/* This is a simple MJPEG streaming webserver implemented for AI-Thinker ESP32-CAM and ESP-EYE modules. This is tested to work with VLC and Blynk video widget and can support up to 10 simultaneously connected streaming clients. Simultaneous streaming is implemented with dedicated FreeRTOS tasks. Inspired by and based on this Instructable: $9 RTSP Video Streamer Using the ESP32-CAM Board (https://www.instructables.com/id/9-RTSP-Video-Streamer-Using-the-ESP32-CAM-Board/) Board: AI-Thinker ESP32-CAM or ESP-EYE Compile as: ESP32 Dev Module CPU Freq: 240 Flash Freq: 80 Flash mode: QIO Flash Size: 4Mb Partrition: Minimal SPIFFS PSRAM: Enabled */ // ESP32 has two cores: APPlication core and PROcess core (the one that runs ESP32 SDK stack) #define APP_CPU 1 #define PRO_CPU 0 #include "esp_camera.h" #include "ov2640.h" #include #include #include #include #include #include #include // 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 #define MAX_CLIENTS 10 #include "camera_pins.h" /* Next one is an include with wifi credentials. This is what you need to do: 1. Create a file called "home_wifi_multi.h" in the same folder OR under a separate subfolder of the "libraries" folder of Arduino IDE. (You are creating a "fake" library really - I called it "MySettings"). 2. Place the following text in the file: #define SSID1 "replace with your wifi ssid" #define PWD1 "replace your wifi password" 3. Save. Should work then */ #include "home_wifi_multi.h" //OV2640 cam; WebServer server(80); // ===== rtos task handles ========================= // Streaming is implemented with 3 tasks: TaskHandle_t tMjpeg; // handles client connections to the webserver TaskHandle_t tCam; // handles getting picture frames from the camera and storing them locally uint8_t noActiveClients; // number of active clients // frameSync semaphore is used to prevent streaming buffer as it is replaced with the next frame SemaphoreHandle_t frameSync = NULL; // We will try to achieve FPS frame rate const int FPS = 10; // We will handle web client requests every 100 ms (10 Hz) const int WSINTERVAL = 100; // ======== Server Connection Handler Task ========================== void mjpegCB(void* pvParameters) { TickType_t xLastWakeTime; const TickType_t xFrequency = pdMS_TO_TICKS(WSINTERVAL); // Creating frame synchronization semaphore and initializing it frameSync = xSemaphoreCreateBinary(); xSemaphoreGive( frameSync ); //=== setup section ================== // Creating RTOS task for grabbing frames from the camera xTaskCreatePinnedToCore( camCB, // callback "cam", // name 4 * 1024, // stacj size NULL, // parameters 2, // priority &tCam, // RTOS task handle PRO_CPU); // core // Registering webserver handling routines server.on("/mjpeg/1", HTTP_GET, handleJPGSstream); server.onNotFound(handleNotFound); // Starting webserver server.begin(); noActiveClients = 0; Serial.printf("mjpegCB: free heap (start) : %d\n", ESP.getFreeHeap()); xLastWakeTime = xTaskGetTickCount(); // int ticker = 0; for (;;) { server.handleClient(); // After every server client handling request, we let other tasks run and then pause taskYIELD(); vTaskDelayUntil(&xLastWakeTime, xFrequency); // if ( (ticker++ % 10) == 0 ) Serial.printf("mjpegCB: main loop tick\n"); } } // Current frame information volatile uint32_t frameNumber; //volatile size_t camSize; // size of the current frame, byte //volatile char* camBuf; // pointer to the current frame struct frameChunck { uint8_t cnt; // served to clients counter. when equal to number of active clients, could be deleted uint32_t* nxt; // next chunck