Mercurial > libedl
annotate src/main.c @ 2:d00bc412900e
*: fix up lots of stuff and make the thing actually usable
author | Paper <mrpapersonic@gmail.com> |
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date | Sun, 24 Dec 2023 20:01:30 -0500 |
parents | 0ea1ec2da443 |
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rev | line source |
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0 | 1 #include <string.h> |
2 #include <stdbool.h> | |
3 #include <stdio.h> | |
4 #include <stdlib.h> | |
5 #include <stdint.h> | |
6 #include "edl.h" | |
7 | |
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8 #define strnchr(haystack, needle, length) memchr(haystack, needle, strnlen(haystack, length)) |
0 | 9 |
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10 static uint32_t EDL_internal_crcn32b(const unsigned char* restrict message, size_t length) { |
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11 uint32_t crc = 0xFFFFFFFF; |
0 | 12 |
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13 size_t i; |
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14 for (i = 0; i < length && message[i]; i++) { |
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15 crc = crc ^ message[i]; |
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16 size_t j; |
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17 for (j = 0; j < 8; j++) |
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18 crc = (crc >> 1) ^ (0xEDB88320 & -(crc & 1)); |
0 | 19 } |
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20 |
0 | 21 return ~crc; |
22 } | |
23 | |
24 /* This parses the first line of the EDL and | |
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25 * creates an array with CRC32 hashes in |
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26 * the order of the strings. |
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27 */ |
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28 static uint32_t* EDL_internal_parse_first_line(const char* data, size_t* restrict length) { |
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29 size_t hashes_size = 32, current_hash = 0; |
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30 uint32_t* hashes = malloc(hashes_size * sizeof(uint32_t)); |
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31 |
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32 size_t len_until_newline = strchr(data, '\n') - data, i, b; |
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33 for (i = 0, b = 0; i < len_until_newline; i++, b++) { |
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34 if (data[i] == ';') { |
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35 if (current_hash >= hashes_size) |
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36 hashes = realloc(hashes, (hashes_size *= 2) * sizeof(uint32_t)); |
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37 hashes[current_hash++] = EDL_internal_crcn32b((const unsigned char*)&data[i - b], b); |
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38 b = -1; // ew |
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39 } |
0 | 40 } |
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41 |
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42 *length = current_hash; |
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43 |
0 | 44 return hashes; |
45 } | |
46 | |
47 /* -- Functions to extract different datatypes -- */ | |
48 | |
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49 static size_t EDL_internal_append_offset(const char* input, size_t offset, size_t length) { |
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50 size_t s = 0; |
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51 |
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52 s += strchr(&input[offset + s], ';') - &input[offset]; |
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53 if (s + offset > length) |
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54 return s; |
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55 |
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56 s += strspn(&input[offset + s], ";\t "); |
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57 if (s + offset > length) |
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58 return s; |
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59 |
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60 return s; |
0 | 61 } |
62 | |
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63 static size_t EDL_internal_get_int(const char* input, size_t offset, size_t length, int* int_return) { |
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64 if (offset > length) |
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65 return 0; |
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66 |
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67 { |
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68 char* ptr_return; |
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69 *int_return = strtol(&input[offset], &ptr_return, 10); |
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70 |
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71 if (!ptr_return) |
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72 return 0; |
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73 } |
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74 |
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75 return EDL_internal_append_offset(input, offset, length); |
0 | 76 } |
77 | |
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78 static size_t EDL_internal_get_double(const char* input, size_t offset, size_t length, double* double_return) { |
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79 if (offset > length) |
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80 return 0; |
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81 |
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82 { |
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83 char* ptr_return; |
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84 *double_return = strtod(&input[offset], &ptr_return); |
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85 |
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86 if (!ptr_return) |
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87 return 0; |
0 | 88 } |
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89 |
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90 return EDL_internal_append_offset(input, offset, length); |
0 | 91 } |
92 | |
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93 static size_t EDL_internal_get_bool(const char* input, size_t offset, size_t length, bool* bool_return) { |
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94 if (offset > length) |
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95 return 0; |
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96 |
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97 if (strncmp((input + offset), "TRUE", 4)) |
