Shoaib Ahmed / Mbed 2 deprecated uzairkhan

Final 350 project

Dependencies:   uzair Camera_LS_Y201 F7_Ethernet LCD_DISCO_F746NG NetworkAPI SDFileSystem mbed

includes/rdswitch.c@0:791a779d6220, 2017-07-31 (annotated)

Committer:
shoaib_ahmed
Date:
Mon Jul 31 09:16:35 2017 +0000
Revision:
0:791a779d6220
final project;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
shoaib_ahmed 0:791a779d6220 1 /*
shoaib_ahmed 0:791a779d6220 2 * rdswitch.c
shoaib_ahmed 0:791a779d6220 3 *
shoaib_ahmed 0:791a779d6220 4 * Copyright (C) 1991-1996, Thomas G. Lane.
shoaib_ahmed 0:791a779d6220 5 * Modified 2003-2015 by Guido Vollbeding.
shoaib_ahmed 0:791a779d6220 6 * This file is part of the Independent JPEG Group's software.
shoaib_ahmed 0:791a779d6220 7 * For conditions of distribution and use, see the accompanying README file.
shoaib_ahmed 0:791a779d6220 8 *
shoaib_ahmed 0:791a779d6220 9 * This file contains routines to process some of cjpeg's more complicated
shoaib_ahmed 0:791a779d6220 10 * command-line switches. Switches processed here are:
shoaib_ahmed 0:791a779d6220 11 * -qtables file Read quantization tables from text file
shoaib_ahmed 0:791a779d6220 12 * -scans file Read scan script from text file
shoaib_ahmed 0:791a779d6220 13 * -quality N[,N,...] Set quality ratings
shoaib_ahmed 0:791a779d6220 14 * -qslots N[,N,...] Set component quantization table selectors
shoaib_ahmed 0:791a779d6220 15 * -sample HxV[,HxV,...] Set component sampling factors
shoaib_ahmed 0:791a779d6220 16 */
shoaib_ahmed 0:791a779d6220 17
shoaib_ahmed 0:791a779d6220 18 #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
shoaib_ahmed 0:791a779d6220 19 #include <ctype.h> /* to declare isdigit(), isspace() */
shoaib_ahmed 0:791a779d6220 20
shoaib_ahmed 0:791a779d6220 21
shoaib_ahmed 0:791a779d6220 22 LOCAL(int)
shoaib_ahmed 0:791a779d6220 23 text_getc (FILE * file)
shoaib_ahmed 0:791a779d6220 24 /* Read next char, skipping over any comments (# to end of line) */
shoaib_ahmed 0:791a779d6220 25 /* A comment/newline sequence is returned as a newline */
shoaib_ahmed 0:791a779d6220 26 {
shoaib_ahmed 0:791a779d6220 27 register int ch;
shoaib_ahmed 0:791a779d6220 28
shoaib_ahmed 0:791a779d6220 29 ch = getc(file);
shoaib_ahmed 0:791a779d6220 30 if (ch == '#') {
shoaib_ahmed 0:791a779d6220 31 do {
shoaib_ahmed 0:791a779d6220 32 ch = getc(file);
shoaib_ahmed 0:791a779d6220 33 } while (ch != '\n' && ch != EOF);
shoaib_ahmed 0:791a779d6220 34 }
shoaib_ahmed 0:791a779d6220 35 return ch;
shoaib_ahmed 0:791a779d6220 36 }
shoaib_ahmed 0:791a779d6220 37
shoaib_ahmed 0:791a779d6220 38
shoaib_ahmed 0:791a779d6220 39 LOCAL(boolean)
