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options_parsing.c
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options_parsing.c
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/*
* Copyright (c) 2014 Stoian Ivanov
* Copyright (c) 2009 Chase Douglas
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/**********************************************************************************
* This code is part of HTTP-Live-Video-Stream-Segmenter-and-Distributor
* look for newer versions at github.com
**********************************************************************************/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <errno.h>
#include <ctype.h>
#include "segmenter.h"
//Type of options detected
typedef enum {
INPUT_FILE, OUTPUT_FILE, OUTPUT_DIR, OUTPUT_BASE_NAME,SEGMENT_LENGTH, LIST_LENGTH,
QUIET,PERSISTENT, VERSION, PRINT_USAGE,
NO_MORE_OPTIONS,INVALID
} inputOption;
void printBanner() {
static int bannerPrinted= 1;
if (bannerPrinted==1) {
bannerPrinted++;
fprintf(stderr,"Segmenter for HTTP Live Streaming v" PROGRAM_VERSION "\n");
fprintf(stderr,"part of HTTP-Live-Video-Stream-Segmenter-and-Distributor @ github\n\n");
}
}
void printUsage_short(int shortonly){
printBanner();
if (shortonly) fprintf(stderr, "\n");
fprintf(stderr, "Usage: segmenter -i infile [-d baseDir] [-f baseFileName] [-o playListFile.m3u8] [-l <sec>] [-m maxlist] [-q] [-h] \n");
if (shortonly) fprintf(stderr, " segmenter -h for full help\n");
}
void printUsage() {
printUsage_short(0);
fprintf(stderr, "\nOptions (you can use -- or - for short option prefix e.g. -i == --i): \n"
"-i <infile>\t\tInput file. Required. - is translated to 'pipe:' before handling to libav \n"
"-o <outfile>\t\tPlaylist file to create. Default is <infile>.m3u8 \n"
"-d <basedir>\t\tThe base directory for files. Default is '.'\n"
"-f <baseFileName>\tSegment files will be named <baseFileName>-#. Default is <outfile>\n"
"-l <segment length>\tThe length of each segment. Default is 5\n"
"-m <maximal list length>\tThe length of produced list. Default is - no limit. \"Hard\" limit at %u\n"
"\t\t\t -m a will enable archive mode\n"
"-p \tenable persistent reconnect to source\n"
"--version\t\tPrint version details and exit.\n"
"-q,--quiet\t\tTry to be more quiet.\n"
"-h,--help\t\tPrint this info.\n"
"\n\n",MAX_SEGMENTS);
}
inputOption getNextOption(int argc, const char * argv[], char * option, int *optioni) {
static int optionIndex = 1;
if (optionIndex >= argc)
return NO_MORE_OPTIONS;
int hasnext=(optionIndex<argc-1);
if (strcmp(argv[optionIndex],"-i")==0 || strcmp(argv[optionIndex],"--i")==0) {
if (!hasnext){
fprintf(stderr,"ERROR: input filename must be given after -i\n");
return INVALID;
}
strncpy(option, argv[++optionIndex], MAX_FILENAME_LENGTH );
//check for valid file name
if (!isalpha(option[0]) && !isdigit(option[0]) && option[0] != '-' && option[0] != '/' && option[0] != '.') {
fprintf(stderr,"ERROR: input filename must start with alpha, digit, / or . \n");
return INVALID;
}
if (option[0]=='-' && option[1]==0) {
option[0]='p';
option[1]='i';
option[2]='p';
option[3]='e';
option[4]=':';
option[5]=0;
}
optionIndex++;
