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mjpg-streamer/plugins/output_udp/output_udp.c

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/*******************************************************************************
# #
# MJPG-streamer allows to stream JPG frames from an input-plugin #
# to several output plugins #
# #
# Copyright (C) 2007 Tom Stöveken #
# #
# This program is free software; you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation; version 2 of the License. #
# #
# This program 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 General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program; if not, write to the Free Software #
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA #
# #
*******************************************************************************/
/*
This output plugin is based on code from output_file.c
Writen by Dimitrios Zachariadis
Version 0.1, May 2010
It provides a mechanism to take snapshots with a trigger from a UDP packet.
The UDP msg contains the path for the snapshot jpeg file
It echoes the message received back to the sender, after taking the snapshot
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <signal.h>
#include <sys/socket.h>
#include <resolv.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <getopt.h>
#include <pthread.h>
#include <fcntl.h>
#include <time.h>
#include <syslog.h>
#include <dirent.h>
#include "../../utils.h"
#include "../../mjpg_streamer.h"
#define OUTPUT_PLUGIN_NAME "UDP output plugin"
static pthread_t worker;
static globals *pglobal;
static int fd, delay, max_frame_size;
static char *folder = "/tmp";
static unsigned char *frame = NULL;
static char *command = NULL;
static int input_number = 0;
// UDP port
static int port = 0;
/******************************************************************************
Description.: print a help message
Input Value.: -
Return Value: -
******************************************************************************/
void help(void)
{
fprintf(stderr, " ---------------------------------------------------------------\n" \
" Help for output plugin..: "OUTPUT_PLUGIN_NAME"\n" \
" ---------------------------------------------------------------\n" \
" The following parameters can be passed to this plugin:\n\n" \
" [-f | --folder ]........: folder to save pictures\n" \
" [-d | --delay ].........: delay after saving pictures in ms\n" \
" [-c | --command ].......: execute command after saveing picture\n" \
" [-p | --port ]..........: UDP port to listen for picture requests. UDP message is the filename to save\n\n" \
" [-i | --input ].......: read frames from the specified input plugin (first input plugin between the arguments is the 0th)\n\n" \
" ---------------------------------------------------------------\n");
}
/******************************************************************************
Description.: clean up allocated resources
Input Value.: unused argument
Return Value: -
******************************************************************************/
void worker_cleanup(void *arg)
{
static unsigned char first_run = 1;
if(!first_run) {
DBG("already cleaned up resources\n");
return;
}
first_run = 0;
OPRINT("cleaning up resources allocated by worker thread\n");
if(frame != NULL) {
free(frame);
}
close(fd);
}
/******************************************************************************
Description.: this is the main worker thread
it loops forever, grabs a fresh frame and stores it to file
Input Value.:
Return Value:
******************************************************************************/
void *worker_thread(void *arg)
{
int ok = 1, frame_size = 0, rc = 0;
char buffer1[1024] = {0};
unsigned char *tmp_framebuffer = NULL;
/* set cleanup handler to cleanup allocated resources */
pthread_cleanup_push(worker_cleanup, NULL);
// set UDP server data structures ---------------------------
if(port <= 0) {
OPRINT("a valid UDP port must be provided\n");
return NULL;
}
struct sockaddr_in addr;
int sd;
int bytes;
unsigned int addr_len = sizeof(addr);
char udpbuffer[1024] = {0};
sd = socket(PF_INET, SOCK_DGRAM, 0);
bzero(&addr, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = INADDR_ANY;
addr.sin_port = htons(port);
if(bind(sd, (struct sockaddr*)&addr, sizeof(addr)) != 0)
perror("bind");
// -----------------------------------------------------------
while(ok >= 0 && !pglobal->stop) {
DBG("waiting for a UDP message\n");
// UDP receive ---------------------------------------------
memset(udpbuffer, 0, sizeof(udpbuffer));
bytes = recvfrom(sd, udpbuffer, sizeof(udpbuffer), 0, (struct sockaddr*)&addr, &addr_len);
// ---------------------------------------------------------
DBG("waiting for fresh frame\n");
pthread_mutex_lock(&pglobal->in[input_number].db);
pthread_cond_wait(&pglobal->in[input_number].db_update, &pglobal->in[input_number].db);
/* read buffer */
frame_size = pglobal->in[input_number].size;
/* check if buffer for frame is large enough, increase it if necessary */
if(frame_size > max_frame_size) {
DBG("increasing buffer size to %d\n", frame_size);
max_frame_size = frame_size + (1 << 16);
