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79 if (
c >=
'a' &&
c <=
'f')
82 if (
c >=
'0' &&
c <=
'9')
93 if ((in_end - in_start) != 36)
96 for (
i = 0, cp = in_start;
i < 16;
i++) {
100 if (
i == 4 ||
i == 6 ||
i == 8 ||
i == 10)
106 if (hi == -1 || lo == -1)
109 uu[
i] = (hi << 4) + lo;
121 for (
int i = 0;
i < 16;
i++) {
124 if (
i == 4 ||
i == 6 ||
i == 8 ||
i == 10)
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
uint8_t AVUUID[AV_UUID_LEN]
char * av_stristr(const char *s1, const char *s2)
Locate the first case-independent occurrence in the string haystack of the string needle.
void av_uuid_unparse(const AVUUID uuid, char *out)
Serializes a AVUUID into a string representation according to IETF RFC 4122.
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 const char hexdigits_lower[16]
int av_uuid_parse(const char *in, AVUUID uu)
Parses a string representation of a UUID formatted according to IETF RFC 4122 into an AVUUID.
static int xdigit_to_int(char c)
#define i(width, name, range_min, range_max)
int av_uuid_parse_range(const char *in_start, const char *in_end, AVUUID uu)
Parses a string representation of a UUID formatted according to IETF RFC 4122 into an AVUUID.
static av_const int av_tolower(int c)
Locale-independent conversion of ASCII characters to lowercase.
int av_uuid_urn_parse(const char *in, AVUUID uu)
Parses a URN representation of a UUID, as specified at IETF RFC 4122, into an AVUUID.