libavformat/avio.c File Reference

#include <unistd.h>
#include "libavutil/avstring.h"
#include "libavutil/dict.h"
#include "libavutil/opt.h"
#include "os_support.h"
#include "avformat.h"
#include "url.h"

Go to the source code of this file.

Defines

#define URL_SCHEME_CHARS

Functions

URLProtocol * ffurl_protocol_next (URLProtocol *prev)

Iterate over all available protocols.

static int default_interrupt_cb (void)

URLProtocol * av_protocol_next (URLProtocol *p)

returns the next registered protocol after the given protocol (the first if NULL is given), or NULL if protocol is the last one.

const char * avio_enum_protocols (void **opaque, int output)

Iterate through names of available protocols.

int ffurl_register_protocol (URLProtocol *protocol, int size)

Register the URLProtocol protocol.

static int url_alloc_for_protocol (URLContext **puc, struct URLProtocol *up, const char *filename, int flags, const AVIOInterruptCB *int_cb)

int ffurl_connect (URLContext *uc, AVDictionary **options)

Connect an URLContext that has been allocated by ffurl_alloc.

int url_open_protocol (URLContext **puc, struct URLProtocol *up, const char *filename, int flags)

int url_alloc (URLContext **puc, const char *filename, int flags)

int url_connect (URLContext *uc)

int url_open (URLContext **puc, const char *filename, int flags)

int url_read (URLContext *h, unsigned char *buf, int size)

int url_read_complete (URLContext *h, unsigned char *buf, int size)

int url_write (URLContext *h, const unsigned char *buf, int size)

int64_t url_seek (URLContext *h, int64_t pos, int whence)

int url_close (URLContext *h)

int64_t url_filesize (URLContext *h)

int url_get_file_handle (URLContext *h)

int url_get_max_packet_size (URLContext *h)

void url_get_filename (URLContext *h, char *buf, int buf_size)

void url_set_interrupt_cb (URLInterruptCB *interrupt_cb)

int av_register_protocol2 (URLProtocol *protocol, int size)

Register the URLProtocol protocol.

int ffurl_alloc (URLContext **puc, const char *filename, int flags, const AVIOInterruptCB *int_cb)

Create a URLContext for accessing to the resource indicated by url, but do not initiate the connection yet.

int ffurl_open (URLContext **puc, const char *filename, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options)

Create an URLContext for accessing to the resource indicated by url, and open it.

static int retry_transfer_wrapper (URLContext *h, unsigned char *buf, int size, int size_min, int(*transfer_func)(URLContext *h, unsigned char *buf, int size))

int ffurl_read (URLContext *h, unsigned char *buf, int size)

Read up to size bytes from the resource accessed by h, and store the read bytes in buf.

int ffurl_read_complete (URLContext *h, unsigned char *buf, int size)

Read as many bytes as possible (up to size), calling the read function multiple times if necessary.

int ffurl_write (URLContext *h, const unsigned char *buf, int size)

Write size bytes from buf to the resource accessed by h.

int64_t ffurl_seek (URLContext *h, int64_t pos, int whence)

Change the position that will be used by the next read/write operation on the resource accessed by h.

int ffurl_close (URLContext *h)

Close the resource accessed by the URLContext h, and free the memory used by it.

int url_exist (const char *filename)

Return a non-zero value if the resource indicated by url exists, 0 otherwise.

int avio_check (const char *url, int flags)

Return AVIO_FLAG_* access flags corresponding to the access permissions of the resource in url, or a negative value corresponding to an AVERROR code in case of failure.

int64_t ffurl_size (URLContext *h)

Return the filesize of the resource accessed by h, AVERROR(ENOSYS) if the operation is not supported by h, or another negative value corresponding to an AVERROR error code in case of failure.

int ffurl_get_file_handle (URLContext *h)

Return the file descriptor associated with this URL.

void avio_set_interrupt_cb (int(*interrupt_cb)(void))

The callback is called in blocking functions to test regulary if asynchronous interruption is needed.

int ff_check_interrupt (AVIOInterruptCB *cb)

Check if the user has requested to interrup a blocking function associated with cb.

