buffersrc: switch to an AVOptions-based system.
[libav.git] / libavfilter / af_aformat.c
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1/*
2 * Copyright (c) 2011 Mina Nagy Zaki
3 *
4 * This file is part of Libav.
5 *
6 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21/**
22 * @file
23 * format audio filter
24 */
25
fb604ae8 26#include "libavutil/avstring.h"
a903f8f0 27#include "libavutil/channel_layout.h"
1d9c2dc8 28#include "libavutil/common.h"
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29#include "libavutil/opt.h"
30
31#include "audio.h"
32#include "avfilter.h"
33#include "formats.h"
34#include "internal.h"
35
36typedef struct AFormatContext {
37 const AVClass *class;
38
39 AVFilterFormats *formats;
40 AVFilterFormats *sample_rates;
41 AVFilterChannelLayouts *channel_layouts;
42
43 char *formats_str;
44 char *sample_rates_str;
45 char *channel_layouts_str;
46} AFormatContext;
47
48#define OFFSET(x) offsetof(AFormatContext, x)
49#define A AV_OPT_FLAG_AUDIO_PARAM
50static const AVOption options[] = {
51 { "sample_fmts", "A comma-separated list of sample formats.", OFFSET(formats_str), AV_OPT_TYPE_STRING, .flags = A },
52 { "sample_rates", "A comma-separated list of sample rates.", OFFSET(sample_rates_str), AV_OPT_TYPE_STRING, .flags = A },
53 { "channel_layouts", "A comma-separated list of channel layouts.", OFFSET(channel_layouts_str), AV_OPT_TYPE_STRING, .flags = A },
54 { NULL },
55};
56
57static const AVClass aformat_class = {
58 .class_name = "aformat filter",
59 .item_name = av_default_item_name,
60 .option = options,
61 .version = LIBAVUTIL_VERSION_INT,
62};
63
64#define PARSE_FORMATS(str, type, list, add_to_list, get_fmt, none, desc) \
65do { \
66 char *next, *cur = str; \
67 while (cur) { \
68 type fmt; \
69 next = strchr(cur, ','); \
70 if (next) \
71 *next++ = 0; \
72 \
73 if ((fmt = get_fmt(cur)) == none) { \
74 av_log(ctx, AV_LOG_ERROR, "Error parsing " desc ": %s.\n", cur);\
75 ret = AVERROR(EINVAL); \
76 goto fail; \
77 } \
78 add_to_list(&list, fmt); \
79 \
80 cur = next; \
81 } \
82} while (0)
83
84static int get_sample_rate(const char *samplerate)
85{
86 int ret = strtol(samplerate, NULL, 0);
87 return FFMAX(ret, 0);
88}
89
a5e8c41c 90static av_cold int init(AVFilterContext *ctx, const char *args)
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91{
92 AFormatContext *s = ctx->priv;
93 int ret;
94
95 if (!args) {
96 av_log(ctx, AV_LOG_ERROR, "No parameters supplied.\n");
97 return AVERROR(EINVAL);
98 }
99
100 s->class = &aformat_class;
101 av_opt_set_defaults(s);
102
103 if ((ret = av_set_options_string(s, args, "=", ":")) < 0) {
104 av_log(ctx, AV_LOG_ERROR, "Error parsing options string '%s'.\n", args);
105 return ret;
106 }
107
108 PARSE_FORMATS(s->formats_str, enum AVSampleFormat, s->formats,
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109 ff_add_format, av_get_sample_fmt, AV_SAMPLE_FMT_NONE, "sample format");
110 PARSE_FORMATS(s->sample_rates_str, int, s->sample_rates, ff_add_format,
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111 get_sample_rate, 0, "sample rate");
112 PARSE_FORMATS(s->channel_layouts_str, uint64_t, s->channel_layouts,
113 ff_add_channel_layout, av_get_channel_layout, 0,
114 "channel layout");
115
116fail:
117 av_opt_free(s);
118 return ret;
119}
120
121static int query_formats(AVFilterContext *ctx)
122{
123 AFormatContext *s = ctx->priv;
124
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125 ff_set_common_formats(ctx, s->formats ? s->formats :
126 ff_all_formats(AVMEDIA_TYPE_AUDIO));
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127 ff_set_common_samplerates(ctx, s->sample_rates ? s->sample_rates :
128 ff_all_samplerates());
129 ff_set_common_channel_layouts(ctx, s->channel_layouts ? s->channel_layouts :
130 ff_all_channel_layouts());
131
132 return 0;
133}
134
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135static const AVFilterPad avfilter_af_aformat_inputs[] = {
136 {
137 .name = "default",
138 .type = AVMEDIA_TYPE_AUDIO,
139 },
140 { NULL }
141};
142
143static const AVFilterPad avfilter_af_aformat_outputs[] = {
144 {
145 .name = "default",
146 .type = AVMEDIA_TYPE_AUDIO
147 },
148 { NULL }
149};
150
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151AVFilter avfilter_af_aformat = {
152 .name = "aformat",
153 .description = NULL_IF_CONFIG_SMALL("Convert the input audio to one of the specified formats."),
154 .init = init,
155 .query_formats = query_formats,
156 .priv_size = sizeof(AFormatContext),
157
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158 .inputs = avfilter_af_aformat_inputs,
159 .outputs = avfilter_af_aformat_outputs,
fb604ae8 160};