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1 #include <string.h>
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2 #include <stdbool.h>
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3 #include <stdio.h>
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4 #include <stdlib.h>
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5 #include <stdint.h>
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6 #include "edl.h"
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7
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8 int strings_amt = -1;
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9
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10 /* CRC32 hash function */
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11 uint32_t crc32b(unsigned char* restrict message) {
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12 int32_t i, j;
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13 uint32_t byte, crc, mask;
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14
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15 crc = 0xFFFFFFFF;
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16 for (i = 0; message[i] != 0; i++) {
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17 byte = message[i]; // Get next byte.
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18 crc = crc ^ byte;
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19 for (j = 7; j >= 0; j--) { // Do eight times.
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20 mask = -(crc & 1);
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21 crc = (crc >> 1) ^ (0xEDB88320 & mask);
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22 }
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23 }
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24 return ~crc;
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25 }
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26
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27 /* This parses the first line of the EDL and
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28 creates an array with CRC32 hashes in
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29 the order of the strings. */
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30 uint32_t* parse_first_line(char* first_line) {
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31 uint32_t* hashes = calloc(32, sizeof(uint32_t));
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32 int i = 0;
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33 char* token;
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34 hashes[i++] = crc32b(strtok_r(first_line, ";", &token));
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35 for (;;i++) {
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36 char* token = strtok_r(NULL, ";", &token);
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37 if (token == NULL)
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38 break;
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39 hashes[i] = crc32b(token);
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40 }
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41 strings_amt = i;
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42 free(first_line);
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43 return hashes;
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44 }
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45
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46 /* -- Functions to extract different datatypes -- */
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47
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48 char* get_int(char* input, int* int_return) {
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49 char* ptr_return;
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50 *int_return = strtol(input, &ptr_return, 10);
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51 return ptr_return + 2;
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52 }
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53
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54 char* get_double(char* input, double* double_return) {
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55 char* ptr_return;
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56 *double_return = strtod(input, &ptr_return);
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57 return ptr_return + 2;
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58 }
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59
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60 char* get_bool(char* input, bool* bool_return) {
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61 switch (input[0]) {
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62 case 'T':
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63 *bool_return = true;
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64 return input + 6;
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65 case 'F':
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66 *bool_return = false;
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67 return input + 7;
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68 default:
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69 /* what */
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70 return NULL;
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71 }
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72 }
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73
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74 char* get_media_type(char* input, MediaType* media_return) {
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75 switch (input[0]) {
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76 case 'V':
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77 *media_return = video;
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78 return input + 7;
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79 case 'A':
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80 *media_return = audio;
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81 return input + 7;
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82 default:
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83 /* what */
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84 return NULL;
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85 }
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86 }
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87
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88 /* lenptr is optional */
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89 char* cut_string_at_match(char* input, char* match, int* lenptr) {
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90 int length = strcspn(&input[1], match);
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91 char* string = calloc(length+1, sizeof(char));
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92 memcpy(string, &input[1], length);
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93 string[length] = '\0';
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94 if (lenptr != NULL)
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95 *lenptr = length;
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96 return string;
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97 }
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98
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99 char* get_string(char* input, char** string_return) {
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100 /* Windows filenames will *NEVER* include double quotes.
