36 while (*pfx && *pfx == *str) {
59 return (
char*)(intptr_t)s1;
63 return (
char*)(intptr_t)s1;
69 char *
av_strnstr(
const char *haystack,
const char *needle,
size_t hay_length)
71 size_t needle_len = strlen(needle);
73 return (
char*)haystack;
74 while (hay_length >= needle_len) {
76 if (!memcmp(haystack, needle, needle_len))
77 return (
char*)haystack;
86 while (++len < size && *src)
90 return len + strlen(src) - 1;
95 size_t len = strlen(dst);
97 return len + strlen(src);
98 return len +
av_strlcpy(dst + len, src, size - len);
103 size_t len = strlen(dst);
107 len +=
vsnprintf(dst + len, size > len ? size - len : 0, fmt, vl);
149 #define WHITESPACES " \n\t\r" 155 const char *p = *
buf;
160 while (*p && !strspn(p, term)) {
162 if (c ==
'\\' && *p) {
165 }
else if (c ==
'\'') {
166 while (*p && *p !=
'\'')
190 if (!s && !(s = *saveptr))
194 s += strspn(s, delim);
204 s += strcspn(s, delim);
221 }
while (c1 && c1 == c2);
233 }
while (--n && c1 && c1 == c2);
240 const char *pstr2, *pstr =
str;
241 size_t tolen = strlen(to), fromlen = strlen(from);
247 pstr = pstr2 + fromlen;
267 if (!path || *path ==
'\0')
270 p = strrchr(path,
'/');
272 q = strrchr(path,
'\\');
273 d = strchr(path,
':');
285 char *p = path ? strrchr(path,
'/') :
NULL;
288 char *q = path ? strrchr(path,
'\\') :
NULL;
289 char *d = path ? strchr(path,
':') :
NULL;
314 p_len = strlen(path);
315 c_len = strlen(component);
316 if (p_len > SIZE_MAX - c_len || p_len + c_len > SIZE_MAX - 2)
323 if (fullpath[p_len - 1] !=
'/' && component[0] !=
'/')
324 fullpath[p_len++] =
'/';
325 else if (fullpath[p_len - 1] ==
'/' && component[0] ==
'/')
329 av_strlcpy(&fullpath[p_len], component, c_len + 1);
330 fullpath[p_len + c_len] = 0;
360 namelen = strlen(name);
362 int negate =
'-' == *names;
363 p = strchr(names,
',');
365 p = names + strlen(names);
367 len =
FFMAX(p - names, namelen);
370 names = p + (*p ==
',');
381 int ret = 0, tail_len;
382 uint32_t overlong_encoding_mins[6] = {
383 0x00000000, 0x00000080, 0x00000800, 0x00010000, 0x00200000, 0x04000000,
393 if ((code & 0xc0) == 0x80 || code >= 0xFE) {
397 top = (code & 128) >> 1;
414 code = (code<<6) + tmp;
417 code &= (top << 1) - 1;
421 if (code < overlong_encoding_mins[tail_len]) {
426 if (code >= 1
U<<31) {
433 if (code > 0x10FFFF &&
436 if (code < 0x20 && code != 0x9 && code != 0xA && code != 0xD &&
439 if (code >= 0xD800 && code <= 0xDFFF &&
442 if ((code == 0xFFFE || code == 0xFFFF) &&
455 for (p = name; p && *p; ) {
456 for (q = list; q && *q; ) {
458 for (k = 0; p[k] == q[k] || (p[k]*q[k] == 0 && p[k]+q[k] == separator); k++)
459 if (k && (!p[k] || p[k] == separator))
461 q = strchr(q, separator);
464 p = strchr(p, separator);
int av_utf8_decode(int32_t *codep, const uint8_t **bufp, const uint8_t *buf_end, unsigned int flags)
Read and decode a single UTF-8 code point (character) from the buffer in *buf, and update *buf to poi...
Memory handling functions.
char * av_stristr(const char *s1, const char *s2)
Locate the first case-independent occurrence in the string haystack of the string needle...
int av_escape(char **dst, const char *src, const char *special_chars, enum AVEscapeMode mode, int flags)
Escape string in src, and put the escaped string in an allocated string in *dst, which must be freed ...
int av_strncasecmp(const char *a, const char *b, size_t n)
Locale-independent case-insensitive compare.
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
char * av_d2str(double d)
Convert a number to an av_malloced string.
#define av_assert0(cond)
assert() equivalent, that is always enabled.
int av_stristart(const char *str, const char *pfx, const char **ptr)
Return non-zero if pfx is a prefix of str independent of case.
const char * av_basename(const char *path)
Thread safe basename.
static av_cold int end(AVCodecContext *avctx)
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
void av_bprint_append_data(AVBPrint *buf, const char *data, unsigned size)
Append data to a print buffer.
#define AV_UTF8_FLAG_ACCEPT_INVALID_BIG_CODES
accept codepoints over 0x10FFFF
#define AV_UTF8_FLAG_ACCEPT_SURROGATES
accept UTF-16 surrogates codes
static av_const int av_tolower(int c)
Locale-independent conversion of ASCII characters to lowercase.
#define AV_BPRINT_SIZE_UNLIMITED
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
int av_match_list(const char *name, const char *list, char separator)
Check if a name is in a list.
simple assert() macros that are a bit more flexible than ISO C assert().
char * av_strireplace(const char *str, const char *from, const char *to)
Locale-independent strings replace.
int av_match_name(const char *name, const char *names)
Match instances of a name in a comma-separated list of names.
size_t av_strlcpy(char *dst, const char *src, size_t size)
Copy the string src to dst, but no more than size - 1 bytes, and null-terminate dst.
char * av_get_token(const char **buf, const char *term)
Unescape the given string until a non escaped terminating char, and return the token corresponding to...
char * av_asprintf(const char *fmt,...)
#define AV_UTF8_FLAG_EXCLUDE_XML_INVALID_CONTROL_CODES
exclude control codes not accepted by XML
int av_strcasecmp(const char *a, const char *b)
Locale-independent case-insensitive compare.
static int av_bprint_is_complete(const AVBPrint *buf)
Test if the print buffer is complete (not truncated).
char * av_strdup(const char *s)
Duplicate a string.
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining list
static av_const int av_toupper(int c)
Locale-independent conversion of ASCII characters to uppercase.
size_t av_strlcatf(char *dst, size_t size, const char *fmt,...)
size_t av_strlcat(char *dst, const char *src, size_t size)
Append the string src to the string dst, but to a total length of no more than size - 1 bytes...
#define flags(name, subs,...)
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code
char * av_strtok(char *s, const char *delim, char **saveptr)
Split the string into several tokens which can be accessed by successive calls to av_strtok()...
int av_strstart(const char *str, const char *pfx, const char **ptr)
Return non-zero if pfx is a prefix of str.
char * av_append_path_component(const char *path, const char *component)
Append path component to the existing path.
void av_bprint_escape(AVBPrint *dstbuf, const char *src, const char *special_chars, enum AVEscapeMode mode, int flags)
Escape the content in src and append it to dstbuf.
char * av_strnstr(const char *haystack, const char *needle, size_t hay_length)
Locate the first occurrence of the string needle in the string haystack where not more than hay_lengt...
common internal and external API header
const char * av_dirname(char *path)
Thread safe dirname.
#define AV_UTF8_FLAG_ACCEPT_NON_CHARACTERS
accept non-characters - 0xFFFE and 0xFFFF
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
mode
Use these values in ebur128_init (or'ed).