Libav 0.7.1
|
00001 /* 00002 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard 00003 * 00004 * This file is part of Libav. 00005 * 00006 * Libav is free software; you can redistribute it and/or 00007 * modify it under the terms of the GNU Lesser General Public 00008 * License as published by the Free Software Foundation; either 00009 * version 2.1 of the License, or (at your option) any later version. 00010 * 00011 * Libav is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 * Lesser General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU Lesser General Public 00017 * License along with Libav; if not, write to the Free Software 00018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00019 */ 00020 #include "avformat.h" 00021 #include "libavutil/opt.h" 00022 00028 static const char* format_to_name(void* ptr) 00029 { 00030 AVFormatContext* fc = (AVFormatContext*) ptr; 00031 if(fc->iformat) return fc->iformat->name; 00032 else if(fc->oformat) return fc->oformat->name; 00033 else return "NULL"; 00034 } 00035 00036 static const AVOption *opt_find(void *obj, const char *name, const char *unit, int opt_flags, int search_flags) 00037 { 00038 AVFormatContext *s = obj; 00039 AVInputFormat *ifmt = NULL; 00040 AVOutputFormat *ofmt = NULL; 00041 if (s->priv_data) { 00042 if ((s->iformat && !s->iformat->priv_class) || 00043 (s->oformat && !s->oformat->priv_class)) 00044 return NULL; 00045 return av_opt_find(s->priv_data, name, unit, opt_flags, search_flags); 00046 } 00047 00048 while ((ifmt = av_iformat_next(ifmt))) { 00049 const AVOption *o; 00050 00051 if (ifmt->priv_class && (o = av_opt_find(&ifmt->priv_class, name, unit, opt_flags, search_flags))) 00052 return o; 00053 } 00054 while ((ofmt = av_oformat_next(ofmt))) { 00055 const AVOption *o; 00056 00057 if (ofmt->priv_class && (o = av_opt_find(&ofmt->priv_class, name, unit, opt_flags, search_flags))) 00058 return o; 00059 } 00060 return NULL; 00061 } 00062 00063 #define OFFSET(x) offsetof(AVFormatContext,x) 00064 #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 00065 //these names are too long to be readable 00066 #define E AV_OPT_FLAG_ENCODING_PARAM 00067 #define D AV_OPT_FLAG_DECODING_PARAM 00068 00069 static const AVOption options[]={ 00070 {"probesize", "set probing size", OFFSET(probesize), FF_OPT_TYPE_INT, {.dbl = 5000000 }, 32, INT_MAX, D}, 00071 {"muxrate", "set mux rate", OFFSET(mux_rate), FF_OPT_TYPE_INT, {.dbl = DEFAULT }, 0, INT_MAX, E}, 00072 {"packetsize", "set packet size", OFFSET(packet_size), FF_OPT_TYPE_INT, {.dbl = DEFAULT }, 0, INT_MAX, E}, 00073 {"fflags", NULL, OFFSET(flags), FF_OPT_TYPE_FLAGS, {.dbl = DEFAULT }, INT_MIN, INT_MAX, D|E, "fflags"}, 00074 {"ignidx", "ignore index", 0, FF_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_IGNIDX }, INT_MIN, INT_MAX, D, "fflags"}, 00075 {"genpts", "generate pts", 0, FF_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_GENPTS }, INT_MIN, INT_MAX, D, "fflags"}, 00076 {"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"}, 00077 {"noparse", "disable AVParsers, this needs nofillin too", 0, FF_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_NOPARSE }, INT_MIN, INT_MAX, D, "fflags"}, 00078 {"igndts", "ignore dts", 0, FF_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_IGNDTS }, INT_MIN, INT_MAX, D, "fflags"}, 00079 #if FF_API_FLAG_RTP_HINT 00080 {"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"}, 00081 #endif 00082 {"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}, 00083 {"cryptokey", "decryption key", OFFSET(key), FF_OPT_TYPE_BINARY, {.dbl = 0}, 0, 0, D}, 00084 {"indexmem", "max memory used for timestamp index (per stream)", OFFSET(max_index_size), FF_OPT_TYPE_INT, {.dbl = 1<<20 }, 0, INT_MAX, D}, 00085 {"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 */ 00086 {"fdebug", "print specific debug info", OFFSET(debug), FF_OPT_TYPE_FLAGS, {.dbl = DEFAULT }, 0, INT_MAX, E|D, "fdebug"}, 00087 {"ts", NULL, 0, FF_OPT_TYPE_CONST, {.dbl = FF_FDEBUG_TS }, INT_MIN, INT_MAX, E|D, "fdebug"}, 00088 {"max_delay", "maximum muxing or demuxing delay in microseconds", OFFSET(max_delay), FF_OPT_TYPE_INT, {.dbl = DEFAULT }, 0, INT_MAX, E|D}, 00089 {"fpsprobesize", "number of frames used to probe fps", OFFSET(fps_probe_size), FF_OPT_TYPE_INT, {.dbl = -1}, -1, INT_MAX-1, D}, 00090 {NULL}, 00091 }; 00092 00093 #undef E 00094 #undef D 00095 #undef DEFAULT 00096 00097 static const AVClass av_format_context_class = { 00098 .class_name = "AVFormatContext", 00099 .item_name = format_to_name, 00100 .option = options, 00101 .version = LIBAVUTIL_VERSION_INT, 00102 .opt_find = opt_find, 00103 }; 00104 00105 static void avformat_get_context_defaults(AVFormatContext *s) 00106 { 00107 memset(s, 0, sizeof(AVFormatContext)); 00108 00109 s->av_class = &av_format_context_class; 00110 00111 av_opt_set_defaults(s); 00112 } 00113 00114 AVFormatContext *avformat_alloc_context(void) 00115 { 00116 AVFormatContext *ic; 00117 ic = av_malloc(sizeof(AVFormatContext)); 00118 if (!ic) return ic; 00119 avformat_get_context_defaults(ic); 00120 return ic; 00121 }