1 | //////////////////////////////////////////////////////////////////////////////////////// |
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2 | // File : vld.c |
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3 | // Date : octobre 2015 |
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4 | // author : Alain Greiner |
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5 | //////////////////////////////////////////////////////////////////////////////////////// |
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6 | // This file define the code of the VLD (Variable Length Decoder) thread for the MJPEG |
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7 | // application. This function makes the analysis of the variable length bit stream, |
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8 | // resulting from the Huffman entropy coder. |
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9 | // For each image: |
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10 | // - It read the Huffman Table parameters from the <in_huff> MWMR channel. |
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11 | // - It read the bit stream from the <in_data> MWMR channel. |
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12 | // - It write output pixels (two bytes per pixel) to the <out> MWMR channel. |
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13 | // It uses MWMR_BUFIO buffers for the input channels, but not for the output channel. |
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14 | //////////////////////////////////////////////////////////////////////////////////////// |
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15 | |
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16 | #include <stdio.h> |
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17 | #include <stdint.h> |
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18 | #include <mwmr_channel.h> |
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19 | #include "mjpeg.h" |
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20 | |
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21 | #define HUFF_EOB 0x00 |
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22 | #define HUFF_ZRL 0xF0 |
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23 | |
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24 | // macro to use a shared TTY |
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25 | #define PRINTF(...) do { lock_acquire( &tty_lock ); \ |
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26 | giet_tty_printf(__VA_ARGS__); \ |
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27 | lock_release( &tty_lock ); } while(0); |
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28 | |
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29 | //////////////////////////////////////////////////////////////////////////////////////// |
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30 | // bitreader_t : data structure and access functions to analyse a bit-stream. |
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31 | //////////////////////////////////////////////////////////////////////////////////////// |
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32 | |
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33 | typedef struct |
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34 | { |
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35 | mwmr_bufio_t* bufio; // associated bufio |
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36 | uint8_t current; // temporary buffer of one byte |
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37 | uint8_t available; // number of bits to read in current byte |
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38 | } bitreader_t; |
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39 | |
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40 | //////////////////////////////////////////////////// |
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41 | // returns <number> bits from the associated bufio. |
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42 | //////////////////////////////////////////////////// |
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43 | uint32_t bitreader_get( bitreader_t* stream, |
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44 | uint32_t number ) |
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45 | { |
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46 | uint32_t ret = 0; |
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47 | |
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48 | giet_pthread_assert( (number <= 16) , |
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49 | "ERROR in bitreader_get() : illegal number argument"); |
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50 | |
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51 | if (stream->available) |
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52 | { |
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53 | stream->current &= (1<<stream->available)-1; |
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54 | } |
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55 | |
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56 | while (number) |
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57 | { |
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58 | if ( stream->available == 0 ) // current buffer empty => refill |
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59 | { |
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60 | stream->current = mwmr_bufio_read_byte( stream->bufio ); |
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61 | stream->available = 8; |
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62 | } |
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63 | if ( number == stream->available ) |
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64 | { |
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65 | stream->available = 0; |
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66 | ret = (ret<<number) | stream->current; |
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67 | break; |
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68 | } |
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69 | if ( number < stream->available ) |
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70 | { |
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71 | ret = (ret<<number) | (stream->current>>(stream->available-number)); |
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72 | stream->available -= number; |
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73 | break; |
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74 | } |
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75 | if ( number > stream->available ) |
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76 | { |
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77 | ret = (ret<<stream->available) | stream->current; |
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78 | number -= stream->available; |
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79 | stream->available = 0; |
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80 | } |
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81 | } |
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82 | |
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83 | return ret; |
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84 | } |
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85 | |
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86 | /////////////////////////////////////////////// |
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87 | // returns one bit from the associated bufio. |
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88 | /////////////////////////////////////////////// |
