internal static LanguageItem Create(Section section, int offset, int length)
{
// Test for length
if (length < 4) return null;
// Create
return new LanguageItem(section, offset);
}
internal static TeletextItem Create(Section section, int offset, int length)
{
// Check
if (length < 5) return null;
// Create
return new TeletextItem(section, offset);
}
private LanguageItem(Section section, int offset)
{
// Load the string
ISOLanguage = section.ReadString(offset, 3);
// Load the effect
Effect = (AudioTypes)section[offset + 3];
}
/// <summary>
/// Create a duration representation from the <see cref="Section"/>
/// raw data.
/// </summary>
/// <remarks>
/// Please refer to the original document for the encoding algorithm used, e.g
/// e.g. <i>ETSI EN 300 468 V1.6.1 (2004-06)</i> or alternate versions.
/// </remarks>
/// <param name="section">The raw data holder.</param>
/// <param name="offset">The offset to the first of three bytes in
/// the raw data.</param>
/// <returns>The corresponding duration.</returns>
public static TimeSpan DecodeDuration(Section section, int offset)
{
// Read all parts
int d0 = FromBCD(section[offset + 0]);
int d1 = FromBCD(section[offset + 1]);
int d2 = FromBCD(section[offset + 2]);
// Calculate
return new TimeSpan(d0, d1, d2);
}
private TeletextItem(Section section, int offset)
{
// Load
ISOLanguage = section.ReadString(offset + 0, 3);
Type = (TeletextTypes)(section[offset + 3]>>3);
MagazineNumber = (byte)(section[offset + 3]&0x7);
// Decode
PageNumberBCD = section[offset + 4];
}
/// <summary>
/// Create a GMT/UTC time representation from the <see cref="Section"/>
/// raw data.
/// </summary>
/// <remarks>
/// Please refer to the original document for the encoding algorithm used, e.g
/// e.g. <i>ETSI EN 300 468 V1.6.1 (2004-06)</i> or alternate versions.
/// </remarks>
/// <param name="section">The raw data holder.</param>
/// <param name="offset">The offset to the first of five bytes in
/// the raw data.</param>
/// <returns>The corresponding GMT/UTC date and time.</returns>
public static DateTime DecodeTime(Section section, int offset)
{
// Read all parts
byte t0 = section[offset + 0];
byte t1 = section[offset + 1];
int t2 = FromBCD(section[offset + 2]);
int t3 = FromBCD(section[offset + 3]);
int t4 = FromBCD(section[offset + 4]);
// Calculate
return new DateTime(1970, 1, 1, t2, t3, t4).AddDays(MergeBytesToWord(t1, t0) - 40587);
}
/// <summary>
/// Erzeugt eine neue Beschreibung.
/// </summary>
/// <param name="section">Der SI Bereich, in dem die Information gefunden wurde.</param>
/// <param name="offset">Der Index des ersten Bytes dieser Information in den Rohdaten des SI Bereichs.</param>
/// <param name="length">Die Anzahl der Bytes für diese Information.</param>
/// <returns>Die zugehörige Information oder <i>null</i>, wenn eine Rekonstruktion nicht möglich war.</returns>
public static CellInformation Create( Section section, int offset, int length )
{
// Check minimum length
if (length < 10)
return null;
// Correct length
length -= 10;
// Read length of extension data
int extlen = section[offset + 9];
// Validate
if (extlen > length)
return null;
// Read direct data
ushort cellId = Tools.MergeBytesToWord( section[offset + 1], section[offset + 0] );
int latitude = Tools.MergeBytesToWord( section[offset + 3], section[offset + 2] );
int longitude = Tools.MergeBytesToWord( section[offset + 5], section[offset + 4] );
// Read to be merged data
int ext0 = section[offset + 6];
int ext1 = section[offset + 7];
int ext2 = section[offset + 8];
// Merge extends
int latitude_ext = (ext1 >> 4) + 16 * ext0;
int longitude_ext = ext2 + 256 * (ext1 & 0x0f);
// Create new
CellInformation info = new CellInformation
{
Length = 10 + extlen,
Identifier = cellId,
Latitude = Rescale(latitude, 16, 90),
Longitude = Rescale(longitude, 16, 180),
LatitudeExtension = Rescale(latitude_ext, 13, 90),
LongitudeExtension = Rescale(longitude_ext, 13, 180)
};
// Report
return info;
}
/// <summary>
/// Find the handler <see cref="Type"/> for a table identifier and create
/// a new instance of it.
