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d5ec8ba7f2
Define positive return values as non errors and leave further meaning undefined This allows future extensions to use these values Reviewed-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
289 lines
11 KiB
C
289 lines
11 KiB
C
/*
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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int64_t rw_timeout; /**< maximum time to wait for (network) read/write operation completion, in mcs */
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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. Also set the URLContext pointer to NULL.
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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_closep(URLContext **h);
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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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* @param size the size of the URLProtocol struct referenced
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*/
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int ffurl_register_protocol(URLProtocol *protocol, int size);
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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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