How to detect whether photo/video was taken from c

问题:

In my website I have a file input tag to upload photo/video. When the website is opened in mobile safari, and when we click on the file input, an Action sheet opens up with 3 options take photo or Video, choose Existing and cancel. Is there anyway to determine in js that the file was taken from camera(take photo or video), or imported(choose existing) from camera roll ?

回答1:

I've a php solution implemented from this, I'm not sure that that's going to help you, but here is the code:

<?php

$camera = cameraUsed("C:\Users\Ale\Pictures\sep7imodia.jpg");
echo "Camera Used: " . $camera['make'] . " " . $camera['model'] . "<br />";
echo "Exposure Time: " . $camera['exposure'] . "<br />";
echo "Aperture: " . $camera['aperture'] . "<br />";
echo "ISO: " . $camera['iso'] . "<br />";
echo "Date Taken: " . $camera['date'];

// This function is used to determine the camera details for a specific image. It returns an array with the parameters.

function cameraUsed($imagePath) {

// Check if the variable is set and if the file itself exists before continuing
if ((isset($imagePath)) and (file_exists($imagePath))) {

  // There are 2 arrays which contains the information we are after, so it's easier to state them both
  $exif_ifd0 = read_exif_data($imagePath ,'IFD0' ,0);      
  $exif_exif = read_exif_data($imagePath ,'EXIF' ,0);

  //error control
  $notFound = "Unavailable";

  // Make
  if (@array_key_exists('Make', $exif_ifd0)) {
    $camMake = $exif_ifd0['Make'];
  } else { $camMake = $notFound; }

  // Model
  if (@array_key_exists('Model', $exif_ifd0)) {
    $camModel = $exif_ifd0['Model'];
  } else { $camModel = $notFound; }

  // Exposure
  if (@array_key_exists('ExposureTime', $exif_ifd0)) {
    $camExposure = $exif_ifd0['ExposureTime'];
  } else { $camExposure = $notFound; }

  // Aperture
  if (@array_key_exists('ApertureFNumber', $exif_ifd0['COMPUTED'])) {
    $camAperture = $exif_ifd0['COMPUTED']['ApertureFNumber'];
  } else { $camAperture = $notFound; }

  // Date
  if (@array_key_exists('DateTime', $exif_ifd0)) {
    $camDate = $exif_ifd0['DateTime'];
  } else { $camDate = $notFound; }

  // ISO
  if (@array_key_exists('ISOSpeedRatings',$exif_exif)) {
    $camIso = $exif_exif['ISOSpeedRatings'];
  } else { $camIso = $notFound; }

  $return = array();
  $return['make'] = $camMake;
  $return['model'] = $camModel;
  $return['exposure'] = $camExposure;
  $return['aperture'] = $camAperture;
  $return['date'] = $camDate;
  $return['iso'] = $camIso;
  return $return;

} else {
  return false;
}
}

?>

You can take the $camera['date'] value to compare with the actual datetime, and if there are a few seconds difference, you can assume it was taken by the phone just now.