libyuv 再次封装打包与测试

上篇文章中进行了libyuv在HI3516平台上的编译和测试。libyuv所处理的数据类型一般都是NV21 YUV420格式。需求端客户要对8位的灰度图像进行放缩处理，同时对外发布版本的时候不能直接告诉客户我们用的是libyuv，所以需要对libyuv进行一次函数接口重新封装，打包成一个我们自己的库对外发布。

一、接口函数

函数目的是对把输入的Y8数据转换成I420送入yuvlib，同时将放缩后的result中的y8抠出来，送出，代码如下：


#include 
#include 
#include 
#include 
#include         
#include "libyuv.h"
#include "y8_resize.h"
 
enum ColorFormat {
    YUV_I420 = 0,
    YUV_NV21,
    YUV_NV12,
    BGR ,
    RGB ,
    BGRA,
    RGBA,
    ABGR,
    ARGB,
  };
 
 
struct Buffer {
    	uint32_t width, height;
    	uint8_t *data[3];
    	uint32_t stride[3];
    	ColorFormat color;
};
 
typedef enum FilterMode {
  kFilterNone = 0,      // Point sample; Fastest.			640*480--3.67
  kFilterLinear = 1,    // Filter horizontally only.
  kFilterBilinear = 2,  // Faster than box, but lower quality scaling down.
  kFilterBox = 3        // Highest quality.
} FilterModeEnum;
 
 
void LibyuvResize_I420(const Buffer *src, Buffer *dst, int mode) 
{
  // you should make complete info of buffer src, stride data width height 
  dst->stride[0] = dst->width;			//stride for y
  dst->stride[1] = dst->width >> 1;		//stride for u
  dst->stride[2] = dst->width >> 1;		//stride for v
  uint32_t dst_y_size = dst->width * dst->height;
  uint32_t dst_u_size = dst->stride[1] * (dst->height >> 1);
  //uint32_t dst_v_size = dst->stride[2] * (dst->height >> 1);
  dst->data[1] = dst->data[0] + dst_y_size;
  dst->data[2] = dst->data[1] + dst_u_size; 
  dst->color = ColorFormat::YUV_I420;  
 
	if(mode==0)
	{
  		libyuv::I420Scale(src->data[0], src->stride[0],
                    src->data[1], src->stride[1],
                    src->data[2], src->stride[2],
                    src->width, src->height,
                    dst->data[0], dst->stride[0],
                    dst->data[1],dst->stride[1],
                    dst->data[2],dst->stride[2],
                    dst->width, dst->height,
                    libyuv::FilterMode::kFilterNone);//
	}else if(mode==1)
	{
  		libyuv::I420Scale(src->data[0], src->stride[0],
                    src->data[1], src->stride[1],
                    src->data[2], src->stride[2],
                    src->width, src->height,
                    dst->data[0], dst->stride[0],
                    dst->data[1],dst->stride[1],
                    dst->data[2],dst->stride[2],
                    dst->width, dst->height,
                    libyuv::FilterMode::kFilterLinear);//
	}else if(mode==2)
	{
  		libyuv::I420Scale(src->data[0], src->stride[0],
                    src->data[1], src->stride[1],
                    src->data[2], src->stride[2],
                    src->width, src->height,
                    dst->data[0], dst->stride[0],
                    dst->data[1],dst->stride[1],
                    dst->data[2],dst->stride[2],
                    dst->width, dst->height,
                    libyuv::FilterMode::kFilterBilinear);//
	}else if(mode == 3)
	{
  		libyuv::I420Scale(src->data[0], src->stride[0],
                    src->data[1], src->stride[1],
                    src->data[2], src->stride[2],
                    src->width, src->height,
                    dst->data[0], dst->stride[0],
                    dst->data[1],dst->stride[1],
                    dst->data[2],dst->stride[2],
                    dst->width, dst->height,
                    libyuv::FilterMode::kFilterBox);//
	}else{
		printf("Mode error \n");
	}
 
