如何从YUV420p转换ffmpeg编码器的RGB？ [英] How to convert RGB from YUV420p for ffmpeg encoder?

问题描述

我想通过使用c ++代码从位图图像制作.avi视频文件。
我写了以下代码：

I want to make .avi video file from bitmap images by using c++ code. I wrote the following code:

//Get RGB array data from bmp file
uint8_t* rgb24Data = new uint8_t[3*imgWidth*imgHeight];
hBitmap = (HBITMAP) LoadImage( NULL, _T("myfile.bmp"), IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
GetDIBits(hdc, hBitmap, 0, imgHeight, rgb24Data , (BITMAPINFO*)&bmi, DIB_RGB_COLORS);

/* Allocate the encoded raw picture. */
AVPicture dst_picture;
avpicture_alloc(&dst_picture, AV_PIX_FMT_YUV420P, imgWidth, imgHeight);

/* Convert rgb24Data to YUV420p and stored into array dst_picture.data */
RGB24toYUV420P(imgWidth, imgHeight, rgb24Data, dst_picture.data); //How to implement this function?

//code for encode frame dst_picture here

我的问题是如何实现 RGB24toYUV420P（）函数，此函数将将 RGB24 数据从数组rgb24Data转换为 YUV420p 并存储到ffmpeg编码器的数组 dst_picture.data 中

My problem is how to implement RGB24toYUV420P() function, this function will convert RGB24 data from array rgb24Data to YUV420p and store into array dst_picture.data for ffmpeg encoder?

推荐答案

您可以使用SwScale

You can use the SwScale

如下所示：

#include <libswscale/swscale.h>
SwsContext * ctx = sws_getContext(imgWidth, imgHeight,
                                  AV_PIX_FMT_RGB24, imgWidth, imgHeight,
                                  AV_PIX_FMT_YUV420P, 0, 0, 0, 0);
uint8_t * inData[1] = { rgb24Data }; // RGB24 have one plane
int inLinesize[1] = { 3*imgWidth }; // RGB stride
sws_scale(ctx, inData, inLinesize, 0, imgHeight, dst_picture.data, dst_picture.linesize)

请注意，您应该只创建一个 SwsContext 对象的实例，而不是每个框架。

Note that you should create an instance of the SwsContext object only once, not for each frame.

这篇关于如何从YUV420p转换ffmpeg编码器的RGB？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！