public int RaopBufferQueue(RaopBuffer raop_buffer, byte[] data, ushort datalen, Session session)
{
int encryptedlen;
RaopBufferEntry entry;
/* Check packet data length is valid */
if (datalen < 12 || datalen > RAOP_PACKET_LENGTH)
{
return(-1);
}
var seqnum = (ushort)((data[2] << 8) | data[3]);
if (datalen == 16 && data[12] == 0x0 && data[13] == 0x68 && data[14] == 0x34 && data[15] == 0x0)
{
return(0);
}
// Ignore, old
if (!raop_buffer.IsEmpty && seqnum < raop_buffer.FirstSeqNum && seqnum != 0)
{
return(0);
}
/* Check that there is always space in the buffer, otherwise flush */
if (raop_buffer.FirstSeqNum + RAOP_BUFFER_LENGTH < seqnum || seqnum == 0)
{
RaopBufferFlush(raop_buffer, seqnum);
}
entry = raop_buffer.Entries[seqnum % RAOP_BUFFER_LENGTH];
if (entry.Available && entry.SeqNum == seqnum)
{
/* Packet resent, we can safely ignore */
return(0);
}
entry.Flags = data[0];
entry.Type = data[1];
entry.SeqNum = seqnum;
entry.TimeStamp = (uint)((data[4] << 24) | (data[5] << 16) | (data[6] << 8) | data[7]);
entry.SSrc = (uint)((data[8] << 24) | (data[9] << 16) | (data[10] << 8) | data[11]);
entry.Available = true;
int payloadsize = datalen - 12;
var raw = new byte[payloadsize];
encryptedlen = payloadsize / 16 * 16;
if (encryptedlen > 0)
{
_aesCbcDecrypt.ProcessBytes(data, 12, encryptedlen, data, 12);
Array.Copy(data, 12, raw, 0, encryptedlen);
}
Array.Copy(data, 12 + encryptedlen, raw, encryptedlen, payloadsize - encryptedlen);
#if DUMP
/* RAW -> DUMP */
var fPath = Path.Combine(_dConfig.Path, "frames/");
File.WriteAllBytes($"{fPath}raw_{seqnum}", raw);
#endif
/* RAW -> PCM */
var length = _decoder.GetOutputStreamLength();
var output = new byte[length];
var res = _decoder.DecodeFrame(raw, ref output, length);
if (res != 0)
{
output = new byte[length];
Console.WriteLine($"Decoding error. Decoder: {_decoder.Type} Code: {res}");
}
#if DUMP
var pPath = Path.Combine(_dConfig.Path, "pcm/");
Console.WriteLine($"RES: {res}");
Console.WriteLine($"PCM: {output.Length}");
Console.WriteLine($"LNG: {length}");
File.WriteAllBytes($"{pPath}raw_{seqnum}", output);
#endif
Array.Copy(output, 0, entry.AudioBuffer, 0, output.Length);
entry.AudioBufferLen = output.Length;
/* Update the raop_buffer seqnums */
if (raop_buffer.IsEmpty)
{
raop_buffer.FirstSeqNum = seqnum;
raop_buffer.LastSeqNum = seqnum;
raop_buffer.IsEmpty = false;
}
if (raop_buffer.LastSeqNum < seqnum)
{
raop_buffer.LastSeqNum = seqnum;
}
// Update entries
raop_buffer.Entries[seqnum % RAOP_BUFFER_LENGTH] = entry;
return(1);
}