int av_url_read_pause (URLContext *h, int pause)

int64_t av_url_read_seek (URLContext *h, int stream_index, int64_t timestamp, int flags)

Variables

static URLProtocol * first_protocol = NULL

int(* url_interrupt_cb )(void) = default_interrupt_cb

Logging context.

static const AVOption options [] = {{NULL}}

const AVClass ffurl_context_class

static const char * urlcontext_to_name (void *ptr)

static void * urlcontext_child_next (void *obj, void *prev)

static const AVClass * urlcontext_child_class_next (const AVClass *prev)

Define Documentation

#define URL_SCHEME_CHARS

Value:

"abcdefghijklmnopqrstuvwxyz"                \
    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"                \
    "0123456789+-."

Definition at line 283 of file avio.c.

Referenced by ffurl_alloc().

Function Documentation

int avio_check	(	const char *	url,
		int	flags
	)

Return AVIO_FLAG_* access flags corresponding to the access permissions of the resource in url, or a negative value corresponding to an AVERROR code in case of failure.

The returned access flags are masked by the value in flags.

Note:: This function is intrinsically unsafe, in the sense that the checked resource may change its existence or permission status from one call to another. Thus you should not trust the returned value, unless you are sure that no other processes are accessing the checked resource.

Definition at line 436 of file avio.c.

Referenced by assert_file_overwrite(), build_feed_streams(), and find_image_range().

const char* avio_enum_protocols	(	void **	opaque,
		int	output
	)

Iterate through names of available protocols.

Note:: it is recommanded to use av_protocol_next() instead of this

Parameters:

	opaque	A private pointer representing current protocol. It must be a pointer to NULL on first iteration and will be updated by successive calls to avio_enum_protocols.
	output	If set to 1, iterate over output protocols, otherwise over input protocols.

Returns:: A static string containing the name of current protocol or NULL

Definition at line 97 of file avio.c.

Referenced by avio_enum_protocols().

void avio_set_interrupt_cb ( int(*)(void) interrupt_cb )

The callback is called in blocking functions to test regulary if asynchronous interruption is needed.

AVERROR_EXIT is returned in this case by the interrupted function. 'NULL' means no interrupt callback is given.

Deprecated:: Use interrupt_callback in AVFormatContext/avio_open2 instead.

Definition at line 483 of file avio.c.

Referenced by url_set_interrupt_cb().

static int default_interrupt_cb ( void ) [static]

Definition at line 478 of file avio.c.

Referenced by avio_set_interrupt_cb().

int ff_check_interrupt ( AVIOInterruptCB * cb )

Check if the user has requested to interrup a blocking function associated with cb.

Definition at line 491 of file avio.c.

Referenced by applehttp_read(), avformat_find_stream_info(), do_tls_poll(), read_data(), retry_transfer_wrapper(), rtp_read(), and tcp_open().

int ffurl_alloc	(	URLContext **	puc,
		const char *	filename,
		int	flags,
		const AVIOInterruptCB *	int_cb
	)

Create a URLContext for accessing to the resource indicated by url, but do not initiate the connection yet.

Parameters:

	puc	pointer to the location where, in case of success, the function puts the pointer to the created URLContext
	flags	flags which control how the resource indicated by url is to be opened
	int_cb	interrupt callback to use for the URLContext, may be NULL

Returns:: 0 in case of success, a negative value corresponding to an AVERROR code in case of failure

Definition at line 288 of file avio.c.

Referenced by avio_check(), ffurl_open(), mmsh_open_internal(), open_input(), and url_alloc().

int ffurl_close ( URLContext * h )

Close the resource accessed by the URLContext h, and free the memory used by it.

Returns:: a negative value if an error condition occurred, 0 otherwise

Definition at line 405 of file avio.c.

Referenced by applehttp_close(), applehttp_read(), applehttp_read_seek(), avio_check(), avio_close(), avio_open2(), cache_close(), close_connection(), concat_close(), concat_open(), crypto_close(), ff_rtsp_undo_setup(), ffurl_open(), free_variant_list(), gopher_close(), http_close(), http_open_cnx(), http_seek(), md5_close(), mms_close(), mmsh_close(), mmsh_open_internal(), mmsh_read_seek(), open_input(), read_data(), recheck_discard_flags(), rtmp_close(), rtp_close(), rtp_new_av_stream(), rtp_open(), sap_read_close(), sap_write_close(), tls_close(), tls_open(), url_close(), url_exist(), and url_open_protocol().

int ffurl_connect	(	URLContext *	uc,
		AVDictionary **	options
	)

Connect an URLContext that has been allocated by ffurl_alloc.

