二维码解码器-Quirc使用教程

一.描述

        quirc是一款专用于识别二维码（不能识别一维码）的开源软件。它比zbar轻量一些，跟zbar一样能扫描码流和静态图片识别条形码，

        库文件总共6个文件，非常的小，编译之后的静态库只有25kb。官方代码是依赖libjpg库和linpng库进行解码转换成灰度后再进行二维码检测的。本次仅仅传入灰度图片进行解码，将不依赖jpeg和png进行二维码检测功能

二.使用样例

#include 
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#include 
#include 
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#include    
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#include 
#include 
static void rgb888tomonochrome(uint8_t *rgb_data, int width, int height, uint8_t *dst)
{
    int i, j;
    for (i = 0; i < height; i++)
    {
        for (j = 0; j < width; j++)
        {
            unsigned char *pixel = rgb_data + (i * width + j) * 3;
            unsigned char r = pixel[0];
            unsigned char g = pixel[1];
            unsigned char b = pixel[2];
 
             *(dst++) = (r + g + b) / 3;
        }
    }
}
 
int main(int argc, char **argv)
{
    /*读rgb数据*/
    if (argc != 4)
    {
        printf("failed:argc=%d\n", argc);
        return 0;
    }
    /*读取文件*/
    int image_width = atoi(argv[1]);
    int image_hight = atoi(argv[2]);
    const int iamge_size = image_width * image_hight * 3;
    uint8_t *image_buffer = (uint8_t *)malloc(iamge_size);
    if (image_buffer == NULL)
    {
        printf("malloc failed \n");
        return 0;
    }
    int fd = open(argv[3], O_RDONLY);
    read(fd, image_buffer, iamge_size);
    close(fd);
 
    /*创建解码器*/
    struct quirc *qr_coder = quirc_new();
    if (qr_coder == NULL)
    {
        printf("create quirc new failed \n");
        return -1;
    }
 
    /*设置解码的分辨率*/
    if (quirc_resize(qr_coder, image_width, image_hight) < 0)
    {
        printf("quirce size failed \n");
        goto finish;
    }
 
    uint8_t *image_mono_buf = quirc_begin(qr_coder, NULL, NULL);
 
    rgb888tomonochrome(image_buffer, image_width, image_hight, image_mono_buf);
 
 
    quirc_end(qr_coder);
    int qr_count = quirc_count(qr_coder);
    printf("find qrcode count:%d\n", qr_count);
    for (int i = 0; i < qr_count; i++)
    {
        struct quirc_code code;
        struct quirc_data data;
        quirc_extract(qr_coder, i, &code);
        quirc_decode_error_t err = quirc_decode(&code, &data);
 
        if (err == QUIRC_ERROR_DATA_ECC)
        {
            quirc_flip(&code);
            err = quirc_decode(&code, &data);
        }
 
        if (!err)
        {
            printf("%s\n", data.payload);
        }
    }
    quirc_destroy(qr_coder);
finish:
    if (image_buffer)
    {
        free(image_buffer);
    }
    return -1;
}