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98 *bool_return = true; |
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99 else if (strncmp((input + offset), "FALSE", 5)) |
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100 *bool_return = false; |
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101 |
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102 return EDL_internal_append_offset(input, offset, length); |
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103 } |
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104 |
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105 static size_t EDL_internal_get_media_type(const char* input, size_t offset, size_t length, MediaType* media_return) { |
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106 if (offset > length) |
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107 return 0; |
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108 |
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109 if (strncmp(input + offset, "VIDEO", 5)) |
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110 *media_return = MEDIATYPE_VIDEO; |
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111 else if (strncmp(input + offset, "AUDIO", 5)) |
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112 *media_return = MEDIATYPE_AUDIO; |
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113 |
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114 return EDL_internal_append_offset(input, offset, length); |
0 | 115 } |
116 | |
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117 static size_t EDL_internal_get_string(const char* input, size_t offset, size_t length, char** string_return) { |
0 | 118 /* Windows filenames will *NEVER* include double quotes. |
119 This might break with EDL files created with Reaper on Linux. */ | |
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120 if (offset > length) |
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121 return 0; |
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122 |
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123 size_t start = strchr(&input[offset], '\"') - &input[offset] + 1; |
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124 if (start + offset > length) |
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125 return 0; |
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126 |
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127 size_t s_length = strchr(&input[offset + start], '\"') - &input[offset] - start; |
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128 if (start + s_length + offset > length) |
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129 return 0; |
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130 |
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131 *string_return = malloc((s_length + 1) * sizeof(char)); |
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132 if (!*string_return) |
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133 return 0; |
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134 |
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135 memcpy(*string_return, &input[offset + start], s_length); |
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136 (*string_return)[s_length] = '\0'; |
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137 |
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138 return EDL_internal_append_offset(input, offset, length); |
0 | 139 } |
140 | |
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141 /* memory management routines */ |
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142 |
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143 static int EDL_internal_reallocate(EDL_file* input, size_t new_capacity) { |
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144 input->arr = realloc(input->arr, new_capacity * sizeof(EDL_line)); |
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145 if (!input->arr) |
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146 return 0; |
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147 |
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148 if (new_capacity > input->capacity) |
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149 memset(input->arr + input->capacity, 0, new_capacity - input->capacity); |
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150 |
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151 input->capacity = new_capacity; |
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152 |
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153 return 1; |
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154 } |
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155 |
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156 static int EDL_internal_allocate_memory(EDL_file* input) { |
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157 return EDL_internal_reallocate(input, input->capacity ? input->capacity * 2 : 16); |
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158 } |
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159 |
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160 static int EDL_internal_shrink_memory_to_fit(EDL_file* input) { |
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161 return EDL_internal_reallocate(input, input->size); |
0 | 162 } |
163 | |
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164 /* the important function */ |
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165 EDL_file EDL_parse(const char* data, size_t length) { |
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166 EDL_file edl = {0}; |
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167 if (!EDL_internal_allocate_memory(&edl)) |
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168 return edl; |
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169 |
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170 size_t order_size = 0; |
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171 uint32_t* order = EDL_internal_parse_first_line(data, &order_size); |
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172 |
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173 size_t offset = 0; |
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174 while ((offset = strnchr(data + offset + 1, '\n', length - offset) - (void*)data) < length) { |
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175 size_t local_offset = offset; // this is so our original offset stays intact |
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176 |
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177 bool ok = true; |
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178 |
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179 for (int i = 0; i < order_size; i++) { |
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180 #define ADD_TO_OFFSET(x, a) \ |
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181 { \ |