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89 | uint8_t bitreader_get_one( bitreader_t* stream ) |
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90 | { |
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91 | if ( stream->available == 0 ) // current buffer empty => refill |
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92 | { |
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93 | stream->current = mwmr_bufio_read_byte( stream->bufio ); |
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94 | stream->available = 7; |
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95 | } |
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96 | else |
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97 | { |
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98 | --(stream->available); |
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99 | } |
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100 | |
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101 | uint32_t tmp = 1<<(stream->available); |
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102 | |
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103 | return ( !!(stream->current & tmp) ); |
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104 | } |
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105 | |
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106 | ///////////////////////////////////////// |
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107 | void bitreader_init( bitreader_t* stream, |
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108 | mwmr_bufio_t* bufio ) |
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109 | { |
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110 | stream->available = 0; |
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111 | stream->current = 0; |
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112 | stream->bufio = bufio; |
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113 | } |
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114 | |
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115 | ////////////////////////////////////////////////////////////////////////////////////////// |
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116 | // data structures and access functions for the Huffman tables |
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117 | // - We have two tables (DC and AC), and 16 possible code lengths (from 1 to 16). |
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118 | // - DC_Table[12] : 12 possible symbol values for the DC Table. |
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119 | // - AC_Table[162] : 162 possible symbol values for the AC Table. |
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120 | // - ValPtr[t][l] : index in Table <t> for the first code of length <l> |
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121 | // - MinCode[t][l] : min value for codes of length <l> |
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122 | // - MaxCode[t][l] : max value for codes of length <l> / (-1) if no code of length <l> |
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123 | ////////////////////////////////////////////////////////////////////////////////////////// |
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124 | |
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125 | typedef struct |
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126 | { |
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127 | uint8_t* HT[2]; // HT[0] == DC_Table / HT[1] == AC_Table |
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128 | int32_t MinCode[2][16]; // two types of tables / 16 code lengths |
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129 | int32_t MaxCode[2][16]; // two types of tables / 16 code lengths |
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130 | int32_t ValPtr[2][16]; // two types of tables / 16 code lengths |
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131 | uint8_t DC_Table[12]; // at most 12 values |
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132 | uint8_t AC_Table[162]; // at most 162 values |
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133 | } huff_tables_t; |
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134 | |
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135 | ///////////////////////////////////////////// |
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136 | void huff_tables_init( huff_tables_t* huff ) |
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137 | { |
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138 | int32_t i, j; |
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139 | |
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140 | for ( j=0; j<16; ++j ) |
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141 | { |
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142 | for ( i=0; i<2; ++i ) |
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143 | { |
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144 | huff->MinCode[i][j] = 0; |
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145 | huff->MaxCode[i][j] = 0; |
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146 | huff->ValPtr[i][j] = 0; |
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147 | } |
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148 | } |
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149 | |
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150 | for ( i=0; i<14; ++i ) huff->DC_Table[i] = 0; |
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151 | |
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152 | for ( i=0; i<162; ++i ) huff->AC_Table[i] = 0; |
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153 | |
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154 | huff->HT[0] = huff->DC_Table; |
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155 | huff->HT[1] = huff->AC_Table; |
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156 | } |
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157 | |
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158 | //////////////////////////////////////////// |
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159 | void huff_tables_dump( huff_tables_t* huff, |
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160 | uint32_t is_ac ) |
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161 | { |
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162 | uint32_t j; |
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163 | int32_t code; |
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164 | |
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165 | uint32_t max = ( is_ac ) ? 162 : 12; |
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166 | uint32_t type = ( is_ac ) ? 1 : 0; |
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167 | |
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168 | if ( is_ac ) |
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169 | { |
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170 | PRINTF("\n AC Huffman Table\n\n"); |
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171 | } |
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172 | else |
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173 | { |
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174 | PRINTF("\n DC Huffman Table\n\n"); |
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175 | } |
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176 | |
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177 | for ( j = 0; j < 16; j++ ) // j = code_length - 1 |
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178 | { |
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179 | PRINTF(" length = %d / mincode = %x / maxcode = %x / valptr = %d\n", |
