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25c32d082b
On Windows/MinGW the SDL cflags re-define the main() function, which results in a linking error if the define is not undeffed. Since the addition of the SDL output device, SDL cflags are used also for compiling ffmpeg and ffprobe, so we need to move this trick from ffplay.c to a common header. Fix trac issue #256.
279 lines
8.1 KiB
C
279 lines
8.1 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 FFMPEG_CMDUTILS_H
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#define FFMPEG_CMDUTILS_H
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#include <stdint.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 __MINGW32__
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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 const char **opt_names;
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extern AVCodecContext *avcodec_opts[AVMEDIA_TYPE_NB];
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extern AVFormatContext *avformat_opts;
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extern struct SwsContext *sws_opts;
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/**
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* Initialize the cmdutils option system, in particular
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* allocate the *_opts contexts.
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*/
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void init_opts(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 show_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(const char *opt, const char *arg);
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/**
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* Set the libav* libraries log level.
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*/
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int opt_loglevel(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(const char *opt, const char *arg);
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/**
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* Parse a string and return its corresponding value as a double.
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* Exit from the application if the string cannot be correctly
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* parsed or the corresponding value is invalid.
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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 commandline 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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double parse_number_or_die(const char *context, const char *numstr, int type, double min, double max);
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/**
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* Parse a string specifying a time and return its corresponding
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* value as a number of microseconds. Exit from the application if
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* the string cannot be correctly parsed.
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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 commandline option name)
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* @param timestr the string to be parsed
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* @param is_duration a flag which tells how to interpret timestr, if
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* not zero timestr is interpreted as a duration, otherwise as a
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* date
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*
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* @see parse_date()
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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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typedef struct {
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const char *name;
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int flags;
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#define HAS_ARG 0x0001
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#define OPT_BOOL 0x0002
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#define OPT_EXPERT 0x0004
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#define OPT_STRING 0x0008
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#define OPT_VIDEO 0x0010
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#define OPT_AUDIO 0x0020
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#define OPT_GRAB 0x0040
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#define OPT_INT 0x0080
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#define OPT_FLOAT 0x0100
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#define OPT_SUBTITLE 0x0200
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#define OPT_INT64 0x0400
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#define OPT_EXIT 0x0800
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#define OPT_DATA 0x1000
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#define OPT_DUMMY 0x2000
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union {
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int *int_arg;
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char **str_arg;
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float *float_arg;
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int (*func_arg)(const char *, const char *);
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int64_t *int64_arg;
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} u;
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const char *help;
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const char *argname;
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} OptionDef;
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void show_help_options(const OptionDef *options, const char *msg, int mask, int value);
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/**
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* Parse the 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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void parse_options(int argc, char **argv, const OptionDef *options,
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void (* parse_arg_function)(const char*));
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void set_context_opts(void *ctx, void *opts_ctx, int flags, AVCodec *codec);
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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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void print_error(const char *filename, int err);
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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(void);
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/**
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* Print the version of the program to stdout. The version message
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* depends on the current versions of the repository and of the libav*
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* libraries.
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*/
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void show_version(void);
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/**
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* Print the license of the program to stdout. The license depends on
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* the license of the libraries compiled into the program.
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*/
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void show_license(void);
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/**
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* Print a listing containing all the formats supported by the
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* program.
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*/
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void show_formats(void);
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/**
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* Print a listing containing all the codecs supported by the
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* program.
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*/
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void show_codecs(void);
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/**
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* Print a listing containing all the filters supported by the
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* program.
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*/
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void show_filters(void);
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/**
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* Print a listing containing all the bit stream filters supported by the
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* program.
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*/
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void show_bsfs(void);
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/**
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* Print a listing containing all the protocols supported by the
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* program.
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*/
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void show_protocols(void);
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/**
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* Print a listing containing all the pixel formats supported by the
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* program.
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*/
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void show_pix_fmts(void);
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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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* Read the file with name filename, and put its content in a newly
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* allocated 0-terminated buffer.
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*
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* @param bufptr location where pointer to buffer is returned
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* @param size location where size of buffer is returned
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* @return 0 in case of success, a negative value corresponding to an
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* AVERROR error code in case of failure.
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*/
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int read_file(const char *filename, char **bufptr, size_t *size);
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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.ffpreset 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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typedef struct {
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enum PixelFormat pix_fmt;
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} FFSinkContext;
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extern AVFilter ffsink;
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/**
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* Extract a frame from sink.
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*
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* @return a negative error in case of failure, 1 if one frame has
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* been extracted successfully.
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*/
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int get_filtered_video_frame(AVFilterContext *sink, AVFrame *frame,
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AVFilterBufferRef **picref, AVRational *pts_tb);
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#endif /* FFMPEG_CMDUTILS_H */
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