public long SeekTo(
long granulePos, int preRoll, GetPacketGranuleCountDelegate getPacketGranuleCount)
{
if (_reader == null)
{
throw new ObjectDisposedException(GetType().FullName);
}
int pageIndex = _reader.FindPage(granulePos);
int packetIndex;
if (granulePos == 0)
{
// for this, we can generically say the first packet on the first page having a non-zero granule
packetIndex = 0;
}
else
{
packetIndex = FindPacket(pageIndex, ref granulePos, getPacketGranuleCount);
packetIndex -= preRoll;
}
if (!NormalizePacketIndex(ref pageIndex, ref packetIndex))
{
throw new ArgumentOutOfRangeException(nameof(granulePos));
}
_lastPacket = null;
_pageIndex = pageIndex;
_packetIndex = packetIndex;
return(granulePos);
}
public long SeekTo(long granulePos, int preRoll, GetPacketGranuleCount getPacketGranuleCount)
{
if (_reader == null)
{
throw new ObjectDisposedException(nameof(PacketProvider));
}
int pageIndex;
int packetIndex;
if (granulePos == 0)
{
// for this, we can generically say the first packet on the first page having a non-zero granule
pageIndex = _reader.FirstDataPageIndex;
packetIndex = 0;
}
else
{
pageIndex = _reader.FindPage(granulePos);
if (_reader.HasAllPages && _reader.MaxGranulePosition == granulePos)
{
// allow seek to the offset immediatly after the last available (for what good it'll do)
_lastPacket = null;
_pageIndex = pageIndex;
_packetIndex = 0;
return(granulePos);
}
else
{
packetIndex = FindPacket(pageIndex, ref granulePos, getPacketGranuleCount);
}
packetIndex -= preRoll;
}
if (!NormalizePacketIndex(ref pageIndex, ref packetIndex))
{
throw new ArgumentOutOfRangeException(nameof(granulePos));
}
if (pageIndex < _reader.FirstDataPageIndex)
{
pageIndex = _reader.FirstDataPageIndex;
packetIndex = 0;
}
_lastPacket = null;
_pageIndex = pageIndex;
_packetIndex = packetIndex;
return(granulePos);
}