public static async Task <SampleDescriptionBox> CreateAsync(IBinaryStream stream, Box box)
{
var stsdBox = new SampleDescriptionBox();
stream.Position = box.Offset + 8;
stsdBox.Version = await stream.ReadByteAsync().ConfigureAwait(false);
stsdBox.Flags = await stream.ReadInt32Async(3, ByteOrder.BigEndian).ConfigureAwait(false);
var entriesAmount = await stream.ReadInt32Async(ByteOrder.BigEndian).ConfigureAwait(false);
for (var i = 0; i < entriesAmount; i++)
{
var sampleDescriptionSize = await stream.ReadUInt32Async(ByteOrder.BigEndian).ConfigureAwait(false);
var dataFormat = await stream.ReadStringAsync(4).ConfigureAwait(false);
stream.Position += 6;
var dataReferenceIndex = await stream.ReadUInt16Async(ByteOrder.BigEndian).ConfigureAwait(false);
stsdBox.Table.Add(new TableEntry(sampleDescriptionSize, dataFormat, dataReferenceIndex));
/*var version = await stream.ReadUInt16Async(ByteOrder.BigEndian).ConfigureAwait(false);
* var revision = await stream.ReadUInt16Async(ByteOrder.BigEndian).ConfigureAwait(false);
* var vendor = await stream.ReadUInt32Async(ByteOrder.BigEndian).ConfigureAwait(false);
* var channels = await stream.ReadUInt16Async(ByteOrder.BigEndian).ConfigureAwait(false);
* var sampleSize = await stream.ReadUInt16Async(ByteOrder.BigEndian).ConfigureAwait(false);
* var compressionId = await stream.ReadUInt16Async(ByteOrder.BigEndian).ConfigureAwait(false);
* var packetSize = await stream.ReadUInt16Async(ByteOrder.BigEndian).ConfigureAwait(false);
* var sampleRate = await stream.ReadUInt16Async(ByteOrder.BigEndian).ConfigureAwait(false);*/
}
return(stsdBox);
}
internal static async Task <Box> ReadBoxAsync(IBinaryStream stream, UInt32 maxPosition)
{
var boxes = new List <Box>();
var offset = stream.Position;
var length = await stream.ReadUInt32Async(ByteOrder.BigEndian).ConfigureAwait(false);
if ((length < 8) || (stream.Position + length - 4 > maxPosition))
{
return(null);
}
var name = await stream.ReadStringAsync(4).ConfigureAwait(false);
if (name == "meta")
{
var version = await stream.ReadByteAsync().ConfigureAwait(false);
var flags = await stream.ReadInt32Async(3, ByteOrder.BigEndian).ConfigureAwait(false);
}
var thisBoxMaxPosition = offset + length;
while (stream.Position < thisBoxMaxPosition)
{
var box = await ReadBoxAsync(stream, thisBoxMaxPosition).ConfigureAwait(false);
if (box == null)
{
boxes.Clear();
stream.Position = thisBoxMaxPosition;
break;
}
boxes.Add(box);
}
return(new Box(offset, length, name, boxes));
}
public static async Task <ParseResult <Mpeg4File> > ParseAsync(IBinaryStream stream, ParseOptions options)
{
try
{
stream.Position = 4;
if (await stream.ReadStringAsync(4) != "ftyp")
{
return(ParseResult <Mpeg4File> .CreateUnknownFormat());
}
var file = new Mpeg4File();
stream.Position = 0;
var streamLength = await stream.GetLengthAsync().ConfigureAwait(false);
while (stream.Position < streamLength)
{
file.Boxes.Add(await Mpeg4File.ReadBoxAsync(stream, await stream.GetLengthAsync().ConfigureAwait(false)));
}
if (options == ParseOptions.Metadata)
{
var mediaData = file.Contains("mdat") ? file["mdat"] : null;