shoaib_ahmed 0:791a779d6220 40 read_text_integer (FILE * file, long * result, int * termchar)
shoaib_ahmed 0:791a779d6220 41 /* Read an unsigned decimal integer from a file, store it in result */
shoaib_ahmed 0:791a779d6220 42 /* Reads one trailing character after the integer; returns it in termchar */
shoaib_ahmed 0:791a779d6220 43 {
shoaib_ahmed 0:791a779d6220 44 register int ch;
shoaib_ahmed 0:791a779d6220 45 register long val;
shoaib_ahmed 0:791a779d6220 46
shoaib_ahmed 0:791a779d6220 47 /* Skip any leading whitespace, detect EOF */
shoaib_ahmed 0:791a779d6220 48 do {
shoaib_ahmed 0:791a779d6220 49 ch = text_getc(file);
shoaib_ahmed 0:791a779d6220 50 if (ch == EOF) {
shoaib_ahmed 0:791a779d6220 51 *termchar = ch;
shoaib_ahmed 0:791a779d6220 52 return FALSE;
shoaib_ahmed 0:791a779d6220 53 }
shoaib_ahmed 0:791a779d6220 54 } while (isspace(ch));
shoaib_ahmed 0:791a779d6220 55
shoaib_ahmed 0:791a779d6220 56 if (! isdigit(ch)) {
shoaib_ahmed 0:791a779d6220 57 *termchar = ch;
shoaib_ahmed 0:791a779d6220 58 return FALSE;
shoaib_ahmed 0:791a779d6220 59 }
shoaib_ahmed 0:791a779d6220 60
shoaib_ahmed 0:791a779d6220 61 val = ch - '0';
shoaib_ahmed 0:791a779d6220 62 while ((ch = text_getc(file)) != EOF) {
shoaib_ahmed 0:791a779d6220 63 if (! isdigit(ch))
shoaib_ahmed 0:791a779d6220 64 break;
shoaib_ahmed 0:791a779d6220 65 val *= 10;
shoaib_ahmed 0:791a779d6220 66 val += ch - '0';
shoaib_ahmed 0:791a779d6220 67 }
shoaib_ahmed 0:791a779d6220 68 *result = val;
shoaib_ahmed 0:791a779d6220 69 *termchar = ch;
shoaib_ahmed 0:791a779d6220 70 return TRUE;
shoaib_ahmed 0:791a779d6220 71 }
shoaib_ahmed 0:791a779d6220 72
shoaib_ahmed 0:791a779d6220 73
shoaib_ahmed 0:791a779d6220 74 GLOBAL(boolean)
shoaib_ahmed 0:791a779d6220 75 read_quant_tables (j_compress_ptr cinfo, char * filename, boolean force_baseline)
shoaib_ahmed 0:791a779d6220 76 /* Read a set of quantization tables from the specified file.
shoaib_ahmed 0:791a779d6220 77 * The file is plain ASCII text: decimal numbers with whitespace between.
shoaib_ahmed 0:791a779d6220 78 * Comments preceded by '#' may be included in the file.
shoaib_ahmed 0:791a779d6220 79 * There may be one to NUM_QUANT_TBLS tables in the file, each of 64 values.
shoaib_ahmed 0:791a779d6220 80 * The tables are implicitly numbered 0,1,etc.
shoaib_ahmed 0:791a779d6220 81 * NOTE: does not affect the qslots mapping, which will default to selecting
shoaib_ahmed 0:791a779d6220 82 * table 0 for luminance (or primary) components, 1 for chrominance components.
shoaib_ahmed 0:791a779d6220 83 * You must use -qslots if you want a different component->table mapping.
