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304 lines
10 KiB
304 lines
10 KiB
/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* Generic File Format Support.
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*
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* Copyright (C) 1999, Mark Spencer
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*
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* Mark Spencer <markster@linux-support.net>
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License
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*/
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#ifndef _ASTERISK_FILE_H
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#define _ASTERISK_FILE_H
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#include <asterisk/channel.h>
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#include <asterisk/frame.h>
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#include <fcntl.h>
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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//! Convenient for waiting
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#define AST_DIGIT_ANY "0123456789#*"
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#define SEEK_FORCECUR 10
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/* Defined by individual formats. First item MUST be a
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pointer for use by the stream manager */
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struct ast_filestream;
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//! Registers a new file format
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/*! Register a new file format capability
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* Adds a format to asterisk's format abilities. Fill in the fields, and it will work. For examples, look at some of the various format code.
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* returns 0 on success, -1 on failure
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*/
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int ast_format_register(char *name, char *exts, int format,
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struct ast_filestream * (*open)(int fd),
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struct ast_filestream * (*rewrite)(int fd, char *comment),
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int (*write)(struct ast_filestream *, struct ast_frame *),
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int (*seek)(struct ast_filestream *, long offset, int whence),
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int (*trunc)(struct ast_filestream *),
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long (*tell)(struct ast_filestream *),
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struct ast_frame * (*read)(struct ast_filestream *, int *timetonext),
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void (*close)(struct ast_filestream *),
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char * (*getcomment)(struct ast_filestream *));
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//! Unregisters a file format
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/*!
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* \param name the name of the format you wish to unregister
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* Unregisters a format based on the name of the format.
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* Returns 0 on success, -1 on failure to unregister
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*/
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int ast_format_unregister(char *name);
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//! Streams a file
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/*!
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* \param c channel to stream the file to
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* \param filename the name of the file you wish to stream, minus the extension
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* \param preflang the preferred language you wish to have the file streamed to you in
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* Prepares a channel for the streaming of a file. To start the stream, afterward do a ast_waitstream() on the channel
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* Also, it will stop any existing streams on the channel.
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* Returns 0 on success, or -1 on failure.
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*/
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int ast_streamfile(struct ast_channel *c, char *filename, char *preflang);
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//! Stops a stream
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/*!
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* \param c The channel you wish to stop playback on
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* Stop playback of a stream
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* Returns 0 regardless
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*/
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int ast_stopstream(struct ast_channel *c);
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//! Checks for the existence of a given file
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/*!
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* \param filename name of the file you wish to check, minus the extension
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* \param fmt the format you wish to check (the extension)
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* \param preflang (the preferred language you wisht to find the file in)
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* See if a given file exists in a given format. If fmt is NULL, any format is accepted.
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* Returns -1 if file does not exist, non-zero positive otherwise.
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*/
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int ast_fileexists(char *filename, char *fmt, char *preflang);
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//! Renames a file
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/*!
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* \param oldname the name of the file you wish to act upon (minus the extension)
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* \param newname the name you wish to rename the file to (minus the extension)
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* \param fmt the format of the file
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* Rename a given file in a given format, or if fmt is NULL, then do so for all
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* Returns -1 on failure
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*/
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int ast_filerename(char *oldname, char *newname, char *fmt);
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//! Deletes a file
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/*!
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* \param filename name of the file you wish to delete (minus the extension)
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* \param format of the file
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* Delete a given file in a given format, or if fmt is NULL, then do so for all
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*/
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int ast_filedelete(char *filename, char *fmt);
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//! Copies a file
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/*!
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* \param oldname name of the file you wish to copy (minus extension)
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* \param newname name you wish the file to be copied to (minus extension)
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* \param fmt the format of the file
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* Copy a given file in a given format, or if fmt is NULL, then do so for all
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*/
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int ast_filecopy(char *oldname, char *newname, char *fmt);
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//! Waits for a stream to stop or digit to be pressed
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/*!
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* \param c channel to waitstram on
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* \param breakon string of DTMF digits to break upon
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* Begins playback of a stream...
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* Wait for a stream to stop or for any one of a given digit to arrive, Returns 0
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* if the stream finishes, the character if it was interrupted, and -1 on error
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*/
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char ast_waitstream(struct ast_channel *c, char *breakon);
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//! Same as waitstream but allows stream to be forwarded or rewound
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/*!
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* \param c channel to waitstram on
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* \param breakon string of DTMF digits to break upon
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* \param forward DTMF digit to fast forward upon
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* \param rewind DTMF digit to rewind upon
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* \param ms How many miliseconds to skip forward/back
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* Begins playback of a stream...
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* Wait for a stream to stop or for any one of a given digit to arrive, Returns 0
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* if the stream finishes, the character if it was interrupted, and -1 on error
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*/
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char ast_waitstream_fr(struct ast_channel *c, char *breakon, char *forward, char *rewind, int ms);
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/* Same as waitstream, but with audio output to fd and monitored fd checking. Returns
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1 if monfd is ready for reading */
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char ast_waitstream_full(struct ast_channel *c, char *breakon, int audiofd, int monfd);
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//! Starts reading from a file
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/*!
