ffmpeg: check experimental flag after codec is opened.
[libav.git] / cmdutils.h
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1/*
2 * Various utilities for command line tools
3 * copyright (c) 2003 Fabrice Bellard
4 *
2912e87a 5 * This file is part of Libav.
f5a90186 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
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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 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 18 * License along with Libav; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
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22#ifndef LIBAV_CMDUTILS_H
23#define LIBAV_CMDUTILS_H
01310af2 24
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25#include <stdint.h>
26
95137bbb 27#include "libavcodec/avcodec.h"
ea91e771 28#include "libavfilter/avfilter.h"
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29#include "libavformat/avformat.h"
30#include "libswscale/swscale.h"
f0a838e5 31
60b5a745 32/**
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33 * program name, defined by the program for show_version().
34 */
35extern const char program_name[];
36
37/**
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38 * program birth year, defined by the program for show_banner()
39 */
40extern const int program_birth_year;
41
85663ef3 42extern const char **opt_names;
72415b2a 43extern AVCodecContext *avcodec_opts[AVMEDIA_TYPE_NB];
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44extern AVFormatContext *avformat_opts;
45extern struct SwsContext *sws_opts;
9ba38229 46extern AVDictionary *format_opts, *video_opts, *audio_opts, *sub_opts;
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47
48/**
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49 * Initialize the cmdutils option system, in particular
50 * allocate the *_opts contexts.
51 */
52void init_opts(void);
53/**
54 * Uninitialize the cmdutils option system, in particular
55 * free the *_opts contexts and their contents.
56 */
57void uninit_opts(void);
58
59/**
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60 * Trivial log callback.
61 * Only suitable for show_help and similar since it lacks prefix handling.
62 */
63void log_callback_help(void* ptr, int level, const char* fmt, va_list vl);
64
65/**
b7438896 66 * Fallback for options that are not explicitly handled, these will be
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67 * parsed through AVOptions.
68 */
69int opt_default(const char *opt, const char *arg);
70
ea9c581f 71/**
49bd8e4b 72 * Set the libav* libraries log level.
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73 */
74int opt_loglevel(const char *opt, const char *arg);
75
76/**
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77 * Limit the execution time.
78 */
79int opt_timelimit(const char *opt, const char *arg);
80
81/**
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82 * Parse a string and return its corresponding value as a double.
83 * Exit from the application if the string cannot be correctly
15067504 84 * parsed or the corresponding value is invalid.
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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
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91 * @param min the minimum valid accepted value
92 * @param max the maximum valid accepted value
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93 */
94double parse_number_or_die(const char *context, const char *numstr, int type, double min, double max);
95
7542157d 96/**
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97 * Parse a string specifying a time and return its corresponding
98 * value as a number of microseconds. Exit from the application if
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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
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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
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106 * date
107 *
748061de 108 * @see parse_date()
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109 */
110int64_t parse_time_or_die(const char *context, const char *timestr, int is_duration);
111
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112typedef 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
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119#define OPT_VIDEO 0x0010
120#define OPT_AUDIO 0x0020
121#define OPT_GRAB 0x0040
26d4f26b 122#define OPT_INT 0x0080
394c4d77 123#define OPT_FLOAT 0x0100
ae27975d 124#define OPT_SUBTITLE 0x0200
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125#define OPT_INT64 0x0400
126#define OPT_EXIT 0x0800
127#define OPT_DATA 0x1000
ae27975d 128 union {
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129 int *int_arg;
130 char **str_arg;
1f631450 131 float *float_arg;
26513856 132 int (*func_arg)(const char *, const char *);
ffdf9a1f 133 int64_t *int64_arg;
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134 } u;
135 const char *help;
136 const char *argname;
137} OptionDef;
138
02d504a7 139void show_help_options(const OptionDef *options, const char *msg, int mask, int value);
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140
141/**
49bd8e4b 142 * Parse the command line arguments.
60a9966e 143 * @param options Array with the definitions required to interpret every
0baf34d8 144 * option of the form: -option_name [argument]
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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 */
149void parse_options(int argc, char **argv, const OptionDef *options,
150 void (* parse_arg_function)(const char*));
151
0093ebc2 152void set_context_opts(void *ctx, void *opts_ctx, int flags, AVCodec *codec);
85663ef3 153
8d787f8e 154/**
49bd8e4b 155 * Print an error message to stderr, indicating filename and a human
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156 * readable description of the error code err.
157 *
158 * If strerror_r() is not available the use of this function in a
159 * multithreaded application may be unsafe.
