esp32-cam: Max image size to be base64 encoded and sended

[FromJapan]

I,
I'm trying to capture images with esp32-cam, then transform the images into a base64 string, which will be sent to google drive.
The maximum size of images I can send to the drive is approximately 45kb. For larger images only a part is sended.
Seems to be a memory issue with esp32 but shouldn't it be possible to send larger images?
The code I'm using is:

Code: [Select all] [Expand/Collapse]

1.  
2. #include <WiFi.h>
3. #include <WiFiClientSecure.h>
4. #include "soc/soc.h"
5. #include "soc/rtc_cntl_reg.h"
6. #include "esp_camera.h"
7. #include "Base64.h"
8.  
9. const char* ssid     = "";  
10. const char* password = "";
11. const char* host = "script.google.com";
12. String meuScript = "/macros/s/.../exec";
13.  
14. String nomedoArquivo = "filename=ESP32-CAM.jpg";
15. String mimeType = "&mimetype=image/jpeg";
16. String Imagem = "&data=";
17.  
18. int tempo_espera = 10000;  
19.  
20. //Definição dos pinos
21. #define PWDN_GPIO_NUM     32
22. #define RESET_GPIO_NUM    -1
23. #define XCLK_GPIO_NUM      0
24. #define SIOD_GPIO_NUM     26
25. #define SIOC_GPIO_NUM     27
26. #define Y9_GPIO_NUM       35
27. #define Y8_GPIO_NUM       34
28. #define Y7_GPIO_NUM       39
29. #define Y6_GPIO_NUM       36
30. #define Y5_GPIO_NUM       21
31. #define Y4_GPIO_NUM       19
32. #define Y3_GPIO_NUM       18
33. #define Y2_GPIO_NUM        5
34. #define VSYNC_GPIO_NUM    25
35. #define HREF_GPIO_NUM     23
36. #define PCLK_GPIO_NUM     22
37. #define flash 4
38.  
39. void setup()
40. {
41.    
42.   WRITE_PERI_REG(RTC_CNTL_BROWN_OUT_REG, 0);
43.    
44.   Serial.begin(115200);
45.   delay(100);
46.    
47.   WiFi.mode(WIFI_STA);
48.  
49.   Serial.println("");
50.   Serial.print("Conectando na rede: ");
51.   Serial.println(ssid);
52.   WiFi.begin(ssid, password);  
53.  
54.   while (WiFi.status() != WL_CONNECTED) {  
55.     Serial.print(".");
56.     delay(500);
57.   }
58.  
59.   pinMode(flash,OUTPUT);
60.  
61.   Serial.println("Conectado!");
62.   Serial.println();
63.   Serial.print("endereço STAIP: ");
64.   Serial.println(WiFi.localIP());
65.   Serial.println();
66.  
67.   camera_config_t config;
68.   config.ledc_channel = LEDC_CHANNEL_0;
69.   config.ledc_timer = LEDC_TIMER_0;
70.   config.pin_d0 = Y2_GPIO_NUM;
71.   config.pin_d1 = Y3_GPIO_NUM;
72.   config.pin_d2 = Y4_GPIO_NUM;
73.   config.pin_d3 = Y5_GPIO_NUM;
74.   config.pin_d4 = Y6_GPIO_NUM;
75.   config.pin_d5 = Y7_GPIO_NUM;
76.   config.pin_d6 = Y8_GPIO_NUM;
77.   config.pin_d7 = Y9_GPIO_NUM;
78.   config.pin_xclk = XCLK_GPIO_NUM;
79.   config.pin_pclk = PCLK_GPIO_NUM;
80.   config.pin_vsync = VSYNC_GPIO_NUM;
81.   config.pin_href = HREF_GPIO_NUM;
82.   config.pin_sscb_sda = SIOD_GPIO_NUM;
83.   config.pin_sscb_scl = SIOC_GPIO_NUM;
84.   config.pin_pwdn = PWDN_GPIO_NUM;
85.   config.pin_reset = RESET_GPIO_NUM;
86.   config.xclk_freq_hz = 20000000;
87.   config.pixel_format = PIXFORMAT_JPEG;
88.  
89.   // if PSRAM IC present, init with UXGA resolution and higher JPEG quality
90.   //                      for larger pre-allocated frame buffer.
91.   if(psramFound()){
92.     Serial.print("FOUND");
93.     config.frame_size = FRAMESIZE_UXGA; // FRAMESIZE_ + QVGA|CIF|VGA|SVGA|XGA|SXGA|UXGA
94.     config.jpeg_quality = 50;
95.     config.fb_count = 2;
96.   } else {
97.     Serial.print("not found");
98.     config.frame_size = FRAMESIZE_SVGA;
99.     config.jpeg_quality = 12;
100.     config.fb_count = 1;
101.    }
102.    
103.   esp_err_t err = esp_camera_init(&config); //Inicialização da câmera
104.    
105.   if (err != ESP_OK) {
106.      
107.     Serial.printf("O início da câmera falhou com erro 0x%x", err);
108.     delay(1000);
