private float[][] DecodeNextPacket(out int packetStartindex, out int packetValidLength, out int packetTotalLength, out bool isEndOfStream, out long?samplePosition, out int bitsRead, out int bitsRemaining, out int containerOverheadBits)
{
IPacket packet = null;
try
{
if ((packet = _packetProvider.GetNextPacket()) == null)
{
// no packet? we're at the end of the stream
isEndOfStream = true;
}
else
{
// if the packet is flagged as the end of the stream, we can safely mark _eosFound
isEndOfStream = packet.IsEndOfStream;
// resync... that means we've probably lost some data; pick up a new position
if (packet.IsResync)
{
_hasPosition = false;
}
// grab the container overhead now, since the read won't affect it
containerOverheadBits = packet.ContainerOverheadBits;
// make sure the packet starts with a 0 bit as per the spec
if (packet.ReadBit())
{
bitsRemaining = packet.BitsRemaining + 1;
}
else
{
// if we get here, we should have a good packet; decode it and add it to the buffer
var mode = _modes[(int)packet.ReadBits(_modeFieldBits)];
if (_nextPacketBuf == null)
{
_nextPacketBuf = new float[_channels][];
for (var i = 0; i < _channels; i++)
{
_nextPacketBuf[i] = new float[_block1Size];
}
}
if (mode.Decode(packet, _nextPacketBuf, out packetStartindex, out packetValidLength, out packetTotalLength))
{
// per the spec, do not decode more samples than the last granulePosition
samplePosition = packet.GranulePosition;
bitsRead = packet.BitsRead;
bitsRemaining = packet.BitsRemaining;
return(_nextPacketBuf);
}
bitsRemaining = packet.BitsRead + packet.BitsRemaining;
}
}
packetStartindex = 0;
packetValidLength = 0;
packetTotalLength = 0;
samplePosition = null;
bitsRead = 0;
bitsRemaining = 0;
containerOverheadBits = 0;
return(null);
}
finally
{
packet?.Done();
}
}