private void ReadHeader(EBMLElement element)
{
string doctype = null;
ulong i = 0;
while (i < element.DataSize)
{
EBMLElement child = new EBMLElement(this, element.DataOffset + i);
EBMLID ebml_id = (EBMLID)child.ID;
switch (ebml_id)
{
case EBMLID.EBMLDocType:
doctype = child.ReadString();
break;
default:
break;
}
i += child.Size;
}
// Check DocType
if (String.IsNullOrEmpty(doctype) || (doctype != "matroska" && doctype != "webm"))
{
throw new UnsupportedFormatException("DocType is not matroska or webm");
}
}
private void ReadSegment(EBMLElement element)
{
ulong i = 0;
while (i < element.DataSize)
{
EBMLElement child = new EBMLElement(this, element.DataOffset + i);
MatroskaID matroska_id = (MatroskaID)child.ID;
switch (matroska_id)
{
case MatroskaID.MatroskaTracks:
ReadTracks(child);
break;
case MatroskaID.MatroskaSegmentInfo:
ReadSegmentInfo(child);
break;
case MatroskaID.MatroskaTags:
ReadTags(child);
break;
case MatroskaID.MatroskaCluster:
// Get out of here when we reach the clusters for now.
return;
default:
break;
}
i += child.Size;
}
}
/// <summary>
/// Reads the file with a specified read style.
/// </summary>
/// <param name="propertiesStyle">
/// A <see cref="ReadStyle" /> value specifying at what level
/// of accuracy to read the media properties, or <see
/// cref="ReadStyle.None" /> to ignore the properties.
/// </param>
private void Read(ReadStyle propertiesStyle)
{
ulong offset = 0;
while (offset < (ulong)Length)
{
EBMLElement element = new EBMLElement(this, offset);
EBMLID ebml_id = (EBMLID)element.ID;
MatroskaID matroska_id = (MatroskaID)element.ID;
switch (ebml_id)
{
case EBMLID.EBMLHeader:
ReadHeader(element);
break;
default:
break;
}
switch (matroska_id)
{
case MatroskaID.MatroskaSegment:
ReadSegment(element);
break;
default:
break;
}
offset += element.Size;
}
}
/// <summary>
/// Constructs a <see cref="Track" /> parsing from provided
/// file data.
/// Parsing will be done reading from _file at position references by
/// parent element's data section.
/// </summary>
/// <param name="_file"><see cref="File" /> instance to read from.</param>
/// <param name="element">Parent <see cref="EBMLElement" />.</param>
public Track(File _file, EBMLElement element)
{
ulong i = 0;
while (i < element.DataSize)
{
EBMLElement child = new EBMLElement(_file, element.DataOffset + i);
MatroskaID matroska_id = (MatroskaID)child.ID;
switch (matroska_id)
{
case MatroskaID.MatroskaTrackNumber:
track_number = child.ReadUInt();
break;
case MatroskaID.MatroskaTrackUID:
track_uid = child.ReadUInt();
break;
case MatroskaID.MatroskaCodecID:
track_codec_id = child.ReadString();
break;
case MatroskaID.MatroskaCodecName:
track_codec_name = child.ReadString();
break;
case MatroskaID.MatroskaTrackName:
track_name = child.ReadString();
break;
case MatroskaID.MatroskaTrackLanguage:
track_language = child.ReadString();
break;
case MatroskaID.MatroskaTrackFlagEnabled:
track_enabled = child.ReadBool();
break;
case MatroskaID.MatroskaTrackFlagDefault:
track_default = child.ReadBool();
break;
case MatroskaID.MatroskaCodecPrivate:
codec_data = child.ReadBytes();
break;
default:
unknown_elems.Add(child);
break;
}
i += child.Size;
}
}
private void ReadSimpleTag(EBMLElement element)
{
ulong i = 0;
#pragma warning disable 219 // Assigned, never read
string tag_name = null, tag_language = null, tag_string = null;
#pragma warning restore 219
while (i < element.DataSize)
{
EBMLElement child = new EBMLElement(this, element.DataOffset + i);
MatroskaID matroska_id = (MatroskaID)child.ID;
switch (matroska_id)
{
case MatroskaID.MatroskaTagName:
tag_name = child.ReadString();
break;
case MatroskaID.MatroskaTagLanguage:
tag_language = child.ReadString();
break;
case MatroskaID.MatroskaTagString:
tag_string = child.ReadString();
break;
default:
break;
}
i += child.Size;
}
if (tag_name == "AUTHOR")
{
tag.Performers = new string [] { tag_string };
}
else if (tag_name == "TITLE")
{
tag.Title = tag_string;
}
else if (tag_name == "ALBUM")
{
tag.Album = tag_string;
}
else if (tag_name == "COMMENTS")
{
tag.Comment = tag_string;
}
}
private void ReadTrackEntry(EBMLElement element)
{
ulong i = 0;
while (i < element.DataSize)
{
EBMLElement child = new EBMLElement(this, element.DataOffset + i);
MatroskaID matroska_id = (MatroskaID)child.ID;
switch (matroska_id)
{
case MatroskaID.MatroskaTrackType: {
TrackType track_type = (TrackType)child.ReadUInt();
switch (track_type)
{
case TrackType.Video: {
VideoTrack track = new VideoTrack(this, element);
tracks.Add(track);
break;
}
case TrackType.Audio: {
AudioTrack track = new AudioTrack(this, element);
tracks.Add(track);
break;
}
case TrackType.Subtitle: {
SubtitleTrack track = new SubtitleTrack(this, element);
tracks.Add(track);
break;
}
default:
break;
}
break;
}
default:
break;
}
i += child.Size;
}
}
/// <summary>
/// Construct a <see cref="AudioTrack" /> reading information from
/// provided file data.
