ffmpeg / libavformat / avio.h @ 727c7aa0
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/*
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* copyright (c) 2001 Fabrice Bellard
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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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#ifndef AVFORMAT_AVIO_H
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#define AVFORMAT_AVIO_H
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/**
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* @file
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* unbuffered I/O operations
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*
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* @warning This file has to be considered an internal but installed
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* header, so it should not be directly included in your projects.
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*/
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#include <stdint.h> |
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#include "libavutil/common.h" |
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#include "libavutil/log.h" |
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#include "libavformat/version.h" |
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/* unbuffered I/O */
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/**
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* URL Context.
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* New fields can be added to the end with minor version bumps.
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* Removal, reordering and changes to existing fields require a major
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* version bump.
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* sizeof(URLContext) must not be used outside libav*.
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*/
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typedef struct URLContext { |
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#if FF_API_URL_CLASS
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const AVClass *av_class; ///< information for av_log(). Set by url_open(). |
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#endif
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struct URLProtocol *prot;
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int flags;
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int is_streamed; /**< true if streamed (no seek possible), default = false */ |
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int max_packet_size; /**< if non zero, the stream is packetized with this max packet size */ |
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void *priv_data;
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char *filename; /**< specified URL */ |
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int is_connected;
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} URLContext; |
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#if FF_API_OLD_AVIO
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typedef struct URLPollEntry { |
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URLContext *handle; |
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int events;
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int revents;
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} URLPollEntry; |
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#endif
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/**
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* @defgroup open_modes URL open modes
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* The flags argument to url_open and cosins must be one of the following
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* constants, optionally ORed with other flags.
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* @{
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*/
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#define URL_RDONLY 0 /**< read-only */ |
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#define URL_WRONLY 1 /**< write-only */ |
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#define URL_RDWR 2 /**< read-write */ |
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/**
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* @}
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*/
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/**
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* Use non-blocking mode.
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* If this flag is set, operations on the context will return
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* AVERROR(EAGAIN) if they can not be performed immediately.
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* If this flag is not set, operations on the context will never return
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* AVERROR(EAGAIN).
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* Note that this flag does not affect the opening/connecting of the
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* context. Connecting a protocol will always block if necessary (e.g. on
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* network protocols) but never hang (e.g. on busy devices).
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* Warning: non-blocking protocols is work-in-progress; this flag may be
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* silently ignored.
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*/
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#define URL_FLAG_NONBLOCK 4 |
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typedef int URLInterruptCB(void); |
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#if FF_API_OLD_AVIO
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/**
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* @defgroup old_url_funcs Old url_* functions
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* @deprecated use the buffered API based on AVIOContext instead
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* @{
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*/
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attribute_deprecated int url_open_protocol (URLContext **puc, struct URLProtocol *up, |
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const char *url, int flags); |
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attribute_deprecated int url_alloc(URLContext **h, const char *url, int flags); |
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attribute_deprecated int url_connect(URLContext *h);
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attribute_deprecated int url_open(URLContext **h, const char *url, int flags); |
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attribute_deprecated int url_read(URLContext *h, unsigned char *buf, int size); |
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attribute_deprecated int url_read_complete(URLContext *h, unsigned char *buf, int size); |
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attribute_deprecated int url_write(URLContext *h, const unsigned char *buf, int size); |
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attribute_deprecated int64_t url_seek(URLContext *h, int64_t pos, int whence);
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attribute_deprecated int url_close(URLContext *h);
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attribute_deprecated int64_t url_filesize(URLContext *h); |
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attribute_deprecated int url_get_file_handle(URLContext *h);
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attribute_deprecated int url_get_max_packet_size(URLContext *h);
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attribute_deprecated void url_get_filename(URLContext *h, char *buf, int buf_size); |
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#endif
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/**
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* Return a non-zero value if the resource indicated by url
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* exists, 0 otherwise.
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*/
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int url_exist(const char *url); |
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/**
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* The callback is called in blocking functions to test regulary if
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* asynchronous interruption is needed. AVERROR_EXIT is returned
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* in this case by the interrupted function. 'NULL' means no interrupt
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* callback is given.
