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视音频数据处理入门：颜色空间(二)---ffmpeg

news 2026/2/10 23:18:33

概述

流程

概述

本篇简单说一下基于FFmpeg的libswscale的颜色空间转换；Libswscale里面实现了各种图像像素格式的转换，例如：YUV与RGB之间的转换等；这里简单说以下Libswscale的颜色空间转换的使用方法。

流程

初始化方法

初始化SwsContext我们这里选用sws_getContext()；除了上述函数之外还有另一种方法，更加灵活，可以配置更多的参数。该方法调用的函数如下所示：
1) sws_alloc_context()：为SwsContext结构体分配内存。
2) av_opt_set_XXX()：通过av_opt_set_int()，av_opt_set()…等等一系列方法设置SwsContext结构体的值。在这里需要注意，SwsContext结构体的定义看不到，所以不能对其中的成员变量直接进行赋值，必须通过av_opt_set()这类的API才能对其进行赋值。
3) sws_init_context()：初始化SwsContext结构体。
与第一种方式相比这种复杂的方法可以配置一些sws_getContext()配置不了的参数。比如说设置图像的YUV像素的取值范围是JPEG标准（Y、U、V取值范围都是0-255）还是MPEG标准（Y取值范围是16-235，U、V的取值范围是16-240）。

初始化代码

m_imgConvertCtx = sws_getContext(cfg->srcWide, cfg->srcHigh, srcIter->second,cfg->dstWide, cfg->dstHigh, dstIter->second, SWS_BICUBIC, NULL, NULL, NULL);

转换方法

对于转换函数就没有特别说明的了调用sws_scale();值得注意就是这个函数的参数的传递需要按照对应的颜色空间进行排列；

转换代码

sws_scale(m_imgConvertCtx, m_srcPointers, m_srcLinesizes, 0, m_srcHigh, m_dstPointers, m_dstLinesizes);

释放方法

if (nullptr != m_imgConvertCtx){sws_freeContext(m_imgConvertCtx);}m_imgConvertCtx = nullptr;

整体代码介绍

对应FFmpeg 颜色空间转换的demo这边封装成了一个类函数，主要提供了 NV12、NV21、YUV420P、YUV422P、RGB24、RGBA相互转换功能。如需扩展则实现对应函数即可。