160 *
161 * @see av_strerror()
162 */
01310af2 163void print_error(const char *filename, int err);
c5dc6026 164
f35917b2 165/**
49bd8e4b 166 * Print the program banner to stderr. The banner contents depend on the
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167 * current version of the repository and of the libav* libraries used by
168 * the program.
86074ed1 169 */
ea9c581f 170void show_banner(void);
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171
172/**
49bd8e4b 173 * Print the version of the program to stdout. The version message
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174 * depends on the current versions of the repository and of the libav*
175 * libraries.
86074ed1 176 */
64555bd9 177void show_version(void);
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178
179/**
49bd8e4b 180 * Print the license of the program to stdout. The license depends on
15067504 181 * the license of the libraries compiled into the program.
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182 */
183void show_license(void);
184
ba9880c1 185/**
49bd8e4b 186 * Print a listing containing all the formats supported by the
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187 * program.
188 */
189void show_formats(void);
190
090b61b2 191/**
49bd8e4b 192 * Print a listing containing all the codecs supported by the
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193 * program.
194 */
195void show_codecs(void);
196
197/**
49bd8e4b 198 * Print a listing containing all the filters supported by the
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199 * program.
200 */
201void show_filters(void);
202
203/**
49bd8e4b 204 * Print a listing containing all the bit stream filters supported by the
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205 * program.
206 */
207void show_bsfs(void);
208
209/**
49bd8e4b 210 * Print a listing containing all the protocols supported by the
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211 * program.
212 */
213void show_protocols(void);
214
215/**
49bd8e4b 216 * Print a listing containing all the pixel formats supported by the
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217 * program.
218 */
219void show_pix_fmts(void);
220
221/**
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222 * Return a positive value if a line read from standard input
223 * starts with [yY], otherwise return 0.
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224 */
225int read_yesno(void);
226
458b062d 227/**
49bd8e4b 228 * Read the file with name filename, and put its content in a newly
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229 * allocated 0-terminated buffer.
230 *
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231 * @param bufptr location where pointer to buffer is returned
232 * @param size location where size of buffer is returned
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233 * @return 0 in case of success, a negative value corresponding to an
234 * AVERROR error code in case of failure.
235 */
236int read_file(const char *filename, char **bufptr, size_t *size);
237
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238typedef struct {
239 int64_t num_faulty_pts; /// Number of incorrect PTS values so far
240 int64_t num_faulty_dts; /// Number of incorrect DTS values so far
241 int64_t last_pts; /// PTS of the last frame
242 int64_t last_dts; /// DTS of the last frame
243} PtsCorrectionContext;
244
245/**
f03f30d7 246 * Reset the state of the PtsCorrectionContext.
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247 */
248void init_pts_correction(PtsCorrectionContext *ctx);
249
250/**
f03f30d7 251 * Attempt to guess proper monotonic timestamps for decoded video frames
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252 * which might have incorrect times. Input timestamps may wrap around, in
253 * which case the output will as well.
254 *
f03f30d7 255 * @param pts the pts field of the decoded AVPacket, as passed through
7a8bfa5d 256 * AVCodecContext.reordered_opaque
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257 * @param dts the dts field of the decoded AVPacket
258 * @return one of the input values, may be AV_NOPTS_VALUE
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259 */
260int64_t guess_correct_pts(PtsCorrectionContext *ctx, int64_t pts, int64_t dts);
261
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262/**
263 * Get a file corresponding to a preset file.
264 *
265 * If is_path is non-zero, look for the file in the path preset_name.
266 * Otherwise search for a file named arg.ffpreset in the directories
267 * $FFMPEG_DATADIR (if set), $HOME/.ffmpeg, and in the datadir defined
268 * at configuration time, in that order. If no such file is found and
269 * codec_name is defined, then search for a file named
270 * codec_name-preset_name.ffpreset in the above-mentioned directories.
271 *
272 * @param filename buffer where the name of the found filename is written
273 * @param filename_size size in bytes of the filename buffer
274 * @param preset_name name of the preset to search
275 * @param is_path tell if preset_name is a filename path
276 * @param codec_name name of the codec for which to look for the
277 * preset, may be NULL
278 */
279FILE *get_preset_file(char *filename, size_t filename_size,
280 const char *preset_name, int is_path, const char *codec_name);
281
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282typedef struct {
283 enum PixelFormat pix_fmt;
284} FFSinkContext;
285
286extern AVFilter ffsink;
287
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288/**
289 * Extract a frame from sink.
290 *
291 * @return a negative error in case of failure, 1 if one frame has
292 * been extracted successfully.
293 */
294int get_filtered_video_frame(AVFilterContext *sink, AVFrame *frame,
295 AVFilterBufferRef **picref, AVRational *pts_tb);
296
153382e1 297#endif /* LIBAV_CMDUTILS_H */