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;
}
}
public static void Scan(TSAudioStream stream, TSStreamBuffer buffer, long bitrate, ref string tag)
{
if (stream.IsInitialized &&
(stream.StreamType == TSStreamType.DTS_HD_SECONDARY_AUDIO ||
(stream.CoreStream != null &&
stream.CoreStream.IsInitialized)))
{
return;
}
var syncFound = false;
uint sync = 0;
for (var i = 0; i < buffer.Length; i++)
{
sync = (sync << 8) + buffer.ReadByte();
if (sync == 0x64582025)
{
syncFound = true;
break;
}
}
if (!syncFound)
{
tag = "CORE";
if (stream.CoreStream == null)
{
stream.CoreStream = new TSAudioStream {
StreamType = TSStreamType.DTS_AUDIO
};
}
if (!stream.CoreStream.IsInitialized)
{
buffer.BeginRead();
TSCodecDTS.Scan(stream.CoreStream, buffer, bitrate, ref tag);
}
return;
}
tag = "HD";
buffer.BSSkipBits(8);
var nuSubStreamIndex = buffer.ReadBits4(2);
var bBlownUpHeader = buffer.ReadBool();
buffer.BSSkipBits(bBlownUpHeader ? 32 : 24);
var nuNumAssets = 1;
var bStaticFieldsPresent = buffer.ReadBool();
if (bStaticFieldsPresent)
{
buffer.BSSkipBits(5);
if (buffer.ReadBool())
{
buffer.BSSkipBits(36);
}
var nuNumAudioPresent = buffer.ReadBits2(3) + 1;
nuNumAssets = buffer.ReadBits2(3) + 1;
var nuActiveExSsMask = new uint[nuNumAudioPresent];
for (var i = 0; i < nuNumAudioPresent; i++)
{
nuActiveExSsMask[i] = buffer.ReadBits4((int)(nuSubStreamIndex + 1)); //?
}
for (var i = 0; i < nuNumAudioPresent; i++)
{
for (var j = 0; j < nuSubStreamIndex + 1; j++)
{
if (((j + 1) % 2) == 1)
{
buffer.BSSkipBits(8);
}
}
}
if (buffer.ReadBool())
{
buffer.BSSkipBits(2);
var nuBits4MixOutMask = buffer.ReadBits2(2) * 4 + 4;
var nuNumMixOutConfigs = buffer.ReadBits2(2) + 1;
var nuMixOutChMask = new uint[nuNumMixOutConfigs];
for (var i = 0; i < nuNumMixOutConfigs; i++)
{
nuMixOutChMask[i] = buffer.ReadBits4(nuBits4MixOutMask);
}
}
}
var assetSizes = new uint[nuNumAssets];
for (var i = 0; i < nuNumAssets; i++)
{
if (bBlownUpHeader)
{
assetSizes[i] = buffer.ReadBits4(20) + 1;
}
else
{
assetSizes[i] = buffer.ReadBits4(16) + 1;
}
}
for (var i = 0; i < nuNumAssets; i++)
{
buffer.BSSkipBits(12);
if (bStaticFieldsPresent)
{
if (buffer.ReadBool())
{
buffer.BSSkipBits(4);
}
if (buffer.ReadBool())
{
buffer.BSSkipBits(24);
}
if (buffer.ReadBool())
{
var nuInfoTextByteSize = buffer.ReadBits2(10) + 1;
var infoText = new ushort[nuInfoTextByteSize];
for (var j = 0; j < nuInfoTextByteSize; j++)
{
infoText[j] = buffer.ReadBits2(8);
}
}
var nuBitResolution = buffer.ReadBits2(5) + 1;
int nuMaxSampleRate = buffer.ReadBits2(4);
var nuTotalNumChs = buffer.ReadBits2(8) + 1;
uint nuSpkrActivityMask = 0;
if (buffer.ReadBool())
{
if (nuTotalNumChs > 2)
{
buffer.BSSkipBits(1);
}
if (nuTotalNumChs > 6)
{
buffer.BSSkipBits(1);
}
if (buffer.ReadBool())
{
int nuNumBits4SAMask = buffer.ReadBits2(2);
nuNumBits4SAMask = nuNumBits4SAMask * 4 + 4;
nuSpkrActivityMask = buffer.ReadBits4(nuNumBits4SAMask);
}
// TODO...
