#!/bin/bash
# Author: twily.info    2025
#
# to load wifi camera as usb video class (uvc) like
# /dev/video0
#
# (download arduino appimage and make executaable;
# https://www.arduino.cc/en/software/ )
#
# (to flash to esp, short IO0 to GND while it is starting
#  hold the short until Uploading begins ~ is a timing thing)
#
# install stuff~ FDTI and v4l2
# $ sudo apt install cp2102 v4l2loopback-dkms 
# $ sudo apt install ffmpeg
# $ sudo apt install gstreamer1.0-tools gstreamer1.0-plugins-base gstreamer1.0-plugins-good gstreamer1.0-plugins-bad gstreamer1.0-libav
# $ sudo apt install gstreamer1.0-plugins-good
#
# crontab (remove sudo's and setup on root):
# reboot screen -dmS esp32cam /home/amalie/scripts/esp32-cam-ffmpeg-gst-uvc.sh
#
# ----
# specific to eps32-cam camerawebserver
# load up arduino ide (available on linux)
#
# add preferances additional url;
#
#  https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
#
# create clean example of camerawebserver (templates);
#
# setup wifi ssid and password to connect
#
# add under stream_handler to customize defaults;
#
#  // Force VGA resolution
#  sensor_t *s = esp_camera_sensor_get();
#  s->set_framesize(s, FRAMESIZE_VGA);
#  s->set_brightness(s, 1);  // -2 to 2 (0 = default)
#  s->set_contrast(s, -1);    // -2 to 2 (0 = default)
#  s->set_saturation(s, 1);  // -2 to 2 (0 = default)
#  s->set_whitebal(s, 1);    // 1 = enable auto white balance, 0 = disable
#  s->set_awb_gain(s, 1);    // 1 = enable AWB gain, 0 = disable
#  s->set_wb_mode(s, 0);     // 0 = auto, 1 = sunny, 2 = cloudy, 3 = office, 4 = home
#
# optimizatioon code limit frametime for network load;
#   while (true) {
#    fb = esp_camera_fb_get();
#    if (!fb) {
#      log_e("Camera capture failed");
#      res = ESP_FAIL;
#      break;
#    }
#    size_t hlen = snprintf((char *)part_buf, 64, _STREAM_PART, fb->len);
#    res = httpd_send(req, (const char *)part_buf, hlen);
#    if (res == ESP_OK) {
#      res = httpd_send(req, (const char *)fb->buf, fb->len);
#    }
#    if (res == ESP_OK) {
#      res = httpd_send(req, _STREAM_BOUNDARY, strlen(_STREAM_BOUNDARY));
#    }
#    esp_camera_fb_return(fb);
#    if (res != ESP_OK) break;
#    vTaskDelay(66 / portTICK_PERIOD_MS); // ~15fps
#  }
#
# (Common resolution options:
#    FRAMESIZE_QQVGA (160x120)
#    FRAMESIZE_QCIF (176x144)
#    FRAMESIZE_DCIF (352x288)
#    FRAMESIZE_QVGA (320x240) [defaault]
#    FRAMESIZE_CIF (352x288)
#    FRAMESIZE_VGA (640x480)
#    FRAMESIZE_XGA (1024x768)
#    FRAMESIZE_UXGA (1600x1200) )
# ----

IP="10.0.0.91"
PORT="81"

while true; do
  sudo modprobe -r v4l2loopback  # Clear if needed
  sudo modprobe v4l2loopback devices=1 video_nr=0 exclusive_caps=1

  # use ffmpeg or gstreamer:
  #ffmpeg -reconnect 1 -reconnect_at_eof 1 -reconnect_streamed 1 -reconnect_delay_max 5 -timeout 30000000 -fflags nobuffer -analyzeduration 0 -probesize 32 -re -i http://$IP:$PORT/stream -f v4l2 -pix_fmt yuv420p /dev/video0
  gst-launch-1.0 souphttpsrc location=http://$IP:$PORT/stream is-live=true timeout=0 retries=-1 ! multipartdemux ! jpegdec ! videobalance brightness=0.1 contrast=0.8 saturation=1.2 ! videoconvert ! videorate ! video/x-raw,format=YUY2,width=640,height=480,framerate=15/1 ! v4l2sink device=/dev/video0 sync=false

  # debug
  #gst-launch-1.0 souphttpsrc location="http://$IP:$PORT/stream" ! multipartdemux ! jpegdec ! videobalance brightness=0.1 contrast=0.8 saturation=1.2 ! videoconvert ! autovideosink
  sleep 5  # Pause before retry
done

# debug
#sudo lsof /dev/video0

# debug
#v4l2loopback-ctl /dev/video0

# debug
#vlc v4l2:///dev/video0