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error.h
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 /**
20  * @file
21  * error code definitions
22  */
23 
24 #ifndef AVUTIL_ERROR_H
25 #define AVUTIL_ERROR_H
26 
27 #include <errno.h>
28 #include <stddef.h>
29 
30 /**
31  * @addtogroup lavu_error
32  *
33  * @{
34  */
35 
36 
37 /* error handling */
38 #if EDOM > 0
39 #define AVERROR(e) (-(e)) ///< Returns a negative error code from a POSIX error code, to return from library functions.
40 #define AVUNERROR(e) (-(e)) ///< Returns a POSIX error code from a library function error return value.
41 #else
42 /* Some platforms have E* and errno already negated. */
43 #define AVERROR(e) (e)
44 #define AVUNERROR(e) (e)
45 #endif
46 
47 #define FFERRTAG(a, b, c, d) (-(int)MKTAG(a, b, c, d))
48 
49 #define AVERROR_BSF_NOT_FOUND FFERRTAG(0xF8,'B','S','F') ///< Bitstream filter not found
50 #define AVERROR_BUG FFERRTAG( 'B','U','G','!') ///< Internal bug, also see AVERROR_BUG2
51 #define AVERROR_BUFFER_TOO_SMALL FFERRTAG( 'B','U','F','S') ///< Buffer too small
52 #define AVERROR_DECODER_NOT_FOUND FFERRTAG(0xF8,'D','E','C') ///< Decoder not found
53 #define AVERROR_DEMUXER_NOT_FOUND FFERRTAG(0xF8,'D','E','M') ///< Demuxer not found
54 #define AVERROR_ENCODER_NOT_FOUND FFERRTAG(0xF8,'E','N','C') ///< Encoder not found
55 #define AVERROR_EOF FFERRTAG( 'E','O','F',' ') ///< End of file
56 #define AVERROR_EXIT FFERRTAG( 'E','X','I','T') ///< Immediate exit was requested; the called function should not be restarted
57 #define AVERROR_EXTERNAL FFERRTAG( 'E','X','T',' ') ///< Generic error in an external library
58 #define AVERROR_FILTER_NOT_FOUND FFERRTAG(0xF8,'F','I','L') ///< Filter not found
59 #define AVERROR_INVALIDDATA FFERRTAG( 'I','N','D','A') ///< Invalid data found when processing input
60 #define AVERROR_MUXER_NOT_FOUND FFERRTAG(0xF8,'M','U','X') ///< Muxer not found
61 #define AVERROR_OPTION_NOT_FOUND FFERRTAG(0xF8,'O','P','T') ///< Option not found
62 #define AVERROR_PATCHWELCOME FFERRTAG( 'P','A','W','E') ///< Not yet implemented in FFmpeg, patches welcome
63 #define AVERROR_PROTOCOL_NOT_FOUND FFERRTAG(0xF8,'P','R','O') ///< Protocol not found
64 
65 #define AVERROR_STREAM_NOT_FOUND FFERRTAG(0xF8,'S','T','R') ///< Stream not found
66 /**
67  * This is semantically identical to AVERROR_BUG
68  * it has been introduced in Libav after our AVERROR_BUG and with a modified value.
69  */
70 #define AVERROR_BUG2 FFERRTAG( 'B','U','G',' ')
71 #define AVERROR_UNKNOWN FFERRTAG( 'U','N','K','N') ///< Unknown error, typically from an external library
72 #define AVERROR_EXPERIMENTAL (-0x2bb2afa8) ///< Requested feature is flagged experimental. Set strict_std_compliance if you really want to use it.
73 #define AVERROR_INPUT_CHANGED (-0x636e6701) ///< Input changed between calls. Reconfiguration is required. (can be OR-ed with AVERROR_OUTPUT_CHANGED)
74 #define AVERROR_OUTPUT_CHANGED (-0x636e6702) ///< Output changed between calls. Reconfiguration is required. (can be OR-ed with AVERROR_INPUT_CHANGED)
75 /* HTTP & RTSP errors */
76 #define AVERROR_HTTP_BAD_REQUEST FFERRTAG(0xF8,'4','0','0')
77 #define AVERROR_HTTP_UNAUTHORIZED FFERRTAG(0xF8,'4','0','1')
78 #define AVERROR_HTTP_FORBIDDEN FFERRTAG(0xF8,'4','0','3')
79 #define AVERROR_HTTP_NOT_FOUND FFERRTAG(0xF8,'4','0','4')
80 #define AVERROR_HTTP_OTHER_4XX FFERRTAG(0xF8,'4','X','X')
81 #define AVERROR_HTTP_SERVER_ERROR FFERRTAG(0xF8,'5','X','X')
82 
83 #define AV_ERROR_MAX_STRING_SIZE 64
84 
85 /**
86  * Put a description of the AVERROR code errnum in errbuf.
87  * In case of failure the global variable errno is set to indicate the
88  * error. Even in case of failure av_strerror() will print a generic
89  * error message indicating the errnum provided to errbuf.
90  *
91  * @param errnum error code to describe
92  * @param errbuf buffer to which description is written
93  * @param errbuf_size the size in bytes of errbuf
94  * @return 0 on success, a negative value if a description for errnum
95  * cannot be found
96  */
97 int av_strerror(int errnum, char *errbuf, size_t errbuf_size);
98 
99 /**
100  * Fill the provided buffer with a string containing an error string
101  * corresponding to the AVERROR code errnum.
102  *
103  * @param errbuf a buffer
104  * @param errbuf_size size in bytes of errbuf
105  * @param errnum error code to describe
106  * @return the buffer in input, filled with the error description
107  * @see av_strerror()
108  */
109 static inline char *av_make_error_string(char *errbuf, size_t errbuf_size, int errnum)
110 {
111  av_strerror(errnum, errbuf, errbuf_size);
112  return errbuf;
113 }
114 
115 /**
116  * Convenience macro, the return value should be used only directly in
117  * function arguments but never stand-alone.
118  */
119 #define av_err2str(errnum) \
120  av_make_error_string((char[AV_ERROR_MAX_STRING_SIZE]){0}, AV_ERROR_MAX_STRING_SIZE, errnum)
121 
122 /**
123  * @}
124  */
125 
126 #endif /* AVUTIL_ERROR_H */
static char * av_make_error_string(char *errbuf, size_t errbuf_size, int errnum)
Fill the provided buffer with a string containing an error string corresponding to the AVERROR code e...
Definition: error.h:109
int av_strerror(int errnum, char *errbuf, size_t errbuf_size)
Put a description of the AVERROR code errnum in errbuf.
Definition: error.c:105