| 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 "avio_internal.h" |
| 22 | #include "internal.h" |
| 23 | #include "libavutil/opt.h" |
| 24 | |
| 25 | /** |
| 26 | * @file |
| 27 | * Options definition for AVFormatContext. |
| 28 | */ |
| 29 | |
| 30 | #include "options_table.h" |
| 31 | |
| 32 | static const char* format_to_name(void* ptr) |
| 33 | { |
| 34 | AVFormatContext* fc = (AVFormatContext*) ptr; |
| 35 | if(fc->iformat) return fc->iformat->name; |
| 36 | else if(fc->oformat) return fc->oformat->name; |
| 37 | else return "NULL"; |
| 38 | } |
| 39 | |
| 40 | static void *format_child_next(void *obj, void *prev) |
| 41 | { |
| 42 | AVFormatContext *s = obj; |
| 43 | if (!prev && s->priv_data && |
| 44 | ((s->iformat && s->iformat->priv_class) || |
| 45 | s->oformat && s->oformat->priv_class)) |
| 46 | return s->priv_data; |
| 47 | if (s->pb && s->pb->av_class && prev != s->pb) |
| 48 | return s->pb; |
| 49 | return NULL; |
| 50 | } |
| 51 | |
| 52 | static const AVClass *format_child_class_next(const AVClass *prev) |
| 53 | { |
| 54 | AVInputFormat *ifmt = NULL; |
| 55 | AVOutputFormat *ofmt = NULL; |
| 56 | |
| 57 | if (!prev) |
| 58 | return &ffio_url_class; |
| 59 | |
| 60 | while ((ifmt = av_iformat_next(ifmt))) |
| 61 | if (ifmt->priv_class == prev) |
| 62 | break; |
| 63 | |
| 64 | if (!ifmt) |
| 65 | while ((ofmt = av_oformat_next(ofmt))) |
| 66 | if (ofmt->priv_class == prev) |
| 67 | break; |
| 68 | if (!ofmt) |
| 69 | while (ifmt = av_iformat_next(ifmt)) |
| 70 | if (ifmt->priv_class) |
| 71 | return ifmt->priv_class; |
| 72 | |
| 73 | while (ofmt = av_oformat_next(ofmt)) |
| 74 | if (ofmt->priv_class) |
| 75 | return ofmt->priv_class; |
| 76 | |
| 77 | return NULL; |
| 78 | } |
| 79 | |
| 80 | static AVClassCategory get_category(void *ptr) |
| 81 | { |
| 82 | AVFormatContext* s = ptr; |
| 83 | if(s->iformat) return AV_CLASS_CATEGORY_DEMUXER; |
| 84 | else return AV_CLASS_CATEGORY_MUXER; |
| 85 | } |
| 86 | |
| 87 | static const AVClass av_format_context_class = { |
| 88 | .class_name = "AVFormatContext", |
| 89 | .item_name = format_to_name, |
| 90 | .option = avformat_options, |
| 91 | .version = LIBAVUTIL_VERSION_INT, |
| 92 | .child_next = format_child_next, |
| 93 | .child_class_next = format_child_class_next, |
| 94 | .category = AV_CLASS_CATEGORY_MUXER, |
| 95 | .get_category = get_category, |
| 96 | }; |
| 97 | |
| 98 | static void avformat_get_context_defaults(AVFormatContext *s) |
| 99 | { |
| 100 | memset(s, 0, sizeof(AVFormatContext)); |
| 101 | |
| 102 | s->av_class = &av_format_context_class; |
| 103 | |
| 104 | av_opt_set_defaults(s); |
| 105 | } |
| 106 | |
| 107 | AVFormatContext *avformat_alloc_context(void) |
| 108 | { |
| 109 | AVFormatContext *ic; |
| 110 | ic = av_malloc(sizeof(AVFormatContext)); |
| 111 | if (!ic) return ic; |
| 112 | avformat_get_context_defaults(ic); |
| 113 | ic->offset = AV_NOPTS_VALUE; |
| 114 | |
| 115 | ic->internal = av_mallocz(sizeof(*ic->internal)); |
| 116 | if (!ic->internal) { |
| 117 | avformat_free_context(ic); |
| 118 | return NULL; |
| 119 | } |
| 120 | |
| 121 | return ic; |
| 122 | } |
| 123 | |
| 124 | enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext* ctx) |
| 125 | { |
| 126 | return ctx->duration_estimation_method; |
| 127 | } |
| 128 | |
| 129 | const AVClass *avformat_get_class(void) |
| 130 | { |
| 131 | return &av_format_context_class; |
| 132 | } |