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 libavcodec/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[12] =
  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
  73 const uint8_t ff_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 ff_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 ff_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 ff_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 }