头文件:ColorConversionFFmpeg.h

/*** FFmpeg的颜色空间转换* YUV Transformation** 梁启东 qidong.liang* 18088708700@163.com* https://blog.csdn.net/u011645307*** 本程序实现了FFmpeg的YUV数据之间的转换和YUV与RGB的转换。* 提供了如下：* 	FFMPEG_AV_PIX_FMT_NOKNOW,*	FFMPEG_AV_PIX_FMT_NV12,*	FFMPEG_AV_PIX_FMT_NV21,*	FFMPEG_AV_PIX_FMT_YUV420P,*	FFMPEG_AV_PIX_FMT_YUV422P,*	FFMPEG_AV_PIX_FMT_RGB24,*	FFMPEG_AV_PIX_FMT_RGBA*  相互转换功能*/
#ifndef COLOR_CONVERSION_FFMPEG_H
#define	COLOR_CONVERSION_FFMPEG_H#ifdef _WIN32
//Windows
extern "C"
{
#include "libswscale/swscale.h"
#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
};
#else
//Linux...
#ifdef __cplusplus
extern "C"
{
#endif
#include <libavutil/opt.h>
#include <libswscale/swscale.h>
#include <libavutil/imgutils.h>
#ifdef __cplusplus
};
#endif
#endif#include <map>
#include <functional>#ifndef FFMPEG_PIX_FORMAT
#define	FFMPEG_PIX_FORMAT
typedef enum FFmpegAVPixelFormat
{FFMPEG_AV_PIX_FMT_NOKNOW,FFMPEG_AV_PIX_FMT_NV12,FFMPEG_AV_PIX_FMT_NV21,FFMPEG_AV_PIX_FMT_YUV420P,FFMPEG_AV_PIX_FMT_YUV422P,FFMPEG_AV_PIX_FMT_RGB24,FFMPEG_AV_PIX_FMT_RGBA}FFmpegAVPixelFormat;#endif//FFMPEG_PIX_FORMAT
#ifndef FFMPEG_SCALE_CONFIG
#define	FFMPEG_SCALE_CONFIG
typedef struct FFmpegSwscaleConfig
{unsigned int srcWide;unsigned int srcHigh;FFmpegAVPixelFormat srcFormat;unsigned int dstWide;unsigned int dstHigh;FFmpegAVPixelFormat dstFormat;FFmpegSwscaleConfig(){srcWide = 0;srcHigh = 0;srcFormat = FFMPEG_AV_PIX_FMT_NOKNOW;dstWide = 0;dstHigh = 0;dstFormat = FFMPEG_AV_PIX_FMT_NOKNOW;}
}FFmpegSwscaleConfig;
#endif // !FFMPEG_SCALE_CONFIGclass ColorConversionFFmpeg
{
public:ColorConversionFFmpeg();~ColorConversionFFmpeg();long Init(FFmpegSwscaleConfig* cfg);long Conversion(const char* inputBuff, char* outputBuff);long UnInit();private:long BuffToAVPixFmtYUV420P(char* inputBuff, unsigned char** pixBuff);long BuffToAVPixFmtRGBA(char* inputBuff, unsigned char** pixBuff);long BuffToAVPixFmtRGB24(char* inputBuff, unsigned char** pixBuff);long BuffToAVPixFmtNV12(char* inputBuff, unsigned char** pixBuff);long BuffToAVPixFmtNV21(char* inputBuff, unsigned char** pixBuff);long BuffToAVPixFmtYUV422P(char* inputBuff, unsigned char** pixBuff);long AVPixFmtYUV420PToBuff(unsigned char** pixBuff, char* outputBuff);long AVPixFmtNV12ToBuff(unsigned char** pixBuff, char* outputBuff);long AVPixFmtNV21ToBuff(unsigned char** pixBuff, char* outputBuff);long AVPixFmtYUV422PToBuff(unsigned char** pixBuff, char* outputBuff);long AVPixFmtRGB24ToBuff(unsigned char** pixBuff, char* outputBuff);long AVPixFmtRGBAToBuff(unsigned char** pixBuff, char* outputBuff);private:SwsContext* m_imgConvertCtx;uint8_t* m_srcPointers[4]{ nullptr,nullptr,nullptr,nullptr };int m_srcLinesizes[4]{0,0,0,0};uint8_t* m_dstPointers[4]{ nullptr,nullptr,nullptr,nullptr };int m_dstLinesizes[4]{ 0,0,0,0 };int m_srcHigh;int m_srcWide;std::function < long(char* inputBuff, unsigned char** pixBuff) > m_infun;std::function < long(unsigned char** pixBuff, char* outputBuff) > m_outfun;std::map<FFmpegAVPixelFormat, AVPixelFormat>			m_PixelFormatMap;std::map<FFmpegAVPixelFormat,std::function < long(char* inputBuff,unsigned char** pixBuff) >>					    m_srcFormatFunMap;std::map<FFmpegAVPixelFormat,std::function < long(unsigned char** pixBuff,char* outputBuff) >>						    m_dstFormatFunMap;
};
#endif//COLOR_CONVERSION_FFMPEG_H