/// Parsing will be done reading from _file at position references by
/// parent element's data section.
/// </summary>
/// <param name="_file"><see cref="File" /> instance to read from.</param>
/// <param name="element">Parent <see cref="EBMLElement" />.</param>
public AudioTrack(File _file, EBMLElement element)
: base(_file, element)
{
MatroskaID matroska_id;
// Here we handle the unknown elements we know, and store the rest
foreach (EBMLElement elem in base.UnknownElements)
{
matroska_id = (MatroskaID)elem.ID;
if (matroska_id == MatroskaID.MatroskaTrackAudio)
{
ulong i = 0;
while (i < elem.DataSize)
{
EBMLElement child = new EBMLElement(_file, elem.DataOffset + i);
matroska_id = (MatroskaID)child.ID;
switch (matroska_id)
{
case MatroskaID.MatroskaAudioChannels:
channels = child.ReadUInt();
break;
case MatroskaID.MatroskaAudioBitDepth:
depth = child.ReadUInt();
break;
case MatroskaID.MatroskaAudioSamplingFreq:
rate = child.ReadDouble();
break;
default:
unknown_elems.Add(child);
break;
}
i += child.Size;
}
}
else
{
unknown_elems.Add(elem);
}
}
}
/// <summary>
/// Constructs a <see cref="SubtitleTrack" /> parsing from provided
/// file data.
/// Parsing will be done reading from _file at position references by
/// parent element's data section.
/// </summary>
/// <param name="_file"><see cref="File" /> instance to read from.</param>
/// <param name="element">Parent <see cref="EBMLElement" />.</param>
public SubtitleTrack(File _file, EBMLElement element)
: base(_file, element)
{
// Here we handle the unknown elements we know, and store the rest
foreach (EBMLElement elem in base.UnknownElements)
{
MatroskaID matroska_id = (MatroskaID)elem.ID;
switch (matroska_id)
{
default:
unknown_elems.Add(elem);
break;
}
}
}
private void ReadSegmentInfo(EBMLElement element)
{
ulong i = 0;
while (i < element.DataSize)
{
EBMLElement child = new EBMLElement(this, element.DataOffset + i);
MatroskaID matroska_id = (MatroskaID)child.ID;
switch (matroska_id)
{
case MatroskaID.MatroskaDuration:
duration_unscaled = (UInt64)child.ReadDouble();
if (time_scale > 0)
{
duration = TimeSpan.FromSeconds(duration_unscaled * time_scale / 1000000000);
}
break;
case MatroskaID.MatroskaTimeCodeScale:
time_scale = child.ReadUInt();
if (duration_unscaled > 0)
{
duration = TimeSpan.FromSeconds(duration_unscaled * time_scale / 1000000000);
}
break;
case MatroskaID.MatroskaTitle:
title = child.ReadString();
break;
default:
break;
}
i += child.Size;
}
}
private void ReadTracks(EBMLElement element)
{
ulong i = 0;
while (i < element.DataSize)
{
EBMLElement child = new EBMLElement(this, element.DataOffset + i);
MatroskaID matroska_id = (MatroskaID)child.ID;
switch (matroska_id)
{
case MatroskaID.MatroskaTrackEntry:
ReadTrackEntry(child);
break;
default:
break;
}
i += child.Size;
}
}
/// <summary>
/// Constructs a <see cref="VideoTrack" /> parsing from provided
/// file data.
/// Parsing will be done reading from _file at position references by
/// parent element's data section.
/// </summary>
/// <param name="_file"><see cref="File" /> instance to read from.</param>
/// <param name="element">Parent <see cref="EBMLElement" />.</param>
public VideoTrack(File _file, EBMLElement element)
: base(_file, element)
{
MatroskaID matroska_id;
// Here we handle the unknown elements we know, and store the rest
foreach (EBMLElement elem in base.UnknownElements)
{
matroska_id = (MatroskaID)elem.ID;
if (matroska_id == MatroskaID.MatroskaTrackVideo)
{
ulong i = 0;
while (i < elem.DataSize)
{
EBMLElement child = new EBMLElement(_file, elem.DataOffset + i);
matroska_id = (MatroskaID)child.ID;
switch (matroska_id)
{
case MatroskaID.MatroskaVideoDisplayWidth:
disp_width = child.ReadUInt();
break;
case MatroskaID.MatroskaVideoDisplayHeight:
disp_height = child.ReadUInt();
break;
case MatroskaID.MatroskaVideoPixelWidth:
width = child.ReadUInt();
break;
case MatroskaID.MatroskaVideoPixelHeight:
height = child.ReadUInt();
break;
case MatroskaID.MatroskaVideoFrameRate:
framerate = child.ReadDouble();
break;
case MatroskaID.MatroskaVideoFlagInterlaced:
interlaced = child.ReadBool();
break;
case MatroskaID.MatroskaVideoAspectRatioType:
ratio_type = (VideoAspectRatioType)child.ReadUInt();
break;
case MatroskaID.MatroskaVideoColourSpace:
fourcc = child.ReadBytes();
break;
default:
unknown_elems.Add(child);
break;
}
i += child.Size;
}
}
else if (matroska_id == MatroskaID.MatroskaTrackDefaultDuration)
{
uint tmp = elem.ReadUInt();
framerate = 1000000000.0 / (double)tmp;
}
else
{
unknown_elems.Add(elem);
}
}
}
