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FFmpeg/libavfilter/parseutils.c
Måns Rullgård 49bd8e4b84 Fix grammar errors in documentation 
Originally committed as revision 23904 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-06-30 15:38:06 +00:00

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/*
* copyright (c) 2009 Stefano Sabatini
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* parsing utils
*/
#include <strings.h>
#include "libavutil/avutil.h"
#include "libavutil/avstring.h"
#include "libavutil/random_seed.h"
#include "parseutils.h"
#define WHITESPACES " \n\t"
char *av_get_token(const char **buf, const char *term)
{
char *out = av_malloc(strlen(*buf) + 1);
char *ret= out, *end= out;
const char *p = *buf;
if (!out) return NULL;
p += strspn(p, WHITESPACES);
while(*p && !strspn(p, term)) {
char c = *p++;
if(c == '\\' && *p){
*out++ = *p++;
end= out;
}else if(c == '\''){
while(*p && *p != '\'')
*out++ = *p++;
if(*p){
p++;
end= out;
}
}else{
*out++ = c;
}
}
do{
*out-- = 0;
}while(out >= end && strspn(out, WHITESPACES));
*buf = p;
return ret;
}
typedef struct {
const char *name; ///< a string representing the name of the color
uint8_t rgb_color[3]; ///< RGB values for the color
} ColorEntry;
static ColorEntry color_table[] = {
{ "AliceBlue", { 0xF0, 0xF8, 0xFF } },
{ "AntiqueWhite", { 0xFA, 0xEB, 0xD7 } },
{ "Aqua", { 0x00, 0xFF, 0xFF } },
{ "Aquamarine", { 0x7F, 0xFF, 0xD4 } },
{ "Azure", { 0xF0, 0xFF, 0xFF } },
{ "Beige", { 0xF5, 0xF5, 0xDC } },
{ "Bisque", { 0xFF, 0xE4, 0xC4 } },
{ "Black", { 0x00, 0x00, 0x00 } },
{ "BlanchedAlmond", { 0xFF, 0xEB, 0xCD } },
{ "Blue", { 0x00, 0x00, 0xFF } },
{ "BlueViolet", { 0x8A, 0x2B, 0xE2 } },
{ "Brown", { 0xA5, 0x2A, 0x2A } },
{ "BurlyWood", { 0xDE, 0xB8, 0x87 } },
{ "CadetBlue", { 0x5F, 0x9E, 0xA0 } },
{ "Chartreuse", { 0x7F, 0xFF, 0x00 } },
{ "Chocolate", { 0xD2, 0x69, 0x1E } },
{ "Coral", { 0xFF, 0x7F, 0x50 } },
{ "CornflowerBlue", { 0x64, 0x95, 0xED } },
{ "Cornsilk", { 0xFF, 0xF8, 0xDC } },
{ "Crimson", { 0xDC, 0x14, 0x3C } },
{ "Cyan", { 0x00, 0xFF, 0xFF } },
{ "DarkBlue", { 0x00, 0x00, 0x8B } },
{ "DarkCyan", { 0x00, 0x8B, 0x8B } },
{ "DarkGoldenRod", { 0xB8, 0x86, 0x0B } },
{ "DarkGray", { 0xA9, 0xA9, 0xA9 } },
{ "DarkGreen", { 0x00, 0x64, 0x00 } },
{ "DarkKhaki", { 0xBD, 0xB7, 0x6B } },
{ "DarkMagenta", { 0x8B, 0x00, 0x8B } },
{ "DarkOliveGreen", { 0x55, 0x6B, 0x2F } },
{ "Darkorange", { 0xFF, 0x8C, 0x00 } },
{ "DarkOrchid", { 0x99, 0x32, 0xCC } },
{ "DarkRed", { 0x8B, 0x00, 0x00 } },
{ "DarkSalmon", { 0xE9, 0x96, 0x7A } },
{ "DarkSeaGreen", { 0x8F, 0xBC, 0x8F } },
{ "DarkSlateBlue", { 0x48, 0x3D, 0x8B } },
{ "DarkSlateGray", { 0x2F, 0x4F, 0x4F } },
{ "DarkTurquoise", { 0x00, 0xCE, 0xD1 } },
