422 lines
15 KiB
C
422 lines
15 KiB
C
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/*******************************************************************************
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# #
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# MJPG-streamer allows to stream JPG frames from an input-plugin #
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# to several output plugins #
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# #
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# Copyright (C) 2007 Tom Stöveken #
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# #
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# This program is free software; you can redistribute it and/or modify #
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# it under the terms of the GNU General Public License as published by #
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# the Free Software Foundation; version 2 of the License. #
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# #
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# This program 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 #
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# GNU General Public License for more details. #
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# #
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# You should have received a copy of the GNU General Public License #
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# along with this program; if not, write to the Free Software #
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA #
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# #
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*******************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <signal.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <getopt.h>
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#include <pthread.h>
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#include <dlfcn.h>
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#include <fcntl.h>
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#include <syslog.h>
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#include <linux/types.h> /* for videodev2.h */
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#include <linux/videodev2.h>
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#include "utils.h"
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#include "mjpg_streamer.h"
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/* globals */
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static globals global;
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/******************************************************************************
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Description.: Display a help message
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Input Value.: argv[0] is the program name and the parameter progname
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Return Value: -
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******************************************************************************/
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static void help(char *progname)
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{
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fprintf(stderr, "-----------------------------------------------------------------------\n");
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fprintf(stderr, "Usage: %s\n" \
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" -i | --input \"<input-plugin.so> [parameters]\"\n" \
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" -o | --output \"<output-plugin.so> [parameters]\"\n" \
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" [-h | --help ]........: display this help\n" \
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" [-v | --version ].....: display version information\n" \
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" [-b | --background]...: fork to the background, daemon mode\n", progname);
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fprintf(stderr, "-----------------------------------------------------------------------\n");
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fprintf(stderr, "Example #1:\n" \
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" To open an UVC webcam \"/dev/video1\" and stream it via HTTP:\n" \
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" %s -i \"input_uvc.so -d /dev/video1\" -o \"output_http.so\"\n", progname);
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fprintf(stderr, "-----------------------------------------------------------------------\n");
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fprintf(stderr, "Example #2:\n" \
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" To open an UVC webcam and stream via HTTP port 8090:\n" \
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" %s -i \"input_uvc.so\" -o \"output_http.so -p 8090\"\n", progname);
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fprintf(stderr, "-----------------------------------------------------------------------\n");
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fprintf(stderr, "Example #3:\n" \
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" To get help for a certain input plugin:\n" \
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" %s -i \"input_uvc.so --help\"\n", progname);
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fprintf(stderr, "-----------------------------------------------------------------------\n");
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fprintf(stderr, "In case the modules (=plugins) can not be found:\n" \
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" * Set the default search path for the modules with:\n" \
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" export LD_LIBRARY_PATH=/path/to/plugins,\n" \
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" * or put the plugins into the \"/lib/\" or \"/usr/lib\" folder,\n" \
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" * or instead of just providing the plugin file name, use a complete\n" \
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" path and filename:\n" \
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" %s -i \"/path/to/modules/input_uvc.so\"\n", progname);
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fprintf(stderr, "-----------------------------------------------------------------------\n");
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}
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/******************************************************************************
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Description.: pressing CTRL+C sends signals to this process instead of just
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killing it plugins can tidily shutdown and free allocated
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resources. The function prototype is defined by the system,
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because it is a callback function.
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Input Value.: sig tells us which signal was received
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Return Value: -
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******************************************************************************/
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static void signal_handler(int sig)
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{
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int i;
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/* signal "stop" to threads */
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LOG("setting signal to stop\n");
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global.stop = 1;
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usleep(1000 * 1000);
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/* clean up threads */
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LOG("force cancellation of threads and cleanup resources\n");
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for(i = 0; i < global.incnt; i++) {
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global.in[i].stop(i);
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/*for (j = 0; j<MAX_PLUGIN_ARGUMENTS; j++) {
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if (global.in[i].param.argv[j] != NULL) {
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free(global.in[i].param.argv[j]);
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}
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}*/
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}
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for(i = 0; i < global.outcnt; i++) {
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global.out[i].stop(global.out[i].param.id);
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pthread_cond_destroy(&global.in[i].db_update);
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pthread_mutex_destroy(&global.in[i].db);
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/*for (j = 0; j<MAX_PLUGIN_ARGUMENTS; j++) {
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if (global.out[i].param.argv[j] != NULL)
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free(global.out[i].param.argv[j]);
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}*/