shoaib_ahmed 0:791a779d6220 84 */
shoaib_ahmed 0:791a779d6220 85 {
shoaib_ahmed 0:791a779d6220 86 FILE * fp;
shoaib_ahmed 0:791a779d6220 87 int tblno, i, termchar;
shoaib_ahmed 0:791a779d6220 88 long val;
shoaib_ahmed 0:791a779d6220 89 unsigned int table[DCTSIZE2];
shoaib_ahmed 0:791a779d6220 90
shoaib_ahmed 0:791a779d6220 91 if ((fp = fopen(filename, "r")) == NULL) {
shoaib_ahmed 0:791a779d6220 92 fprintf(stderr, "Can't open table file %s\n", filename);
shoaib_ahmed 0:791a779d6220 93 return FALSE;
shoaib_ahmed 0:791a779d6220 94 }
shoaib_ahmed 0:791a779d6220 95 tblno = 0;
shoaib_ahmed 0:791a779d6220 96
shoaib_ahmed 0:791a779d6220 97 while (read_text_integer(fp, &val, &termchar)) { /* read 1st element of table */
shoaib_ahmed 0:791a779d6220 98 if (tblno >= NUM_QUANT_TBLS) {
shoaib_ahmed 0:791a779d6220 99 fprintf(stderr, "Too many tables in file %s\n", filename);
shoaib_ahmed 0:791a779d6220 100 fclose(fp);
shoaib_ahmed 0:791a779d6220 101 return FALSE;
shoaib_ahmed 0:791a779d6220 102 }
shoaib_ahmed 0:791a779d6220 103 table[0] = (unsigned int) val;
shoaib_ahmed 0:791a779d6220 104 for (i = 1; i < DCTSIZE2; i++) {
shoaib_ahmed 0:791a779d6220 105 if (! read_text_integer(fp, &val, &termchar)) {
shoaib_ahmed 0:791a779d6220 106 fprintf(stderr, "Invalid table data in file %s\n", filename);
shoaib_ahmed 0:791a779d6220 107 fclose(fp);
shoaib_ahmed 0:791a779d6220 108 return FALSE;
shoaib_ahmed 0:791a779d6220 109 }
shoaib_ahmed 0:791a779d6220 110 table[i] = (unsigned int) val;
shoaib_ahmed 0:791a779d6220 111 }
shoaib_ahmed 0:791a779d6220 112 jpeg_add_quant_table(cinfo, tblno, table, cinfo->q_scale_factor[tblno],
shoaib_ahmed 0:791a779d6220 113 force_baseline);
shoaib_ahmed 0:791a779d6220 114 tblno++;
shoaib_ahmed 0:791a779d6220 115 }
shoaib_ahmed 0:791a779d6220 116
shoaib_ahmed 0:791a779d6220 117 if (termchar != EOF) {
shoaib_ahmed 0:791a779d6220 118 fprintf(stderr, "Non-numeric data in file %s\n", filename);
shoaib_ahmed 0:791a779d6220 119 fclose(fp);
shoaib_ahmed 0:791a779d6220 120 return FALSE;
shoaib_ahmed 0:791a779d6220 121 }
shoaib_ahmed 0:791a779d6220 122
shoaib_ahmed 0:791a779d6220 123 fclose(fp);
shoaib_ahmed 0:791a779d6220 124 return TRUE;
shoaib_ahmed 0:791a779d6220 125 }
shoaib_ahmed 0:791a779d6220 126
shoaib_ahmed 0:791a779d6220 127
shoaib_ahmed 0:791a779d6220 128 #ifdef C_MULTISCAN_FILES_SUPPORTED
shoaib_ahmed 0:791a779d6220 129
shoaib_ahmed 0:791a779d6220 130 LOCAL(boolean)
shoaib_ahmed 0:791a779d6220 131 read_scan_integer (FILE * file, long * result, int * termchar)
shoaib_ahmed 0:791a779d6220 132 /* Variant of read_text_integer that always looks for a non-space termchar;
shoaib_ahmed 0:791a779d6220 133 * this simplifies parsing of punctuation in scan scripts.
