mirror of
https://github.com/FFmpeg/FFmpeg.git
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f9810be5d3
Signed-off-by: Marton Balint <cus@passwd.hu>
493 lines
16 KiB
C
493 lines
16 KiB
C
/*
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* Various utilities for command line tools
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* copyright (c) 2003 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* 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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* FFmpeg 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; 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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#ifndef FFTOOLS_CMDUTILS_H
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#define FFTOOLS_CMDUTILS_H
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#include <stdint.h>
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#include "config.h"
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#include "libavcodec/avcodec.h"
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#include "libavfilter/avfilter.h"
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#include "libavformat/avformat.h"
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#include "libswscale/swscale.h"
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#ifdef _WIN32
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#undef main /* We don't want SDL to override our main() */
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#endif
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/**
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* program name, defined by the program for show_version().
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*/
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extern const char program_name[];
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/**
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* program birth year, defined by the program for show_banner()
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*/
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extern const int program_birth_year;
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extern AVDictionary *sws_dict;
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extern AVDictionary *swr_opts;
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extern AVDictionary *format_opts, *codec_opts;
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extern int hide_banner;
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/**
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* Initialize dynamic library loading
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*/
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void init_dynload(void);
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/**
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* Uninitialize the cmdutils option system, in particular
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* free the *_opts contexts and their contents.
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*/
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void uninit_opts(void);
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/**
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* Trivial log callback.
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* Only suitable for opt_help and similar since it lacks prefix handling.
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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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/**
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* Fallback for options that are not explicitly handled, these will be
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* parsed through AVOptions.
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*/
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int opt_default(void *optctx, const char *opt, const char *arg);
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/**
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* Limit the execution time.
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*/
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int opt_timelimit(void *optctx, const char *opt, const char *arg);
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enum OptionType {
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OPT_TYPE_FUNC,
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OPT_TYPE_BOOL,
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OPT_TYPE_STRING,
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OPT_TYPE_INT,
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OPT_TYPE_INT64,
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OPT_TYPE_FLOAT,
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OPT_TYPE_DOUBLE,
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OPT_TYPE_TIME,
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};
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/**
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* Parse a string and return its corresponding value as a double.
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*
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* @param context the context of the value to be set (e.g. the
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* corresponding command line option name)
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* @param numstr the string to be parsed
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* @param type the type (OPT_INT64 or OPT_FLOAT) as which the
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* string should be parsed
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* @param min the minimum valid accepted value
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* @param max the maximum valid accepted value
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*/
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int parse_number(const char *context, const char *numstr, enum OptionType type,
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double min, double max, double *dst);
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typedef struct SpecifierOpt {
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char *specifier; /**< stream/chapter/program/... specifier */
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union {
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uint8_t *str;
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int i;
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int64_t i64;
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uint64_t ui64;
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float f;
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double dbl;
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} u;
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} SpecifierOpt;
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typedef struct SpecifierOptList {
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SpecifierOpt *opt;
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int nb_opt;
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/* Canonical option definition that was parsed into this list. */
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const struct OptionDef *opt_canon;
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enum OptionType type;
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} SpecifierOptList;
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typedef struct OptionDef {
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const char *name;
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enum OptionType type;
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int flags;
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/* The OPT_TYPE_FUNC option takes an argument.
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* Must not be used with other option types, as for those it holds:
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* - OPT_TYPE_BOOL do not take an argument
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* - all other types do
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*/
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#define OPT_FUNC_ARG (1 << 0)
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/* Program will immediately exit after processing this option */
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#define OPT_EXIT (1 << 1)
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/* Option is intended for advanced users. Only affects
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* help output.
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*/
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#define OPT_EXPERT (1 << 2)
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#define OPT_VIDEO (1 << 3)
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#define OPT_AUDIO (1 << 4)
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#define OPT_SUBTITLE (1 << 5)
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#define OPT_DATA (1 << 6)
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/* The option is per-file (currently ffmpeg-only). At least one of OPT_INPUT,
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* OPT_OUTPUT, OPT_DECODER must be set when this flag is in use.