源文件：ColorConversionFFmpeg.cpp

#include "ColorConversionFFmpeg.h"ColorConversionFFmpeg::ColorConversionFFmpeg(): m_imgConvertCtx(nullptr), m_infun(nullptr), m_outfun(nullptr), m_srcHigh(0), m_srcWide(0)
{m_PixelFormatMap.insert(std::pair<FFmpegAVPixelFormat, AVPixelFormat>(FFMPEG_AV_PIX_FMT_NV12, AV_PIX_FMT_NV12));m_PixelFormatMap.insert(std::pair<FFmpegAVPixelFormat, AVPixelFormat>(FFMPEG_AV_PIX_FMT_NV21, AV_PIX_FMT_NV21));m_PixelFormatMap.insert(std::pair<FFmpegAVPixelFormat, AVPixelFormat>(FFMPEG_AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV420P));m_PixelFormatMap.insert(std::pair<FFmpegAVPixelFormat, AVPixelFormat>(FFMPEG_AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV422P));m_PixelFormatMap.insert(std::pair<FFmpegAVPixelFormat, AVPixelFormat>(FFMPEG_AV_PIX_FMT_RGB24, AV_PIX_FMT_RGB24));m_PixelFormatMap.insert(std::pair<FFmpegAVPixelFormat, AVPixelFormat>(FFMPEG_AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA));m_srcFormatFunMap[FFMPEG_AV_PIX_FMT_NV12] = std::bind(&ColorConversionFFmpeg::BuffToAVPixFmtNV12,this,std::placeholders::_1,std::placeholders::_2);m_srcFormatFunMap[FFMPEG_AV_PIX_FMT_NV21] = std::bind(&ColorConversionFFmpeg::BuffToAVPixFmtNV21,this,std::placeholders::_1,std::placeholders::_2);m_srcFormatFunMap[FFMPEG_AV_PIX_FMT_YUV420P] = std::bind(&ColorConversionFFmpeg::BuffToAVPixFmtYUV420P,this,std::placeholders::_1,std::placeholders::_2);m_srcFormatFunMap[FFMPEG_AV_PIX_FMT_YUV422P] = std::bind(&ColorConversionFFmpeg::BuffToAVPixFmtYUV422P,this,std::placeholders::_1,std::placeholders::_2);m_srcFormatFunMap[FFMPEG_AV_PIX_FMT_RGB24] = std::bind(&ColorConversionFFmpeg::BuffToAVPixFmtRGB24,this,std::placeholders::_1,std::placeholders::_2);m_srcFormatFunMap[FFMPEG_AV_PIX_FMT_RGBA] = std::bind(&ColorConversionFFmpeg::BuffToAVPixFmtRGBA,this,std::placeholders::_1,std::placeholders::_2);m_dstFormatFunMap[FFMPEG_AV_PIX_FMT_NV12] = std::bind(&ColorConversionFFmpeg::AVPixFmtNV12ToBuff,this,std::placeholders::_1,std::placeholders::_2);m_dstFormatFunMap[FFMPEG_AV_PIX_FMT_NV21] = std::bind(&ColorConversionFFmpeg::AVPixFmtNV21ToBuff,this,std::placeholders::_1,std::placeholders::_2);m_dstFormatFunMap[FFMPEG_AV_PIX_FMT_YUV420P] = std::bind(&ColorConversionFFmpeg::AVPixFmtYUV420PToBuff,this,std::placeholders::_1,std::placeholders::_2);m_dstFormatFunMap[FFMPEG_AV_PIX_FMT_YUV422P] = std::bind(&ColorConversionFFmpeg::AVPixFmtYUV422PToBuff,this,std::placeholders::_1,std::placeholders::_2);m_dstFormatFunMap[FFMPEG_AV_PIX_FMT_RGB24] = std::bind(&ColorConversionFFmpeg::AVPixFmtRGB24ToBuff,this,std::placeholders::_1,std::placeholders::_2);m_dstFormatFunMap[FFMPEG_AV_PIX_FMT_RGBA] = std::bind(&ColorConversionFFmpeg::AVPixFmtRGBAToBuff,this,std::placeholders::_1,std::placeholders::_2);}ColorConversionFFmpeg::~ColorConversionFFmpeg()