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101 This might break with EDL files created with Reaper on Linux. */
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102 int length;
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103 char* string = cut_string_at_match(input, "\"", &length);
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104 *string_return = string;
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105 return input + length + 4;
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106 }
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107
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108 /* The memory manager for EDL_file. */
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109 void allocate_memory(EDL_file* input) {
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110 if (input->size == 0) input->size = 16;
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111 input->edl = realloc(input->edl, (input->size*2) * sizeof(EDL_line));
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112 input->size *= 2;
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113 }
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114
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115 /* This is the important function */
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116 EDL_file* parse_EDL(char* text) {
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117 EDL_file edl;
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118 memset(&edl, '\0', sizeof(edl));
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119 allocate_memory(&edl);
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120 uint32_t* order = parse_first_line(strtok_r(text, "\n", NULL));
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121 char* line = strtok(text, "\n");
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122 while ((line = strtok(NULL, "\n")) != NULL) {
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123 char* tmp_ptr = line;
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124 for (int i = 0; i < strings_amt; i++) {
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125 switch (order[i]) {
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126 case 0x1541c503: /* ID */
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127 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].id);
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128 break;
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129 case 0x4b211812: /* Track */
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130 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].track);
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131 break;
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132 case 0xbb46516f: /* StartTime */
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133 tmp_ptr = get_double(tmp_ptr, &edl.edl[edl.current].start_time);
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134 break;
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135 case 0xaeac5df7: /* Length */
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136 tmp_ptr = get_double(tmp_ptr, &edl.edl[edl.current].length);
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137 break;
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138 case 0x03834606: /* PlayRate */
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139 tmp_ptr = get_double(tmp_ptr, &edl.edl[edl.current].play_rate);
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140 break;
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141 case 0x0c2083d3: /* Locked */
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142 tmp_ptr = get_bool(tmp_ptr, &edl.edl[edl.current].locked);
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143 break;
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144 case 0xe60c8b1d: /* Normalized */
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145 tmp_ptr = get_bool(tmp_ptr, &edl.edl[edl.current].normalized);
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146 break;
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147 case 0xbe5802c9: /* StretchMethod */
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148 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].stretch_method);
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149 break;
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150 case 0x4ec8be4c: /* Looped */
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151 tmp_ptr = get_bool(tmp_ptr, &edl.edl[edl.current].looped);
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152 break;
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153 case 0xe6cb84d1: /* OnRuler */
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154 tmp_ptr = get_bool(tmp_ptr, &edl.edl[edl.current].on_ruler);
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155 break;
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156 case 0x035f84c2: /* MediaType */
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157 tmp_ptr = get_media_type(tmp_ptr, &edl.edl[edl.current].media_type);
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158 break;
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159 case 0x379d32c5: /* FileName */
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160 tmp_ptr = get_string(tmp_ptr, &edl.edl[edl.current].file_name);
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161 break;
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162 case 0x9f334738: /* Stream */
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163 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].stream);
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164 break;
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165 case 0x07b4e0e7: /* StreamStart */
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166 tmp_ptr = get_double(tmp_ptr, &edl.edl[edl.current].stream_start);
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167 break;
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168 case 0x8f16c7b8: /* StreamLength */
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169 tmp_ptr = get_double(tmp_ptr, &edl.edl[edl.current].stream_length);
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170 break;
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171 case 0xd2edd7e4: /* FadeTimeIn */
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172 tmp_ptr = get_double(tmp_ptr, &edl.edl[edl.current].fade_time_in);
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173 break;
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174 case 0x792e8c40: /* FadeTimeOut */
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175 tmp_ptr = get_double(tmp_ptr, &edl.edl[edl.current].fade_time_out);
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176 break;
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177 case 0x98374657: /* SustainGain */
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178 tmp_ptr = get_double(tmp_ptr, &edl.edl[edl.current].sustain_gain);
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179 break;
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180 case 0x3e998b1f: /* CurveIn */
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181 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].curve_in);
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182 break;
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183 case 0x82fb09c4: /* GainIn */
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184 tmp_ptr = get_double(tmp_ptr, &edl.edl[edl.current].gain_in);
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185 break;
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186 case 0x53add388: /* CurveOut */
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187 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].curve_out);
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188 break;
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189 case 0x4210ba56: /* GainOut */
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190 tmp_ptr = get_double(tmp_ptr, &edl.edl[edl.current].gain_out);
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191 break;
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192 case 0x89c4df6c: /* Layer */
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193 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].layer);
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194 break;
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195 case 0xadf2f1a3: /* Color */
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196 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].color);
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197 break;
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198 case 0xa56b43e1: /* CurveInR */
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199 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].curve_in_r);
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200 break;
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201 case 0xcb6d715e: /* CurveOutR */
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202 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].curve_out_r);
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203 break;
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204 case 0x9da1b9ed: /* PlayPitch */
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205 tmp_ptr = get_double(tmp_ptr, &edl.edl[edl.current].play_pitch);
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206 break;
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207 case 0x2bda6ed4: /* LockPitch */
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208 tmp_ptr = get_bool(tmp_ptr, &edl.edl[edl.current].lock_pitch);
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209 break;
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210 case 0x3071a4c6: /* FirstChannel */
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211 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].first_channel);
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212 break;
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213 case 0x7de1bd40: /* Channels */
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214 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].channels);
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215 break;
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216 default:
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217 /* ... what */
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218 break;
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219 }
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220 }
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221 edl.current++;
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222 if (edl.current >= edl.size)
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223 allocate_memory(&edl);
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224 }
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225 }
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