/// <seealso cref="JMS.DVB.EPG.Section.TableIdentifier"/>
/// </summary>
/// <param name="section">The related <see cref="Section"/>.</param>
/// <returns>A new instance of the corresponding handler class. The <see cref="IsValid"/>
/// of the instance reports if the table is consistent and should be used.</returns>
static public Table Create( Section section )
{
// Attach to the type
Type pHandler = (Type) m_HandlerForIdentifier[section.TableIdentifier];
// Create
return (Table) Activator.CreateInstance( pHandler, new object[] { section } );
}
/// <summary>
/// Erzeugt eine neue Informationsinstanz.
/// </summary>
/// <param name="section">Die SI Tabelle, in der die Informationen abgelegt sind.</param>
/// <param name="offset">Das erste Byte, das Informationen zu Untertiteln enthält.</param>
private SubtitleInfo( Section section, int offset )
{
// Load the language
ISOLanguage = section.ReadString( offset, 3 );
// Load the type
Type = (SubtitleTypes) section[offset + 3];
// Load pages
CompositionPage = Tools.MergeBytesToWord( section[offset + 5], section[offset + 4] );
AncillaryPage = Tools.MergeBytesToWord( section[offset + 7], section[offset + 6] );
}
/// <summary>
/// Parse some EPG information and try to extract the data of the current
/// service group.
/// </summary>
/// <param name="section">Currently parsed SI table.</param>
private void EPGSectionFound(Section section)
{
// Test
Tables.EIT eit = section.Table as Tables.EIT;
// Not us
if ( null == eit ) return;
// Process all events
foreach ( EventEntry evt in eit.Entries )
{
// What to add
ArrayList ids = new ArrayList(), names = new ArrayList();
// Make sure that this is us
bool found = false;
// Run over
foreach ( Descriptor descr in evt.Descriptors )
{
// Check type
Descriptors.Linkage info = descr as Descriptors.Linkage;
if ( null == info ) continue;
// Check type (PREMIERE)
if ( 176 != info.LinkType ) continue;
// Create identifier
Identifier id = new Identifier(info.OriginalNetworkIdentifier, info.TransportStreamIdentifier, info.ServiceIdentifier);
// Try to locate the related station
Station real = DVBDevice.FindStation(id);
if ( null == real )
{
// Could be service channel
id = new Identifier(info.ServiceIdentifier, 0xffff, info.ServiceIdentifier);
real = DVBDevice.FindStation(id);
// Try again
if ( null == real ) continue;
}
// Check the first one
if ( !found ) found = Equals(id, CurrentPortal);
// Remember
names.Add(string.Format("{0},{1}", names.Count, CodePage.GetString(info.PrivateData)));
ids.Add(id);
}
// Register
if ( found )
lock (m_ServiceNames)
for ( int i = ids.Count ; i-- > 0 ; )
m_ServiceNames[ids[i]] = names[i];
}
}
/// <summary>
/// Create a GMT/UTC date representation from the <see cref="Section"/>
/// raw data.
/// </summary>
/// <remarks>
/// Please refer to the original document for the encoding algorithm used, e.g
/// e.g. <i>ETSI EN 300 468 V1.6.1 (2004-06)</i> or alternate versions.
/// </remarks>
/// <param name="section">The raw data holder.</param>
/// <param name="offset">The offset to the first of two bytes in
/// the raw data.</param>
/// <returns>The corresponding GMT/UTC date and.</returns>
static public DateTime DecodeDate( Section section, int offset )
{
// Read all parts
byte t0 = section[offset + 0];
byte t1 = section[offset + 1];
// Calculate
return new DateTime( 1970, 1, 1, 0, 0, 0 ).AddDays( MergeBytesToWord( t1, t0 ) - 40587 );
}
/// <summary>
/// Ermittelt aus der aktuellen <i>Program Map Table</i> die Informationen zum
/// Porgramm des eingehenden Transport Streams.
/// </summary>
/// <remarks>
/// Dabei wird das Bild- und das gewünschte Tonsignal ermittelt und in den Transport
/// Stream für den DirectShow Graphen übertragen. Dieser kann so mit festen PIDs
/// arbeiten, wodurch die weitere Handhabung im DVB.NET DirectShow Graphen vereinfacht wird.
/// Man kann die Arbeit dieser Methode daher als Auswahl der Tonspur und PID Mapping
/// beschreiben.
