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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 | ||
| //============================================================================= | ||
|
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||
| #undef DEBUG | ||
|
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||
| namespace BDInfo | ||
| { | ||
| public abstract class TSCodecAAC | ||
| { | ||
| private static readonly string[] AACID = | ||
| { | ||
| "MPEG-4", | ||
| "MPEG-2", | ||
| }; | ||
|
|
||
| private static string GetAACProfile(int profileType) | ||
| { | ||
| switch (profileType) | ||
| { | ||
| case 0: return "AAC Main"; | ||
| case 1: return "AAC LC"; | ||
| case 2: return "AAC SSR"; | ||
| case 3: return "AAC LTP"; | ||
| case 16: return "ER AAC LC"; | ||
| case 18: return "ER AAC LTP"; | ||
| case 36: return "SLS"; | ||
| default: return ""; | ||
| } | ||
| } | ||
|
|
||
| public static int[] AACSampleRates = | ||
| { | ||
| 96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050, | ||
| 16000, 12000, 11025, 8000, 7350, 0, 0, 57600, | ||
| 51200, 40000, 38400, 34150, 28800, 25600, 20000, 19200, | ||
| 17075, 14400, 12800, 9600, 0, 0, 0 | ||
| }; | ||
|
|
||
| private const int AACChannelsSize = 8; | ||
|
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| public static int[] AACChannels = { 0, 1, 2, 3, 4, 5, 6, 8 }; | ||
|
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| private static readonly byte[] AACChannelModes = | ||
| { | ||
| (byte)TSAudioMode.Unknown, | ||
| (byte)TSAudioMode.Mono, | ||
| (byte)TSAudioMode.Stereo, | ||
| (byte)TSAudioMode.Extended, | ||
| (byte)TSAudioMode.Surround, | ||
| (byte)TSAudioMode.Surround, | ||
| (byte)TSAudioMode.Surround, | ||
| (byte)TSAudioMode.Surround, | ||
| }; | ||
|
|
||
| public static void Scan(TSAudioStream stream, TSStreamBuffer buffer, ref string tag) | ||
| { | ||
| if (stream.IsInitialized) return; | ||
|
|
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| int syncWord = buffer.ReadBits2(12); | ||
| if (syncWord != 0b1111_1111_1111) return; | ||
|
|
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| // fixed header | ||
| int audioVersionID = buffer.ReadBits2(1); | ||
| int layerIndex = buffer.ReadBits2(2); | ||
| bool protectionAbsent = buffer.ReadBool(); | ||
| int profileObjectType = buffer.ReadBits2(2); | ||
| int samplingRateIndex = buffer.ReadBits2(4); | ||
| bool privateBit = buffer.ReadBool(); | ||
| int channelMode = buffer.ReadBits2(3); | ||
| bool originalBit = buffer.ReadBool(); | ||
| bool home = buffer.ReadBool(); | ||
|
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|
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| if (samplingRateIndex <= 13) | ||
| stream.SampleRate = AACSampleRates[samplingRateIndex]; | ||
| else | ||
| stream.SampleRate = 0; | ||
|
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|
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| if (channelMode <= AACChannelsSize) | ||
| { | ||
| stream.AudioMode = (TSAudioMode)AACChannelModes[channelMode]; | ||
| stream.ChannelCount = AACChannels[channelMode]; | ||
| } | ||
| else | ||
| { | ||
| stream.ChannelCount = 0; | ||
| stream.AudioMode = TSAudioMode.Unknown; | ||
| } | ||
|
|
||
| if (channelMode >=7 && channelMode <= 8) | ||
| { | ||
| stream.ChannelCount--; | ||
| stream.LFE = 1; | ||
| } | ||
| else | ||
| stream.LFE = 0; | ||
|
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| stream.ExtendedData = $"{AACID[audioVersionID]} {GetAACProfile(profileObjectType)}"; | ||
|
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| stream.IsVBR = true; | ||
| stream.IsInitialized = true; | ||
| } | ||
| } | ||
| } |
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