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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;
90 return len + strlen(
src) - 1;
95 size_t len = strlen(dst);
103 size_t len = strlen(dst);
147 #define WHITESPACES " \n\t\r"
153 const char *p = *
buf;
158 while (*p && !strspn(p, term)) {
160 if (
c ==
'\\' && *p) {
163 }
else if (
c ==
'\'') {
164 while (*p && *p !=
'\'')
188 if (!
s && !(
s = *saveptr))
192 s += strspn(
s, delim);
202 s += strcspn(
s, delim);
231 }
while (--n &&
c1 &&
c1 ==
c2);
238 const char *pstr2, *pstr =
str;
239 size_t tolen = strlen(
to), fromlen = strlen(
from);
245 pstr = pstr2 + fromlen;
265 if (!path || *path ==
'\0')
268 p = strrchr(path,
'/');
270 q = strrchr(path,
'\\');
271 d = strchr(path,
':');
283 char *p = path ? strrchr(path,
'/') :
NULL;
286 char *q = path ? strrchr(path,
'\\') :
NULL;
287 char *d = path ? strchr(path,
':') :
NULL;
312 p_len = strlen(path);
313 c_len = strlen(component);
314 if (p_len > SIZE_MAX - c_len || p_len + c_len > SIZE_MAX - 2)
321 if (fullpath[p_len - 1] !=
'/' && component[0] !=
'/')
322 fullpath[p_len++] =
'/';
323 else if (fullpath[p_len - 1] ==
'/' && component[0] ==
'/')
327 av_strlcpy(&fullpath[p_len], component, c_len + 1);
328 fullpath[p_len + c_len] = 0;
358 namelen = strlen(
name);
360 int negate =
'-' == *names;
361 p = strchr(names,
',');
363 p = names + strlen(names);
368 names = p + (*p ==
',');
379 int ret = 0, tail_len;
380 uint32_t overlong_encoding_mins[6] = {
381 0x00000000, 0x00000080, 0x00000800, 0x00010000, 0x00200000, 0x04000000,
391 if ((
code & 0xc0) == 0x80 ||
code >= 0xFE) {
395 top = (
code & 128) >> 1;
415 code &= (top << 1) - 1;
419 if (
code < overlong_encoding_mins[tail_len]) {
424 if (
code >= 1
U<<31) {
431 if (
code > 0x10FFFF &&
437 if (
code >= 0xD800 &&
code <= 0xDFFF &&
440 if ((
code == 0xFFFE ||
code == 0xFFFF) &&
453 for (p =
name; p && *p; ) {
454 for (q =
list; q && *q; ) {
456 for (k = 0; p[k] == q[k] || (p[k]*q[k] == 0 && p[k]+q[k] == separator); k++)
457 if (k && (!p[k] || p[k] == separator))
459 q = strchr(q, separator);
462 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...
#define AV_BPRINT_SIZE_UNLIMITED
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default minimum maximum flags name is the option name
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
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
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_stristr(const char *s1, const char *s2)
Locate the first case-independent occurrence in the string haystack of the string needle.
#define AV_UTF8_FLAG_ACCEPT_NON_CHARACTERS
accept non-characters - 0xFFFE and 0xFFFF
char * av_asprintf(const char *fmt,...)
int av_strcasecmp(const char *a, const char *b)
Locale-independent case-insensitive compare.
static av_cold int end(AVCodecContext *avctx)
char * av_d2str(double d)
Convert a number to an av_malloced string.
void av_bprint_append_data(AVBPrint *buf, const char *data, unsigned size)
Append data to a print buffer.
#define AV_UTF8_FLAG_ACCEPT_SURROGATES
accept UTF-16 surrogates codes
size_t av_strlcatf(char *dst, size_t size, const char *fmt,...)
const char * av_basename(const char *path)
Thread safe basename.
char * av_append_path_component(const char *path, const char *component)
Append path component to the existing path.
#define AV_UTF8_FLAG_EXCLUDE_XML_INVALID_CONTROL_CODES
exclude control codes not accepted by XML
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 ...
const char * av_dirname(char *path)
Thread safe dirname.
#define AV_UTF8_FLAG_ACCEPT_INVALID_BIG_CODES
accept codepoints over 0x10FFFF
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().
#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.
int av_match_list(const char *name, const char *list, char separator)
Check if a name is in a list.
char * av_strireplace(const char *str, const char *from, const char *to)
Locale-independent strings replace.
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
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
static int av_bprint_is_complete(const AVBPrint *buf)
Test if the print buffer is complete (not truncated).
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_strstart(const char *str, const char *pfx, const char **ptr)
Return non-zero if pfx is a prefix of str.
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
static av_const int av_toupper(int c)
Locale-independent conversion of ASCII characters to uppercase.
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,...
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...
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.
int av_match_name(const char *name, const char *names)
Match instances of a name in a comma-separated list of names.
char * av_strdup(const char *s)
Duplicate a string.
#define flags(name, subs,...)
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.
static av_const int av_tolower(int c)
Locale-independent conversion of ASCII characters to lowercase.