blob: 086549a93d13f83a1c52b36456f1fb883dee5bce
| 1 | /* |
| 2 | * Copyright (c) 2016 The FFmpeg Project |
| 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 | #include "libavutil/channel_layout.h" |
| 22 | #include "libavutil/opt.h" |
| 23 | #include "avfilter.h" |
| 24 | #include "audio.h" |
| 25 | #include "formats.h" |
| 26 | |
| 27 | typedef struct CrystalizerContext { |
| 28 | const AVClass *class; |
| 29 | float mult; |
| 30 | int clip; |
| 31 | AVFrame *prev; |
| 32 | } CrystalizerContext; |
| 33 | |
| 34 | #define OFFSET(x) offsetof(CrystalizerContext, x) |
| 35 | #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
| 36 | |
| 37 | static const AVOption crystalizer_options[] = { |
| 38 | { "i", "set intensity", OFFSET(mult), AV_OPT_TYPE_FLOAT, {.dbl=2.0}, 0, 10, A }, |
| 39 | { "c", "enable clipping", OFFSET(clip), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, A }, |
| 40 | { NULL } |
| 41 | }; |
| 42 | |
| 43 | AVFILTER_DEFINE_CLASS(crystalizer); |
| 44 | |
| 45 | static int query_formats(AVFilterContext *ctx) |
| 46 | { |
| 47 | AVFilterFormats *formats = NULL; |
| 48 | AVFilterChannelLayouts *layouts = NULL; |
| 49 | int ret; |
| 50 | |
| 51 | if ((ret = ff_add_format (&formats, AV_SAMPLE_FMT_FLT )) < 0 || |
| 52 | (ret = ff_set_common_formats(ctx , formats )) < 0) |
| 53 | return ret; |
| 54 | |
| 55 | layouts = ff_all_channel_counts(); |
| 56 | if (!layouts) |
| 57 | return AVERROR(ENOMEM); |
| 58 | |
| 59 | ret = ff_set_common_channel_layouts(ctx, layouts); |
| 60 | if (ret < 0) |
| 61 | return ret; |
| 62 | |
| 63 | formats = ff_all_samplerates(); |
| 64 | return ff_set_common_samplerates(ctx, formats); |
| 65 | } |
| 66 | |
| 67 | static int filter_frame(AVFilterLink *inlink, AVFrame *in) |
| 68 | { |
| 69 | AVFilterContext *ctx = inlink->dst; |
| 70 | AVFilterLink *outlink = ctx->outputs[0]; |
| 71 | CrystalizerContext *s = ctx->priv; |
| 72 | const float *src = (const float *)in->data[0]; |
| 73 | const float mult = s->mult; |
| 74 | AVFrame *out; |
| 75 | float *dst, *prv; |
| 76 | int n, c; |
| 77 | |
| 78 | if (!s->prev) { |
| 79 | s->prev = ff_get_audio_buffer(inlink, 1); |
| 80 | if (!s->prev) { |
| 81 | av_frame_free(&in); |
| 82 | return AVERROR(ENOMEM); |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | if (av_frame_is_writable(in)) { |
| 87 | out = in; |
| 88 | } else { |
| 89 | out = ff_get_audio_buffer(inlink, in->nb_samples); |
| 90 | if (!out) { |
| 91 | av_frame_free(&in); |
| 92 | return AVERROR(ENOMEM); |
| 93 | } |
| 94 | av_frame_copy_props(out, in); |
| 95 | } |
| 96 | |
| 97 | dst = (float *)out->data[0]; |
| 98 | prv = (float *)s->prev->data[0]; |
| 99 | |
| 100 | for (n = 0; n < in->nb_samples; n++) { |
| 101 | for (c = 0; c < in->channels; c++) { |
| 102 | float current = src[c]; |
| 103 | |
| 104 | dst[c] = current + (current - prv[c]) * mult; |
| 105 | prv[c] = current; |
| 106 | if (s->clip) { |
| 107 | dst[c] = av_clipf(dst[c], -1, 1); |
| 108 | } |
| 109 | } |
| 110 | dst += c; |
| 111 | src += c; |
| 112 | } |
| 113 | |
| 114 | if (out != in) |
| 115 | av_frame_free(&in); |
| 116 | |
| 117 | return ff_filter_frame(outlink, out); |
| 118 | } |
| 119 | |
| 120 | static av_cold void uninit(AVFilterContext *ctx) |
| 121 | { |
| 122 | CrystalizerContext *s = ctx->priv; |
| 123 | |
| 124 | av_frame_free(&s->prev); |
| 125 | } |
| 126 | |
| 127 | static const AVFilterPad inputs[] = { |
| 128 | { |
| 129 | .name = "default", |
| 130 | .type = AVMEDIA_TYPE_AUDIO, |
| 131 | .filter_frame = filter_frame, |
| 132 | }, |
| 133 | { NULL } |
| 134 | }; |
| 135 | |
| 136 | static const AVFilterPad outputs[] = { |
| 137 | { |
| 138 | .name = "default", |
| 139 | .type = AVMEDIA_TYPE_AUDIO, |
| 140 | }, |
| 141 | { NULL } |
| 142 | }; |
| 143 | |
| 144 | AVFilter ff_af_crystalizer = { |
| 145 | .name = "crystalizer", |
| 146 | .description = NULL_IF_CONFIG_SMALL("Simple expand audio dynamic range filter."), |
| 147 | .query_formats = query_formats, |
| 148 | .priv_size = sizeof(CrystalizerContext), |
| 149 | .priv_class = &crystalizer_class, |
| 150 | .uninit = uninit, |
| 151 | .inputs = inputs, |
| 152 | .outputs = outputs, |
| 153 | }; |
| 154 |