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*/
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void url_set_interrupt_cb(URLInterruptCB *interrupt_cb);
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#if FF_API_OLD_AVIO
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/* not implemented */
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attribute_deprecated int url_poll(URLPollEntry *poll_table, int n, int timeout); |
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#endif
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/**
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* Pause and resume playing - only meaningful if using a network streaming
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* protocol (e.g. MMS).
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* @param pause 1 for pause, 0 for resume
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*/
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int av_url_read_pause(URLContext *h, int pause); |
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/**
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* Seek to a given timestamp relative to some component stream.
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* Only meaningful if using a network streaming protocol (e.g. MMS.).
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* @param stream_index The stream index that the timestamp is relative to.
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* If stream_index is (-1) the timestamp should be in AV_TIME_BASE
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* units from the beginning of the presentation.
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* If a stream_index >= 0 is used and the protocol does not support
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* seeking based on component streams, the call will fail with ENOTSUP.
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* @param timestamp timestamp in AVStream.time_base units
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* or if there is no stream specified then in AV_TIME_BASE units.
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* @param flags Optional combination of AVSEEK_FLAG_BACKWARD, AVSEEK_FLAG_BYTE
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* and AVSEEK_FLAG_ANY. The protocol may silently ignore
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* AVSEEK_FLAG_BACKWARD and AVSEEK_FLAG_ANY, but AVSEEK_FLAG_BYTE will
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* fail with ENOTSUP if used and not supported.
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* @return >= 0 on success
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* @see AVInputFormat::read_seek
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*/
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int64_t av_url_read_seek(URLContext *h, int stream_index,
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int64_t timestamp, int flags);
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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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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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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 priv_data_size;
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const AVClass *priv_data_class;
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int flags;
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} URLProtocol; |
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#if FF_API_REGISTER_PROTOCOL
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extern URLProtocol *first_protocol;
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#endif
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extern URLInterruptCB *url_interrupt_cb;
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/**
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* If protocol is NULL, returns the first registered protocol,
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* if protocol is non-NULL, returns the next registered protocol after protocol,
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* or NULL if protocol is the last one.
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*/
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URLProtocol *av_protocol_next(URLProtocol *p); |
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#if FF_API_REGISTER_PROTOCOL
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/**
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* @deprecated Use av_register_protocol() instead.
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*/
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attribute_deprecated int register_protocol(URLProtocol *protocol);
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/**
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* @deprecated Use av_register_protocol2() instead.
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*/
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attribute_deprecated int av_register_protocol(URLProtocol *protocol);
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#endif
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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 av_register_protocol2(URLProtocol *protocol, int size); |
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#define AVIO_SEEKABLE_NORMAL 0x0001 /**< Seeking works like for a local file */ |
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/**
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* @}
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*/
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/**
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* Bytestream IO Context.
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* New fields can be added to the end with minor version bumps.
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* Removal, reordering and changes to existing fields require a major
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* version bump.
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* sizeof(AVIOContext) must not be used outside libav*.
