2 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #include "libavutil/opt.h"
25 * Options definition for AVFormatContext.
28 static const char* format_to_name(void* ptr)
30 AVFormatContext* fc = (AVFormatContext*) ptr;
31 if(fc->iformat) return fc->iformat->name;
32 else if(fc->oformat) return fc->oformat->name;
36 #define OFFSET(x) offsetof(AVFormatContext,x)
37 #define DEFAULT 0 //should be NAN but it does not work as it is not a constant in glibc as required by ANSI/ISO C
38 //these names are too long to be readable
39 #define E AV_OPT_FLAG_ENCODING_PARAM
40 #define D AV_OPT_FLAG_DECODING_PARAM
42 static const AVOption options[]={
43 {"probesize", "set probing size", OFFSET(probesize), FF_OPT_TYPE_INT, 5000000, 32, INT_MAX, D},
44 {"muxrate", "set mux rate", OFFSET(mux_rate), FF_OPT_TYPE_INT, DEFAULT, 0, INT_MAX, E},
45 {"packetsize", "set packet size", OFFSET(packet_size), FF_OPT_TYPE_INT, DEFAULT, 0, INT_MAX, E},
46 {"fflags", NULL, OFFSET(flags), FF_OPT_TYPE_FLAGS, DEFAULT, INT_MIN, INT_MAX, D|E, "fflags"},
47 {"ignidx", "ignore index", 0, FF_OPT_TYPE_CONST, AVFMT_FLAG_IGNIDX, INT_MIN, INT_MAX, D, "fflags"},
48 {"genpts", "generate pts", 0, FF_OPT_TYPE_CONST, AVFMT_FLAG_GENPTS, INT_MIN, INT_MAX, D, "fflags"},
49 {"nofillin", "do not fill in missing values that can be exactly calculated", 0, FF_OPT_TYPE_CONST, AVFMT_FLAG_NOFILLIN, INT_MIN, INT_MAX, D, "fflags"},
50 {"noparse", "disable AVParsers, this needs nofillin too", 0, FF_OPT_TYPE_CONST, AVFMT_FLAG_NOPARSE, INT_MIN, INT_MAX, D, "fflags"},
51 {"igndts", "ignore dts", 0, FF_OPT_TYPE_CONST, AVFMT_FLAG_IGNDTS, INT_MIN, INT_MAX, D, "fflags"},
52 {"rtphint", "add rtp hinting", 0, FF_OPT_TYPE_CONST, AVFMT_FLAG_RTP_HINT, INT_MIN, INT_MAX, E, "fflags"},
53 #if FF_API_OLD_METADATA
54 {"track", " set the track number", OFFSET(track), FF_OPT_TYPE_INT, DEFAULT, 0, INT_MAX, E},
55 {"year", "set the year", OFFSET(year), FF_OPT_TYPE_INT, DEFAULT, INT_MIN, INT_MAX, E},
57 {"analyzeduration", "how many microseconds are analyzed to estimate duration", OFFSET(max_analyze_duration), FF_OPT_TYPE_INT, 5*AV_TIME_BASE, 0, INT_MAX, D},
58 {"cryptokey", "decryption key", OFFSET(key), FF_OPT_TYPE_BINARY, 0, 0, 0, D},
59 {"indexmem", "max memory used for timestamp index (per stream)", OFFSET(max_index_size), FF_OPT_TYPE_INT, 1<<20, 0, INT_MAX, D},
60 {"rtbufsize", "max memory used for buffering real-time frames", OFFSET(max_picture_buffer), FF_OPT_TYPE_INT, 3041280, 0, INT_MAX, D}, /* defaults to 1s of 15fps 352x288 YUYV422 video */
61 {"fdebug", "print specific debug info", OFFSET(debug), FF_OPT_TYPE_FLAGS, DEFAULT, 0, INT_MAX, E|D, "fdebug"},
62 {"ts", NULL, 0, FF_OPT_TYPE_CONST, FF_FDEBUG_TS, INT_MIN, INT_MAX, E|D, "fdebug"},
63 {"max_delay", "maximum muxing or demuxing delay in microseconds", OFFSET(max_delay), FF_OPT_TYPE_INT, DEFAULT, 0, INT_MAX, E|D},
71 static const AVClass av_format_context_class = { "AVFormatContext", format_to_name, options, LIBAVUTIL_VERSION_INT };
73 static void avformat_get_context_defaults(AVFormatContext *s)
75 memset(s, 0, sizeof(AVFormatContext));
77 s->av_class = &av_format_context_class;
79 av_opt_set_defaults(s);
82 AVFormatContext *avformat_alloc_context(void)
85 ic = av_malloc(sizeof(AVFormatContext));
87 avformat_get_context_defaults(ic);
88 ic->av_class = &av_format_context_class;
92 #if FF_API_ALLOC_FORMAT_CONTEXT
93 AVFormatContext *av_alloc_format_context(void)
95 return avformat_alloc_context();