/*


  ESP32-CAM-Video-Recorder-junior

  This program records an mjpeg avi video to the sd card of an ESP32-CAM.

  It is the junior version of   https://github.com/jameszah/ESP32-CAM-Video-Recorder
  which has 100 other features of wifi, streaming video, http control, telegram updates, pir control,
  touch control, ftp downloads, .... and other things that make it very big and complex.

  This one is written in simple arduino code without any semaphores, tasks, priorities, RTOS stuff ....

  Just set 4 parameters, compile and download, and it will record on power-on, until sd is full, or power-off.
  Then pull out the sd and move it to your computer, and you will see all but the last file avi which died during the unplug.

  Update:  I added some complexity.
     Connect Pin 12 to GND to stop a video -- no dead videos -- and prevent recording.
     Release Pin 12 and it will record forever.

  Compile Time Parameters
  1.  framesize 10,9,7,6,5 for 10 - UXGA (1600x1200 @ 6 fps), 9 - SXGA (1280x1024 @ 6 fps), 7 - SVGA(800x600 @ 24 fps), 6 - VGA(640x480 @ 24 fps), 5 - CIF(400x296 @ 50 fps)
  2.  quality - 1 to 63 - 10 is a good start, increase to 20 to get more frames per second - must be higher than jpeg_quality below
  3.  avi_length - seconds for each avi - it closes files, and starts another file after this time - like 60 or 1800
  4.  devname - a text name for your camera when the files are on your computer

  Note that framesize and high quality will produce lots of bytes which have to written to the sd.  Those frame rates above are
  for the OV2640 camera, and your sd card will have to be able to swallow all that data before the next frame.  If the
  sd card cannot take all that data, then the camera will be idle waiting for the sd.  Lower the framesize (UXGA -> SVGA),
  and lower the quality (10 -> 15 -> 20, higher number is lower quality) to improve framerate to the camera limits.
  If you have a fast enough sd card, it will record at the full speed of the camera.

  Using a Lexar 633x circle10, U3, V30 SD card, with quality set at 20, it will record at full speed of the camera -- in dull indoor light.
  In bright outdoor light - looking at the sun - it will slow down by half - to about 12 fps SVGA.  You could lower quality to keep that
  at a higher fps, if you insist on looking at the sun.

  Using a dollarstore SD card - EAGET circle10, U1 - it will record at about half of the camera capacity.

  You can look at the blinking red led on the back of the chip to see the recording rate -- sd chips for video are made to be more predictable.

  The files will have the name such as:

    desklens 10.3 + 120s.avi

    "desklens" is your devname
    10 - is a number stored in eprom that will increase everytime your device boots
    3 - is the 3rd file created during the current boot
    +120s - is an indictation of how long since we started recording on this boot
          - this is the 3rd file, and started 120 seconds after the boot, so the files must be 60 seconds long

  Small red led on the back blinks with every frame.


  by James Zahary Sep 12, 2020
     jamzah.plc@gmail.com

  https://github.com/jameszah/ESP32-CAM-Video-Recorder-junior
  https://github.com/jameszah/ESP32-CAM-Video-Recorder

    jameszah/ESP32-CAM-Video-Recorder is licensed under the
    GNU General Public License v3.0

    jameszah/ESP32-CAM-Video-Recorder-junior is licensed under the
    GNU General Public License v3.0

  The is Arduino code, with standard setup for ESP32-CAM
    - Board ESP32 Wrover Module
    - Partition Scheme Huge APP (3MB No OTA)

Compiled with Arduino 1.8.12, which used these libraries:

Using library SD_MMC at version 1.0 in folder: C:\Users\James\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.4\libraries\SD_MMC 
Using library FS at version 1.0 in folder: C:\Users\James\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.4\libraries\FS 
Using library EEPROM at version 1.0.3 in folder: C:\Users\James\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.4\libraries\EEPROM 