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*/
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typedef struct { |
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unsigned char *buffer; |
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int buffer_size;
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unsigned char *buf_ptr, *buf_end; |
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void *opaque;
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int (*read_packet)(void *opaque, uint8_t *buf, int buf_size); |
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int (*write_packet)(void *opaque, uint8_t *buf, int buf_size); |
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int64_t (*seek)(void *opaque, int64_t offset, int whence); |
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int64_t pos; /**< position in the file of the current buffer */
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int must_flush; /**< true if the next seek should flush */ |
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int eof_reached; /**< true if eof reached */ |
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int write_flag; /**< true if open for writing */ |
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#if FF_API_OLD_AVIO
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attribute_deprecated int is_streamed;
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#endif
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int max_packet_size;
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unsigned long checksum; |
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unsigned char *checksum_ptr; |
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unsigned long (*update_checksum)(unsigned long checksum, const uint8_t *buf, unsigned int size); |
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int error; ///< contains the error code or 0 if no error happened |
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int (*read_pause)(void *opaque, int pause); |
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int64_t (*read_seek)(void *opaque, int stream_index, |
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int64_t timestamp, int flags);
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/**
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* A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
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*/
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int seekable;
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} AVIOContext; |
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#if FF_API_OLD_AVIO
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typedef attribute_deprecated AVIOContext ByteIOContext;
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attribute_deprecated int init_put_byte(AVIOContext *s,
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unsigned char *buffer, |
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int buffer_size,
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int write_flag,
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void *opaque,
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int (*read_packet)(void *opaque, uint8_t *buf, int buf_size), |
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int (*write_packet)(void *opaque, uint8_t *buf, int buf_size), |
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int64_t (*seek)(void *opaque, int64_t offset, int whence)); |
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attribute_deprecated AVIOContext *av_alloc_put_byte( |
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unsigned char *buffer, |
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int buffer_size,
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int write_flag,
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void *opaque,
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int (*read_packet)(void *opaque, uint8_t *buf, int buf_size), |
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int (*write_packet)(void *opaque, uint8_t *buf, int buf_size), |
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int64_t (*seek)(void *opaque, int64_t offset, int whence)); |
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/**
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* @defgroup old_avio_funcs Old put_/get_*() functions
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* @deprecated use the avio_ -prefixed functions instead.
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* @{
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*/
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attribute_deprecated int get_buffer(AVIOContext *s, unsigned char *buf, int size); |
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attribute_deprecated int get_partial_buffer(AVIOContext *s, unsigned char *buf, int size); |
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attribute_deprecated int get_byte(AVIOContext *s);
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attribute_deprecated unsigned int get_le16(AVIOContext *s); |
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attribute_deprecated unsigned int get_le24(AVIOContext *s); |
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attribute_deprecated unsigned int get_le32(AVIOContext *s); |
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attribute_deprecated uint64_t get_le64(AVIOContext *s); |
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attribute_deprecated unsigned int get_be16(AVIOContext *s); |
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attribute_deprecated unsigned int get_be24(AVIOContext *s); |
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attribute_deprecated unsigned int get_be32(AVIOContext *s); |
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attribute_deprecated uint64_t get_be64(AVIOContext *s); |
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attribute_deprecated void put_byte(AVIOContext *s, int b); |
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attribute_deprecated void put_nbyte(AVIOContext *s, int b, int count); |
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attribute_deprecated void put_buffer(AVIOContext *s, const unsigned char *buf, int size); |
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attribute_deprecated void put_le64(AVIOContext *s, uint64_t val);
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attribute_deprecated void put_be64(AVIOContext *s, uint64_t val);
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attribute_deprecated void put_le32(AVIOContext *s, unsigned int val); |
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attribute_deprecated void put_be32(AVIOContext *s, unsigned int val); |
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attribute_deprecated void put_le24(AVIOContext *s, unsigned int val); |
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attribute_deprecated void put_be24(AVIOContext *s, unsigned int val); |
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attribute_deprecated void put_le16(AVIOContext *s, unsigned int val); |
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attribute_deprecated void put_be16(AVIOContext *s, unsigned int val); |
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attribute_deprecated void put_tag(AVIOContext *s, const char *tag); |
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/**
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* @}
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*/
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attribute_deprecated int av_url_read_fpause(AVIOContext *h, int pause); |
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attribute_deprecated int64_t av_url_read_fseek (AVIOContext *h, int stream_index,
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int64_t timestamp, int flags);
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/**
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* @defgroup old_url_f_funcs Old url_f* functions
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* @deprecated use the avio_ -prefixed functions instead.