return INPUT_FILE;
}
if (strcmp(argv[optionIndex],"-o")==0 || strcmp(argv[optionIndex],"--o")==0) {
if (!hasnext){
fprintf(stderr,"ERROR: output filename must be given after -o\n");
return INVALID;
}
strncpy(option, argv[++optionIndex], MAX_FILENAME_LENGTH - 1);
//check for valid file name
if (!isalpha(option[0]) && !isdigit(option[0]) && option[0] != '-' && option[0] != '/' && option[0] != '.') {
fprintf(stderr,"ERROR: output filename must start with alpha, digit, / or . \n");
return INVALID;
}
if (option[0] != '-' && strncmp(option + (strlen(option) - 5), ".m3u8", 5) != 0) {
fprintf(stderr,"WARN: output file extension should be .m3u8\n\n");
//return INVALID;
}
optionIndex++;
return OUTPUT_FILE;
}
if (strcmp(argv[optionIndex],"-d")==0 || strcmp(argv[optionIndex],"--d")==0) {
if (!hasnext){
fprintf(stderr,"ERROR: output directory must be given after -d\n");
return INVALID;
}
strncpy(option, argv[++optionIndex], MAX_FILENAME_LENGTH );
//make sure it does not end in a slash
int l = strnlen(option,MAX_FILENAME_LENGTH - 1);
if (option[l - 1] == '/') {
option[l - 1] = 0;
}
//check for valid file name
if (!isalpha(option[0]) && !isdigit(option[0]) && option[0] != '-' && option[0] != '/' && option[0] != '.') {
fprintf(stderr,"ERROR: output directory must start with alpha, digit, / or . \n");
return INVALID;
}
optionIndex++;
return OUTPUT_DIR;
}
if (strcmp(argv[optionIndex],"-f")==0 || strcmp(argv[optionIndex],"--f")==0) {
if (!hasnext){
fprintf(stderr,"ERROR: output base filename must be given after -f\n");
return INVALID;
}
strncpy(option, argv[++optionIndex], MAX_FILENAME_LENGTH );
//check for valid file name
if (!isalpha(option[0]) && !isdigit(option[0]) && option[0] != '-' && option[0] != '/' && option[0] != '.') {
fprintf(stderr,"ERROR: output base filename must start with alpha, digit, / or . \n");
return INVALID;
}
optionIndex++;
return OUTPUT_BASE_NAME;
}
if (strcmp(argv[optionIndex],"-q")==0 || strcmp(argv[optionIndex],"--q" )==0|| strcmp(argv[optionIndex],"--quiet")==0) {
optionIndex++;
return QUIET;
}
if (strcmp(argv[optionIndex],"-p")==0 || strcmp(argv[optionIndex],"--p" )==0|| strcmp(argv[optionIndex],"--persistent")==0) {
optionIndex++;
return PERSISTENT;
}
if (strcmp(argv[optionIndex],"-l")==0 || strcmp(argv[optionIndex],"--l")==0) {
if (!hasnext){
fprintf(stderr,"ERROR: length must be given after -l\n");
return INVALID;
}
strncpy(option, argv[++optionIndex], MAX_FILENAME_LENGTH );
option[MAX_FILENAME_LENGTH - 1] = 0;
int a = strtol(option, NULL, 10);
if (a == 0 && errno != 0) {
fprintf(stderr,"ERROR: length must be an integer.\n");
return INVALID;
}
if (a <= 2) {
fprintf(stderr, "ERROR: Segment duration time must be > 2.\n");
return INVALID;
}
if (optioni) *optioni=a;
optionIndex++;
return SEGMENT_LENGTH;
}
if (strcmp(argv[optionIndex],"-m")==0 || strcmp(argv[optionIndex],"--m")==0) {
if (!hasnext){
fprintf(stderr,"ERROR: length must be given after -m\n");
return INVALID;
}
strncpy(option, argv[++optionIndex], MAX_FILENAME_LENGTH );
option[MAX_FILENAME_LENGTH - 1] = 0;
if (strcmp(option,"a")==0 || strcmp(option,"archive")==0) {
optionIndex++;
if (optioni) *optioni=-1;