*/

static const char vernum[] = "v02";
static const char devname[] = "desklens";         // name of your camera for mDNS, Router, and filenames

int  framesize = 7;                //  10 UXGA, 9 SXGA, 7 SVGA, 6 VGA, 5 CIF
int  quality = 20;                 //  quality on the 1..63 scale  - lower is better quality and bigger files - must be higher than the jpeg_quality in camera_config
int avi_length = 180;               // how long a movie in seconds

int MagicNumber = 11;                // change this number to reset the epron in your esp32

//#define LOG_LOCAL_LEVEL ESP_LOG_VERBOSE
#include "esp_log.h"
#include "esp_http_server.h"
#include "esp_camera.h"


// CAMERA_MODEL_AI_THINKER
#define PWDN_GPIO_NUM     32
#define RESET_GPIO_NUM    -1
#define XCLK_GPIO_NUM      0
#define SIOD_GPIO_NUM     26
#define SIOC_GPIO_NUM     27
#define Y9_GPIO_NUM       35
#define Y8_GPIO_NUM       34
#define Y7_GPIO_NUM       39
#define Y6_GPIO_NUM       36
#define Y5_GPIO_NUM       21
#define Y4_GPIO_NUM       19
#define Y3_GPIO_NUM       18
#define Y2_GPIO_NUM        5
#define VSYNC_GPIO_NUM    25
#define HREF_GPIO_NUM     23
#define PCLK_GPIO_NUM     22

camera_fb_t * fb_curr = NULL;
camera_fb_t * fb_next = NULL;

#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_system.h"
#include "nvs_flash.h"
#include "nvs.h"
#include "soc/soc.h"
#include "soc/cpu.h"
#include "soc/rtc_cntl_reg.h"

static esp_err_t cam_err;


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//  Avi Writer Stuff here


// MicroSD
#include "driver/sdmmc_host.h"
#include "driver/sdmmc_defs.h"
#include "sdmmc_cmd.h"
#include "esp_vfs_fat.h"
#include <SD_MMC.h>

FILE *avifile = NULL;
FILE *idxfile = NULL;

long bp;
long ap;
long bw;
long aw;

int diskspeed = 0;
char fname[100];

static int i = 0;
uint8_t temp = 0, temp_last = 0;
unsigned long fileposition = 0;
uint16_t frame_cnt = 0;
uint16_t remnant = 0;
uint32_t length = 0;
uint32_t startms;
uint32_t elapsedms;
uint32_t uVideoLen = 0;
bool is_header = false;
int bad_jpg = 0;
int extend_jpg = 0;
int normal_jpg = 0;

int file_number = 0;
int file_group = 0;
long boot_time = 0;

long totalp;
long totalw;
float avgp;
float avgw;

#define BUFFSIZE 512

uint8_t buf[BUFFSIZE];

#define AVIOFFSET 240 // AVI main header length

unsigned long movi_size = 0;
unsigned long jpeg_size = 0;
unsigned long idx_offset = 0;

uint8_t zero_buf[4] = {0x00, 0x00, 0x00, 0x00};
uint8_t dc_buf[4] = {0x30, 0x30, 0x64, 0x63};    // "00dc"
uint8_t dc_and_zero_buf[8] = {0x30, 0x30, 0x64, 0x63, 0x00, 0x00, 0x00, 0x00};

uint8_t avi1_buf[4] = {0x41, 0x56, 0x49, 0x31};    // "AVI1"
uint8_t idx1_buf[4] = {0x69, 0x64, 0x78, 0x31};    // "idx1"

uint8_t  vga_w[2] = {0x80, 0x02}; // 640
uint8_t  vga_h[2] = {0xE0, 0x01}; // 480
uint8_t  cif_w[2] = {0x90, 0x01}; // 400
uint8_t  cif_h[2] = {0x28, 0x01}; // 296
uint8_t svga_w[2] = {0x20, 0x03}; // 800
uint8_t svga_h[2] = {0x58, 0x02}; // 600
uint8_t sxga_w[2] = {0x00, 0x05}; // 1280
uint8_t sxga_h[2] = {0x00, 0x04}; // 1024
uint8_t uxga_w[2] = {0x40, 0x06}; // 1600
uint8_t uxga_h[2] = {0xB0, 0x04}; // 1200


