1 | #include <stdio.h> |
---|
2 | #include <stdlib.h> |
---|
3 | #include <string.h> |
---|
4 | |
---|
5 | typedef unsigned char byte; |
---|
6 | /* byte must be 8 bits */ |
---|
7 | |
---|
8 | /* int must be at least 16 bits */ |
---|
9 | |
---|
10 | /* long must be at least 32 bits */ |
---|
11 | |
---|
12 | |
---|
13 | |
---|
14 | #define DIE_MSG( x ) \ |
---|
15 | { MSG( x ); exit( 1 ); } |
---|
16 | |
---|
17 | |
---|
18 | #define UPPER_NIBBLE( x ) \ |
---|
19 | (((128|64|32|16) & (x)) >> 4) |
---|
20 | |
---|
21 | #define LOWER_NIBBLE( x ) \ |
---|
22 | ((1|2|4|8) & (x)) |
---|
23 | |
---|
24 | #define COMBINE_HI_8LO( hi, lo ) \ |
---|
25 | ( (((unsigned)hi) << 8) | (unsigned)lo ) |
---|
26 | |
---|
27 | #define COMBINE_HI_4LO( hi, lo ) \ |
---|
28 | ( (((unsigned)hi) << 4) | (unsigned)lo ) |
---|
29 | |
---|
30 | const byte edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff, |
---|
31 | 0xff, 0xff, 0xff, 0x00 }; |
---|
32 | |
---|
33 | const byte edid_v1_descriptor_flag[] = { 0x00, 0x00 }; |
---|
34 | |
---|
35 | |
---|
36 | #define EDID_LENGTH 0x80 |
---|
37 | |
---|
38 | #define EDID_HEADER 0x00 |
---|
39 | #define EDID_HEADER_END 0x07 |
---|
40 | |
---|
41 | #define ID_MANUFACTURER_NAME 0x08 |
---|
42 | #define ID_MANUFACTURER_NAME_END 0x09 |
---|
43 | |
---|
44 | #define EDID_STRUCT_VERSION 0x12 |
---|
45 | #define EDID_STRUCT_REVISION 0x13 |
---|
46 | |
---|
47 | #define ESTABLISHED_TIMING_1 0x23 |
---|
48 | #define ESTABLISHED_TIMING_2 0x24 |
---|
49 | #define MANUFACTURERS_TIMINGS 0x25 |
---|
50 | |
---|
51 | #define DETAILED_TIMING_DESCRIPTIONS_START 0x36 |
---|
52 | #define DETAILED_TIMING_DESCRIPTION_SIZE 18 |
---|
53 | #define NO_DETAILED_TIMING_DESCRIPTIONS 4 |
---|
54 | |
---|
55 | |
---|
56 | |
---|
57 | #define DETAILED_TIMING_DESCRIPTION_1 0x36 |
---|
58 | #define DETAILED_TIMING_DESCRIPTION_2 0x48 |
---|
59 | #define DETAILED_TIMING_DESCRIPTION_3 0x5a |
---|
60 | #define DETAILED_TIMING_DESCRIPTION_4 0x6c |
---|
61 | |
---|
62 | |
---|
63 | |
---|
64 | #define PIXEL_CLOCK_LO (unsigned)dtd[ 0 ] |
---|
65 | #define PIXEL_CLOCK_HI (unsigned)dtd[ 1 ] |
---|
66 | #define PIXEL_CLOCK (COMBINE_HI_8LO( PIXEL_CLOCK_HI,PIXEL_CLOCK_LO )*10000) |
---|
67 | |
---|
68 | #define H_ACTIVE_LO (unsigned)dtd[ 2 ] |
---|
69 | |
---|
70 | #define H_BLANKING_LO (unsigned)dtd[ 3 ] |
---|
71 | |
---|
72 | #define H_ACTIVE_HI UPPER_NIBBLE( (unsigned)dtd[ 4 ] ) |
---|
73 | |
---|
74 | #define H_ACTIVE COMBINE_HI_8LO( H_ACTIVE_HI, H_ACTIVE_LO ) |
---|
75 | |
---|
76 | #define H_BLANKING_HI LOWER_NIBBLE( (unsigned)dtd[ 4 ] ) |
---|
77 | |
---|
78 | #define H_BLANKING COMBINE_HI_8LO( H_BLANKING_HI, H_BLANKING_LO ) |
---|
79 | |
---|
80 | |
---|
81 | |
---|
82 | |
---|
83 | #define V_ACTIVE_LO (unsigned)dtd[ 5 ] |
---|
84 | |
---|
85 | #define V_BLANKING_LO (unsigned)dtd[ 6 ] |
---|
86 | |
---|
87 | #define V_ACTIVE_HI UPPER_NIBBLE( (unsigned)dtd[ 7 ] ) |
---|
88 | |
---|
89 | #define V_ACTIVE COMBINE_HI_8LO( V_ACTIVE_HI, V_ACTIVE_LO ) |
---|
90 | |
---|
