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-rw-r--r--BDInfo/TSCodecAC3.cs309
1 files changed, 309 insertions, 0 deletions
diff --git a/BDInfo/TSCodecAC3.cs b/BDInfo/TSCodecAC3.cs
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+++ b/BDInfo/TSCodecAC3.cs
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+//============================================================================
+// BDInfo - Blu-ray Video and Audio Analysis Tool
+// Copyright © 2010 Cinema Squid
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+//=============================================================================
+
+#undef DEBUG
+using System.IO;
+
+namespace BDInfo
+{
+ public abstract class TSCodecAC3
+ {
+ private static byte[] eac3_blocks = new byte[] { 1, 2, 3, 6 };
+
+ 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;
+ }
+ }
+}
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