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}
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usleep(1000 * 1000);
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/* close handles of input plugins */
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for(i = 0; i < global.incnt; i++) {
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dlclose(global.in[i].handle);
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}
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for(i = 0; i < global.outcnt; i++) {
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int j, skip = 0;
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DBG("about to decrement usage counter for handle of %s, id #%02d, handle: %p\n", \
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global.out[i].plugin, global.out[i].param.id, global.out[i].handle);
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for(j=i+1; j<global.outcnt; j++) {
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if ( global.out[i].handle == global.out[j].handle ) {
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DBG("handles are pointing to the same destination (%p == %p)\n", global.out[i].handle, global.out[j].handle);
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skip = 1;
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}
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}
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if ( skip ) {
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continue;
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}
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DBG("closing handle %p\n", global.out[i].handle);
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dlclose(global.out[i].handle);
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}
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DBG("all plugin handles closed\n");
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LOG("done\n");
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closelog();
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exit(0);
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return;
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}
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static int split_parameters(char *parameter_string, int *argc, char **argv)
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{
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int count = 1;
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argv[0] = NULL; // the plugin may set it to 'INPUT_PLUGIN_NAME'
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if(parameter_string != NULL && strlen(parameter_string) != 0) {
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char *arg = NULL, *saveptr = NULL, *token = NULL;
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arg = strdup(parameter_string);
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if(strchr(arg, ' ') != NULL) {
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token = strtok_r(arg, " ", &saveptr);
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if(token != NULL) {
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argv[count] = strdup(token);
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count++;
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while((token = strtok_r(NULL, " ", &saveptr)) != NULL) {
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argv[count] = strdup(token);
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count++;
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if(count >= MAX_PLUGIN_ARGUMENTS) {
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IPRINT("ERROR: too many arguments to input plugin\n");
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return 0;
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}
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}
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}
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}
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free(arg);
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}
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*argc = count;
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return 1;
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}
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/******************************************************************************
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Description.:
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Input Value.:
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Return Value:
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******************************************************************************/
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int main(int argc, char *argv[])
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{
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//char *input = "input_uvc.so --resolution 640x480 --fps 5 --device /dev/video0";
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char *input[MAX_INPUT_PLUGINS];
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char *output[MAX_OUTPUT_PLUGINS];
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int daemon = 0, i, j;
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size_t tmp = 0;
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output[0] = "output_http.so --port 8080";
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global.outcnt = 0;
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global.incnt = 0;
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/* parameter parsing */
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while(1) {
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int c = 0;
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static struct option long_options[] = {
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{"help", no_argument, NULL, 'h'},
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{"input", required_argument, NULL, 'i'},
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{"output", required_argument, NULL, 'o'},
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{"version", no_argument, NULL, 'v'},
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{"background", no_argument, NULL, 'b'},
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{NULL, 0, NULL, 0}
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};
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c = getopt_long(argc, argv, "hi:o:vb", long_options, NULL);
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/* no more options to parse */
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if(c == -1) break;
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switch(c) {
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case 'i':
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input[global.incnt++] = strdup(optarg);
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break;
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case 'o':
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output[global.outcnt++] = strdup(optarg);
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break;
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case 'v':
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printf("MJPG Streamer Version: %s\n",
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#ifdef GIT_HASH
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GIT_HASH
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#else
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SOURCE_VERSION
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#endif
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);
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return 0;
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break;
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case 'b':
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daemon = 1;
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break;
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case 'h': /* fall through */
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default:
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help(argv[0]);
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exit(EXIT_FAILURE);
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}
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}
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openlog("MJPG-streamer ", LOG_PID | LOG_CONS, LOG_USER);
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//openlog("MJPG-streamer ", LOG_PID|LOG_CONS|LOG_PERROR, LOG_USER);
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syslog(LOG_INFO, "starting application");
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/* fork to the background */
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if(daemon) {
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LOG("enabling daemon mode");
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daemon_mode();
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}
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/* ignore SIGPIPE (send by OS if transmitting to closed TCP sockets) */
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signal(SIGPIPE, SIG_IGN);
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/* register signal handler for <CTRL>+C in order to clean up */
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if(signal(SIGINT, signal_handler) == SIG_ERR) {
