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comparison src/main.c @ 0:0ea1ec2da443

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*: initial commit
author Paper <mrpapersonic@gmail.com>
date Tue, 04 Jul 2023 22:44:41 -0400
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children d00bc412900e
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-1:000000000000 0:0ea1ec2da443
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
8 int strings_amt = -1;
9
10 /* CRC32 hash function */
11 uint32_t crc32b(unsigned char* restrict message) {
12 int32_t i, j;
13 uint32_t byte, crc, mask;
14
15 crc = 0xFFFFFFFF;
16 for (i = 0; message[i] != 0; i++) {
17 byte = message[i]; // Get next byte.
18 crc = crc ^ byte;
19 for (j = 7; j >= 0; j--) { // Do eight times.
20 mask = -(crc & 1);
21 crc = (crc >> 1) ^ (0xEDB88320 & mask);
22 }
23 }
24 return ~crc;
25 }
26
27 /* This parses the first line of the EDL and
28 creates an array with CRC32 hashes in
29 the order of the strings. */
30 uint32_t* parse_first_line(char* first_line) {
31 uint32_t* hashes = calloc(32, sizeof(uint32_t));
32 int i = 0;
33 char* token;
34 hashes[i++] = crc32b(strtok_r(first_line, ";", &token));
35 for (;;i++) {
36 char* token = strtok_r(NULL, ";", &token);
37 if (token == NULL)
38 break;
39 hashes[i] = crc32b(token);
40 }
41 strings_amt = i;
42 free(first_line);
43 return hashes;
44 }
45
46 /* -- Functions to extract different datatypes -- */
47
48 char* get_int(char* input, int* int_return) {
49 char* ptr_return;
50 *int_return = strtol(input, &ptr_return, 10);
51 return ptr_return + 2;
52 }
53
54 char* get_double(char* input, double* double_return) {
55 char* ptr_return;
56 *double_return = strtod(input, &ptr_return);
57 return ptr_return + 2;
58 }
59
60 char* get_bool(char* input, bool* bool_return) {
61 switch (input[0]) {
62 case 'T':
63 *bool_return = true;
64 return input + 6;
65 case 'F':
66 *bool_return = false;
67 return input + 7;
68 default:
69 /* what */
70 return NULL;
71 }
72 }
73
74 char* get_media_type(char* input, MediaType* media_return) {
75 switch (input[0]) {
76 case 'V':
77 *media_return = video;
78 return input + 7;
79 case 'A':
80 *media_return = audio;
81 return input + 7;
82 default:
83 /* what */
84 return NULL;
85 }
86 }
87
88 /* lenptr is optional */
89 char* cut_string_at_match(char* input, char* match, int* lenptr) {
90 int length = strcspn(&input[1], match);
91 char* string = calloc(length+1, sizeof(char));
92 memcpy(string, &input[1], length);
93 string[length] = '\0';
94 if (lenptr != NULL)
95 *lenptr = length;
96 return string;
97 }
98
99 char* get_string(char* input, char** string_return) {
100 /* Windows filenames will *NEVER* include double quotes.
