public void DecodeDCRefine(JPEGBinaryReader stream, float[] dest) { if (stream.ReadBits(1) == 1) { dest[0] = (int)dest[0] | (1 << successiveLow); } }
/// <summary> /// Generated from text on F-23, F.13 - Huffman decoded of AC coefficients /// on ISO DIS 10918-1. Requirements and Guidelines. /// </summary> internal void decode_ac_coefficients(JPEGBinaryReader JPEGStream, float[] zz) { for (int k = 1; k < 64; k++) { int s = ACTable.Decode(JPEGStream); int r = s >> 4; s &= 15; if (s != 0) { k += r; r = (int)JPEGStream.ReadBits(s); s = (int)HuffmanTable.Extend(r, s); zz[k] = s; } else { if (r != 15) { //throw new JPEGMarkerFoundException(); return; } k += 15; } } }
/// <summary> /// Generated from text on F-22, F.2.2.1 - Huffman decoding of DC /// coefficients on ISO DIS 10918-1. Requirements and Guidelines. /// </summary> /// <param name="JPEGStream">Stream that contains huffman bits</param> /// <returns>DC coefficient</returns> public float decode_dc_coefficient(JPEGBinaryReader JPEGStream) { int t = DCTable.Decode(JPEGStream); float diff = JPEGStream.ReadBits(t); diff = HuffmanTable.Extend((int)diff, t); diff = (previousDC + diff); previousDC = diff; return(diff); }
public void DecodeACFirst(JPEGBinaryReader stream, float[] zz) { if (stream.eob_run > 0) { stream.eob_run--; return; } for (int k = spectralStart; k <= spectralEnd; k++) { int s = ACTable.Decode(stream); int r = s >> 4; s &= 15; if (s != 0) { k += r; r = (int)stream.ReadBits(s); s = (int)HuffmanTable.Extend(r, s); zz[k] = s << successiveLow; } else { if (r != 15) { stream.eob_run = 1 << r; if (r != 0) { stream.eob_run += stream.ReadBits(r); } stream.eob_run--; break; } k += 15; } } }
/// <summary>Figure F.16 - Reads the huffman code bit-by-bit.</summary> public int Decode(JPEGBinaryReader JPEGStream) { int i = 0; short code = (short)JPEGStream.ReadBits(1); while (code > maxcode[i]) { i++; code <<= 1; code |= (short)JPEGStream.ReadBits(1); } int val = huffval[code + (valptr[i])]; if (val < 0) { val = 256 + val; } return(val); }
public void DecodeDCFirst(JPEGBinaryReader stream, float[] dest) { float[] datablock = new float[64]; int s = DCTable.Decode(stream); int r = stream.ReadBits(s); s = HuffmanTable.Extend(r, s); s = (int)previousDC + s; previousDC = s; dest[0] = s << successiveLow; }
/// <summary>Figure F.16 - Reads the huffman code bit-by-bit.</summary> public int Decode(JPEGBinaryReader JPEGStream) { int i = 0; short code = (short)JPEGStream.ReadBits(1); while (code > maxcode[i]) { i++; code <<= 1; code |= (short)JPEGStream.ReadBits(1); } int val = huffval[code + (valptr[i])]; if (val < 0) val = 256 + val; return val; }
/// <summary> /// Generated from text on F-23, F.13 - Huffman decoded of AC coefficients /// on ISO DIS 10918-1. Requirements and Guidelines. /// </summary> internal void decode_ac_coefficients(JPEGBinaryReader JPEGStream, float[] zz) { for (int k = 1; k < 64; k++) { int s = ACTable.Decode(JPEGStream); int r = s >> 4; s &= 15; if (s != 0) { k += r; r = (int)JPEGStream.ReadBits(s); s = (int)HuffmanTable.Extend(r, s); zz[k] = s; } else { if (r != 15) { //throw new JPEGMarkerFoundException(); return; } k += 15; } } }