const int avi_header[AVIOFFSET] PROGMEM = {
  0x52, 0x49, 0x46, 0x46, 0xD8, 0x01, 0x0E, 0x00, 0x41, 0x56, 0x49, 0x20, 0x4C, 0x49, 0x53, 0x54,
  0xD0, 0x00, 0x00, 0x00, 0x68, 0x64, 0x72, 0x6C, 0x61, 0x76, 0x69, 0x68, 0x38, 0x00, 0x00, 0x00,
  0xA0, 0x86, 0x01, 0x00, 0x80, 0x66, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00,
  0x64, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x80, 0x02, 0x00, 0x00, 0xe0, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x4C, 0x49, 0x53, 0x54, 0x84, 0x00, 0x00, 0x00,
  0x73, 0x74, 0x72, 0x6C, 0x73, 0x74, 0x72, 0x68, 0x30, 0x00, 0x00, 0x00, 0x76, 0x69, 0x64, 0x73,
  0x4D, 0x4A, 0x50, 0x47, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0A, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x73, 0x74, 0x72, 0x66,
  0x28, 0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x00, 0x80, 0x02, 0x00, 0x00, 0xe0, 0x01, 0x00, 0x00,
  0x01, 0x00, 0x18, 0x00, 0x4D, 0x4A, 0x50, 0x47, 0x00, 0x84, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x49, 0x4E, 0x46, 0x4F,
  0x10, 0x00, 0x00, 0x00, 0x6A, 0x61, 0x6D, 0x65, 0x73, 0x7A, 0x61, 0x68, 0x61, 0x72, 0x79, 0x20,
  0x76, 0x30, 0x32, 0x20, 0x4C, 0x49, 0x53, 0x54, 0x00, 0x01, 0x0E, 0x00, 0x6D, 0x6F, 0x76, 0x69,
};




//
// Writes an uint32_t in Big Endian at current file position
//
static void inline print_quartet(unsigned long i, FILE * fd)
{
  uint8_t y[4];

  y[0] = i % 0x100;
  y[1] = (i >> 8) % 0x100;
  y[2] = (i >> 16) % 0x100;
  y[3] = (i >> 24) % 0x100;

  size_t i1_err = fwrite(y , 1, 4, fd);
}

//
// Writes 2 uint32_t in Big Endian at current file position
//
static void inline print_2quartet(unsigned long i, unsigned long j, FILE * fd)
{
  uint8_t y[8];

  y[0] = i % 0x100;
  y[1] = (i >> 8) % 0x100;
  y[2] = (i >> 16) % 0x100;
  y[3] = (i >> 24) % 0x100;
  y[4] = j % 0x100;
  y[5] = (j >> 8) % 0x100;
  y[6] = (j >> 16) % 0x100;
  y[7] = (j >> 24) % 0x100;

  size_t i1_err = fwrite(y , 1, 8, fd);
}

//
// if we have no camera, or sd card, then flash rear led on and off to warn the human SOS - SOS
//
void major_fail() {

  Serial.println(" ");

  for  (int i = 0;  i < 10; i++) {                 // 10 loops or about 100 seconds then reboot
    for (int j = 0; j < 3; j++) {
      digitalWrite(33, LOW);   delay(150);
      digitalWrite(33, HIGH);  delay(150);
    }
    delay(1000);

    for (int j = 0; j < 3; j++) {
      digitalWrite(33, LOW);  delay(500);
      digitalWrite(33, HIGH); delay(500);
    }
    delay(1000);
    Serial.print("Major Fail  "); Serial.print(i); Serial.print(" / "); Serial.println(10);
  }

  ESP.restart();
}

static esp_err_t config_camera() {

  camera_config_t config;

  //Serial.println("config camera");

  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 = 10000000;     // 10000000 or 20000000 -- 10 is faster !!