{ "DarkViolet", { 0x94, 0x00, 0xD3 } },
{ "DeepPink", { 0xFF, 0x14, 0x93 } },
{ "DeepSkyBlue", { 0x00, 0xBF, 0xFF } },
{ "DimGray", { 0x69, 0x69, 0x69 } },
{ "DodgerBlue", { 0x1E, 0x90, 0xFF } },
{ "FireBrick", { 0xB2, 0x22, 0x22 } },
{ "FloralWhite", { 0xFF, 0xFA, 0xF0 } },
{ "ForestGreen", { 0x22, 0x8B, 0x22 } },
{ "Fuchsia", { 0xFF, 0x00, 0xFF } },
{ "Gainsboro", { 0xDC, 0xDC, 0xDC } },
{ "GhostWhite", { 0xF8, 0xF8, 0xFF } },
{ "Gold", { 0xFF, 0xD7, 0x00 } },
{ "GoldenRod", { 0xDA, 0xA5, 0x20 } },
{ "Gray", { 0x80, 0x80, 0x80 } },
{ "Green", { 0x00, 0x80, 0x00 } },
{ "GreenYellow", { 0xAD, 0xFF, 0x2F } },
{ "HoneyDew", { 0xF0, 0xFF, 0xF0 } },
{ "HotPink", { 0xFF, 0x69, 0xB4 } },
{ "IndianRed", { 0xCD, 0x5C, 0x5C } },
{ "Indigo", { 0x4B, 0x00, 0x82 } },
{ "Ivory", { 0xFF, 0xFF, 0xF0 } },
{ "Khaki", { 0xF0, 0xE6, 0x8C } },
{ "Lavender", { 0xE6, 0xE6, 0xFA } },
{ "LavenderBlush", { 0xFF, 0xF0, 0xF5 } },
{ "LawnGreen", { 0x7C, 0xFC, 0x00 } },
{ "LemonChiffon", { 0xFF, 0xFA, 0xCD } },
{ "LightBlue", { 0xAD, 0xD8, 0xE6 } },
{ "LightCoral", { 0xF0, 0x80, 0x80 } },
{ "LightCyan", { 0xE0, 0xFF, 0xFF } },
{ "LightGoldenRodYellow", { 0xFA, 0xFA, 0xD2 } },
{ "LightGrey", { 0xD3, 0xD3, 0xD3 } },
{ "LightGreen", { 0x90, 0xEE, 0x90 } },
{ "LightPink", { 0xFF, 0xB6, 0xC1 } },
{ "LightSalmon", { 0xFF, 0xA0, 0x7A } },
{ "LightSeaGreen", { 0x20, 0xB2, 0xAA } },
{ "LightSkyBlue", { 0x87, 0xCE, 0xFA } },
{ "LightSlateGray", { 0x77, 0x88, 0x99 } },
{ "LightSteelBlue", { 0xB0, 0xC4, 0xDE } },
{ "LightYellow", { 0xFF, 0xFF, 0xE0 } },
{ "Lime", { 0x00, 0xFF, 0x00 } },
{ "LimeGreen", { 0x32, 0xCD, 0x32 } },
{ "Linen", { 0xFA, 0xF0, 0xE6 } },
{ "Magenta", { 0xFF, 0x00, 0xFF } },
{ "Maroon", { 0x80, 0x00, 0x00 } },
{ "MediumAquaMarine", { 0x66, 0xCD, 0xAA } },
{ "MediumBlue", { 0x00, 0x00, 0xCD } },
{ "MediumOrchid", { 0xBA, 0x55, 0xD3 } },
{ "MediumPurple", { 0x93, 0x70, 0xD8 } },
{ "MediumSeaGreen", { 0x3C, 0xB3, 0x71 } },
{ "MediumSlateBlue", { 0x7B, 0x68, 0xEE } },
{ "MediumSpringGreen", { 0x00, 0xFA, 0x9A } },
{ "MediumTurquoise", { 0x48, 0xD1, 0xCC } },
{ "MediumVioletRed", { 0xC7, 0x15, 0x85 } },
{ "MidnightBlue", { 0x19, 0x19, 0x70 } },
{ "MintCream", { 0xF5, 0xFF, 0xFA } },
{ "MistyRose", { 0xFF, 0xE4, 0xE1 } },
{ "Moccasin", { 0xFF, 0xE4, 0xB5 } },
{ "NavajoWhite", { 0xFF, 0xDE, 0xAD } },
{ "Navy", { 0x00, 0x00, 0x80 } },
{ "OldLace", { 0xFD, 0xF5, 0xE6 } },
{ "Olive", { 0x80, 0x80, 0x00 } },
{ "OliveDrab", { 0x6B, 0x8E, 0x23 } },
{ "Orange", { 0xFF, 0xA5, 0x00 } },
{ "OrangeRed", { 0xFF, 0x45, 0x00 } },
{ "Orchid", { 0xDA, 0x70, 0xD6 } },
{ "PaleGoldenRod", { 0xEE, 0xE8, 0xAA } },
{ "PaleGreen", { 0x98, 0xFB, 0x98 } },
{ "PaleTurquoise", { 0xAF, 0xEE, 0xEE } },