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* @{
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*/
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attribute_deprecated int url_fopen( AVIOContext **s, const char *url, int flags); |
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attribute_deprecated int url_fclose(AVIOContext *s);
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attribute_deprecated int64_t url_fseek(AVIOContext *s, int64_t offset, int whence);
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attribute_deprecated int url_fskip(AVIOContext *s, int64_t offset);
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attribute_deprecated int64_t url_ftell(AVIOContext *s); |
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attribute_deprecated int64_t url_fsize(AVIOContext *s); |
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#define URL_EOF (-1) |
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attribute_deprecated int url_fgetc(AVIOContext *s);
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attribute_deprecated int url_setbufsize(AVIOContext *s, int buf_size); |
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#ifdef __GNUC__
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attribute_deprecated int url_fprintf(AVIOContext *s, const char *fmt, ...) __attribute__ ((__format__ (__printf__, 2, 3))); |
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#else
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attribute_deprecated int url_fprintf(AVIOContext *s, const char *fmt, ...); |
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#endif
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attribute_deprecated void put_flush_packet(AVIOContext *s);
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attribute_deprecated int url_open_dyn_buf(AVIOContext **s);
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attribute_deprecated int url_open_dyn_packet_buf(AVIOContext **s, int max_packet_size); |
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attribute_deprecated int url_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer);
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attribute_deprecated int url_fdopen(AVIOContext **s, URLContext *h);
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/**
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* @}
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*/
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/**
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* @deprecated use AVIOContext.eof_reached
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*/
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attribute_deprecated int url_feof(AVIOContext *s);
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attribute_deprecated int url_ferror(AVIOContext *s);
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attribute_deprecated int udp_set_remote_url(URLContext *h, const char *uri); |
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attribute_deprecated int udp_get_local_port(URLContext *h);
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attribute_deprecated void init_checksum(AVIOContext *s,
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unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), |
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unsigned long checksum); |
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attribute_deprecated unsigned long get_checksum(AVIOContext *s); |
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#endif
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/**
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* Allocate and initialize an AVIOContext for buffered I/O. It must be later
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* freed with av_free().
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*
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* @param buffer Memory block for input/output operations via AVIOContext.
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* @param buffer_size The buffer size is very important for performance.
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* For protocols with fixed blocksize it should be set to this blocksize.
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* For others a typical size is a cache page, e.g. 4kb.
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* @param write_flag Set to 1 if the buffer should be writable, 0 otherwise.
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* @param opaque An opaque pointer to user-specific data.
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* @param read_packet A function for refilling the buffer, may be NULL.
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* @param write_packet A function for writing the buffer contents, may be NULL.
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* @param seek A function for seeking to specified byte position, may be NULL.
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*
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* @return Allocated AVIOContext or NULL on failure.
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*/
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AVIOContext *avio_alloc_context( |
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unsigned char *buffer, |
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int buffer_size,
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int write_flag,
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void *opaque,
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int (*read_packet)(void *opaque, uint8_t *buf, int buf_size), |
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int (*write_packet)(void *opaque, uint8_t *buf, int buf_size), |
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int64_t (*seek)(void *opaque, int64_t offset, int whence)); |
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void avio_w8(AVIOContext *s, int b); |
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void avio_write(AVIOContext *s, const unsigned char *buf, int size); |
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void avio_wl64(AVIOContext *s, uint64_t val);
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void avio_wb64(AVIOContext *s, uint64_t val);
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void avio_wl32(AVIOContext *s, unsigned int val); |
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void avio_wb32(AVIOContext *s, unsigned int val); |
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void avio_wl24(AVIOContext *s, unsigned int val); |
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void avio_wb24(AVIOContext *s, unsigned int val); |
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void avio_wl16(AVIOContext *s, unsigned int val); |
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void avio_wb16(AVIOContext *s, unsigned int val); |
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#if FF_API_OLD_AVIO
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attribute_deprecated void put_strz(AVIOContext *s, const char *buf); |
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#endif
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/**
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* Write a NULL-terminated string.
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* @return number of bytes written.
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*/
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int avio_put_str(AVIOContext *s, const char *str); |
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/**
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* Convert an UTF-8 string to UTF-16LE and write it.
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* @return number of bytes written.
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*/
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int avio_put_str16le(AVIOContext *s, const char *str); |
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/**
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* Passing this as the "whence" parameter to a seek function causes it to
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* return the filesize without seeking anywhere. Supporting this is optional.