  config.pixel_format = PIXFORMAT_JPEG;

  config.frame_size = FRAMESIZE_UXGA; // edit in framesizes below -- this must be better than the framesize specified at the top
  /*
      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
  */

  config.jpeg_quality = 6;  // 1 to 63 - smaller number is higher quality and more data - must be lower rhat the quality parameter at the top
  
  config.fb_count = 7;

  // camera init
  cam_err = esp_camera_init(&config);
  if (cam_err != ESP_OK) {
    Serial.printf("Camera init failed with error 0x%x", cam_err);
  }


  sensor_t * ss = esp_camera_sensor_get();
  ss->set_quality(ss, quality);
  ss->set_framesize(ss, (framesize_t)framesize);

  ss->set_brightness(ss, 1);  //up the blightness just a bit
  ss->set_saturation(ss, -2); //lower the saturation

  delay(500);
  for (int j = 0; j < 5; j++) {
    camera_fb_t * fb = esp_camera_fb_get();
    //Serial.print("Pic, len="); Serial.println(fb->len);
    esp_camera_fb_return(fb);
    delay(50);
  }

}

static esp_err_t init_sdcard()
{

  pinMode(13, PULLUP);

  esp_err_t ret = ESP_FAIL;
  sdmmc_host_t host = SDMMC_HOST_DEFAULT();
  host.flags = SDMMC_HOST_FLAG_1BIT;                       // using 1 bit mode
  host.max_freq_khz = SDMMC_FREQ_HIGHSPEED;
  diskspeed = host.max_freq_khz;
  sdmmc_slot_config_t slot_config = SDMMC_SLOT_CONFIG_DEFAULT();
  slot_config.width = 1;                                   // using 1 bit mode
  esp_vfs_fat_sdmmc_mount_config_t mount_config = {
    .format_if_mount_failed = false,
    .max_files = 8,
  };

  sdmmc_card_t *card;

  ret = esp_vfs_fat_sdmmc_mount("/sdcard", &host, &slot_config, &mount_config, &card);

  if (ret == ESP_OK) {
    Serial.println("SD card mount successfully!");
  }  else  {
    Serial.printf("Failed to mount SD card VFAT filesystem. Error: %s", esp_err_to_name(ret));
    major_fail();
  }

  sdmmc_card_print_info(stdout, card);

}


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
//  get_good_jpeg()  - take a picture and make sure it has a good jpeg
//
camera_fb_t *  get_good_jpeg() {

  camera_fb_t * fb;

  do {
    bp = millis();
    fb = esp_camera_fb_get();
    totalp = totalp + millis() - bp;
    
    int x = fb->len;
    int foundffd9 = 0;

    for (int j = 1; j <= 1025; j++) {
      if (fb->buf[x - j] != 0xD9) {
        // no d9, try next for
      } else {

        //Serial.println("Found a D9");
        if (fb->buf[x - j - 1] == 0xFF ) {
          //Serial.print("Found the FFD9, junk is "); Serial.println(j);
          if (j == 1) {
            normal_jpg++;
          } else {
            extend_jpg++;
          }
          if (j > 1000) { //  never happens. but > 1 does, usually 400-500
            Serial.print("Frame "); Serial.print(frame_cnt);
            Serial.print(", Len = "); Serial.print(x);
            Serial.print(", Corrent Len = "); Serial.print(x - j + 1);
            Serial.print(", Extra Bytes = "); Serial.println( j - 1);
          }
          foundffd9 = 1;
          break;
        }
      }
    }

    if (!foundffd9) {
      bad_jpg++;
      Serial.print("Bad jpeg, Len = "); Serial.println(x);
      esp_camera_fb_return(fb);

    } else {
      break;
      // count up the useless bytes
    }

  } while (1);

  return fb;

}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
//  eprom functions  - increment the file_group, so files are always unique
//

#include <EEPROM.h>

struct eprom_data {
  int eprom_good;
  int file_group;
};

void do_eprom_read() {

  eprom_data ed;

