cmdutils.c 52.9 KB
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/*
 * Various utilities for command line tools
 * Copyright (c) 2000-2003 Fabrice Bellard
 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * 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
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include <string.h>
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#include <stdint.h>
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#include <stdlib.h>
#include <errno.h>
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#include <math.h>
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/* Include only the enabled headers since some compilers (namely, Sun
   Studio) will not omit unused inline functions and create undefined
   references to libraries that are not being built. */

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#include "config.h"
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#include "libavformat/avformat.h"
#include "libavfilter/avfilter.h"
#include "libavdevice/avdevice.h"
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#include "libavresample/avresample.h"
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#include "libswscale/swscale.h"
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#include "libavutil/avassert.h"
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#include "libavutil/avstring.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/eval.h"
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#include "libavutil/dict.h"
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#include "libavutil/opt.h"
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#include "libavutil/cpu.h"
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#include "cmdutils.h"
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#include "version.h"
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#if CONFIG_NETWORK
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#include "libavformat/network.h"
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#endif
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#if HAVE_SYS_RESOURCE_H
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#include <sys/time.h>
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#include <sys/resource.h>
#endif
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struct SwsContext *sws_opts;
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AVDictionary *format_opts, *codec_opts, *resample_opts;
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static const int this_year = 2014;
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void init_opts(void)
{
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#if CONFIG_SWSCALE
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    sws_opts = sws_getContext(16, 16, 0, 16, 16, 0, SWS_BICUBIC,
                              NULL, NULL, NULL);
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#endif
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}

void uninit_opts(void)
{
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#if CONFIG_SWSCALE
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    sws_freeContext(sws_opts);
    sws_opts = NULL;
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#endif
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    av_dict_free(&format_opts);
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    av_dict_free(&codec_opts);
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    av_dict_free(&resample_opts);
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}

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void log_callback_help(void *ptr, int level, const char *fmt, va_list vl)
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{
    vfprintf(stdout, fmt, vl);
}

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static void (*program_exit)(int ret);

void register_exit(void (*cb)(int ret))
{
    program_exit = cb;
}

void exit_program(int ret)
{
    if (program_exit)
        program_exit(ret);

    exit(ret);
}

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double parse_number_or_die(const char *context, const char *numstr, int type,
                           double min, double max)
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{
    char *tail;
    const char *error;
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    double d = av_strtod(numstr, &tail);
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    if (*tail)
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        error = "Expected number for %s but found: %s\n";
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    else if (d < min || d > max)
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        error = "The value for %s was %s which is not within %f - %f\n";
    else if (type == OPT_INT64 && (int64_t)d != d)
        error = "Expected int64 for %s but found %s\n";
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    else if (type == OPT_INT && (int)d != d)
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        error = "Expected int for %s but found %s\n";
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    else
        return d;
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    av_log(NULL, AV_LOG_FATAL, error, context, numstr, min, max);
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    exit_program(1);
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    return 0;
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}

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int64_t parse_time_or_die(const char *context, const char *timestr,
                          int is_duration)
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{
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    int64_t us;
    if (av_parse_time(&us, timestr, is_duration) < 0) {
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        av_log(NULL, AV_LOG_FATAL, "Invalid %s specification for %s: %s\n",
               is_duration ? "duration" : "date", context, timestr);
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        exit_program(1);
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    }
    return us;
}

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void show_help_options(const OptionDef *options, const char *msg, int req_flags,
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                       int rej_flags, int alt_flags)
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{
    const OptionDef *po;
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    int first;
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    first = 1;
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    for (po = options; po->name != NULL; po++) {
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        char buf[64];
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        if (((po->flags & req_flags) != req_flags) ||
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            (alt_flags && !(po->flags & alt_flags)) ||
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            (po->flags & rej_flags))
            continue;

        if (first) {
            printf("%s\n", msg);
            first = 0;
        }
        av_strlcpy(buf, po->name, sizeof(buf));
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        if (po->argname) {
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            av_strlcat(buf, " ", sizeof(buf));
            av_strlcat(buf, po->argname, sizeof(buf));
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        }
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        printf("-%-17s  %s\n", buf, po->help);
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    }
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    printf("\n");
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}

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void show_help_children(const AVClass *class, int flags)
{
    const AVClass *child = NULL;
    av_opt_show2(&class, NULL, flags, 0);
    printf("\n");

    while (child = av_opt_child_class_next(class, child))
        show_help_children(child, flags);
}

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static const OptionDef *find_option(const OptionDef *po, const char *name)
{
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    const char *p = strchr(name, ':');
    int len = p ? p - name : strlen(name);

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    while (po->name != NULL) {
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        if (!strncmp(name, po->name, len) && strlen(po->name) == len)
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            break;
        po++;
    }
    return po;
}

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/* _WIN32 means using the windows libc - cygwin doesn't define that
 * by default. HAVE_COMMANDLINETOARGVW is true on cygwin, while
 * it doesn't provide the actual command line via GetCommandLineW(). */
#if HAVE_COMMANDLINETOARGVW && defined(_WIN32)
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#include <windows.h>
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#include <shellapi.h>
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/* Will be leaked on exit */
static char** win32_argv_utf8 = NULL;
static int win32_argc = 0;

/**
 * Prepare command line arguments for executable.
 * For Windows - perform wide-char to UTF-8 conversion.
 * Input arguments should be main() function arguments.
 * @param argc_ptr Arguments number (including executable)
 * @param argv_ptr Arguments list.
 */
static void prepare_app_arguments(int *argc_ptr, char ***argv_ptr)
{
    char *argstr_flat;
    wchar_t **argv_w;
    int i, buffsize = 0, offset = 0;

    if (win32_argv_utf8) {
        *argc_ptr = win32_argc;
        *argv_ptr = win32_argv_utf8;
        return;
    }

    win32_argc = 0;
    argv_w = CommandLineToArgvW(GetCommandLineW(), &win32_argc);
    if (win32_argc <= 0 || !argv_w)
        return;

    /* determine the UTF-8 buffer size (including NULL-termination symbols) */
    for (i = 0; i < win32_argc; i++)
        buffsize += WideCharToMultiByte(CP_UTF8, 0, argv_w[i], -1,
                                        NULL, 0, NULL, NULL);