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* If it is not supported then the seek function will return <0.
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*/
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#define AVSEEK_SIZE 0x10000 |
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/**
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* Oring this flag as into the "whence" parameter to a seek function causes it to
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* seek by any means (like reopening and linear reading) or other normally unreasonble
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* means that can be extreemly slow.
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* This may be ignored by the seek code.
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*/
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#define AVSEEK_FORCE 0x20000 |
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/**
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* fseek() equivalent for AVIOContext.
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* @return new position or AVERROR.
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*/
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int64_t avio_seek(AVIOContext *s, int64_t offset, int whence);
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/**
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* Skip given number of bytes forward
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* @return new position or AVERROR.
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*/
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static av_always_inline int64_t avio_skip(AVIOContext *s, int64_t offset)
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{ |
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return avio_seek(s, offset, SEEK_CUR);
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} |
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/**
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* ftell() equivalent for AVIOContext.
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442 |
* @return position or AVERROR.
|
443 |
*/
|
444 |
static av_always_inline int64_t avio_tell(AVIOContext *s)
|
445 |
{ |
446 |
return avio_seek(s, 0, SEEK_CUR); |
447 |
} |
448 |
|
449 |
/**
|
450 |
* Get the filesize.
|
451 |
* @return filesize or AVERROR
|
452 |
*/
|
453 |
int64_t avio_size(AVIOContext *s); |
454 |
|
455 |
/** @warning currently size is limited */
|
456 |
#ifdef __GNUC__
|
457 |
int avio_printf(AVIOContext *s, const char *fmt, ...) __attribute__ ((__format__ (__printf__, 2, 3))); |
458 |
#else
|
459 |
int avio_printf(AVIOContext *s, const char *fmt, ...); |
460 |
#endif
|
461 |
|
462 |
#if FF_API_OLD_AVIO
|
463 |
/** @note unlike fgets, the EOL character is not returned and a whole
|
464 |
line is parsed. return NULL if first char read was EOF */
|
465 |
attribute_deprecated char *url_fgets(AVIOContext *s, char *buf, int buf_size); |
466 |
#endif
|
467 |
|
468 |
void avio_flush(AVIOContext *s);
|
469 |
|
470 |
|
471 |
/**
|
472 |
* Read size bytes from AVIOContext into buf.
|
473 |
* @return number of bytes read or AVERROR
|
474 |
*/
|
475 |
int avio_read(AVIOContext *s, unsigned char *buf, int size); |
476 |
|
477 |
/** @note return 0 if EOF, so you cannot use it if EOF handling is
|
478 |
necessary */
|
479 |
int avio_r8 (AVIOContext *s);
|
480 |
unsigned int avio_rl16(AVIOContext *s); |
481 |
unsigned int avio_rl24(AVIOContext *s); |
482 |
unsigned int avio_rl32(AVIOContext *s); |
483 |
uint64_t avio_rl64(AVIOContext *s); |
484 |
|
485 |
/**
|
486 |
* Read a string from pb into buf. The reading will terminate when either
|
487 |
* a NULL character was encountered, maxlen bytes have been read, or nothing
|
488 |
* more can be read from pb. The result is guaranteed to be NULL-terminated, it
|
489 |
* will be truncated if buf is too small.
|
490 |
* Note that the string is not interpreted or validated in any way, it
|
491 |
* might get truncated in the middle of a sequence for multi-byte encodings.
|
492 |
*
|
493 |
* @return number of bytes read (is always <= maxlen).
|
494 |
* If reading ends on EOF or error, the return value will be one more than
|
495 |
* bytes actually read.
|
496 |
*/
|
497 |
int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen); |
498 |
|
499 |
/**
|
500 |
* Read a UTF-16 string from pb and convert it to UTF-8.
|
501 |
* The reading will terminate when either a null or invalid character was
|
502 |
* encountered or maxlen bytes have been read.
