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250 lines
9.2 KiB
C
250 lines
9.2 KiB
C
/*
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* netcam.h
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*
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* Include file for handling network cameras.
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*
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* This code was inspired by the original netcam.c module
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* written by Jeroen Vreeken and enhanced by several Motion
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* project contributors, particularly Angel Carpintero and
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* Christopher Price.
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*
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* Copyright 2005, William M. Brack
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* This software is distributed under the GNU Public license
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* Version 2. See also the file 'COPYING'.
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*/
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#ifndef _INCLUDE_NETCAM_H
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#define _INCLUDE_NETCAM_H
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#include <jpeglib.h>
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#include <setjmp.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <regex.h>
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/*
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* We are aiming to get the gcc compilation of motion practically "warning
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* free", when using all the possible warning switches. The following macro
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* is to allow some function prototypes to include parameters which, at the
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* moment, are not used, but either still "need to be declared", or else are
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* planned to be used in the near future. Eventually this macro will go into
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* motion.h, but that will be a little later.
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*/
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/**
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* ATTRIBUTE_UNUSED:
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*
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* Macro used to signal to GCC unused function parameters
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*/
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#ifdef __GNUC__
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#ifdef HAVE_ANSIDECL_H
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#include <ansidecl.h>
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#endif
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#ifndef ATTRIBUTE_UNUSED
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#define ATTRIBUTE_UNUSED __attribute__((unused))
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#endif
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#else
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#define ATTRIBUTE_UNUSED
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#endif
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/* netcam_wget.h needs to have netcam_context_ptr */
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typedef struct netcam_context *netcam_context_ptr;
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#include "netcam_wget.h" /* needed for struct rbuf */
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#define NETCAM_BUFFSIZE 4096 /* Initial size reserved for a JPEG
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image. If expansion is required,
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this value is also used for the
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amount to increase. */
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/*
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* Error return codes for netcam routines. The values are "bit
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* significant". All error returns will return bit 1 set to indicate
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* these are "netcam errors"; additional bits set will give more detail
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* as to what kind of error it was.
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* Bit 0 is reserved for V4L type errors.
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*
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*/
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#define NETCAM_GENERAL_ERROR 0x02 /* binary 000010 */
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#define NETCAM_NOTHING_NEW_ERROR 0x06 /* binary 000110 */
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#define NETCAM_JPEG_CONV_ERROR 0x0a /* binary 001010 */
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#define NETCAM_RESTART_ERROR 0x12 /* binary 010010 */
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#define NETCAM_FATAL_ERROR -2
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/*
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* struct url_t is used when parsing the user-supplied URL, as well as
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* when attempting to connect to the netcam.
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*/
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struct url_t {
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char *service;
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char *userpass;
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char *host;
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int port;
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char *path;
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};
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/*
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* We use a special "triple-buffer" technique. There are
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* three separate buffers (latest, receiving and jpegbuf)
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* which are each described using a struct netcam_image_buff
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*/
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typedef struct netcam_image_buff {
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char *ptr;
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int content_length;
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size_t size; /* total allocated size */
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size_t used; /* bytes already used */
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struct timeval image_time; /* time this image was received */
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} netcam_buff;
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typedef netcam_buff *netcam_buff_ptr;
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typedef struct file_context {
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char *path; /* the path within the URL */
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int control_file_desc; /* file descriptor for the control socket */
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time_t last_st_mtime; /* time this image was modified */
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} tfile_context;
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/*
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* struct netcam_context contains all the structures and other data
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* for an individual netcam.
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*/
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typedef struct netcam_context {
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struct context *cnt; /* pointer to parent motion
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context structure */
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int finish; /* flag to break the camera-
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handling thread out of it's
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infinite loop in emergency */
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int threadnr; /* motion's thread number for
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the camera-handling thread
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(if required). Used for
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error reporting */
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pthread_t thread_id; /* thread i.d. for a camera-
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handling thread (if required).
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Not currently used, but may be
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useful in the future */
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pthread_mutex_t mutex; /* mutex used with conditional waits */
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pthread_cond_t exiting; /* pthread condition structure to let
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the camera-handler acknowledge that
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it's finished */
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pthread_cond_t cap_cond; /* pthread condition structure to
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initiate next capture request (used
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only with non-streaming cameras */
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pthread_cond_t pic_ready; /* pthread condition structure used
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for synchronisation between the
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camera handler and the motion main
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loop, showing new frame is ready */
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int start_capture; /* besides our signalling condition,
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we also keep a flag to assure the
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camera-handler will always start
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a new cycle as soon as possible,
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even if it's not currently waiting
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on the condition. */
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char *connect_host; /* the host to connect to (may be
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either the camera host, or
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possibly a proxy) */
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int connect_port; /* usually will be 80, but can be
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specified as something else by
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the user */
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char *connect_request; /* contains the complete string
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required for connection to the
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camera */
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int sock; /* fd for the camera's socket.
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Note that this value is also
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present within the struct
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rbuf *response. */
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struct timeval timeout; /* The current timeout setting for
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the socket. */
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struct rbuf *response; /* this structure (defined in the
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netcam_wget module) contains
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the context for an HTTP
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connection. Note that this
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structure includes a large
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buffer for the HTTP data */
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struct ftp_context *ftp; /* this structure contains the
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context for FTP connection */
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struct file_context *file; /* this structure contains the
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context for FILE connection */
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int (*get_image)(netcam_context_ptr);
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/* Function to fetch the image from
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the netcam. It is initialised in
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netcam_setup depending upon whether
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the picture source is from an http
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server or from an ftp server */
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struct netcam_caps { /* netcam capabilities: */
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unsigned char streaming; /* 1 - supported */
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unsigned char content_length; /* 0 - unsupported */
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} caps;
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char *boundary; /* 'boundary' string when used to
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separate mjpeg images */
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size_t boundary_length; /* string length of the boundary
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string */
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/* Three separate buffers are used
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for handling the data. Their
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definitions follow: */
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netcam_buff_ptr latest; /* This buffer contains the latest
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frame received from the camera */
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netcam_buff_ptr receiving; /* This buffer is used for receiving
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data from the camera */
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netcam_buff_ptr jpegbuf; /* This buffer is used for jpeg
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decompression */
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int imgcnt; /* count for # of received jpegs */
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int imgcnt_last; /* remember last count to check if a new
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image arrived */
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int error_count; /* simple count of number of errors since
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last good frame was received */
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unsigned int width; /* info for decompression */
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unsigned int height;
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struct timeval last_image; /* time the most recent image was
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received */
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float av_frame_time; /* "running average" of time between
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successive frames (microseconds) */
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struct jpeg_error_mgr jerr;
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jmp_buf setjmp_buffer;
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int jpeg_error; /* flag to show error or warning
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occurred during decompression*/
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} netcam_context;
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/*
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* Declare prototypes for our external entry points
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*/
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/* Within netcam_jpeg.c */
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int netcam_proc_jpeg (struct netcam_context *, unsigned char *);
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void netcam_get_dimensions (struct netcam_context *);
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/* Within netcam.c */
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int netcam_start (struct context *);
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int netcam_next (struct context *, unsigned char *);
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void netcam_cleanup (struct netcam_context *, int);
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ssize_t netcam_recv(netcam_context_ptr, void *, size_t);
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#endif
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