/// <summary> /// Generated from text on F-22, F.2.2.1 - Huffman decoding of DC /// coefficients on ISO DIS 10918-1. Requirements and Guidelines. /// </summary> /// <param name="JPEGStream">Stream that contains huffman bits</param> /// <returns>DC coefficient</returns> public float decode_dc_coefficient(JPEGBinaryReader JPEGStream) { int t = DCTable.Decode(JPEGStream); float diff = JPEGStream.ReadBits(t); diff = HuffmanTable.Extend((int)diff, t); diff = (previousDC + diff); previousDC = diff; return diff; }
public void DecodeDCRefine(JPEGBinaryReader stream, float[] dest) { if (stream.ReadBits(1) == 1) { dest[0] = (int)dest[0] | (1 << successiveLow); } }
public void DecodeDCFirst(JPEGBinaryReader stream, float[] dest) { float[] datablock = new float[64]; int s = DCTable.Decode(stream); int r = stream.ReadBits(s); s = HuffmanTable.Extend(r, s); s = (int)previousDC + s; previousDC = s; dest[0] = s << successiveLow; }
public void DecodeACRefine(JPEGBinaryReader stream, float[] dest) { int p1 = 1 << successiveLow; int m1 = (-1) << successiveLow; int k = spectralStart; if (stream.eob_run == 0) for (; k <= spectralEnd; k++) { #region Decode and check S int s = ACTable.Decode(stream); int r = s >> 4; s &= 15; if (s != 0) { if (s != 1) throw new Exception("Decode Error"); if (stream.ReadBits(1) == 1) s = p1; else s = m1; } else { if (r != 15) { stream.eob_run = 1 << r; if (r > 0) stream.eob_run += stream.ReadBits(r); break; } } // if (s != 0) #endregion // Apply the update do { if (dest[k] != 0) { if (stream.ReadBits(1) == 1) { if (((int)dest[k] & p1) == 0) { if (dest[k] >= 0) dest[k] += p1; else dest[k] += m1; } } } else { if (--r < 0) break; } k++; } while (k <= spectralEnd); if( (s != 0) && k < 64) { dest[k] = s; } } // for k = start ... end if (stream.eob_run > 0) { for (; k <= spectralEnd; k++) { if (dest[k] != 0) { if (stream.ReadBits(1) == 1) { if (((int)dest[k] & p1) == 0) { if (dest[k] >= 0) dest[k] += p1; else dest[k] += m1; } } } } stream.eob_run--; } }
public void DecodeACFirst(JPEGBinaryReader stream, float[] zz) { if (stream.eob_run > 0) { stream.eob_run--; return; } for (int k = spectralStart; k <= spectralEnd; k++) { int s = ACTable.Decode(stream); int r = s >> 4; s &= 15; if (s != 0) { k += r; r = (int)stream.ReadBits(s); s = (int)HuffmanTable.Extend(r, s); zz[k] = s << successiveLow; } else { if (r != 15) { stream.eob_run = 1 << r; if (r != 0) stream.eob_run += stream.ReadBits(r); stream.eob_run--; break; } k += 15; } } }
public void DecodeACRefine(JPEGBinaryReader stream, float[] dest) { int p1 = 1 << successiveLow; int m1 = (-1) << successiveLow; int k = spectralStart; if (stream.eob_run == 0) { for (; k <= spectralEnd; k++) { #region Decode and check S int s = ACTable.Decode(stream); int r = s >> 4; s &= 15; if (s != 0) { if (s != 1) { throw new Exception("Decode Error"); } if (stream.ReadBits(1) == 1) { s = p1; } else { s = m1; } } else { if (r != 15) { stream.eob_run = 1 << r; if (r > 0) { stream.eob_run += stream.ReadBits(r); } break; } } // if (s != 0) #endregion // Apply the update do { if (dest[k] != 0) { if (stream.ReadBits(1) == 1) { if (((int)dest[k] & p1) == 0) { if (dest[k] >= 0) { dest[k] += p1; } else { dest[k] += m1; } } } } else { if (--r < 0) { break; } } k++; } while (k <= spectralEnd); if ((s != 0) && k < 64) { dest[k] = s; } } // for k = start ... end } if (stream.eob_run > 0) { for (; k <= spectralEnd; k++) { if (dest[k] != 0) { if (stream.ReadBits(1) == 1) { if (((int)dest[k] & p1) == 0) { if (dest[k] >= 0) { dest[k] += p1; } else { dest[k] += m1; } } } } } stream.eob_run--; } }