  EEPROM.begin(200);
  EEPROM.get(0, ed);

  if (ed.eprom_good == MagicNumber) {
    Serial.println("Good settings in the EPROM ");
    file_group = ed.file_group;
    file_group++;
    Serial.print("New File Group "); Serial.println(file_group );
  } else {
    Serial.println("No settings in EPROM - Starting with File Group 1 ");
    file_group = 1;
  }
  do_eprom_write();
  file_number = 1;
}

void do_eprom_write() {

  eprom_data ed;

  ed.eprom_good = MagicNumber;
  ed.file_group  = file_group;

  Serial.println("Writing to EPROM ...");

  EEPROM.begin(200);
  EEPROM.put(0, ed);
  EEPROM.commit();
  EEPROM.end();
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Make the avi functions
//
//   start_avi() - open the file and write headers
//   another_pic_avi() - write one more frame of movie
//   end_avi() - write the final parameters and close the file


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// start_avi - open the files and write in headers
//


static esp_err_t start_avi() {

  Serial.println("Starting an avi ");

  sprintf(fname, "/sdcard/%s %d.%d + %ds.avi",  devname, file_group, file_number, (millis() - boot_time) / 1000);

  file_number++;

  avifile = fopen(fname, "w");
  idxfile = fopen("/sdcard/idx.tmp", "w");

  if (avifile != NULL)  {
    Serial.printf("File open: %s\n", fname);
  }  else  {
    Serial.println("Could not open file");
    major_fail();
  }

  if (idxfile != NULL)  {
    Serial.printf("File open: %s\n", "/sdcard/idx.tmp");
  }  else  {
    Serial.println("Could not open file");
    major_fail();
  }

  for ( i = 0; i < AVIOFFSET; i++)
  {
    char ch = pgm_read_byte(&avi_header[i]);
    buf[i] = ch;
  }

  size_t err = fwrite(buf, 1, AVIOFFSET, avifile);

  if (framesize == 6) {

    fseek(avifile, 0x40, SEEK_SET);
    err = fwrite(vga_w, 1, 2, avifile);
    fseek(avifile, 0xA8, SEEK_SET);
    err = fwrite(vga_w, 1, 2, avifile);
    fseek(avifile, 0x44, SEEK_SET);
    err = fwrite(vga_h, 1, 2, avifile);
    fseek(avifile, 0xAC, SEEK_SET);
    err = fwrite(vga_h, 1, 2, avifile);

  } else if (framesize == 10) {

    fseek(avifile, 0x40, SEEK_SET);
    err = fwrite(uxga_w, 1, 2, avifile);
    fseek(avifile, 0xA8, SEEK_SET);
    err = fwrite(uxga_w, 1, 2, avifile);
    fseek(avifile, 0x44, SEEK_SET);
    err = fwrite(uxga_h, 1, 2, avifile);
    fseek(avifile, 0xAC, SEEK_SET);
    err = fwrite(uxga_h, 1, 2, avifile);

  } else if (framesize == 9) {

    fseek(avifile, 0x40, SEEK_SET);
    err = fwrite(sxga_w, 1, 2, avifile);
    fseek(avifile, 0xA8, SEEK_SET);
    err = fwrite(sxga_w, 1, 2, avifile);
    fseek(avifile, 0x44, SEEK_SET);
    err = fwrite(sxga_h, 1, 2, avifile);
    fseek(avifile, 0xAC, SEEK_SET);
    err = fwrite(sxga_h, 1, 2, avifile);

  } else if (framesize == 7) {

    fseek(avifile, 0x40, SEEK_SET);
    err = fwrite(svga_w, 1, 2, avifile);
    fseek(avifile, 0xA8, SEEK_SET);
    err = fwrite(svga_w, 1, 2, avifile);
    fseek(avifile, 0x44, SEEK_SET);
    err = fwrite(svga_h, 1, 2, avifile);
    fseek(avifile, 0xAC, SEEK_SET);
    err = fwrite(svga_h, 1, 2, avifile);

