2016-10-26 19:29:56 +00:00
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//============================================================================
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// BDInfo - Blu-ray Video and Audio Analysis Tool
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// Copyright © 2010 Cinema Squid
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//=============================================================================
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#undef DEBUG
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using System.IO;
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namespace BDInfo
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{
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public abstract class TSCodecAC3
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{
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2019-01-13 19:15:15 +00:00
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private static byte[] eac3_blocks = new byte[] { 1, 2, 3, 6 };
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2016-10-26 19:29:56 +00:00
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public static void Scan(
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TSAudioStream stream,
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TSStreamBuffer buffer,
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ref string tag)
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{
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if (stream.IsInitialized) return;
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byte[] sync = buffer.ReadBytes(2);
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if (sync == null ||
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sync[0] != 0x0B ||
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sync[1] != 0x77)
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{
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return;
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}
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int sr_code = 0;
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int frame_size = 0;
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int frame_size_code = 0;
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int channel_mode = 0;
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int lfe_on = 0;
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int dial_norm = 0;
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int num_blocks = 0;
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byte[] hdr = buffer.ReadBytes(4);
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int bsid = (hdr[3] & 0xF8) >> 3;
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buffer.Seek(-4, SeekOrigin.Current);
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if (bsid <= 10)
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{
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byte[] crc = buffer.ReadBytes(2);
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sr_code = buffer.ReadBits(2);
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frame_size_code = buffer.ReadBits(6);
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bsid = buffer.ReadBits(5);
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int bsmod = buffer.ReadBits(3);
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channel_mode = buffer.ReadBits(3);
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int cmixlev = 0;
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if (((channel_mode & 0x1) > 0) && (channel_mode != 0x1))
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{
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cmixlev = buffer.ReadBits(2);
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}
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int surmixlev = 0;
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if ((channel_mode & 0x4) > 0)
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{
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surmixlev = buffer.ReadBits(2);
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}
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int dsurmod = 0;
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if (channel_mode == 0x2)
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{
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dsurmod = buffer.ReadBits(2);
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if (dsurmod == 0x2)
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{
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stream.AudioMode = TSAudioMode.Surround;
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}
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}
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lfe_on = buffer.ReadBits(1);
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dial_norm = buffer.ReadBits(5);
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int compr = 0;
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if (1 == buffer.ReadBits(1))
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{
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compr = buffer.ReadBits(8);
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}
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int langcod = 0;
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if (1 == buffer.ReadBits(1))
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{
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langcod = buffer.ReadBits(8);
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}
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int mixlevel = 0;
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int roomtyp = 0;
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if (1 == buffer.ReadBits(1))
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{
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mixlevel = buffer.ReadBits(5);
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roomtyp = buffer.ReadBits(2);
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}
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if (channel_mode == 0)
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{
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int dialnorm2 = buffer.ReadBits(5);
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int compr2 = 0;
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if (1 == buffer.ReadBits(1))
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{
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compr2 = buffer.ReadBits(8);
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}
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int langcod2 = 0;
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if (1 == buffer.ReadBits(1))
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{
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langcod2 = buffer.ReadBits(8);
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}
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int mixlevel2 = 0;
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int roomtyp2 = 0;
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if (1 == buffer.ReadBits(1))
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{
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mixlevel2 = buffer.ReadBits(5);
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roomtyp2 = buffer.ReadBits(2);
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}
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}
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int copyrightb = buffer.ReadBits(1);
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int origbs = buffer.ReadBits(1);
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if (bsid == 6)
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{
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if (1 == buffer.ReadBits(1))
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{
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int dmixmod = buffer.ReadBits(2);
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int ltrtcmixlev = buffer.ReadBits(3);
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int ltrtsurmixlev = buffer.ReadBits(3);
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int lorocmixlev = buffer.ReadBits(3);
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int lorosurmixlev = buffer.ReadBits(3);
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}
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if (1 == buffer.ReadBits(1))
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{
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int dsurexmod = buffer.ReadBits(2);
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int dheadphonmod = buffer.ReadBits(2);
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if (dheadphonmod == 0x2)
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{
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// TODO
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}
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int adconvtyp = buffer.ReadBits(1);
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int xbsi2 = buffer.ReadBits(8);
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int encinfo = buffer.ReadBits(1);
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if (dsurexmod == 2)
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{
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stream.AudioMode = TSAudioMode.Extended;
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}
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}
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}
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}
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else
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{
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int frame_type = buffer.ReadBits(2);
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int substreamid = buffer.ReadBits(3);
