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1 /*
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2 * Small jpeg decoder library (Internal header)
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3 *
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4 * Copyright (c) 2006, Luc Saillard <luc@saillard.org>
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5 * All rights reserved.
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * - Redistributions of source code must retain the above copyright notice,
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10 * this list of conditions and the following disclaimer.
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11 *
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12 * - Redistributions in binary form must reproduce the above copyright notice,
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13 * this list of conditions and the following disclaimer in the documentation
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14 * and/or other materials provided with the distribution.
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15 *
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16 * - Neither the name of the author nor the names of its contributors may be
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17 * used to endorse or promote products derived from this software without
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18 * specific prior written permission.
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19 *
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20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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30 * POSSIBILITY OF SUCH DAMAGE.
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31 *
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32 */
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33
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34 #ifndef __TINYJPEG_INTERNAL_H_
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35 #define __TINYJPEG_INTERNAL_H_
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36
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37 #define SANITY_CHECK 1
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38
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39 struct jdec_private;
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40
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41 #define HUFFMAN_BITS_SIZE 256
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42 #define HUFFMAN_HASH_NBITS 9
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43 #define HUFFMAN_HASH_SIZE (1UL<<HUFFMAN_HASH_NBITS)
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44 #define HUFFMAN_HASH_MASK (HUFFMAN_HASH_SIZE-1)
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45
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46 #define HUFFMAN_TABLES 4
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47 #define COMPONENTS 3
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48
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49 #define cY 0
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50 #define cCb 1
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51 #define cCr 2
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52
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53 #define BLACK_Y 0
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54 #define BLACK_U 127
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55 #define BLACK_V 127
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56
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57 #if DEBUG
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58 #define trace(fmt, args...) do { \
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59 fprintf(stderr, fmt, ## args); \
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60 fflush(stderr); \
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61 } while(0)
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62 #else
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63 #define trace(fmt, args...) do { } while (0)
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64 #endif
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65 #define error(fmt, args...) do { \
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66 snprintf(error_string, sizeof(error_string), fmt, ## args); \
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67 return -1; \
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68 } while(0)
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69
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70 #define be16_to_cpu(x) (((x)[0]<<8)|(x)[1])
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71
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72 enum std_markers {
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73 DQT = 0xDB, /* Define Quantization Table */
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74 SOF = 0xC0, /* Start of Frame (size information) */
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75 DHT = 0xC4, /* Huffman Table */
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76 SOI = 0xD8, /* Start of Image */
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77 SOS = 0xDA, /* Start of Scan */
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78 RST = 0xD0, /* Reset Marker d0 -> .. */
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79 RST7 = 0xD7, /* Reset Marker .. -> d7 */
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80 EOI = 0xD9, /* End of Image */
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81 DRI = 0xDD, /* Define Restart Interval */
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82 APP0 = 0xE0,
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83 };
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84
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85 struct huffman_table
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86 {
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87 /* Fast look up table, using HUFFMAN_HASH_NBITS bits we can have directly the symbol,
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88 * if the symbol is <0, then we need to look into the tree table */
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89 short int lookup[HUFFMAN_HASH_SIZE];
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90 /* code size: give the number of bits of a symbol is encoded */
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91 unsigned char code_size[HUFFMAN_HASH_SIZE];
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92 /* some place to store value that is not encoded in the lookup table */
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93 uint16_t slowtable[16-HUFFMAN_HASH_NBITS][256];
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94 };
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95
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96 struct component
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97 {
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98 unsigned int Hfactor;
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99 unsigned int Vfactor;
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100 float *Q_table; /* Pointer to the quantisation table to use */
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101 struct huffman_table *AC_table;
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102 struct huffman_table *DC_table;
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103 short int previous_DC; /* Previous DC coefficient */
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104 short int DCT[64]; /* DCT coef */
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105 #if SANITY_CHECK
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106 unsigned int cid;
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107 #endif
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108 };
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109
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110 typedef int (*decode_MCU_fct) (struct jdec_private *priv);
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111 typedef void (*convert_colorspace_fct) (struct jdec_private *priv);
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112
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113 struct jdec_private
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114 {
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115 /* Public variables */
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116 uint8_t *components[COMPONENTS];
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117 unsigned int width, height; /* Size of the image */
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118 unsigned int mcus_in_width, mcus_in_height;
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119 unsigned int mcus_posx, mcus_posy;
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120 unsigned int flags;
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121
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122 /* Private variables */
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123 const unsigned char *stream_begin, *stream_end;
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124 unsigned int stream_length;
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125
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126 const unsigned char *stream; /* Pointer to the current stream */
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127 unsigned int reservoir, nbits_in_reservoir;
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128
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129 struct component component_infos[COMPONENTS];
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130 float Q_tables[COMPONENTS][64]; /* quantization tables */
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131 struct huffman_table HTDC[HUFFMAN_TABLES]; /* DC huffman tables */
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132 struct huffman_table HTAC[HUFFMAN_TABLES]; /* AC huffman tables */
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133 int default_huffman_table_initialized;
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134 unsigned int restart_interval;
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135 // int restarts_to_go; /* MCUs left in this restart interval */
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136 int last_rst_marker_seen; /* Rst marker is incremented each time */
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137
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138 /* Temp space used after the IDCT to store each components */
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139 uint8_t Y[64*4], Cr[64], Cb[64];
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140
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141 /* Internal Pointer use for colorspace conversion, do not modify it !!! */
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142 uint8_t *plane;
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143
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144 };
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145
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146 #if defined(__GNUC__) && (__GNUC__ > 3) && defined(__OPTIMIZE__)
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147 #define __likely(x) __builtin_expect(!!(x), 1)
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148 #define __unlikely(x) __builtin_expect(!!(x), 0)
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149 #else
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150 #define __likely(x) (x)
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151 #define __unlikely(x) (x)
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152 #endif
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153
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154 #define IDCT tinyjpeg_idct_float
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155 void tinyjpeg_idct_float (struct component *compptr, uint8_t *output_buf, int stride);
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156 int parse_JFIF(struct jdec_private *priv, const unsigned char *stream);
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157
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158 #endif
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159
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