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180 | j+1 , huff->MinCode[type][j] , huff->MaxCode[type][j] , huff->ValPtr[type][j]); |
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181 | } |
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182 | |
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183 | PRINTF("\n"); |
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184 | |
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185 | for ( j = 0 ; j < 16 ; j++ ) // j == code_length - 1 |
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186 | { |
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187 | for ( code = huff->MinCode[type][j] ; code <= huff->MaxCode[type][j] ; code++ ) |
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188 | { |
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189 | uint32_t index = huff->ValPtr[type][j] + code - huff->MinCode[type][j]; |
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190 | |
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191 | giet_pthread_assert( (index<max) , "ERROR in huff_tables_dump() : overflow"); |
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192 | |
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193 | PRINTF(" Symbol[%d] = %x / code[%d] = %x\n", |
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194 | index , huff->HT[type][index] , index , code ); |
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195 | } |
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196 | } |
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197 | |
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198 | PRINTF("\n"); |
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199 | } |
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200 | |
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201 | ///////////////////////////////////////////// |
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202 | void huff_tables_load( uint32_t index, |
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203 | huff_tables_t* huff, |
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204 | mwmr_bufio_t* bufio ) |
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205 | { |
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206 | uint8_t byte; |
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207 | uint32_t is_ac; // AC Table if non zero |
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208 | |
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209 | uint8_t LeavesN; // number of codes of length N (from 1 to 16) |
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210 | uint8_t LeavesT; // cumulated total number of codes |
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211 | uint32_t AuxCode; // used to compute code values |
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212 | |
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213 | // read length (2 bytes) from bufio |
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214 | uint32_t length = (uint32_t)mwmr_bufio_read_byte( bufio ); |
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215 | length = (length<<8) | mwmr_bufio_read_byte( bufio ); |
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216 | |
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217 | // read Tc/Th (1 byte) from bufio |
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218 | // Th must be null, Tc must be 0 or 1 |
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219 | byte = mwmr_bufio_read_byte( bufio ); |
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220 | |
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221 | giet_pthread_assert( ((byte & 0xEF) == 0) , |
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222 | "ERROR in huff_load_table() : non supported HT header"); |
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223 | |
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224 | if (byte == 0) is_ac = 0; |
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225 | else is_ac = 1; |
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226 | |
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227 | uint32_t max_size = ( is_ac ) ? 162 : 12; |
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228 | |
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229 | // get the 16 LeavesN values from bufio |
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230 | uint32_t i; |
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231 | LeavesT = 0; |
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232 | AuxCode = 0; |
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233 | for ( i=0; i<16; i++ ) |
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234 | { |
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235 | // read one byte from bufio |
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236 | LeavesN = mwmr_bufio_read_byte( bufio ); |
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237 | |
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238 | huff->ValPtr[is_ac][i] = LeavesT; |
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239 | huff->MinCode[is_ac][i] = AuxCode<<1; |
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240 | AuxCode = huff->MinCode[is_ac][i] + LeavesN; |
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241 | huff->MaxCode[is_ac][i] = (LeavesN) ? (AuxCode - 1) : (-1); |
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242 | LeavesT += LeavesN; |
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243 | } |
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244 | |
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245 | giet_pthread_assert( (length == 19 + LeavesT) , |
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246 | "ERROR in huff_load_table() : illegal HT length"); |
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247 | |
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248 | giet_pthread_assert( (LeavesT <= max_size) , |
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249 | "ERROR in huff_load_table() : too much symbols"); |
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250 | |
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251 | // get the symbol values from bufio (one byte per symbol) |
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252 | // complete table with zero values if LeavesT < max_size |
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253 | for ( i=0 ; i<max_size ; ++i ) |
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254 | { |
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255 | if ( i < LeavesT ) huff->HT[is_ac][i] = mwmr_bufio_read_byte( bufio ); |
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256 | else huff->HT[is_ac][i] = 0; |
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257 | } |
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258 | |
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259 | // align bufio pointer on next item |
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260 | mwmr_bufio_align( bufio ); |
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261 | |
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262 | #if (DEBUG_VLD > 3) |
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263 | if ( (index == DEBUG_CLUSTER_INDEX) || (DEBUG_CLUSTER_INDEX == 0XFFFFFFFF) ) |
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264 | huff_tables_dump( huff , is_ac ); |
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265 | #endif |
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266 | |
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267 | } // end huff_tables_load() |
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268 | |
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269 | ////////////////////////////////////////////////////////// |