{ "PaleVioletRed", { 0xD8, 0x70, 0x93 } },
{ "PapayaWhip", { 0xFF, 0xEF, 0xD5 } },
{ "PeachPuff", { 0xFF, 0xDA, 0xB9 } },
{ "Peru", { 0xCD, 0x85, 0x3F } },
{ "Pink", { 0xFF, 0xC0, 0xCB } },
{ "Plum", { 0xDD, 0xA0, 0xDD } },
{ "PowderBlue", { 0xB0, 0xE0, 0xE6 } },
{ "Purple", { 0x80, 0x00, 0x80 } },
{ "Red", { 0xFF, 0x00, 0x00 } },
{ "RosyBrown", { 0xBC, 0x8F, 0x8F } },
{ "RoyalBlue", { 0x41, 0x69, 0xE1 } },
{ "SaddleBrown", { 0x8B, 0x45, 0x13 } },
{ "Salmon", { 0xFA, 0x80, 0x72 } },
{ "SandyBrown", { 0xF4, 0xA4, 0x60 } },
{ "SeaGreen", { 0x2E, 0x8B, 0x57 } },
{ "SeaShell", { 0xFF, 0xF5, 0xEE } },
{ "Sienna", { 0xA0, 0x52, 0x2D } },
{ "Silver", { 0xC0, 0xC0, 0xC0 } },
{ "SkyBlue", { 0x87, 0xCE, 0xEB } },
{ "SlateBlue", { 0x6A, 0x5A, 0xCD } },
{ "SlateGray", { 0x70, 0x80, 0x90 } },
{ "Snow", { 0xFF, 0xFA, 0xFA } },
{ "SpringGreen", { 0x00, 0xFF, 0x7F } },
{ "SteelBlue", { 0x46, 0x82, 0xB4 } },
{ "Tan", { 0xD2, 0xB4, 0x8C } },
{ "Teal", { 0x00, 0x80, 0x80 } },
{ "Thistle", { 0xD8, 0xBF, 0xD8 } },
{ "Tomato", { 0xFF, 0x63, 0x47 } },
{ "Turquoise", { 0x40, 0xE0, 0xD0 } },
{ "Violet", { 0xEE, 0x82, 0xEE } },
{ "Wheat", { 0xF5, 0xDE, 0xB3 } },
{ "White", { 0xFF, 0xFF, 0xFF } },
{ "WhiteSmoke", { 0xF5, 0xF5, 0xF5 } },
{ "Yellow", { 0xFF, 0xFF, 0x00 } },
{ "YellowGreen", { 0x9A, 0xCD, 0x32 } },
};
static int color_table_compare(const void *lhs, const void *rhs)
{
return strcasecmp(lhs, ((const ColorEntry *)rhs)->name);
}
#define ALPHA_SEP '@'
int av_parse_color(uint8_t *rgba_color, const char *color_string, void *log_ctx)
{
char *tail, color_string2[128];
const ColorEntry *entry;
av_strlcpy(color_string2, color_string, sizeof(color_string2));
if ((tail = strchr(color_string2, ALPHA_SEP)))
*tail++ = 0;
rgba_color[3] = 255;
if (!strcasecmp(color_string2, "random") || !strcasecmp(color_string2, "bikeshed")) {
int rgba = av_get_random_seed();
rgba_color[0] = rgba >> 24;
rgba_color[1] = rgba >> 16;
rgba_color[2] = rgba >> 8;
rgba_color[3] = rgba;
} else if (!strncmp(color_string2, "0x", 2)) {
char *tail;
int len = strlen(color_string2);
unsigned int rgba = strtoul(color_string2, &tail, 16);
if (*tail || (len != 8 && len != 10)) {
av_log(log_ctx, AV_LOG_ERROR, "Invalid 0xRRGGBB[AA] color string: '%s'\n", color_string2);
return AVERROR(EINVAL);
}
if (len == 10) {
rgba_color[3] = rgba;
rgba >>= 8;
}
rgba_color[0] = rgba >> 16;
rgba_color[1] = rgba >> 8;
rgba_color[2] = rgba;
} else {
entry = bsearch(color_string2,
color_table,
FF_ARRAY_ELEMS(color_table),
sizeof(ColorEntry),
color_table_compare);
if (!entry) {
av_log(log_ctx, AV_LOG_ERROR, "Cannot find color '%s'\n", color_string2);
return AVERROR(EINVAL);
}
memcpy(rgba_color, entry->rgb_color, 3);
}
if (tail) {