if((tmp_framebuffer = realloc(frame, max_frame_size)) == NULL) {
pthread_mutex_unlock(&pglobal->in[input_number].db);
LOG("not enough memory\n");
return NULL;
}
frame = tmp_framebuffer;
}
/* copy frame to our local buffer now */
memcpy(frame, pglobal->in[input_number].buf, frame_size);
/* allow others to access the global buffer again */
pthread_mutex_unlock(&pglobal->in[input_number].db);
/* only save a file if a name came in with the UDP message */
if(strlen(udpbuffer) > 0) {
DBG("writing file: %s\n", udpbuffer);
/* open file for write. Path must pre-exist */
if((fd = open(udpbuffer, O_CREAT | O_RDWR | O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) < 0) {
OPRINT("could not open the file %s\n", udpbuffer);
return NULL;
}
/* save picture to file */
if(write(fd, frame, frame_size) < 0) {
OPRINT("could not write to file %s\n", udpbuffer);
perror("write()");
close(fd);
return NULL;
}
close(fd);
}
// send back client's message that came in udpbuffer
sendto(sd, udpbuffer, bytes, 0, (struct sockaddr*)&addr, sizeof(addr));
/* call the command if user specified one, pass current filename as argument */
if(command != NULL) {
memset(buffer1, 0, sizeof(buffer1));
/* udpbuffer still contains the filename, pass it to the command as parameter */
snprintf(buffer1, sizeof(buffer1), "%s \"%s\"", command, udpbuffer);
DBG("calling command %s", buffer1);
/* in addition provide the filename as environment variable */
if((rc = setenv("MJPG_FILE", udpbuffer, 1)) != 0) {
LOG("setenv failed (return value %d)\n", rc);
}
/* execute the command now */
if((rc = system(buffer1)) != 0) {
LOG("command failed (return value %d)\n", rc);
}
}
/* if specified, wait now */
if(delay > 0) {
usleep(1000 * delay);
}
}
// close UDP port
if(port > 0)
close(sd);
/* cleanup now */
pthread_cleanup_pop(1);
return NULL;
}
/*** plugin interface functions ***/
/******************************************************************************
Description.: this function is called first, in order to initialise
this plugin and pass a parameter string
Input Value.: parameters
Return Value: 0 if everything is ok, non-zero otherwise
******************************************************************************/
int output_init(output_parameter *param)
{
int i;
delay = 0;
param->argv[0] = OUTPUT_PLUGIN_NAME;
/* show all parameters for DBG purposes */
for(i = 0; i < param->argc; i++) {
DBG("argv[%d]=%s\n", i, param->argv[i]);
}
reset_getopt();
while(1) {
int option_index = 0, c = 0;
static struct option long_options[] = {
{"h", no_argument, 0, 0
},
{"help", no_argument, 0, 0},
{"f", required_argument, 0, 0},
{"folder", required_argument, 0, 0},
{"d", required_argument, 0, 0},
{"delay", required_argument, 0, 0},
{"c", required_argument, 0, 0},
{"command", required_argument, 0, 0},
{"p", required_argument, 0, 0},
{"port", required_argument, 0, 0},
{"i", required_argument, 0, 0},
{"input", required_argument, 0, 0},
{0, 0, 0, 0}
};
c = getopt_long_only(param->argc, param->argv, "", long_options, &option_index);
/* no more options to parse */
if(c == -1) break;
/* unrecognized option */
if(c == '?') {
help();
return 1;
}
switch(option_index) {
/* h, help */
case 0:
case 1:
DBG("case 0,1\n");
help();
return 1;
break;
/* f, folder */
case 2:
case 3:
DBG("case 2,3\n");
folder = malloc(strlen(optarg) + 1);
strcpy(folder, optarg);
if(folder[strlen(folder)-1] == '/')
folder[strlen(folder)-1] = '\0';
break;
/* d, delay */
case 4:
case 5:
DBG("case 4,5\n");
delay = atoi(optarg);
break;
/* c, command */
case 6:
case 7:
DBG("case 6,7\n");
command = strdup(optarg);
break;
/* p, port */
case 8:
case 9:
DBG("case 8,9\n");
port = atoi(optarg);
break;
/* i, input */
case 10:
case 11:
DBG("case 10,11\n");
input_number = atoi(optarg);
break;
}
}
pglobal = param->global;
if(!(input_number < pglobal->incnt)) {
OPRINT("ERROR: the %d input_plugin number is too much only %d plugins loaded\n", input_number, pglobal->incnt);
return 1;
}
OPRINT("input plugin.....: %d: %s\n", input_number, pglobal->in[input_number].plugin);
OPRINT("output folder.....: %s\n", folder);
OPRINT("delay after save..: %d\n", delay);
OPRINT("command...........: %s\n", (command == NULL) ? "disabled" : command);
if(port > 0) {
OPRINT("UDP port..........: %d\n", port);
} else {
OPRINT("UDP port..........: %s\n", "disabled");
}
return 0;
}
/******************************************************************************
Description.: calling this function stops the worker thread
Input Value.: -
Return Value: always 0
******************************************************************************/
int output_stop(int id)
{
DBG("will cancel worker thread\n");
pthread_cancel(worker);
return 0;
}
/******************************************************************************
Description.: calling this function creates and starts the worker thread
Input Value.: -
Return Value: always 0
******************************************************************************/
int output_run(int id)
{
DBG("launching worker thread\n");
pthread_create(&worker, 0, worker_thread, NULL);
pthread_detach(worker);
return 0;
}
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