}
 
 
int guide_y8_resize(unsigned char *srcImg, 
	int width, int height,
	unsigned char *dstImg, float scale, int mode)
{
	int i,j,k;
	int len  = width*height;
	int len_i420  = width*height + width*height/2;//yyyy u v
	int width_scale = scale * width;
	int height_scale = scale * height;
	int len_scale  = width_scale*height_scale;
 
  unsigned char *image_uv=(unsigned char*)malloc(len/2*sizeof(unsigned char));
	unsigned char *result_uv = (unsigned char*)malloc(len_scale/2*sizeof(unsigned char));
 
	struct Buffer srcBuf, dstBuf;
	srcBuf.color = YUV_I420;
	srcBuf.width = width;
	srcBuf.height = height;
	srcBuf.stride[0] = width;
	srcBuf.stride[1] = width >> 1;
	srcBuf.stride[2] = width >> 1;
	uint32_t src_y_size = len;
  	uint32_t src_u_size = srcBuf.stride[1] * (srcBuf.height >> 1);
	srcBuf.data[0] = srcImg;//image_y8;
	srcBuf.data[1] = image_uv;//srcBuf.data[0] + src_y_size;
	srcBuf.data[2] = srcBuf.data[1] + src_u_size;
 
	dstBuf.width = width_scale;
	dstBuf.height = height_scale;
  uint32_t dst_u_size = width_scale / 2 * height_scale / 2;
	dstBuf.data[0] = dstImg;//result_y8;
  dstBuf.data[1] = result_uv;
  dstBuf.data[2] = dstBuf.data[1] + dst_u_size;
 
	LibyuvResize_I420(&srcBuf, &dstBuf, mode);
 
  free(image_uv);
	free(result_uv);
 
	return 1;
}

二、编译封装

这里分别把编译动态库和静态库的makefile贴出来


#########################################
############ make xx.so
#########################################
 
CHIP = arm-himix200-linux-
#CHIP = arm-linux-gnueabihf-
#CHIP = arm-fsl-linux-gnueabi-
 
CC = $(CHIP)gcc
CXX= $(CHIP)g++
 
objects = y8_resize.o libyuv.a
 
CFLAGS = -O3 -mfpu=neon -mthumb -march=armv7-a -funsafe-math-optimizations -mfloat-abi=softfp 
CFLAGS += -fPIC -shared
CFLAGS += -std=c++11 -Wno-narrowing
 
TOPDIR=.
CFLAGS += -I$(TOPDIR)/include
.PHONY:all
 
 
all:libImage.so 
 
libImage.so: $(objects)
	@echo ------------linking...
	$(CC) $(CFLAGS) -o  $@ $^ -lc  -lpthread -ldl
	@echo ------------ libImage.so over !!!
 
.c.o:
	@echo ------------gcc .c 
	$(CC) $(CFLAGS) -c  $^  
 
.cpp.o:
	@echo ------------g++ .cpp
	$(CXX) $(CFLAGS) -c  -fPIC $^
 
clean:
	rm -f libImage.so *.o; pwd;


###############################
############### make xx.a
################################
 
CHIP = arm-himix200-linux-
#CHIP = arm-linux-gnueabihf-
#CHIP = arm-fsl-linux-gnueabi-
 
CC = $(CHIP)gcc
CXX= $(CHIP)g++
AR = $(CHIP)ar
AS = $(CHIP)as
 
objects = y8_resize.o libyuv.a
 
CFLAGS = -O3 -mfpu=neon -mthumb -march=armv7-a -funsafe-math-optimizations -mfloat-abi=softfp 
CFLAGS += -fPIC -shared
CFLAGS += -std=c++11 -Wno-narrowing
 
TOPDIR=.
CFLAGS += -I$(TOPDIR)/include
.PHONY:all
 
all: libImage.a
 
libImage.a: $(objects)
	@echo ------------linking...
#	$(AR) -o  $@ $^ -lc  -lpthread -ldl
	$(AR)  -crv libyuv.a y8_resize.o
	@echo ------------libImage.a over !!!
 
.c.o:
	@echo ------------gcc .c 
	$(CC) $(CFLAGS) -c  $^  
 
.cpp.o:
	@echo ------------g++ .cpp
	$(CXX) $(CFLAGS) -c  -fPIC $^
 
clean:
	rm -f libImage.a *.o; pwd;

这里需要说明的是，$(AR) -crv libyuv.a y8_resize.o 是把y8_resize.o打包到了libyuv.a中，此时的libyuv.a已经不再是原始的libyuv库中编译出来的libyuv.a。

三、测试

测试代码如下：


#include 
#include 
#include 
#include 
#include         
#include "time.h" 
#include "bmp.h" 
#include 
#include "y8_resize.h" 
 
int main(void)
{
	int i,j,k;
	int width = 384;//256;//384;
	int height = 288;//192;//288;
	int len  = width*height;
	int len_i420  = width*height + width*height/2;//yyyy u v
 
	float time_use=0;
	struct timeval start_time;
	struct timeval end_time;
	struct timeval temp_time;
 
