public DescriptorBase(byte[] data, int offset)
{
_DescTag = (DescriptorTag)data[0 + offset];
_Data = new byte[data[offset + 1]];
Array.Copy(data, offset + 2, _Data, 0, _Data.Length);
}
/// <summary>
/// Initializes a new instance of the <see cref="Descriptor"/> class.
/// </summary>
/// <param name="headerSize">Size of the descriptor header.</param>
/// <param name="payloadSize">Size of the descriptor body.</param>
/// <param name="tag">The descriptor tag.</param>
public Descriptor(uint headerSize, uint payloadSize, DescriptorTag tag)
{
this.HeaderSize = headerSize;
this.PayloadSize = payloadSize;
this.Tag = tag;
this.SubDescriptors = new List <Descriptor>();
}
/// <summary>
/// Instantiiert einen Descriptor abhängig vom Inhalt.
/// </summary>
/// <param name="data">Descriptor-Daten</param>
/// <param name="offset">Offset im Quellarray</param>
/// <returns>Descriptor anhand des Inhalts</returns>
public static DescriptorBase CreateDescriptor(byte[] data, int offset)
{
DescriptorTag tag = (DescriptorTag)data[offset];
switch (tag)
{
case DescriptorTag.ConditionalAccess:
return(new CaDescriptor(data, offset));
// TODO: bei Bedarf weitere Descriptoren hier einfügen
default:
return(new DescriptorBase(data, offset));
}
}
/// <summary>
/// Constructs and initializes a new instance of <see
/// cref="AppleElementaryStreamDescriptor" /> with a provided
/// header and handler by reading the contents from a
/// specified file.
/// </summary>
/// <param name="header">
/// A <see cref="BoxHeader" /> object containing the header
/// to use for the new instance.
/// </param>
/// <param name="file">
/// A <see cref="TagLib.File" /> object to read the contents
/// of the box from.
/// </param>
/// <param name="handler">
/// A <see cref="IsoHandlerBox" /> object containing the
/// handler that applies to the new instance.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="file" /> is <see langword="null" />.
/// </exception>
/// <exception cref="CorruptFileException">
/// Valid data could not be read.
/// </exception>
public AppleElementaryStreamDescriptor(BoxHeader header,
TagLib.File file,
IsoHandlerBox handler)
: base(header, file, handler)
{
/* ES_Descriptor Specifications
* Section 7.2.6.5 http://ecee.colorado.edu/~ecen5653/ecen5653/papers/ISO%2014496-1%202004.PDF
*/
ByteVector box_data = file.ReadBlock(DataSize);
decoder_config = new ByteVector();
int offset = 0;
// Elementary Stream Descriptor Tag
if ((DescriptorTag)box_data[offset++] != DescriptorTag.ES_DescrTag)
{
throw new CorruptFileException("Invalid Elementary Stream Descriptor, missing tag.");
}
// We have a descriptor tag. Check that the remainder of the tag is at least [Base (3 bytes) + DecoderConfigDescriptor (15 bytes) + SLConfigDescriptor (3 bytes) + OtherDescriptors] bytes long
uint es_length = ReadLength(box_data, ref offset);
uint min_es_length = 3 + 15 + 3; // Base minimum length
if (es_length < min_es_length)
{
throw new CorruptFileException("Insufficient data present.");
}
es_id = box_data.Mid(offset, 2).ToUShort();
offset += 2; // Done with ES_ID
stream_dependence_flag = ((byte)((box_data[offset] >> 7) & 0x1) == 0x1 ? true : false); // 1st bit
URL_flag = ((byte)((box_data[offset] >> 6) & 0x1) == 0x1 ? true : false); // 2nd bit
ocr_stream_flag = ((byte)((box_data[offset] >> 5) & 0x1) == 0x1 ? true : false); // 3rd bit
stream_priority = (byte)(box_data[offset++] & 0x1F); // Last 5 bits and we're done with this byte
if (stream_dependence_flag)