}
stream.SampleRate = SampleRates[nuMaxSampleRate];
stream.BitDepth = nuBitResolution;
stream.LFE = 0;
if ((nuSpkrActivityMask & 0x8) == 0x8)
{
++stream.LFE;
}
if ((nuSpkrActivityMask & 0x1000) == 0x1000)
{
++stream.LFE;
}
stream.ChannelCount = nuTotalNumChs - stream.LFE;
}
if (nuNumAssets > 1)
{
// TODO...
break;
}
}
uint temp2 = 0;
while (buffer.Position < buffer.Length)
{
temp2 = (temp2 << 8) + buffer.ReadByte();
switch (temp2)
{
case 0x41A29547: // XLL Extended data
case 0x655E315E: // XBR Extended data
case 0x0A801921: // XSA Extended data
case 0x1D95F262: // X96k
case 0x47004A03: // XXch
case 0x5A5A5A5A: // Xch
int temp3 = 0;
for (var i = (int)buffer.Position; i < buffer.Length; i++)
{
temp3 = (temp3 << 8) + buffer.ReadByte();
if (temp3 == 0x02000850) //DTS:X Pattern
{
stream.HasExtensions = true;
break;
}
}
break;
}
if (stream.HasExtensions)
{
break;
}
}
// TODO
if (stream.CoreStream != null)
{
var coreStream = (TSAudioStream)stream.CoreStream;
if (coreStream.AudioMode == TSAudioMode.Extended &&
stream.ChannelCount == 5)
{
stream.AudioMode = TSAudioMode.Extended;
}
/*
* if (coreStream.DialNorm != 0)
* {
* stream.DialNorm = coreStream.DialNorm;
* }
*/
}
if (stream.StreamType == TSStreamType.DTS_HD_MASTER_AUDIO)
{
stream.IsVBR = true;
stream.IsInitialized = true;
}
else if (bitrate > 0)
{
stream.IsVBR = false;
stream.BitRate = bitrate;
if (stream.CoreStream != null)
{
stream.BitRate += stream.CoreStream.BitRate;
stream.IsInitialized = true;
}
stream.IsInitialized = (stream.BitRate > 0);
}
}
public void Scan(TSAudioStream stream, TSStreamBuffer buffer, ref string tag, long?bitrate)
{
if (stream.IsInitialized && stream.CoreStream != null && stream.CoreStream.IsInitialized)
{
return;
}
var syncFound = false;
uint sync = 0;
for (var i = 0; i < buffer.Length; i++)
{
sync = (sync << 8) + buffer.ReadByte();
if (sync == 0xF8726FBA)
{
syncFound = true;
break;
}
}
if (!syncFound)
{
tag = "CORE";
stream.CoreStream ??= new TSAudioStream {
StreamType = TSStreamType.AC3_AUDIO
};
if (stream.CoreStream.IsInitialized)
{
return;
}
buffer.BeginRead();
(new TSCodecAC3()).Scan(stream.CoreStream, buffer, ref tag, bitrate);
return;
}
tag = "HD";
int ratebits = buffer.ReadBits2(4);
if (ratebits != 0xF)
{
stream.SampleRate = ((ratebits & 8) > 0 ? 44100 : 48000) << (ratebits & 7);
}
buffer.BSSkipBits(15);
stream.ChannelCount = 0;
stream.LFE = 0;
if (buffer.ReadBool())
{
stream.LFE += 1;
}
if (buffer.ReadBool())
{
stream.ChannelCount += 1;
}
if (buffer.ReadBool())
{
stream.ChannelCount += 2;
}
if (buffer.ReadBool())
{
stream.ChannelCount += 2;
}
if (buffer.ReadBool())
{
stream.ChannelCount += 1;
}
if (buffer.ReadBool())
{
stream.ChannelCount += 1;
}
if (buffer.ReadBool())
{
stream.ChannelCount += 2;
}
if (buffer.ReadBool())
{
stream.ChannelCount += 2;
}
if (buffer.ReadBool())
{
stream.ChannelCount += 2;
}
if (buffer.ReadBool())
{
stream.ChannelCount += 2;
}
if (buffer.ReadBool())
{
stream.LFE += 1;
}
if (buffer.ReadBool())
{
stream.ChannelCount += 1;
}
if (buffer.ReadBool())
{
stream.ChannelCount += 2;
}
buffer.BSSkipBits(49);
var peakBitrate = buffer.ReadBits4(15);
peakBitrate = (uint)((peakBitrate * stream.SampleRate) >> 4);
var peakBitdepth = (double)peakBitrate / (stream.ChannelCount + stream.LFE) / stream.SampleRate;
stream.BitDepth = peakBitdepth > 14 ? 24 : 16;
buffer.BSSkipBits(79);
var hasExtensions = buffer.ReadBool();
var numExtensions = buffer.ReadBits2(4) * 2 + 1;
var hasContent = Convert.ToBoolean(buffer.ReadBits4(4));
if (hasExtensions)
{
for (var idx = 0; idx < numExtensions; ++idx)
{
if (Convert.ToBoolean(buffer.ReadBits2(8)))
{
hasContent = true;
}
}
if (hasContent)
{
stream.HasExtensions = true;
}
}
#if DEBUG
Debug.WriteLine($"{stream.PID}\t{peakBitrate}\t{peakBitdepth:F2}");
#endif
/*
* // TODO: Get THD dialnorm from metadata
* if (stream.CoreStream != null)
* {
* TSAudioStream coreStream = (TSAudioStream)stream.CoreStream;
* if (coreStream.DialNorm != 0)
* {
* stream.DialNorm = coreStream.DialNorm;
* }
* }
*/
stream.IsVBR = true;
if (stream.CoreStream != null && stream.CoreStream.IsInitialized)
{
stream.IsInitialized = true;
}
}