unsigned long int alpha;
const char *alpha_string = tail;
if (!strncmp(alpha_string, "0x", 2)) {
alpha = strtoul(alpha_string, &tail, 16);
} else {
alpha = strtoul(alpha_string, &tail, 10);
if (*tail) {
double d = strtod(alpha_string, &tail);
alpha = d * 255;
}
}
if (tail == alpha_string || *tail || alpha > 255) {
av_log(log_ctx, AV_LOG_ERROR, "Invalid alpha value specifier '%s' in '%s'\n",
alpha_string, color_string);
return AVERROR(EINVAL);
}
rgba_color[3] = alpha;
}
return 0;
}
/**
* Store the value in the field in ctx that is named like key.
* ctx must be an AVClass context, storing is done using AVOptions.
*
* @param buf the string to parse, buf will be updated to point at the
* separator just after the parsed key/value pair
* @param key_val_sep a 0-terminated list of characters used to
* separate key from value
* @param pairs_sep a 0-terminated list of characters used to separate
* two pairs from each other
* @return 0 if the key/value pair has been successfully parsed and
* set, or a negative value corresponding to an AVERROR code in case
* of error:
* AVERROR(EINVAL) if the key/value pair cannot be parsed,
* the error code issued by av_set_string3() if the key/value pair
* cannot be set
*/
static int parse_key_value_pair(void *ctx, const char **buf,
const char *key_val_sep, const char *pairs_sep)
{
char *key = av_get_token(buf, key_val_sep);
char *val;
int ret;
if (*key && strspn(*buf, key_val_sep)) {
(*buf)++;
val = av_get_token(buf, pairs_sep);
} else {
av_log(ctx, AV_LOG_ERROR, "Missing key or no key/value separator found after key '%s'\n", key);
av_free(key);
return AVERROR(EINVAL);
}
av_log(ctx, AV_LOG_DEBUG, "Setting value '%s' for key '%s'\n", val, key);
ret = av_set_string3(ctx, key, val, 1, NULL);
if (ret == AVERROR(ENOENT))
av_log(ctx, AV_LOG_ERROR, "Key '%s' not found.\n", key);
av_free(key);
av_free(val);
return ret;
}
int av_set_options_string(void *ctx, const char *opts,
const char *key_val_sep, const char *pairs_sep)
{
int ret, count = 0;
while (*opts) {
if ((ret = parse_key_value_pair(ctx, &opts, key_val_sep, pairs_sep)) < 0)
return ret;
count++;
if (*opts)
opts++;
}
return count;
}
#ifdef TEST
#undef printf
typedef struct TestContext
{
const AVClass *class;
int num;
int toggle;
char *string;
int flags;
AVRational rational;
} TestContext;
#define OFFSET(x) offsetof(TestContext, x)
#define TEST_FLAG_COOL 01
#define TEST_FLAG_LAME 02
#define TEST_FLAG_MU 04
static const AVOption test_options[]= {
{"num", "set num", OFFSET(num), FF_OPT_TYPE_INT, 0, 0, 100 },
{"toggle", "set toggle", OFFSET(toggle), FF_OPT_TYPE_INT, 0, 0, 1 },
{"rational", "set rational", OFFSET(rational), FF_OPT_TYPE_RATIONAL, 0, 0, 10 },
