383 lines
13 KiB
C#
383 lines
13 KiB
C#
using System;
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using System.Collections.Generic;
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using log4net;
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namespace TBF.BenchControl.Network.Camera
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{
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/// <summary>
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/// Implements RFC2435
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/// </summary>
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public class JpegFrame : RtpFrame
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{
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static readonly ILog log = LogManager.GetLogger(typeof(MainWnd));
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#region Statics
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static byte[] CreateStartOfInformation()
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{
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return new byte[] { 0xff, 0xd8 };
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}
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static byte[] CreateJFIFHeader(uint type, uint width, uint height, ArraySegment<byte> tables, uint dri)
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{
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List<byte> result = new List<byte>();
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result.AddRange(CreateStartOfInformation());
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result.Add(0xff);
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result.Add(0xe0);//AppFirst
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result.Add(0x00);
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result.Add(0x10);//length
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result.Add((byte)'J');
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result.Add((byte)'F');
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result.Add((byte)'I');
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result.Add((byte)'F');
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result.Add(0x00);
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result.Add(0x01);//Version Major
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result.Add(0x01);//Version Minor
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result.Add(0x00);//Units
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result.Add(0x00);//Horizontal
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result.Add(0x01);
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result.Add(0x00);//Vertical
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result.Add(0x01);
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result.Add(0x00);//No thumb
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result.Add(0x00);
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if (dri > 0)
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{
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result.AddRange(CreateDataRestartIntervalMarker(dri));
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}
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result.AddRange(CreateQuantizationTablesMarker(tables));
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result.Add(0xff);
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result.Add(0xc0);//SOF
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result.Add(0x00);
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result.Add(0x11);
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result.Add(0x08);
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result.Add((byte)(height >> 8));
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result.Add((byte)height);
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result.Add((byte)(width >> 8));
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result.Add((byte)width);
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result.Add(0x03);
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result.Add(0x01);
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result.Add((byte)(type > 0 ? 0x22 : 0x21));
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result.Add(0x00);
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result.Add(0x02);
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result.Add(0x11);
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result.Add(0x01);
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result.Add(0x03);
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result.Add(0x11);
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result.Add(0x01);
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//Huffman Tables
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result.AddRange(CreateHuffmanTableMarker(lum_dc_codelens, lum_dc_symbols, 0, 0));
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result.AddRange(CreateHuffmanTableMarker(lum_ac_codelens, lum_ac_symbols, 0, 1));
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result.AddRange(CreateHuffmanTableMarker(chm_dc_codelens, chm_dc_symbols, 1, 0));
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result.AddRange(CreateHuffmanTableMarker(chm_ac_codelens, chm_ac_symbols, 1, 1));
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result.Add(0xff);
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result.Add(0xda);//Marker SOS
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result.Add(0x00);
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result.Add(0x0c);
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result.Add(0x03);
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result.Add(0x01);
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result.Add(0x00);
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result.Add(0x02);
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result.Add(0x11);
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result.Add(0x03);
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result.Add(0x11);
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result.Add(0x00);
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result.Add(0x3f);
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result.Add(0x00);
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return result.ToArray();
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}
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// The default 'luma' and 'chroma' quantizer tables, in zigzag order:
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static byte[] defaultQuantizers = new byte[]
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{
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// luma table:
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16, 11, 12, 14, 12, 10, 16, 14,
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13, 14, 18, 17, 16, 19, 24, 40,
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26, 24, 22, 22, 24, 49, 35, 37,
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29, 40, 58, 51, 61, 60, 57, 51,
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56, 55, 64, 72, 92, 78, 64, 68,
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87, 69, 55, 56, 80, 109, 81, 87,
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95, 98, 103, 104, 103, 62, 77, 113,
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121, 112, 100, 120, 92, 101, 103, 99,
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// chroma table:
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17, 18, 18, 24, 21, 24, 47, 26,
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26, 47, 99, 66, 56, 66, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99
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};
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/// <summary>
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/// Creates a Luma and Chroma Table using the default quantizer
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/// </summary>
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/// <param name="Q">The quality</param>
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/// <returns>64 luma bytes and 64 chroma</returns>
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static byte[] CreateQuantizationTables(uint Q)
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{
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int factor = (int)Q;
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int q;
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if (Q < 1) factor = 1;
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else if (Q > 99) factor = 99;
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if (Q < 50)
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{
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q = 5000 / factor;
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}
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else
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{
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q = 200 - factor * 2;
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}
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byte[] resultTables = new byte[128];
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for (int i = 0; i < 128; ++i)
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{
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int newVal = (defaultQuantizers[i] * q + 50) / 100;
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if (newVal < 1) newVal = 1;
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else if (newVal > 255) newVal = 255;
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resultTables[i] = (byte)newVal;
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}
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return resultTables;
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}
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static byte[] CreateQuantizationTablesMarker(ArraySegment<byte> tables)
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{
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List<byte> result = new List<byte>();
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int tableSize = tables.Count / 2;
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//Luma
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result.Add(0xff);
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result.Add(0xdb);
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result.Add(0x00);
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result.Add((byte)(tableSize + 3));
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result.Add(0x00);
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for (int i = 0, e = tableSize; i < e; ++i)
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{
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result.Add(tables.Array[tables.Offset + i]);
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}
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//Chroma
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result.Add(0xff);
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result.Add(0xdb);
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result.Add(0x00);
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result.Add((byte)(tableSize + 3));
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result.Add(0x01);
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for (int i = tableSize, e = tables.Count; i < e; ++i)
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{
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result.Add(tables.Array[tables.Offset + i]);
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}
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return result.ToArray();
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}
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static byte[] lum_dc_codelens = { 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };
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static byte[] lum_dc_symbols = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
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static byte[] lum_ac_codelens = { 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d, };
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static byte[] lum_ac_symbols = {
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0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
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0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
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0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
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0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
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0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
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0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
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0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
