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options.c
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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 
24 #include "libavutil/internal.h"
25 #include "libavutil/opt.h"
26 
27 /**
28  * @file
29  * Options definition for AVFormatContext.
30  */
31 
33 #include "options_table.h"
35 
36 static const char* format_to_name(void* ptr)
37 {
39  if(fc->iformat) return fc->iformat->name;
40  else if(fc->oformat) return fc->oformat->name;
41  else return "NULL";
42 }
43 
44 static void *format_child_next(void *obj, void *prev)
45 {
46  AVFormatContext *s = obj;
47  if (!prev && s->priv_data &&
48  ((s->iformat && s->iformat->priv_class) ||
49  s->oformat && s->oformat->priv_class))
50  return s->priv_data;
51  if (s->pb && s->pb->av_class && prev != s->pb)
52  return s->pb;
53  return NULL;
54 }
55 
56 static const AVClass *format_child_class_next(const AVClass *prev)
57 {
58  AVInputFormat *ifmt = NULL;
59  AVOutputFormat *ofmt = NULL;
60 
61  if (!prev)
62  return &ff_avio_class;
63 
64  while ((ifmt = av_iformat_next(ifmt)))
65  if (ifmt->priv_class == prev)
66  break;
67 
68  if (!ifmt)
69  while ((ofmt = av_oformat_next(ofmt)))
70  if (ofmt->priv_class == prev)
71  break;
72  if (!ofmt)
73  while (ifmt = av_iformat_next(ifmt))
74  if (ifmt->priv_class)
75  return ifmt->priv_class;
76 
77  while (ofmt = av_oformat_next(ofmt))
78  if (ofmt->priv_class)
79  return ofmt->priv_class;
80 
81  return NULL;
82 }
83 
84 static AVClassCategory get_category(void *ptr)
85 {
86  AVFormatContext* s = ptr;
87  if(s->iformat) return AV_CLASS_CATEGORY_DEMUXER;
88  else return AV_CLASS_CATEGORY_MUXER;
89 }
90 
92  .class_name = "AVFormatContext",
93  .item_name = format_to_name,
94  .option = avformat_options,
95  .version = LIBAVUTIL_VERSION_INT,
96  .child_next = format_child_next,
97  .child_class_next = format_child_class_next,
99  .get_category = get_category,
100 };
101 
103  const char *url, int flags, AVDictionary **options)
104 {
105 #if FF_API_OLD_OPEN_CALLBACKS
107  if (s->open_cb)
108  return s->open_cb(s, pb, url, flags, &s->interrupt_callback, options);
110 #endif
111 
112  return ffio_open_whitelist(pb, url, flags, &s->interrupt_callback, options, s->protocol_whitelist, s->protocol_blacklist);
113 }
114 
116 {
117  avio_close(pb);
118 }
119 
121 {
122  memset(s, 0, sizeof(AVFormatContext));
123 
125 
128 
130 }
131 
133 {
134  AVFormatContext *ic;
135  ic = av_malloc(sizeof(AVFormatContext));
136  if (!ic) return ic;
138 
139  ic->internal = av_mallocz(sizeof(*ic->internal));
140  if (!ic->internal) {
142  return NULL;
143  }
146 
147  return ic;
148 }
149 
151 {
152  return ctx->duration_estimation_method;
153 }
154 
156 {
157  return &av_format_context_class;
158 }
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:111
static const AVClass av_format_context_class
Definition: options.c:91
AVIOInterruptCB interrupt_callback
Custom interrupt callbacks for the I/O layer.
Definition: avformat.h:1571
AVFormatContext * ctx
Definition: movenc-test.c:48
enum AVDurationEstimationMethod duration_estimation_method
The duration field can be estimated through various ways, and this field can be used to know how the ...
Definition: avformat.h:1680
#define LIBAVUTIL_VERSION_INT
Definition: version.h:70
void av_opt_set_defaults(void *s)
Set the values of all AVOption fields to their default values.
Definition: opt.c:1259
AVFormatInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1746
enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext *ctx)
Returns the method used to set ctx->duration.