shoaib_ahmed 0:791a779d6220 134 */
shoaib_ahmed 0:791a779d6220 135 {
shoaib_ahmed 0:791a779d6220 136 register int ch;
shoaib_ahmed 0:791a779d6220 137
shoaib_ahmed 0:791a779d6220 138 if (! read_text_integer(file, result, termchar))
shoaib_ahmed 0:791a779d6220 139 return FALSE;
shoaib_ahmed 0:791a779d6220 140 ch = *termchar;
shoaib_ahmed 0:791a779d6220 141 while (ch != EOF && isspace(ch))
shoaib_ahmed 0:791a779d6220 142 ch = text_getc(file);
shoaib_ahmed 0:791a779d6220 143 if (isdigit(ch)) { /* oops, put it back */
shoaib_ahmed 0:791a779d6220 144 if (ungetc(ch, file) == EOF)
shoaib_ahmed 0:791a779d6220 145 return FALSE;
shoaib_ahmed 0:791a779d6220 146 ch = ' ';
shoaib_ahmed 0:791a779d6220 147 } else {
shoaib_ahmed 0:791a779d6220 148 /* Any separators other than ';' and ':' are ignored;
shoaib_ahmed 0:791a779d6220 149 * this allows user to insert commas, etc, if desired.
shoaib_ahmed 0:791a779d6220 150 */
shoaib_ahmed 0:791a779d6220 151 if (ch != EOF && ch != ';' && ch != ':')
shoaib_ahmed 0:791a779d6220 152 ch = ' ';
shoaib_ahmed 0:791a779d6220 153 }
shoaib_ahmed 0:791a779d6220 154 *termchar = ch;
shoaib_ahmed 0:791a779d6220 155 return TRUE;
shoaib_ahmed 0:791a779d6220 156 }
shoaib_ahmed 0:791a779d6220 157
shoaib_ahmed 0:791a779d6220 158
shoaib_ahmed 0:791a779d6220 159 GLOBAL(boolean)
shoaib_ahmed 0:791a779d6220 160 read_scan_script (j_compress_ptr cinfo, char * filename)
shoaib_ahmed 0:791a779d6220 161 /* Read a scan script from the specified text file.
shoaib_ahmed 0:791a779d6220 162 * Each entry in the file defines one scan to be emitted.
shoaib_ahmed 0:791a779d6220 163 * Entries are separated by semicolons ';'.
shoaib_ahmed 0:791a779d6220 164 * An entry contains one to four component indexes,
shoaib_ahmed 0:791a779d6220 165 * optionally followed by a colon ':' and four progressive-JPEG parameters.
shoaib_ahmed 0:791a779d6220 166 * The component indexes denote which component(s) are to be transmitted
shoaib_ahmed 0:791a779d6220 167 * in the current scan. The first component has index 0.
shoaib_ahmed 0:791a779d6220 168 * Sequential JPEG is used if the progressive-JPEG parameters are omitted.
shoaib_ahmed 0:791a779d6220 169 * The file is free format text: any whitespace may appear between numbers
shoaib_ahmed 0:791a779d6220 170 * and the ':' and ';' punctuation marks. Also, other punctuation (such
shoaib_ahmed 0:791a779d6220 171 * as commas or dashes) can be placed between numbers if desired.
shoaib_ahmed 0:791a779d6220 172 * Comments preceded by '#' may be included in the file.
shoaib_ahmed 0:791a779d6220 173 * Note: we do very little validity checking here;
shoaib_ahmed 0:791a779d6220 174 * jcmaster.c will validate the script parameters.
