libyuv库实现裁剪和缩放

本文主要是介绍libyuv库实现裁剪和缩放，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

lib实现缩放功能

/** @Description: * @Author: xxx* @Date: 2022-07-13 17:44:57* @LastEditTime: 2022-07-13 20:31:08* @LastEditors: xxx*/
#include <stdio.h>
#include <stdint.h>
#include "libyuv.h"
#include <time.h>
#include <sys/time.h>void scale(uint8_t *srcYuvData, uint8_t *dstYuvData, int width, int height, int dstWidth, int dstHeight) {libyuv::I420Scale(srcYuvData,width,srcYuvData+width*height,(width+1)/2,srcYuvData+width*height+((width+1)/2)*((height+1)/2),(width+1)/2,width,height,dstYuvData,dstWidth,dstYuvData+dstWidth*dstWidth,(dstWidth+1)/2,dstYuvData+dstWidth*dstHeight+((dstWidth+1)/2)*((dstHeight+1)/2),(dstWidth+1)/2,dstWidth,dstHeight,0);
}long NBGetSysTimeUs()  //测试过转换时间
{struct timeval tv;struct timezone tz;gettimeofday(&tv , &tz);return tv.tv_usec;
}int main() {uint32_t width = 500, height = 400;uint32_t dstWidth = 720, dstHeight = 576;uint8_t YUV[width*height*3/2];uint8_t YUV_SCALE[dstWidth*dstHeight*3/2];printf("*****enter \n");FILE *yuv420pFile = fopen("/opt/doctor.nv12", "rb");fread(YUV, sizeof(YUV), 1, yuv420pFile);printf("Today's date start time: %u\n", NBGetSysTimeUs());scale(YUV, YUV_SCALE, width, height, dstWidth, dstHeight);printf("Today's date end time: %u\n", NBGetSysTimeUs());printf("*****enter1 \n");FILE *yuvScaleFile = fopen("/opt/scale-6.nv12", "wb");fwrite(YUV_SCALE, sizeof(YUV_SCALE), 1, yuvScaleFile);fclose(yuvScaleFile);fclose(yuv420pFile);return 0;
}

lib实现裁剪功能

void clip(uint8_t *srcYuvData, uint8_t *dstYuvData, int width, int height, int cropX, int cropY, int cropWidth, int cropHeight) {libyuv::ConvertToI420(srcYuvData,width*height*3/2,dstYuvData,cropWidth,dstYuvData+cropWidth*cropHeight,(cropWidth+1)/2,dstYuvData+cropWidth*cropHeight+((cropWidth+1)/2)*((cropHeight+1)/2),(cropWidth+1)/2,cropX,cropY,width,height,cropWidth,cropHeight,0,FOURCC('Y', 'U', '1', '2'));
}int main() {uint32_t width = 1000, height = 940;uint32_t clipWidth = 720, clipHeight = 576;uint8_t YUV[width*height*3/2];uint8_t YUV_CLIP[clipWidth*clipHeight*3/2];// printf("*****enter \n");FILE *yuv420pFile = fopen("/opt/doctor.nv12", "rb");fread(YUV, sizeof(YUV), 1, yuv420pFile);// printf("*****enter2 \n");clip(YUV, YUV_CLIP, width, height, 0, 0, clipWidth, clipHeight);//  printf("*****enter3 \n");FILE *yuvClipFile = fopen("/opt/rainbow.yuv", "wb");fwrite(YUV_CLIP, sizeof(YUV_CLIP), 1, yuvClipFile);printf("*****enter4 \n");fclose(yuvClipFile);fclose(yuv420pFile);return 0;
}

