Файл file.h

См. исходные тексты.

Функции
av_warn_unused_result int	av_file_map (const char *filename, uint8_t **bufptr, size_t *size, int log_offset, void *log_ctx)
void	av_file_unmap (uint8_t *bufptr, size_t size)
int	av_tempfile (const char *prefix, char **filename, int log_offset, void *log_ctx)

Подробное описание

Misc file utilities.

См. определение в файле file.h

Функции

av_file_map()

av_warn_unused_result 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() when available. In case of success set *bufptr to the read or mmapped buffer, and *size to the size in bytes of the buffer in *bufptr. Unlike mmap this function succeeds with zero sized files, in this case *bufptr will be set to NULL and *size will be set to 0. The returned buffer must be released with av_file_unmap().

Аргументы

log_offset	loglevel offset used for logging
log_ctx	context used for logging

Возвращает

a non negative number in case of success, a negative value corresponding to an AVERROR error code in case of failure

av_file_unmap()

void av_file_unmap	(	uint8_t *	bufptr,
		size_t	size
	)

Unmap or free the buffer bufptr created by av_file_map().

Аргументы

size	size in bytes of bufptr, must be the same as returned by av_file_map()

av_tempfile()

int av_tempfile	(	const char *	prefix,
		char **	filename,
		int	log_offset,
		void *	log_ctx
	)

Wrapper to work around the lack of mkstemp() on mingw. Also, tries to create file in /tmp first, if possible. *prefix can be a character constant; *filename will be allocated internally.

Возвращает

file descriptor of opened file (or negative value corresponding to an AVERROR code on error) and opened file name in **filename.

Заметки

On very old libcs it is necessary to set a secure umask before calling this, av_tempfile() can't call umask itself as it is used in libraries and could interfere with the calling application.

Уст.:

as fd numbers cannot be passed saftely between libs on some platforms