shoaib_ahmed 0:791a779d6220 175 */
shoaib_ahmed 0:791a779d6220 176 {
shoaib_ahmed 0:791a779d6220 177 FILE * fp;
shoaib_ahmed 0:791a779d6220 178 int scanno, ncomps, termchar;
shoaib_ahmed 0:791a779d6220 179 long val;
shoaib_ahmed 0:791a779d6220 180 jpeg_scan_info * scanptr;
shoaib_ahmed 0:791a779d6220 181 #define MAX_SCANS 100 /* quite arbitrary limit */
shoaib_ahmed 0:791a779d6220 182 jpeg_scan_info scans[MAX_SCANS];
shoaib_ahmed 0:791a779d6220 183
shoaib_ahmed 0:791a779d6220 184 if ((fp = fopen(filename, "r")) == NULL) {
shoaib_ahmed 0:791a779d6220 185 fprintf(stderr, "Can't open scan definition file %s\n", filename);
shoaib_ahmed 0:791a779d6220 186 return FALSE;
shoaib_ahmed 0:791a779d6220 187 }
shoaib_ahmed 0:791a779d6220 188 scanptr = scans;
shoaib_ahmed 0:791a779d6220 189 scanno = 0;
shoaib_ahmed 0:791a779d6220 190
shoaib_ahmed 0:791a779d6220 191 while (read_scan_integer(fp, &val, &termchar)) {
shoaib_ahmed 0:791a779d6220 192 if (scanno >= MAX_SCANS) {
shoaib_ahmed 0:791a779d6220 193 fprintf(stderr, "Too many scans defined in file %s\n", filename);
shoaib_ahmed 0:791a779d6220 194 fclose(fp);
shoaib_ahmed 0:791a779d6220 195 return FALSE;
shoaib_ahmed 0:791a779d6220 196 }
shoaib_ahmed 0:791a779d6220 197 scanptr->component_index[0] = (int) val;
shoaib_ahmed 0:791a779d6220 198 ncomps = 1;
shoaib_ahmed 0:791a779d6220 199 while (termchar == ' ') {
shoaib_ahmed 0:791a779d6220 200 if (ncomps >= MAX_COMPS_IN_SCAN) {
shoaib_ahmed 0:791a779d6220 201 fprintf(stderr, "Too many components in one scan in file %s\n",
shoaib_ahmed 0:791a779d6220 202 filename);
shoaib_ahmed 0:791a779d6220 203 fclose(fp);
shoaib_ahmed 0:791a779d6220 204 return FALSE;
shoaib_ahmed 0:791a779d6220 205 }
shoaib_ahmed 0:791a779d6220 206 if (! read_scan_integer(fp, &val, &termchar))
shoaib_ahmed 0:791a779d6220 207 goto bogus;
shoaib_ahmed 0:791a779d6220 208 scanptr->component_index[ncomps] = (int) val;
shoaib_ahmed 0:791a779d6220 209 ncomps++;
shoaib_ahmed 0:791a779d6220 210 }
shoaib_ahmed 0:791a779d6220 211 scanptr->comps_in_scan = ncomps;
shoaib_ahmed 0:791a779d6220 212 if (termchar == ':') {
shoaib_ahmed 0:791a779d6220 213 if (! read_scan_integer(fp, &val, &termchar) || termchar != ' ')
shoaib_ahmed 0:791a779d6220 214 goto bogus;
shoaib_ahmed 0:791a779d6220 215 scanptr->Ss = (int) val;
shoaib_ahmed 0:791a779d6220 216 if (! read_scan_integer(fp, &val, &termchar) || termchar != ' ')
shoaib_ahmed 0:791a779d6220 217 goto bogus;
shoaib_ahmed 0:791a779d6220 218 scanptr->Se = (int) val;
shoaib_ahmed 0:791a779d6220 219 if (! read_scan_integer(fp, &val, &termchar) || termchar != ' ')
shoaib_ahmed 0:791a779d6220 220 goto bogus;
shoaib_ahmed 0:791a779d6220 221 scanptr->Ah = (int) val;
shoaib_ahmed 0:791a779d6220 222 if (! read_scan_integer(fp, &val, &termchar))
