Can someone explain this code to me line by line? I would like to understand so I can come up with my own code. TITLE:

[answerhappygod]

Can someone explain this code to me line by line? Iwould like to understand so I can come up with my own code.TITLE: HOW TO BUILD A RSTP VIDEO STREAMER: Using The ESP-32CAM Board || Arduino IDE - DIY #14 *DESCRIPTION: This sketch creates a video streamer than uses RTSP.You can configure it to either connect to an existing WiFi networkor to create * a new access point that you can connect to, in orderto stream the video feed.Board Settings:* Board: "ESP32 Wrover Module"* Upload Speed: "921600"* Flash Frequency: "80MHz" * Flash Mode: "QIO"* Partition Scheme: "Hue APP (3MB No OTA/1MB SPIFFS)"* Core Debug Level: "None"* COM Port: "Depends On Your System"#include "src/OV2640.h"#include <WiFi.h>#include <WebServer.h>#include <WiFiClient.h>
#include "src/SimStreamer.h"#include "src/OV2640Streamer.h"#include "src/CRtspSession.h"
//#define ENABLE_OLED //if want use oled ,turn on thimacro//#define SOFTAP_MODE // If you want to run our own softap turnthis on//#define ENABLE_WEBSERVER#define ENABLE_RTSPSERVER
#ifdef ENABLE_OLED#include "SSD1306.h"#define OLED_ADDRESS 0x3c#define I2C_SDA 14#define I2C_SCL 13SSD1306Wire display(OLED_ADDRESS, I2C_SDA, I2C_SCL,GEOMETRY_128_32);bool hasDisplay; // we probe for the device at runtime#endif
// Select camera model//#define CAMERA_MODEL_WROVER_KIT//#define CAMERA_MODEL_ESP_EYE//#define CAMERA_MODEL_M5STACK_PSRAM//#define CAMERA_MODEL_M5STACK_WIDE#define CAMERA_MODEL_AI_THINKER
#include "camera_pins.h"
OV2640 cam;
#ifdef ENABLE_WEBSERVERWebServer server(80);#endif
#ifdef ENABLE_RTSPSERVERWiFiServer rtspServer(8554);#endif
#ifdef SOFTAP_MODEIPAddress apIP = IPAddress(192, 168, 1, 1);#else#include "wifikeys.h"#endif
#ifdef ENABLE_WEBSERVERvoid handle_jpg_stream(void){ WiFiClient client = server.client(); String response = "HTTP/1.1 200 OK\r\n"; response += "Content-Type: multipart/x-mixed-replace;boundary=frame\r\n\r\n"; server.sendContent(response);
while (1) { cam.run(); if (!client.connected()) break; response = "--frame\r\n"; response += "Content-Type:image/jpeg\r\n\r\n"; server.sendContent(response);
client.write((char*)cam.getfb(), cam.getSize()); server.sendContent("\r\n"); if (!client.connected()) break; }}
void handle_jpg(void){ WiFiClient client = server.client();
cam.run(); if (!client.connected()) { return; } String response = "HTTP/1.1 200 OK\r\n"; response += "Content-disposition: inline;filename=capture.jpg\r\n"; response += "Content-type: image/jpeg\r\n\r\n"; server.sendContent(response); client.write((char *)cam.getfb(),cam.getSize());}
void handleNotFound(){ String message = "Server is running!\n\n"; message += "URI: "; message += server.uri(); message += "\nMethod: "; message += (server.method() == HTTP_GET) ? "GET" :"POST"; message += "\nArguments: "; message += server.args(); message += "\n"; server.send(200, "text/plain", message);}#endif
void lcdMessage(String msg){ #ifdef ENABLE_OLED if(hasDisplay) { display.clear(); display.drawString(128 / 2, 32 / 2,msg); display.display(); } #endif}
void setup(){ #ifdef ENABLE_OLED hasDisplay = display.init(); if(hasDisplay) { display.flipScreenVertically(); display.setFont(ArialMT_Plain_16); display.setTextAlignment(TEXT_ALIGN_CENTER); } #endif lcdMessage("booting");
Serial.begin(115200); //while (!Serial); //wait for serial connection.