Parameters:

options

A dictionary filled with options for nested protocols, i.e. it will be passed to url_open2() for protocols implementing it. This parameter will be destroyed and replaced with a dict containing options that were not found. May be NULL.

Definition at line 190 of file avio.c.

Referenced by avio_check(), ffurl_open(), mmsh_open_internal(), open_input(), url_connect(), and url_open_protocol().

int ffurl_get_file_handle ( URLContext * h )

Return the file descriptor associated with this URL.

For RTP, this will return only the RTP file descriptor, not the RTCP file descriptor.

Returns:: the file descriptor associated with this URL, or <0 on error.

Definition at line 470 of file avio.c.

Referenced by http_get_file_handle(), rtp_open(), rtsp_write_packet(), sap_fetch_packet(), sap_write_header(), tls_open(), and url_get_file_handle().

int ffurl_open	(	URLContext **	puc,
		const char *	filename,
		int	flags,
		const AVIOInterruptCB *	int_cb,
		AVDictionary **	options
	)

Create an URLContext for accessing to the resource indicated by url, and open it.

Parameters:

	puc	pointer to the location where, in case of success, the function puts the pointer to the created URLContext
	flags	flags which control how the resource indicated by url is to be opened
	int_cb	interrupt callback to use for the URLContext, may be NULL
	options	A dictionary filled with protocol-private options. On return this parameter will be destroyed and replaced with a dict containing options that were not found. May be NULL.

Returns:: 0 in case of success, a negative value corresponding to an AVERROR code in case of failure

Definition at line 322 of file avio.c.

Referenced by applehttp_read(), avio_open2(), cache_open(), concat_open(), crypto_open(), gopher_open(), http_open_cnx(), md5_close(), mms_open(), open_input(), rtmp_open(), rtp_new_av_stream(), rtp_open(), sap_read_header(), sap_write_header(), tls_open(), url_exist(), and url_open().

URLProtocol* ffurl_protocol_next ( URLProtocol * prev )

Iterate over all available protocols.

Parameters:

prev

result of the previous call to this functions or NULL.

Definition at line 36 of file avio.c.

Referenced by av_protocol_next(), avio_enum_protocols(), ffurl_alloc(), and urlcontext_child_class_next().

int ffurl_read	(	URLContext *	h,
		unsigned char *	buf,
		int	size
	)

Read up to size bytes from the resource accessed by h, and store the read bytes in buf.

Returns:: The number of bytes actually read, or a negative value corresponding to an AVERROR code in case of error. A value of zero indicates that it is not possible to read more from the accessed resource (except if the value of the size argument is also zero).

Definition at line 370 of file avio.c.

Referenced by applehttp_read(), cache_read(), concat_read(), crypto_read(), ff_rtmp_packet_read(), ffio_fdopen(), gopher_read(), http_buf_read(), http_getc(), read_data(), sap_fetch_packet(), sap_read_header(), and url_read().

int ffurl_read_complete	(	URLContext *	h,
		unsigned char *	buf,
		int	size
	)

Read as many bytes as possible (up to size), calling the read function multiple times if necessary.

This makes special short-read handling in applications unnecessary, if the return value is < size then it is certain there was either an error or the end of file was reached.

Definition at line 377 of file avio.c.

Referenced by ff_rtmp_packet_read(), ff_rtsp_tcp_read_packet(), get_chunk_header(), get_http_header_data(), get_tcp_server_response(), open_input(), read_data_packet(), rtmp_handshake(), and url_read_complete().

int ffurl_register_protocol	(	URLProtocol *	protocol,
		int	size
	)

Register the URLProtocol protocol.

Parameters:

size

the size of the URLProtocol struct referenced

Definition at line 107 of file avio.c.

Referenced by av_register_protocol2().

int64_t ffurl_seek	(	URLContext *	h,
		int64_t	pos,
		int	whence
	)

Change the position that will be used by the next read/write operation on the resource accessed by h.