shoaib_ahmed 0:791a779d6220 223 goto bogus;
shoaib_ahmed 0:791a779d6220 224 scanptr->Al = (int) val;
shoaib_ahmed 0:791a779d6220 225 } else {
shoaib_ahmed 0:791a779d6220 226 /* set non-progressive parameters */
shoaib_ahmed 0:791a779d6220 227 scanptr->Ss = 0;
shoaib_ahmed 0:791a779d6220 228 scanptr->Se = DCTSIZE2-1;
shoaib_ahmed 0:791a779d6220 229 scanptr->Ah = 0;
shoaib_ahmed 0:791a779d6220 230 scanptr->Al = 0;
shoaib_ahmed 0:791a779d6220 231 }
shoaib_ahmed 0:791a779d6220 232 if (termchar != ';' && termchar != EOF) {
shoaib_ahmed 0:791a779d6220 233 bogus:
shoaib_ahmed 0:791a779d6220 234 fprintf(stderr, "Invalid scan entry format in file %s\n", filename);
shoaib_ahmed 0:791a779d6220 235 fclose(fp);
shoaib_ahmed 0:791a779d6220 236 return FALSE;
shoaib_ahmed 0:791a779d6220 237 }
shoaib_ahmed 0:791a779d6220 238 scanptr++, scanno++;
shoaib_ahmed 0:791a779d6220 239 }
shoaib_ahmed 0:791a779d6220 240
shoaib_ahmed 0:791a779d6220 241 if (termchar != EOF) {
shoaib_ahmed 0:791a779d6220 242 fprintf(stderr, "Non-numeric data in file %s\n", filename);
shoaib_ahmed 0:791a779d6220 243 fclose(fp);
shoaib_ahmed 0:791a779d6220 244 return FALSE;
shoaib_ahmed 0:791a779d6220 245 }
shoaib_ahmed 0:791a779d6220 246
shoaib_ahmed 0:791a779d6220 247 if (scanno > 0) {
shoaib_ahmed 0:791a779d6220 248 /* Stash completed scan list in cinfo structure.
shoaib_ahmed 0:791a779d6220 249 * NOTE: for cjpeg's use, JPOOL_IMAGE is the right lifetime for this data,
shoaib_ahmed 0:791a779d6220 250 * but if you want to compress multiple images you'd want JPOOL_PERMANENT.
shoaib_ahmed 0:791a779d6220 251 */
shoaib_ahmed 0:791a779d6220 252 scanptr = (jpeg_scan_info *)
shoaib_ahmed 0:791a779d6220 253 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
shoaib_ahmed 0:791a779d6220 254 scanno * SIZEOF(jpeg_scan_info));
shoaib_ahmed 0:791a779d6220 255 MEMCOPY(scanptr, scans, scanno * SIZEOF(jpeg_scan_info));
shoaib_ahmed 0:791a779d6220 256 cinfo->scan_info = scanptr;
shoaib_ahmed 0:791a779d6220 257 cinfo->num_scans = scanno;
shoaib_ahmed 0:791a779d6220 258 }
shoaib_ahmed 0:791a779d6220 259
shoaib_ahmed 0:791a779d6220 260 fclose(fp);
shoaib_ahmed 0:791a779d6220 261 return TRUE;
shoaib_ahmed 0:791a779d6220 262 }
shoaib_ahmed 0:791a779d6220 263
shoaib_ahmed 0:791a779d6220 264 #endif /* C_MULTISCAN_FILES_SUPPORTED */
shoaib_ahmed 0:791a779d6220 265
shoaib_ahmed 0:791a779d6220 266
shoaib_ahmed 0:791a779d6220 267 GLOBAL(boolean)
shoaib_ahmed 0:791a779d6220 268 set_quality_ratings (j_compress_ptr cinfo, char *arg, boolean force_baseline)
shoaib_ahmed 0:791a779d6220 269 /* Process a quality-ratings parameter string, of the form
shoaib_ahmed 0:791a779d6220 270 * N[,N,...]
shoaib_ahmed 0:791a779d6220 271 * If there are more q-table slots than parameters, the last value is replicated.
