public override TSStream Clone()
{
TSAudioStream stream = new TSAudioStream();
CopyTo(stream);
stream.SampleRate = SampleRate;
stream.ChannelLayout = ChannelLayout;
stream.ChannelCount = ChannelCount;
stream.BitDepth = BitDepth;
stream.LFE = LFE;
stream.DialNorm = DialNorm;
stream.AudioMode = AudioMode;
if (CoreStream != null)
{
stream.CoreStream = (TSAudioStream)CoreStream.Clone();
}
return(stream);
}
public void Scan(TSAudioStream stream, TSStreamBuffer buffer, ref string tag, long?bitrate)
{
if (stream.IsInitialized)
{
return;
}
var sync = buffer.ReadBytes(2);
if (sync == null || sync[0] != 0x0B || sync[1] != 0x77)
{
return;
}
var secondFrame = stream.ChannelCount > 0;
uint srCode;
uint frameSize = 0;
uint frameSizeCode = 0;
uint channelMode;
uint lfeOn;
uint dialNorm = 0;
uint dialNormExt = 0;
uint numBlocks = 0;
var hdr = buffer.ReadBytes(4);
var bsid = (uint)((hdr[3] & 0xF8) >> 3);
buffer.Seek(-4, SeekOrigin.Current);
if (bsid <= 10)
{
buffer.BSSkipBytes(2);
srCode = buffer.ReadBits2(2);
frameSizeCode = buffer.ReadBits2(6);
bsid = buffer.ReadBits2(5);
buffer.BSSkipBits(3);
channelMode = buffer.ReadBits2(3);
if ((channelMode & 0x1) > 0 && channelMode != 0x1)
{
buffer.BSSkipBits(2);
}
if ((channelMode & 0x4) > 0)
{
buffer.BSSkipBits(2);
}
if (channelMode == 0x2)
{
var dsurmod = buffer.ReadBits2(2);
if (dsurmod == 0x2)
{
stream.AudioMode = TSAudioMode.Surround;
}
}
lfeOn = buffer.ReadBits2(1);
dialNorm = buffer.ReadBits2(5);
if (buffer.ReadBool())
{
buffer.BSSkipBits(8);
}
if (buffer.ReadBool())
{
buffer.BSSkipBits(8);
}
if (buffer.ReadBool())
{
buffer.BSSkipBits(7);
}
if (channelMode == 0)
{
buffer.BSSkipBits(5);
if (buffer.ReadBool())
{
buffer.BSSkipBits(8);
}
if (buffer.ReadBool())
{
buffer.BSSkipBits(8);
}
if (buffer.ReadBool())
{
buffer.BSSkipBits(7);
}
}
buffer.BSSkipBits(2);
if (bsid == 6)
{
if (buffer.ReadBool())
{
buffer.BSSkipBits(14);
}
if (buffer.ReadBool())
{
uint dsurexmod = buffer.ReadBits2(2);
uint dheadphonmod = buffer.ReadBits2(2);
if (dheadphonmod == 0x2)
{
// TODO
}
buffer.BSSkipBits(10);
if (dsurexmod == 2)
{
stream.AudioMode = TSAudioMode.Extended;
}
}
}
}
else
{
uint frameType = buffer.ReadBits2(2);
buffer.BSSkipBits(3);
frameSize = (buffer.ReadBits4(11) + 1) << 1;
srCode = buffer.ReadBits2(2);
if (srCode == 3)
{
srCode = buffer.ReadBits2(2);
numBlocks = 3;
}
else
{
numBlocks = buffer.ReadBits2(2);
}
channelMode = buffer.ReadBits2(3);
lfeOn = buffer.ReadBits2(1);
bsid = buffer.ReadBits2(5);
dialNormExt = buffer.ReadBits2(5);
if (buffer.ReadBool())
{
buffer.BSSkipBits(8);
}
if (channelMode == 0) // 1+1
{
buffer.BSSkipBits(5);
if (buffer.ReadBool())
{
buffer.BSSkipBits(8);
}
}
if (frameType == 1) //dependent stream
{
stream.CoreStream = (TSAudioStream)stream.Clone();
stream.CoreStream.StreamType = TSStreamType.AC3_AUDIO;
if (buffer.ReadBool()) //channel remapping
{
var chanmap = buffer.ReadBits4(16);
stream.ChannelCount = stream.CoreStream.ChannelCount;