uint32_t fnm; // frame number uint32_t siz; // frame size uint8_t* dat; // frame pointer }; frameChunck* fstFrame; // first frame frameChunck* curFrame; // current frame being captured by the camera // ==== RTOS task to grab frames from the camera ========================= void camCB(void* pvParameters) { TickType_t xLastWakeTime; // A running interval associated with currently desired frame rate const TickType_t xFrequency = pdMS_TO_TICKS(1000 / FPS); frameNumber = 0; xLastWakeTime = xTaskGetTickCount(); for (;;) { camera_fb_t* fb = NULL; // Grab a frame from the camera and allocate frame chunk for it fb = esp_camera_fb_get(); frameChunck* f = (frameChunck*) ps_malloc( sizeof(frameChunck) ); if ( f ) { char* d = (char*) ps_malloc( fb->len ); if ( d == NULL ) { free (f); } else { if ( frameNumber == 0 ) { fstFrame = f; } f->dat = (uint8_t*) d; f->nxt = NULL; f->siz = fb->len; f->cnt = 0; memcpy(f->dat, (char *)fb->buf, fb->len); f->fnm = frameNumber; if ( curFrame ) { curFrame->nxt = (uint32_t*) f; } curFrame = f; // Serial.printf("Captured frame# %d\n", frameNumber); frameNumber++; } } esp_camera_fb_return(fb); taskYIELD(); vTaskDelayUntil(&xLastWakeTime, xFrequency); if ( noActiveClients == 0 ) { // we need to drain the cache if there are no more clients connected while ( fstFrame->nxt ) { frameChunck* f = (frameChunck*) fstFrame->nxt; free ( fstFrame->dat ); free ( fstFrame ); fstFrame = f; } Serial.printf("mjpegCB: free heap : %d\n", ESP.getFreeHeap()); Serial.printf("mjpegCB: min free heap) : %d\n", ESP.getMinFreeHeap()); Serial.printf("mjpegCB: max alloc free heap : %d\n", ESP.getMaxAllocHeap()); Serial.printf("mjpegCB: tCam stack wtrmark : %d\n", uxTaskGetStackHighWaterMark(tCam)); Serial.flush(); vTaskSuspend(NULL); // passing NULL means "suspend yourself" } } } // ==== STREAMING ====================================================== 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); struct streamInfo { WiFiClient *client; TaskHandle_t task; }; // ==== Handle connection request from clients =============================== void handleJPGSstream(void) { if ( noActiveClients >= MAX_CLIENTS ) return; Serial.printf("handleJPGSstream start: free heap : %d\n", ESP.getFreeHeap()); streamInfo* info = (streamInfo*) malloc( sizeof(streamInfo) ); info->client = new WiFiClient; *(info->client) = server.client(); // Creating task to push the stream to all connected clients int rc = xTaskCreatePinnedToCore( streamCB, "strmCB", 3 * 1024, (void*) info, 2, &info->task, APP_CPU); if ( rc != pdPASS ) { Serial.printf("handleJPGSstream: error creating RTOS task. rc = %d\n", rc); Serial.printf("handleJPGSstream: free heap : %d\n", ESP.getFreeHeap()); // Serial.printf("stk high wm: %d\n", uxTaskGetStackHighWaterMark(tSend)); delete info; } noActiveClients++; // Wake up streaming tasks, if they were previously suspended: if ( eTaskGetState( tCam ) == eSuspended ) vTaskResume( tCam ); } // ==== Actually stream content to all connected clients ======================== void streamCB(void * pvParameters) { char buf[16]; TickType_t xLastWakeTime; TickType_t xFrequency; frameChunck* myFrame = fstFrame; portMUX_TYPE xSemaphore = portMUX_INITIALIZER_UNLOCKED; streamInfo* info = (streamInfo*) pvParameters; if ( info == NULL ) { Serial.println("streamCB: a NULL pointer passed"); } // Immediately send this client a header info->client->write(HEADER, hdrLen); info->client->write(BOUNDARY, bdrLen); taskYIELD(); xLastWakeTime = xTaskGetTickCount(); xFrequency = pdMS_TO_TICKS(1000 / FPS); for (;;) { // Only bother to send