FFmpeg: libavformat/options.c Source File

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libavformat

options.c

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1 /*

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 "libavutil/opt.h"

24 /**

25 * @file

26 * Options definition for AVFormatContext.

27 */

29 #include "options_table.h"

31 static const char* format_to_name(void* ptr)

32 {

33 AVFormatContext* fc = (AVFormatContext*) ptr;

34 if(fc->iformat) return fc->iformat->name;

35 else if(fc->oformat) return fc->oformat->name;

36 else return "NULL";

37 }

39 static void *format_child_next(void *obj, void *prev)

40 {

41 AVFormatContext *s = obj;

42 if (!prev && s->priv_data &&

43 ((s->iformat && s->iformat->priv_class) ||

44 s->oformat && s->oformat->priv_class))

45 return s->priv_data;

46 if (s->pb && s->pb->av_class && prev != s->pb)

47 return s->pb;

48 return NULL;

49 }

51 static const AVClass *format_child_class_next(const AVClass *prev)

52 {

53 AVInputFormat *ifmt = NULL;

54 AVOutputFormat *ofmt = NULL;

56 if (!prev)

57 return &ffio_url_class;

59 while ((ifmt = av_iformat_next(ifmt)))

60 if (ifmt->priv_class == prev)

61 break;

63 if (!ifmt)

64 while ((ofmt = av_oformat_next(ofmt)))

65 if (ofmt->priv_class == prev)

66 break;

67 if (!ofmt)

68 while (ifmt = av_iformat_next(ifmt))

69 if (ifmt->priv_class)

70 return ifmt->priv_class;

72 while (ofmt = av_oformat_next(ofmt))

73 if (ofmt->priv_class)

74 return ofmt->priv_class;

76 return NULL;

77 }

79 static AVClassCategory get_category(void *ptr)

80 {

81 AVFormatContext* s = ptr;

82 if(s->iformat) return AV_CLASS_CATEGORY_DEMUXER;

83 else return AV_CLASS_CATEGORY_MUXER;

84 }

86 static const AVClass av_format_context_class = {

87 .class_name = "AVFormatContext",

88 .item_name = format_to_name,

89 .option = options,

90 .version = LIBAVUTIL_VERSION_INT,

91 .child_next = format_child_next,

92 .child_class_next = format_child_class_next,

93 .category = AV_CLASS_CATEGORY_MUXER,

94 .get_category = get_category,

95 };

97 static void avformat_get_context_defaults(AVFormatContext *s)

98 {

99 memset(s, 0, sizeof(AVFormatContext));

100

101 s->av_class = &av_format_context_class;

102

103 av_opt_set_defaults(s);

104 }

105

106 AVFormatContext *avformat_alloc_context(void)

107 {

108 AVFormatContext *ic;

109 ic = av_malloc(sizeof(AVFormatContext));

110 if (!ic) return ic;

111 avformat_get_context_defaults(ic);

112 return ic;

113 }

114

115 enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext* ctx)

116 {

117 return ctx->duration_estimation_method;

118 }

119

120 const AVClass *avformat_get_class(void)

121 {

122 return &av_format_context_class;

123 }

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