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270 | // extract a symbol (8 bits) from an Huffman encoded |
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271 | // bit-stream, using the specified huffman table |
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272 | ///////////////////////////////////////////////////////// |
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273 | int8_t huff_get_symbol( bitreader_t* stream, |
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274 | huff_tables_t* huff, |
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275 | int32_t select ) // DC if zero / AC if non zero |
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276 | { |
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277 | uint32_t length; |
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278 | int32_t code = 0; |
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279 | |
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280 | uint32_t is_ac = (select) ? 1 : 0; |
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281 | uint32_t max_size = (select) ? 162 : 12; |
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282 | |
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283 | for ( length = 0 ; length < 16 ; ++length ) |
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284 | { |
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285 | code = (code<<1) | bitreader_get_one( stream ); |
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286 | if ( code <= huff->MaxCode[select][length] ) break; |
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287 | } |
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288 | |
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289 | uint32_t index = huff->ValPtr[is_ac][length] + code - huff->MinCode[is_ac][length]; |
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290 | |
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291 | giet_pthread_assert( (index <= max_size) , |
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292 | "ERROR in huff_get_symbol() : Huffman table overflow"); |
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293 | |
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294 | return huff->HT[is_ac][index]; |
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295 | } |
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296 | |
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297 | /////////////////////////////////////////////////////////////////////////// |
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298 | // transform JPEG encoded positive/negative value coded as ( S , nbits ) |
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299 | // to a standard 16 bits 2's complement number (int16_t). |
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300 | // - nbits is the magnitude (number of significant bits in S |
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301 | // - most significant bit in S is 0 for positive / 1 for negative |
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302 | // - other bits in S define the value in 2**(nbits-1) possible values |
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303 | /////////////////////////////////////////////////////////////////////////// |
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304 | static int16_t reformat( uint32_t S , int32_t nbits ) |
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305 | { |
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306 | uint32_t ext; |
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307 | uint32_t sign; |
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308 | int16_t value; |
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309 | |
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310 | if ( nbits == 0 ) return 0; |
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311 | |
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312 | sign = !( (1 << (nbits - 1)) & S ); |
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313 | ext = 0 - (sign << nbits); |
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314 | value = (S | ext) + sign; |
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315 | |
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316 | return value; |
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317 | } |
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318 | |
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319 | //////////////////////////////////////////////////////// |
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320 | // unpack a 8*8 pixels block with 2 bytes per pixel |
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321 | ////////////////////////////////////////////////////////// |
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322 | static int16_t vld_unpack_block( uint32_t index, // cluster index |
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323 | uint32_t image, // image index |
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324 | uint32_t block, // block index |
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325 | bitreader_t* stream, // input bit stream |
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326 | mwmr_channel_t* mwmr_out, // output channel |
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327 | huff_tables_t* huff, // Huffman Tables |
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328 | int16_t prev_dc ) // previous DC coef |
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329 | { |
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330 | uint32_t temp; |
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331 | uint32_t i; |
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332 | uint32_t run; |
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333 | uint32_t cat; |
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334 | int32_t value; |
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335 | uint8_t symbol; |
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336 | int16_t buf[64]; // buffer for the 64 resulting pixels (2 bytes per pixel) |
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337 | |
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338 | // set default values |
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339 | for (i = 0; i < 64; i++) buf[i] = 0; |
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340 | |
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341 | // compute the DC coefficient |
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342 | symbol = huff_get_symbol( stream , huff , 0 ); // use DC Huffman Table |
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343 | |
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344 | temp = bitreader_get( stream , symbol ); |
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345 | value = reformat( temp , symbol ); |
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346 | buf[0] = value + prev_dc; |
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347 | |
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348 | #if (DEBUG_VLD > 2) |
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349 | if ( (index == DEBUG_CLUSTER_INDEX) || (DEBUG_CLUSTER_INDEX == 0XFFFFFFFF) ) |
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350 | PRINTF("\nVLD[%d] : DC[0] = %d / reformat( %x , %d ) = %d\n", |
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351 | index , buf[0], temp , symbol , value ); |
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352 | #endif |
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353 | |
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354 | // compute the 63 AC coefficients |
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355 | for (i = 1; i < 64; i++) |
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356 | { |
