FFmpeg: libavformat/options.c Source File

FFmpeg
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 
32 FF_DISABLE_DEPRECATION_WARNINGS
33 #include "options_table.h"
34 FF_ENABLE_DEPRECATION_WARNINGS
35 
36  static const char* format_to_name(void* ptr)
37 {
38  AVFormatContext* fc = (AVFormatContext*) ptr;
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 
91  static const AVClass av_format_context_class = {
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,
98  .category = AV_CLASS_CATEGORY_MUXER,
99  .get_category = get_category,
100 };
101 
102  static int io_open_default(AVFormatContext *s, AVIOContext **pb,
103  const char *url, int flags, AVDictionary **options)
104 {
105  int loglevel;
106 
107  if (!strcmp(url, s->url) ||
108  s->iformat && !strcmp(s->iformat->name, "image2") ||
109  s->oformat && !strcmp(s->oformat->name, "image2")
110  ) {
111  loglevel = AV_LOG_DEBUG;
112  } else
113  loglevel = AV_LOG_INFO;
114 
115  av_log(s, loglevel, "Opening \'%s\' for %s\n", url, flags & AVIO_FLAG_WRITE ? "writing" : "reading");
116 
117 #if FF_API_OLD_OPEN_CALLBACKS
118 FF_DISABLE_DEPRECATION_WARNINGS
119  if (s->open_cb)
120  return s->open_cb(s, pb, url, flags, &s->interrupt_callback, options);
121 FF_ENABLE_DEPRECATION_WARNINGS
122 #endif
123 
124  return ffio_open_whitelist(pb, url, flags, &s->interrupt_callback, options, s->protocol_whitelist, s->protocol_blacklist);
125 }
126 
127  static void io_close_default(AVFormatContext *s, AVIOContext *pb)
128 {
129  avio_close(pb);
130 }
131 
132  static void avformat_get_context_defaults(AVFormatContext *s)
133 {
134  memset(s, 0, sizeof(AVFormatContext));
135 
136  s->av_class = &av_format_context_class;
137 
138  s->io_open = io_open_default;
139  s->io_close = io_close_default;
140 
141  av_opt_set_defaults(s);
142 }
143 
144  AVFormatContext *avformat_alloc_context(void)
145 {
146  AVFormatContext *ic;
147  ic = av_malloc(sizeof(AVFormatContext));
148  if (!ic) return ic;
149  avformat_get_context_defaults(ic);
150 
151  ic->internal = av_mallocz(sizeof(*ic->internal));
152  if (!ic->internal) {
153  avformat_free_context(ic);
154  return NULL;
155  }
156  ic->internal->offset = AV_NOPTS_VALUE;
157  ic->internal->raw_packet_buffer_remaining_size = RAW_PACKET_BUFFER_SIZE;
158  ic->internal->shortest_end = AV_NOPTS_VALUE;
159 
160  return ic;
161 }
162 
163  enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext* ctx)
164 {
165  return ctx->duration_estimation_method;
166 }
167 
168  const AVClass *avformat_get_class(void)
169 {
170  return &av_format_context_class;
171 }
NULL
#define NULL
Definition: coverity.c:32
s
const char * s
Definition: avisynth_c.h:768
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
av_format_context_class
static const AVClass av_format_context_class
Definition: options.c:91
AVFormatContext::interrupt_callback
AVIOInterruptCB interrupt_callback
Custom interrupt callbacks for the I/O layer.
Definition: avformat.h:1618
AVFormatContext::duration_estimation_method
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:1727
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
av_opt_set_defaults
void av_opt_set_defaults(void *s)
Set the values of all AVOption fields to their default values.
Definition: opt.c:1292
AVFormatContext::internal
AVFormatInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1793
AVIO_FLAG_WRITE
#define AVIO_FLAG_WRITE
write-only
Definition: avio.h:655
av_fmt_ctx_get_duration_estimation_method
enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext *ctx)
Returns the method used to set ctx->duration.
Definition: options.c:163
AVFormatInternal::offset
int64_t offset
Offset to remap timestamps to be non-negative.
Definition: internal.h:108
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
AVFormatContext
Format I/O context.
Definition: avformat.h:1342
AVClass::class_name
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
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
opt.h
AVOptions.
io_close_default
static void io_close_default(AVFormatContext *s, AVIOContext *pb)
Definition: options.c:127
AVDurationEstimationMethod
AVDurationEstimationMethod
The duration of a video can be estimated through various ways, and this enum can be used to know how ...
