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209 lines
7.8 KiB
209 lines
7.8 KiB
//============================================================================
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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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namespace BDInfo
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{
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public abstract class TSCodecMPEG2
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{
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public static void Scan(
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TSVideoStream stream,
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TSStreamBuffer buffer,
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ref string tag)
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{
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int parse = 0;
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int pictureParse = 0;
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int sequenceHeaderParse = 0;
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int extensionParse = 0;
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int sequenceExtensionParse = 0;
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for (int i = 0; i < buffer.Length; i++)
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{
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parse = (parse << 8) + buffer.ReadByte();
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if (parse == 0x00000100)
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{
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pictureParse = 2;
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}
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else if (parse == 0x000001B3)
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{
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sequenceHeaderParse = 7;
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}
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else if (sequenceHeaderParse > 0)
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{
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--sequenceHeaderParse;
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switch (sequenceHeaderParse)
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{
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#if DEBUG
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case 6:
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break;
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case 5:
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break;
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case 4:
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stream.Width =
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(int)((parse & 0xFFF000) >> 12);
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stream.Height =
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(int)(parse & 0xFFF);
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break;
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case 3:
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stream.AspectRatio =
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(TSAspectRatio)((parse & 0xF0) >> 4);
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switch ((parse & 0xF0) >> 4)
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{
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case 0: // Forbidden
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break;
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case 1: // Square
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break;
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case 2: // 4:3
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break;
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case 3: // 16:9
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break;
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case 4: // 2.21:1
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break;
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default: // Reserved
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break;
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}
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switch (parse & 0xF)
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{
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case 0: // Forbidden
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break;
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case 1: // 23.976
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stream.FrameRateEnumerator = 24000;
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stream.FrameRateDenominator = 1001;
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break;
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case 2: // 24
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stream.FrameRateEnumerator = 24000;
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stream.FrameRateDenominator = 1000;
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break;
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case 3: // 25
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stream.FrameRateEnumerator = 25000;
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stream.FrameRateDenominator = 1000;
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break;
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case 4: // 29.97
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stream.FrameRateEnumerator = 30000;
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stream.FrameRateDenominator = 1001;
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break;
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case 5: // 30
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stream.FrameRateEnumerator = 30000;
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stream.FrameRateDenominator = 1000;
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break;
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case 6: // 50
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stream.FrameRateEnumerator = 50000;
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stream.FrameRateDenominator = 1000;
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break;
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case 7: // 59.94
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stream.FrameRateEnumerator = 60000;
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stream.FrameRateDenominator = 1001;
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break;
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case 8: // 60
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stream.FrameRateEnumerator = 60000;
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stream.FrameRateDenominator = 1000;
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break;
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default: // Reserved
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stream.FrameRateEnumerator = 0;
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stream.FrameRateDenominator = 0;
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break;
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}
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break;
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case 2:
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break;
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case 1:
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break;
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#endif
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case 0:
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#if DEBUG
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stream.BitRate =
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(((parse & 0xFFFFC0) >> 6) * 200);
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#endif
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stream.IsVBR = true;
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stream.IsInitialized = true;
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break;
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}
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}
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else if (pictureParse > 0)
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{
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--pictureParse;
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if (pictureParse == 0)
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{
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switch ((parse & 0x38) >> 3)
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{
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case 1:
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tag = "I";
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break;
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case 2:
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tag = "P";
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break;
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case 3:
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tag = "B";
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break;
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default:
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break;
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}
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if (stream.IsInitialized) return;
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}
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}
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else if (parse == 0x000001B5)
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{
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extensionParse = 1;
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}
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else if (extensionParse > 0)
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{
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--extensionParse;
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if (extensionParse == 0)
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{
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if ((parse & 0xF0) == 0x10)
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{
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sequenceExtensionParse = 1;
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}
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}
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}
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else if (sequenceExtensionParse > 0)
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{
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--sequenceExtensionParse;
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#if DEBUG
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if (sequenceExtensionParse == 0)
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{
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uint sequenceExtension =
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((parse & 0x8) >> 3);
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if (sequenceExtension == 0)
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{
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stream.IsInterlaced = true;
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}
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else
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{
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stream.IsInterlaced = false;
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}
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}
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#endif
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}
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}
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}
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}
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}
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