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0c5f839693
This was added in 9b07a2dc02 as an ABI hack to allow older
code built with lavf 52 to register protocols even if the size
of the URLProtocol struct was increased. Later, registering
protocols from outside of lavf was removed and this workaround
isn't needed any longer since lavf 53.
This removes an unchecked malloc and a memory leak for the cases
when this workaround actually was used - which it hasn't since
lavf 53.
Signed-off-by: Martin Storsjö <martin@martin.st>
285 lines
10 KiB
C
285 lines
10 KiB
C
/*
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* unbuffered private I/O API
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*/
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#ifndef AVFORMAT_URL_H
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#define AVFORMAT_URL_H
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#include "avio.h"
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#include "libavformat/version.h"
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#include "libavutil/dict.h"
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#include "libavutil/log.h"
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#define URL_PROTOCOL_FLAG_NESTED_SCHEME 1 /*< The protocol name can be the first part of a nested protocol scheme */
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#define URL_PROTOCOL_FLAG_NETWORK 2 /*< The protocol uses network */
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extern int (*url_interrupt_cb)(void);
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extern const AVClass ffurl_context_class;
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typedef struct URLContext {
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const AVClass *av_class; /**< information for av_log(). Set by url_open(). */
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struct URLProtocol *prot;
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void *priv_data;
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char *filename; /**< specified URL */
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int flags;
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int max_packet_size; /**< if non zero, the stream is packetized with this max packet size */
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int is_streamed; /**< true if streamed (no seek possible), default = false */
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int is_connected;
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AVIOInterruptCB interrupt_callback;
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} URLContext;
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typedef struct URLProtocol {
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const char *name;
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int (*url_open)( URLContext *h, const char *url, int flags);
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/**
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* This callback is to be used by protocols which open further nested
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* protocols. options are then to be passed to ffurl_open()/ffurl_connect()
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* for those nested protocols.
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*/
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int (*url_open2)(URLContext *h, const char *url, int flags, AVDictionary **options);
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/**
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* Read data from the protocol.
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* If data is immediately available (even less than size), EOF is
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* reached or an error occurs (including EINTR), return immediately.
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* Otherwise:
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* In non-blocking mode, return AVERROR(EAGAIN) immediately.
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* In blocking mode, wait for data/EOF/error with a short timeout (0.1s),
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* and return AVERROR(EAGAIN) on timeout.
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* Checking interrupt_callback, looping on EINTR and EAGAIN and until
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* enough data has been read is left to the calling function; see
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* retry_transfer_wrapper in avio.c.
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*/
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int (*url_read)( URLContext *h, unsigned char *buf, int size);
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int (*url_write)(URLContext *h, const unsigned char *buf, int size);
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int64_t (*url_seek)( URLContext *h, int64_t pos, int whence);
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int (*url_close)(URLContext *h);
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struct URLProtocol *next;
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int (*url_read_pause)(URLContext *h, int pause);
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int64_t (*url_read_seek)(URLContext *h, int stream_index,
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int64_t timestamp, int flags);
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int (*url_get_file_handle)(URLContext *h);
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int (*url_get_multi_file_handle)(URLContext *h, int **handles,
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int *numhandles);
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int (*url_shutdown)(URLContext *h, int flags);
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int priv_data_size;
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const AVClass *priv_data_class;
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int flags;
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int (*url_check)(URLContext *h, int mask);
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} URLProtocol;
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/**
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* Create a URLContext for accessing to the resource indicated by
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* url, but do not initiate the connection yet.
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*
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* @param puc pointer to the location where, in case of success, the
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* function puts the pointer to the created URLContext
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* @param flags flags which control how the resource indicated by url
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* is to be opened
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* @param int_cb interrupt callback to use for the URLContext, may be
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* NULL
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* @return 0 in case of success, a negative value corresponding to an
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* AVERROR code in case of failure
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*/
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int ffurl_alloc(URLContext **puc, const char *filename, int flags,
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const AVIOInterruptCB *int_cb);
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/**
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* Connect an URLContext that has been allocated by ffurl_alloc
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*
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* @param options A dictionary filled with options for nested protocols,
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* i.e. it will be passed to url_open2() for protocols implementing it.
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* This parameter will be destroyed and replaced with a dict containing options
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* that were not found. May be NULL.
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*/
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int ffurl_connect(URLContext *uc, AVDictionary **options);
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/**
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* Create an URLContext for accessing to the resource indicated by
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* url, and open it.
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*
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* @param puc pointer to the location where, in case of success, the
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* function puts the pointer to the created URLContext
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* @param flags flags which control how the resource indicated by url
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* is to be opened
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* @param int_cb interrupt callback to use for the URLContext, may be
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* NULL
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* @param options A dictionary filled with protocol-private options. On return
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* this parameter will be destroyed and replaced with a dict containing options
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* that were not found. May be NULL.