101 This might break with EDL files created with Reaper on Linux. */
102 int length;
103 char* string = cut_string_at_match(input, "\"", &length);
104 *string_return = string;
105 return input + length + 4;
106 }
107
108 /* The memory manager for EDL_file. */
109 void allocate_memory(EDL_file* input) {
110 if (input->size == 0) input->size = 16;
111 input->edl = realloc(input->edl, (input->size*2) * sizeof(EDL_line));
112 input->size *= 2;
113 }
114
115 /* This is the important function */
116 EDL_file* parse_EDL(char* text) {
117 EDL_file edl;
118 memset(&edl, '\0', sizeof(edl));
119 allocate_memory(&edl);
120 uint32_t* order = parse_first_line(strtok_r(text, "\n", NULL));
121 char* line = strtok(text, "\n");
122 while ((line = strtok(NULL, "\n")) != NULL) {
123 char* tmp_ptr = line;
124 for (int i = 0; i < strings_amt; i++) {
125 switch (order[i]) {
126 case 0x1541c503: /* ID */
127 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].id);
128 break;
129 case 0x4b211812: /* Track */
130 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].track);
131 break;
132 case 0xbb46516f: /* StartTime */
133 tmp_ptr = get_double(tmp_ptr, &edl.edl[edl.current].start_time);
134 break;
135 case 0xaeac5df7: /* Length */
136 tmp_ptr = get_double(tmp_ptr, &edl.edl[edl.current].length);
137 break;
138 case 0x03834606: /* PlayRate */
139 tmp_ptr = get_double(tmp_ptr, &edl.edl[edl.current].play_rate);
140 break;
141 case 0x0c2083d3: /* Locked */
142 tmp_ptr = get_bool(tmp_ptr, &edl.edl[edl.current].locked);
143 break;
144 case 0xe60c8b1d: /* Normalized */
145 tmp_ptr = get_bool(tmp_ptr, &edl.edl[edl.current].normalized);
146 break;
147 case 0xbe5802c9: /* StretchMethod */
148 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].stretch_method);
149 break;
150 case 0x4ec8be4c: /* Looped */
151 tmp_ptr = get_bool(tmp_ptr, &edl.edl[edl.current].looped);
152 break;
153 case 0xe6cb84d1: /* OnRuler */
154 tmp_ptr = get_bool(tmp_ptr, &edl.edl[edl.current].on_ruler);
155 break;
156 case 0x035f84c2: /* MediaType */
157 tmp_ptr = get_media_type(tmp_ptr, &edl.edl[edl.current].media_type);
158 break;
159 case 0x379d32c5: /* FileName */
160 tmp_ptr = get_string(tmp_ptr, &edl.edl[edl.current].file_name);
161 break;
162 case 0x9f334738: /* Stream */
163 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].stream);
164 break;
165 case 0x07b4e0e7: /* StreamStart */
166 tmp_ptr = get_double(tmp_ptr, &edl.edl[edl.current].stream_start);
167 break;
168 case 0x8f16c7b8: /* StreamLength */
169 tmp_ptr = get_double(tmp_ptr, &edl.edl[edl.current].stream_length);
170 break;
171 case 0xd2edd7e4: /* FadeTimeIn */
172 tmp_ptr = get_double(tmp_ptr, &edl.edl[edl.current].fade_time_in);
173 break;
174 case 0x792e8c40: /* FadeTimeOut */
175 tmp_ptr = get_double(tmp_ptr, &edl.edl[edl.current].fade_time_out);
176 break;
177 case 0x98374657: /* SustainGain */
178 tmp_ptr = get_double(tmp_ptr, &edl.edl[edl.current].sustain_gain);
179 break;
180 case 0x3e998b1f: /* CurveIn */
181 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].curve_in);
182 break;
183 case 0x82fb09c4: /* GainIn */
184 tmp_ptr = get_double(tmp_ptr, &edl.edl[edl.current].gain_in);
185 break;
186 case 0x53add388: /* CurveOut */
187 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].curve_out);
188 break;
189 case 0x4210ba56: /* GainOut */
190 tmp_ptr = get_double(tmp_ptr, &edl.edl[edl.current].gain_out);
191 break;
192 case 0x89c4df6c: /* Layer */
193 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].layer);
194 break;
195 case 0xadf2f1a3: /* Color */
196 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].color);
197 break;
198 case 0xa56b43e1: /* CurveInR */
199 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].curve_in_r);
200 break;
201 case 0xcb6d715e: /* CurveOutR */
202 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].curve_out_r);
203 break;
204 case 0x9da1b9ed: /* PlayPitch */
205 tmp_ptr = get_double(tmp_ptr, &edl.edl[edl.current].play_pitch);
206 break;
207 case 0x2bda6ed4: /* LockPitch */
208 tmp_ptr = get_bool(tmp_ptr, &edl.edl[edl.current].lock_pitch);
209 break;
210 case 0x3071a4c6: /* FirstChannel */
211 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].first_channel);
212 break;
213 case 0x7de1bd40: /* Channels */
214 tmp_ptr = get_int(tmp_ptr, &edl.edl[edl.current].channels);
215 break;
216 default:
217 /* ... what */
218 break;
219 }
220 }
221 edl.current++;
222 if (edl.current >= edl.size)
223 allocate_memory(&edl);
224 }
225 }