{m_PixelFormatMap.clear();m_srcFormatFunMap.clear();m_dstFormatFunMap.clear();}long ColorConversionFFmpeg::Init(FFmpegSwscaleConfig* cfg)
{if (nullptr == cfg){return -1;}auto srcIter = m_PixelFormatMap.find(cfg->srcFormat);auto dstIter = m_PixelFormatMap.find(cfg->dstFormat);if (srcIter == m_PixelFormatMap.end() ||dstIter == m_PixelFormatMap.end()){return -2;}auto srcFormatFunIter = m_srcFormatFunMap.find(cfg->srcFormat);auto dstFormatFunIter = m_dstFormatFunMap.find(cfg->dstFormat);if (dstFormatFunIter == m_dstFormatFunMap.end() ||srcFormatFunIter == m_srcFormatFunMap.end()){return -3;}m_infun = srcFormatFunIter->second;m_outfun = dstFormatFunIter->second;int nSrctBuffLen = 0, nDstBuffLen = 0;nSrctBuffLen = av_image_alloc(m_srcPointers, m_srcLinesizes, cfg->srcWide, cfg->srcHigh, srcIter->second, 1);if (nSrctBuffLen <= 0){return -4;}nDstBuffLen = av_image_alloc(m_dstPointers, m_dstLinesizes, cfg->dstWide, cfg->dstHigh, dstIter->second, 1);if (nDstBuffLen <= 0 ){av_freep(&m_srcPointers[0]);return -5;}m_imgConvertCtx = sws_getContext(cfg->srcWide, cfg->srcHigh, srcIter->second,cfg->dstWide, cfg->dstHigh, dstIter->second, SWS_BICUBIC, NULL, NULL, NULL);if (nullptr == m_imgConvertCtx){av_freep(&m_srcPointers);av_freep(&m_dstPointers);return -6;}m_srcHigh = cfg->srcHigh;m_srcWide = cfg->srcWide;return 0;
}long ColorConversionFFmpeg::Conversion(const char* inputBuff, char* outputBuff)
{if (nullptr == m_infun ||nullptr == m_outfun ||nullptr == m_dstPointers[0] ||nullptr == m_srcPointers[0] ||nullptr == m_imgConvertCtx){return 0;}m_infun(const_cast<char*>(inputBuff), m_srcPointers);sws_scale(m_imgConvertCtx, m_srcPointers, m_srcLinesizes, 0, m_srcHigh, m_dstPointers, m_dstLinesizes);m_outfun(m_dstPointers, outputBuff);return 0;
}long ColorConversionFFmpeg::UnInit()
{if (m_srcPointers){av_freep(&m_srcPointers);}if (m_dstPointers){av_freep(&m_dstPointers);}m_dstPointers[0] = nullptr;m_srcPointers[0] = nullptr;if (nullptr != m_imgConvertCtx){sws_freeContext(m_imgConvertCtx);}m_imgConvertCtx = nullptr;m_outfun = nullptr;m_infun = nullptr;return 0;
}long ColorConversionFFmpeg::BuffToAVPixFmtYUV420P(char* inputBuff, unsigned char** pixBuff)
{memcpy(pixBuff[0], inputBuff, static_cast<size_t>(m_srcWide * m_srcHigh));											//Ymemcpy(pixBuff[1], inputBuff + m_srcWide * m_srcHigh, m_srcWide * m_srcHigh / 4);				//Umemcpy(pixBuff[2], inputBuff + m_srcWide * m_srcHigh * 5 / 4, m_srcWide * m_srcHigh / 4);		//Vreturn 0;
}long ColorConversionFFmpeg::BuffToAVPixFmtRGBA(char* inputBuff, unsigned char** pixBuff)
