libavcodec/mjpeg.c

   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 mjpeg.c
  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 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 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 ff_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 ff_mjpeg_val_dc_luminance[] =
  68 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
  69
  70 const uint8_t ff_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 const uint8_t ff_mjpeg_val_dc_chrominance[] =
  73 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
  74
  75 const uint8_t ff_mjpeg_bits_ac_luminance[17] =
  76 { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };
  77 const uint8_t ff_mjpeg_val_ac_luminance[] =
  78 { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
  79   0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
  80   0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
  81   0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
  82   0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
  83   0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
  84   0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
  85   0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
  86   0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
  87   0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
  88   0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
  89   0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
  90   0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
  91   0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
  92   0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
  93   0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
  94   0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
  95   0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
  96   0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
  97   0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
  98   0xf9, 0xfa
  99 };
 100
 101 const uint8_t ff_mjpeg_bits_ac_chrominance[17] =
 102 { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };
 103
 104 const uint8_t ff_mjpeg_val_ac_chrominance[] =
 105 { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
 106   0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
 107   0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
 108   0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
 109   0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
 110   0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
 111   0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
 112   0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
 113   0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
 114   0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
 115   0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
 116   0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
 117   0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
 118   0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
 119   0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
 120   0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
 121   0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
 122   0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
 123   0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
 124   0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
 125   0xf9, 0xfa
 126 };
 127
 128 /* isn't this function nicer than the one in the libjpeg ? */
 129 void ff_mjpeg_build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code,
 130                                   const uint8_t *bits_table,
 131                                   const uint8_t *val_table)
 132 {
 133     int i, j, k,nb, code, sym;
 134
 135     code = 0;
 136     k = 0;
 137     for(i=1;i<=16;i++) {
 138         nb = bits_table[i];
 139         for(j=0;j<nb;j++) {
 140             sym = val_table[k++];
 141             huff_size[sym] = i;
 142             huff_code[sym] = code;
 143             code++;
 144         }
 145         code <<= 1;
 146     }
 147 }