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* \param filename the name of the file to read from
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* \param type format of file you wish to read from
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* \param comment comment to go with
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* \param flags file flags
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* \param check (unimplemented, hence negligible)
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* \param mode Open mode
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* Open an incoming file stream. flags are flags for the open() command, and
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* if check is non-zero, then it will not read a file if there are any files that
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* start with that name and have an extension
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* Please note, this is a blocking function. Program execution will not return until ast_waitstream completes it's execution.
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* Returns a struct ast_filestream on success, NULL on failure
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*/
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struct ast_filestream *ast_readfile(char *filename, char *type, char *comment, int flags, int check, mode_t mode);
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//! Starts writing a file
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/*!
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* \param filename the name of the file to write to
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* \param type format of file you wish to write out to
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* \param comment comment to go with
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* \param oflags output file flags
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* \param check (unimplemented, hence negligible)
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* \param mode Open mode
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* Create an outgoing file stream. oflags are flags for the open() command, and
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* if check is non-zero, then it will not write a file if there are any files that
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* start with that name and have an extension
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* Please note, this is a blocking function. Program execution will not return until ast_waitstream completes it's execution.
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* Returns a struct ast_filestream on success, NULL on failure
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*/
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struct ast_filestream *ast_writefile(char *filename, char *type, char *comment, int flags, int check, mode_t mode);
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//! Writes a frame to a stream
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/*!
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* \param fs filestream to write to
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* \param f frame to write to the filestream
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* Send a frame to a filestream -- note: does NOT free the frame, call ast_frfree manually
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* Returns 0 on success, -1 on failure.
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*/
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int ast_writestream(struct ast_filestream *fs, struct ast_frame *f);
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//! Closes a stream
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/*!
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* \param f filestream to close
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* Close a playback or recording stream
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* Returns 0 on success, -1 on failure
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*/
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int ast_closestream(struct ast_filestream *f);
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//! Opens stream for use in seeking, playing
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/*!
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* \param chan channel to work with
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* \param filename to use
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* \param preflang prefered language to use
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* Returns a ast_filestream pointer if it opens the file, NULL on error
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*/
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struct ast_filestream *ast_openstream(struct ast_channel *chan, char *filename, char *preflang);
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//! Opens stream for use in seeking, playing
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/*!
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* \param chan channel to work with
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* \param filename to use
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* \param preflang prefered language to use
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* Returns a ast_filestream pointer if it opens the file, NULL on error
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*/
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struct ast_filestream *ast_openvstream(struct ast_channel *chan, char *filename, char *preflang);
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//! Applys a open stream to a channel.
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/*!
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* \param chan channel to work
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* \param ast_filestream s to apply
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* Returns 0 for success, -1 on failure
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*/
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int ast_applystream(struct ast_channel *chan, struct ast_filestream *s);
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//! play a open stream on a channel.
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/*!
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* \param ast_filestream s to play
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* Returns 0 for success, -1 on failure
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*/
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int ast_playstream(struct ast_filestream *s);
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//! Seeks into stream
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/*!
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* \param ast_filestream to perform seek on
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* \param sample_offset numbers of samples to seek
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* \param whence SEEK_SET, SEEK_CUR, SEEK_END
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* Returns 0 for success, or -1 for error
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*/
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int ast_seekstream(struct ast_filestream *fs, long sample_offset, int whence);
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//! Trunc stream at current location
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/*!
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* \param ast_filestream fs
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* Returns 0 for success, or -1 for error
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*/
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int ast_truncstream(struct ast_filestream *fs);
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//! Fast forward stream ms
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/*!
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* \param ast_filestream fs filestream to act on
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* \param ms milliseconds to move
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* Returns 0 for success, or -1 for error
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*/
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int ast_stream_fastforward(struct ast_filestream *fs, long ms);
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//! Rewind stream ms
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/*!
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* \param ast_filestream fs filestream to act on
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* \param ms milliseconds to move
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* Returns 0 for success, or -1 for error
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*/
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int ast_stream_rewind(struct ast_filestream *fs, long ms);
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//! Fast forward stream ms
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/*!
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* \param ast_filestream fs filestream to act on
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* \param ms milliseconds to move
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* Returns 0 for success, or -1 for error
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*/
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int ast_stream_fastforward(struct ast_filestream *fs, long ms);
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//! Rewind stream ms
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/*!
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* \param ast_filestream fs filestream to act on
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* \param ms milliseconds to move
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* Returns 0 for success, or -1 for error
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*/
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int ast_stream_rewind(struct ast_filestream *fs, long ms);
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//! Tell where we are in a stream
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/*!
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* \param ast_filestream fs to act on
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* Returns a long as a sample offset into stream
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*/
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long ast_tellstream(struct ast_filestream *fs);
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//! Read a frame from a filestream
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/*!
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* \param ast_filestream fs to act on
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* Returns a frame or NULL if read failed
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*/
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struct ast_frame *ast_readframe(struct ast_filestream *s);
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//! Initialize file stuff
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/*!
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* Initializes all the various file stuff. Basically just registers the cli stuff
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* Returns 0 all the time
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*/
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extern int ast_file_init(void);
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#define AST_RESERVED_POINTERS 20
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#if defined(__cplusplus) || defined(c_plusplus)
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}
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#endif
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#endif
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