Parameters:

	pos	specifies the new position to set
	whence	specifies how pos should be interpreted, it must be one of SEEK_SET (seek from the beginning), SEEK_CUR (seek from the current position), SEEK_END (seek from the end), or AVSEEK_SIZE (return the filesize of the requested resource, pos is ignored).

Returns:: a negative value corresponding to an AVERROR code in case of failure, or the resulting file position, measured in bytes from the beginning of the file. You can use this feature together with SEEK_CUR to read the current file position.

Definition at line 395 of file avio.c.

Referenced by cache_seek(), concat_read(), concat_seek(), ffio_fdopen(), ffurl_connect(), ffurl_size(), and url_seek().

int64_t ffurl_size ( URLContext * h )

Return the filesize of the resource accessed by h, AVERROR(ENOSYS) if the operation is not supported by h, or another negative value corresponding to an AVERROR error code in case of failure.

Definition at line 455 of file avio.c.

Referenced by concat_open(), and url_filesize().

int ffurl_write	(	URLContext *	h,
		const unsigned char *	buf,
		int	size
	)

Write size bytes from buf to the resource accessed by h.

Returns:: the number of bytes actually written, or a negative value corresponding to an AVERROR code in case of failure

Definition at line 384 of file avio.c.

Referenced by ff_rtmp_packet_write(), ff_rtp_check_and_send_back_rr(), ff_rtp_send_punch_packets(), ffio_fdopen(), gopher_write(), http_close(), http_connect(), http_send_data(), http_write(), md5_close(), rtmp_handshake(), rtp_write(), sap_write_close(), sap_write_packet(), send_command_packet(), tcp_write_packet(), and url_write().

static int retry_transfer_wrapper	(	URLContext *	h,
		unsigned char *	buf,
		int	size,
		int	size_min,
		int()(URLContext h, unsigned char *buf, int size)	transfer_func
	)			`[inline, static]`

Definition at line 340 of file avio.c.

Referenced by ffurl_read(), ffurl_read_complete(), and ffurl_write().

static int url_alloc_for_protocol	(	URLContext **	puc,
		struct URLProtocol *	up,
		const char *	filename,
		int	flags,
		const AVIOInterruptCB *	int_cb
	)			`[static]`

Definition at line 122 of file avio.c.

Referenced by ffurl_alloc(), and url_open_protocol().

int url_exist ( const char * url )

Return a non-zero value if the resource indicated by url exists, 0 otherwise.

Deprecated:: Use avio_check instead.

Definition at line 426 of file avio.c.

void url_set_interrupt_cb ( URLInterruptCB * interrupt_cb )

Definition at line 273 of file avio.c.

static const AVClass* urlcontext_child_class_next ( const AVClass * prev ) [static]

Definition at line 58 of file avio.c.

static void* urlcontext_child_next	(	void *	obj,
		void *	prev
	)			`[static]`

Definition at line 50 of file avio.c.

static const char* urlcontext_to_name ( void * ptr ) [static]

Definition at line 43 of file avio.c.

Variable Documentation

const AVClass ffurl_context_class

Initial value:

 {
    .class_name     = "URLContext",
    .item_name      = urlcontext_to_name,
    .option         = options,
    .version        = LIBAVUTIL_VERSION_INT,
    .child_next     = urlcontext_child_next,
    .child_class_next = urlcontext_child_class_next,
}

Definition at line 76 of file avio.c.

URLProtocol* first_protocol = NULL [static]

Definition at line 34 of file avio.c.

const AVOption options[] = {{NULL}} [static]

Definition at line 75 of file avio.c.

int(* url_interrupt_cb)(void) = default_interrupt_cb

Referenced by avio_set_interrupt_cb(), and ff_check_interrupt().


