cmdutils.h

   1 /*
   2  * Various utilities for command line tools
   3  * copyright (c) 2003 Fabrice Bellard
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #ifndef LIBAV_CMDUTILS_H
  23 #define LIBAV_CMDUTILS_H
  24
  25 #include <stdint.h>
  26
  27 #include "libavcodec/avcodec.h"
  28 #include "libavfilter/avfilter.h"
  29 #include "libavformat/avformat.h"
  30 #include "libswscale/swscale.h"
  31
  32 /**
  33  * program name, defined by the program for show_version().
  34  */
  35 extern const char program_name[];
  36
  37 /**
  38  * program birth year, defined by the program for show_banner()
  39  */
  40 extern const int program_birth_year;
  41
  42 extern const char **opt_names;
  43 extern AVCodecContext *avcodec_opts[AVMEDIA_TYPE_NB];
  44 extern AVFormatContext *avformat_opts;
  45 extern struct SwsContext *sws_opts;
  46 extern AVDictionary *format_opts, *codec_opts;
  47
  48 /**
  49  * Initialize the cmdutils option system, in particular
  50  * allocate the *_opts contexts.
  51  */
  52 void init_opts(void);
  53 /**
  54  * Uninitialize the cmdutils option system, in particular
  55  * free the *_opts contexts and their contents.
  56  */
  57 void uninit_opts(void);
  58
  59 /**
  60  * Trivial log callback.
  61  * Only suitable for show_help and similar since it lacks prefix handling.
  62  */
  63 void log_callback_help(void* ptr, int level, const char* fmt, va_list vl);
  64
  65 /**
  66  * Fallback for options that are not explicitly handled, these will be
  67  * parsed through AVOptions.
  68  */
  69 int opt_default(const char *opt, const char *arg);
  70
  71 /**
  72  * Set the libav* libraries log level.
  73  */
  74 int opt_loglevel(const char *opt, const char *arg);
  75
  76 /**
  77  * Limit the execution time.
  78  */
  79 int opt_timelimit(const char *opt, const char *arg);
  80
  81 /**
  82  * Parse a string and return its corresponding value as a double.
  83  * Exit from the application if the string cannot be correctly
  84  * parsed or the corresponding value is invalid.
  85  *
  86  * @param context the context of the value to be set (e.g. the
  87  * corresponding commandline option name)
  88  * @param numstr the string to be parsed
  89  * @param type the type (OPT_INT64 or OPT_FLOAT) as which the
  90  * string should be parsed
  91  * @param min the minimum valid accepted value
  92  * @param max the maximum valid accepted value
  93  */
  94 double parse_number_or_die(const char *context, const char *numstr, int type, double min, double max);
  95
  96 /**
  97  * Parse a string specifying a time and return its corresponding
  98  * value as a number of microseconds. Exit from the application if
  99  * the string cannot be correctly parsed.
 100  *
 101  * @param context the context of the value to be set (e.g. the
 102  * corresponding commandline option name)
 103  * @param timestr the string to be parsed
 104  * @param is_duration a flag which tells how to interpret timestr, if
 105  * not zero timestr is interpreted as a duration, otherwise as a
 106  * date
 107  *
 108  * @see parse_date()
 109  */
 110 int64_t parse_time_or_die(const char *context, const char *timestr, int is_duration);
 111
 112 typedef struct {
 113     const char *name;
 114     int flags;
 115 #define HAS_ARG    0x0001
 116 #define OPT_BOOL   0x0002
 117 #define OPT_EXPERT 0x0004
 118 #define OPT_STRING 0x0008
 119 #define OPT_VIDEO  0x0010
 120 #define OPT_AUDIO  0x0020
 121 #define OPT_GRAB   0x0040
 122 #define OPT_INT    0x0080
 123 #define OPT_FLOAT  0x0100
 124 #define OPT_SUBTITLE 0x0200
 125 #define OPT_INT64  0x0400
 126 #define OPT_EXIT   0x0800
 127 #define OPT_DATA   0x1000
 128      union {
 129         int *int_arg;
 130         char **str_arg;
 131         float *float_arg;
 132         int (*func_arg)(const char *, const char *);
 133         int64_t *int64_arg;
 134     } u;
 135     const char *help;
 136     const char *argname;
 137 } OptionDef;
 138
 139 void show_help_options(const OptionDef *options, const char *msg, int mask, int value);
 140
 141 /**
 142  * Parse the command line arguments.
 143  * @param options Array with the definitions required to interpret every
 144  * option of the form: -option_name [argument]
 145  * @param parse_arg_function Name of the function called to process every
 146  * argument without a leading option name flag. NULL if such arguments do
 147  * not have to be processed.
 148  */
 149 void parse_options(int argc, char **argv, const OptionDef *options,
 150                    void (* parse_arg_function)(const char*));
 151
 152 void set_context_opts(void *ctx, void *opts_ctx, int flags, AVCodec *codec);
 153
 154 /**
 155  * Filter out options for given codec.
 156  */
 157 AVDictionary *filter_codec_opts(AVDictionary *opts, enum CodecID codec_id, int encoder);
 158
 159 /*
 160  * Setup AVCodecContext options for avformat_find_stream_info.