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357 | symbol = huff_get_symbol( stream , huff , 1 ); // use AC Huffman Table |
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358 | |
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359 | // in case of HUFF_EOB symbol, all other pixels are zero |
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360 | if ( symbol == HUFF_EOB ) |
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361 | { |
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362 | |
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363 | #if (DEBUG_VLD > 2) |
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364 | if ( (index == DEBUG_CLUSTER_INDEX) || (DEBUG_CLUSTER_INDEX == 0XFFFFFFFF) ) |
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365 | PRINTF("\nVLD[%d] : EOB found at i = %d\n", index , i ); |
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366 | #endif |
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367 | break; |
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368 | } |
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369 | |
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370 | // in case of HUFF_ZRL symbol (0xF0) , 15 next pixels are zero |
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371 | if (symbol == HUFF_ZRL) |
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372 | { |
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373 | i += 15; |
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374 | continue; |
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375 | } |
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376 | |
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377 | cat = symbol & 0xf; |
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378 | run = symbol >> 4; |
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379 | i += run; |
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380 | |
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381 | temp = bitreader_get (stream , cat ); |
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382 | value = reformat( temp , cat ); |
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383 | buf[i] = value; |
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384 | |
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385 | #if (DEBUG_VLD > 2) |
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386 | if ( (index == DEBUG_CLUSTER_INDEX) || (DEBUG_CLUSTER_INDEX == 0XFFFFFFFF) ) |
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387 | PRINTF("\nVLD[%d] : AC[%d] = %d / reformat( %x , %d ) = %d\n", |
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388 | index , i , buf[i] , temp , cat , value ); |
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389 | #endif |
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390 | |
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391 | } |
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392 | |
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393 | // write one block to mwmr_out channel ( 2 bytes per pixel) |
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394 | mwmr_write( mwmr_out, (uint32_t*)buf , 32 ); |
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395 | |
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396 | #if (DEBUG_VLD > 1 ) |
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397 | if ( (index == DEBUG_CLUSTER_INDEX) || (DEBUG_CLUSTER_INDEX == 0XFFFFFFFF) ) |
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398 | PRINTF("\nVLD[%d] completes block %d/%d in image %d\n" |
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399 | " %d %d %d %d %d %d %d %d\n" |
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400 | " %d %d %d %d %d %d %d %d\n" |
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401 | " %d %d %d %d %d %d %d %d\n" |
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402 | " %d %d %d %d %d %d %d %d\n" |
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403 | " %d %d %d %d %d %d %d %d\n" |
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404 | " %d %d %d %d %d %d %d %d\n" |
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405 | " %d %d %d %d %d %d %d %d\n" |
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406 | " %d %d %d %d %d %d %d %d\n", |
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407 | index , block , nblocks_w*nblocks_h , image , |
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408 | buf[0] , buf[1] , buf[2] , buf[3] , buf[4] , buf[5] , buf[6] , buf[7] , |
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409 | buf[8] , buf[9] , buf[10], buf[11], buf[12], buf[13], buf[14], buf[15], |
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410 | buf[16], buf[17], buf[18], buf[19], buf[20], buf[21], buf[22], buf[23], |
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411 | buf[24], buf[25], buf[26], buf[27], buf[28], buf[29], buf[30], buf[31], |
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412 | buf[32], buf[33], buf[34], buf[35], buf[36], buf[37], buf[38], buf[39], |
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413 | buf[40], buf[41], buf[42], buf[43], buf[44], buf[45], buf[46], buf[47], |
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414 | buf[48], buf[49], buf[50], buf[51], buf[52], buf[53], buf[54], buf[55], |
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415 | buf[56], buf[57], buf[58], buf[59], buf[60], buf[61], buf[62], buf[63]); |
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416 | #endif |
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417 | |
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418 | return buf[0]; |
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419 | |
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420 | } // end vld_unpack_block() |
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421 | |
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422 | |
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423 | ////////////////////////////////////////////////////////////// |
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424 | __attribute__ ((constructor)) void vld( uint32_t index ) |
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425 | ////////////////////////////////////////////////////////////// |
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426 | { |
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427 | mwmr_channel_t* mwmr_in_data = demux_2_vld_data[index]; |
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428 | mwmr_channel_t* mwmr_in_huff = demux_2_vld_huff[index]; |
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429 | mwmr_channel_t* mwmr_out = vld_2_iqzz[index]; |
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430 | |
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431 | huff_tables_t huff; // huffman tables |
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432 | bitreader_t stream; // bit stream buffer |
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433 | int16_t prev_dc; // previous block DC value |
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434 | uint32_t block; // block index |
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435 | |
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436 | // get platform parameters |
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437 | uint32_t x_size; |
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438 | uint32_t y_size; |
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439 | uint32_t nprocs; |
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440 | giet_procs_number( &x_size , &y_size , &nprocs ); |
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441 | |
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442 | // get processor coordinates |