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182 size_t o = a(data, local_offset, length, &edl.arr[edl.size].x); \ |
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183 if (!o) \ |
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184 ok = false; \ |
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185 local_offset += o; \ |
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186 } |
0 | 187 switch (order[i]) { |
188 case 0x1541c503: /* ID */ | |
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189 ADD_TO_OFFSET(id, EDL_internal_get_int); |
0 | 190 break; |
191 case 0x4b211812: /* Track */ | |
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192 ADD_TO_OFFSET(track, EDL_internal_get_int); |
0 | 193 break; |
194 case 0xbb46516f: /* StartTime */ | |
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195 ADD_TO_OFFSET(start_time, EDL_internal_get_double); |
0 | 196 break; |
197 case 0xaeac5df7: /* Length */ | |
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198 ADD_TO_OFFSET(length, EDL_internal_get_double); |
0 | 199 break; |
200 case 0x03834606: /* PlayRate */ | |
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201 ADD_TO_OFFSET(play_rate, EDL_internal_get_double); |
0 | 202 break; |
203 case 0x0c2083d3: /* Locked */ | |
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204 ADD_TO_OFFSET(locked, EDL_internal_get_bool); |
0 | 205 break; |
206 case 0xe60c8b1d: /* Normalized */ | |
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207 ADD_TO_OFFSET(normalized, EDL_internal_get_bool); |
0 | 208 break; |
209 case 0xbe5802c9: /* StretchMethod */ | |
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210 ADD_TO_OFFSET(stretch_method, EDL_internal_get_int); |
0 | 211 break; |
212 case 0x4ec8be4c: /* Looped */ | |
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213 ADD_TO_OFFSET(looped, EDL_internal_get_bool); |
0 | 214 break; |
215 case 0xe6cb84d1: /* OnRuler */ | |
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216 ADD_TO_OFFSET(on_ruler, EDL_internal_get_bool); |
0 | 217 break; |
218 case 0x035f84c2: /* MediaType */ | |
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219 ADD_TO_OFFSET(media_type, EDL_internal_get_media_type); |
0 | 220 break; |
221 case 0x379d32c5: /* FileName */ | |
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222 ADD_TO_OFFSET(filename, EDL_internal_get_string); |
0 | 223 break; |
224 case 0x9f334738: /* Stream */ | |
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225 ADD_TO_OFFSET(stream, EDL_internal_get_int); |
0 | 226 break; |
227 case 0x07b4e0e7: /* StreamStart */ | |
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228 ADD_TO_OFFSET(stream_start, EDL_internal_get_double); |
0 | 229 break; |
230 case 0x8f16c7b8: /* StreamLength */ | |
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231 ADD_TO_OFFSET(stream_length, EDL_internal_get_double); |
0 | 232 break; |
233 case 0xd2edd7e4: /* FadeTimeIn */ | |
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234 ADD_TO_OFFSET(fade_time_in, EDL_internal_get_double); |
0 | 235 break; |
236 case 0x792e8c40: /* FadeTimeOut */ | |
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237 ADD_TO_OFFSET(fade_time_out, EDL_internal_get_double); |
0 | 238 break; |
239 case 0x98374657: /* SustainGain */ | |
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240 ADD_TO_OFFSET(sustain_gain, EDL_internal_get_double); |
0 | 241 break; |
242 case 0x3e998b1f: /* CurveIn */ | |
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243 ADD_TO_OFFSET(curve_in, EDL_internal_get_int); |
0 | 244 break; |
245 case 0x82fb09c4: /* GainIn */ | |
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246 ADD_TO_OFFSET(gain_in, EDL_internal_get_double); |
0 | 247 break; |
248 case 0x53add388: /* CurveOut */ | |
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249 ADD_TO_OFFSET(curve_out, EDL_internal_get_int); |
0 | 250 break; |
251 case 0x4210ba56: /* GainOut */ | |
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252 ADD_TO_OFFSET(gain_out, EDL_internal_get_double); |
0 | 253 break; |
254 case 0x89c4df6c: /* Layer */ | |
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255 ADD_TO_OFFSET(layer, EDL_internal_get_int); |
0 | 256 break; |
257 case 0xadf2f1a3: /* Color */ | |
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258 ADD_TO_OFFSET(color, EDL_internal_get_int); |
0 | 259 break; |
260 case 0xa56b43e1: /* CurveInR */ | |
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261 ADD_TO_OFFSET(curve_in_r, EDL_internal_get_int); |
0 | 262 break; |
263 case 0xcb6d715e: /* CurveOutR */ | |
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264 ADD_TO_OFFSET(curve_out_r, EDL_internal_get_int); |
0 | 265 break; |
266 case 0x9da1b9ed: /* PlayPitch */ | |
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267 ADD_TO_OFFSET(play_pitch, EDL_internal_get_double); |
0 | 268 break; |
269 case 0x2bda6ed4: /* LockPitch */ | |
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270 ADD_TO_OFFSET(lock_pitch, EDL_internal_get_bool); |
0 | 271 break; |
272 case 0x3071a4c6: /* FirstChannel */ | |
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273 ADD_TO_OFFSET(first_channel, EDL_internal_get_int); |
0 | 274 break; |
275 case 0x7de1bd40: /* Channels */ | |
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276 ADD_TO_OFFSET(channels, EDL_internal_get_int); |
0 | 277 break; |
278 default: | |
279 /* ... what */ | |
280 break; | |
281 } | |
282 } | |
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283 |
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284 if (!ok) |
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285 break; |
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286 |
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287 if (++edl.size >= edl.capacity) |
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288 EDL_internal_allocate_memory(&edl); |
0 | 289 } |
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290 |
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291 EDL_internal_shrink_memory_to_fit(&edl); |
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292 |
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293 free(order); |
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294 |
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295 return edl; |
0 | 296 } |
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297 |
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298 void EDL_free(EDL_file file) { |
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299 size_t i; |
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300 for (i = 0; i < file.size; i++) { |
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301 if (file.arr[i].filename) |
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302 free(file.arr[i].filename); |
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303 } |
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304 free(file.arr); |
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305 } |