{memcpy(pixBuff[0], inputBuff, m_srcWide * m_srcHigh*4);return 0;
}long ColorConversionFFmpeg::BuffToAVPixFmtRGB24(char* inputBuff, unsigned char** pixBuff)
{memcpy(pixBuff[0], inputBuff, m_srcWide * m_srcHigh * 3);return 0;
}long ColorConversionFFmpeg::BuffToAVPixFmtNV12(char* inputBuff, unsigned char** pixBuff)
{memcpy(pixBuff[0], inputBuff, m_srcHigh*m_srcWide);                    //Ymemcpy(pixBuff[1], inputBuff + m_srcHigh * m_srcWide, m_srcHigh*m_srcWide / 2);      //Uvreturn 0;
}long ColorConversionFFmpeg::BuffToAVPixFmtNV21(char* inputBuff, unsigned char** pixBuff)
{memcpy(pixBuff[0], inputBuff, m_srcHigh * m_srcWide);                    //Ymemcpy(pixBuff[1], inputBuff + m_srcHigh * m_srcWide, m_srcHigh * m_srcWide / 2);      //Uvreturn 0;
}long ColorConversionFFmpeg::BuffToAVPixFmtYUV422P(char* inputBuff, unsigned char** pixBuff)
{memcpy(pixBuff[0], inputBuff, m_srcWide * m_srcHigh);											//Ymemcpy(pixBuff[1], inputBuff + m_srcWide * m_srcHigh, m_srcWide * m_srcHigh / 2);				//Umemcpy(pixBuff[2], inputBuff + m_srcWide * m_srcHigh * 3 / 2, m_srcWide * m_srcHigh / 2);		//Vreturn 0;
}long ColorConversionFFmpeg::AVPixFmtYUV420PToBuff(unsigned char** pixBuff, char* outputBuff)
{memcpy(outputBuff, pixBuff[0], m_srcWide * m_srcHigh);											//Ymemcpy(outputBuff + m_srcWide * m_srcHigh, pixBuff[1], m_srcWide * m_srcHigh / 4);				//Umemcpy(outputBuff + m_srcWide * m_srcHigh * 5 / 4, pixBuff[2], m_srcWide * m_srcHigh / 4);		//Vreturn 0;
}long ColorConversionFFmpeg::AVPixFmtNV12ToBuff(unsigned char** pixBuff, char* outputBuff)
{memcpy( outputBuff, pixBuff[0], m_srcHigh * m_srcWide);                    //Ymemcpy( outputBuff + m_srcHigh * m_srcWide, pixBuff[1], m_srcHigh * m_srcWide / 2);      //Uvreturn 0;
}long ColorConversionFFmpeg::AVPixFmtNV21ToBuff(unsigned char** pixBuff, char* outputBuff)
{memcpy(outputBuff, pixBuff[0], m_srcHigh * m_srcWide);                    //Ymemcpy(outputBuff + m_srcHigh * m_srcWide, pixBuff[1], m_srcHigh * m_srcWide / 2);      //Uvreturn 0;
}long ColorConversionFFmpeg::AVPixFmtYUV422PToBuff(unsigned char** pixBuff, char* outputBuff)
{memcpy(outputBuff, pixBuff[0], m_srcWide * m_srcHigh);											//Ymemcpy(outputBuff + m_srcWide * m_srcHigh, pixBuff[1], m_srcWide * m_srcHigh / 2);				//Umemcpy(outputBuff + m_srcWide * m_srcHigh * 3 / 2, pixBuff[2], m_srcWide * m_srcHigh / 2);		//Vreturn 0;
}long ColorConversionFFmpeg::AVPixFmtRGB24ToBuff(unsigned char** pixBuff, char* outputBuff)
{memcpy(outputBuff, pixBuff[0], m_srcWide * m_srcHigh * 3);return 0;
}long ColorConversionFFmpeg::AVPixFmtRGBAToBuff(unsigned char** pixBuff, char* outputBuff)
{memcpy(outputBuff, pixBuff[0], m_srcWide * m_srcHigh * 4);return 0;
}