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    win32_argv_utf8 = av_mallocz(sizeof(char *) * (win32_argc + 1) + buffsize);
    argstr_flat     = (char *)win32_argv_utf8 + sizeof(char *) * (win32_argc + 1);
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    if (win32_argv_utf8 == NULL) {
        LocalFree(argv_w);
        return;
    }

    for (i = 0; i < win32_argc; i++) {
        win32_argv_utf8[i] = &argstr_flat[offset];
        offset += WideCharToMultiByte(CP_UTF8, 0, argv_w[i], -1,
                                      &argstr_flat[offset],
                                      buffsize - offset, NULL, NULL);
    }
    win32_argv_utf8[i] = NULL;
    LocalFree(argv_w);

    *argc_ptr = win32_argc;
    *argv_ptr = win32_argv_utf8;
}
#else
static inline void prepare_app_arguments(int *argc_ptr, char ***argv_ptr)
{
    /* nothing to do */
}
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#endif /* HAVE_COMMANDLINETOARGVW */
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static int write_option(void *optctx, const OptionDef *po, const char *opt,
                        const char *arg)
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{
    /* new-style options contain an offset into optctx, old-style address of
     * a global var*/
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    void *dst = po->flags & (OPT_OFFSET | OPT_SPEC) ?
                (uint8_t *)optctx + po->u.off : po->u.dst_ptr;
    int *dstcount;
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    if (po->flags & OPT_SPEC) {
        SpecifierOpt **so = dst;
        char *p = strchr(opt, ':');

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        dstcount = (int *)(so + 1);
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        *so = grow_array(*so, sizeof(**so), dstcount, *dstcount + 1);
        (*so)[*dstcount - 1].specifier = av_strdup(p ? p + 1 : "");
        dst = &(*so)[*dstcount - 1].u;
    }
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    if (po->flags & OPT_STRING) {
        char *str;
        str = av_strdup(arg);
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        av_freep(dst);
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        *(char **)dst = str;
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    } else if (po->flags & OPT_BOOL || po->flags & OPT_INT) {
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        *(int *)dst = parse_number_or_die(opt, arg, OPT_INT64, INT_MIN, INT_MAX);
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    } else if (po->flags & OPT_INT64) {
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        *(int64_t *)dst = parse_number_or_die(opt, arg, OPT_INT64, INT64_MIN, INT64_MAX);
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    } else if (po->flags & OPT_TIME) {
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        *(int64_t *)dst = parse_time_or_die(opt, arg, 1);
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    } else if (po->flags & OPT_FLOAT) {
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        *(float *)dst = parse_number_or_die(opt, arg, OPT_FLOAT, -INFINITY, INFINITY);
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    } else if (po->flags & OPT_DOUBLE) {
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        *(double *)dst = parse_number_or_die(opt, arg, OPT_DOUBLE, -INFINITY, INFINITY);
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    } else if (po->u.func_arg) {
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        int ret = po->u.func_arg(optctx, opt, arg);
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        if (ret < 0) {
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            av_log(NULL, AV_LOG_ERROR,
                   "Failed to set value '%s' for option '%s'\n", arg, opt);
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            return ret;
        }
    }
    if (po->flags & OPT_EXIT)
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        exit_program(0);
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    return 0;
}

int parse_option(void *optctx, const char *opt, const char *arg,
                 const OptionDef *options)
{
    const OptionDef *po;
    int ret;

    po = find_option(options, opt);
    if (!po->name && opt[0] == 'n' && opt[1] == 'o') {
        /* handle 'no' bool option */
        po = find_option(options, opt + 2);
        if ((po->name && (po->flags & OPT_BOOL)))
            arg = "0";
    } else if (po->flags & OPT_BOOL)
        arg = "1";

    if (!po->name)
        po = find_option(options, "default");
    if (!po->name) {
        av_log(NULL, AV_LOG_ERROR, "Unrecognized option '%s'\n", opt);
        return AVERROR(EINVAL);
    }
    if (po->flags & HAS_ARG && !arg) {
        av_log(NULL, AV_LOG_ERROR, "Missing argument for option '%s'\n", opt);
        return AVERROR(EINVAL);
    }

    ret = write_option(optctx, po, opt, arg);
    if (ret < 0)
        return ret;

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    return !!(po->flags & HAS_ARG);
}

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void parse_options(void *optctx, int argc, char **argv, const OptionDef *options,
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                   void (*parse_arg_function)(void *, const char*))
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{
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    const char *opt;
    int optindex, handleoptions = 1, ret;
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    /* perform system-dependent conversions for arguments list */
    prepare_app_arguments(&argc, &argv);

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    /* parse options */
    optindex = 1;
    while (optindex < argc) {
        opt = argv[optindex++];
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        if (handleoptions && opt[0] == '-' && opt[1] != '\0') {
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            if (opt[1] == '-' && opt[2] == '\0') {
                handleoptions = 0;
                continue;
            }
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            opt++;
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            if ((ret = parse_option(optctx, opt, argv[optindex], options)) < 0)
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                exit_program(1);
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            optindex += ret;
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        } else {
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            if (parse_arg_function)
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                parse_arg_function(optctx, opt);
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        }
    }
}

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int parse_optgroup(void *optctx, OptionGroup *g)
{
    int i, ret;

    av_log(NULL, AV_LOG_DEBUG, "Parsing a group of options: %s %s.\n",
           g->group_def->name, g->arg);

    for (i = 0; i < g->nb_opts; i++) {
        Option *o = &g->opts[i];

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        if (g->group_def->flags &&
            !(g->group_def->flags & o->opt->flags)) {
            av_log(NULL, AV_LOG_ERROR, "Option %s (%s) cannot be applied to "
                   "%s %s -- you are trying to apply an input option to an "
                   "output file or vice versa. Move this option before the "
                   "file it belongs to.\n", o->key, o->opt->help,
                   g->group_def->name, g->arg);
            return AVERROR(EINVAL);
        }

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        av_log(NULL, AV_LOG_DEBUG, "Applying option %s (%s) with argument %s.\n",
               o->key, o->opt->help, o->val);

        ret = write_option(optctx, o->opt, o->key, o->val);
        if (ret < 0)
            return ret;
    }

    av_log(NULL, AV_LOG_DEBUG, "Successfully parsed a group of options.\n");

    return 0;
}

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int locate_option(int argc, char **argv, const OptionDef *options,
                  const char *optname)
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{
    const OptionDef *po;
    int i;

    for (i = 1; i < argc; i++) {
        const char *cur_opt = argv[i];

        if (*cur_opt++ != '-')
            continue;

        po = find_option(options, cur_opt);
        if (!po->name && cur_opt[0] == 'n' && cur_opt[1] == 'o')
            po = find_option(options, cur_opt + 2);

        if ((!po->name && !strcmp(cur_opt, optname)) ||
             (po->name && !strcmp(optname, po->name)))
            return i;

        if (!po || po->flags & HAS_ARG)
            i++;
    }
    return 0;
}

void parse_loglevel(int argc, char **argv, const OptionDef *options)
{
    int idx = locate_option(argc, argv, options, "loglevel");
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    if (!idx)
        idx = locate_option(argc, argv, options, "v");
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    if (idx && argv[idx + 1])
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        opt_loglevel(NULL, "loglevel", argv[idx + 1]);
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}