 161  */
 162 AVDictionary **setup_find_stream_info_opts(AVFormatContext *s);
 163
 164 /**
 165  * Print an error message to stderr, indicating filename and a human
 166  * readable description of the error code err.
 167  *
 168  * If strerror_r() is not available the use of this function in a
 169  * multithreaded application may be unsafe.
 170  *
 171  * @see av_strerror()
 172  */
 173 void print_error(const char *filename, int err);
 174
 175 /**
 176  * Print the program banner to stderr. The banner contents depend on the
 177  * current version of the repository and of the libav* libraries used by
 178  * the program.
 179  */
 180 void show_banner(void);
 181
 182 /**
 183  * Print the version of the program to stdout. The version message
 184  * depends on the current versions of the repository and of the libav*
 185  * libraries.
 186  */
 187 void show_version(void);
 188
 189 /**
 190  * Print the license of the program to stdout. The license depends on
 191  * the license of the libraries compiled into the program.
 192  */
 193 void show_license(void);
 194
 195 /**
 196  * Print a listing containing all the formats supported by the
 197  * program.
 198  */
 199 void show_formats(void);
 200
 201 /**
 202  * Print a listing containing all the codecs supported by the
 203  * program.
 204  */
 205 void show_codecs(void);
 206
 207 /**
 208  * Print a listing containing all the filters supported by the
 209  * program.
 210  */
 211 void show_filters(void);
 212
 213 /**
 214  * Print a listing containing all the bit stream filters supported by the
 215  * program.
 216  */
 217 void show_bsfs(void);
 218
 219 /**
 220  * Print a listing containing all the protocols supported by the
 221  * program.
 222  */
 223 void show_protocols(void);
 224
 225 /**
 226  * Print a listing containing all the pixel formats supported by the
 227  * program.
 228  */
 229 void show_pix_fmts(void);
 230
 231 /**
 232  * Return a positive value if a line read from standard input
 233  * starts with [yY], otherwise return 0.
 234  */
 235 int read_yesno(void);
 236
 237 /**
 238  * Read the file with name filename, and put its content in a newly
 239  * allocated 0-terminated buffer.
 240  *
 241  * @param bufptr location where pointer to buffer is returned
 242  * @param size   location where size of buffer is returned
 243  * @return 0 in case of success, a negative value corresponding to an
 244  * AVERROR error code in case of failure.
 245  */
 246 int read_file(const char *filename, char **bufptr, size_t *size);
 247
 248 typedef struct {
 249     int64_t num_faulty_pts; /// Number of incorrect PTS values so far
 250     int64_t num_faulty_dts; /// Number of incorrect DTS values so far
 251     int64_t last_pts;       /// PTS of the last frame
 252     int64_t last_dts;       /// DTS of the last frame
 253 } PtsCorrectionContext;
 254
 255 /**
 256  * Reset the state of the PtsCorrectionContext.
 257  */
 258 void init_pts_correction(PtsCorrectionContext *ctx);
 259
 260 /**
 261  * Attempt to guess proper monotonic timestamps for decoded video frames
 262  * which might have incorrect times. Input timestamps may wrap around, in
 263  * which case the output will as well.
 264  *
 265  * @param pts the pts field of the decoded AVPacket, as passed through
 266  * AVCodecContext.reordered_opaque
 267  * @param dts the dts field of the decoded AVPacket
 268  * @return one of the input values, may be AV_NOPTS_VALUE
 269  */
 270 int64_t guess_correct_pts(PtsCorrectionContext *ctx, int64_t pts, int64_t dts);
 271
 272 /**
 273  * Get a file corresponding to a preset file.
 274  *
 275  * If is_path is non-zero, look for the file in the path preset_name.
 276  * Otherwise search for a file named arg.ffpreset in the directories
 277  * $FFMPEG_DATADIR (if set), $HOME/.ffmpeg, and in the datadir defined
 278  * at configuration time, in that order. If no such file is found and
 279  * codec_name is defined, then search for a file named
 280  * codec_name-preset_name.ffpreset in the above-mentioned directories.
 281  *
 282  * @param filename buffer where the name of the found filename is written
 283  * @param filename_size size in bytes of the filename buffer
 284  * @param preset_name name of the preset to search
 285  * @param is_path tell if preset_name is a filename path
 286  * @param codec_name name of the codec for which to look for the
 287  * preset, may be NULL
 288  */
 289 FILE *get_preset_file(char *filename, size_t filename_size,
 290                       const char *preset_name, int is_path, const char *codec_name);
 291
 292 typedef struct {
 293     enum PixelFormat pix_fmt;
 294 } FFSinkContext;
 295
 296 extern AVFilter ffsink;
 297
 298 /**
 299  * Extract a frame from sink.
 300  *
 301  * @return a negative error in case of failure, 1 if one frame has
 302  * been extracted successfully.
 303  */
 304 int get_filtered_video_frame(AVFilterContext *sink, AVFrame *frame,
 305                              AVFilterBufferRef **picref, AVRational *pts_tb);
 306
 307 #endif /* LIBAV_CMDUTILS_H */