www.pudn.com > ffmpeg_src2007.rar > cmdutils.c

/* 
 * Various utilities for command line tools 
 * Copyright (c) 2000-2003 Fabrice Bellard 
 * 
 * This library is free software; you can redistribute it and/or 
 * modify it under the terms of the GNU Lesser General Public 
 * License as published by the Free Software Foundation; either 
 * version 2 of the License, or (at your option) any later version. 
 * 
 * This library 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 
 * Lesser General Public License for more details. 
 * 
 * You should have received a copy of the GNU Lesser General Public 
 * License along with this library; if not, write to the Free Software 
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 
 */ 
#define HAVE_AV_CONFIG_H 
#include "avformat.h" 
#include "common.h" 
 
#include "cmdutils.h" 
 
void show_help_options(const OptionDef *options, const char *msg, int mask, int value) 
{ 
    const OptionDef *po; 
    int first; 
 
    first = 1; 
    for(po = options; po->name != NULL; po++) { 
        char buf[64]; 
        if ((po->flags & mask) == value) { 
            if (first) { 
                printf("%s", msg); 
                first = 0; 
            } 
            pstrcpy(buf, sizeof(buf), po->name); 
            if (po->flags & HAS_ARG) { 
                pstrcat(buf, sizeof(buf), " "); 
                pstrcat(buf, sizeof(buf), po->argname); 
            } 
            printf("-%-17s  %s\n", buf, po->help); 
        } 
    } 
} 
 
static const OptionDef* find_option(const OptionDef *po, const char *name){ 
    while (po->name != NULL) { 
        if (!strcmp(name, po->name)) 
            break; 
        po++; 
    } 
    return po; 
} 
 
void parse_options(int argc, char **argv, const OptionDef *options) 
{ 
    const char *opt, *arg; 
    int optindex; 
    const OptionDef *po; 
 
    /* parse options */ 
    optindex = 1; 
    while (optindex < argc) { 
        opt = argv[optindex++]; 
 
        if (opt[0] == '-' && opt[1] != '\0') { 
            po= find_option(options, opt + 1); 
            if (!po->name) 
                po= find_option(options, "default"); 
            if (!po->name) { 
unknown_opt: 
                fprintf(stderr, "%s: unrecognized option '%s'\n", argv[0], opt); 
                exit(1); 
            } 
            arg = NULL; 
            if (po->flags & HAS_ARG) { 
                arg = argv[optindex++]; 
                if (!arg) { 
                    fprintf(stderr, "%s: missing argument for option '%s'\n", argv[0], opt); 
                    exit(1); 
                } 
            } 
            if (po->flags & OPT_STRING) { 
                char *str; 
                str = av_strdup(arg); 
                *po->u.str_arg = str; 
            } else if (po->flags & OPT_BOOL) { 
                *po->u.int_arg = 1; 
            } else if (po->flags & OPT_INT) { 
                *po->u.int_arg = atoi(arg); 
            } else if (po->flags & OPT_FLOAT) { 
                *po->u.float_arg = atof(arg); 
            } else if (po->flags & OPT_FUNC2) { 
                if(po->u.func2_arg(opt+1, arg)<0) 
                    goto unknown_opt; 
            } else { 
                po->u.func_arg(arg); 
            } 
        } else { 
            parse_arg_file(opt); 
        } 
    } 
} 
 
void print_error(const char *filename, int err) 
{ 
    switch(err) { 
    case AVERROR_NUMEXPECTED: 
        fprintf(stderr, "%s: Incorrect image filename syntax.\n" 
                "Use '%%d' to specify the image number:\n" 
                "  for img1.jpg, img2.jpg, ..., use 'img%%d.jpg';\n" 
                "  for img001.jpg, img002.jpg, ..., use 'img%%03d.jpg'.\n", 
                filename); 
        break; 
    case AVERROR_INVALIDDATA: 
        fprintf(stderr, "%s: Error while parsing header\n", filename); 
        break; 
    case AVERROR_NOFMT: 
        fprintf(stderr, "%s: Unknown format\n", filename); 
        break; 
    case AVERROR_IO: 
        fprintf(stderr, "%s: I/O error occured\n" 
                "Usually that means that input file is truncated and/or corrupted.\n", 
                filename); 
        break; 
    case AVERROR_NOMEM: 
        fprintf(stderr, "%s: memory allocation error occured\n", filename); 
        break; 
    default: 
        fprintf(stderr, "%s: Error while opening file\n", filename); 
        break; 
    } 
}