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  1. /*
  2.  * MJPEG encoder and decoder
  3.  * Copyright (c) 2000, 2001 Fabrice Bellard
  4.  * Copyright (c) 2003 Alex Beregszaszi
  5.  * Copyright (c) 2003-2004 Michael Niedermayer
  6.  *
  7.  * Support for external huffman table, various fixes (AVID workaround),
  8.  * aspecting, new decode_frame mechanism and apple mjpeg-b support
  9.  *                                  by Alex Beregszaszi
  10.  *
  11.  * This file is part of FFmpeg.
  12.  *
  13.  * FFmpeg is free software; you can redistribute it and/or
  14.  * modify it under the terms of the GNU Lesser General Public
  15.  * License as published by the Free Software Foundation; either
  16.  * version 2.1 of the License, or (at your option) any later version.
  17.  *
  18.  * FFmpeg is distributed in the hope that it will be useful,
  19.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21.  * Lesser General Public License for more details.
  22.  *
  23.  * You should have received a copy of the GNU Lesser General Public
  24.  * License along with FFmpeg; if not, write to the Free Software
  25.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  26.  */
  27.  
  28. /**
  29.  * @file
  30.  * MJPEG encoder and decoder.
  31.  */
  32.  
  33. #include "mjpeg.h"
  34.  
  35.  
  36. #if 0
  37. /* These are the sample quantization tables given in JPEG spec section K.1.
  38.  * The spec says that the values given produce "good" quality, and
  39.  * when divided by 2, "very good" quality.
  40.  */
  41. static const unsigned char std_luminance_quant_tbl[64] = {
  42.     16,  11,  10,  16,  24,  40,  51,  61,
  43.     12,  12,  14,  19,  26,  58,  60,  55,
  44.     14,  13,  16,  24,  40,  57,  69,  56,
  45.     14,  17,  22,  29,  51,  87,  80,  62,
  46.     18,  22,  37,  56,  68, 109, 103,  77,
  47.     24,  35,  55,  64,  81, 104, 113,  92,
  48.     49,  64,  78,  87, 103, 121, 120, 101,
  49.     72,  92,  95,  98, 112, 100, 103,  99
  50. };
  51. static const unsigned char std_chrominance_quant_tbl[64] = {
  52.     17,  18,  24,  47,  99,  99,  99,  99,
  53.     18,  21,  26,  66,  99,  99,  99,  99,
  54.     24,  26,  56,  99,  99,  99,  99,  99,
  55.     47,  66,  99,  99,  99,  99,  99,  99,
  56.     99,  99,  99,  99,  99,  99,  99,  99,
  57.     99,  99,  99,  99,  99,  99,  99,  99,
  58.     99,  99,  99,  99,  99,  99,  99,  99,
  59.     99,  99,  99,  99,  99,  99,  99,  99
  60. };
  61. #endif
  62.  
  63. /* Set up the standard Huffman tables (cf. JPEG standard section K.3) */
  64. /* IMPORTANT: these are only valid for 8-bit data precision! */
  65. const uint8_t avpriv_mjpeg_bits_dc_luminance[17] =
  66. { /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };
  67. const uint8_t avpriv_mjpeg_val_dc[12] =
  68. { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
  69.  
  70. const uint8_t avpriv_mjpeg_bits_dc_chrominance[17] =
  71. { /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };
  72.  
  73. const uint8_t avpriv_mjpeg_bits_ac_luminance[17] =
  74. { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };
  75. const uint8_t avpriv_mjpeg_val_ac_luminance[] =
  76. { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
  77.   0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
  78.   0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
  79.   0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
  80.   0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
  81.   0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
  82.   0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
  83.   0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
  84.   0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
  85.   0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
  86.   0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
  87.   0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
  88.   0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
  89.   0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
  90.   0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
  91.   0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
  92.   0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
  93.   0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
  94.   0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
  95.   0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
  96.   0xf9, 0xfa
  97. };
  98.  
  99. const uint8_t avpriv_mjpeg_bits_ac_chrominance[17] =
  100. { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };
  101.  
  102. const uint8_t avpriv_mjpeg_val_ac_chrominance[] =
  103. { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
  104.   0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
  105.   0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
  106.   0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
  107.   0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
  108.   0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
  109.   0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
  110.   0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
  111.   0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
  112.   0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
  113.   0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
  114.   0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
  115.   0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
  116.   0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
  117.   0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
  118.   0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
  119.   0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
  120.   0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
  121.   0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
  122.   0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
  123.   0xf9, 0xfa
  124. };
  125.  
  126. /* isn't this function nicer than the one in the libjpeg ? */
  127. void ff_mjpeg_build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code,
  128.                                   const uint8_t *bits_table,
  129.                                   const uint8_t *val_table)
  130. {
  131.     int i, j, k,nb, code, sym;
  132.  
  133.     code = 0;
  134.     k = 0;
  135.     for(i=1;i<=16;i++) {
  136.         nb = bits_table[i];
  137.         for(j=0;j<nb;j++) {
  138.             sym = val_table[k++];
  139.             huff_size[sym] = i;
  140.             huff_code[sym] = code;
  141.             code++;
  142.         }
  143.         code <<= 1;
  144.     }
  145. }
  146.