AVFrame *Output_pFrame = nullptr;
struct SwsContext *img_convert_ctx=nullptr; //用于解码后的格式转换
/*1. 申请空间*/
Input_pFrame = av_frame_alloc();
Output_pFrame = av_frame_alloc();
/*2.设置转码参数*/
img_convert_ctx=sws_getContext(video_width, video_height,AV_PIX_FMT_YUYV422, //输入
video_width, video_height,AV_PIX_FMT_YUV420P, //输出
SWS_BICUBIC, nullptr, nullptr, nullptr);
/*3. 申请转码需要空间*/
/*4. 设置转码的源数据地址*/
avpicture_fill((AVPicture *) Input_pFrame, yuyv422, AV_PIX_FMT_YUYV422,video_width, video_height);
avpicture_fill((AVPicture *) Output_pFrame, yuv420p, AV_PIX_FMT_YUV420P,video_width, video_height);
//转格式
sws_scale(img_convert_ctx,
(uint8_t const **) Input_pFrame->data,Input_pFrame->linesize,
0, video_height, Output_pFrame->data,Output_pFrame->linesize);
//释放空间
if(Input_pFrame)av_free(Input_pFrame);
if(Output_pFrame)av_free(Output_pFrame);
if(img_convert_ctx)sws_freeContext(img_convert_ctx);
}
/*
YUYV422转RGB888格式
*/
void YUYV422_TO_RGB888(uint8_t *yuyv422,uint8_t *rgb888,int image_width,int image_height)
{
AVFrame *Input_pFrame= nullptr;
AVFrame *Output_pFrame = nullptr;
struct SwsContext *img_convert_ctx=nullptr; //用于解码后的视频格式转换
/*1. 申请空间*/
Output_pFrame = av_frame_alloc(); //存放RGB数据的缓冲区
Input_pFrame = av_frame_alloc();//存放YUV数据的缓冲区
/*2.设置转码参数*/
img_convert_ctx=sws_getContext(image_width, image_height,AV_PIX_FMT_YUYV422,
image_width, image_height,AV_PIX_FMT_RGB24,
SWS_BICUBIC, nullptr, nullptr, nullptr);
/*4. 设置转码的源数据地址*/
avpicture_fill((AVPicture *) Output_pFrame, rgb888, AV_PIX_FMT_RGB24,image_width, image_height);
avpicture_fill((AVPicture *) Input_pFrame, yuyv422, AV_PIX_FMT_YUYV422,image_width, image_height);
//转格式
sws_scale(img_convert_ctx,
(uint8_t const **) Input_pFrame->data,
Input_pFrame->linesize, 0, image_height, Output_pFrame->data,
Output_pFrame->linesize);
//释放空间
if(Input_pFrame)av_free(Input_pFrame);
if(Output_pFrame)av_free(Output_pFrame);
if(img_convert_ctx)sws_freeContext(img_convert_ctx);
}