|
503 |
* @return number of bytes read (is always <= maxlen)
|
504 |
*/
|
505 |
int avio_get_str16le(AVIOContext *pb, int maxlen, char *buf, int buflen); |
506 |
int avio_get_str16be(AVIOContext *pb, int maxlen, char *buf, int buflen); |
507 |
|
508 |
#if FF_API_OLD_AVIO
|
509 |
/**
|
510 |
* @deprecated use avio_get_str instead
|
511 |
*/
|
512 |
attribute_deprecated char *get_strz(AVIOContext *s, char *buf, int maxlen); |
513 |
#endif
|
514 |
unsigned int avio_rb16(AVIOContext *s); |
515 |
unsigned int avio_rb24(AVIOContext *s); |
516 |
unsigned int avio_rb32(AVIOContext *s); |
517 |
uint64_t avio_rb64(AVIOContext *s); |
518 |
|
519 |
#if FF_API_OLD_AVIO
|
520 |
/**
|
521 |
* @deprecated Use AVIOContext.seekable field directly.
|
522 |
*/
|
523 |
attribute_deprecated static inline int url_is_streamed(AVIOContext *s) |
524 |
{ |
525 |
return !s->seekable;
|
526 |
} |
527 |
#endif
|
528 |
|
529 |
#if FF_API_URL_RESETBUF
|
530 |
/** Reset the buffer for reading or writing.
|
531 |
* @note Will drop any data currently in the buffer without transmitting it.
|
532 |
* @param flags URL_RDONLY to set up the buffer for reading, or URL_WRONLY
|
533 |
* to set up the buffer for writing. */
|
534 |
int url_resetbuf(AVIOContext *s, int flags); |
535 |
#endif
|
536 |
|
537 |
/**
|
538 |
* Create and initialize a AVIOContext for accessing the
|
539 |
* resource indicated by url.
|
540 |
* @note When the resource indicated by url has been opened in
|
541 |
* read+write mode, the AVIOContext can be used only for writing.
|
542 |
*
|
543 |
* @param s Used to return the pointer to the created AVIOContext.
|
544 |
* In case of failure the pointed to value is set to NULL.
|
545 |
* @param flags flags which control how the resource indicated by url
|
546 |
* is to be opened
|
547 |
* @return 0 in case of success, a negative value corresponding to an
|
548 |
* AVERROR code in case of failure
|
549 |
*/
|
550 |
int avio_open(AVIOContext **s, const char *url, int flags); |
551 |
|
552 |
int avio_close(AVIOContext *s);
|
553 |
|
554 |
#if FF_API_OLD_AVIO
|
555 |
attribute_deprecated URLContext *url_fileno(AVIOContext *s); |
556 |
|
557 |
/**
|
558 |
* @deprecated use AVIOContext.max_packet_size directly.
|
559 |
*/
|
560 |
attribute_deprecated int url_fget_max_packet_size(AVIOContext *s);
|
561 |
|
562 |
attribute_deprecated int url_open_buf(AVIOContext **s, uint8_t *buf, int buf_size, int flags); |
563 |
|
564 |
/** return the written or read size */
|
565 |
attribute_deprecated int url_close_buf(AVIOContext *s);
|
566 |
#endif
|
567 |
|
568 |
/**
|
569 |
* Open a write only memory stream.
|
570 |
*
|
571 |
* @param s new IO context
|
572 |
* @return zero if no error.
|
573 |
*/
|
574 |
int avio_open_dyn_buf(AVIOContext **s);
|
575 |
|
576 |
/**
|
577 |
* Return the written size and a pointer to the buffer. The buffer
|
578 |
* must be freed with av_free().
|
579 |
* Padding of FF_INPUT_BUFFER_PADDING_SIZE is added to the buffer.
|
580 |
*
|
581 |
* @param s IO context
|
582 |
* @param pbuffer pointer to a byte buffer
|
583 |
* @return the length of the byte buffer
|
584 |
*/
|
585 |
int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer);
|
586 |
|
587 |
#if FF_API_UDP_GET_FILE
|
588 |
int udp_get_file_handle(URLContext *h);
|
589 |
#endif
|
590 |
|
591 |
#endif /* AVFORMAT_AVIO_H */ |