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LOG("could not register signal handler\n");
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closelog();
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exit(EXIT_FAILURE);
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}
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/*
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* messages like the following will only be visible on your terminal
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* if not running in daemon mode
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*/
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#ifdef GIT_HASH
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LOG("MJPG Streamer Version: git rev: %s\n", GIT_HASH);
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#else
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LOG("MJPG Streamer Version.: %s\n", SOURCE_VERSION);
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#endif
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/* check if at least one output plugin was selected */
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if(global.outcnt == 0) {
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/* no? Then use the default plugin instead */
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global.outcnt = 1;
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}
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/* open input plugin */
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for(i = 0; i < global.incnt; i++) {
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/* this mutex and the conditional variable are used to synchronize access to the global picture buffer */
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if(pthread_mutex_init(&global.in[i].db, NULL) != 0) {
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LOG("could not initialize mutex variable\n");
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closelog();
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exit(EXIT_FAILURE);
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}
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if(pthread_cond_init(&global.in[i].db_update, NULL) != 0) {
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LOG("could not initialize condition variable\n");
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closelog();
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exit(EXIT_FAILURE);
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}
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tmp = (size_t)(strchr(input[i], ' ') - input[i]);
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global.in[i].stop = 0;
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global.in[i].context = NULL;
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global.in[i].buf = NULL;
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global.in[i].size = 0;
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global.in[i].plugin = (tmp > 0) ? strndup(input[i], tmp) : strdup(input[i]);
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global.in[i].handle = dlopen(global.in[i].plugin, RTLD_LAZY);
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if(!global.in[i].handle) {
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LOG("ERROR: could not find input plugin\n");
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LOG(" Perhaps you want to adjust the search path with:\n");
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LOG(" # export LD_LIBRARY_PATH=/path/to/plugin/folder\n");
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LOG(" dlopen: %s\n", dlerror());
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closelog();
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exit(EXIT_FAILURE);
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}
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global.in[i].init = dlsym(global.in[i].handle, "input_init");
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if(global.in[i].init == NULL) {
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LOG("%s\n", dlerror());
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exit(EXIT_FAILURE);
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}
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global.in[i].stop = dlsym(global.in[i].handle, "input_stop");
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if(global.in[i].stop == NULL) {
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LOG("%s\n", dlerror());
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exit(EXIT_FAILURE);
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}
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global.in[i].run = dlsym(global.in[i].handle, "input_run");
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if(global.in[i].run == NULL) {
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LOG("%s\n", dlerror());
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exit(EXIT_FAILURE);
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}
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/* try to find optional command */
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global.in[i].cmd = dlsym(global.in[i].handle, "input_cmd");
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global.in[i].param.parameters = strchr(input[i], ' ');
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for (j = 0; j<MAX_PLUGIN_ARGUMENTS; j++) {
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global.in[i].param.argv[j] = NULL;
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}
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split_parameters(global.in[i].param.parameters, &global.in[i].param.argc, global.in[i].param.argv);
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global.in[i].param.global = &global;
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global.in[i].param.id = i;
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if(global.in[i].init(&global.in[i].param, i)) {
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LOG("input_init() return value signals to exit\n");
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closelog();
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exit(0);
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}
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}
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/* open output plugin */
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for(i = 0; i < global.outcnt; i++) {
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tmp = (size_t)(strchr(output[i], ' ') - output[i]);
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global.out[i].plugin = (tmp > 0) ? strndup(output[i], tmp) : strdup(output[i]);
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global.out[i].handle = dlopen(global.out[i].plugin, RTLD_LAZY);
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if(!global.out[i].handle) {
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|
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LOG("ERROR: could not find output plugin %s\n", global.out[i].plugin);
|
||
|
|
LOG(" Perhaps you want to adjust the search path with:\n");
|
||
|
|
LOG(" # export LD_LIBRARY_PATH=/path/to/plugin/folder\n");
|
||
|
|
LOG(" dlopen: %s\n", dlerror());
|
||
|
|
closelog();
|
||
|
|
exit(EXIT_FAILURE);
|
||
|
|
}
|
||
|
|
global.out[i].init = dlsym(global.out[i].handle, "output_init");
|
||
|
|
if(global.out[i].init == NULL) {
|
||
|
|
LOG("%s\n", dlerror());
|
||
|
|
exit(EXIT_FAILURE);
|
||
|
|
}
|
||
|
|
global.out[i].stop = dlsym(global.out[i].handle, "output_stop");
|
||
|
|
if(global.out[i].stop == NULL) {
|
||
|
|
LOG("%s\n", dlerror());
|
||
|
|
exit(EXIT_FAILURE);
|
||
|
|
}
|
||
|
|
global.out[i].run = dlsym(global.out[i].handle, "output_run");
|
||
|
|
if(global.out[i].run == NULL) {
|
||
|
|
LOG("%s\n", dlerror());
|
||
|
|
exit(EXIT_FAILURE);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* try to find optional command */
|
||
|
|
global.out[i].cmd = dlsym(global.out[i].handle, "output_cmd");
|
||
|
|
|
||
|
|
global.out[i].param.parameters = strchr(output[i], ' ');
|
||
|
|
|
||
|
|
for (j = 0; j<MAX_PLUGIN_ARGUMENTS; j++) {
|
||
|
|
global.out[i].param.argv[j] = NULL;
|
||
|
|
}
|
||
|
|
split_parameters(global.out[i].param.parameters, &global.out[i].param.argc, global.out[i].param.argv);
|
||
|
|
|
||
|
|
global.out[i].param.global = &global;
|
||
|
|
global.out[i].param.id = i;
|
||
|
|
if(global.out[i].init(&global.out[i].param, i)) {
|
||
|
|
LOG("output_init() return value signals to exit\n");
|
||
|
|
closelog();
|
||
|
|
exit(EXIT_FAILURE);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* start to read the input, push pictures into global buffer */
|
||
|
|
DBG("starting %d input plugin\n", global.incnt);
|
||
|
|
for(i = 0; i < global.incnt; i++) {
|
||
|
|
syslog(LOG_INFO, "starting input plugin %s", global.in[i].plugin);
|
||
|
|
if(global.in[i].run(i)) {
|
||
|
|
LOG("can not run input plugin %d: %s\n", i, global.in[i].plugin);
|
||
|
|
closelog();
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
DBG("starting %d output plugin(s)\n", global.outcnt);
|
||
|
|
for(i = 0; i < global.outcnt; i++) {
|
||
|
|
syslog(LOG_INFO, "starting output plugin: %s (ID: %02d)", global.out[i].plugin, global.out[i].param.id);
|
||
|
|
global.out[i].run(global.out[i].param.id);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* wait for signals */
|
||
|
|
pause();
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|