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#define FLAGS (o->type == AV_OPT_TYPE_FLAGS) ? AV_DICT_APPEND : 0
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int opt_default(void *optctx, const char *opt, const char *arg)
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{
    const AVOption *o;
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    char opt_stripped[128];
    const char *p;
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    const AVClass *cc = avcodec_get_class(), *fc = avformat_get_class();
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#if CONFIG_AVRESAMPLE
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    const AVClass *rc = avresample_get_class();
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#endif
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#if CONFIG_SWSCALE
    const AVClass *sc = sws_get_class();
#endif
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    if (!(p = strchr(opt, ':')))
        p = opt + strlen(opt);
    av_strlcpy(opt_stripped, opt, FFMIN(sizeof(opt_stripped), p - opt + 1));

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    if ((o = av_opt_find(&cc, opt_stripped, NULL, 0,
                         AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ)) ||
        ((opt[0] == 'v' || opt[0] == 'a' || opt[0] == 's') &&
         (o = av_opt_find(&cc, opt + 1, NULL, 0, AV_OPT_SEARCH_FAKE_OBJ))))
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        av_dict_set(&codec_opts, opt, arg, FLAGS);
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    else if ((o = av_opt_find(&fc, opt, NULL, 0,
                              AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ)))
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        av_dict_set(&format_opts, opt, arg, FLAGS);
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#if CONFIG_AVRESAMPLE
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    else if ((o = av_opt_find(&rc, opt, NULL, 0,
                              AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ)))
        av_dict_set(&resample_opts, opt, arg, FLAGS);
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#endif
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#if CONFIG_SWSCALE
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    else if ((o = av_opt_find(&sc, opt, NULL, 0,
                              AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ))) {
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        // XXX we only support sws_flags, not arbitrary sws options
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        int ret = av_opt_set(sws_opts, opt, arg, 0);
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        if (ret < 0) {
            av_log(NULL, AV_LOG_ERROR, "Error setting option %s.\n", opt);
            return ret;
        }
    }
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#endif
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    if (o)
        return 0;
    return AVERROR_OPTION_NOT_FOUND;
}

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/*
 * Check whether given option is a group separator.
 *
 * @return index of the group definition that matched or -1 if none
 */
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static int match_group_separator(const OptionGroupDef *groups, int nb_groups,
                                 const char *opt)
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{
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    int i;
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    for (i = 0; i < nb_groups; i++) {
        const OptionGroupDef *p = &groups[i];
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        if (p->sep && !strcmp(p->sep, opt))
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            return i;
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    }

    return -1;
}

/*
 * Finish parsing an option group.
 *
 * @param group_idx which group definition should this group belong to
 * @param arg argument of the group delimiting option
 */
static void finish_group(OptionParseContext *octx, int group_idx,
                         const char *arg)
{
    OptionGroupList *l = &octx->groups[group_idx];
    OptionGroup *g;

    GROW_ARRAY(l->groups, l->nb_groups);
    g = &l->groups[l->nb_groups - 1];

    *g             = octx->cur_group;
    g->arg         = arg;
    g->group_def   = l->group_def;
#if CONFIG_SWSCALE
    g->sws_opts    = sws_opts;
#endif
    g->codec_opts  = codec_opts;
    g->format_opts = format_opts;
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    g->resample_opts = resample_opts;
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    codec_opts  = NULL;
    format_opts = NULL;
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    resample_opts = NULL;
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#if CONFIG_SWSCALE
    sws_opts    = NULL;
#endif
    init_opts();

    memset(&octx->cur_group, 0, sizeof(octx->cur_group));
}

/*
 * Add an option instance to currently parsed group.
 */
static void add_opt(OptionParseContext *octx, const OptionDef *opt,
                    const char *key, const char *val)
{
    int global = !(opt->flags & (OPT_PERFILE | OPT_SPEC | OPT_OFFSET));
    OptionGroup *g = global ? &octx->global_opts : &octx->cur_group;

    GROW_ARRAY(g->opts, g->nb_opts);
    g->opts[g->nb_opts - 1].opt = opt;
    g->opts[g->nb_opts - 1].key = key;
    g->opts[g->nb_opts - 1].val = val;
}

static void init_parse_context(OptionParseContext *octx,
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                               const OptionGroupDef *groups, int nb_groups)
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{
    static const OptionGroupDef global_group = { "global" };
    int i;

    memset(octx, 0, sizeof(*octx));

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    octx->nb_groups = nb_groups;
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    octx->groups    = av_mallocz(sizeof(*octx->groups) * octx->nb_groups);
    if (!octx->groups)
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        exit_program(1);
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    for (i = 0; i < octx->nb_groups; i++)
        octx->groups[i].group_def = &groups[i];

    octx->global_opts.group_def = &global_group;
    octx->global_opts.arg       = "";

    init_opts();
}

void uninit_parse_context(OptionParseContext *octx)
{
    int i, j;

    for (i = 0; i < octx->nb_groups; i++) {
        OptionGroupList *l = &octx->groups[i];

        for (j = 0; j < l->nb_groups; j++) {
            av_freep(&l->groups[j].opts);
            av_dict_free(&l->groups[j].codec_opts);
            av_dict_free(&l->groups[j].format_opts);
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            av_dict_free(&l->groups[j].resample_opts);
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#if CONFIG_SWSCALE
            sws_freeContext(l->groups[j].sws_opts);
#endif
        }
        av_freep(&l->groups);
    }
    av_freep(&octx->groups);

    av_freep(&octx->cur_group.opts);
    av_freep(&octx->global_opts.opts);

    uninit_opts();
}

int split_commandline(OptionParseContext *octx, int argc, char *argv[],
                      const OptionDef *options,
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                      const OptionGroupDef *groups, int nb_groups)
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{
    int optindex = 1;