var metadataItems = file.Contains("moov.udta.meta.ilst") ? await MetadataItemsBox.CreateAsync(stream, file["moov.udta.meta.ilst"]).ConfigureAwait(false) : null;
var mediaHeader = file.Contains("moov.trak.mdia.mdhd") ? await MediaHeaderBox.CreateAsync(stream, file["moov.trak.mdia.mdhd"]).ConfigureAwait(false) : null;
file.Metadata = new Mpeg4Metadata(metadataItems?.Cover, mediaHeader?.Duration, mediaHeader?.TimeScale, mediaData?.Length);
}
return(ParseResult <Mpeg4File> .Create(file));
}
catch (Exception exception)
{
return(ParseResult <Mpeg4File> .Create(exception));
}
}
public static async Task <Id3v2> ParseAsync(IBinaryStream stream)
{
stream.Position += 3;
var id3v2 = new Id3v2();
var majorVersion = await stream.ReadByteAsync().ConfigureAwait(false);
var revision = await stream.ReadByteAsync().ConfigureAwait(false);
var flags = await stream.ReadByteAsync().ConfigureAwait(false);
var size = Id3v2.DecodeSize(await stream.ReadUInt32Async(ByteOrder.BigEndian).ConfigureAwait(false));
var endingPosition = stream.Position + size;
while (stream.Position < endingPosition)
{
var frameId = await stream.ReadStringAsync(4).ConfigureAwait(false);
if (!Id3v2.IsValidAlphaNumeric(frameId))
{
stream.Position = endingPosition;
break;
}
var frameSize = 0U;
switch (majorVersion)
{
case 4:
frameSize = Id3v2.DecodeSize(await stream.ReadUInt32Async(ByteOrder.BigEndian).ConfigureAwait(false));
break;
case 3:
frameSize = await stream.ReadUInt32Async(ByteOrder.BigEndian).ConfigureAwait(false);
break;
default:
throw new NotSupportedException();
}
var frameFlags = await stream.ReadUInt16Async(ByteOrder.LittleEndian).ConfigureAwait(false);
switch (frameId)
{
case "TIT2":
id3v2.Title = Id3v2.DecodeString(await stream.ReadAsync(frameSize).ConfigureAwait(false));
break;
case "TALB":
id3v2.Album = Id3v2.DecodeString(await stream.ReadAsync(frameSize).ConfigureAwait(false));
break;
case "TOAL":
break;
case "TPE1":
id3v2.Artist = Id3v2.DecodeString(await stream.ReadAsync(frameSize).ConfigureAwait(false));
break;
case "TPE2":
id3v2.AlbumArtist = Id3v2.DecodeString(await stream.ReadAsync(frameSize).ConfigureAwait(false));
break;
case "TRCK":
var track = Id3v2.DecodeString(await stream.ReadAsync(frameSize).ConfigureAwait(false));
if (track != null)
{
id3v2.Track = ParseTrack(track);
}
break;
case "TYER":
var year = Id3v2.DecodeString(await stream.ReadAsync(frameSize).ConfigureAwait(false));
if (year != null)
{
id3v2.Year = ParseYear(year);
}
break;
case "APIC":
var readBytes = 0U;
var encoding = (FrameEncoding)await stream.ReadByteAsync().ConfigureAwait(false);
readBytes++;
while (await stream.ReadByteAsync().ConfigureAwait(false) != 0) // MIME type <text string> $00
{
readBytes++;
}
readBytes++;
var pictureType = await stream.ReadByteAsync().ConfigureAwait(false);
readBytes++;
while (await stream.ReadByteAsync().ConfigureAwait(false) != 0) // <text string according to encoding> $00 (00)
{
readBytes++;
}
id3v2.Cover = new DataLocation(stream.Position, frameSize - readBytes - 1);
stream.Position += frameSize - readBytes - 1;
break;
case "TCON":
case "COMM":
default:
stream.Position += frameSize;
break;
}
}
return(id3v2);
}