Definition: avformat.h:1320
avformat_get_context_defaults
static void avformat_get_context_defaults(AVFormatContext *s)
Definition: options.c:132
AVIOContext::av_class
const AVClass * av_class
A class for private options.
Definition: avio.h:174
avformat_alloc_context
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:144
avio_internal.h
AVInputFormat::priv_class
const AVClass * priv_class
AVClass for the private context.
Definition: avformat.h:672
get_category
static AVClassCategory get_category(void *ptr)
Definition: options.c:84
AVFormatContext::protocol_whitelist
char * protocol_whitelist
',' separated list of allowed protocols.
Definition: avformat.h:1900
flags
static int flags
Definition: log.c:55
ff_avio_class
const AVClass ff_avio_class
Definition: aviobuf.c:69
avformat_get_class
const AVClass * avformat_get_class(void)
Get the AVClass for AVFormatContext.
Definition: options.c:168
AVFormatInternal::raw_packet_buffer_remaining_size
int raw_packet_buffer_remaining_size
Definition: internal.h:101
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVFormatContext::oformat
struct AVOutputFormat * oformat
The output container format.
Definition: avformat.h:1361
AVDictionary
Definition: dict.c:30
avio_close
int avio_close(AVIOContext *s)
Close the resource accessed by the AVIOContext s and free it.
Definition: aviobuf.c:1190
AVFormatContext::url
char * url
input or output URL.
Definition: avformat.h:1438
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
avformat_options
static const AVOption avformat_options[]
Definition: options_table.h:36
AVClass::category
AVClassCategory category
Category used for visualization (like color) This is only set if the category is equal for all object...
Definition: log.h:130
format_child_class_next
static const AVClass * format_child_class_next(const AVClass *prev)
Definition: options.c:56
internal.h
common internal API header
fc
static const uint16_t fc[]
Definition: dcaenc.h:43
AVFormatInternal::shortest_end
int64_t shortest_end
Timestamp of the end of the shortest stream.
Definition: internal.h:126
AVOutputFormat::name
const char * name
Definition: avformat.h:507
ctx
AVFormatContext * ctx
Definition: movenc.c:48
options
static const AVOption options[]
Definition: options.c:37
AVOutputFormat::priv_class
const AVClass * priv_class
AVClass for the private context.
Definition: avformat.h:535
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1384
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
format_child_next
static void * format_child_next(void *obj, void *prev)
Definition: options.c:44
AVFormatContext::av_class
const AVClass * av_class
A class for logging and AVOptions.
Definition: avformat.h:1347
RAW_PACKET_BUFFER_SIZE
#define RAW_PACKET_BUFFER_SIZE
Remaining size available for raw_packet_buffer, in bytes.
Definition: internal.h:100
avformat_free_context
void avformat_free_context(AVFormatContext *s)
Free an AVFormatContext and all its streams.
Definition: utils.c:4384
ffio_open_whitelist
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:1159
avformat.h
Main libavformat public API header.
FF_DISABLE_DEPRECATION_WARNINGS
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:84
format_to_name
FF_DISABLE_DEPRECATION_WARNINGS static FF_ENABLE_DEPRECATION_WARNINGS const char * format_to_name(void *ptr)
Definition: options.c:36
AVFormatContext::iformat
struct AVInputFormat * iformat
The input container format.
Definition: avformat.h:1354
options_table.h
AVClassCategory
AVClassCategory
Definition: log.h:29
FF_ENABLE_DEPRECATION_WARNINGS
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:85
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1370
AVFormatContext::protocol_blacklist
char * protocol_blacklist
',' separated list of disallowed protocols.
Definition: avformat.h:1935
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:647
io_open_default
static int io_open_default(AVFormatContext *s, AVIOContext **pb, const char *url, int flags, AVDictionary **options)
Definition: options.c:102
AVFormatContext::io_open
int(* io_open)(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags, AVDictionary **options)
A callback for opening new IO streams.
Definition: avformat.h:1922
AVFormatContext::io_close
void(* io_close)(struct AVFormatContext *s, AVIOContext *pb)
A callback for closing the streams opened with AVFormatContext.io_open().
Definition: avformat.h:1928
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
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