  }  else if (framesize == 5) {

    fseek(avifile, 0x40, SEEK_SET);
    err = fwrite(cif_w, 1, 2, avifile);
    fseek(avifile, 0xA8, SEEK_SET);
    err = fwrite(cif_w, 1, 2, avifile);
    fseek(avifile, 0x44, SEEK_SET);
    err = fwrite(cif_h, 1, 2, avifile);
    fseek(avifile, 0xAC, SEEK_SET);
    err = fwrite(cif_h, 1, 2, avifile);
  }

  fseek(avifile, AVIOFFSET, SEEK_SET);

  Serial.print(F("\nRecording "));
  Serial.print(avi_length);
  Serial.println(" seconds.");

  startms = millis();

  totalp = 0;
  totalw = 0;

  jpeg_size = 0;
  movi_size = 0;
  uVideoLen = 0;
  idx_offset = 4;

  frame_cnt = 0;

  bad_jpg = 0;
  extend_jpg = 0;
  normal_jpg = 0;

} // end of start avi

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
//  another_save_avi saves another frame to the avi file, uodates index
//           -- pass in a fb pointer to the frame to add
//
//

static esp_err_t another_save_avi(camera_fb_t * fb ) {

  int fblen;
  fblen = fb->len;

  jpeg_size = fblen;
  movi_size += jpeg_size;
  uVideoLen += jpeg_size;

  bw = millis();

  size_t dc_err = fwrite(dc_and_zero_buf, 1, 8, avifile);

  size_t err = fwrite(fb->buf, 1, fb->len, avifile);
  if (err != fb->len) {
    Serial.print("Error on avi write: err = "); Serial.print(err);
    Serial.print(" len = "); Serial.println(fb->len);
  }

  remnant = (4 - (jpeg_size & 0x00000003)) & 0x00000003;

  print_2quartet(idx_offset, jpeg_size, idxfile);

  idx_offset = idx_offset + jpeg_size + remnant + 8;

  jpeg_size = jpeg_size + remnant;
  movi_size = movi_size + remnant;
  if (remnant > 0) {
    size_t rem_err = fwrite(zero_buf, 1, remnant, avifile);
  }

  fileposition = ftell (avifile);       // Here, we are at end of chunk (after padding)
  fseek(avifile, fileposition - jpeg_size - 4, SEEK_SET);    // Here we are the the 4-bytes blank placeholder

  print_quartet(jpeg_size, avifile);    // Overwrite placeholder with actual frame size (without padding)

  fileposition = ftell (avifile);

  fseek(avifile, fileposition + jpeg_size  , SEEK_SET);

  totalw = totalw + millis() - bw;

} // end of another_pic_avi

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
//  end_avi writes the index, and closes the files
//

static esp_err_t end_avi() {

  unsigned long current_end = 0;

  current_end = ftell (avifile);

  Serial.println("End of avi - closing the files");

  elapsedms = millis() - startms;

  float fRealFPS = (1000.0f * (float)frame_cnt) / ((float)elapsedms);

  float fmicroseconds_per_frame = 1000000.0f / fRealFPS;
  uint8_t iAttainedFPS = round(fRealFPS);
  uint32_t us_per_frame = round(fmicroseconds_per_frame);

  //Modify the MJPEG header from the beginning of the file, overwriting various placeholders

  fseek(avifile, 4 , SEEK_SET);
  print_quartet(movi_size + 240 + 16 * frame_cnt + 8 * frame_cnt, avifile);

  fseek(avifile, 0x20 , SEEK_SET);
  print_quartet(us_per_frame, avifile);

  unsigned long max_bytes_per_sec = movi_size * iAttainedFPS / frame_cnt;

  fseek(avifile, 0x24 , SEEK_SET);
  print_quartet(max_bytes_per_sec, avifile);

  fseek(avifile, 0x30 , SEEK_SET);
  print_quartet(frame_cnt, avifile);

  fseek(avifile, 0x8c , SEEK_SET);
  print_quartet(frame_cnt, avifile);

  fseek(avifile, 0x84 , SEEK_SET);
  print_quartet((int)iAttainedFPS, avifile);

  fseek(avifile, 0xe8 , SEEK_SET);
  print_quartet(movi_size + frame_cnt * 8 + 4, avifile);

