/* * Various utilities for command line tools * copyright (c) 2003 Fabrice Bellard * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef LIBAV_CMDUTILS_H #define LIBAV_CMDUTILS_H #include <stdint.h> #include "libavcodec/avcodec.h" #include "libavfilter/avfilter.h" #include "libavformat/avformat.h" #include "libswscale/swscale.h" /** * program name, defined by the program for show_version(). */ extern const char program_name[]; /** * program birth year, defined by the program for show_banner() */ extern const int program_birth_year; extern AVCodecContext *avcodec_opts[AVMEDIA_TYPE_NB]; extern AVFormatContext *avformat_opts; extern struct SwsContext *sws_opts; extern AVDictionary *format_opts, *codec_opts; /** * Initialize the cmdutils option system, in particular * allocate the *_opts contexts. */ void init_opts(void); /** * Uninitialize the cmdutils option system, in particular * free the *_opts contexts and their contents. */ void uninit_opts(void); /** * Trivial log callback. * Only suitable for show_help and similar since it lacks prefix handling. */ void log_callback_help(void* ptr, int level, const char* fmt, va_list vl); /** * Fallback for options that are not explicitly handled, these will be * parsed through AVOptions. */ int opt_default(const char *opt, const char *arg); /** * Set the libav* libraries log level. */ int opt_loglevel(const char *opt, const char *arg); /** * Limit the execution time. */ int opt_timelimit(const char *opt, const char *arg); /** * Parse a string and return its corresponding value as a double. * Exit from the application if the string cannot be correctly * parsed or the corresponding value is invalid. * * @param context the context of the value to be set (e.g. the * corresponding command line option name) * @param numstr the string to be parsed * @param type the type (OPT_INT64 or OPT_FLOAT) as which the * string should be parsed * @param min the minimum valid accepted value * @param max the maximum valid accepted value */ double parse_number_or_die(const char *context, const char *numstr, int type, double min, double max); /** * Parse a string specifying a time and return its corresponding * value as a number of microseconds. Exit from the application if * the string cannot be correctly parsed. * * @param context the context of the value to be set (e.g. the * corresponding command line option name) * @param timestr the string to be parsed * @param is_duration a flag which tells how to interpret timestr, if * not zero timestr is interpreted as a duration, otherwise as a * date * * @see parse_date() */ int64_t parse_time_or_die(const char *context, const char *timestr, int is_duration); typedef struct SpecifierOpt { char *specifier; /**< stream/chapter/program/... specifier */ union { uint8_t *str; int i; int64_t i64; float f; double dbl; } u; } SpecifierOpt; typedef struct { const char *name; int flags; #define HAS_ARG 0x0001 #define OPT_BOOL 0x0002 #define OPT_EXPERT 0x0004 #define OPT_STRING 0x0008 #define OPT_VIDEO 0x0010 #define OPT_AUDIO 0x0020 #define OPT_GRAB 0x0040 #define OPT_INT 0x0080 #define OPT_FLOAT 0x0100 #define OPT_SUBTITLE 0x0200 #define OPT_INT64 0x0400 #define OPT_EXIT 0x0800 #define OPT_DATA 0x1000 #define OPT_FUNC2 0x2000 #define OPT_OFFSET 0x4000 /* option is specified as an offset in a passed optctx */ #define OPT_SPEC 0x8000 /* option is to be stored in an array of SpecifierOpt. Implies OPT_OFFSET. Next element after the offset is an int containing element count in the array. */ #define OPT_TIME 0x10000 #define OPT_DOUBLE 0x20000 union { void *dst_ptr; int (*func_arg)(const char *, const char *); int (*func2_arg)(void *, const char *, const char *); size_t off; } u; const char *help; const char *argname; } OptionDef; void show_help_options(const OptionDef *options, const char *msg, int mask, int value); /** * Show help for all options with given flags in class and all its * children. */ void show_help_children(const AVClass *class, int flags); /** * Parse the command line arguments. * * @param optctx an opaque options context * @param options Array with the definitions required to interpret every * option of the form: -option_name [argument] * @param parse_arg_function Name of the function called to process every * argument without a leading option name flag. NULL if such arguments do * not have to be processed. */ void parse_options(void *optctx, int argc, char **argv, const OptionDef *options, void (* parse_arg_function)(void *optctx, const char*)); /** * Parse one given option. * * @return on success 1 if arg was consumed, 0 otherwise; negative number on error */ int parse_option(void *optctx, const char *opt, const char *arg, const OptionDef *options); /** * Find the '-loglevel' option in the command line args and apply it. */ void parse_loglevel(int argc, char **argv, const OptionDef *options); /** * Return index of option opt in argv or 0 if not found. */ int locate_option(int argc, char **argv, const OptionDef *options, const char *optname); /** * Check if the given stream matches a stream specifier. * * @param s Corresponding format context. * @param st Stream from s to be checked. * @param spec A stream specifier of the [v|a|s|d]:[\<stream index\>] form. * * @return 1 if the stream matches, 0 if it doesn't, <0 on error */ int check_stream_specifier(AVFormatContext *s, AVStream *st, const char *spec); /** * Filter out options for given codec. * * Create a new options dictionary containing only the options from * opts which apply to the codec with ID codec_id. * * @param s Corresponding format context. * @param st A stream from s for which the options should be filtered. * @param codec The particular codec for which the options should be filtered. * If null, the default one is looked up according to the codec id. * @return a pointer to the created dictionary */ AVDictionary *filter_codec_opts(AVDictionary *opts, enum CodecID codec_id, AVFormatContext *s, AVStream *st, AVCodec *codec); /** * Setup AVCodecContext options for avformat_find_stream_info(). * * Create an array of dictionaries, one dictionary for each stream * contained in s. * Each dictionary will contain the options from codec_opts which can * be applied to the corresponding stream codec context. * * @return pointer to the created array of dictionaries, NULL if it * cannot be created */ AVDictionary **setup_find_stream_info_opts(AVFormatContext *s, AVDictionary *codec_opts); /** * Print an error message to stderr, indicating filename and a human * readable description of the error code err. * * If strerror_r() is not available the use of this function in a * multithreaded application may be unsafe. * * @see av_strerror() */ void print_error(const char *filename, int err); /** * Print the program banner to stderr. The banner contents depend on the * current version of the repository and of the libav* libraries used by * the program. */ void show_banner(void); /** * Print the version of the program to stdout. The version message * depends on the current versions of the repository and of the libav* * libraries. */ void show_version(void); /** * Print the license of the program to stdout. The license depends on * the license of the libraries compiled into the program. */ void show_license(void); /** * Print a listing containing all the formats supported by the * program. */ void show_formats(void); /** * Print a listing containing all the codecs supported by the * program. */ void show_codecs(void); /** * Print a listing containing all the filters supported by the * program. */ void show_filters(void); /** * Print a listing containing all the bit stream filters supported by the * program. */ void show_bsfs(void); /** * Print a listing containing all the protocols supported by the * program. */ void show_protocols(void); /** * Print a listing containing all the pixel formats supported by the * program. */ void show_pix_fmts(void); /** * Print a listing containing all the sample formats supported by the * program. */ int show_sample_fmts(const char *opt, const char *arg); /** * Return a positive value if a line read from standard input * starts with [yY], otherwise return 0. */ int read_yesno(void); /** * Read the file with name filename, and put its content in a newly * allocated 0-terminated buffer. * * @param bufptr location where pointer to buffer is returned * @param size location where size of buffer is returned * @return 0 in case of success, a negative value corresponding to an * AVERROR error code in case of failure. */ int cmdutils_read_file(const char *filename, char **bufptr, size_t *size); typedef struct { int64_t num_faulty_pts; /// Number of incorrect PTS values so far int64_t num_faulty_dts; /// Number of incorrect DTS values so far int64_t last_pts; /// PTS of the last frame int64_t last_dts; /// DTS of the last frame } PtsCorrectionContext; /** * Reset the state of the PtsCorrectionContext. */ void init_pts_correction(PtsCorrectionContext *ctx); /** * Attempt to guess proper monotonic timestamps for decoded video frames * which might have incorrect times. Input timestamps may wrap around, in * which case the output will as well. * * @param pts the pts field of the decoded AVPacket, as passed through * AVCodecContext.reordered_opaque * @param dts the dts field of the decoded AVPacket * @return one of the input values, may be AV_NOPTS_VALUE */ int64_t guess_correct_pts(PtsCorrectionContext *ctx, int64_t pts, int64_t dts); /** * Get a file corresponding to a preset file. * * If is_path is non-zero, look for the file in the path preset_name. * Otherwise search for a file named arg.avpreset in the directories * $AVCONV_DATADIR (if set), $HOME/.avconv, and in the datadir defined * at configuration time, in that order. If no such file is found and * codec_name is defined, then search for a file named * codec_name-preset_name.avpreset in the above-mentioned directories. * * @param filename buffer where the name of the found filename is written * @param filename_size size in bytes of the filename buffer * @param preset_name name of the preset to search * @param is_path tell if preset_name is a filename path * @param codec_name name of the codec for which to look for the * preset, may be NULL */ FILE *get_preset_file(char *filename, size_t filename_size, const char *preset_name, int is_path, const char *codec_name); /** * Do all the necessary cleanup and abort. * This function is implemented in the avtools, not cmdutils. */ av_noreturn void exit_program(int ret); /** * Realloc array to hold new_size elements of elem_size. * Calls exit_program() on failure. * * @param elem_size size in bytes of each element * @param size new element count will be written here * @return reallocated array */ void *grow_array(void *array, int elem_size, int *size, int new_size); typedef struct FrameBuffer { uint8_t *base[4]; uint8_t *data[4]; int linesize[4]; int h, w; enum PixelFormat pix_fmt; int refcount; struct FrameBuffer **pool; ///< head of the buffer pool struct FrameBuffer *next; } FrameBuffer; /** * Get a frame from the pool. This is intended to be used as a callback for * AVCodecContext.get_buffer. * * @param s codec context. s->opaque must be a pointer to the head of the * buffer pool. * @param frame frame->opaque will be set to point to the FrameBuffer * containing the frame data. */ int codec_get_buffer(AVCodecContext *s, AVFrame *frame); /** * A callback to be used for AVCodecContext.release_buffer along with * codec_get_buffer(). */ void codec_release_buffer(AVCodecContext *s, AVFrame *frame); /** * A callback to be used for AVFilterBuffer.free. * @param fb buffer to free. fb->priv must be a pointer to the FrameBuffer * containing the buffer data. */ void filter_release_buffer(AVFilterBuffer *fb); /** * Free all the buffers in the pool. This must be called after all the * buffers have been released. */ void free_buffer_pool(FrameBuffer **pool); #endif /* LIBAV_CMDUTILS_H */