91 | #define V_BLANKING_HI LOWER_NIBBLE( (unsigned)dtd[ 7 ] ) |
---|
92 | |
---|
93 | #define V_BLANKING COMBINE_HI_8LO( V_BLANKING_HI, V_BLANKING_LO ) |
---|
94 | |
---|
95 | |
---|
96 | |
---|
97 | #define H_SYNC_OFFSET_LO (unsigned)dtd[ 8 ] |
---|
98 | #define H_SYNC_WIDTH_LO (unsigned)dtd[ 9 ] |
---|
99 | |
---|
100 | #define V_SYNC_OFFSET_LO UPPER_NIBBLE( (unsigned)dtd[ 10 ] ) |
---|
101 | #define V_SYNC_WIDTH_LO LOWER_NIBBLE( (unsigned)dtd[ 10 ] ) |
---|
102 | |
---|
103 | #define V_SYNC_WIDTH_HI ((unsigned)dtd[ 11 ] & (1|2)) |
---|
104 | #define V_SYNC_OFFSET_HI (((unsigned)dtd[ 11 ] & (4|8)) >> 2) |
---|
105 | |
---|
106 | #define H_SYNC_WIDTH_HI (((unsigned)dtd[ 11 ] & (16|32)) >> 4) |
---|
107 | #define H_SYNC_OFFSET_HI (((unsigned)dtd[ 11 ] & (64|128)) >> 6) |
---|
108 | |
---|
109 | |
---|
110 | #define V_SYNC_WIDTH COMBINE_HI_4LO( V_SYNC_WIDTH_HI, V_SYNC_WIDTH_LO ) |
---|
111 | #define V_SYNC_OFFSET COMBINE_HI_4LO( V_SYNC_OFFSET_HI, V_SYNC_OFFSET_LO ) |
---|
112 | |
---|
113 | #define H_SYNC_WIDTH COMBINE_HI_4LO( H_SYNC_WIDTH_HI, H_SYNC_WIDTH_LO ) |
---|
114 | #define H_SYNC_OFFSET COMBINE_HI_4LO( H_SYNC_OFFSET_HI, H_SYNC_OFFSET_LO ) |
---|
115 | |
---|
116 | #define H_SIZE_LO (unsigned)dtd[ 12 ] |
---|
117 | #define V_SIZE_LO (unsigned)dtd[ 13 ] |
---|
118 | |
---|
119 | #define H_SIZE_HI UPPER_NIBBLE( (unsigned)dtd[ 14 ] ) |
---|
120 | #define V_SIZE_HI LOWER_NIBBLE( (unsigned)dtd[ 14 ] ) |
---|
121 | |
---|
122 | #define H_SIZE COMBINE_HI_8LO( H_SIZE_HI, H_SIZE_LO ) |
---|
123 | #define V_SIZE COMBINE_HI_8LO( V_SIZE_HI, V_SIZE_LO ) |
---|
124 | |
---|
125 | #define H_BORDER (unsigned)dtd[ 15 ] |
---|
126 | #define V_BORDER (unsigned)dtd[ 16 ] |
---|
127 | |
---|
128 | #define FLAGS (unsigned)dtd[ 17 ] |
---|
129 | |
---|
130 | #define INTERLACED (FLAGS&128) |
---|
131 | |
---|
132 | |
---|
133 | #define MONITOR_NAME 0xfc |
---|
134 | #define MONITOR_LIMITS 0xfd |
---|
135 | #define UNKNOWN_DESCRIPTOR -1 |
---|
136 | #define DETAILED_TIMING_BLOCK -2 |
---|
137 | |
---|
138 | |
---|
139 | #define DESCRIPTOR_DATA 5 |
---|
140 | #define V_MIN_RATE block[ 5 ] |
---|
141 | #define V_MAX_RATE block[ 6 ] |
---|
142 | #define H_MIN_RATE block[ 7 ] |
---|
143 | #define H_MAX_RATE block[ 8 ] |
---|
144 | |
---|
145 | #define MAX_PIXEL_CLOCK (((int)block[ 9 ]) * 10) |
---|
146 | #define GTF_SUPPORT block[10] |
---|
147 | |
---|
148 | char* myname; |
---|
149 | |
---|
150 | void MSG( const char* x ) |
---|
151 | { |
---|
152 | fprintf( stderr, "%s: %s\n", myname, x ); |
---|
153 | } |
---|
154 | |
---|
155 | |
---|
156 | int |
---|
157 | parse_edid( byte* edid ); |
---|
158 | |
---|
159 | |
---|
160 | int |
---|
161 | parse_timing_description( byte* dtd ); |
---|
162 | |
---|
163 | |
---|
164 | int |
---|
165 | parse_monitor_limits( byte* block ); |
---|
166 | |
---|
167 | int |
---|
168 | block_type( byte* block ); |
---|
169 | |
---|
170 | char* |
---|
171 | get_monitor_name( byte const* block ); |
---|
172 | |
---|
173 | |
---|
174 | int |
---|
175 | main( int argc, char** argv ) |
