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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 '|'-separated list of sample formats.", OFFSET(formats_str), AV_OPT_TYPE_STRING, .flags = A|F }, | ||
53 | { "f", "A '|'-separated list of sample formats.", OFFSET(formats_str), AV_OPT_TYPE_STRING, .flags = A|F }, | ||
54 | { "sample_rates", "A '|'-separated list of sample rates.", OFFSET(sample_rates_str), AV_OPT_TYPE_STRING, .flags = A|F }, | ||
55 | { "r", "A '|'-separated list of sample rates.", OFFSET(sample_rates_str), AV_OPT_TYPE_STRING, .flags = A|F }, | ||
56 | { "channel_layouts", "A '|'-separated list of channel layouts.", OFFSET(channel_layouts_str), AV_OPT_TYPE_STRING, .flags = A|F }, | ||
57 | { "cl", "A '|'-separated list of channel layouts.", OFFSET(channel_layouts_str), AV_OPT_TYPE_STRING, .flags = A|F }, | ||
58 | { NULL } | ||
59 | }; | ||
60 | |||
61 | AVFILTER_DEFINE_CLASS(aformat); | ||
62 | |||
63 | #define PARSE_FORMATS(str, type, list, add_to_list, get_fmt, none, desc) \ | ||
64 | do { \ | ||
65 | char *next, *cur = str; \ | ||
66 | int ret; \ | ||
67 | \ | ||
68 | while (cur) { \ | ||
69 | type fmt; \ | ||
70 | next = strchr(cur, '|'); \ | ||
71 | if (next) \ | ||
72 | *next++ = 0; \ | ||
73 | \ | ||
74 | if ((fmt = get_fmt(cur)) == none) { \ | ||
75 | av_log(ctx, AV_LOG_ERROR, "Error parsing " desc ": %s.\n", cur);\ | ||
76 | return AVERROR(EINVAL); \ | ||
77 | } \ | ||
78 | if ((ret = add_to_list(&list, fmt)) < 0) { \ | ||
79 | return ret; \ | ||
80 | } \ | ||
81 | \ | ||
82 | cur = next; \ | ||
83 | } \ | ||
84 | } while (0) | ||
85 | |||
86 | 336 | static int get_sample_rate(const char *samplerate) | |
87 | { | ||
88 | 336 | int ret = strtol(samplerate, NULL, 0); | |
89 | 336 | return FFMAX(ret, 0); | |
90 | } | ||
91 | |||
92 | 1875 | static int parse_channel_layouts(AVFilterContext *ctx) | |
93 | { | ||
94 | 1875 | AFormatContext *s = ctx->priv; | |
95 | 1875 | char *next, *cur = s->channel_layouts_str; | |
96 | 1875 | AVChannelLayout fmt = { 0 }; | |
97 | int ret; | ||
98 | |||
99 |
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2257 | while (cur) { |
100 | 382 | next = strchr(cur, '|'); | |
101 |
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382 | if (next) |
102 | 292 | *next++ = 0; | |
103 | |||
104 | 382 | ret = av_channel_layout_from_string(&fmt, cur); | |
105 |
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382 | if (ret < 0) { |
106 | ✗ | av_log(ctx, AV_LOG_ERROR, "Error parsing channel layout: %s.\n", cur); | |
107 | ✗ | return AVERROR(EINVAL); | |
108 | } | ||
109 | 382 | ret = ff_add_channel_layout(&s->channel_layouts, &fmt); | |
110 | 382 | av_channel_layout_uninit(&fmt); | |
111 |
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382 | if (ret < 0) |
112 | ✗ | return ret; | |
113 | |||
114 | 382 | cur = next; | |
115 | } | ||
116 | |||
117 | 1875 | return 0; | |
118 | } | ||
119 | |||
120 | 1875 | static av_cold int init(AVFilterContext *ctx) | |
121 | { | ||
122 | 1875 | AFormatContext *s = ctx->priv; | |
123 | int ret; | ||
124 | |||
125 |
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3835 | PARSE_FORMATS(s->formats_str, enum AVSampleFormat, s->formats, |
126 | ff_add_format, av_get_sample_fmt, AV_SAMPLE_FMT_NONE, "sample format"); | ||
127 |
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2211 | PARSE_FORMATS(s->sample_rates_str, int, s->sample_rates, ff_add_format, |
128 | get_sample_rate, 0, "sample rate"); | ||
129 | 1875 | ret = parse_channel_layouts(ctx); | |
130 |
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1875 | if (ret < 0) |
131 | ✗ | return ret; | |
132 | |||
133 | 1875 | return 0; | |
134 | } | ||
135 | |||
136 | 1875 | static av_cold void uninit(AVFilterContext *ctx) | |
137 | { | ||
138 | 1875 | AFormatContext *s = ctx->priv; | |
139 | |||
140 | 1875 | ff_formats_unref(&s->formats); | |
141 | 1875 | ff_formats_unref(&s->sample_rates); | |
142 | 1875 | ff_channel_layouts_unref(&s->channel_layouts); | |
143 | 1875 | } | |
144 | |||
145 | 1559 | static int query_formats(AVFilterContext *ctx) | |
146 | { | ||
147 | 1559 | AFormatContext *s = ctx->priv; | |
148 | int ret; | ||
149 | |||
150 |
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1559 | ret = ff_set_common_formats(ctx, s->formats ? s->formats : |
151 | ✗ | ff_all_formats(AVMEDIA_TYPE_AUDIO)); | |
152 | 1559 | s->formats = NULL; | |
153 |
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1559 | if (ret < 0) |
154 | ✗ | return ret; | |
155 |
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3050 | ret = ff_set_common_samplerates(ctx, s->sample_rates ? s->sample_rates : |
156 | 1491 | ff_all_samplerates()); | |
157 | 1559 | s->sample_rates = NULL; | |
158 |
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1559 | if (ret < 0) |
159 | ✗ | return ret; | |
160 |
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3028 | ret = ff_set_common_channel_layouts(ctx, s->channel_layouts ? s->channel_layouts : |
161 | 1469 | ff_all_channel_counts()); | |
162 | 1559 | s->channel_layouts = NULL; | |
163 | 1559 | return ret; | |
164 | } | ||
165 | |||
166 | const AVFilter ff_af_aformat = { | ||
167 | .name = "aformat", | ||
168 | .description = NULL_IF_CONFIG_SMALL("Convert the input audio to one of the specified formats."), | ||
169 | .init = init, | ||
170 | .uninit = uninit, | ||
171 | .priv_size = sizeof(AFormatContext), | ||
172 | .priv_class = &aformat_class, | ||
173 | .flags = AVFILTER_FLAG_METADATA_ONLY, | ||
174 | FILTER_INPUTS(ff_audio_default_filterpad), | ||
175 | FILTER_OUTPUTS(ff_audio_default_filterpad), | ||
176 | FILTER_QUERY_FUNC(query_formats), | ||
177 | }; | ||
178 |