|
public static Scan ( |
||
| stream | ||
| buffer | ||
| tag | string | |
| Результат | void | |
public static void Scan(
TSAudioStream stream,
TSStreamBuffer buffer,
ref string tag)
{
if (stream.IsInitialized) return;
byte[] sync = buffer.ReadBytes(2);
if (sync == null ||
sync[0] != 0x0B ||
sync[1] != 0x77)
{
return;
}
int sr_code = 0;
int frame_size = 0;
int frame_size_code = 0;
int channel_mode = 0;
int lfe_on = 0;
int dial_norm = 0;
int num_blocks = 0;
byte[] hdr = buffer.ReadBytes(4);
int bsid = (hdr[3] & 0xF8) >> 3;
buffer.Seek(-4, SeekOrigin.Current);
if (bsid <= 10)
{
byte[] crc = buffer.ReadBytes(2);
sr_code = buffer.ReadBits(2);
frame_size_code = buffer.ReadBits(6);
bsid = buffer.ReadBits(5);
int bsmod = buffer.ReadBits(3);
channel_mode = buffer.ReadBits(3);
int cmixlev = 0;
if (((channel_mode & 0x1) > 0) && (channel_mode != 0x1))
{
cmixlev = buffer.ReadBits(2);
}
int surmixlev = 0;
if ((channel_mode & 0x4) > 0)
{
surmixlev = buffer.ReadBits(2);
}
int dsurmod = 0;
if (channel_mode == 0x2)
{
dsurmod = buffer.ReadBits(2);
if (dsurmod == 0x2)
{
stream.AudioMode = TSAudioMode.Surround;
}
}
lfe_on = buffer.ReadBits(1);
dial_norm = buffer.ReadBits(5);
int compr = 0;
if (1 == buffer.ReadBits(1))
{
compr = buffer.ReadBits(8);
}
int langcod = 0;
if (1 == buffer.ReadBits(1))
{
langcod = buffer.ReadBits(8);
}
int mixlevel = 0;
int roomtyp = 0;
if (1 == buffer.ReadBits(1))
{
mixlevel = buffer.ReadBits(5);
roomtyp = buffer.ReadBits(2);
}
if (channel_mode == 0)
{
int dialnorm2 = buffer.ReadBits(5);
int compr2 = 0;
if (1 == buffer.ReadBits(1))
{
compr2 = buffer.ReadBits(8);
}
int langcod2 = 0;
if (1 == buffer.ReadBits(1))
{
langcod2 = buffer.ReadBits(8);
}
int mixlevel2 = 0;
int roomtyp2 = 0;
if (1 == buffer.ReadBits(1))
{
mixlevel2 = buffer.ReadBits(5);
roomtyp2 = buffer.ReadBits(2);
}
}
int copyrightb = buffer.ReadBits(1);
int origbs = buffer.ReadBits(1);
if (bsid == 6)
{
if (1 == buffer.ReadBits(1))
{
int dmixmod = buffer.ReadBits(2);
int ltrtcmixlev = buffer.ReadBits(3);
int ltrtsurmixlev = buffer.ReadBits(3);
int lorocmixlev = buffer.ReadBits(3);
int lorosurmixlev = buffer.ReadBits(3);
}
if (1 == buffer.ReadBits(1))
{
int dsurexmod = buffer.ReadBits(2);
int dheadphonmod = buffer.ReadBits(2);
if (dheadphonmod == 0x2)
{
// TODO
}
int adconvtyp = buffer.ReadBits(1);
int xbsi2 = buffer.ReadBits(8);
int encinfo = buffer.ReadBits(1);
if (dsurexmod == 2)
{
stream.AudioMode = TSAudioMode.Extended;
}
}
}
}
else
{
int frame_type = buffer.ReadBits(2);
int substreamid = buffer.ReadBits(3);
frame_size = (buffer.ReadBits(11) + 1) << 1;
sr_code = buffer.ReadBits(2);
if (sr_code == 3)
{
sr_code = buffer.ReadBits(2);
}
else
{
num_blocks = buffer.ReadBits(2);
}
channel_mode = buffer.ReadBits(3);
lfe_on = buffer.ReadBits(1);
}
switch (channel_mode)
{
case 0: // 1+1
stream.ChannelCount = 2;
if (stream.AudioMode == TSAudioMode.Unknown)
{
stream.AudioMode = TSAudioMode.DualMono;
}
break;
case 1: // 1/0
stream.ChannelCount = 1;
break;
case 2: // 2/0
stream.ChannelCount = 2;
if (stream.AudioMode == TSAudioMode.Unknown)
{
stream.AudioMode = TSAudioMode.Stereo;
}
break;
case 3: // 3/0
stream.ChannelCount = 3;
break;
case 4: // 2/1
stream.ChannelCount = 3;
break;
case 5: // 3/1
stream.ChannelCount = 4;
break;
case 6: // 2/2
stream.ChannelCount = 4;
break;
case 7: // 3/2
stream.ChannelCount = 5;
break;
default:
stream.ChannelCount = 0;
break;
}
switch (sr_code)
{
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)
{
switch (frame_size_code >> 1)
{
case 18:
stream.BitRate = 640000;
break;
case 17:
stream.BitRate = 576000;
break;
case 16:
stream.BitRate = 512000;
break;
case 15:
stream.BitRate = 448000;
