2 * Copyright (c) 2016 The FFmpeg Project
4 * This file is part of FFmpeg.
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.
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.
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
21 #include "libavutil/channel_layout.h"
22 #include "libavutil/opt.h"
27 typedef struct CrystalizerContext {
32 void (*filter)(void **dst, void **prv, const void **src,
33 int nb_samples, int channels, float mult, int clip);
36 #define OFFSET(x) offsetof(CrystalizerContext, x)
37 #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
39 static const AVOption crystalizer_options[] = {
40 { "i", "set intensity", OFFSET(mult), AV_OPT_TYPE_FLOAT, {.dbl=2.0}, 0, 10, A },
41 { "c", "enable clipping", OFFSET(clip), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, A },
45 AVFILTER_DEFINE_CLASS(crystalizer);
47 static int query_formats(AVFilterContext *ctx)
49 AVFilterFormats *formats = NULL;
50 AVFilterChannelLayouts *layouts = NULL;
51 static const enum AVSampleFormat sample_fmts[] = {
52 AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLTP,
53 AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBLP,
58 formats = ff_make_format_list(sample_fmts);
60 return AVERROR(ENOMEM);
61 ret = ff_set_common_formats(ctx, formats);
65 layouts = ff_all_channel_counts();
67 return AVERROR(ENOMEM);
69 ret = ff_set_common_channel_layouts(ctx, layouts);
73 formats = ff_all_samplerates();
74 return ff_set_common_samplerates(ctx, formats);
77 static void filter_flt(void **d, void **p, const void **s,
78 int nb_samples, int channels,
81 const float *src = s[0];
86 for (n = 0; n < nb_samples; n++) {
87 for (c = 0; c < channels; c++) {
88 float current = src[c];
90 dst[c] = current + (current - prv[c]) * mult;
93 dst[c] = av_clipf(dst[c], -1, 1);
102 static void filter_dbl(void **d, void **p, const void **s,
103 int nb_samples, int channels,
104 float mult, int clip)
106 const double *src = s[0];
111 for (n = 0; n < nb_samples; n++) {
112 for (c = 0; c < channels; c++) {
113 double current = src[c];
115 dst[c] = current + (current - prv[c]) * mult;
118 dst[c] = av_clipd(dst[c], -1, 1);
127 static void filter_fltp(void **d, void **p, const void **s,
128 int nb_samples, int channels,
129 float mult, int clip)
133 for (c = 0; c < channels; c++) {
134 const float *src = s[c];
138 for (n = 0; n < nb_samples; n++) {
139 float current = src[n];
141 dst[n] = current + (current - prv[0]) * mult;
144 dst[n] = av_clipf(dst[n], -1, 1);
150 static void filter_dblp(void **d, void **p, const void **s,
151 int nb_samples, int channels,
152 float mult, int clip)
156 for (c = 0; c < channels; c++) {
157 const double *src = s[c];
161 for (n = 0; n < nb_samples; n++) {
162 double current = src[n];
164 dst[n] = current + (current - prv[0]) * mult;
167 dst[n] = av_clipd(dst[n], -1, 1);
173 static int config_input(AVFilterLink *inlink)
175 AVFilterContext *ctx = inlink->dst;
176 CrystalizerContext *s = ctx->priv;
178 switch (inlink->format) {
179 case AV_SAMPLE_FMT_FLT: s->filter = filter_flt; break;
180 case AV_SAMPLE_FMT_DBL: s->filter = filter_dbl; break;
181 case AV_SAMPLE_FMT_FLTP: s->filter = filter_fltp; break;
182 case AV_SAMPLE_FMT_DBLP: s->filter = filter_dblp; break;
188 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
190 AVFilterContext *ctx = inlink->dst;
191 AVFilterLink *outlink = ctx->outputs[0];
192 CrystalizerContext *s = ctx->priv;
196 s->prev = ff_get_audio_buffer(inlink, 1);
199 return AVERROR(ENOMEM);
203 if (av_frame_is_writable(in)) {
206 out = ff_get_audio_buffer(outlink, in->nb_samples);
209 return AVERROR(ENOMEM);
211 av_frame_copy_props(out, in);
214 s->filter((void **)out->extended_data, (void **)s->prev->extended_data, (const void **)in->extended_data,
215 in->nb_samples, in->channels, s->mult, s->clip);
220 return ff_filter_frame(outlink, out);
223 static av_cold void uninit(AVFilterContext *ctx)
225 CrystalizerContext *s = ctx->priv;
227 av_frame_free(&s->prev);
230 static const AVFilterPad inputs[] = {
233 .type = AVMEDIA_TYPE_AUDIO,
234 .filter_frame = filter_frame,
235 .config_props = config_input,
240 static const AVFilterPad outputs[] = {
243 .type = AVMEDIA_TYPE_AUDIO,
248 AVFilter ff_af_crystalizer = {
249 .name = "crystalizer",
250 .description = NULL_IF_CONFIG_SMALL("Simple expand audio dynamic range filter."),
251 .query_formats = query_formats,
252 .priv_size = sizeof(CrystalizerContext),
253 .priv_class = &crystalizer_class,