stream.ChannelCount += AC3ChanMap((int)chanmap);
lfeOn = (uint)stream.CoreStream.LFE;
}
}
var emdfFound = false;
do
{
var emdfSync = buffer.ReadBits4(16);
if (emdfSync == 0x5838)
{
emdfFound = true;
break;
}
buffer.Seek(-2, SeekOrigin.Current);
buffer.BSSkipBits(1); // skip 1 bit
} while (buffer.Position < buffer.Length);
if (emdfFound)
{
var emdfContainerSize = buffer.ReadBits4(16);
var remainAfterEmdf = buffer.DataBitStreamRemain() - emdfContainerSize * 8;
uint emdfVersion = buffer.ReadBits2(2); //emdf_version
if (emdfVersion == 3)
{
emdfVersion += buffer.ReadBits2(2);
}
if (emdfVersion > 0)
{
buffer.BSSkipBits((int)(buffer.DataBitStreamRemain() - remainAfterEmdf));
}
else
{
var temp = buffer.ReadBits2(3);
if (temp == 0x7)
{
buffer.BSSkipBits(2); //skip 3 bits
}
var emdfPayloadID = buffer.ReadBits2(5);
if (emdfPayloadID > 0 && emdfPayloadID < 16)
{
if (emdfPayloadID == 0x1F)
{
buffer.BSSkipBits(5); //skip 5 bits
}
EmdfPayloadConfig(buffer);
var emdfPayloadSize = buffer.ReadBits2(8) * 8;
buffer.BSSkipBits(emdfPayloadSize + 1);
}
while ((emdfPayloadID = buffer.ReadBits2(5)) != 14 && buffer.Position < buffer.Length)
{
if (emdfPayloadID == 0x1F)
{
buffer.BSSkipBits(5); //skip 5 bits
}
EmdfPayloadConfig(buffer);
var emdfPayloadSize = buffer.ReadBits2(8) * 8;
buffer.ReadBits4(emdfPayloadSize + 1);
}
if (buffer.Position < buffer.Length && emdfPayloadID == 14)
{
EmdfPayloadConfig(buffer);
buffer.BSSkipBits(12);
uint jocNumObjectsBits = buffer.ReadBits2(6);
if (jocNumObjectsBits > 0)
{
stream.HasExtensions = true;
}
}
}
}
}
if (channelMode < 8 && stream.ChannelCount == 0)
{
stream.ChannelCount = AC3Channels[channelMode];
}
if (stream.AudioMode == TSAudioMode.Unknown)
{
switch (channelMode)
{
case 0: // 1+1
stream.AudioMode = TSAudioMode.DualMono;
break;
case 2: // 2/0
stream.AudioMode = TSAudioMode.Stereo;
break;
default:
stream.AudioMode = TSAudioMode.Unknown;
break;
}
}
switch (srCode)
{
case 0:
stream.SampleRate = 48000;
break;
case 1:
stream.SampleRate = 44100;
break;
case 2:
stream.SampleRate = 32000;
break;
default:
stream.SampleRate = 0;
break;
}
if (bsid <= 10)
{
var fSize = frameSizeCode >> 1;
if (fSize < 19)
{
stream.BitRate = AC3Bitrate[fSize] * 1000;
}
}
else
{
stream.BitRate = (long)(4.0 * frameSize * stream.SampleRate / (numBlocks * 256));
if (stream.CoreStream != null)
{
stream.BitRate += stream.CoreStream.BitRate;
}
}
stream.LFE = (int)lfeOn;
if (stream.StreamType != TSStreamType.AC3_PLUS_SECONDARY_AUDIO)
{
if (stream.StreamType == TSStreamType.AC3_PLUS_AUDIO && bsid == 6 || stream.StreamType == TSStreamType.AC3_AUDIO)
{
stream.DialNorm = (int)dialNorm * -1;
}
else if (stream.StreamType == TSStreamType.AC3_PLUS_AUDIO && secondFrame)
{
stream.DialNorm = (int)dialNormExt * -1;
}
}
stream.IsVBR = false;
if (stream.StreamType == TSStreamType.AC3_PLUS_AUDIO && bsid == 6 && !secondFrame)
{
stream.IsInitialized = false;
}
else
{
stream.IsInitialized = true;
}
}