anything if there is someone watching if ( info->client->connected() ) { if ( myFrame ) { info->client->write(CTNTTYPE, cntLen); sprintf(buf, "%d\r\n\r\n", fstFrame->siz); info->client->write(buf, strlen(buf)); info->client->write((char*) fstFrame->dat, (size_t)fstFrame->siz); info->client->write(BOUNDARY, bdrLen); info->client->flush(); // Serial.printf("Served frame# %d\n", fstFrame->fnm); if ( myFrame->nxt ) { frameChunck* f; f = (frameChunck*) myFrame->nxt; portENTER_CRITICAL(&xSemaphore); if ( ++myFrame->cnt == noActiveClients ) { assert(myFrame == fstFrame); free ( fstFrame->dat ); fstFrame->dat = NULL; free ( fstFrame ); fstFrame = f; } portEXIT_CRITICAL(&xSemaphore); myFrame = f; } } else { myFrame = fstFrame; } } else { // client disconnected - clean up. noActiveClients--; Serial.printf("streamCB: Stream Task stack wtrmark : %d\n", uxTaskGetStackHighWaterMark(info->task)); Serial.flush(); info->client->flush(); info->client->stop(); delete info->client; info->client = NULL; free( info ); info = NULL; vTaskDelete(NULL); } // Let other tasks run after serving every client taskYIELD(); vTaskDelayUntil(&xLastWakeTime, xFrequency); } } // ==== Handle invalid URL requests ============================================ 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); } // ==== SETUP method ================================================================== void setup() { // Setup Serial connection: Serial.begin(115200); delay(1000); // wait for a second to let Serial connect Serial.printf("setup: free heap : %d\n", ESP.getFreeHeap()); static camera_config_t camera_config = { .pin_pwdn = PWDN_GPIO_NUM, .pin_reset = RESET_GPIO_NUM, .pin_xclk = XCLK_GPIO_NUM, .pin_sscb_sda = SIOD_GPIO_NUM, .pin_sscb_scl = SIOC_GPIO_NUM, .pin_d7 = Y9_GPIO_NUM, .pin_d6 = Y8_GPIO_NUM, .pin_d5 = Y7_GPIO_NUM, .pin_d4 = Y6_GPIO_NUM, .pin_d3 = Y5_GPIO_NUM, .pin_d2 = Y4_GPIO_NUM, .pin_d1 = Y3_GPIO_NUM, .pin_d0 = Y2_GPIO_NUM, .pin_vsync = VSYNC_GPIO_NUM, .pin_href = HREF_GPIO_NUM, .pin_pclk = PCLK_GPIO_NUM, .xclk_freq_hz = 20000000, .ledc_timer = LEDC_TIMER_0, .ledc_channel = LEDC_CHANNEL_0, .pixel_format = PIXFORMAT_JPEG, /* FRAMESIZE_96X96, // 96x96 FRAMESIZE_QQVGA, // 160x120 FRAMESIZE_QCIF, // 176x144 FRAMESIZE_HQVGA, // 240x176 FRAMESIZE_240X240, // 240x240 FRAMESIZE_QVGA, // 320x240 FRAMESIZE_CIF, // 400x296 FRAMESIZE_HVGA, // 480x320 FRAMESIZE_VGA, // 640x480 FRAMESIZE_SVGA, // 800x600 FRAMESIZE_XGA, // 1024x768 FRAMESIZE_HD, // 1280x720 FRAMESIZE_SXGA, // 1280x1024 FRAMESIZE_UXGA, // 1600x1200 */ // .frame_size = FRAMESIZE_QVGA, // .frame_size = FRAMESIZE_UXGA, // .frame_size = FRAMESIZE_SVGA, // .frame_size = FRAMESIZE_VGA, .frame_size = FRAMESIZE_HD, // .frame_size = FRAMESIZE_UXGA, .jpeg_quality = 24, .fb_count = 2 }; #if defined(CAMERA_MODEL_ESP_EYE) pinMode(13, INPUT_PULLUP); pinMode(14, INPUT_PULLUP); #endif if (esp_camera_init(&camera_config) != ESP_OK) { Serial.println("Error initializing the camera"); delay(10000); ESP.restart(); } // Configure and connect to WiFi IPAddress ip; WiFi.mode(WIFI_STA); WiFi.begin(SSID1, PWD1); Serial.print("Connecting to WiFi"); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print(F(".")); } ip = WiFi.localIP(); Serial.println(F("WiFi connected")); Serial.println(""); Serial.print("\nStream Link: http://"); Serial.print(ip); Serial.println("/mjpeg/1\n\n"); // Start mainstreaming RTOS task xTaskCreatePinnedToCore( mjpegCB, "mjpeg", 3 * 1024, NULL, 2, &tMjpeg, APP_CPU); Serial.printf("setup complete: free heap : %d\n", ESP.getFreeHeap()); } void loop() { vTaskDelay(1000); }