{"string", "set string", OFFSET(string), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX },
{"flags", "set flags", OFFSET(flags), FF_OPT_TYPE_FLAGS, 0, 0, INT_MAX, 0, "flags" },
{"cool", "set cool flag ", 0, FF_OPT_TYPE_CONST, TEST_FLAG_COOL, INT_MIN, INT_MAX, 0, "flags" },
{"lame", "set lame flag ", 0, FF_OPT_TYPE_CONST, TEST_FLAG_LAME, INT_MIN, INT_MAX, 0, "flags" },
{"mu", "set mu flag ", 0, FF_OPT_TYPE_CONST, TEST_FLAG_MU, INT_MIN, INT_MAX, 0, "flags" },
{NULL},
};
static const char *test_get_name(void *ctx)
{
return "test";
}
static const AVClass test_class = {
"TestContext",
test_get_name,
test_options
};
int main(void)
{
int i;
const char *strings[] = {
"''",
"",
":",
"\\",
"'",
" '' :",
" '' '' :",
"foo '' :",
"'foo'",
"foo ",
"foo\\",
"foo': blah:blah",
"foo\\: blah:blah",
"foo\'",
"'foo : ' :blahblah",
"\\ :blah",
" foo",
" foo ",
" foo \\ ",
"foo ':blah",
" foo bar : blahblah",
"\\f\\o\\o",
"'foo : \\ \\ ' : blahblah",
"'\\fo\\o:': blahblah",
"\\'fo\\o\\:': foo ' :blahblah"
};
for (i=0; i < FF_ARRAY_ELEMS(strings); i++) {
const char *p= strings[i];
printf("|%s|", p);
printf(" -> |%s|", av_get_token(&p, ":"));
printf(" + |%s|\n", p);
}
printf("\nTesting av_parse_color()\n");
{
uint8_t rgba[4];
const char *color_names[] = {
"bikeshed",
"RaNdOm",
"foo",
"red",
"Red ",
"RED",
"Violet",
"Yellow",
"Red",
"0x000000",
"0x0000000",
"0xff000000",
"0x3e34ff",
"0x3e34ffaa",
"0xffXXee",
"0xfoobar",
"0xffffeeeeeeee",
"red@foo",
"random@10",
"0xff0000@1.0",
"red@",
"red@0xfff",
"red@0xf",
"red@2",
"red@0.1",
"red@-1",
"red@0.5",
"red@1.0",
"red@256",
"red@10foo",
"red@-1.0",
"red@-0.0",
};
av_log_set_level(AV_LOG_DEBUG);
for (int i = 0; i < FF_ARRAY_ELEMS(color_names); i++) {
if (av_parse_color(rgba, color_names[i], NULL) >= 0)
printf("%s -> R(%d) G(%d) B(%d) A(%d)\n", color_names[i], rgba[0], rgba[1], rgba[2], rgba[3]);
}
}
printf("\nTesting av_set_options_string()\n");
{
TestContext test_ctx;
const char *options[] = {
"",
":",
"=",
"foo=:",
":=foo",
"=foo",
"foo=",
"foo",
"foo=val",
"foo==val",
"toggle=:",
"string=:",
"toggle=1 : foo",
"toggle=100",
"toggle==1",
"flags=+mu-lame : num=42: toggle=0",
"num=42 : string=blahblah",
"rational=0 : rational=1/2 : rational=1/-1",
"rational=-1/0",
};
test_ctx.class = &test_class;
av_opt_set_defaults2(&test_ctx, 0, 0);
test_ctx.string = av_strdup("default");
av_log_set_level(AV_LOG_DEBUG);
for (i=0; i < FF_ARRAY_ELEMS(options); i++) {
av_log(&test_ctx, AV_LOG_DEBUG, "Setting options string '%s'\n", options[i]);
if (av_set_options_string(&test_ctx, options[i], "=", ":") < 0)
av_log(&test_ctx, AV_LOG_ERROR, "Error setting options string: '%s'\n", options[i]);
printf("\n");
}
}
return 0;
}
#endif
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