camera_config_t config; config.ledc_channel = LEDC_CHANNEL_0; config.ledc_timer = LEDC_TIMER_0; config.pin_d0 = Y2_GPIO_NUM; config.pin_d1 = Y3_GPIO_NUM; config.pin_d2 = Y4_GPIO_NUM; config.pin_d3 = Y5_GPIO_NUM; config.pin_d4 = Y6_GPIO_NUM; config.pin_d5 = Y7_GPIO_NUM; config.pin_d6 = Y8_GPIO_NUM; config.pin_d7 = Y9_GPIO_NUM; config.pin_xclk = XCLK_GPIO_NUM; config.pin_pclk = PCLK_GPIO_NUM; config.pin_vsync = VSYNC_GPIO_NUM; config.pin_href = HREF_GPIO_NUM; config.pin_sscb_sda = SIOD_GPIO_NUM; config.pin_sscb_scl = SIOC_GPIO_NUM; config.pin_pwdn = PWDN_GPIO_NUM; config.pin_reset = RESET_GPIO_NUM; config.xclk_freq_hz = 20000000; config.pixel_format = PIXFORMAT_JPEG; config.frame_size = FRAMESIZE_SVGA; config.jpeg_quality = 12; config.fb_count = 2; #if defined(CAMERA_MODEL_ESP_EYE) pinMode(13, INPUT_PULLUP); pinMode(14, INPUT_PULLUP); #endif cam.init(config); IPAddress ip;
#ifdef SOFTAP_MODE const char *hostname = "devcam"; // WiFi.hostname(hostname); // FIXME - find out whyundefined lcdMessage("starting softAP"); WiFi.mode(WIFI_AP); bool result = WiFi.softAP(hostname, "12345678", 1,0); delay(2000); WiFi.softAPConfig(apIP, apIP, IPAddress(255, 255,255, 0)); if (!result) { Serial.println("AP Configfailed."); return; } else { Serial.println("AP ConfigSuccess."); Serial.print("AP MAC: "); Serial.println(WiFi.softAPmacAddress());
ip = WiFi.softAPIP();
Serial.print("Stream Link:rtsp://"); Serial.print(ip); Serial.println(":8554/mjpeg/1"); }#else lcdMessage(String("join ") + ssid); WiFi.mode(WIFI_STA); WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print(F(".")); } ip = WiFi.localIP(); Serial.println(F("WiFi connected")); Serial.println(""); Serial.println(ip); Serial.print("Stream Link: rtsp://"); Serial.print(ip); Serial.println(":8554/mjpeg/1");#endif
lcdMessage(ip.toString());
#ifdef ENABLE_WEBSERVER server.on("/", HTTP_GET, handle_jpg_stream); server.on("/jpg", HTTP_GET, handle_jpg); server.onNotFound(handleNotFound); server.begin();#endif
#ifdef ENABLE_RTSPSERVER rtspServer.begin();#endif}
CStreamer *streamer;CRtspSession *session;WiFiClient client; // FIXME, support multiple clients
void loop(){#ifdef ENABLE_WEBSERVER server.handleClient();#endif
#ifdef ENABLE_RTSPSERVER uint32_t msecPerFrame = 100; static uint32_t lastimage = millis();
// If we have an active client connection,just service that until gone // (FIXME - support multiple simultaneousclients) if(session) { session->handleRequests(0); // wedon't use a timeout here, // instead we send only if we have newenough frames
uint32_t now = millis(); if(now > lastimage + msecPerFrame ||now < lastimage) { // handle clock rollover session->broadcastCurrentFrame(now); lastimage = now;
// check if we areoverrunning our max frame rate now = millis(); if(now > lastimage +msecPerFrame) printf("warning exceeding max frame rate of %d ms\n", now -lastimage); }
if(session->m_stopped) { delete session; delete streamer; session = NULL; streamer = NULL; } } else { client = rtspServer.accept();
if(client) { //streamer = newSimStreamer(&client, true); // our streamer for UDP/TCP based RTP transport streamer = newOV2640Streamer(&client, cam); // our streamer for UDP/TCP based RTPtransport
session = newCRtspSession(&client, streamer); // our threads RTSP sessionand state } }#endif}