/// </remarks>
/// <param name="pmt">Eine SI Tabelle.</param>
private void ProcessPMT( Section pmt )
{
// Not active
if (!IsRunning)
return;
// Validate
if (!pmt.IsValid)
return;
// Attach to table
PMT table = pmt.Table as PMT;
// Validate
if (null == table)
return;
if (!table.IsValid)
return;
if (null == table.ProgramEntries)
return;
if (table.ProgramEntries.Length < 1)
return;
// Remember
m_CurrentService = table.ProgramNumber;
// All audio
List<AudioItem> audios = new List<AudioItem>();
// Video and audio
ushort video = 0, audio = 0, ttx = 0;
bool mpeg4 = false, ac3 = false;
// Process all programs
foreach (ProgramEntry program in table.ProgramEntries)
if ((program.StreamType == StreamTypes.Audio11172) || (program.StreamType == StreamTypes.Audio13818))
{
// Remember MP2
audios.Add( new AudioItem( program, false, audios.Count ) );
}
else if ((program.StreamType == StreamTypes.Video13818) || (program.StreamType == StreamTypes.H264))
{
// Only first video
if (0 != video)
continue;
// Remember
mpeg4 = (StreamTypes.H264 == program.StreamType);
video = program.ElementaryPID;
}
else if (program.StreamType == StreamTypes.PrivateData)
{
// Modes
bool ac3Found = false, ttxFound = false;
// Scan descriptors
foreach (Descriptor descriptor in program.Descriptors)
if (!ac3Found && (descriptor is AC3))
{
// Add to list
audios.Add( new AudioItem( program, true, audios.Count ) );
// Done
ac3Found = true;
}
else if (!ttxFound && (descriptor is Teletext))
{
// Remember
ttx = program.ElementaryPID;
// Done
ttxFound = true;
}
}
// Always update name list
m_AudioNames = audios.ConvertAll<string>( item => item.Name ).ToArray();
// Read the audio index
int audioIndex = AudioIndex;
// Reset to default
if ((audioIndex < 0) || (audioIndex >= audios.Count)) audioIndex = 0;
// Check result
if (audioIndex < audios.Count)
{
// Load item
AudioItem item = audios[AudioIndex];
// Copy all
audio = item.PID;
ac3 = item.AC3;
}
// Check changes
bool videoDecChanged = (mpeg4 != m_MPEG4) || m_RestartAV;
bool videoChanged = (video != m_Video) || m_RestartAV;
bool audioChanged = (audio != m_Audio) || m_RestartAV;
bool audioDecChanged = (ac3 != m_AC3) || m_RestartAV;
bool ttxChanged = (ttx != m_TTX) || m_RestartAV;
// No change at all
if (!videoChanged)
if (!videoDecChanged)
if (!audioChanged)
if (!audioDecChanged)
if (!ttxChanged)
return;
// Discard old
if (null != m_TSParser)
{
// De-register
if (videoChanged && (0 != m_Video))
m_TSParser.RemoveFilter( m_Video );
if (audioChanged && (0 != m_Audio))
m_TSParser.RemoveFilter( m_Audio );
if (ttxChanged && (0 != m_TTX))
m_TSParser.RemoveFilter( m_TTX );
}
// Check for enforcement
bool first = ((0 == m_Video) && (0 == m_Audio)) || m_RestartAV;
// Change
AudioIndex = audioIndex;
m_RestartAV = false;
m_Video = video;
m_Audio = audio;
m_MPEG4 = mpeg4;
m_AC3 = ac3;
m_TTX = ttx;
// Register new
if (null != m_TSParser)
{
// De-register
if (videoChanged && (0 != m_Video))
m_TSParser.SetFilter( m_Video, false, AddVideo );
if (audioChanged && (0 != m_Audio))
m_TSParser.SetFilter( m_Audio, false, AddAudio );
if (ttxChanged && (0 != m_TTX))
m_TSParser.SetFilter( m_TTX, false, m_TTXStream.AddPayload );
}
// Attach to client
var streamChanged = StreamChanged;
if (streamChanged != null)
streamChanged( first || videoDecChanged || audioDecChanged );
}
/// <summary>
/// Versucht, aus der aktuellen <i>Program Access Table</i> das Programm des
/// eingehenden Transport Streams zu ermitteln.
/// </summary>
/// <remarks>
/// Nur das erste Programm wird berücksichtigt.