{
min_es_length += 2; // We need 2 more bytes
if (es_length < min_es_length)
{
throw new CorruptFileException("Insufficient data present.");
}
dependsOn_ES_ID = box_data.Mid(offset, 2).ToUShort();
offset += 2; // Done with stream dependence
}
if (URL_flag)
{
min_es_length += 2; // We need 1 more byte
if (es_length < min_es_length)
{
throw new CorruptFileException("Insufficient data present.");
}
URLlength = box_data[offset++]; // URL Length
min_es_length += URLlength; // We need URLength more bytes
if (es_length < min_es_length)
{
throw new CorruptFileException("Insufficient data present.");
}
URLstring = box_data.Mid(offset, URLlength).ToString(); // URL name
offset += URLlength; // Done with URL name
}
if (ocr_stream_flag)
{
min_es_length += 2; // We need 2 more bytes
if (es_length < min_es_length)
{
throw new CorruptFileException("Insufficient data present.");
}
OCR_ES_Id = box_data.Mid(offset, 2).ToUShort();
offset += 2; // Done with OCR
}
while (offset < DataSize) // Loop through all trailing Descriptors Tags
{
DescriptorTag tag = (DescriptorTag)box_data[offset++];
switch (tag)
{
case DescriptorTag.DecoderConfigDescrTag: // DecoderConfigDescriptor
{
// Check that the remainder of the tag is at least 13 bytes long (13 + DecoderSpecificInfo[] + profileLevelIndicationIndexDescriptor[])
if (ReadLength(box_data, ref offset) < 13)
{
throw new CorruptFileException("Could not read data. Too small.");
}
// Read a lot of good info.
object_type_id = box_data[offset++];
stream_type = (byte)(box_data[offset] >> 2); // First 6 bits
upStream = ((byte)((box_data[offset++] >> 1) & 0x1) == 0x1 ? true : false); // 7th bit and we're done with the stream bits
buffer_size_db = box_data.Mid(offset, 3).ToUInt();
offset += 3; // Done with bufferSizeDB
max_bitrate = box_data.Mid(offset, 4).ToUInt();
offset += 4; // Done with maxBitrate
average_bitrate = box_data.Mid(offset, 4).ToUInt();
offset += 4; // Done with avgBitrate
// If there's a DecoderSpecificInfo[] array at the end it'll pick it up in the while loop
}
break;
case DescriptorTag.DecSpecificInfoTag: // DecoderSpecificInfo
{
// The rest of the info is decoder specific.
uint length = ReadLength(box_data, ref offset);
decoder_config = box_data.Mid(offset, (int)length);
offset += (int)length; // We're done with the config
}
break;
case DescriptorTag.SLConfigDescrTag: // SLConfigDescriptor
{
// The rest of the info is SL specific.
uint length = ReadLength(box_data, ref offset);
offset += (int)length; // Skip the rest of the descriptor as reported in the length so we can move onto the next one
}
break;
case DescriptorTag.Forbidden_00:
case DescriptorTag.Forbidden_FF:
throw new CorruptFileException("Invalid Descriptor tag.");
default:
{
/* TODO: Should we handle other optional descriptor tags?
* ExtensionDescriptor extDescr[0 .. 255];
* LanguageDescriptor langDescr[0 .. 1];
* IPI_DescPointer ipiPtr[0 .. 1];
* IP_IdentificationDataSet ipIDS[0 .. 1];
* QoS_Descriptor qosDescr[0 .. 1];
*/
uint length = ReadLength(box_data, ref offset); // Every descriptor starts with a length
offset += (int)length; // Skip the rest of the descriptor as reported in the length so we can move onto the next one
break;
}
}
}
}
public DescriptorBase(DescriptorTag tag)
{
_DescTag = tag;
}
public void ShowDescriptor(string title, DescriptorTag tags, string description, int cost = 0)
{
descriptor.Init(title, tags, description, cost);
descriptorSwitcher.SwitchOn(descriptorTime);
}