    /* perform system-dependent conversions for arguments list */
    prepare_app_arguments(&argc, &argv);

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    init_parse_context(octx, groups, nb_groups);
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    av_log(NULL, AV_LOG_DEBUG, "Splitting the commandline.\n");

    while (optindex < argc) {
        const char *opt = argv[optindex++], *arg;
        const OptionDef *po;
        int ret;

        av_log(NULL, AV_LOG_DEBUG, "Reading option '%s' ...", opt);

        /* unnamed group separators, e.g. output filename */
        if (opt[0] != '-' || !opt[1]) {
            finish_group(octx, 0, opt);
            av_log(NULL, AV_LOG_DEBUG, " matched as %s.\n", groups[0].name);
            continue;
        }
        opt++;

#define GET_ARG(arg)                                                           \
do {                                                                           \
    arg = argv[optindex++];                                                    \
    if (!arg) {                                                                \
        av_log(NULL, AV_LOG_ERROR, "Missing argument for option '%s'.\n", opt);\
        return AVERROR(EINVAL);                                                \
    }                                                                          \
} while (0)

        /* named group separators, e.g. -i */
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        if ((ret = match_group_separator(groups, nb_groups, opt)) >= 0) {
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            GET_ARG(arg);
            finish_group(octx, ret, arg);
            av_log(NULL, AV_LOG_DEBUG, " matched as %s with argument '%s'.\n",
                   groups[ret].name, arg);
            continue;
        }

        /* normal options */
        po = find_option(options, opt);
        if (po->name) {
            if (po->flags & OPT_EXIT) {
                /* optional argument, e.g. -h */
                arg = argv[optindex++];
            } else if (po->flags & HAS_ARG) {
                GET_ARG(arg);
            } else {
                arg = "1";
            }

            add_opt(octx, po, opt, arg);
            av_log(NULL, AV_LOG_DEBUG, " matched as option '%s' (%s) with "
                   "argument '%s'.\n", po->name, po->help, arg);
            continue;
        }

        /* AVOptions */
        if (argv[optindex]) {
            ret = opt_default(NULL, opt, argv[optindex]);
            if (ret >= 0) {
                av_log(NULL, AV_LOG_DEBUG, " matched as AVOption '%s' with "
                       "argument '%s'.\n", opt, argv[optindex]);
                optindex++;
                continue;
            } else if (ret != AVERROR_OPTION_NOT_FOUND) {
                av_log(NULL, AV_LOG_ERROR, "Error parsing option '%s' "
                       "with argument '%s'.\n", opt, argv[optindex]);
                return ret;
            }
        }

        /* boolean -nofoo options */
        if (opt[0] == 'n' && opt[1] == 'o' &&
            (po = find_option(options, opt + 2)) &&
            po->name && po->flags & OPT_BOOL) {
            add_opt(octx, po, opt, "0");
            av_log(NULL, AV_LOG_DEBUG, " matched as option '%s' (%s) with "
                   "argument 0.\n", po->name, po->help);
            continue;
        }

        av_log(NULL, AV_LOG_ERROR, "Unrecognized option '%s'.\n", opt);
        return AVERROR_OPTION_NOT_FOUND;
    }

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    if (octx->cur_group.nb_opts || codec_opts || format_opts || resample_opts)
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        av_log(NULL, AV_LOG_WARNING, "Trailing options were found on the "
               "commandline.\n");

    av_log(NULL, AV_LOG_DEBUG, "Finished splitting the commandline.\n");

    return 0;
}

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int opt_cpuflags(void *optctx, const char *opt, const char *arg)
{
    int flags = av_parse_cpu_flags(arg);

    if (flags < 0)
        return flags;

    av_set_cpu_flags_mask(flags);
    return 0;
}

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int opt_loglevel(void *optctx, const char *opt, const char *arg)
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{
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    const struct { const char *name; int level; } log_levels[] = {
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        { "quiet"  , AV_LOG_QUIET   },
        { "panic"  , AV_LOG_PANIC   },
        { "fatal"  , AV_LOG_FATAL   },
        { "error"  , AV_LOG_ERROR   },
        { "warning", AV_LOG_WARNING },
        { "info"   , AV_LOG_INFO    },
        { "verbose", AV_LOG_VERBOSE },
        { "debug"  , AV_LOG_DEBUG   },
    };
    char *tail;
    int level;
    int i;

    for (i = 0; i < FF_ARRAY_ELEMS(log_levels); i++) {
        if (!strcmp(log_levels[i].name, arg)) {
            av_log_set_level(log_levels[i].level);
            return 0;
        }
    }

    level = strtol(arg, &tail, 10);
    if (*tail) {
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        av_log(NULL, AV_LOG_FATAL, "Invalid loglevel \"%s\". "
               "Possible levels are numbers or:\n", arg);
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        for (i = 0; i < FF_ARRAY_ELEMS(log_levels); i++)
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            av_log(NULL, AV_LOG_FATAL, "\"%s\"\n", log_levels[i].name);
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        exit_program(1);
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    }
    av_log_set_level(level);
    return 0;
}

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int opt_timelimit(void *optctx, const char *opt, const char *arg)
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{
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#if HAVE_SETRLIMIT
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    int lim = parse_number_or_die(opt, arg, OPT_INT64, 0, INT_MAX);
    struct rlimit rl = { lim, lim + 1 };
    if (setrlimit(RLIMIT_CPU, &rl))
        perror("setrlimit");
#else
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    av_log(NULL, AV_LOG_WARNING, "-%s not implemented on this OS\n", opt);
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#endif
    return 0;
}

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void print_error(const char *filename, int err)
{
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    char errbuf[128];
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    const char *errbuf_ptr = errbuf;
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    if (av_strerror(err, errbuf, sizeof(errbuf)) < 0)
        errbuf_ptr = strerror(AVUNERROR(err));
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    av_log(NULL, AV_LOG_ERROR, "%s: %s\n", filename, errbuf_ptr);
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}
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static int warned_cfg = 0;