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0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
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0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
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0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
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0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
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0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
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0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
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0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
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0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
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0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
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0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
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0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
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0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
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0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
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0xf9, 0xfa,
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};
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static byte[] chm_dc_codelens = { 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };
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static byte[] chm_dc_symbols = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
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static byte[] chm_ac_codelens = { 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };
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static byte[] chm_ac_symbols = {
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0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
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0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
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0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
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0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
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0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
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0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
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0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
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0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
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0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
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0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
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0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
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0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
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0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
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0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
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0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
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0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
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0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
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0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
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0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
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0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
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0xf9, 0xfa,
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};
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static byte[] CreateHuffmanTableMarker(byte[] codeLens, byte[] symbols, int tableNo, int tableClass)
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{
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List<byte> result = new List<byte>();
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result.Add(0xff);
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result.Add(0xc4);
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result.Add(0x00);
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result.Add((byte)(3 + codeLens.Length + symbols.Length));
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result.Add((byte)((tableClass << 4) | tableNo));
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result.AddRange(codeLens);
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result.AddRange(symbols);
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return result.ToArray();
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}
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static byte[] CreateDataRestartIntervalMarker(uint dri)
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{
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return new byte[] { 0xff, 0xdd, 0x00, 0x04, (byte)(dri >> 8), (byte)(dri) };
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}
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#endregion
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public JpegFrame() : base(26) { }
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/// <summary>
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/// //Writes the packets to a memory stream and created the default header and quantization tables if necessary.
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/// </summary>
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void ProcessPackets(System.IO.MemoryStream buffer)
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{
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ArraySegment<byte> tables = default(ArraySegment<byte>);
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uint FragmentOffset, TypeSpecific, Type, Quality, Width, Height, DataRestartInterval = 0;
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for (int i = 0, e = this.Packets.Count, last = e - 1; i < e; ++i)
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{
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int offset = 0;
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RtpPacket packet = this.Packets[i];
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TypeSpecific = (uint)(packet.Payload[offset++]);
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//FragmentOffset = (uint)(packet.Payload[offset++] | packet.Payload[offset++] << 8 | packet.Payload[offset++] << 16);
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FragmentOffset = (uint)(packet.Payload[offset++] << 16 | packet.Payload[offset++] << 8 | packet.Payload[offset++]);
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//Ensure start packet
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if (i == 0 && FragmentOffset != 0) continue;
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Type = (uint)(packet.Payload[offset++]);
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Quality = (uint)packet.Payload[offset++];
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Width = (uint)(packet.Payload[offset++] * 8);
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Height = (uint)(packet.Payload[offset++] * 8);
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//Only occur in the first packet
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if (FragmentOffset == 0)
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{
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//If There is already a StartOfInformation present just copy
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if (packet.Payload[offset] == 0xff && packet.Payload[offset + 1] == 0xd8)
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{
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goto WritePacket;
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}
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//Get the restart interval is present
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if (Type > 63)
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{
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DataRestartInterval = (uint)(packet.Payload[offset++] << 8 | packet.Payload[offset++]);
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}
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//Get the Q Tables if present
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if (Quality > 127)
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{
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uint MBZ = (uint)(packet.Payload[offset++]);//Should only proceed if MBZ > 0?
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uint Precision = (uint)(packet.Payload[offset++]);//Wasted read
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uint Length = (uint)(packet.Payload[offset++] << 8 | packet.Payload[offset++]);
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if(Length > 0)
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{
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tables = new ArraySegment<byte>(packet.Payload, offset, (int)Length);
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offset += (int)Length;
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}
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else
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{
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tables = new ArraySegment<byte>(CreateQuantizationTables(Quality));
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}
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}
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//Write the header to the buffer
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byte[] header = CreateJFIFHeader(Type, Width, Height, tables, DataRestartInterval);
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buffer.Write(header, 0, header.Length);
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}
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WritePacket: //Copy rest of data to buffer
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buffer.Write(packet.Payload, offset, packet.Payload.Length - offset);
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//Check to see if EOI is present or needs to be added on the last packet
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if (i == last && packet.Payload[packet.Payload.Length - 2] != 0xff && packet.Payload[packet.Payload.Length - 1] != 0xd9)
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{
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buffer.WriteByte(0xff);
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buffer.WriteByte(0xd9);
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}
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}
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//Go back to the beginning
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buffer.Seek(0, System.IO.SeekOrigin.Begin);
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}
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/// <summary>
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/// Creates a image from the processed packets in the memory stream
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/// </summary>
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/// <returns>The image created from the packets</returns>
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public System.Drawing.Image ToImage()
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{
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try
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{
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using (System.IO.MemoryStream buffer = new System.IO.MemoryStream())
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{
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ProcessPackets(buffer);
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return System.Drawing.Image.FromStream(buffer, false, true);
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}
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}
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catch (Exception exc)
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{
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log.ErrorFormat("Exception in ToImage(): {0}", exc.Message);
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return null;
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}
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}
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}
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}
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