	FILE* fp = fopen("../../../../append_file/car_384288.yuv", "rb");
	// FILE* fp = fopen("../../../append_file/256_192.raw", "rb");//y16
	if (!fp)
		return -1;
 
	unsigned char *image_y8=(unsigned char*)malloc(len*3/2*sizeof(unsigned char));
	unsigned char *image_rgb888=(unsigned char*)malloc(len*3*sizeof(unsigned char));
	// unsigned char *image_i420=(unsigned char*)malloc(len_i420*sizeof(unsigned char));
 
	float scale = 1.5;
	int width_scale = scale * width;
	int height_scale = scale * height;
	int len_scale  = width_scale*height_scale;
	unsigned char *result_y8 = (unsigned char*)malloc(len_scale*3/2*sizeof(unsigned char));
	unsigned char *result_rgb888 = (unsigned char*)malloc(len_scale*3*sizeof(unsigned char));
 
	fread(image_y8, 1, len, fp);
 
	for(i=0;i
	{
		for(j=0;j
		{
			image_rgb888[i*3*width + j*3] = image_y8[i*width+j];
			image_rgb888[i*3*width + j*3 + 1] = image_y8[i*width+j];
			image_rgb888[i*3*width + j*3 + 2] = image_y8[i*width+j];
		}
	}
 
	bmp_creator("123.bmp", image_rgb888, height, width);
 
	for(k=0;k<5;k++)
	{
		gettimeofday(&start_time,NULL);
		guide_y8_resize(image_y8, width, height, result_y8, scale, k);
		gettimeofday(&end_time,NULL);
		time_use = (end_time.tv_sec-start_time.tv_sec)*1000000 + (end_time.tv_usec-start_time.tv_usec);//us
		printf("---- guide_y8_resize mode %d cost %8.2f ms   \n", k, time_use/1000);
	}
 
	for(i=0;i
	{
		for(j=0;j
		{
			result_rgb888[i*3*width_scale + j*3] = result_y8[i*width_scale+j];
			result_rgb888[i*3*width_scale + j*3 + 1] = result_y8[i*width_scale+j];
			result_rgb888[i*3*width_scale + j*3 + 2] = result_y8[i*width_scale+j];
		}
	}
 
	bmp_creator("234.bmp", result_rgb888, height_scale, width_scale);
	
	fclose(fp);
	free(image_y8);
	free(image_rgb888);
	free(result_y8);
	free(result_rgb888);
 
	return 1;
}

app的makefile


objects = test.o bmp.o 
CFLAGS = -O3 -mfpu=neon -mthumb -march=armv7-a -funsafe-math-optimizations -mfloat-abi=softfp 
CFLAGS += -std=c++11 -Wno-narrowing
TOPDIR=.
CFLAGS += -I$(TOPDIR)/include
.PHONY:all
 
all:demo
 
demo: $(objects)
	@echo ------------linking...
#	arm-himix200-linux-g++ $(CFLAGS) -o  $@ $^ -lc -lgomp -lpthread -ldl -L./ -lImage
	arm-himix200-linux-g++ $(CFLAGS) -o  $@ $^ -lc -lgomp -lpthread -ldl -L./ -lyuv
	@echo ------------over !!!
#	cp demo ./bin; mv *.o ./bin
 
.c.o:
	@echo ------------gcc .c 
	arm-himix200-linux-gcc $(CFLAGS) -c  $^  
 
.cpp.o:
	@echo ------------g++ .cpp
	arm-himix200-linux-g++ $(CFLAGS) -c  $^
 
clean:
	rm -f demo *.o; pwd;

测试结果：（测试前请删除前面生成的libImage.so以便验证静态库的有效性）


/mnt/alg_test/libyuv/diy_lib_test/test_lib # ./demo
---- guide_y8_resize mode 0 cost     3.75 ms   
---- guide_y8_resize mode 1 cost     4.78 ms   
---- guide_y8_resize mode 2 cost     9.17 ms   
---- guide_y8_resize mode 3 cost     9.13 ms   
Mode error 
---- guide_y8_resize mode 4 cost     0.06 ms

四、参考文献

Linux 静态库编译和使用

C++静态库与动态库

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原文地址：https://blog.csdn.net/fuhanga123/article/details/126137423