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#define INDENT        1
#define SHOW_VERSION  2
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#define SHOW_CONFIG   4
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#define PRINT_LIB_INFO(libname, LIBNAME, flags, level)                  \
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    if (CONFIG_##LIBNAME) {                                             \
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        const char *indent = flags & INDENT? "  " : "";                 \
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        if (flags & SHOW_VERSION) {                                     \
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            unsigned int version = libname##_version();                 \
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            av_log(NULL, level,                                         \
                   "%slib%-10s %2d.%3d.%2d / %2d.%3d.%2d\n",            \
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                   indent, #libname,                                    \
                   LIB##LIBNAME##_VERSION_MAJOR,                        \
                   LIB##LIBNAME##_VERSION_MINOR,                        \
                   LIB##LIBNAME##_VERSION_MICRO,                        \
                   version >> 16, version >> 8 & 0xff, version & 0xff); \
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        }                                                               \
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        if (flags & SHOW_CONFIG) {                                      \
            const char *cfg = libname##_configuration();                \
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            if (strcmp(LIBAV_CONFIGURATION, cfg)) {                     \
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                if (!warned_cfg) {                                      \
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                    av_log(NULL, level,                                 \
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                            "%sWARNING: library configuration mismatch\n", \
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                            indent);                                    \
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                    warned_cfg = 1;                                     \
                }                                                       \
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                av_log(NULL, level, "%s%-11s configuration: %s\n",      \
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                        indent, #libname, cfg);                         \
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            }                                                           \
        }                                                               \
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    }                                                                   \
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static void print_all_libs_info(int flags, int level)
803
{
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    PRINT_LIB_INFO(avutil,   AVUTIL,   flags, level);
    PRINT_LIB_INFO(avcodec,  AVCODEC,  flags, level);
    PRINT_LIB_INFO(avformat, AVFORMAT, flags, level);
    PRINT_LIB_INFO(avdevice, AVDEVICE, flags, level);
    PRINT_LIB_INFO(avfilter, AVFILTER, flags, level);
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    PRINT_LIB_INFO(avresample, AVRESAMPLE, flags, level);
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    PRINT_LIB_INFO(swscale,  SWSCALE,  flags, level);
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}

813
void show_banner(void)
814
{
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    av_log(NULL, AV_LOG_INFO,
           "%s version " LIBAV_VERSION ", Copyright (c) %d-%d the Libav developers\n",
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           program_name, program_birth_year, this_year);
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    av_log(NULL, AV_LOG_INFO, "  built on %s %s with %s\n",
           __DATE__, __TIME__, CC_IDENT);
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    av_log(NULL, AV_LOG_VERBOSE, "  configuration: " LIBAV_CONFIGURATION "\n");
    print_all_libs_info(INDENT|SHOW_CONFIG,  AV_LOG_VERBOSE);
    print_all_libs_info(INDENT|SHOW_VERSION, AV_LOG_VERBOSE);
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}

825
int show_version(void *optctx, const char *opt, const char *arg)
826
{
827
    av_log_set_callback(log_callback_help);
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    printf("%s " LIBAV_VERSION "\n", program_name);
829
    print_all_libs_info(SHOW_VERSION, AV_LOG_INFO);
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    return 0;
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}

834
int show_license(void *optctx, const char *opt, const char *arg)
835
{
836
    printf(
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#if CONFIG_NONFREE
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    "This version of %s has nonfree parts compiled in.\n"
    "Therefore it is not legally redistributable.\n",
    program_name
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#elif CONFIG_GPLV3
    "%s is free software; you can redistribute it and/or modify\n"
    "it under the terms of the GNU General Public License as published by\n"
    "the Free Software Foundation; either version 3 of the License, or\n"
    "(at your option) any later version.\n"
    "\n"
    "%s is distributed in the hope that it will be useful,\n"
    "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
    "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
    "GNU General Public License for more details.\n"
    "\n"
    "You should have received a copy of the GNU General Public License\n"
    "along with %s.  If not, see <http://www.gnu.org/licenses/>.\n",
    program_name, program_name, program_name
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#elif CONFIG_GPL
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    "%s is free software; you can redistribute it and/or modify\n"
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    "it under the terms of the GNU General Public License as published by\n"
    "the Free Software Foundation; either version 2 of the License, or\n"
    "(at your option) any later version.\n"
    "\n"
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    "%s is distributed in the hope that it will be useful,\n"
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    "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
    "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
    "GNU General Public License for more details.\n"
    "\n"
    "You should have received a copy of the GNU General Public License\n"
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    "along with %s; if not, write to the Free Software\n"
    "Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA\n",
    program_name, program_name, program_name
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#elif CONFIG_LGPLV3
    "%s is free software; you can redistribute it and/or modify\n"
    "it under the terms of the GNU Lesser General Public License as published by\n"
    "the Free Software Foundation; either version 3 of the License, or\n"
    "(at your option) any later version.\n"
    "\n"
    "%s is distributed in the hope that it will be useful,\n"
    "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
    "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
    "GNU Lesser General Public License for more details.\n"
    "\n"
    "You should have received a copy of the GNU Lesser General Public License\n"
    "along with %s.  If not, see <http://www.gnu.org/licenses/>.\n",
    program_name, program_name, program_name
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#else
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    "%s is free software; you can redistribute it and/or\n"
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    "modify it under the terms of the GNU Lesser General Public\n"
    "License as published by the Free Software Foundation; either\n"
    "version 2.1 of the License, or (at your option) any later version.\n"
    "\n"
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    "%s is distributed in the hope that it will be useful,\n"
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    "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
    "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU\n"
    "Lesser General Public License for more details.\n"
    "\n"
    "You should have received a copy of the GNU Lesser General Public\n"
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    "License along with %s; if not, write to the Free Software\n"
    "Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA\n",
    program_name, program_name, program_name
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#endif
900
    );
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    return 0;
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}
904

905
int show_formats(void *optctx, const char *opt, const char *arg)
906
{
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    AVInputFormat *ifmt  = NULL;
    AVOutputFormat *ofmt = NULL;
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    const char *last_name;

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    printf("File formats:\n"
           " D. = Demuxing supported\n"
           " .E = Muxing supported\n"
           " --\n");
    last_name = "000";
    for (;;) {
        int decode = 0;
        int encode = 0;
        const char *name      = NULL;
        const char *long_name = NULL;

        while ((ofmt = av_oformat_next(ofmt))) {
            if ((name == NULL || strcmp(ofmt->name, name) < 0) &&
                strcmp(ofmt->name, last_name) > 0) {
                name      = ofmt->name;
                long_name = ofmt->long_name;
                encode    = 1;
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            }
        }
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        while ((ifmt = av_iformat_next(ifmt))) {
            if ((name == NULL || strcmp(ifmt->name, name) < 0) &&
                strcmp(ifmt->name, last_name) > 0) {
                name      = ifmt->name;
                long_name = ifmt->long_name;
                encode    = 0;
936
            }
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            if (name && strcmp(ifmt->name, name) == 0)
                decode = 1;
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        }
940
        if (name == NULL)
941
            break;
942
        last_name = name;
943