Defines
#define	URL_SCHEME_CHARS
Functions
URLProtocol *	ffurl_protocol_next (URLProtocol *prev)
	Iterate over all available protocols.
static int	default_interrupt_cb (void)
URLProtocol *	av_protocol_next (URLProtocol *p)
	returns the next registered protocol after the given protocol (the first if NULL is given), or NULL if protocol is the last one.
const char *	avio_enum_protocols (void **opaque, int output)
	Iterate through names of available protocols.
int	ffurl_register_protocol (URLProtocol *protocol, int size)
	Register the URLProtocol protocol.
static int	url_alloc_for_protocol (URLContext *puc, struct URLProtocol up, const char filename, int flags, const AVIOInterruptCB int_cb)
int	ffurl_connect (URLContext uc, AVDictionary *options)
	Connect an URLContext that has been allocated by ffurl_alloc.
int	url_open_protocol (URLContext *puc, struct URLProtocol up, const char *filename, int flags)
int	url_alloc (URLContext *puc, const char filename, int flags)
int	url_connect (URLContext *uc)
int	url_open (URLContext *puc, const char filename, int flags)
int	url_read (URLContext h, unsigned char buf, int size)
int	url_read_complete (URLContext h, unsigned char buf, int size)
int	url_write (URLContext h, const unsigned char buf, int size)
int64_t	url_seek (URLContext *h, int64_t pos, int whence)
int	url_close (URLContext *h)
int64_t	url_filesize (URLContext *h)
int	url_get_file_handle (URLContext *h)
int	url_get_max_packet_size (URLContext *h)
void	url_get_filename (URLContext h, char buf, int buf_size)
void	url_set_interrupt_cb (URLInterruptCB *interrupt_cb)
int	av_register_protocol2 (URLProtocol *protocol, int size)
	Register the URLProtocol protocol.
int	ffurl_alloc (URLContext *puc, const char filename, int flags, const AVIOInterruptCB *int_cb)
	Create a URLContext for accessing to the resource indicated by url, but do not initiate the connection yet.
int	ffurl_open (URLContext *puc, const char filename, int flags, const AVIOInterruptCB int_cb, AVDictionary *options)
	Create an URLContext for accessing to the resource indicated by url, and open it.
static int	retry_transfer_wrapper (URLContext h, unsigned char buf, int size, int size_min, int(transfer_func)(URLContext h, unsigned char *buf, int size))
int	ffurl_read (URLContext h, unsigned char buf, int size)
	Read up to size bytes from the resource accessed by h, and store the read bytes in buf.
int	ffurl_read_complete (URLContext h, unsigned char buf, int size)
	Read as many bytes as possible (up to size), calling the read function multiple times if necessary.
int	ffurl_write (URLContext h, const unsigned char buf, int size)
	Write size bytes from buf to the resource accessed by h.
int64_t	ffurl_seek (URLContext *h, int64_t pos, int whence)
	Change the position that will be used by the next read/write operation on the resource accessed by h.
int	ffurl_close (URLContext *h)
	Close the resource accessed by the URLContext h, and free the memory used by it.
int	url_exist (const char *filename)
	Return a non-zero value if the resource indicated by url exists, 0 otherwise.
int	avio_check (const char *url, int flags)
	Return AVIO_FLAG_* access flags corresponding to the access permissions of the resource in url, or a negative value corresponding to an AVERROR code in case of failure.
int64_t	ffurl_size (URLContext *h)
	Return the filesize of the resource accessed by h, AVERROR(ENOSYS) if the operation is not supported by h, or another negative value corresponding to an AVERROR error code in case of failure.
int	ffurl_get_file_handle (URLContext *h)
	Return the file descriptor associated with this URL.
void	avio_set_interrupt_cb (int(*interrupt_cb)(void))
	The callback is called in blocking functions to test regulary if asynchronous interruption is needed.
int	ff_check_interrupt (AVIOInterruptCB *cb)
	Check if the user has requested to interrup a blocking function associated with cb.
int	av_url_read_pause (URLContext *h, int pause)
int64_t	av_url_read_seek (URLContext *h, int stream_index, int64_t timestamp, int flags)
Variables
static URLProtocol *	first_protocol = NULL
int(*	url_interrupt_cb )(void) = default_interrupt_cb
Logging context.
static const AVOption	options [] = {{NULL}}
const AVClass	ffurl_context_class
static const char *	urlcontext_to_name (void *ptr)
static void *	urlcontext_child_next (void obj, void prev)
static const AVClass *	urlcontext_child_class_next (const AVClass *prev)