/// </remarks>
/// <param name="pat">Eine SI Tabelle.</param>
private void ProcessPAT( Section pat )
{
// Not active
if (!IsRunning)
return;
// Validate
if (!pat.IsValid)
return;
// Attach to table
PAT table = pat.Table as PAT;
// Validate
if (null == table)
return;
if (!table.IsValid)
return;
if (null == table.ProgramIdentifier)
return;
// Get the first
IEnumerator<KeyValuePair<ushort, ushort>> programEnum = table.ProgramIdentifier.GetEnumerator();
if (!programEnum.MoveNext())
return;
// Compare current PMT
if (m_CurrentPMT == programEnum.Current.Value)
return;
// Remove the audio names
m_AudioNames = new string[0];
// Stop current PMT
if (0 != m_CurrentPMT)
m_TSParser.RemoveFilter( m_CurrentPMT );
// Re-create parser
m_PMTParser = new Parser();
// Connect to handler
m_PMTParser.SectionFound += ProcessPMT;
// Change
m_CurrentPMT = programEnum.Current.Value;
m_CurrentService = null;
CurrentEntry = null;
NextEntry = null;
// Create PMT
m_TSParser.SetFilter( m_CurrentPMT, true, m_PMTParser.OnData );
}
/// <summary>
/// Prüft, ob in der Programmzeitschrift Daten zur aktuellen Aufzeichnung vorliegen.
/// </summary>
/// <param name="section">Eintrag aus der Programmzeitschrift.</param>
private void ProcessEPG( Section section )
{
// Not valid
if (null == section)
return;
if (!section.IsValid)
return;
// Get the table
EIT eit = section.Table as EIT;
// Not valid
if (null == eit)
return;
if (!eit.IsValid)
return;
// See if filter is active
int? service = m_CurrentService;
// Only current events are of interest
if (!service.HasValue)
return;
if (service.Value != eit.ServiceIdentifier)
return;
// Set flags
bool gotCurrent = false, gotNext = false;
// Find all
foreach (EventEntry entry in eit.Entries)
{
// Check for current
if (!gotCurrent)
if (EventStatus.Running == entry.Status)
{
// Remember
CurrentEntry = entry;
gotCurrent = true;
// Done
if (gotNext)
break;
else
continue;
}
// Check for next
if (!gotNext)
if (EventStatus.NotRunning == entry.Status)
{
// Remember
NextEntry = entry;
gotNext = true;
// Done
if (gotCurrent)
break;
}
}
}
/// <summary>
/// Called for each section the driver parsed from the stream.
/// </summary>
/// <param name="section">Section parsed.</param>
protected override void OnSectionFound(Section section)
{
// We are already done
if (m_Complete.WaitOne(0, false)) return;
// Not useable
if ((null == section) || !section.IsValid) return;
// Be safe
try
{
// Nothing to do
if ((null == section.Table) || !section.Table.IsValid) return;
// Call implementation
if (OnTableFound(section.Table)) m_Complete.Set();
}
catch
{
// Ignore any error
}
}
/// <summary>
/// Fire <see cref="SectionFound"/>.
/// </summary>
/// <param name="section">A <see cref="Section"/> constructed from
/// the raw input stream.</param>
protected virtual void OnSectionFound(Section section)
{
// Load
SectionFoundHandler handler = SectionFound;
// Send
if (null != handler) handler(section);
}
/// <summary>
/// Erzeugt eine neue Informationsinstanz.
/// </summary>
/// <param name="section">Die SI Tabelle, in der die Informationen abgelegt sind.</param>
/// <param name="offset">Das erste Byte, das Informationen zu Untertiteln enthält.</param>
/// <param name="length">Die Anzahl der Bytes, die für die Beschreibung zur Verfügung stehen.</param>
/// <returns>Die Informationsinstanz oder <i>null</i>, wenn keine aus den Daten erstellt
/// werden konnte.</returns>
internal static SubtitleInfo Create( Section section, int offset, int length )
{
// Test for length
if (length < 8) return null;
// Create
return new SubtitleInfo( section, offset );
}
/// <summary>
/// Initialize the instance.
/// </summary>
/// <param name="section">The related <see cref="Section"/>.</param>
protected Table( Section section )
{
// Remember
m_Section = section;
// Direct load
Version = (section[2] >> 1) & 0x1f;
IsCurrent = (0 != (section[2] & 1));
SectionNumber = section[3];
LastSectionNumber = section[4];
}
private void SectionFound( Section section )
{
// Check
if ((null == section) || !section.IsValid) return;
// Test all
if (ProcessEITEvents( section.Table as EIT )) return;
if (ProcessCITEvents( section.Table as CITPremiere )) return;
}