测试文件：main.cpp

/**
* FFmpeg的颜色空间转换的测试程序
* YUV Transformation
*
* 梁启东 qidong.liang
* 18088708700@163.com
* https://blog.csdn.net/u011645307
*
*
* FFmpeg的颜色空间转换的测试程序
*/#include <iostream>
#include "ColorConversionFFmpeg.h"#define NV12_To_I420	0
#define I420_To_NV12	0
#define NV21_To_I420	0
#define I420_To_NV21	0
#define I420_To_RGB32	0
#define RGB32_To_I420	0
#define I420_To_RGB24	0
#define RGB24_To_I420	0
#define NV12_To_YUV422P	0
#define YUV422P_To_NV12	1
int main()
{FILE* file_in = nullptr;FILE* file_out = nullptr;char* input_name = nullptr;char* output_name = nullptr;int w = 0, h = 0;float flotScale = 0;int out_w = 0, out_h = 0;float out_flotScale = 0;FFmpegSwscaleConfig cfg;ColorConversionFFmpeg obj;#if NV12_To_YUV422Pinput_name = const_cast<char*>("../in/nv21_480x272.yuv");output_name = const_cast<char*>("../out/yuvv422p_480x272.yuv");cfg.srcWide = 480;cfg.dstWide = 480;cfg.dstHigh = 272;cfg.srcHigh = 272;cfg.srcFormat = FFMPEG_AV_PIX_FMT_NV12;cfg.dstFormat = FFMPEG_AV_PIX_FMT_YUV422P;w = 480;h = 272;flotScale = 1.5;out_w = 480;out_h = 272;out_flotScale = 2;#endif#if YUV422P_To_NV12input_name = const_cast<char*>("../in/YV16(422)_480x272.yuv");output_name = const_cast<char*>("../out/nv21_480x272.yuv");cfg.srcWide = 480;cfg.dstWide = 480;cfg.dstHigh = 272;cfg.srcHigh = 272;cfg.srcFormat = FFMPEG_AV_PIX_FMT_YUV422P;cfg.dstFormat = FFMPEG_AV_PIX_FMT_NV12;w = 480;h = 272;flotScale = 2;out_w = 480;out_h = 272;out_flotScale = 1.5;#endif#if NV21_To_I420input_name = const_cast<char*>("../in/nv21_480x272.yuv");output_name = const_cast<char*>("../out/I420_480x272.yuv");cfg.srcWide = 480;cfg.dstWide = 480;cfg.dstHigh = 272;cfg.srcHigh = 272;cfg.srcFormat = FFMPEG_AV_PIX_FMT_NV21;cfg.dstFormat = FFMPEG_AV_PIX_FMT_YUV420P;w = 480;h = 272;flotScale = 1.5;out_w = 480;out_h = 272;out_flotScale = 1.5;#endif#if I420_To_NV21input_name = const_cast<char*>("../in/I420_480x272.yuv");output_name = const_cast<char*>("../out/nv21_480x272.yuv");cfg.srcWide = 480;cfg.dstWide = 480;cfg.dstHigh = 272;cfg.srcHigh = 272;cfg.srcFormat = FFMPEG_AV_PIX_FMT_YUV420P;cfg.dstFormat = FFMPEG_AV_PIX_FMT_NV21;w = 480;h = 272;flotScale = 1.5;out_w = 480;out_h = 272;out_flotScale = 1.5;#endif#if NV12_To_I420input_name = const_cast<char*>("../in/nv12_480x272.yuv");output_name = const_cast<char*>("../out/I420_480x272.yuv");cfg.srcWide = 480;cfg.dstWide = 480;cfg.dstHigh = 272;cfg.srcHigh = 272;cfg.srcFormat = FFMPEG_AV_PIX_FMT_NV12;cfg.dstFormat = FFMPEG_AV_PIX_FMT_YUV420P;w = 480;h = 272;flotScale = 1.5;out_w = 480;out_h = 272;out_flotScale = 1.5;#endif#if I420_To_NV12input_name = const_cast<char*>("../in/I420_480x272.yuv");output_name = const_cast<char*>("../out/nv12_480x272.yuv");cfg.srcWide = 480;cfg.dstWide = 