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对于 HTTP 或任何 Web 服务器代码,我完全没有经验。我正在尝试使用 ESP32 在 Web 服务器上流式传输我的 MLX90640 视频。目前,我将 MLX90640 连接到 ESP32,并且可以在串行监视器中重复打印像素以显示 ASCII 视频。我现在正在努力从这个开始,到在我的网络服务器上观看视频。

我的 MLX90640 被输出到一个 32x24 的浮点数组中。然后我将其映射到 0-255 并将其用作 16 位相机颜色数组的输入。我想我在尝试将 uint16_t 转换为描述 jpeg 帧所需的任何类型的数据时遇到问题。

当我在 Chrome 上启动我的服务器时,我目前看到一个全黑屏幕,屏幕中央有一个小白框。下面,我已将所有相关功能附加到项目的这一部分,但我会监控并在需要时发布我的其余代码!

我读过很多类似的项目,但大多数都使用不同的相机类型,而且我无法复制 MLX90640 所需的功能。任何有关下一步尝试或阅读的建议将不胜感激!

提前致谢。

float frame[32*24]; // buffer for full frame of temperatures

float MinTemp;
float MaxTemp;

const char HEADER[] = "HTTP/1.1 200 OK\r\n" \
                      "Access-Control-Allow-Origin: *\r\n" \
                      "Content-Type: multipart/x-mixed-replace; boundary=123456789000000000000987654321\r\n";
const char BOUNDARY[] = "\r\n--123456789000000000000987654321\r\n";
const char CTNTTYPE[] = "Content-Type: image/jpeg\r\nContent-Length: ";
const int hdrLen = strlen(HEADER);
const int bdrLen = strlen(BOUNDARY);
const int cntLen = strlen(CTNTTYPE);

const uint16_t camColors[] = {0x480F,
                              0x400F, 0x400F, 0x400F, 0x4010, 0x3810, 0x3810, 0x3810, 0x3810, 0x3010, 0x3010,
                              0x3010, 0x2810, 0x2810, 0x2810, 0x2810, 0x2010, 0x2010, 0x2010, 0x1810, 0x1810,
                              0x1811, 0x1811, 0x1011, 0x1011, 0x1011, 0x0811, 0x0811, 0x0811, 0x0011, 0x0011,
                              0x0011, 0x0011, 0x0011, 0x0031, 0x0031, 0x0051, 0x0072, 0x0072, 0x0092, 0x00B2,
                              0x00B2, 0x00D2, 0x00F2, 0x00F2, 0x0112, 0x0132, 0x0152, 0x0152, 0x0172, 0x0192,
                              0x0192, 0x01B2, 0x01D2, 0x01F3, 0x01F3, 0x0213, 0x0233, 0x0253, 0x0253, 0x0273,
                              0x0293, 0x02B3, 0x02D3, 0x02D3, 0x02F3, 0x0313, 0x0333, 0x0333, 0x0353, 0x0373,
                              0x0394, 0x03B4, 0x03D4, 0x03D4, 0x03F4, 0x0414, 0x0434, 0x0454, 0x0474, 0x0474,
                              0x0494, 0x04B4, 0x04D4, 0x04F4, 0x0514, 0x0534, 0x0534, 0x0554, 0x0554, 0x0574,
                              0x0574, 0x0573, 0x0573, 0x0573, 0x0572, 0x0572, 0x0572, 0x0571, 0x0591, 0x0591,
                              0x0590, 0x0590, 0x058F, 0x058F, 0x058F, 0x058E, 0x05AE, 0x05AE, 0x05AD, 0x05AD,
                              0x05AD, 0x05AC, 0x05AC, 0x05AB, 0x05CB, 0x05CB, 0x05CA, 0x05CA, 0x05CA, 0x05C9,
                              0x05C9, 0x05C8, 0x05E8, 0x05E8, 0x05E7, 0x05E7, 0x05E6, 0x05E6, 0x05E6, 0x05E5,
                              0x05E5, 0x0604, 0x0604, 0x0604, 0x0603, 0x0603, 0x0602, 0x0602, 0x0601, 0x0621,
                              0x0621, 0x0620, 0x0620, 0x0620, 0x0620, 0x0E20, 0x0E20, 0x0E40, 0x1640, 0x1640,
                              0x1E40, 0x1E40, 0x2640, 0x2640, 0x2E40, 0x2E60, 0x3660, 0x3660, 0x3E60, 0x3E60,
                              0x3E60, 0x4660, 0x4660, 0x4E60, 0x4E80, 0x5680, 0x5680, 0x5E80, 0x5E80, 0x6680,
                              0x6680, 0x6E80, 0x6EA0, 0x76A0, 0x76A0, 0x7EA0, 0x7EA0, 0x86A0, 0x86A0, 0x8EA0,
                              0x8EC0, 0x96C0, 0x96C0, 0x9EC0, 0x9EC0, 0xA6C0, 0xAEC0, 0xAEC0, 0xB6E0, 0xB6E0,
                              0xBEE0, 0xBEE0, 0xC6E0, 0xC6E0, 0xCEE0, 0xCEE0, 0xD6E0, 0xD700, 0xDF00, 0xDEE0,
                              0xDEC0, 0xDEA0, 0xDE80, 0xDE80, 0xE660, 0xE640, 0xE620, 0xE600, 0xE5E0, 0xE5C0,
                              0xE5A0, 0xE580, 0xE560, 0xE540, 0xE520, 0xE500, 0xE4E0, 0xE4C0, 0xE4A0, 0xE480,
                              0xE460, 0xEC40, 0xEC20, 0xEC00, 0xEBE0, 0xEBC0, 0xEBA0, 0xEB80, 0xEB60, 0xEB40,
                              0xEB20, 0xEB00, 0xEAE0, 0xEAC0, 0xEAA0, 0xEA80, 0xEA60, 0xEA40, 0xF220, 0xF200,
                              0xF1E0, 0xF1C0, 0xF1A0, 0xF180, 0xF160, 0xF140, 0xF100, 0xF0E0, 0xF0C0, 0xF0A0,
                              0xF080, 0xF060, 0xF040, 0xF020, 0xF800,
                             };

uint16_t colorFrame(float color){
   uint8_t colorIndex = map(color, MinTemp-5.0, MaxTemp+5.0, 0, 255);
   colorIndex = constrain(colorIndex, 0, 255);

   return camColors[colorIndex];
}

void setMinMaxTemps(){
    MaxTemp = frame[0];            // Get first data to find Max and Min Temperature
    MinTemp = frame[0];
    
    for (int x = 0 ; x < 768 ; x++)     // Find Maximum and Minimum Temperature
    {
      MaxTemp = max(MaxTemp, frame[x]);
      MinTemp = min(MinTemp, frame[x]);
    }
}

void handle_videostream(){  

  WiFiClient client = server.client();
  client.write(HEADER, hdrLen);
  client.write(BOUNDARY, bdrLen);
 
  uint16_t frameColor[768];
  char buf[32];

  while (1)
  {
    if (!client.connected())
      break;

    Serial.println("Get the MLX frame!");
    if (mlx.getFrame(frame) != 0) {
      Serial.println("Failed to get the frame..");
    }
          
    setMinMaxTemps();
    for(int i=0; i<768; i++){
      frameColor[i] = colorFrame(frame[i]);
    }
    
    client.write(CTNTTYPE, cntLen);
    sprintf( buf, "%d\r\n\r\n", 768*4 );
    client.write(buf, strlen(buf));
    Serial.println(buf);
    
    client.write((char *)frameColor, 768*4);
    client.write(BOUNDARY, bdrLen);
    if (!client.connected())
      break;
  }
}
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