<?php
/**
 * @file
 * FileField Meta: Add Video Support to File Field.
 */

/**
 * Implementation of hook_install().
 */
function filefield_meta_install() {
  drupal_install_schema('filefield_meta');
}

function filefield_meta_uninstall() {
  drupal_uninstall_schema('filefield_meta');
}

/**
 * Implementation of hook_schema().
 */
function filefield_meta_schema() {
  $schema = array();
  // The primary field/index.
  $schema['filefield_meta'] = array(
    'description' => 'The table for meta data about filefield files.',
    'fields' => array(
      'fid' => array(
        'description' => 'The file id.',
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
      ),
      'width' => array(
        'description' => 'Width of a video or image file in pixels.',
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => FALSE,
      ),
      'height' => array(
        'description' => 'Height of a video or image file in pixels.',
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => FALSE,
      ),
      'duration' => array(
        'description' => 'The duration of audio or video files, in seconds.',
        'type' => 'float',
        'size' => 'normal',
        'not null' => FALSE,
      ),
      'audio_format' => array(
        'description' => 'The audio format.',
        'type' => 'varchar',
        'length' => 10,
        'not null' => TRUE,
        'default' => '',
      ),
      'audio_sample_rate' => array(
        'description' => 'The sample rate of the audio.',
        'type' => 'int',
        'size' => 'medium',
        'not null' => TRUE,
        'default' => 0,
      ),
      'audio_channel_mode' => array(
        'description' => 'The number of channels in the audio, by name (stereo or mono).',
        'type' => 'varchar',
        'length' => 10,
        'not null' => TRUE,
        'default' => '',
      ),
      'audio_bitrate' => array(
        'description' => 'The audio bitrate.',
        'type' => 'float',
        'size' => 'medium',
        'not null' => TRUE,
        'default' => 0,
      ),
      'audio_bitrate_mode' => array(
        'description' => 'The kind of audio bitrate, such as VBR. Usually empty.',
        'type' => 'varchar',
        'length' => 4,
        'not null' => TRUE,
        'default' => '',
      ),
      'tags' => array(
        'description' => 'ID3 tags such as artist, album, and genre.',
        'type' => 'text',
        'serialize' => TRUE,
      ),
    ),
    'primary key' => array('fid'),
  );

  return $schema;
}

function filefield_meta_update_1() {
  $ret = array();
  db_add_field($ret, 'filefield_meta', 'audio_format', array(
    'description' => 'The audio format.',
    'type' => 'varchar',
    'length' => 10,
    'not null' => TRUE,
    'default' => '',
  ));
  db_add_field($ret, 'filefield_meta', 'audio_sample_rate', array(
    'description' => 'The sample rate of the audio.',
    'type' => 'int',
    'size' => 'medium',
    'not null' => TRUE,
    'default' => 0,
  ));
  db_add_field($ret, 'filefield_meta', 'audio_channel_mode', array(
    'description' => 'The number of channels in the audio, by name.',
    'type' => 'varchar',
    'length' => 10,
    'not null' => TRUE,
    'default' => '',
  ));
  db_add_field($ret, 'filefield_meta', 'audio_bitrate', array(
    'description' => 'The audio bitrate.',
    'type' => 'float',
    'size' => 'medium',
    'not null' => TRUE,
    'default' => 0,
  ));
  db_add_field($ret, 'filefield_meta', 'audio_bitrate_mode', array(
    'description' => 'The kind of audio bitrate.',
    'type' => 'varchar',
    'length' => 4,
    'not null' => TRUE,
    'default' => '',
  ));
  return $ret;
}

/**
 * Add the tags column.
 */
function filefield_meta_update_6100(&$context) {
  $ret = array();

  // Set up our update and add the tags column.
  if (!isset($context['sandbox']['progress'])) {
    $context['sandbox']['progress'] = 0;
    $context['sandbox']['total'] = db_result(db_query("SELECT COUNT(*) FROM {files} f INNER JOIN {filefield_meta} fm ON f.fid = fm.fid WHERE fm.audio_format <> ''"));
    $context['sandbox']['current_fid'] = 0;
    if (!db_column_exists('filefield_meta', 'tags')) {
      db_add_field($ret, 'filefield_meta', 'tags', array('type' => 'text'));
    }
    // We are done if there are none to update.
    if ($context['sandbox']['total'] == 0) {
      return $ret;
    }
  }

  // Select and process 200 files at a time.
  $limit = 200;
  $result = db_query_range("SELECT f.* FROM {files} f INNER JOIN {filefield_meta} fm ON f.fid = fm.fid WHERE f.fid > %d AND fm.audio_format <> '' ORDER BY f.fid ASC", $context['sandbox']['current_fid'], 0, $limit);

  // Loop through each file and read in its ID3 tags if applicable.
  while ($file = db_fetch_object($result)) {
    filefield_meta_file_update($file);
    $context['sandbox']['current_fid'] = $file->fid;
    $context['sandbox']['progress']++;
  }

  // Update our progress indicator.
  $ret['#finished'] = $context['sandbox']['progress'] / $context['sandbox']['total'];

  return $ret;
}