public void Flush(Stream stream)
{
int paketPos = 0;
var dataLen = _packets.Sum(p => p.PacketData.Length);
while (_packets.Count > 0)
{
int segmentsCount = Math.Max((dataLen / 255) + 1, _packets.Count);
int segmentPerPage = segmentsCount > 255 ? 255 : segmentsCount;
var oggsHeader = new OggsHeader(PageNo, SerialNo, CreateSegmentalTable(segmentPerPage),
_packets[0].Granulepos, paketPos != 0, Bos == 0,
Eos && segmentPerPage == segmentsCount);
Bos = 1;
PageNo++;
// set pointers in the ogg_page struct
var og = new Page
{
header = oggsHeader,
header_len = oggsHeader.Data.Length,
body_len = oggsHeader.SegmentTableSum
};
og.body = new byte[og.body_len];
int saved = 0;
while (saved < og.body_len)
{
var savingPaket = _packets.First();
var copyLen = Math.Min(og.body_len - saved, savingPaket.PacketData.Length);
Array.Copy(savingPaket.PacketData, paketPos, og.body, saved, copyLen);
dataLen -= copyLen;
if (copyLen == savingPaket.PacketData.Length)
{
_packets.Remove(savingPaket);
}
else
{
#if DEBUG
if (saved + copyLen != og.body_len)
{
throw new ArithmeticException();
}
#endif
paketPos = savingPaket.PacketData.Length - copyLen;
}
saved += copyLen;
og.header.GranulePosition = savingPaket.Granulepos;
}
ogg_page_checksum_set(og);
og.Write(stream);
}
_totalBits = 0;
}
private void SetPageCheckSum(Page og)
{
UInt32 crcReg = 0;
/* safety; needed for API behavior, but not framing code */
og.Header.CrcChecksum = 0;
for (int i = 0; i < og.HeaderLen; i++)
{
crcReg = (crcReg << 8) ^ _crcLookup[((crcReg >> 24) & 0xff) ^ og.Header.Data[i]];
}
for (int i = 0; i < og.BodyLen; i++)
{
crcReg = (crcReg << 8) ^ _crcLookup[((crcReg >> 24) & 0xff) ^ og.Body[i]];
}
og.Header.CrcChecksum = crcReg;
}
private Page GetPage(ref int unsavedPaketIndex)
{
int savedPacketCount;
int unsavedCount;
var table = CreateSegmentalTable(unsavedPaketIndex, out savedPacketCount, out unsavedCount);
var oggsHeader = new OggsHeader(_pageNo, SerialNo, table, _packets[savedPacketCount - 1].GranulePos,
unsavedPaketIndex != 0, _bos == 0, Eos && savedPacketCount == _packets.Count);
_bos = 1;
_pageNo++;
//set pointers in the ogg_page struct
var og = new Page
{
Header = oggsHeader,
HeaderLen = oggsHeader.Data.Length,
BodyLen = oggsHeader.SegmentTableSum,
Body = new byte[oggsHeader.SegmentTableSum]
};
int saved = 0;
var savingPaket = _packets.FirstOrDefault();
foreach (var count in table)
{
Array.Copy(savingPaket.PacketData, unsavedPaketIndex, og.Body, saved, count);
saved += count;
if (count == savingPaket.PacketDataLength - unsavedPaketIndex)
{
_packets.Remove(savingPaket);
unsavedPaketIndex = 0;
savedPacketCount--;
savingPaket = _packets.FirstOrDefault();
}
else
{
unsavedPaketIndex += count;
}
_totalBits -= count;
}
SetPageCheckSum(og);
return og;
}
private void ogg_page_checksum_set(Page og)
{
UInt32 crcReg = 0;
/* safety; needed for API behavior, but not framing code */
og.header.CrcChecksum = 0;
for (int i = 0; i < og.header_len; i++)
{
crcReg = (crcReg << 8) ^ Presets.Presets.CrcLookup[((crcReg >> 24) & 0xff) ^ og.header.Data[i]];
}
for (int i = 0; i < og.body_len; i++)
{
crcReg = (crcReg << 8) ^ Presets.Presets.CrcLookup[((crcReg >> 24) & 0xff) ^ og.body[i]];
}
og.header.CrcChecksum = crcReg;
}
