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Data Structures | Macros | Functions | Variables
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.

Data Structures

struct  URLContext
 
struct  URLProtocol
 

Macros

#define URL_PROTOCOL_FLAG_NESTED_SCHEME   1 /*< The protocol name can be the first part of a nested protocol scheme */
 
#define URL_PROTOCOL_FLAG_NETWORK   2 /*< The protocol uses network */
 

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. More...
 
int ffurl_connect (URLContext *uc, AVDictionary **options)
 Connect an URLContext that has been allocated by ffurl_alloc. More...
 
int ffurl_open_whitelist (URLContext **puc, const char *filename, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options, const char *whitelist, const char *blacklist, URLContext *parent)
 Create an URLContext for accessing to the resource indicated by url, and open it. More...
 
int ffurl_open (URLContext **puc, const char *filename, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options)
 
int ffurl_accept (URLContext *s, URLContext **c)
 Accept an URLContext c on an URLContext s. More...
 
int ffurl_handshake (URLContext *c)
 Perform one step of the protocol handshake to accept a new client. More...
 
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. More...
 
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. More...
 
int ffurl_write (URLContext *h, const unsigned char *buf, int size)
 Write size bytes from buf to the resource accessed by h. More...
 
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. More...
 
int ffurl_closep (URLContext **h)
 Close the resource accessed by the URLContext h, and free the memory used by it. More...
 
int ffurl_close (URLContext *h)
 
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. More...
 
int ffurl_get_file_handle (URLContext *h)
 Return the file descriptor associated with this URL. More...
 
int ffurl_get_multi_file_handle (URLContext *h, int **handles, int *numhandles)
 Return the file descriptors associated with this URL. More...
 
int ffurl_shutdown (URLContext *h, int flags)
 Signal the URLContext that we are done reading or writing the stream. More...
 
int ff_check_interrupt (AVIOInterruptCB *cb)
 Check if the user has requested to interrupt a blocking function associated with cb. More...
 
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. More...
 
int ff_udp_get_local_port (URLContext *h)
 Return the local port used by the UDP connection. More...
 
int ff_url_join (char *str, int size, const char *proto, const char *authorization, const char *hostname, int port, const char *fmt,...) av_printf_format(7
 Assemble a URL string from components. More...
 
int void ff_make_absolute_url (char *buf, int size, const char *base, const char *rel)
 Convert a relative url into an absolute url, given a base url. More...
 
AVIODirEntryff_alloc_dir_entry (void)
 Allocate directory entry with default values. More...
 
const AVClassff_urlcontext_child_class_next (const AVClass *prev)
 
const URLProtocol ** ffurl_get_protocols (const char *whitelist, const char *blacklist)
 Construct a list of protocols matching a given whitelist and/or blacklist. More...
 

Variables

const AVClass ffurl_context_class
 

Detailed Description

unbuffered private I/O API

Definition in file url.h.

Macro Definition Documentation

#define URL_PROTOCOL_FLAG_NESTED_SCHEME   1 /*< The protocol name can be the first part of a nested protocol scheme */

Definition at line 33 of file url.h.

Referenced by url_find_protocol().

#define URL_PROTOCOL_FLAG_NETWORK   2 /*< The protocol uses network */

Definition at line 34 of file url.h.

Referenced by ffurl_closep(), and url_alloc_for_protocol().

Function Documentation

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
pucpointer to the location where, in case of success, the function puts the pointer to the created URLContext
flagsflags which control how the resource indicated by url is to be opened
int_cbinterrupt 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 292 of file avio.c.

Referenced by avio_check(), avio_open_dir(), avpriv_io_delete(), avpriv_io_move(), ffurl_open_whitelist(), http_accept(), mmsh_open_internal(), rtmp_http_open(), and tcp_accept().

int ffurl_connect ( URLContext uc,
AVDictionary **  options 
)

Connect an URLContext that has been allocated by ffurl_alloc.

Parameters
optionsA 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 166 of file avio.c.