109.     ESP.restart();//Reinicia o ESP
110.      
111.   }
112.    
113. }
114.  
115. void loop() {
116.    
117.   Captura_Imagem();
118.   delay(4000);
119.    
120. }
121.  
122. void Captura_Imagem() {
123.    
124.   Serial.println("Conectando ao " + String(host));
125.  
126.   WiFiClientSecure client;
127.   client.setInsecure();
128.    
129.   if (client.connect(host, 443)) {
130.      
131.     Serial.println("Conexão com sucesso!");
132.      
133.     camera_fb_t * fb = NULL;
134.      
135.     digitalWrite(flash,HIGH);
136.     delay(100);
137.      
138.     fb = esp_camera_fb_get();
139.      
140.     digitalWrite(flash,LOW);
141.     delay(100);
142.      
143.     if(!fb) {
144.        
145.       Serial.println("Falha ao capturar imagem!");
146.       delay(1000);
147.       ESP.restart();
148.       return;
149.      
150.     }
151.  
152.    
153.     char *input = (char *)fb->buf;
154.     char output[base64_enc_len(3)];
155.     String imageFile = "";
156.  
157.     for (int i=0;i<fb->len;i++) {
158.       base64_encode(output, (input++), 3);
159.       if (i%3==0) imageFile += urlencode(String(output));
160.     }
161.    
162.     String Data = nomedoArquivo+mimeType+Imagem;
163.      
164.     esp_camera_fb_return(fb);
165.      
166.     Serial.println("Enviando imagem capturada ao Google Drive.");
167.    
168.     client.println("POST " + meuScript + " HTTP/1.1");
169.     client.println("Host: " + String(host));
170.     client.println("Content-Length: " + String(Data.length()+imageFile.length()));
171.     client.println("Content-Type: application/x-www-form-urlencoded");
172.     client.println();
173.      
174.     client.print(Data);
175.  
176.     int Index;
177.     Serial.print("START:\n");
178.     for (Index = 0; Index < imageFile.length(); Index = Index+1000) {
179.       client.print(imageFile.substring(Index, Index+1000));
180.  
181.     }
182.    
183.    
184.     Serial.print("END:\n");
185.      
186.     Serial.println("Aguardando resposta.");
187.      
188.     long int tempo_inicio = millis();
189.      
190.     while (!client.available()) {
191.       Serial.print(".");
192.       delay(100);
193.       if ((tempo_inicio+tempo_espera) < millis()) {
194.         Serial.println();
195.         Serial.println("Sem Resposta.");
196.         break;
197.       }
198.     }
199.      
200.     Serial.println();  
201.      
202.     while (client.available()) {
203.       Serial.print(char(client.read()));
204.     }  
205.   } else {        
206.     Serial.println("Conexão ao " + String(host) + " falhada.");
207.   }
208.   client.stop();
209. }
210.  
211.  
212. String urlencode(String str)
213. {
214.     String encodedString="";
215.     char c;
216.     char code0;
217.     char code1;
218.     char code2;
219.      
220.     for (int i =0; i < str.length(); i++){
221.       c=str.charAt(i);
222.       if (c == ' '){
223.         encodedString+= '+';
224.       } else if (isalnum(c)){
225.         encodedString+=c;
226.       } else{
227.         code1=(c & 0xf)+'0';
228.         if ((c & 0xf) >9){
229.             code1=(c & 0xf) - 10 + 'A';
230.         }
231.         c=(c>>4)&0xf;
232.         code0=c+'0';
233.         if (c > 9){
234.             code0=c - 10 + 'A';
235.         }
236.         code2='\0';
237.         encodedString+='%';
238.         encodedString+=code0;
239.         encodedString+=code1;
240.       }
241.       yield();
242.     }
243.     return encodedString;
244. }
245.  
246.  

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[Bomexx]

Have you found a solution yet?

[aparnareddy]

Hi does this issue got resolved
if yes , can you please share the code.

thank you
aparna