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        printf(" %s%s %-15s %s\n",
               decode ? "D" : " ",
               encode ? "E" : " ",
               name,
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            long_name ? long_name:" ");
    }
950
    return 0;
951
}
952

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#define PRINT_CODEC_SUPPORTED(codec, field, type, list_name, term, get_name) \
    if (codec->field) {                                                      \
        const type *p = c->field;                                            \
                                                                             \
        printf("    Supported " list_name ":");                              \
        while (*p != term) {                                                 \
            get_name(*p);                                                    \
            printf(" %s", name);                                             \
            p++;                                                             \
        }                                                                    \
        printf("\n");                                                        \
    }                                                                        \

static void print_codec(const AVCodec *c)
{
    int encoder = av_codec_is_encoder(c);

    printf("%s %s [%s]:\n", encoder ? "Encoder" : "Decoder", c->name,
           c->long_name ? c->long_name : "");

    if (c->type == AVMEDIA_TYPE_VIDEO) {
        printf("    Threading capabilities: ");
        switch (c->capabilities & (CODEC_CAP_FRAME_THREADS |
                                   CODEC_CAP_SLICE_THREADS)) {
        case CODEC_CAP_FRAME_THREADS |
             CODEC_CAP_SLICE_THREADS: printf("frame and slice"); break;
        case CODEC_CAP_FRAME_THREADS: printf("frame");           break;
        case CODEC_CAP_SLICE_THREADS: printf("slice");           break;
        default:                      printf("no");              break;
        }
        printf("\n");
    }

    if (c->supported_framerates) {
        const AVRational *fps = c->supported_framerates;

        printf("    Supported framerates:");
        while (fps->num) {
            printf(" %d/%d", fps->num, fps->den);
            fps++;
        }
        printf("\n");
    }
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    PRINT_CODEC_SUPPORTED(c, pix_fmts, enum AVPixelFormat, "pixel formats",
                          AV_PIX_FMT_NONE, GET_PIX_FMT_NAME);
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    PRINT_CODEC_SUPPORTED(c, supported_samplerates, int, "sample rates", 0,
                          GET_SAMPLE_RATE_NAME);
    PRINT_CODEC_SUPPORTED(c, sample_fmts, enum AVSampleFormat, "sample formats",
                          AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME);
    PRINT_CODEC_SUPPORTED(c, channel_layouts, uint64_t, "channel layouts",
                          0, GET_CH_LAYOUT_DESC);

    if (c->priv_class) {
        show_help_children(c->priv_class,
                           AV_OPT_FLAG_ENCODING_PARAM |
                           AV_OPT_FLAG_DECODING_PARAM);
    }
}

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static char get_media_type_char(enum AVMediaType type)
{
    switch (type) {
        case AVMEDIA_TYPE_VIDEO:    return 'V';
        case AVMEDIA_TYPE_AUDIO:    return 'A';
        case AVMEDIA_TYPE_SUBTITLE: return 'S';
        default:                    return '?';
    }
}

static const AVCodec *next_codec_for_id(enum AVCodecID id, const AVCodec *prev,
                                        int encoder)
{
    while ((prev = av_codec_next(prev))) {
        if (prev->id == id &&
            (encoder ? av_codec_is_encoder(prev) : av_codec_is_decoder(prev)))
            return prev;
    }
    return NULL;
}

static void print_codecs_for_id(enum AVCodecID id, int encoder)
{
    const AVCodec *codec = NULL;

    printf(" (%s: ", encoder ? "encoders" : "decoders");

    while ((codec = next_codec_for_id(id, codec, encoder)))
        printf("%s ", codec->name);

    printf(")");
}

1045
int show_codecs(void *optctx, const char *opt, const char *arg)
1046
{
1047 1048
    const AVCodecDescriptor *desc = NULL;

1049
    printf("Codecs:\n"
1050 1051 1052 1053 1054 1055 1056 1057 1058
           " D..... = Decoding supported\n"
           " .E.... = Encoding supported\n"
           " ..V... = Video codec\n"
           " ..A... = Audio codec\n"
           " ..S... = Subtitle codec\n"
           " ...I.. = Intra frame-only codec\n"
           " ....L. = Lossy compression\n"
           " .....S = Lossless compression\n"
           " -------\n");
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    while ((desc = avcodec_descriptor_next(desc))) {
        const AVCodec *codec = NULL;

        printf(avcodec_find_decoder(desc->id) ? "D" : ".");
        printf(avcodec_find_encoder(desc->id) ? "E" : ".");

        printf("%c", get_media_type_char(desc->type));
        printf((desc->props & AV_CODEC_PROP_INTRA_ONLY) ? "I" : ".");
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        printf((desc->props & AV_CODEC_PROP_LOSSY)      ? "L" : ".");
        printf((desc->props & AV_CODEC_PROP_LOSSLESS)   ? "S" : ".");
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        printf(" %-20s %s", desc->name, desc->long_name ? desc->long_name : "");

        /* print decoders/encoders when there's more than one or their
         * names are different from codec name */
        while ((codec = next_codec_for_id(desc->id, codec, 0))) {
            if (strcmp(codec->name, desc->name)) {
                print_codecs_for_id(desc->id, 0);
                break;
1078
            }
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        }
        codec = NULL;
        while ((codec = next_codec_for_id(desc->id, codec, 1))) {
            if (strcmp(codec->name, desc->name)) {
                print_codecs_for_id(desc->id, 1);
                break;
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            }
        }

        printf("\n");
    }
1090
    return 0;
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}

static void print_codecs(int encoder)
{
    const AVCodecDescriptor *desc = NULL;

    printf("%s:\n"
           " V... = Video\n"
           " A... = Audio\n"
           " S... = Subtitle\n"
           " .F.. = Frame-level multithreading\n"
           " ..S. = Slice-level multithreading\n"
           " ...X = Codec is experimental\n"
           " ---\n",
           encoder ? "Encoders" : "Decoders");
    while ((desc = avcodec_descriptor_next(desc))) {
        const AVCodec *codec = NULL;

        while ((codec = next_codec_for_id(desc->id, codec, encoder))) {
            printf("%c", get_media_type_char(desc->type));
            printf((codec->capabilities & CODEC_CAP_FRAME_THREADS) ? "F" : ".");
            printf((codec->capabilities & CODEC_CAP_SLICE_THREADS) ? "S" : ".");
            printf((codec->capabilities & CODEC_CAP_EXPERIMENTAL)  ? "X" : ".");

            printf(" %-20s %s", codec->name, codec->long_name ? codec->long_name : "");
            if (strcmp(codec->name, desc->name))
                printf(" (codec %s)", desc->name);

            printf("\n");
        }
    }
}

1124
int show_decoders(void *optctx, const char *opt, const char *arg)
1125 1126 1127 1128 1129
{
    print_codecs(0);
    return 0;
}