Referenced by avio_check(), ffurl_open_whitelist(), mmsh_open_internal(), and rtmp_http_open().

int ffurl_open_whitelist ( URLContext **  puc,
const char *  filename,
int  flags,
const AVIOInterruptCB int_cb,
AVDictionary **  options,
const char *  whitelist,
const char *  blacklist,
URLContext parent 
)

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

Parameters
pucpointer to the location where, in case of success, the function puts the pointer to the created URLContext
flagsflags which control how the resource indicated by url is to be opened
int_cbinterrupt callback to use for the URLContext, may be NULL
optionsA 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.
parentAn enclosing URLContext, whose generic options should be applied to this URLContext as well.
Returns
>= 0 in case of success, a negative value corresponding to an AVERROR code in case of failure

Definition at line 309 of file avio.c.

Referenced by async_open(), cache_open(), concat_open(), crypto_open2(), ff_tls_open_underlying(), ffio_open_whitelist(), ffurl_open(), ftp_connect_control_connection(), ftp_connect_data_connection(), gopher_open(), hls_read(), http_listen(), http_open_cnx_internal(), icecast_open(), ism_flush(), ism_seek(), md5_close(), mms_open(), rtmp_calc_swfhash(), rtmp_open(), rtmpe_open(), rtp_open(), rtsp_listen(), rtsp_read_setup(), sap_read_header(), sap_write_header(), srtp_open(), subfile_open(), and tee_open().

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

Definition at line 357 of file avio.c.

Referenced by rtp_new_av_stream().

int ffurl_accept ( URLContext s,
URLContext **  c 
)

Accept an URLContext c on an URLContext s.

Parameters
sserver context
cclient context, must be unallocated.
Returns
>= 0 on success, ff_neterrno() on failure.

Definition at line 226 of file avio.c.

Referenced by avio_accept(), and http_accept().

int ffurl_handshake ( URLContext c)

Perform one step of the protocol handshake to accept a new client.

See avio_handshake() for details. Implementations should try to return decreasing values. If the protocol uses an underlying protocol, the underlying handshake is usually the first step, and the return value can be: (largest value for this protocol) + (return value from other protocol)

Parameters
cthe client context
Returns
>= 0 on success or a negative value corresponding to an AVERROR code on failure

Definition at line 234 of file avio.c.

Referenced by avio_handshake(), and http_handshake().

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 407 of file avio.c.

Referenced by cache_read(), concat_read(), crypto_read(), ff_rtmp_packet_read(), ff_rtmp_packet_read_internal(), ftp_getc(), ftp_read(), ftp_read_dir(), gnutls_url_pull(), gopher_read(), hls_read(), http_buf_read(), http_getc(), io_read_packet(), rtmp_http_open(), rtmp_http_read(), rtmp_http_send_cmd(), rtmp_write(), rtmpe_read(), sap_fetch_packet(), sap_read_header(), srtp_read(), subfile_read(), tls_client_handshake_loop(), tls_read(), url_bio_bread(), and wrapped_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 414 of file avio.c.

Referenced by ff_rtsp_tcp_read_packet(), get_chunk_header(), get_http_header_data(), get_tcp_server_response(), read_data_packet(), read_line(), rtmp_calc_swfhash(), rtmp_handshake(), rtmp_packet_read_one_chunk(), rtmp_receive_hs_packet(), rtmp_server_handshake(), rtsp_read_announce(), and tls_read_cb().

int ffurl_write ( URLContext h,
const unsigned char *  buf,
int  size 
)
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
posspecifies the new position to set
whencespecifies 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 434 of file avio.c.

Referenced by async_buffer_task(), cache_read(), cache_seek(), concat_read(), concat_seek(), ffurl_connect(), ffurl_size(), io_seek(), ism_seek(), rtmp_calc_swfhash(), and slave_seek().

int ffurl_closep ( URLContext **  h)

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

Also set the URLContext pointer to NULL.

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

Definition at line 444 of file avio.c.

Referenced by ffurl_close(), ftp_abort(), ftp_close_both_connections(), ftp_close_data_connection(), ftp_close_dir(), ftp_open_dir(), http_close(), http_open_cnx(), mmsh_close(), and tee_close().

int ffurl_close ( URLContext h)
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 611 of file avio.c.

