34 #elif HAVE_MAPVIEWOFFILE 72 if (fstat(fd, &st) < 0) {
80 off_size = st.st_size;
81 if (off_size > SIZE_MAX) {
83 "File size for file '%s' is too big\n", filename);
95 ptr = mmap(
NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
96 if (ptr == MAP_FAILED) {
105 #elif HAVE_MAPVIEWOFFILE 107 HANDLE
mh, fh = (HANDLE)_get_osfhandle(fd);
109 mh = CreateFileMapping(fh,
NULL, PAGE_READONLY, 0, 0,
NULL);
117 ptr = MapViewOfFile(mh, FILE_MAP_READ, 0, 0, *size);
136 read(fd, *bufptr, *size);
146 if (!size || !bufptr)
149 munmap(bufptr, size);
150 #elif HAVE_MAPVIEWOFFILE 151 UnmapViewOfFile(bufptr);
#define LIBAVUTIL_VERSION_INT
Memory handling functions.
const char * av_default_item_name(void *ptr)
Return the context name.
int avpriv_tempfile(const char *prefix, char **filename, int log_offset, void *log_ctx)
Wrapper to work around the lack of mkstemp() on mingw.
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
int avpriv_open(const char *filename, int flags,...)
A wrapper for open() setting O_CLOEXEC.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
void av_file_unmap(uint8_t *bufptr, size_t size)
Unmap or free the buffer bufptr created by av_file_map().
int av_file_map(const char *filename, uint8_t **bufptr, size_t *size, int log_offset, void *log_ctx)
Read the file with name filename, and put its content in a newly allocated buffer or map it with mmap...
common internal API header
int av_tempfile(const char *prefix, char **filename, int log_offset, void *log_ctx)
Wrapper to work around the lack of mkstemp() on mingw.
Describe the class of an AVClass context structure.
int av_strerror(int errnum, char *errbuf, size_t errbuf_size)
Put a description of the AVERROR code errnum in errbuf.
static const AVClass file_log_ctx_class
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