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443 | uint32_t x, y, p; |
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444 | giet_proc_xyp( &x , &y , &p ); |
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445 | |
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446 | // private TTY allocation |
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447 | // giet_tty_alloc( 0 ); |
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448 | |
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449 | PRINTF("\n[MJPEG] thread VLD[%d] starts on P[%d,%d,%d] / trdid = %x\n", |
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450 | index , x , y , p, (uint32_t)trdid_vld[index] ); |
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451 | |
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452 | |
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453 | // initialise BUFIO for MWMR channel <in_data> |
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454 | uint8_t in_data_buffer[64]; |
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455 | mwmr_bufio_t bufio_in_data; |
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456 | mwmr_bufio_init( &bufio_in_data , in_data_buffer , 64 , 1 , mwmr_in_data ); |
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457 | |
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458 | #if (DEBUG_VLD > 1) |
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459 | if ( (index == DEBUG_CLUSTER_INDEX) || (DEBUG_CLUSTER_INDEX == 0XFFFFFFFF) ) |
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460 | PRINTF("\nVLD[%d] <in_data> : &mwmr = %x / &bufio = %x\n", |
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461 | index , mwmr_in_data , &bufio_in_data ); |
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462 | #endif |
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463 | |
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464 | // initialise BUFIO for MWMR channel <in_huff> |
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465 | uint8_t in_huff_buffer[64]; |
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466 | mwmr_bufio_t bufio_in_huff; |
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467 | mwmr_bufio_init( &bufio_in_huff , in_huff_buffer , 64 , 1 , mwmr_in_huff ); |
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468 | |
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469 | #if (DEBUG_VLD > 1) |
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470 | if ( (index == DEBUG_CLUSTER_INDEX) || (DEBUG_CLUSTER_INDEX == 0XFFFFFFFF) ) |
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471 | PRINTF("\nVLD[%d] <in_huff> : &mwmr = %x / &bufio = %x\n", |
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472 | index , mwmr_in_huff , &bufio_in_huff ) } |
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473 | #endif |
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474 | |
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475 | // initialise Huffman Tables |
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476 | huff_tables_init( &huff ); |
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477 | |
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478 | uint32_t image = index; |
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479 | uint32_t nblocks = nblocks_h * nblocks_w; |
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480 | |
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481 | while ( image < MAX_IMAGES ) // one image per iteration |
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482 | { |
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483 | // load first Huffman Table from bufio_in_huff |
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484 | huff_tables_load( index, &huff , &bufio_in_huff ); |
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485 | |
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486 | // load second Huffman Table from bufio_in_huff |
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487 | huff_tables_load( index, &huff , &bufio_in_huff ); |
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488 | |
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489 | #if (DEBUG_VLD > 1) |
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490 | if ( (index == DEBUG_CLUSTER_INDEX) || (DEBUG_CLUSTER_INDEX == 0XFFFFFFFF) ) |
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491 | PRINTF("\nVLD[%d] load Huffman tables for image %d\n", index , image ); |
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492 | #endif |
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493 | |
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494 | // (re)initializes DC value for each image |
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495 | prev_dc = 0; |
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496 | |
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497 | // (re)align data bufio for each image |
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498 | mwmr_bufio_align( &bufio_in_data ); |
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499 | |
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500 | // (re)initializes bit-stream for each image |
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501 | bitreader_init( &stream, &bufio_in_data ); |
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502 | |
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503 | // loop on the blocks in current image |
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504 | for ( block = 0 ; block < nblocks ; block++ ) |
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505 | { |
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506 | |
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507 | #if (DEBUG_VLD > 1) |
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508 | if ( (index == DEBUG_CLUSTER_INDEX) || (DEBUG_CLUSTER_INDEX == 0XFFFFFFFF) ) |
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509 | PRINTF("\nVLD[%d] uncompress block %d/%d in image %d\n", index, block, nblocks, image ); |
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510 | #endif |
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511 | prev_dc = vld_unpack_block( index, |
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512 | image, |
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513 | block, |
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514 | &stream, |
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515 | mwmr_out, |
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516 | &huff, |
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517 | prev_dc ); |
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518 | } // end for blocks |
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519 | |
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520 | #if DEBUG_VLD |
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521 | if ( (index == DEBUG_CLUSTER_INDEX) || (DEBUG_CLUSTER_INDEX == 0XFFFFFFFF) ) |
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522 | PRINTF("\nVLD[%d] completes image %d at cycle %d\n", index , image , giet_proctime() ); |
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523 | #endif |
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524 | image = image + x_size*y_size; |
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525 | |
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526 | } // end while on images |
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527 | |
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528 | giet_pthread_exit( "VLD completed" ); |
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529 | |
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530 | } // end vld() |
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531 | |
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