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 static const AVOption *opt_find(void *obj, const char *name, const char *unit, int opt_flags, int search_flags)
38 AVFormatContext *s = obj;
39 AVInputFormat *ifmt = NULL;
40 AVOutputFormat *ofmt = NULL;
41 if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ) && s->priv_data) {
42 if ((s->iformat && !s->iformat->priv_class) ||
43 (s->oformat && !s->oformat->priv_class))
45 return av_opt_find(s->priv_data, name, unit, opt_flags, search_flags);
48 while ((ifmt = av_iformat_next(ifmt))) {
51 if (ifmt->priv_class && (o = av_opt_find(&ifmt->priv_class, name, unit, opt_flags, search_flags)))
54 while ((ofmt = av_oformat_next(ofmt))) {
57 if (ofmt->priv_class && (o = av_opt_find(&ofmt->priv_class, name, unit, opt_flags, search_flags)))
63 #define OFFSET(x) offsetof(AVFormatContext,x)
64 #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
65 //these names are too long to be readable
66 #define E AV_OPT_FLAG_ENCODING_PARAM
67 #define D AV_OPT_FLAG_DECODING_PARAM
69 static const AVOption options[]={
70 {"probesize", "set probing size", OFFSET(probesize), FF_OPT_TYPE_INT, {.dbl = 5000000 }, 32, INT_MAX, D},
71 {"muxrate", "set mux rate", OFFSET(mux_rate), FF_OPT_TYPE_INT, {.dbl = DEFAULT }, 0, INT_MAX, E},
72 {"packetsize", "set packet size", OFFSET(packet_size), FF_OPT_TYPE_INT, {.dbl = DEFAULT }, 0, INT_MAX, E},
73 {"fflags", NULL, OFFSET(flags), FF_OPT_TYPE_FLAGS, {.dbl = DEFAULT }, INT_MIN, INT_MAX, D|E, "fflags"},
74 {"ignidx", "ignore index", 0, FF_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_IGNIDX }, INT_MIN, INT_MAX, D, "fflags"},
75 {"genpts", "generate pts", 0, FF_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_GENPTS }, INT_MIN, INT_MAX, D, "fflags"},
76 {"nofillin", "do not fill in missing values that can be exactly calculated", 0, FF_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_NOFILLIN }, INT_MIN, INT_MAX, D, "fflags"},
77 {"noparse", "disable AVParsers, this needs nofillin too", 0, FF_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_NOPARSE }, INT_MIN, INT_MAX, D, "fflags"},
78 {"igndts", "ignore dts", 0, FF_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_IGNDTS }, INT_MIN, INT_MAX, D, "fflags"},
79 #if FF_API_FLAG_RTP_HINT
80 {"rtphint", "add rtp hinting (deprecated, use the -movflags rtphint option instead)", 0, FF_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_RTP_HINT }, INT_MIN, INT_MAX, E, "fflags"},
82 {"discardcorrupt", "discard corrupted frames", 0, FF_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_DISCARD_CORRUPT }, INT_MIN, INT_MAX, D, "fflags"},
83 {"sortdts", "try to interleave outputted packets by dts", 0, FF_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_SORT_DTS }, INT_MIN, INT_MAX, D, "fflags"},
84 {"keepside", "dont merge side data", 0, FF_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_KEEP_SIDE_DATA }, INT_MIN, INT_MAX, D, "fflags"},
85 {"latm", "enable RTP MP4A-LATM payload", 0, FF_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_MP4A_LATM }, INT_MIN, INT_MAX, E, "fflags"},
86 {"analyzeduration", "how many microseconds are analyzed to estimate duration", OFFSET(max_analyze_duration), FF_OPT_TYPE_INT, {.dbl = 5*AV_TIME_BASE }, 0, INT_MAX, D},
87 {"cryptokey", "decryption key", OFFSET(key), FF_OPT_TYPE_BINARY, {.dbl = 0}, 0, 0, D},
88 {"indexmem", "max memory used for timestamp index (per stream)", OFFSET(max_index_size), FF_OPT_TYPE_INT, {.dbl = 1<<20 }, 0, INT_MAX, D},
89 {"rtbufsize", "max memory used for buffering real-time frames", OFFSET(max_picture_buffer), FF_OPT_TYPE_INT, {.dbl = 3041280 }, 0, INT_MAX, D}, /* defaults to 1s of 15fps 352x288 YUYV422 video */
90 {"fdebug", "print specific debug info", OFFSET(debug), FF_OPT_TYPE_FLAGS, {.dbl = DEFAULT }, 0, INT_MAX, E|D, "fdebug"},
91 {"ts", NULL, 0, FF_OPT_TYPE_CONST, {.dbl = FF_FDEBUG_TS }, INT_MIN, INT_MAX, E|D, "fdebug"},
92 {"max_delay", "maximum muxing or demuxing delay in microseconds", OFFSET(max_delay), FF_OPT_TYPE_INT, {.dbl = DEFAULT }, 0, INT_MAX, E|D},
93 {"fer", "set error detection aggressivity", OFFSET(error_recognition), FF_OPT_TYPE_INT, {.dbl = FF_ER_CAREFUL }, INT_MIN, INT_MAX, D, "fer"},
94 {"careful", NULL, 0, FF_OPT_TYPE_CONST, {.dbl = FF_ER_CAREFUL }, INT_MIN, INT_MAX, D, "fer"},
95 {"explode", "abort decoding on error recognition", 0, FF_OPT_TYPE_CONST, {.dbl = FF_ER_EXPLODE }, INT_MIN, INT_MAX, D, "fer"},
96 {"fpsprobesize", "number of frames used to probe fps", OFFSET(fps_probe_size), FF_OPT_TYPE_INT, {.dbl = -1}, -1, INT_MAX-1, D},
104 static const AVClass av_format_context_class = {
105 .class_name = "AVFormatContext",
106 .item_name = format_to_name,
108 .version = LIBAVUTIL_VERSION_INT,
109 .opt_find = opt_find,
112 static void avformat_get_context_defaults(AVFormatContext *s)
114 memset(s, 0, sizeof(AVFormatContext));
116 s->av_class = &av_format_context_class;
118 av_opt_set_defaults(s);
121 AVFormatContext *avformat_alloc_context(void)
124 ic = av_malloc(sizeof(AVFormatContext));
126 avformat_get_context_defaults(ic);
130 const AVClass *avformat_get_class(void)
132 return &av_format_context_class;