break;
case 14:
stream.BitRate = 384000;
break;
case 13:
stream.BitRate = 320000;
break;
case 12:
stream.BitRate = 256000;
break;
case 11:
stream.BitRate = 224000;
break;
case 10:
stream.BitRate = 192000;
break;
case 9:
stream.BitRate = 160000;
break;
case 8:
stream.BitRate = 128000;
break;
case 7:
stream.BitRate = 112000;
break;
case 6:
stream.BitRate = 96000;
break;
case 5:
stream.BitRate = 80000;
break;
case 4:
stream.BitRate = 64000;
break;
case 3:
stream.BitRate = 56000;
break;
case 2:
stream.BitRate = 48000;
break;
case 1:
stream.BitRate = 40000;
break;
case 0:
stream.BitRate = 32000;
break;
default:
stream.BitRate = 0;
break;
}
}
else
{
stream.BitRate = (long)
(4.0 * frame_size * stream.SampleRate / (num_blocks * 256));
}
stream.LFE = lfe_on;
if (stream.StreamType != TSStreamType.AC3_PLUS_AUDIO &&
stream.StreamType != TSStreamType.AC3_PLUS_SECONDARY_AUDIO)
{
stream.DialNorm = dial_norm - 31;
}
stream.IsVBR = false;
stream.IsInitialized = true;
}
} public static void Scan(
TSAudioStream stream,
TSStreamBuffer buffer,
ref string tag)
{
if (stream.IsInitialized &&
stream.CoreStream != null &&
stream.CoreStream.IsInitialized)
{
return;
}
bool syncFound = false;
uint sync = 0;
for (int i = 0; i < buffer.Length; i++)
{
sync = (sync << 8) + buffer.ReadByte();
if (sync == 0xF8726FBA)
{
syncFound = true;
break;
}
}
if (!syncFound)
{
tag = "CORE";
if (stream.CoreStream == null)
{
stream.CoreStream = new TSAudioStream();
stream.CoreStream.StreamType = TSStreamType.AC3_AUDIO;
}
if (!stream.CoreStream.IsInitialized)
{
buffer.BeginRead();
TSCodecAC3.Scan(stream.CoreStream, buffer, ref tag);
}
return;
}
tag = "HD";
int ratebits = buffer.ReadBits(4);
if (ratebits != 0xF)
{
stream.SampleRate =
(((ratebits & 8) > 0 ? 44100 : 48000) << (ratebits & 7));
}
int temp1 = buffer.ReadBits(8);
int channels_thd_stream1 = buffer.ReadBits(5);
int temp2 = buffer.ReadBits(2);
stream.ChannelCount = 0;
stream.LFE = 0;
int c_LFE2 = buffer.ReadBits(1);
if (c_LFE2 == 1)
{
stream.LFE += 1;
}
int c_Cvh = buffer.ReadBits(1);
if (c_Cvh == 1)
{
stream.ChannelCount += 1;
}
int c_LRw = buffer.ReadBits(1);
if (c_LRw == 1)
{
stream.ChannelCount += 2;
}
int c_LRsd = buffer.ReadBits(1);
if (c_LRsd == 1)
{
stream.ChannelCount += 2;
}
int c_Ts = buffer.ReadBits(1);
if (c_Ts == 1)
{
stream.ChannelCount += 1;
}
int c_Cs = buffer.ReadBits(1);
if (c_Cs == 1)
{
stream.ChannelCount += 1;
}
int c_LRrs = buffer.ReadBits(1);
if (c_LRrs == 1)
{
stream.ChannelCount += 2;
}
int c_LRc = buffer.ReadBits(1);
if (c_LRc == 1)
{
stream.ChannelCount += 2;
}
int c_LRvh = buffer.ReadBits(1);
if (c_LRvh == 1)
{
stream.ChannelCount += 2;
}
int c_LRs = buffer.ReadBits(1);
if (c_LRs == 1)
{
stream.ChannelCount += 2;
}
int c_LFE = buffer.ReadBits(1);
if (c_LFE == 1)
{
stream.LFE += 1;
}
int c_C = buffer.ReadBits(1);
if (c_C == 1)
{
stream.ChannelCount += 1;
}
int c_LR = buffer.ReadBits(1);
if (c_LR == 1)
{
stream.ChannelCount += 2;
}
int access_unit_size = 40 << (ratebits & 7);
int access_unit_size_pow2 = 64 << (ratebits & 7);
int a1 = buffer.ReadBits(16);
int a2 = buffer.ReadBits(16);
int a3 = buffer.ReadBits(16);
int is_vbr = buffer.ReadBits(1);
int peak_bitrate = buffer.ReadBits(15);
peak_bitrate = (peak_bitrate * stream.SampleRate) >> 4;
double peak_bitdepth =
(double)peak_bitrate /
(stream.ChannelCount + stream.LFE) /
stream.SampleRate;
if (peak_bitdepth > 14)
{
stream.BitDepth = 24;
}
else
{
stream.BitDepth = 16;
}
#if DEBUG
System.Diagnostics.Debug.WriteLine(string.Format(
"{0}\t{1}\t{2:F2}",
stream.PID, peak_bitrate, peak_bitdepth));
#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;
stream.IsInitialized = true;
}