shoaib_ahmed 0:791a779d6220 272 */
shoaib_ahmed 0:791a779d6220 273 {
shoaib_ahmed 0:791a779d6220 274 int val = 75; /* default value */
shoaib_ahmed 0:791a779d6220 275 int tblno;
shoaib_ahmed 0:791a779d6220 276 char ch;
shoaib_ahmed 0:791a779d6220 277
shoaib_ahmed 0:791a779d6220 278 for (tblno = 0; tblno < NUM_QUANT_TBLS; tblno++) {
shoaib_ahmed 0:791a779d6220 279 if (*arg) {
shoaib_ahmed 0:791a779d6220 280 ch = ','; /* if not set by sscanf, will be ',' */
shoaib_ahmed 0:791a779d6220 281 if (sscanf(arg, "%d%c", &val, &ch) < 1)
shoaib_ahmed 0:791a779d6220 282 return FALSE;
shoaib_ahmed 0:791a779d6220 283 if (ch != ',') /* syntax check */
shoaib_ahmed 0:791a779d6220 284 return FALSE;
shoaib_ahmed 0:791a779d6220 285 /* Convert user 0-100 rating to percentage scaling */
shoaib_ahmed 0:791a779d6220 286 cinfo->q_scale_factor[tblno] = jpeg_quality_scaling(val);
shoaib_ahmed 0:791a779d6220 287 while (*arg && *arg++ != ',') /* advance to next segment of arg string */
shoaib_ahmed 0:791a779d6220 288 ;
shoaib_ahmed 0:791a779d6220 289 } else {
shoaib_ahmed 0:791a779d6220 290 /* reached end of parameter, set remaining factors to last value */
shoaib_ahmed 0:791a779d6220 291 cinfo->q_scale_factor[tblno] = jpeg_quality_scaling(val);
shoaib_ahmed 0:791a779d6220 292 }
shoaib_ahmed 0:791a779d6220 293 }
shoaib_ahmed 0:791a779d6220 294 jpeg_default_qtables(cinfo, force_baseline);
shoaib_ahmed 0:791a779d6220 295 return TRUE;
shoaib_ahmed 0:791a779d6220 296 }
shoaib_ahmed 0:791a779d6220 297
shoaib_ahmed 0:791a779d6220 298
shoaib_ahmed 0:791a779d6220 299 GLOBAL(boolean)
shoaib_ahmed 0:791a779d6220 300 set_quant_slots (j_compress_ptr cinfo, char *arg)
shoaib_ahmed 0:791a779d6220 301 /* Process a quantization-table-selectors parameter string, of the form
shoaib_ahmed 0:791a779d6220 302 * N[,N,...]
shoaib_ahmed 0:791a779d6220 303 * If there are more components than parameters, the last value is replicated.
shoaib_ahmed 0:791a779d6220 304 */
shoaib_ahmed 0:791a779d6220 305 {
shoaib_ahmed 0:791a779d6220 306 int val = 0; /* default table # */
shoaib_ahmed 0:791a779d6220 307 int ci;
shoaib_ahmed 0:791a779d6220 308 char ch;
shoaib_ahmed 0:791a779d6220 309
shoaib_ahmed 0:791a779d6220 310 for (ci = 0; ci < MAX_COMPONENTS; ci++) {
shoaib_ahmed 0:791a779d6220 311 if (*arg) {
shoaib_ahmed 0:791a779d6220 312 ch = ','; /* if not set by sscanf, will be ',' */
shoaib_ahmed 0:791a779d6220 313 if (sscanf(arg, "%d%c", &val, &ch) < 1)
shoaib_ahmed 0:791a779d6220 314 return FALSE;
shoaib_ahmed 0:791a779d6220 315 if (ch != ',') /* syntax check */
shoaib_ahmed 0:791a779d6220 316 return FALSE;
shoaib_ahmed 0:791a779d6220 317 if (val < 0 || val >= NUM_QUANT_TBLS) {
shoaib_ahmed 0:791a779d6220 318 fprintf(stderr, "JPEG quantization tables are numbered 0..%d\n",
shoaib_ahmed 0:791a779d6220 319 NUM_QUANT_TBLS-1);
shoaib_ahmed 0:791a779d6220 320 return FALSE;
shoaib_ahmed 0:791a779d6220 321 }
shoaib_ahmed 0:791a779d6220 322 cinfo->comp_info[ci].quant_tbl_no = val;
shoaib_ahmed 0:791a779d6220 323 while (*arg && *arg++ != ',') /* advance to next segment of arg string */
shoaib_ahmed 0:791a779d6220 324 ;
shoaib_ahmed 0:791a779d6220 325 } else {
shoaib_ahmed 0:791a779d6220 326 /* reached end of parameter, set remaining components to last table */
shoaib_ahmed 0:791a779d6220 327 cinfo->comp_info[ci].quant_tbl_no = val;
shoaib_ahmed 0:791a779d6220 328 }
shoaib_ahmed 0:791a779d6220 329 }
shoaib_ahmed 0:791a779d6220 330 return TRUE;
shoaib_ahmed 0:791a779d6220 331 }
shoaib_ahmed 0:791a779d6220 332
shoaib_ahmed 0:791a779d6220 333
shoaib_ahmed 0:791a779d6220 334 GLOBAL(boolean)
shoaib_ahmed 0:791a779d6220 335 set_sample_factors (j_compress_ptr cinfo, char *arg)
shoaib_ahmed 0:791a779d6220 336 /* Process a sample-factors parameter string, of the form
shoaib_ahmed 0:791a779d6220 337 * HxV[,HxV,...]