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frame_size = (buffer.ReadBits(11) + 1) << 1;
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sr_code = buffer.ReadBits(2);
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if (sr_code == 3)
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{
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sr_code = buffer.ReadBits(2);
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}
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else
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{
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num_blocks = buffer.ReadBits(2);
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}
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channel_mode = buffer.ReadBits(3);
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lfe_on = buffer.ReadBits(1);
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}
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switch (channel_mode)
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{
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case 0: // 1+1
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stream.ChannelCount = 2;
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if (stream.AudioMode == TSAudioMode.Unknown)
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{
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stream.AudioMode = TSAudioMode.DualMono;
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}
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break;
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case 1: // 1/0
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stream.ChannelCount = 1;
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break;
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case 2: // 2/0
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stream.ChannelCount = 2;
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if (stream.AudioMode == TSAudioMode.Unknown)
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{
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stream.AudioMode = TSAudioMode.Stereo;
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}
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break;
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case 3: // 3/0
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stream.ChannelCount = 3;
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break;
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case 4: // 2/1
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stream.ChannelCount = 3;
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break;
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case 5: // 3/1
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stream.ChannelCount = 4;
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break;
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case 6: // 2/2
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stream.ChannelCount = 4;
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break;
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case 7: // 3/2
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stream.ChannelCount = 5;
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break;
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default:
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stream.ChannelCount = 0;
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break;
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}
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switch (sr_code)
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{
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case 0:
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stream.SampleRate = 48000;
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break;
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case 1:
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stream.SampleRate = 44100;
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break;
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case 2:
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stream.SampleRate = 32000;
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break;
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default:
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stream.SampleRate = 0;
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break;
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}
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if (bsid <= 10)
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{
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switch (frame_size_code >> 1)
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{
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case 18:
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stream.BitRate = 640000;
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break;
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case 17:
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stream.BitRate = 576000;
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break;
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case 16:
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stream.BitRate = 512000;
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break;
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case 15:
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stream.BitRate = 448000;
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break;
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case 14:
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stream.BitRate = 384000;
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break;
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case 13:
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stream.BitRate = 320000;
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break;
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case 12:
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stream.BitRate = 256000;
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break;
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case 11:
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stream.BitRate = 224000;
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break;
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case 10:
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stream.BitRate = 192000;
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break;
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case 9:
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stream.BitRate = 160000;
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break;
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case 8:
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stream.BitRate = 128000;
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break;
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case 7:
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stream.BitRate = 112000;
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break;
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case 6:
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stream.BitRate = 96000;
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break;
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case 5:
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stream.BitRate = 80000;
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break;
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case 4:
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stream.BitRate = 64000;
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break;
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case 3:
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stream.BitRate = 56000;
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break;
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case 2:
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stream.BitRate = 48000;
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break;
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case 1:
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stream.BitRate = 40000;
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break;
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case 0:
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stream.BitRate = 32000;
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break;
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default:
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stream.BitRate = 0;
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break;
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}
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}
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else
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{
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stream.BitRate = (long)
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(4.0 * frame_size * stream.SampleRate / (num_blocks * 256));
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}
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stream.LFE = lfe_on;
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if (stream.StreamType != TSStreamType.AC3_PLUS_AUDIO &&
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stream.StreamType != TSStreamType.AC3_PLUS_SECONDARY_AUDIO)
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{
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stream.DialNorm = dial_norm - 31;
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}
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stream.IsVBR = false;
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stream.IsInitialized = true;
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}
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}
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}
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