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*/
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#define OPT_PERFILE (1 << 7)
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/* Option is specified as an offset in a passed optctx.
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* Always use as OPT_OFFSET in option definitions. */
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#define OPT_FLAG_OFFSET (1 << 8)
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#define OPT_OFFSET (OPT_FLAG_OFFSET | OPT_PERFILE)
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/* Option is to be stored in a SpecifierOptList.
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Always use as OPT_SPEC in option definitions. */
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#define OPT_FLAG_SPEC (1 << 9)
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#define OPT_SPEC (OPT_FLAG_SPEC | OPT_OFFSET)
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/* Option applies per-stream (implies OPT_SPEC). */
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#define OPT_FLAG_PERSTREAM (1 << 10)
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#define OPT_PERSTREAM (OPT_FLAG_PERSTREAM | OPT_SPEC)
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/* ffmpeg-only - specifies whether an OPT_PERFILE option applies to input,
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* output, or both. */
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#define OPT_INPUT (1 << 11)
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#define OPT_OUTPUT (1 << 12)
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/* This option is a "canonical" form, to which one or more alternatives
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* exist. These alternatives are listed in u1.names_alt. */
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#define OPT_HAS_ALT (1 << 13)
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/* This option is an alternative form of some other option, whose
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* name is stored in u1.name_canon */
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#define OPT_HAS_CANON (1 << 14)
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/* ffmpeg-only - OPT_PERFILE may apply to standalone decoders */
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#define OPT_DECODER (1 << 15)
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union {
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void *dst_ptr;
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int (*func_arg)(void *, const char *, const char *);
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size_t off;
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} u;
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const char *help;
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const char *argname;
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union {
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/* Name of the canonical form of this option.
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* Is valid when OPT_HAS_CANON is set. */
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const char *name_canon;
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/* A NULL-terminated list of alternate forms of this option.
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* Is valid when OPT_HAS_ALT is set. */
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const char * const *names_alt;
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} u1;
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} OptionDef;
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/**
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* Print help for all options matching specified flags.
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*
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* @param options a list of options
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* @param msg title of this group. Only printed if at least one option matches.
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* @param req_flags print only options which have all those flags set.
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* @param rej_flags don't print options which have any of those flags set.
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*/
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void show_help_options(const OptionDef *options, const char *msg, int req_flags,
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int rej_flags);
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/**
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* Show help for all options with given flags in class and all its
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* children.
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*/
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void show_help_children(const AVClass *class, int flags);
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/**
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* Per-fftool specific help handler. Implemented in each
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* fftool, called by show_help().
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*/
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void show_help_default(const char *opt, const char *arg);
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/**
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* Parse the command line arguments.
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*
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* @param optctx an opaque options context
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* @param argc number of command line arguments
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* @param argv values of command line arguments
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* @param options Array with the definitions required to interpret every
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* option of the form: -option_name [argument]
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* @param parse_arg_function Name of the function called to process every
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* argument without a leading option name flag. NULL if such arguments do
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* not have to be processed.
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*/
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int parse_options(void *optctx, int argc, char **argv, const OptionDef *options,
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int (* parse_arg_function)(void *optctx, const char*));
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/**
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* Parse one given option.
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*
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* @return on success 1 if arg was consumed, 0 otherwise; negative number on error
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*/
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int parse_option(void *optctx, const char *opt, const char *arg,
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const OptionDef *options);
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/**
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* An option extracted from the commandline.
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* Cannot use AVDictionary because of options like -map which can be
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* used multiple times.