return LIST_LENGTH;
}
int a = strtol(option, NULL, 10);
if (a == 0 && errno != 0) {
fprintf(stderr,"ERROR: list length must be an integer.\n");
return INVALID;
}
if (a <= 3) {
fprintf(stderr, "ERROR: list list must be > 3.\n");
return INVALID;
}
if (optioni) *optioni=a;
optionIndex++;
return LIST_LENGTH;
}
if (strcmp(argv[optionIndex],"--version")==0 ) {
optionIndex++;
return VERSION;
}
if (strcmp(argv[optionIndex],"-h")==0 || strcmp(argv[optionIndex],"--help")==0) {
optionIndex++;
return PRINT_USAGE;
}
fprintf(stderr, "ERROR: Unknown option %s\n",argv[optionIndex]);
return INVALID;
}
#define INPUT_FILE_INDEX 0
#define OUTPUT_FILE_INDEX 1
#define OUTPUT_BASE_NAME_INDEX 2
//assumes that the pointers have allocated memory
int parseCommandLine(
int argc, const char * argv[],
char * inputFile, char * outputFile, char * baseDir, char * baseName, char * baseExtension, int * segmentLength, int *listlen,
int * quiet, int * version, int * usage, int *persistent
) {
printBanner();
int requiredOptions[3] = {0, 0, 0};
inputOption result;
char option[MAX_FILENAME_LENGTH];
int optioni;
//default video and audio output
*quiet = 0;
*version = 0;
*usage = 0;
*persistent=0;
*segmentLength=5;
strncpy(baseExtension, ".ts",MAXT_EXT_LENGTH);
baseDir[0]='.';baseDir[1]=0;
*listlen=-1;
while (1) {
result = getNextOption(argc, argv, option,&optioni);
switch (result) {
case INPUT_FILE:
strncpy(inputFile, option, MAX_FILENAME_LENGTH);
requiredOptions[INPUT_FILE_INDEX] = 1;
break;
case OUTPUT_FILE:
strncpy(outputFile, option, MAX_FILENAME_LENGTH);
requiredOptions[OUTPUT_FILE_INDEX] = 1;
break;
case OUTPUT_DIR:
strncpy(baseDir, option, MAX_FILENAME_LENGTH);
break;
case OUTPUT_BASE_NAME:
strncpy(baseName, option, MAX_FILENAME_LENGTH);
requiredOptions[OUTPUT_BASE_NAME_INDEX] = 1;
break;
case SEGMENT_LENGTH:
*segmentLength = optioni;
case LIST_LENGTH:
*listlen = optioni;
case QUIET:
*quiet = 1;
break;
case PERSISTENT:
*persistent = 1;
break;
case VERSION:
*version = 1;
break;
case PRINT_USAGE:
*usage = 1;
break;
case NO_MORE_OPTIONS:
{
if (argc==1) *usage=1;
if (*version == 1 || *usage == 1)
return 0;
int missing = 0;
if (requiredOptions[INPUT_FILE_INDEX] == 0) {
fprintf(stderr, "ERROR: Missing required option --i for input file.\n");
missing = 1;
return -1;
}
if (requiredOptions[OUTPUT_FILE_INDEX] == 0) {
char *from=inputFile,*to=outputFile,*lastd=NULL,cc,*rebase=NULL;
while ((cc=*from)) {
from++;
*to=cc;
if (cc=='.') lastd=to;
to++;
if (cc=='/') rebase=to;
}
*to=0;
if (!lastd) lastd=to;
if (lastd-outputFile<MAX_FILENAME_LENGTH-5){
if (*lastd!='.') *lastd='.';
lastd[1]='m';
lastd[2]='3';
lastd[3]='u';
lastd[4]='8';
lastd[5]=0;
}
if (rebase && *rebase!=0){
to=outputFile;
while (*rebase!=0){
*to=*rebase;
rebase++;to++;
}
*to=0;
}
}
if (requiredOptions[OUTPUT_BASE_NAME_INDEX] == 0) {
char *from=outputFile,*to=baseName,*lastd=NULL,cc;
while ((cc=*from)) {
from++;
*to=cc;
if (cc=='.') lastd=to;
to++;
}
*to=0;
if (!lastd) {
lastd=to;
lastd[0]='-';
lastd[1]='p';
lastd[2]='0';
} else lastd[0]=0;
}
if (missing == 1) {
printUsage_short(1);
return -1;
}
return 0;
}
case INVALID:
default:
return -1;
}
}
return 0;
}