jcparam_large_ac_huff.c

JPEG Image compression using IJG standards followed

/*  Jie: 07/04/00: Added supported for binDCT coef:
	added symbol for 0x0B and 0x0C with base-code length of 15 bits. This is inserted after the 37th symbol.

Side Effect:
***********
    But the numer of 16-bit codes are thus reduced by 4. previous: 65410-65534, now: 65414-65534.
	
	This is the base-code generated by the jpeg_make_c_derived_tbl() in jchuff.c is done in a loop.
	In the original code, there is no code of 13 and 14 bits, so the start 15-bit code is 32704,
	after generated the 1 15-bit code, the start code for 16-bit codee becomes 65410: (32704+1)x2.

	Now after adding 2 15-bit codes, the start of 16-bit codes becomes (32704+2+1)x2 = 65414.
	To prevent overflow, we have to drop the last 4 codes, corresponding to 0xF7, F8, F9, FA
	in the 2D statistical table. Which means that if there are 15 zeros followed by data in Cat. 7, 8, 9 or A,
	the data will not be encoded.

Jie:07/06/00:
    Design new Huff table for lossless binDCT:
*/

  /*
    static const UINT8 bits_ac_luminance[17] =
    { 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 3, 0x79 };

  static const UINT8 val_ac_luminance[] =
    { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
      0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
      0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
      0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
      0x24, 0x33, 0x62, 0x72, 0x82, 0x0B, 0x0C, 0x09, 0x0a, 0x16,
      0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
      0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
      0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
      0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
      0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
      0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
      0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
      0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
      0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
      0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
      0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
      0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
      0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
      0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
      0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6 };