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*/
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typedef struct Option {
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const OptionDef *opt;
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const char *key;
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const char *val;
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} Option;
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typedef struct OptionGroupDef {
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/**< group name */
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const char *name;
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/**
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* Option to be used as group separator. Can be NULL for groups which
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* are terminated by a non-option argument (e.g. ffmpeg output files)
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*/
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const char *sep;
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/**
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* Option flags that must be set on each option that is
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* applied to this group
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*/
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int flags;
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} OptionGroupDef;
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typedef struct OptionGroup {
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const OptionGroupDef *group_def;
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const char *arg;
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Option *opts;
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int nb_opts;
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AVDictionary *codec_opts;
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AVDictionary *format_opts;
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AVDictionary *sws_dict;
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AVDictionary *swr_opts;
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} OptionGroup;
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/**
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* A list of option groups that all have the same group type
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* (e.g. input files or output files)
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*/
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typedef struct OptionGroupList {
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const OptionGroupDef *group_def;
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OptionGroup *groups;
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int nb_groups;
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} OptionGroupList;
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typedef struct OptionParseContext {
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OptionGroup global_opts;
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OptionGroupList *groups;
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int nb_groups;
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/* parsing state */
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OptionGroup cur_group;
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} OptionParseContext;
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/**
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* Parse an options group and write results into optctx.
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*
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* @param optctx an app-specific options context. NULL for global options group
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*/
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int parse_optgroup(void *optctx, OptionGroup *g, const OptionDef *defs);
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/**
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* Split the commandline into an intermediate form convenient for further
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* processing.
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*
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* The commandline is assumed to be composed of options which either belong to a
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* group (those with OPT_SPEC, OPT_OFFSET or OPT_PERFILE) or are global
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* (everything else).
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*
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* A group (defined by an OptionGroupDef struct) is a sequence of options
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* terminated by either a group separator option (e.g. -i) or a parameter that
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* is not an option (doesn't start with -). A group without a separator option
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* must always be first in the supplied groups list.
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*
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* All options within the same group are stored in one OptionGroup struct in an
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* OptionGroupList, all groups with the same group definition are stored in one
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* OptionGroupList in OptionParseContext.groups. The order of group lists is the
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* same as the order of group definitions.
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*/
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int split_commandline(OptionParseContext *octx, int argc, char *argv[],
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const OptionDef *options,
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const OptionGroupDef *groups, int nb_groups);
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/**
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* Free all allocated memory in an OptionParseContext.
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*/
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void uninit_parse_context(OptionParseContext *octx);
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/**
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* Find the '-loglevel' option in the command line args and apply it.
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*/
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void parse_loglevel(int argc, char **argv, const OptionDef *options);
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/**
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* Return index of option opt in argv or 0 if not found.
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*/
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int locate_option(int argc, char **argv, const OptionDef *options,
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const char *optname);
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/**
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* Check if the given stream matches a stream specifier.
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*
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* @param s Corresponding format context.
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* @param st Stream from s to be checked.
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* @param spec A stream specifier of the [v|a|s|d]:[\<stream index\>] form.
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*
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* @return 1 if the stream matches, 0 if it doesn't, <0 on error
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*/
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int check_stream_specifier(AVFormatContext *s, AVStream *st, const char *spec);
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/**
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* Filter out options for given codec.
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*
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* Create a new options dictionary containing only the options from
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* opts which apply to the codec with ID codec_id.
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*
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* @param opts dictionary to place options in
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* @param codec_id ID of the codec that should be filtered for
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* @param s Corresponding format context.
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* @param st A stream from s for which the options should be filtered.
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* @param codec The particular codec for which the options should be filtered.
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* If null, the default one is looked up according to the codec id.
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* @param dst a pointer to the created dictionary
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* @return a non-negative number on success, a negative error code on failure
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*/
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int filter_codec_opts(const AVDictionary *opts, enum AVCodecID codec_id,
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AVFormatContext *s, AVStream *st, const AVCodec *codec,
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AVDictionary **dst);
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/**
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* Setup AVCodecContext options for avformat_find_stream_info().
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*
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* Create an array of dictionaries, one dictionary for each stream
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* contained in s.
