libavformat/options.c

   1 /*
   2  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
   3  *
   4  * This file is part of FFmpeg.
   5  *
   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.
  10  *
  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.
  15  *
  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
  19  */
  20 #include "avformat.h"
  21 #include "libavcodec/opt.h"
  22
  23 /**
  24  * @file libavformat/options.c
  25  * Options definition for AVFormatContext.
  26  */
  27
  28 static const char* format_to_name(void* ptr)
  29 {
  30     AVFormatContext* fc = (AVFormatContext*) ptr;
  31     if(fc->iformat) return fc->iformat->name;
  32     else if(fc->oformat) return fc->oformat->name;
  33     else return "NULL";
  34 }
  35
  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
  41
  42 static const AVOption options[]={
  43 {"probesize", NULL, OFFSET(probesize), FF_OPT_TYPE_INT, 32000, 32, INT_MAX, D}, /* 32000 from mpegts.c: 1.0 second at 24Mbit/s */
  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 #if LIBAVFORMAT_VERSION_INT < (53<<16)
  50 {"track", " set the track number", OFFSET(track), FF_OPT_TYPE_INT, DEFAULT, 0, INT_MAX, E},
  51 {"year", "set the year", OFFSET(year), FF_OPT_TYPE_INT, DEFAULT, INT_MIN, INT_MAX, E},
  52 #endif
  53 {"analyzeduration", "how many microseconds are analyzed to estimate duration", OFFSET(max_analyze_duration), FF_OPT_TYPE_INT, 3*AV_TIME_BASE, 0, INT_MAX, D},
  54 {"cryptokey", "decryption key", OFFSET(key), FF_OPT_TYPE_BINARY, 0, 0, 0, D},
  55 {"indexmem", "max memory used for timestamp index (per stream)", OFFSET(max_index_size), FF_OPT_TYPE_INT, 1<<20, 0, INT_MAX, D},
  56 {"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 */
  57 {"fdebug", "print specific debug info", OFFSET(debug), FF_OPT_TYPE_FLAGS, DEFAULT, 0, INT_MAX, E|D, "fdebug"},
  58 {"ts", NULL, 0, FF_OPT_TYPE_CONST, FF_FDEBUG_TS, INT_MIN, INT_MAX, E|D, "fdebug"},
  59 {NULL},
  60 };
  61
  62 #undef E
  63 #undef D
  64 #undef DEFAULT
  65
  66 static const AVClass av_format_context_class = { "AVFormatContext", format_to_name, options };
  67
  68 static void avformat_get_context_defaults(AVFormatContext *s)
  69 {
  70     memset(s, 0, sizeof(AVFormatContext));
  71
  72     s->av_class = &av_format_context_class;
  73
  74     av_opt_set_defaults(s);
  75 }
  76
  77 AVFormatContext *avformat_alloc_context(void)
  78 {
  79     AVFormatContext *ic;
  80     ic = av_malloc(sizeof(AVFormatContext));
  81     if (!ic) return ic;
  82     avformat_get_context_defaults(ic);
  83     ic->av_class = &av_format_context_class;
  84     return ic;
  85 }
  86
  87 #if LIBAVFORMAT_VERSION_MAJOR < 53
  88 AVFormatContext *av_alloc_format_context(void)
  89 {
  90     return avformat_alloc_context();
  91 }
  92 #endif