//

// This file is part of the Gaia Video app. It uses the MediaDB libarary

// and the code in metadata.js to ensure that the videos[] array is up to date.

//

function initDB() {

// use excludeFilter to ignore dummy files from camera.

videodb = new MediaDB('videos', null,

{excludeFilter: /DCIM\/\d{3}MZLLA\/\.VID_\d{4}\.3gp$/});

videodb.onupgrading = function(evt) {

// show dialog in upgradestart, when it finished, it will turned to ready.

storageState = MediaDB.UPGRADING;

updateDialog();

};

videodb.onunavailable = function(event) {

storageState = event.detail;

// If player is playing, we need to hide the player which pauses the player

// and unloads the video file.

if (playerShowing) {

hidePlayer(true);

}

updateDialog();

};

// On devices that have internal and external storage, we get this event

// when the user pulls the sdcard out. If we're playing a video when that

// happens, we need to stop or risk a crash.

videodb.oncardremoved = function() {

if (playerShowing)

hidePlayer(true);

};

videodb.onready = function() {

storageState = false;

updateDialog();

enumerateDB();

};

videodb.onscanend = function() {

firstScanEnded = true;

updateDialog();

};

videodb.oncreated = function(event) {

event.detail.forEach(videoCreated);

};

videodb.ondeleted = function(event) {

event.detail.forEach(videoDeleted);

};

}

// Remember whether we've already run the enumeration step

var enumerated = false;

// This function runs once when the app starts up. It gets all known videos

// from the MediaDB and handles the appropriately

function enumerateDB() {

if (enumerated)

return;

enumerated = true;

var batch = [];

var batchSize = 4;

videodb.enumerate('date', null, 'prev', function(videoinfo) {

// When we're done with the enumeration flush any batched files

if (videoinfo === null) {

flush();

return;

}

var isVideo = videoinfo.metadata.isVideo;

// If we know this is not a video, ignore it

if (isVideo === false) {

return;

}

// If we don't have metadata for this video yet, add it to the

// metadata queue to get processed. Once the metadata is

// available, it will be passed to addVideo()

if (isVideo === undefined) {

addToMetadataQueue(videoinfo);

return;

}

// If we've parsed the metadata and know this is a video, display it.

if (isVideo === true) {

batch.push(videoinfo);

if (batch.length >= batchSize) {

flush();

batchSize *= 2;

}

}

});

function flush() {

batch.forEach(addVideo);

batch.length = 0;

}

}

function addVideo(videodata) {

if (!videodata || !videodata.metadata.isVideo) {

return;

}

// Create the thumbnail view for this video and insert it at the right spot

var view = thumbnailList.addItem(videodata);

// thumbnailClickHandler is defined in video.js

view.addTapListener(thumbnailClickHandler);

// If we just added the first video we need to hide the "no video" overlay

if (thumbnailList.count === 1) {

updateDialog();

}

}

function videoCreated(videoinfo) {

// When MediaDB tells us about a new video, we add it to the queue for

// metadata parsing when we are able to do that.

addToMetadataQueue(videoinfo);

}

function videoDeleted(filename) {

// And remove its thumbnail from the document

thumbnailList.removeItem(filename);

// If we just deleted the last video we need to display the "no video" overlay

// and go back to thumbnail list view in case we were in thumbnail select view

if (thumbnailList.count === 0) {

updateDialog();

hideSelectView();

}

}