当时测试完后做了个静态库Makefile和函数如下

CONFIG_UCLIBC_BUILD=yCROSS_COMPILE ?= mips-linux-uclibc-gnu-CC = $(CROSS_COMPILE)gcc
CPLUSPLUS = $(CROSS_COMPILE)g++
LD = $(CROSS_COMPILE)ld
AR = $(CROSS_COMPILE)ar
STRIP = $(CROSS_COMPILE)stripCFLAGS = $(INCLUDES) -O2 -Wall -march=mips32r2ifeq ($(CONFIG_UCLIBC_BUILD), y)
CFLAGS += -muclibc
LDFLAG += -muclibc
endifCFLAGS += -fpermissive
CXXFLAGS += -fpermissiveSDK_LIB_DIR = ${PWD}/include
INCLUDES = -I$(SDK_LIB_DIR)
INCLUDES += -I$(SDK_LIB_DIR)/libyuv/LDFLAG = -Wl,-gc-sectionsYUV_LIB_DIR = -L.
LIBS = $(YUV_LIB_DIR)/libyuv.aC_SRCS=$(wildcard *.c)
C_OBJS=${C_SRCS:%.c=%.o}CXX_SRCS=$(wildcard *.cpp)
CXX_OBJS=${CXX_SRCS:%.cpp=%.o}SAMPLES = libyuvsample.aall: $(SAMPLES)$(SAMPLES): $(HISILIBS) $(C_OBJS) $(CXX_OBJS)$(AR) -rcs $@ $^%.o : %.c$(CC) $(CFLAGS) $(INCLUDES) -c $< -o $@%.o : %.cpp $(CPLUSPLUS) $(CXXFLAGS) -c $< -o $@ $(INCLUDES)clean:rm -f *.o *~distclean: cleanrm -f $(SAMPLES)

库封装接口函数：

/** @Description: * @Author: xxx* @Date: 2022-07-13 17:44:57* @LastEditTime: 2022-07-13 20:31:08* @LastEditors: xxx*/
#include <stdio.h>
#include <stdint.h>
#include "libyuv.h"
extern "C" {void send_data_scale_affine(int scale_w, int scale_h, uint8_t *srcYuvData, uint8_t *dstYuvData, int width, int height);void send_data_clip_affine(int clip_w, int clip_h, uint8_t *srcYuvData, uint8_t *dstYuvData, int width, int height, int cropX, int cropY);
}void scale(uint8_t *srcYuvData, uint8_t *dstYuvData, int width, int height, int dstWidth, int dstHeight) {libyuv::I420Scale(srcYuvData,width,srcYuvData+width*height,(width+1)/2,srcYuvData+width*height+((width+1)/2)*((height+1)/2),(width+1)/2,width,height,dstYuvData,dstWidth,dstYuvData+dstWidth*dstWidth,(dstWidth+1)/2,dstYuvData+dstWidth*dstHeight+((dstWidth+1)/2)*((dstHeight+1)/2),(dstWidth+1)/2,dstWidth,dstHeight,0);
}void clip(uint8_t *srcYuvData, uint8_t *dstYuvData, int width, int height, int cropX, int cropY, int cropWidth, int cropHeight) {libyuv::ConvertToI420(srcYuvData,width*height*3/2,dstYuvData,cropWidth,dstYuvData+cropWidth*cropHeight,(cropWidth+1)/2,dstYuvData+cropWidth*cropHeight+((cropWidth+1)/2)*((cropHeight+1)/2),(cropWidth+1)/2,cropX,cropY,width,height,cropWidth,cropHeight,0,FOURCC('Y', 'U', '1', '2'));
}void send_data_scale_affine(int scale_w, int scale_h, uint8_t *srcYuvData, uint8_t *dstYuvData, int width, int height)
{scale(srcYuvData, dstYuvData, width, height, scale_w, scale_h);
}void send_data_clip_affine(int clip_w, int clip_h, uint8_t *srcYuvData, uint8_t *dstYuvData, int width, int height, int cropX, int cropY) 
{clip(srcYuvData, dstYuvData, width, height, cropX, cropY, clip_w, clip_h);
}

这篇关于libyuv库实现裁剪和缩放的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！

---