---|
176 | { |
---|
177 | byte edid[ EDID_LENGTH ]; |
---|
178 | FILE* edid_file; |
---|
179 | |
---|
180 | myname = argv[ 0 ]; |
---|
181 | fprintf( stderr, "%s: parse-edid version 1.3.7\n", myname ); |
---|
182 | |
---|
183 | if ( argc > 2 ) |
---|
184 | { |
---|
185 | DIE_MSG( "syntax: [input EDID file]" ); |
---|
186 | } |
---|
187 | else |
---|
188 | { |
---|
189 | if ( argc == 2 ) |
---|
190 | { |
---|
191 | edid_file = fopen( argv[ 1 ], "rb" ); |
---|
192 | if ( !edid_file ) |
---|
193 | DIE_MSG( "unable to open file for input\n" ); |
---|
194 | } |
---|
195 | |
---|
196 | else |
---|
197 | edid_file = stdin; |
---|
198 | } |
---|
199 | |
---|
200 | if ( fread( edid, sizeof( byte ), EDID_LENGTH, edid_file ) |
---|
201 | != EDID_LENGTH ) |
---|
202 | |
---|
203 | { |
---|
204 | DIE_MSG( "IO error reading EDID" ); |
---|
205 | } |
---|
206 | |
---|
207 | fclose( edid_file ); |
---|
208 | |
---|
209 | return parse_edid( edid ); |
---|
210 | } |
---|
211 | |
---|
212 | int |
---|
213 | parse_edid( byte* edid ) |
---|
214 | { |
---|
215 | unsigned i; |
---|
216 | byte* block; |
---|
217 | char* monitor_name = "Unknown"; |
---|
218 | byte checksum = 0; |
---|
219 | |
---|
220 | for( i = 0; i < EDID_LENGTH; i++ ) |
---|
221 | checksum += edid[ i ]; |
---|
222 | |
---|
223 | if ( checksum != 0 ) |
---|
224 | MSG( "EDID checksum failed - data is corrupt. Continuing anyway." ); |
---|
225 | else |
---|
226 | MSG( "EDID checksum passed." ); |
---|
227 | |
---|
228 | |
---|
229 | if ( strncmp( edid+EDID_HEADER, edid_v1_header, EDID_HEADER_END+1 ) ) |
---|
230 | { |
---|
231 | MSG( "first bytes don't match EDID version 1 header" ); |
---|
232 | MSG( "do not trust output (if any)." ); |
---|
233 | } |
---|
234 | |
---|
235 | printf( "\n# EDID version %d revision %d\n", (int)edid[EDID_STRUCT_VERSION],(int)edid[EDID_STRUCT_REVISION] ); |
---|
236 | |
---|
237 | |
---|
238 | printf( "Section \"Monitor\"\n" ); |
---|
239 | |
---|
240 | block = edid + DETAILED_TIMING_DESCRIPTIONS_START; |
---|
241 | |
---|
242 | for( i = 0; i < NO_DETAILED_TIMING_DESCRIPTIONS; i++, |
---|
243 | block += DETAILED_TIMING_DESCRIPTION_SIZE ) |
---|
244 | { |
---|
245 | |
---|
246 | if ( block_type( block ) == MONITOR_NAME ) |
---|
247 | { |
---|
248 | monitor_name = get_monitor_name( block ); |
---|
249 | break; |
---|
250 | } |
---|
251 | } |
---|
252 | |
---|
253 | printf( "\tIdentifier \"%s\"\n", monitor_name ); |
---|
254 | printf( "\tVendorName \"Unknown\"\n" ); |
---|
255 | printf( "\tModelName \"%s\"\n", monitor_name ); |
---|
256 | |
---|
257 | |
---|
258 | block = edid + DETAILED_TIMING_DESCRIPTIONS_START; |
---|
259 | |
---|
260 | for( i = 0; i < NO_DETAILED_TIMING_DESCRIPTIONS; i++, |
---|
261 | block += DETAILED_TIMING_DESCRIPTION_SIZE ) |
---|
262 | { |
---|
263 | |
---|
264 | if ( block_type( block ) == MONITOR_LIMITS ) |
---|
265 | parse_monitor_limits( block ); |
---|
266 | } |
---|
267 | |
---|
268 | |
---|
269 | block = edid + DETAILED_TIMING_DESCRIPTIONS_START; |
---|