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* @return 0 in case of success, a negative value corresponding to an
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* AVERROR code in case of failure
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*/
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int ffurl_open(URLContext **puc, const char *filename, int flags,
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const AVIOInterruptCB *int_cb, AVDictionary **options);
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/**
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* Read up to size bytes from the resource accessed by h, and store
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* the read bytes in buf.
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*
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* @return The number of bytes actually read, or a negative value
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* corresponding to an AVERROR code in case of error. A value of zero
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* indicates that it is not possible to read more from the accessed
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* resource (except if the value of the size argument is also zero).
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*/
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int ffurl_read(URLContext *h, unsigned char *buf, int size);
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/**
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* Read as many bytes as possible (up to size), calling the
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* read function multiple times if necessary.
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* This makes special short-read handling in applications
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* unnecessary, if the return value is < size then it is
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* certain there was either an error or the end of file was reached.
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*/
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int ffurl_read_complete(URLContext *h, unsigned char *buf, int size);
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/**
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* Write size bytes from buf to the resource accessed by h.
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*
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* @return the number of bytes actually written, or a negative value
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* corresponding to an AVERROR code in case of failure
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*/
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int ffurl_write(URLContext *h, const unsigned char *buf, int size);
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/**
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* Change the position that will be used by the next read/write
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* operation on the resource accessed by h.
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*
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* @param pos specifies the new position to set
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* @param whence specifies how pos should be interpreted, it must be
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* one of SEEK_SET (seek from the beginning), SEEK_CUR (seek from the
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* current position), SEEK_END (seek from the end), or AVSEEK_SIZE
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* (return the filesize of the requested resource, pos is ignored).
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* @return a negative value corresponding to an AVERROR code in case
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* of failure, or the resulting file position, measured in bytes from
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* the beginning of the file. You can use this feature together with
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* SEEK_CUR to read the current file position.
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*/
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int64_t ffurl_seek(URLContext *h, int64_t pos, int whence);
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/**
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* Close the resource accessed by the URLContext h, and free the
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* memory used by it.
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*
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* @return a negative value if an error condition occurred, 0
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* otherwise
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*/
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int ffurl_close(URLContext *h);
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/**
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* Return the filesize of the resource accessed by h, AVERROR(ENOSYS)
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* if the operation is not supported by h, or another negative value
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* corresponding to an AVERROR error code in case of failure.
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*/
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int64_t ffurl_size(URLContext *h);
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/**
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* Return the file descriptor associated with this URL. For RTP, this
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* will return only the RTP file descriptor, not the RTCP file descriptor.
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*
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* @return the file descriptor associated with this URL, or <0 on error.
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*/
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int ffurl_get_file_handle(URLContext *h);
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/**
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* Return the file descriptors associated with this URL.
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*
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* @return 0 on success or <0 on error.
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*/
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int ffurl_get_multi_file_handle(URLContext *h, int **handles, int *numhandles);
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/**
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* Signal the URLContext that we are done reading or writing the stream.
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*
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* @param h pointer to the resource
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* @param flags flags which control how the resource indicated by url
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* is to be shutdown
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*
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* @return a negative value if an error condition occurred, 0
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* otherwise
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*/
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int ffurl_shutdown(URLContext *h, int flags);
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/**
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* Register the URLProtocol protocol.
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*/
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int ffurl_register_protocol(URLProtocol *protocol);
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/**
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* Check if the user has requested to interrup a blocking function
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* associated with cb.
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*/
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int ff_check_interrupt(AVIOInterruptCB *cb);
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/**
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* Iterate over all available protocols.
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*
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* @param prev result of the previous call to this functions or NULL.
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*/
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URLProtocol *ffurl_protocol_next(URLProtocol *prev);
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/* udp.c */
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int ff_udp_set_remote_url(URLContext *h, const char *uri);
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int ff_udp_get_local_port(URLContext *h);
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/**
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* Assemble a URL string from components. This is the reverse operation
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* of av_url_split.
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*
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* Note, this requires networking to be initialized, so the caller must
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* ensure ff_network_init has been called.
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*
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* @see av_url_split
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*
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* @param str the buffer to fill with the url
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* @param size the size of the str buffer
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* @param proto the protocol identifier, if null, the separator
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* after the identifier is left out, too
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* @param authorization an optional authorization string, may be null.
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* An empty string is treated the same as a null string.
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* @param hostname the host name string
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* @param port the port number, left out from the string if negative
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* @param fmt a generic format string for everything to add after the
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* host/port, may be null
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* @return the number of characters written to the destination buffer
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*/
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int ff_url_join(char *str, int size, const char *proto,
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const char *authorization, const char *hostname,
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int port, const char *fmt, ...) av_printf_format(7, 8);
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/*
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* Convert a relative url into an absolute url, given a base url.
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*
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* @param buf the buffer where output absolute url is written
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* @param size the size of buf
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* @param base the base url, may be equal to buf.
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* @param rel the new url, which is interpreted relative to base
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*/
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void ff_make_absolute_url(char *buf, int size, const char *base,
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const char *rel);
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#endif /* AVFORMAT_URL_H */
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