FFmpeg: libavfilter/af_aformat.c Source File

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libavfilter

af_aformat.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 */

21 /**

22 * @file

23 * format audio filter

24 */

26 #include "libavutil/avstring.h"

27 #include "libavutil/channel_layout.h"

28 #include "libavutil/common.h"

29 #include "libavutil/opt.h"

31 #include "audio.h"

32 #include "avfilter.h"

33 #include "formats.h"

34 #include "internal.h"

36 typedef struct AFormatContext {

37 const AVClass *class;

39 AVFilterFormats *formats;

40 AVFilterFormats *sample_rates;

41 AVFilterChannelLayouts *channel_layouts;

43 char *formats_str;

44 char *sample_rates_str;

45 char *channel_layouts_str;

46 } AFormatContext;

48 #define OFFSET(x) offsetof(AFormatContext, x)

49 #define A AV_OPT_FLAG_AUDIO_PARAM

50 #define F AV_OPT_FLAG_FILTERING_PARAM

51 static const AVOption aformat_options[] = {

52 { "sample_fmts", "A comma-separated list of sample formats.", OFFSET(formats_str), AV_OPT_TYPE_STRING, .flags = A|F },

53 { "sample_rates", "A comma-separated list of sample rates.", OFFSET(sample_rates_str), AV_OPT_TYPE_STRING, .flags = A|F },

54 { "channel_layouts", "A comma-separated list of channel layouts.", OFFSET(channel_layouts_str), AV_OPT_TYPE_STRING, .flags = A|F },

55 { NULL }

56 };

58 AVFILTER_DEFINE_CLASS(aformat);

60 #define PARSE_FORMATS(str, type, list, add_to_list, get_fmt, none, desc) \

61 do { \

62 char *next, *cur = str, sep; \

63 \

64 if (str && strchr(str, ',')) { \

65 av_log(ctx, AV_LOG_WARNING, "This syntax is deprecated, use '|' to "\

66 "separate %s.\n", desc); \

67 sep = ','; \

68 } else \

69 sep = '|'; \

70 \

71 while (cur) { \

72 type fmt; \

73 next = strchr(cur, sep); \

74 if (next) \

75 *next++ = 0; \

76 \

77 if ((fmt = get_fmt(cur)) == none) { \

78 av_log(ctx, AV_LOG_ERROR, "Error parsing " desc ": %s.\n", cur);\

79 return AVERROR(EINVAL); \

80 } \

81 add_to_list(&list, fmt); \

82 \

83 cur = next; \

84 } \

85 } while (0)

87 static int get_sample_rate(const char *samplerate)

88 {

89 int ret = strtol(samplerate, NULL, 0);

90 return FFMAX(ret, 0);

91 }

93 static av_cold int init(AVFilterContext *ctx)

94 {

95 AFormatContext *s = ctx->priv;

97 PARSE_FORMATS(s->formats_str, enum AVSampleFormat, s->formats,

98 ff_add_format, av_get_sample_fmt, AV_SAMPLE_FMT_NONE, "sample format");

99 PARSE_FORMATS(s->sample_rates_str, int, s->sample_rates, ff_add_format,

100 get_sample_rate, 0, "sample rate");

101 PARSE_FORMATS(s->channel_layouts_str, uint64_t, s->channel_layouts,

102 ff_add_channel_layout, av_get_channel_layout, 0,

103 "channel layout");

104

105 return 0;

106 }

107

108 static int query_formats(AVFilterContext *ctx)

109 {

110 AFormatContext *s = ctx->priv;

111

112 ff_set_common_formats(ctx, s->formats ? s->formats :

113 ff_all_formats(AVMEDIA_TYPE_AUDIO));

114 ff_set_common_samplerates(ctx, s->sample_rates ? s->sample_rates :

115 ff_all_samplerates());

116 ff_set_common_channel_layouts(ctx, s->channel_layouts ? s->channel_layouts :

117 ff_all_channel_counts());

118

119 return 0;

120 }

121

122 static const AVFilterPad avfilter_af_aformat_inputs[] = {

123 {

124 .name = "default",

125 .type = AVMEDIA_TYPE_AUDIO,

126 },

127 { NULL }

128 };

129

130 static const AVFilterPad avfilter_af_aformat_outputs[] = {

131 {

132 .name = "default",

133 .type = AVMEDIA_TYPE_AUDIO

134 },

135 { NULL }

136 };

137

138 AVFilter ff_af_aformat = {

139 .name = "aformat",

140 .description = NULL_IF_CONFIG_SMALL("Convert the input audio to one of the specified formats."),

141 .init = init,

142 .query_formats = query_formats,

143 .priv_size = sizeof(AFormatContext),

144 .priv_class = &aformat_class,

145 .inputs = avfilter_af_aformat_inputs,

146 .outputs = avfilter_af_aformat_outputs,

147 };

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