Method _captureHandler

examples/WebCamServer/ESP32WebCam.cpp:262–290

* Capturing a still image from the image sensor and transferring it via HTTP * content. This function is an internal, static entry and URI handler. * If the format of the current sensor is other than JPEG, the response code * 200 will be sent along with a simple text message. * Also, if the capture of the image frame fails, a 500 response will be * returned to the client. * @param req

 * @return ESP_FAIL
 */
esp_err_t ESP32WebCam::_captureHandler(httpd_req_t* req) {
  esp_err_t rc;

  camera_fb_t*  fb = esp_camera_fb_get();
  if (fb) {
    if (fb->format == PIXFORMAT_JPEG) {
      // Specifies it can be displayed inside the Web page.
      httpd_resp_set_hdr(req, ESP32WebCam::_CONTENT_DISPOSITION, "inline");
      rc = _sendResponse(req, 200, "image/jpeg", reinterpret_cast<const char*>(fb->buf), fb->len);
    }
    else {
      // Respond with JPEG converted buffer.
      httpd_resp_set_status(req, HTTPD_200);
      httpd_resp_set_type(req, "image/jpeg");
      httpd_resp_set_hdr(req, ESP32WebCam::_CONTENT_DISPOSITION, "inline");
      httpd_resp_set_hdr(req, ESP32WebCam::_ACCESS_CONTROL_ALLOW_ORIGIN, "*");

      _jpgChunking_t  jChunk = {req, 0};
      rc = frame2jpg_cb(fb, 80, _jpgEncodeStream, &jChunk) ? ESP_OK : ESP_FAIL;
      httpd_resp_send_chunk(req, NULL, 0);
    }
    esp_camera_fb_return(fb);
  }
  else {
    _sendResponse(req, HTTPD_500_INTERNAL_SERVER_ERROR, "text/plain", "failed to esp_camera_fb_get");
    rc = ESP_FAIL;
  }
  return rc;
}

/**
 * Request handler that prompts ESP32Cam function execution by an HTTP request.