1130
int show_encoders(void *optctx, const char *opt, const char *arg)
1131 1132 1133
{
    print_codecs(1);
    return 0;
1134 1135
}

1136
int show_bsfs(void *optctx, const char *opt, const char *arg)
1137
{
1138
    AVBitStreamFilter *bsf = NULL;
1139 1140

    printf("Bitstream filters:\n");
1141
    while ((bsf = av_bitstream_filter_next(bsf)))
1142
        printf("%s\n", bsf->name);
1143
    printf("\n");
1144
    return 0;
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}

1147
int show_protocols(void *optctx, const char *opt, const char *arg)
1148
{
1149 1150
    void *opaque = NULL;
    const char *name;
1151

1152
    printf("Supported file protocols:\n"
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           "Input:\n");
    while ((name = avio_enum_protocols(&opaque, 0)))
        printf("%s\n", name);
    printf("Output:\n");
    while ((name = avio_enum_protocols(&opaque, 1)))
        printf("%s\n", name);
1159
    return 0;
1160
}
1161

1162
int show_filters(void *optctx, const char *opt, const char *arg)
1163
{
1164
    const AVFilter av_unused(*filter) = NULL;
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    printf("Filters:\n");
1167
#if CONFIG_AVFILTER
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    while ((filter = avfilter_next(filter)))
        printf("%-16s %s\n", filter->name, filter->description);
1170
#endif
1171
    return 0;
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}

1174
int show_pix_fmts(void *optctx, const char *opt, const char *arg)
1175
{
1176
    const AVPixFmtDescriptor *pix_desc = NULL;
1177

1178 1179 1180 1181 1182 1183 1184 1185
    printf("Pixel formats:\n"
           "I.... = Supported Input  format for conversion\n"
           ".O... = Supported Output format for conversion\n"
           "..H.. = Hardware accelerated format\n"
           "...P. = Paletted format\n"
           "....B = Bitstream format\n"
           "FLAGS NAME            NB_COMPONENTS BITS_PER_PIXEL\n"
           "-----\n");
1186

1187 1188 1189 1190 1191
#if !CONFIG_SWSCALE
#   define sws_isSupportedInput(x)  0
#   define sws_isSupportedOutput(x) 0
#endif

1192 1193
    while ((pix_desc = av_pix_fmt_desc_next(pix_desc))) {
        enum AVPixelFormat pix_fmt = av_pix_fmt_desc_get_id(pix_desc);
1194
        printf("%c%c%c%c%c %-16s       %d            %2d\n",
1195 1196 1197 1198 1199
               sws_isSupportedInput (pix_fmt)              ? 'I' : '.',
               sws_isSupportedOutput(pix_fmt)              ? 'O' : '.',
               pix_desc->flags & AV_PIX_FMT_FLAG_HWACCEL   ? 'H' : '.',
               pix_desc->flags & AV_PIX_FMT_FLAG_PAL       ? 'P' : '.',
               pix_desc->flags & AV_PIX_FMT_FLAG_BITSTREAM ? 'B' : '.',
1200 1201 1202 1203
               pix_desc->name,
               pix_desc->nb_components,
               av_get_bits_per_pixel(pix_desc));
    }
1204
    return 0;
1205 1206
}

1207
int show_sample_fmts(void *optctx, const char *opt, const char *arg)
1208 1209 1210 1211 1212 1213 1214 1215
{
    int i;
    char fmt_str[128];
    for (i = -1; i < AV_SAMPLE_FMT_NB; i++)
        printf("%s\n", av_get_sample_fmt_string(fmt_str, sizeof(fmt_str), i));
    return 0;
}

1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250
static void show_help_codec(const char *name, int encoder)
{
    const AVCodecDescriptor *desc;
    const AVCodec *codec;

    if (!name) {
        av_log(NULL, AV_LOG_ERROR, "No codec name specified.\n");
        return;
    }

    codec = encoder ? avcodec_find_encoder_by_name(name) :
                      avcodec_find_decoder_by_name(name);

    if (codec)
        print_codec(codec);
    else if ((desc = avcodec_descriptor_get_by_name(name))) {
        int printed = 0;

        while ((codec = next_codec_for_id(desc->id, codec, encoder))) {
            printed = 1;
            print_codec(codec);
        }

        if (!printed) {
            av_log(NULL, AV_LOG_ERROR, "Codec '%s' is known to Libav, "
                   "but no %s for it are available. Libav might need to be "
                   "recompiled with additional external libraries.\n",
                   name, encoder ? "encoders" : "decoders");
        }
    } else {
        av_log(NULL, AV_LOG_ERROR, "Codec '%s' is not recognized by Libav.\n",
               name);
    }
}

1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301
static void show_help_demuxer(const char *name)
{
    const AVInputFormat *fmt = av_find_input_format(name);

    if (!fmt) {
        av_log(NULL, AV_LOG_ERROR, "Unknown format '%s'.\n", name);
        return;
    }

    printf("Demuxer %s [%s]:\n", fmt->name, fmt->long_name);

    if (fmt->extensions)
        printf("    Common extensions: %s.\n", fmt->extensions);

    if (fmt->priv_class)
        show_help_children(fmt->priv_class, AV_OPT_FLAG_DECODING_PARAM);
}

static void show_help_muxer(const char *name)
{
    const AVCodecDescriptor *desc;
    const AVOutputFormat *fmt = av_guess_format(name, NULL, NULL);

    if (!fmt) {
        av_log(NULL, AV_LOG_ERROR, "Unknown format '%s'.\n", name);
        return;
    }

    printf("Muxer %s [%s]:\n", fmt->name, fmt->long_name);

    if (fmt->extensions)
        printf("    Common extensions: %s.\n", fmt->extensions);
    if (fmt->mime_type)
        printf("    Mime type: %s.\n", fmt->mime_type);
    if (fmt->video_codec != AV_CODEC_ID_NONE &&
        (desc = avcodec_descriptor_get(fmt->video_codec))) {
        printf("    Default video codec: %s.\n", desc->name);
    }
    if (fmt->audio_codec != AV_CODEC_ID_NONE &&
        (desc = avcodec_descriptor_get(fmt->audio_codec))) {
        printf("    Default audio codec: %s.\n", desc->name);
    }
    if (fmt->subtitle_codec != AV_CODEC_ID_NONE &&
        (desc = avcodec_descriptor_get(fmt->subtitle_codec))) {
        printf("    Default subtitle codec: %s.\n", desc->name);
    }

    if (fmt->priv_class)
        show_help_children(fmt->priv_class, AV_OPT_FLAG_ENCODING_PARAM);
}

