mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-11-30 22:50:48 +00:00
283 lines
10 KiB
C
283 lines
10 KiB
C
/*
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* Libav is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* unbuffered private I/O API
|
|
*/
|
|
|
|
#ifndef AVFORMAT_URL_H
|
|
#define AVFORMAT_URL_H
|
|
|
|
#include "avio.h"
|
|
#include "libavformat/version.h"
|
|
|
|
#include "libavutil/dict.h"
|
|
#include "libavutil/log.h"
|
|
|
|
#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 */
|
|
|
|
extern const AVClass ffurl_context_class;
|
|
|
|
typedef struct URLContext {
|
|
const AVClass *av_class; /**< information for av_log(). Set by url_open(). */
|
|
struct URLProtocol *prot;
|
|
void *priv_data;
|
|
char *filename; /**< specified URL */
|
|
int flags;
|
|
int max_packet_size; /**< if non zero, the stream is packetized with this max packet size */
|
|
int is_streamed; /**< true if streamed (no seek possible), default = false */
|
|
int is_connected;
|
|
AVIOInterruptCB interrupt_callback;
|
|
} URLContext;
|
|
|
|
typedef struct URLProtocol {
|
|
const char *name;
|
|
int (*url_open)( URLContext *h, const char *url, int flags);
|
|
/**
|
|
* This callback is to be used by protocols which open further nested
|
|
* protocols. options are then to be passed to ffurl_open()/ffurl_connect()
|
|
* for those nested protocols.
|
|
*/
|
|
int (*url_open2)(URLContext *h, const char *url, int flags, AVDictionary **options);
|
|
|
|
/**
|
|
* Read data from the protocol.
|
|
* If data is immediately available (even less than size), EOF is
|
|
* reached or an error occurs (including EINTR), return immediately.
|
|
* Otherwise:
|
|
* In non-blocking mode, return AVERROR(EAGAIN) immediately.
|
|
* In blocking mode, wait for data/EOF/error with a short timeout (0.1s),
|
|
* and return AVERROR(EAGAIN) on timeout.
|
|
* Checking interrupt_callback, looping on EINTR and EAGAIN and until
|
|
* enough data has been read is left to the calling function; see
|
|
* retry_transfer_wrapper in avio.c.
|
|
*/
|
|
int (*url_read)( 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);
|
|
struct URLProtocol *next;
|
|
int (*url_read_pause)(URLContext *h, int pause);
|
|
int64_t (*url_read_seek)(URLContext *h, int stream_index,
|
|
int64_t timestamp, int flags);
|
|
int (*url_get_file_handle)(URLContext *h);
|
|
int (*url_get_multi_file_handle)(URLContext *h, int **handles,
|
|
int *numhandles);
|
|
int (*url_shutdown)(URLContext *h, int flags);
|
|
int priv_data_size;
|
|
const AVClass *priv_data_class;
|
|
int flags;
|
|
int (*url_check)(URLContext *h, int mask);
|
|
} URLProtocol;
|
|
|
|
/**
|
|
* Create a URLContext for accessing to the resource indicated by
|
|
* url, but do not initiate the connection yet.
|
|
*
|
|
* @param puc pointer to the location where, in case of success, the
|
|
* function puts the pointer to the created URLContext
|
|
* @param flags flags which control how the resource indicated by url
|
|
* is to be opened
|
|
* @param int_cb interrupt callback to use for the URLContext, may be
|
|
* NULL
|
|
* @return 0 in case of success, a negative value corresponding to an
|
|
* AVERROR code in case of failure
|
|
*/
|
|
int ffurl_alloc(URLContext **puc, const char *filename, int flags,
|
|
const AVIOInterruptCB *int_cb);
|
|
|
|
/**
|
|
* Connect an URLContext that has been allocated by ffurl_alloc
|
|
*
|
|
* @param 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.
|
|
*/
|
|
int ffurl_connect(URLContext *uc, AVDictionary **options);
|
|
|
|
/**
|
|
* Create an URLContext for accessing to the resource indicated by
|
|
* url, and open it.
|
|
*
|
|
* @param puc pointer to the location where, in case of success, the
|
|
* function puts the pointer to the created URLContext
|
|
* @param flags flags which control how the resource indicated by url
|
|
* is to be opened
|
|
* @param int_cb interrupt callback to use for the URLContext, may be
|
|
* NULL
|
|
* @param 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.