shoaib_ahmed 0:791a779d6220 338 * If there are more components than parameters, "1x1" is assumed for the rest.
shoaib_ahmed 0:791a779d6220 339 */
shoaib_ahmed 0:791a779d6220 340 {
shoaib_ahmed 0:791a779d6220 341 int ci, val1, val2;
shoaib_ahmed 0:791a779d6220 342 char ch1, ch2;
shoaib_ahmed 0:791a779d6220 343
shoaib_ahmed 0:791a779d6220 344 for (ci = 0; ci < MAX_COMPONENTS; ci++) {
shoaib_ahmed 0:791a779d6220 345 if (*arg) {
shoaib_ahmed 0:791a779d6220 346 ch2 = ','; /* if not set by sscanf, will be ',' */
shoaib_ahmed 0:791a779d6220 347 if (sscanf(arg, "%d%c%d%c", &val1, &ch1, &val2, &ch2) < 3)
shoaib_ahmed 0:791a779d6220 348 return FALSE;
shoaib_ahmed 0:791a779d6220 349 if ((ch1 != 'x' && ch1 != 'X') || ch2 != ',') /* syntax check */
shoaib_ahmed 0:791a779d6220 350 return FALSE;
shoaib_ahmed 0:791a779d6220 351 if (val1 <= 0 || val1 > MAX_SAMP_FACTOR ||
shoaib_ahmed 0:791a779d6220 352 val2 <= 0 || val2 > MAX_SAMP_FACTOR) {
shoaib_ahmed 0:791a779d6220 353 fprintf(stderr, "JPEG sampling factors must be 1..%d\n", MAX_SAMP_FACTOR);
shoaib_ahmed 0:791a779d6220 354 return FALSE;
shoaib_ahmed 0:791a779d6220 355 }
shoaib_ahmed 0:791a779d6220 356 cinfo->comp_info[ci].h_samp_factor = val1;
shoaib_ahmed 0:791a779d6220 357 cinfo->comp_info[ci].v_samp_factor = val2;
shoaib_ahmed 0:791a779d6220 358 while (*arg && *arg++ != ',') /* advance to next segment of arg string */
shoaib_ahmed 0:791a779d6220 359 ;
shoaib_ahmed 0:791a779d6220 360 } else {
shoaib_ahmed 0:791a779d6220 361 /* reached end of parameter, set remaining components to 1x1 sampling */
shoaib_ahmed 0:791a779d6220 362 cinfo->comp_info[ci].h_samp_factor = 1;
shoaib_ahmed 0:791a779d6220 363 cinfo->comp_info[ci].v_samp_factor = 1;
shoaib_ahmed 0:791a779d6220 364 }
shoaib_ahmed 0:791a779d6220 365 }
shoaib_ahmed 0:791a779d6220 366 return TRUE;
shoaib_ahmed 0:791a779d6220 367 }