blob: e43149561a33fc7d643c96237189f692517550f0
| 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 | { "sample_rates", "A '|'-separated list of sample rates.", OFFSET(sample_rates_str), AV_OPT_TYPE_STRING, .flags = A|F }, |
| 54 | { "channel_layouts", "A '|'-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, unref_fn, get_fmt, none, desc) \ |
| 61 | do { \ |
| 62 | char *next, *cur = str, sep; \ |
| 63 | int ret; \ |
| 64 | \ |
| 65 | if (str && strchr(str, ',')) { \ |
| 66 | av_log(ctx, AV_LOG_WARNING, "This syntax is deprecated, use '|' to "\ |
| 67 | "separate %s.\n", desc); \ |
| 68 | sep = ','; \ |
| 69 | } else \ |
| 70 | sep = '|'; \ |
| 71 | \ |
| 72 | while (cur) { \ |
| 73 | type fmt; \ |
| 74 | next = strchr(cur, sep); \ |
| 75 | if (next) \ |
| 76 | *next++ = 0; \ |
| 77 | \ |
| 78 | if ((fmt = get_fmt(cur)) == none) { \ |
| 79 | av_log(ctx, AV_LOG_ERROR, "Error parsing " desc ": %s.\n", cur);\ |
| 80 | return AVERROR(EINVAL); \ |
| 81 | } \ |
| 82 | if ((ret = add_to_list(&list, fmt)) < 0) { \ |
| 83 | unref_fn(&list); \ |
| 84 | return ret; \ |
| 85 | } \ |
| 86 | \ |
| 87 | cur = next; \ |
| 88 | } \ |
| 89 | } while (0) |
| 90 | |
| 91 | static int get_sample_rate(const char *samplerate) |
| 92 | { |
| 93 | int ret = strtol(samplerate, NULL, 0); |
| 94 | return FFMAX(ret, 0); |
| 95 | } |
| 96 | |
| 97 | static av_cold int init(AVFilterContext *ctx) |
| 98 | { |
| 99 | AFormatContext *s = ctx->priv; |
| 100 | |
| 101 | PARSE_FORMATS(s->formats_str, enum AVSampleFormat, s->formats, |
| 102 | ff_add_format, ff_formats_unref, av_get_sample_fmt, AV_SAMPLE_FMT_NONE, "sample format"); |
| 103 | PARSE_FORMATS(s->sample_rates_str, int, s->sample_rates, ff_add_format, ff_formats_unref, |
| 104 | get_sample_rate, 0, "sample rate"); |
| 105 | PARSE_FORMATS(s->channel_layouts_str, uint64_t, s->channel_layouts, |
| 106 | ff_add_channel_layout, ff_channel_layouts_unref, av_get_channel_layout, 0, |
| 107 | "channel layout"); |
| 108 | |
| 109 | return 0; |
| 110 | } |
| 111 | |
| 112 | static int query_formats(AVFilterContext *ctx) |
| 113 | { |
| 114 | AFormatContext *s = ctx->priv; |
| 115 | int ret; |
| 116 | |
| 117 | ret = ff_set_common_formats(ctx, s->formats ? s->formats : |
| 118 | ff_all_formats(AVMEDIA_TYPE_AUDIO)); |
| 119 | if (ret < 0) |
| 120 | return ret; |
| 121 | ret = ff_set_common_samplerates(ctx, s->sample_rates ? s->sample_rates : |
| 122 | ff_all_samplerates()); |
| 123 | if (ret < 0) |
| 124 | return ret; |
| 125 | return ff_set_common_channel_layouts(ctx, s->channel_layouts ? s->channel_layouts : |
| 126 | ff_all_channel_counts()); |
| 127 | } |
| 128 | |
| 129 | static const AVFilterPad avfilter_af_aformat_inputs[] = { |
| 130 | { |
| 131 | .name = "default", |
| 132 | .type = AVMEDIA_TYPE_AUDIO, |
| 133 | }, |
| 134 | { NULL } |
| 135 | }; |
| 136 | |
| 137 | static const AVFilterPad avfilter_af_aformat_outputs[] = { |
| 138 | { |
| 139 | .name = "default", |
| 140 | .type = AVMEDIA_TYPE_AUDIO |
| 141 | }, |
| 142 | { NULL } |
| 143 | }; |
| 144 | |
| 145 | AVFilter ff_af_aformat = { |
| 146 | .name = "aformat", |
| 147 | .description = NULL_IF_CONFIG_SMALL("Convert the input audio to one of the specified formats."), |
| 148 | .init = init, |
| 149 | .query_formats = query_formats, |
| 150 | .priv_size = sizeof(AFormatContext), |
| 151 | .priv_class = &aformat_class, |
| 152 | .inputs = avfilter_af_aformat_inputs, |
| 153 | .outputs = avfilter_af_aformat_outputs, |
| 154 | }; |
| 155 |