|
|
* @return 0 in case of success, a negative value corresponding to an
|
|
* AVERROR code in case of failure
|
|
*/
|
|
int ffurl_open(URLContext **puc, const char *filename, int flags,
|
|
const AVIOInterruptCB *int_cb, AVDictionary **options);
|
|
|
|
/**
|
|
* Read up to size bytes from the resource accessed by h, and store
|
|
* the read bytes in buf.
|
|
*
|
|
* @return 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).
|
|
*/
|
|
int ffurl_read(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.
|
|
*/
|
|
int ffurl_read_complete(URLContext *h, unsigned char *buf, int size);
|
|
|
|
/**
|
|
* Write size bytes from buf to the resource accessed by h.
|
|
*
|
|
* @return the number of bytes actually written, or a negative value
|
|
* corresponding to an AVERROR code in case of failure
|
|
*/
|
|
int ffurl_write(URLContext *h, const unsigned char *buf, int size);
|
|
|
|
/**
|
|
* Change the position that will be used by the next read/write
|
|
* operation on the resource accessed by h.
|
|
*
|
|
* @param pos specifies the new position to set
|
|
* @param 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).
|
|
* @return 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.
|
|
*/
|
|
int64_t ffurl_seek(URLContext *h, int64_t pos, int whence);
|
|
|
|
/**
|
|
* Close the resource accessed by the URLContext h, and free the
|
|
* memory used by it.
|
|
*
|
|
* @return a negative value if an error condition occurred, 0
|
|
* otherwise
|
|
*/
|
|
int ffurl_close(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.
|
|
*/
|
|
int64_t ffurl_size(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.
|
|
*
|
|
* @return the file descriptor associated with this URL, or <0 on error.
|
|
*/
|
|
int ffurl_get_file_handle(URLContext *h);
|
|
|
|
/**
|
|
* Return the file descriptors associated with this URL.
|
|
*
|
|
* @return 0 on success or <0 on error.
|
|
*/
|
|
int ffurl_get_multi_file_handle(URLContext *h, int **handles, int *numhandles);
|
|
|
|
/**
|
|
* Signal the URLContext that we are done reading or writing the stream.
|
|
*
|
|
* @param h pointer to the resource
|
|
* @param flags flags which control how the resource indicated by url
|
|
* is to be shutdown
|
|
*
|
|
* @return a negative value if an error condition occurred, 0
|
|
* otherwise
|
|
*/
|
|
int ffurl_shutdown(URLContext *h, int flags);
|
|
|
|
/**
|
|
* Register the URLProtocol protocol.
|
|
*/
|
|
int ffurl_register_protocol(URLProtocol *protocol);
|
|
|
|
/**
|
|
* Check if the user has requested to interrup a blocking function
|
|
* associated with cb.
|
|
*/
|
|
int ff_check_interrupt(AVIOInterruptCB *cb);
|
|
|
|
/**
|
|
* Iterate over all available protocols.
|
|
*
|
|
* @param prev result of the previous call to this functions or NULL.
|
|
*/
|
|
URLProtocol *ffurl_protocol_next(const URLProtocol *prev);
|
|
|
|
/* udp.c */
|
|
int ff_udp_set_remote_url(URLContext *h, const char *uri);
|
|
int ff_udp_get_local_port(URLContext *h);
|
|
|
|
/**
|
|
* 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 av_url_split
|
|
*
|
|
* @param str the buffer to fill with the url
|
|
* @param size the size of the str buffer
|
|
* @param proto the protocol identifier, if null, the separator
|
|
* after the identifier is left out, too
|
|
* @param authorization an optional authorization string, may be null.
|
|
* An empty string is treated the same as a null string.
|
|
* @param hostname the host name string
|
|
* @param port the port number, left out from the string if negative
|
|
* @param fmt a generic format string for everything to add after the
|
|
* host/port, may be null
|
|
* @return the number of characters written to the destination buffer
|
|
*/
|
|
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, 8);
|
|
|
|
/*
|
|
* Convert a relative url into an absolute url, given a base url.
|
|
*
|
|
* @param buf the buffer where output absolute url is written
|
|
* @param size the size of buf
|
|
* @param base the base url, may be equal to buf.
|
|
* @param rel the new url, which is interpreted relative to base
|
|
*/
|
|
void ff_make_absolute_url(char *buf, int size, const char *base,
|
|
const char *rel);
|
|
|
|
|
|
#endif /* AVFORMAT_URL_H */
|