libavformat/url.h File Reference

unbuffered private I/O API More...

#include "avio.h"
#include "libavformat/version.h"
#include "libavutil/dict.h"
#include "libavutil/log.h"

Go to the source code of this file.

Functions

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_connect (URLContext *uc, AVDictionary **options)

Connect an URLContext that has been allocated by ffurl_alloc.

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.

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.

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.

int ffurl_register_protocol (URLProtocol *protocol, int size)

Register the URLProtocol protocol.

int ff_check_interrupt (AVIOInterruptCB *cb)

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

URLProtocol * ffurl_protocol_next (URLProtocol *prev)

Iterate over all available protocols.

int ff_udp_set_remote_url (URLContext *h, const char *uri)

If no filename is given to av_open_input_file because you want to get the local port first, then you must call this function to set the remote server address.

int ff_udp_get_local_port (URLContext *h)

Return the local port used by the UDP connection.

Detailed Description

unbuffered private I/O API

Definition in file url.h.

Function Documentation

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 ff_udp_get_local_port ( URLContext * h )

Return the local port used by the UDP connection.

Parameters:

h

media file context

Returns:: the local port number

Definition at line 307 of file udp.c.

Referenced by ff_rtp_get_local_rtcp_port(), ff_rtp_get_local_rtp_port(), and rtp_open().

int ff_udp_set_remote_url	(	URLContext *	h,
		const char *	uri
	)

If no filename is given to av_open_input_file because you want to get the local port first, then you must call this function to set the remote server address.

url syntax: udp://host:port[?option=val...] option: 'ttl=n' : set the ttl value (for multicast only) 'localport=n' : set the local port 'pkt_size=n' : set max packet size 'reuse=1' : enable reusing the socket

Parameters:

	h	media file context
	uri	of the remote server

Returns:: zero if no error.

Definition at line 268 of file udp.c.

Referenced by ff_rtp_set_remote_url(), and udp_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().


Functions
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_connect (URLContext uc, AVDictionary *options)
	Connect an URLContext that has been allocated by ffurl_alloc.
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.
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.
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.
int	ffurl_register_protocol (URLProtocol *protocol, int size)
	Register the URLProtocol protocol.
int	ff_check_interrupt (AVIOInterruptCB *cb)
	Check if the user has requested to interrup a blocking function associated with cb.
URLProtocol *	ffurl_protocol_next (URLProtocol *prev)
	Iterate over all available protocols.
int	ff_udp_set_remote_url (URLContext h, const char uri)
	If no filename is given to av_open_input_file because you want to get the local port first, then you must call this function to set the remote server address.
int	ff_udp_get_local_port (URLContext *h)
	Return the local port used by the UDP connection.