Referenced by async_open(), and concat_open().

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 626 of file avio.c.

Referenced by ftp_get_file_handle(), http_get_file_handle(), rtp_open(), rtsp_write_packet(), sap_fetch_packet(), sap_write_header(), and srtp_get_file_handle().

int ffurl_get_multi_file_handle ( URLContext h,
int **  handles,
int *  numhandles 
)

Return the file descriptors associated with this URL.

Returns
0 on success or <0 on error.

Definition at line 633 of file avio.c.

Referenced by srtp_get_multi_file_handle().

int ffurl_shutdown ( URLContext h,
int  flags 
)

Signal the URLContext that we are done reading or writing the stream.

Parameters
hpointer to the resource
flagsflags which control how the resource indicated by url is to be shutdown
Returns
a negative value if an error condition occurred, 0 otherwise

Definition at line 648 of file avio.c.

Referenced by ftp_shutdown().

int ff_check_interrupt ( AVIOInterruptCB cb)

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

Definition at line 655 of file avio.c.

Referenced by async_check_interrupt(), avformat_find_stream_info(), failing_write_packet(), ff_listen_connect(), ff_network_wait_fd_timeout(), ff_poll_interrupt(), hls_read(), read_data(), retry_transfer_wrapper(), and rtp_read().

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 'overrun_nonfatal=1': survive in case of circular buffer overrun

Parameters
hmedia file context
uriof the remote server
Returns
zero if no error.

Definition at line 438 of file udp.c.

Referenced by ff_rtp_set_remote_url(), and udp_open().

int ff_udp_get_local_port ( URLContext h)

Return the local port used by the UDP connection.

Parameters
hmedia file context
Returns
the local port number

Definition at line 477 of file udp.c.

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

int ff_url_join ( char *  str,
int  size,
const char *  proto,
const char *  authorization,
const char *  hostname,
int  port,
const char *  fmt,
  ... 
)

Assemble a URL string from components.

This is the reverse operation of av_url_split.

Note, this requires networking to be initialized, so the caller must ensure ff_network_init has been called.

See Also
av_url_split
Parameters
strthe buffer to fill with the url
sizethe size of the str buffer
protothe protocol identifier, if null, the separator after the identifier is left out, too
authorizationan optional authorization string, may be null. An empty string is treated the same as a null string.
hostnamethe host name string
portthe port number, left out from the string if negative
fmta generic format string for everything to add after the host/port, may be null
Returns
the number of characters written to the destination buffer
int void ff_make_absolute_url ( char *  buf,
int  size,
const char *  base,
const char *  rel 
)

Convert a relative url into an absolute url, given a base url.

Parameters
bufthe buffer where output absolute url is written
sizethe size of buf
basethe base url, may be equal to buf.
relthe new url, which is interpreted relative to base

Definition at line 80 of file url.c.

Referenced by add_file(), new_init_section(), new_playlist(), parse_location(), parse_playlist(), and test().

AVIODirEntry* ff_alloc_dir_entry ( void  )

Allocate directory entry with default values.

Returns
entry or NULL on error

Definition at line 149 of file url.c.

Referenced by ftp_read_dir(), libsmbc_read_dir(), and libssh_read_dir().

const AVClass* ff_urlcontext_child_class_next ( const AVClass prev)

Definition at line 75 of file protocols.c.

const URLProtocol** ffurl_get_protocols ( const char *  whitelist,
const char *  blacklist 
)

Construct a list of protocols matching a given whitelist and/or blacklist.

Parameters
whitelista comma-separated list of allowed protocol names or NULL. If this is a non-empty string, only protocols in this list will be included.
blacklista comma-separated list of forbidden protocol names or NULL. If this is a non-empty string, all protocols in this list will be excluded.
Returns
a NULL-terminated array of matching protocols. The array must be freed by the caller.

Definition at line 110 of file protocols.c.

Referenced by url_find_protocol().

Variable Documentation

const AVClass ffurl_context_class

Definition at line 63 of file avio.c.

Referenced by ff_avio_child_class_next(), and url_alloc_for_protocol().