1302
#if CONFIG_AVFILTER
1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316
static void show_help_filter(const char *name)
{
    const AVFilter *f = avfilter_get_by_name(name);
    int i, count;

    if (!name) {
        av_log(NULL, AV_LOG_ERROR, "No filter name specified.\n");
        return;
    } else if (!f) {
        av_log(NULL, AV_LOG_ERROR, "Unknown filter '%s'.\n", name);
        return;
    }

    printf("Filter %s [%s]:\n", f->name, f->description);
1317 1318 1319

    if (f->flags & AVFILTER_FLAG_SLICE_THREADS)
        printf("    slice threading supported\n");
1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342

    printf("    Inputs:\n");
    count = avfilter_pad_count(f->inputs);
    for (i = 0; i < count; i++) {
        printf("        %d %s (%s)\n", i, avfilter_pad_get_name(f->inputs, i),
               media_type_string(avfilter_pad_get_type(f->inputs, i)));
    }
    if (f->flags & AVFILTER_FLAG_DYNAMIC_INPUTS)
        printf("        dynamic (depending on the options)\n");

    printf("    Outputs:\n");
    count = avfilter_pad_count(f->outputs);
    for (i = 0; i < count; i++) {
        printf("        %d %s (%s)\n", i, avfilter_pad_get_name(f->outputs, i),
               media_type_string(avfilter_pad_get_type(f->outputs, i)));
    }
    if (f->flags & AVFILTER_FLAG_DYNAMIC_OUTPUTS)
        printf("        dynamic (depending on the options)\n");

    if (f->priv_class)
        show_help_children(f->priv_class, AV_OPT_FLAG_VIDEO_PARAM |
                                          AV_OPT_FLAG_AUDIO_PARAM);
}
1343
#endif
1344

1345
int show_help(void *optctx, const char *opt, const char *arg)
1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360
{
    char *topic, *par;
    av_log_set_callback(log_callback_help);

    topic = av_strdup(arg ? arg : "");
    par = strchr(topic, '=');
    if (par)
        *par++ = 0;

    if (!*topic) {
        show_help_default(topic, par);
    } else if (!strcmp(topic, "decoder")) {
        show_help_codec(par, 0);
    } else if (!strcmp(topic, "encoder")) {
        show_help_codec(par, 1);
1361 1362 1363 1364
    } else if (!strcmp(topic, "demuxer")) {
        show_help_demuxer(par);
    } else if (!strcmp(topic, "muxer")) {
        show_help_muxer(par);
1365
#if CONFIG_AVFILTER
1366 1367
    } else if (!strcmp(topic, "filter")) {
        show_help_filter(par);
1368
#endif
1369 1370 1371 1372 1373 1374 1375 1376
    } else {
        show_help_default(topic, par);
    }

    av_freep(&topic);
    return 0;
}

1377 1378 1379
int read_yesno(void)
{
    int c = getchar();
1380
    int yesno = (av_toupper(c) == 'Y');
1381 1382 1383 1384 1385 1386

    while (c != '\n' && c != EOF)
        c = getchar();

    return yesno;
}
1387

1388
int cmdutils_read_file(const char *filename, char **bufptr, size_t *size)
1389
{
1390
    int ret;
1391
    FILE *f = fopen(filename, "rb");
1392 1393

    if (!f) {
1394 1395
        av_log(NULL, AV_LOG_ERROR, "Cannot read file '%s': %s\n", filename,
               strerror(errno));
1396 1397 1398 1399 1400 1401 1402
        return AVERROR(errno);
    }
    fseek(f, 0, SEEK_END);
    *size = ftell(f);
    fseek(f, 0, SEEK_SET);
    *bufptr = av_malloc(*size + 1);
    if (!*bufptr) {
1403
        av_log(NULL, AV_LOG_ERROR, "Could not allocate file buffer\n");
1404 1405 1406
        fclose(f);
        return AVERROR(ENOMEM);
    }
1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417
    ret = fread(*bufptr, 1, *size, f);
    if (ret < *size) {
        av_free(*bufptr);
        if (ferror(f)) {
            av_log(NULL, AV_LOG_ERROR, "Error while reading file '%s': %s\n",
                   filename, strerror(errno));
            ret = AVERROR(errno);
        } else
            ret = AVERROR_EOF;
    } else {
        ret = 0;
1418
        (*bufptr)[(*size)++] = '\0';
1419
    }
1420 1421

    fclose(f);
1422
    return ret;
1423
}
1424 1425 1426 1427 1428 1429 1430

void init_pts_correction(PtsCorrectionContext *ctx)
{
    ctx->num_faulty_pts = ctx->num_faulty_dts = 0;
    ctx->last_pts = ctx->last_dts = INT64_MIN;
}

1431 1432
int64_t guess_correct_pts(PtsCorrectionContext *ctx, int64_t reordered_pts,
                          int64_t dts)
1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443
{
    int64_t pts = AV_NOPTS_VALUE;

    if (dts != AV_NOPTS_VALUE) {
        ctx->num_faulty_dts += dts <= ctx->last_dts;
        ctx->last_dts = dts;
    }
    if (reordered_pts != AV_NOPTS_VALUE) {
        ctx->num_faulty_pts += reordered_pts <= ctx->last_pts;
        ctx->last_pts = reordered_pts;
    }
1444
    if ((ctx->num_faulty_pts<=ctx->num_faulty_dts || dts == AV_NOPTS_VALUE)
1445
        && reordered_pts != AV_NOPTS_VALUE)
1446 1447 1448 1449 1450 1451
        pts = reordered_pts;
    else
        pts = dts;

    return pts;
}
1452

1453
FILE *get_preset_file(char *filename, size_t filename_size,
1454 1455
                      const char *preset_name, int is_path,
                      const char *codec_name)