  Serial.println(F("\n*** Video recorded and saved ***\n"));
  Serial.print(F("Recorded "));
  Serial.print(elapsedms / 1000);
  Serial.print(F("s in "));
  Serial.print(frame_cnt);
  Serial.print(F(" frames\nFile size is "));
  Serial.print(movi_size + 12 * frame_cnt + 4);
  Serial.print(F(" bytes\nActual FPS is "));
  Serial.print(fRealFPS, 2);
  Serial.print(F("\nMax data rate is "));
  Serial.print(max_bytes_per_sec);
  Serial.print(F(" byte/s\nFrame duration is "));  Serial.print(us_per_frame);  Serial.println(F(" us"));
  Serial.print(F("Average frame length is "));  Serial.print(uVideoLen / frame_cnt);  Serial.println(F(" bytes"));
  Serial.print("Average picture time (ms) "); Serial.println( 1.0 * totalp / frame_cnt);
  Serial.print("Average write time (ms)   "); Serial.println( totalw / frame_cnt );
  Serial.print("Normal jpg % ");  Serial.println( 100.0 * normal_jpg / frame_cnt, 1 );
  Serial.print("Extend jpg % ");  Serial.println( 100.0 * extend_jpg / frame_cnt, 1 );
  Serial.print("Bad    jpg % ");  Serial.println( 100.0 * bad_jpg / frame_cnt, 1 );


  Serial.printf("Writng the index, %d frames\n", frame_cnt);
  fseek(avifile, current_end, SEEK_SET);

  fclose(idxfile);

  size_t i1_err = fwrite(idx1_buf, 1, 4, avifile);

  print_quartet(frame_cnt * 16, avifile);

  idxfile = fopen("/sdcard/idx.tmp", "r");

  if (idxfile != NULL)  {
    Serial.printf("File open: %s\n", "/sdcard/idx.tmp");
  }  else  {
    Serial.println("Could not open index file");
    major_fail();
  }

  char * AteBytes;
  AteBytes = (char*) malloc (8);

  for (int i = 0; i < frame_cnt; i++) {
    size_t res = fread ( AteBytes, 1, 8, idxfile);
    size_t i1_err = fwrite(dc_buf, 1, 4, avifile);
    size_t i2_err = fwrite(zero_buf, 1, 4, avifile);
    size_t i3_err = fwrite(AteBytes, 1, 8, avifile);
  }

  free(AteBytes);
  fclose(idxfile);
  fclose(avifile);
  int xx = remove("/sdcard/idx.tmp");

  Serial.println("---");

}


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

void setup() {
  Serial.begin(115200);
  Serial.println("\n\n---");

  pinMode(33, OUTPUT);             // little red led on back of chip
  digitalWrite(33, LOW);           // turn on the red LED on the back of chip

  pinMode(4, OUTPUT);               // Blinding Disk-Avtive Light
  digitalWrite(4, LOW);             // turn off

  pinMode(12, INPUT_PULLUP);        // pull this down to stop recording

  //Serial.setDebugOutput(true);

  // zzz
  Serial.println("                                    ");
  Serial.println("-------------------------------------");
  Serial.printf("ESP32-CAM-Video-Recorder-junior %s\n", vernum);
  Serial.println("-------------------------------------");

  Serial.print("setup, core ");  Serial.print(xPortGetCoreID());
  Serial.print(", priority = "); Serial.println(uxTaskPriorityGet(NULL));

  // put your setup code here, to run once:
  Serial.printf("Internal Total heap %d, internal Free Heap %d\n", ESP.getHeapSize(), ESP.getFreeHeap());
  Serial.printf("SPIRam Total heap   %d, SPIRam Free Heap   %d\n", ESP.getPsramSize(), ESP.getFreePsram());

  Serial.println("Setting up the camera ...");

  config_camera();

  Serial.printf("Internal Total heap %d, internal Free Heap %d\n", ESP.getHeapSize(), ESP.getFreeHeap());
  Serial.printf("SPIRam Total heap   %d, SPIRam Free Heap   %d\n", ESP.getPsramSize(), ESP.getFreePsram());