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* Each dictionary will contain the options from codec_opts which can
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* be applied to the corresponding stream codec context.
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*/
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int setup_find_stream_info_opts(AVFormatContext *s,
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AVDictionary *codec_opts,
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AVDictionary ***dst);
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/**
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* Print an error message to stderr, indicating filename and a human
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* readable description of the error code err.
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*
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* If strerror_r() is not available the use of this function in a
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* multithreaded application may be unsafe.
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*
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* @see av_strerror()
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*/
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static inline void print_error(const char *filename, int err)
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{
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av_log(NULL, AV_LOG_ERROR, "%s: %s\n", filename, av_err2str(err));
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}
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/**
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* Print the program banner to stderr. The banner contents depend on the
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* current version of the repository and of the libav* libraries used by
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* the program.
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*/
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void show_banner(int argc, char **argv, const OptionDef *options);
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/**
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* Return a positive value if a line read from standard input
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* starts with [yY], otherwise return 0.
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*/
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int read_yesno(void);
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/**
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* Get a file corresponding to a preset file.
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*
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* If is_path is non-zero, look for the file in the path preset_name.
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* Otherwise search for a file named arg.ffpreset in the directories
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* $FFMPEG_DATADIR (if set), $HOME/.ffmpeg, and in the datadir defined
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* at configuration time or in a "ffpresets" folder along the executable
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* on win32, in that order. If no such file is found and
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* codec_name is defined, then search for a file named
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* codec_name-preset_name.avpreset in the above-mentioned directories.
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*
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* @param filename buffer where the name of the found filename is written
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* @param filename_size size in bytes of the filename buffer
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* @param preset_name name of the preset to search
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* @param is_path tell if preset_name is a filename path
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* @param codec_name name of the codec for which to look for the
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* preset, may be NULL
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*/
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FILE *get_preset_file(char *filename, size_t filename_size,
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const char *preset_name, int is_path, const char *codec_name);
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/**
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* Realloc array to hold new_size elements of elem_size.
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*
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* @param array pointer to the array to reallocate, will be updated
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* with a new pointer on success
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* @param elem_size size in bytes of each element
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* @param size new element count will be written here
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* @param new_size number of elements to place in reallocated array
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* @return a non-negative number on success, a negative error code on failure
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*/
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int grow_array(void **array, int elem_size, int *size, int new_size);
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/**
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* Atomically add a new element to an array of pointers, i.e. allocate
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* a new entry, reallocate the array of pointers and make the new last
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* member of this array point to the newly allocated buffer.
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*
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* @param array array of pointers to reallocate
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* @param elem_size size of the new element to allocate
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* @param nb_elems pointer to the number of elements of the array array;
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* *nb_elems will be incremented by one by this function.
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* @return pointer to the newly allocated entry or NULL on failure
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*/
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void *allocate_array_elem(void *array, size_t elem_size, int *nb_elems);
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#define GROW_ARRAY(array, nb_elems)\
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grow_array((void**)&array, sizeof(*array), &nb_elems, nb_elems + 1)
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#define GET_PIX_FMT_NAME(pix_fmt)\
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const char *name = av_get_pix_fmt_name(pix_fmt);
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#define GET_CODEC_NAME(id)\
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const char *name = avcodec_descriptor_get(id)->name;
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#define GET_SAMPLE_FMT_NAME(sample_fmt)\
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const char *name = av_get_sample_fmt_name(sample_fmt)
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#define GET_SAMPLE_RATE_NAME(rate)\
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char name[16];\
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snprintf(name, sizeof(name), "%d", rate);
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double get_rotation(const int32_t *displaymatrix);
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/* read file contents into a string */
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char *file_read(const char *filename);
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/* Remove keys in dictionary b from dictionary a */
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void remove_avoptions(AVDictionary **a, AVDictionary *b);
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/* Check if any keys exist in dictionary m */
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int check_avoptions(AVDictionary *m);
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#endif /* FFTOOLS_CMDUTILS_H */
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