480;cfg.dstHigh = 272;cfg.srcHigh = 272;cfg.srcFormat = FFMPEG_AV_PIX_FMT_YUV420P;cfg.dstFormat = FFMPEG_AV_PIX_FMT_NV12;w = 480;h = 272;flotScale = 1.5;out_w = 480;out_h = 272;out_flotScale = 1.5;#endif#if I420_To_RGB24input_name = const_cast<char*>("../in/I420_480x272.yuv");output_name = const_cast<char*>("../out/rgb_480x272.rgb");w = 480;h = 272;flotScale = 1.5;out_w = 480;out_h = 272;out_flotScale = 3;cfg.srcWide = w;cfg.dstWide = out_w;cfg.dstHigh = out_h;cfg.srcHigh = h;cfg.srcFormat = FFMPEG_AV_PIX_FMT_YUV420P;cfg.dstFormat = FFMPEG_AV_PIX_FMT_RGB24;#endif#if RGB24_To_I420input_name = const_cast<char*>("../in/rgb_480x272.rgb");output_name = const_cast<char*>("../out/I420_480x272.yuv");w = 480;h = 272;flotScale = 3;out_w = 480;out_h = 272;out_flotScale = 1.5;cfg.srcWide = w;cfg.dstWide = out_w;cfg.dstHigh = out_h;cfg.srcHigh = h;cfg.dstFormat = FFMPEG_AV_PIX_FMT_YUV420P;cfg.srcFormat = FFMPEG_AV_PIX_FMT_RGB24;#endif#if I420_To_RGB32input_name = const_cast<char*>("../in/I420_480x272.yuv");output_name = const_cast<char*>("../out/rgba_480x272.rgb");w = 480;h = 272;flotScale = 1.5;out_w = 480;out_h = 272;out_flotScale = 4;cfg.srcWide = w;cfg.dstWide = out_w;cfg.dstHigh = out_h;cfg.srcHigh = h;cfg.srcFormat = FFMPEG_AV_PIX_FMT_YUV420P;cfg.dstFormat = FFMPEG_AV_PIX_FMT_RGBA;#endif#if RGB32_To_I420input_name = const_cast<char*>("../in/rgba_480x272.rgb");output_name = const_cast<char*>("../out/I420_480x272.yuv");w = 480;h = 272;flotScale = 4;out_w = 480;out_h = 272;out_flotScale = 1.5;cfg.srcWide = w;cfg.dstWide = out_w;cfg.dstHigh = out_h;cfg.srcHigh = h;cfg.dstFormat = FFMPEG_AV_PIX_FMT_YUV420P;cfg.srcFormat = FFMPEG_AV_PIX_FMT_RGBA;#endifint in_buff_len = w * h * flotScale;int out_buff_len = out_w * out_h * out_flotScale;char* inbuff = new char[in_buff_len];char* outbuff = new char[out_buff_len];fopen_s(&file_in, input_name, "rb+");fopen_s(&file_out, output_name, "wb+");int ret = obj.Init(&cfg);if (0 != ret){printf("ColorConversionFFmpeg::Init ret:%d\n", ret);fclose(file_in);fclose(file_out);file_in = nullptr;file_out = nullptr;return -1;}while (true){if (fread(inbuff, 1, in_buff_len, file_in) != in_buff_len){break;}ret = obj.Conversion(inbuff, outbuff);if (0 != ret){printf("ColorConversionFFmpeg::Conversion ret:%d\n", ret);continue;}fwrite(outbuff, 1, out_buff_len, file_out);}ret = obj.UnInit();if (0 != ret){printf("ColorConversionFFmpeg::UnInit ret:%d\n", ret);}fclose(file_in);fclose(file_out);file_in = nullptr;file_out = nullptr;std::cout << "Hello World!\n";
}

代码路径

csdn:https://download.csdn.net/download/u011645307/21739481?spm=1001.2014.3001.5501

github:https://github.com/liangqidong/ColorConversion.git

概述

流程

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