  // SD camera init
  esp_err_t card_err = init_sdcard();
  if (card_err != ESP_OK) {
    Serial.printf("SD Card init failed with error 0x%x", card_err);
    major_fail();
    return;
  }

  Serial.printf("Internal Total heap %d, internal Free Heap %d\n", ESP.getHeapSize(), ESP.getFreeHeap());
  Serial.printf("SPIRam Total heap   %d, SPIRam Free Heap   %d\n", ESP.getPsramSize(), ESP.getFreePsram());

  digitalWrite(33, HIGH);         // red light turns off when setup is complete

  Serial.println("Warming up the camera ... here are some frames sizes ...");

  for (int i = 0; i < 10; i++) {
    camera_fb_t * fb = esp_camera_fb_get();
    Serial.printf("frame %d, len %d\n", i, fb->len);
    esp_camera_fb_return(fb);
    delay(100);
  }

  do_eprom_read();

  Serial.println("  End of setup()\n\n");

  boot_time = millis();
}



int first = 1;
int frames = 0;
long frame_start = 0;
long frame_end = 0;
long frame_total = 0;
long frame_average = 0;
long loop_average = 0;
long loop_total = 0;
long total_frame_data = 0;
long last_frame_length = 0;
int done = 0;
long avi_start_time = 0;
long avi_end_time = 0;
int stop = 0;
int we_are_already_stopped = 0;

void loop() {
  if (first) {
    Serial.print("the loop, core ");  Serial.print(xPortGetCoreID());
    Serial.print(", priority = "); Serial.println(uxTaskPriorityGet(NULL));
    first = 0;
  }

  frames++;
  frame_cnt = frames;

  stop = digitalRead(12);

  if (frames == 1 ) {                              // start the avi

    if (stop == 0) {

      if (we_are_already_stopped == 0) Serial.println("\n\nCannot start video, as Pin 12 is connected to GND\n\n");
      frames--;
      we_are_already_stopped = 1;
      delay(1000);
      
    } else {
      we_are_already_stopped = 0;

      avi_start_time = millis();
      Serial.printf("Start the avi ... at %d\n", avi_start_time);

      fb_curr = get_good_jpeg();                     // should take zero time

      start_avi();

      fb_next = get_good_jpeg();                    // should take nearly zero time due to time spent writing header

      another_save_avi( fb_curr);                  // put first frame in avi

      digitalWrite(33, frames % 2);                // blink
      esp_camera_fb_return(fb_curr);               // get rid of first frame
    }
  } else if ( stop == 0 ||  millis() > (avi_start_time + avi_length * 1000)) { // end the avi

    fb_curr = fb_next;
    another_save_avi(fb_curr);                 // save final frame of avi
    digitalWrite(33, frames % 2);
    esp_camera_fb_return(fb_curr);

    end_avi();                                // end the movie

    digitalWrite(33, HIGH);          // light off
    avi_end_time = millis();

    float fps = frames / ((avi_end_time - avi_start_time) / 1000) ;
    Serial.printf("End the avi at %d.  It was %d frames, %d ms at %.1f fps...\n", millis(), frames, avi_end_time, avi_end_time - avi_start_time, fps);

    frames = 0;             // start recording again on the next loop

  } else {  // another frame of the avi


    fb_curr = fb_next;           // we will write a frame, and get the camera preparing a new one

    fb_next = get_good_jpeg();    // should take near zero, unless the sd is faster than the camera, when we will have to wait for the camera

    another_save_avi(fb_curr);

    digitalWrite(33, frames % 2);

    esp_camera_fb_return(fb_curr);

    if (frames % 100 == 0 ) {     // print some status every 100 frames

      float fps =   1.0 * frames / ((millis() - avi_start_time) / 1000) ;
      Serial.printf("So far: %d frames, %d ms at %.2f fps...\n", frames, millis() - avi_start_time, fps);
    }
  }
}