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1 | /* |
2 | * Copyright (c) 2011 Mina Nagy Zaki | |
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 | ||
21 | /** | |
22 | * @file | |
23 | * format audio filter | |
24 | */ | |
25 | ||
26 | #include "libavutil/avstring.h" | |
27 | #include "libavutil/channel_layout.h" | |
28 | #include "libavutil/common.h" | |
29 | #include "libavutil/opt.h" | |
30 | ||
31 | #include "audio.h" | |
32 | #include "avfilter.h" | |
33 | #include "formats.h" | |
34 | #include "internal.h" | |
35 | ||
36 | typedef 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 | |
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 | }; | |
57 | ||
58 | AVFILTER_DEFINE_CLASS(aformat); | |
59 | ||
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) | |
86 | ||
87 | static int get_sample_rate(const char *samplerate) | |
88 | { | |
89 | int ret = strtol(samplerate, NULL, 0); | |
90 | return FFMAX(ret, 0); | |
91 | } | |
92 | ||
93 | static av_cold int init(AVFilterContext *ctx) | |
94 | { | |
95 | AFormatContext *s = ctx->priv; | |
96 | ||
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 | }; |