/// <summary>
/// Asynchronously loads the audio for the current phrase.
/// </summary>
/// <param name="smilReferenceID"></param>
private void GetPhraseAudio(PhraseConstructionKit phraseConstruction)
{
//Determine whether current phrase has changed (to determine whether the 'new' phrase
// should be started or resumed).
string currentSmilReference = String.Format("{0}#{1}", phraseConstruction.SmilPath,
phraseConstruction.SmilReferenceID);
_canResumePhrase = _canResumePhrase && ( currentSmilReference == _activeSmilReference );
_activeSmilReference = currentSmilReference;
//Extract SMIL object to get media file path, start & stop times.
XElement audioElement = _activeSmilDocument.GetAudioElementBySmilID(phraseConstruction.SmilReferenceID);
phraseConstruction.AudioElement = audioElement;
if(audioElement != null)
{
XAttribute audioSrc = audioElement.Attribute("src");
if(audioSrc != null)
{
string audioFilePath = audioSrc.Value;
audioFilePath = _mainState.BookFileSystem.CombinePath
(_mainState.CurrentBook.FolderPath.FullName, audioFilePath);
Logger.Log("OpenAsync Audio File {0}", audioFilePath);
//Need to coerce the expected file next to be received.
_currentRequestedFileUri = audioFilePath;
phraseConstruction.AudioFilePath = audioFilePath;
IFile currentFile = _mainState.BookFileSystem.GetFile(audioFilePath);
currentFile.OpenAsyncComplete += GetPhraseAudioComplete;
currentFile.OpenAsync(phraseConstruction);
}
}
else
{
if(PresentPhrase != null)
{
PresentPhrase(phraseConstruction.ConstructedPhrase, _canResumePhrase);
}
}
}
public void GetCurrentPhraseAsync(PlayerMode previousState)
{
_currentPhraseConstruction = new PhraseConstructionKit();
Phrase currentPhrase = _currentPhraseConstruction.ConstructedPhrase;
currentPhrase.Text = GetSpeakableText();
currentPhrase.ElementID = Navigator.CurrentElementID;
Book currentBook = _mainState.CurrentBook;
string bookPath = currentBook.FolderPath.FullName;
//Get SMIL path from book XML
string smilPath;
string smilReferenceID;
string currentSmilReference = GetCurrentSmilReference();
_canResumePhrase = previousState == PlayerMode.Paused;
//We've been given an element with no SMIL Reference, aka Unspeakable
//Since the navigation methods all only navigate speakable elements, this
//only results from clicking on an element on the surface
if(currentSmilReference == null)
{
XAttribute hasAltText = Navigator.CurrentElement.Attribute("alt");
if(hasAltText != null)
{
currentPhrase.Text = "Image. " + hasAltText.Value;
}
else
{
currentPhrase.Text = "......"; //Could be anything, but each character represents a fixed length of silence
currentPhrase.Silent = true;
}
if(PresentPhrase != null)
{
//Cannot resume - just speak.
PresentPhrase(currentPhrase, false);
}
return;
}
DeconstructSmilReference(currentSmilReference, out smilPath, out smilReferenceID);
smilPath = _mainState.BookFileSystem.CombinePath(bookPath, smilPath);
_currentPhraseConstruction.SmilPath = smilPath;
_currentPhraseConstruction.SmilReferenceID = smilReferenceID;
//Avoid repeat loading of previous SMIL document
SmilDocument currentSmilDocument = _activeSmilDocument;
if(currentSmilDocument == null || currentSmilDocument.SmilPath != smilPath)
{
//Need to coerce the expected file next to be received.
_currentRequestedFileUri = smilPath;
//Get corresponding SMIL file from file system
IFile smilFile = _mainState.BookFileSystem.GetFile(smilPath);
//Exception thrown if file doesn't exist.
//Stream smilStream = smilFile.Open(FileMode.Open, FileAccess.Read, FileShare.Read);
smilFile.OpenAsyncComplete += GetSmilFileComplete;
smilFile.OpenAsync(_currentPhraseConstruction);
}
else
{
GetPhraseAudio(_currentPhraseConstruction);
}
}