目录
1 main.cpp
2 Makefile
1 main.cpp
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "jpeglib.h"
int clipNv12ToJpgFile(const char *pFileName,unsigned char* pYUVBuffer, const int nWidth, const int nHeight)
{struct jpeg_compress_struct cinfo;struct jpeg_error_mgr jerr;JSAMPROW row_pointer[1]; FILE * pJpegFile = NULL;unsigned char *yuvbuf = NULL;unsigned char *ybase = NULL, *ubase = NULL;int i=0, j=0;int idx=0;cinfo.err = jpeg_std_error(&jerr);jpeg_create_compress(&cinfo);if ((pJpegFile = fopen(pFileName, "wb")) == NULL){ return -1;} jpeg_stdio_dest(&cinfo, pJpegFile);// image width and height, in pixelscinfo.image_width = nWidth;cinfo.image_height = nHeight; cinfo.input_components = 3; // # of color components per pixelcinfo.in_color_space = JCS_YCbCr; //colorspace of input imagejpeg_set_defaults(&cinfo);jpeg_set_quality(&cinfo, 85, TRUE );cinfo.jpeg_color_space = JCS_YCbCr;cinfo.comp_info[0].h_samp_factor = 2;cinfo.comp_info[0].v_samp_factor = 2;jpeg_start_compress(&cinfo, TRUE);if(!(yuvbuf=(unsigned char *)malloc(nWidth*3))!=NULL){return -1;}memset(yuvbuf, 0, nWidth*3);ybase=pYUVBuffer;ubase=pYUVBuffer+nWidth*nHeight;while (cinfo.next_scanline < cinfo.image_height){idx=0;for(i=0;i<nWidth;i++){ yuvbuf[idx++]=ybase[i + j * nWidth];yuvbuf[idx++]=ubase[j/2 * nWidth+(i/2)*2];yuvbuf[idx++]=ubase[j/2 * nWidth+(i/2)*2+1];} row_pointer[0] = yuvbuf;jpeg_write_scanlines(&cinfo, row_pointer, 1);j++;}free(yuvbuf);jpeg_finish_compress( &cinfo);jpeg_destroy_compress(&cinfo);fclose(pJpegFile);return 0;
}
int main(int argc, char *argv[]) {if (argc != 5) {fprintf(stderr, "Usage: %s <nv12_file> <jpeg_file> <width> <height>\n", argv[0]);return EXIT_FAILURE;}const char *nv12_file = argv[1];const char *jpeg_file = argv[2];int width = atoi(argv[3]);int height = atoi(argv[4]);// 读取 NV12 数据size_t nv12_size = width * height * 3 / 2;unsigned char *nv12_data = (unsigned char *)malloc(nv12_size);FILE *fp = fopen(nv12_file, "rb");fread(nv12_data, 1, nv12_size, fp);fclose(fp);clipNv12ToJpgFile(jpeg_file, nv12_data, width, height);free(nv12_data);return EXIT_SUCCESS;
}2 Makefile
CROSS_COMPILE:=mips-linux-uclibc-
TOPDIR ?= ./
CC = $(CROSS_COMPILE)gcc
CPP = $(CROSS_COMPILE)g++
STRIP = $(CROSS_COMPILE)strip
CXXFLAGS := -std=c++11 -mfp64 -mnan=2008 -mabs=2008 -Wall -EL -O3 -march=mips32r2 -flax-vector-conversions -lpthread -lrt -ldl -lm
INCLUDES := -I$(TOPDIR)/include
INCLUDES += -I$(TOPDIR)/libjpeg/incLIBS := -L$(TOPDIR)/libjpeg/ -ljpeg
TARGET = nv12_to_jpeg
OBJS := main.o
%.o:%.cpp$(CPP) $(INCLUDES) $(CXXFLAGS) -o $@ -c $^$(TARGET):$(OBJS)$(CPP) $(CXXFLAGS) $(OBJS) -o $@ $(INCLUDES) $(LIBS)all:$(TARGET).PHONY: clean
clean:rm -f $(TARGET) $(OBJS)