270 | |
---|
271 | for( i = 0; i < NO_DETAILED_TIMING_DESCRIPTIONS; i++, |
---|
272 | block += DETAILED_TIMING_DESCRIPTION_SIZE ) |
---|
273 | { |
---|
274 | |
---|
275 | if ( block_type( block ) == DETAILED_TIMING_BLOCK ) |
---|
276 | parse_timing_description( block ); |
---|
277 | } |
---|
278 | |
---|
279 | |
---|
280 | printf( "EndSection\n" ); |
---|
281 | |
---|
282 | return 0; |
---|
283 | } |
---|
284 | |
---|
285 | |
---|
286 | int |
---|
287 | parse_timing_description( byte* dtd ) |
---|
288 | { |
---|
289 | printf( "\tMode \t\"%dx%d\"\n", H_ACTIVE, V_ACTIVE ); |
---|
290 | |
---|
291 | printf( "\t\tDotClock\t%f\n", (double)PIXEL_CLOCK/1000000.0 ); |
---|
292 | |
---|
293 | printf( "\t\tHTimings\t%u %u %u %u\n", H_ACTIVE, |
---|
294 | H_ACTIVE+H_SYNC_OFFSET, |
---|
295 | H_ACTIVE+H_SYNC_OFFSET+H_SYNC_WIDTH, |
---|
296 | H_ACTIVE+H_BLANKING ); |
---|
297 | |
---|
298 | printf( "\t\tVTimings\t%u %u %u %u\n", V_ACTIVE, |
---|
299 | V_ACTIVE+V_SYNC_OFFSET, |
---|
300 | V_ACTIVE+V_SYNC_OFFSET+V_SYNC_WIDTH, |
---|
301 | V_ACTIVE+V_BLANKING ); |
---|
302 | |
---|
303 | if ( INTERLACED ) |
---|
304 | printf( "\t\tFlags\t\"Interlace\"\n" ); |
---|
305 | |
---|
306 | printf( "\tEndMode\n" ); |
---|
307 | |
---|
308 | return 0; |
---|
309 | } |
---|
310 | |
---|
311 | |
---|
312 | int |
---|
313 | block_type( byte* block ) |
---|
314 | { |
---|
315 | |
---|
316 | if ( !strncmp( edid_v1_descriptor_flag, block, 2 ) ) |
---|
317 | { |
---|
318 | |
---|
319 | /* descriptor */ |
---|
320 | |
---|
321 | if ( block[ 2 ] != 0 ) |
---|
322 | return UNKNOWN_DESCRIPTOR; |
---|
323 | |
---|
324 | |
---|
325 | return block[ 3 ]; |
---|
326 | } else { |
---|
327 | |
---|
328 | /* detailed timing block */ |
---|
329 | |
---|
330 | return DETAILED_TIMING_BLOCK; |
---|
331 | } |
---|
332 | } |
---|
333 | |
---|
334 | char* |
---|
335 | get_monitor_name( byte const* block ) |
---|
336 | { |
---|
337 | static char name[ 13 ]; |
---|
338 | unsigned i; |
---|
339 | byte const* ptr = block + DESCRIPTOR_DATA; |
---|
340 | |
---|
341 | |
---|
342 | for( i = 0; i < 13; i++, ptr++ ) |
---|
343 | { |
---|
344 | |
---|
345 | if ( *ptr == 0xa ) |
---|
346 | { |
---|
347 | name[ i ] = 0; |
---|
348 | return name; |
---|
349 | } |
---|
350 | |
---|
351 | name[ i ] = *ptr; |
---|
352 | } |
---|
353 | |
---|
354 | |
---|
355 | return name; |
---|
356 | } |
---|
357 | |
---|
358 | int |
---|
359 | parse_monitor_limits( byte* block ) |
---|
360 | { |
---|
361 | printf( "\tHorizSync %u-%u\n", H_MIN_RATE, H_MAX_RATE ); |
---|
362 | printf( "\tVertRefresh %u-%u\n", V_MIN_RATE, V_MAX_RATE ); |
---|
363 | if ( MAX_PIXEL_CLOCK == 10*0xff ) |
---|
364 | printf( "# Max dot clock not given\n" ); |
---|
365 | else |
---|
366 | printf( "# Max dot clock (video bandwidth) %u MHz\n", (int)MAX_PIXEL_CLOCK ); |
---|
367 | |
---|
368 | if ( GTF_SUPPORT ) |
---|
369 | { |
---|
370 | printf( "# EDID version 3 GTF given: contact author\n" ); |
---|
371 | } |
---|
372 | |
---|
373 | return 0; |
---|
374 | } |
---|
375 | |
---|