//============================================================================ // 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; } } }