Definition: options.c:150
int64_t offset
Offset to remap timestamps to be non-negative.
Definition: internal.h:108
Format I/O context.
Definition: avformat.h:1319
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
#define av_malloc(s)
AVOptions.
static void io_close_default(AVFormatContext *s, AVIOContext *pb)
Definition: options.c:115
AVDurationEstimationMethod
The duration of a video can be estimated through various ways, and this enum can be used to know how ...
Definition: avformat.h:1303
static void avformat_get_context_defaults(AVFormatContext *s)
Definition: options.c:120
const AVClass * av_class
A class for private options.
Definition: avio.h:124
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:132
const AVClass * priv_class
AVClass for the private context.
Definition: avformat.h:685
static AVClassCategory get_category(void *ptr)
Definition: options.c:84
char * protocol_whitelist
',' separated list of allowed protocols.
Definition: avformat.h:1855
const AVClass ff_avio_class
Definition: aviobuf.c:69
const AVClass * avformat_get_class(void)
Get the AVClass for AVFormatContext.
Definition: options.c:155
int raw_packet_buffer_remaining_size
Definition: internal.h:101
struct AVOutputFormat * oformat
The output container format.
Definition: avformat.h:1338
int avio_close(AVIOContext *s)
Close the resource accessed by the AVIOContext s and free it.
Definition: aviobuf.c:1015
static const AVOption avformat_options[]
Definition: options_table.h:36
AVClassCategory category
Category used for visualization (like color) This is only set if the category is equal for all object...
Definition: log.h:130
static const AVClass * format_child_class_next(const AVClass *prev)
Definition: options.c:56
common internal API header
static const uint16_t fc[]
Definition: dcaenc.h:41
const char * name
Definition: avformat.h:522
static const AVOption options[]
Definition: options.c:37
AVOutputFormat * av_oformat_next(const AVOutputFormat *f)
If f is NULL, returns the first registered output format, if f is non-NULL, returns the next register...
Definition: format.c:53
const AVClass * priv_class
AVClass for the private context.
Definition: avformat.h:550
AVIOContext * pb
I/O context.
Definition: avformat.h:1361
Describe the class of an AVClass context structure.
Definition: log.h:67
static void * format_child_next(void *obj, void *prev)
Definition: options.c:44
const AVClass * av_class
A class for logging and AVOptions.
Definition: avformat.h:1324
#define RAW_PACKET_BUFFER_SIZE
Remaining size available for raw_packet_buffer, in bytes.
Definition: internal.h:100
void avformat_free_context(AVFormatContext *s)
Free an AVFormatContext and all its streams.
Definition: utils.c:3978
int ffio_open_whitelist(AVIOContext **s, const char *url, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options, const char *whitelist, const char *blacklist)
Definition: aviobuf.c:984
static int flags
Definition: cpu.c:47
Main libavformat public API header.
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:80
FF_DISABLE_DEPRECATION_WARNINGS static FF_ENABLE_DEPRECATION_WARNINGS const char * format_to_name(void *ptr)
Definition: options.c:36
struct AVInputFormat * iformat
The input container format.
Definition: avformat.h:1331
AVClassCategory
Definition: log.h:29
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:81
void * priv_data
Format private data.
Definition: avformat.h:1347
char * protocol_blacklist
',' separated list of disallowed protocols.
Definition: avformat.h:1890
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:660
static int io_open_default(AVFormatContext *s, AVIOContext **pb, const char *url, int flags, AVDictionary **options)
Definition: options.c:102
int(* io_open)(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags, AVDictionary **options)
Definition: avformat.h:1877
void(* io_close)(struct AVFormatContext *s, AVIOContext *pb)
A callback for closing the streams opened with AVFormatContext.io_open().
Definition: avformat.h:1883
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:252
AVInputFormat * av_iformat_next(const AVInputFormat *f)
If f is NULL, returns the first registered input format, if f is non-NULL, returns the next registere...
Definition: format.c:45
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:240