嘿,对这个新手问题感到抱歉,但是我认为我只是缺少一些明显的东西...对于一些指导,我将非常满意:



esp_camera.h的内联文档:

/**
 * @brief Data structure of camera frame buffer
 */
typedef struct {
    uint8_t * buf;              /*!< Pointer to the pixel data */
    size_t len;                 /*!< Length of the buffer in bytes */
    size_t width;               /*!< Width of the buffer in pixels */
    size_t height;              /*!< Height of the buffer in pixels */
    pixformat_t format;         /*!< Format of the pixel data */
} camera_fb_t;


加上演示代码的摘录:
从esp32代码:

    //replace this with your own function
    display_image(fb->width, fb->height, fb->pixformat, fb->buf, fb->len);


代码获取帧缓冲区

    camera_fb_t * fb = NULL;
    esp_err_t res = ESP_OK;

    fb = esp_camera_fb_get(); // framebuffer in grayscale




并将fb缓冲区送入imagebuffer

    int w, h;
    int i, count;
    uint8_t *imagebuffer = quirc_begin(qr, &w, &h);

    //Feed 'fb' into 'imagebuffer' somehow?
    //-------------------------------
    // ----- DUMMY CODE?! not the proper way? ----
    imagebuffer = fb->buf; //fb's own buf field, holding the pixel data

    //Comment from quirc below:
    /* Fill out the image buffer here.
     * 'imagebuffer' is a pointer to a w*h bytes.
     * One byte per pixel, w pixels per line, h lines in the buffer.
     */
    //
    quirc_end(qr);


quirc的内联注释文档:

    /* These functions are used to process images for QR-code recognition.
     * quirc_begin() must first be called to obtain access to a buffer into
     * which the input image should be placed. Optionally, the current
     * width and height may be returned.
     *
     * After filling the buffer, quirc_end() should be called to process
     * the image for QR-code recognition. The locations and content of each
     * code may be obtained using accessor functions described below.
     */
    uint8_t *quirc_begin(struct quirc *q, int *w, int *h);
    void quirc_end(struct quirc *q);


https://github.com/dlbeer/quirc



我浏览了代码,源文件等,但是由于我是新手,所以不知道如何将二者合并或馈入。



有人可以在这里指出我正确的方向吗?遍历代码堆并不脏,但是我对C的经验不足是这里的问题:S谢谢!

最佳答案

图书馆的作者很友好地解释了它,
在此处发布代码答案,因为它可能对其他人有帮助:

  int w, h;
  int i, count;
  uint8_t *buff = quirc_begin(qr, &w, &h);
  //
  int total_pixels = w * h;

  for (int i = 0; i < total_pixels; i++) {
    // grab a pixel from your source image at element i
    // convert it somehow, then store it
    buff[i] = fb->buf[i]; //?
  }
  //
  quirc_end(qr);

  count = quirc_count(qr);
  Serial.println("count found codes:");
  Serial.println(count);


github issue with lib author's explaination

关于c - 如何合并/供给两个uint8_t缓冲区?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/59885037/

10-11 23:07
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