Add framerate limit, print delay in debug dump.

Add global variable and #define in config to set default. Add new parameter in /control handler and preferences.
easytarget · Dec 16, 2021 · 158575a · 158575a
1 parent ae37979
commit 158575a
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Showing 4 changed files with 21 additions and 3 deletions.
diff --git a/app_httpd.cpp b/app_httpd.cpp
@@ -52,6 +52,7 @@ extern int8_t streamCount;
 extern unsigned long streamsServed;
 extern unsigned long imagesServed;
 extern int myRotation;
+extern int framerateLimit;
 extern int lampVal;
 extern bool autoLamp;
 extern bool filesystem;
@@ -274,13 +275,16 @@ static esp_err_t stream_handler(httpd_req_t *req){
             break;
         }
         int64_t frame_time = esp_timer_get_time() - last_frame;
-        last_frame = esp_timer_get_time();;
         frame_time /= 1000;
+        int32_t frame_delay = (framerateLimit > frame_time) ? framerateLimit - frame_time : 0;
+        delay(frame_delay);
+
         if (debugData) {
-            Serial.printf("MJPG: %uB %ums (%.1ffps)\r\n",
+            Serial.printf("MJPG: %uB %ums, delay: %ums, framerate (%.1ffps)\r\n",
                 (uint32_t)(_jpg_buf_len),
-                (uint32_t)frame_time, 1000.0 / (uint32_t)frame_time);
+                (uint32_t)frame_time, frame_delay, 1000.0 / (uint32_t)(frame_time + frame_delay));
         }
+        last_frame = esp_timer_get_time();
     }
 
     streamsServed++;
@@ -355,6 +359,7 @@ static esp_err_t cmd_handler(httpd_req_t *req){
     else if(!strcmp(variable, "wb_mode")) res = s->set_wb_mode(s, val);
     else if(!strcmp(variable, "ae_level")) res = s->set_ae_level(s, val);
     else if(!strcmp(variable, "rotate")) myRotation = val;
+    else if(!strcmp(variable, "framerate_limit")) framerateLimit = val;
     else if(!strcmp(variable, "autolamp") && (lampVal != -1)) {
         autoLamp = val;
         if (autoLamp) {
@@ -410,6 +415,7 @@ static esp_err_t status_handler(httpd_req_t *req){
     *p++ = '{';
     p+=sprintf(p, "\"lamp\":%d,", lampVal);
     p+=sprintf(p, "\"autolamp\":%d,", autoLamp);
+    p+=sprintf(p, "\"framerate_limit\":%d,", framerateLimit);
     p+=sprintf(p, "\"framesize\":%u,", s->status.framesize);
     p+=sprintf(p, "\"quality\":%u,", s->status.quality);
     p+=sprintf(p, "\"brightness\":%d,", s->status.brightness);

diff --git a/esp32-cam-webserver.ino b/esp32-cam-webserver.ino
@@ -147,6 +147,12 @@ char myVer[] PROGMEM = __DATE__ " @ " __TIME__;
 #endif
 int myRotation = CAM_ROTATION;
 
+// minimal frame duration in ms, effectively 1/maxFPS
+#if !defined(FRAMERATE_LIMIT)
+    #define FRAMERATE_LIMIT 0
+#endif
+int framerateLimit = FRAMERATE_LIMIT;
+
 // Illumination LAMP and status LED
 #if defined(LAMP_DISABLE)
     int lampVal = -1; // lamp is disabled in config

diff --git a/myconfig.sample.h b/myconfig.sample.h
@@ -143,6 +143,9 @@ struct station stationList[] = {{"ssid1", "pass1", true},
 // Browser Rotation (one of: -90,0,90, default 0)
 // #define CAM_ROTATION 0
 
+// Minimal frame duration in ms, used to limit max FPS
+// max_fps = 1000/framerate_limit
+// #define FRAMERATE_LIMIT 500
 
 /*
  * Additional Features

diff --git a/storage.cpp b/storage.cpp
@@ -7,6 +7,7 @@ extern void flashLED(int flashtime);
 extern int myRotation;              // Rotation
 extern int lampVal;                 // The current Lamp value
 extern int autoLamp;                // Automatic lamp mode
+extern int framerateLimit;          // Minimal frame duration
 
 /*
  * Useful utility when debugging... 
@@ -90,6 +91,7 @@ void loadPrefs(fs::FS &fs){
     // process all the settings
     lampVal = jsonExtract(prefs, "lamp").toInt();
     autoLamp = jsonExtract(prefs, "autolamp").toInt();
+    framerateLimit = jsonExtract(prefs, "framerate_limit").toInt();
     s->set_framesize(s, (framesize_t)jsonExtract(prefs, "framesize").toInt());
     s->set_quality(s, jsonExtract(prefs, "quality").toInt());
     s->set_brightness(s, jsonExtract(prefs, "brightness").toInt());
@@ -136,6 +138,7 @@ void savePrefs(fs::FS &fs){
   *p++ = '{';
   p+=sprintf(p, "\"lamp\":%i,", lampVal);
   p+=sprintf(p, "\"autolamp\":%u,", autoLamp);
+  p+=sprintf(p, "\"framerate_limit\":%d,", framerateLimit);
   p+=sprintf(p, "\"framesize\":%u,", s->status.framesize);
   p+=sprintf(p, "\"quality\":%u,", s->status.quality);
   p+=sprintf(p, "\"brightness\":%d,", s->status.brightness);