From 90ddcaaf2de7bbb503c3f5248339442109f54161 Mon Sep 17 00:00:00 2001 From: Vitaly Ostrosablin Date: Sat, 6 Aug 2016 10:50:35 +0300 Subject: avfilter: add crystalizer audio filter Signed-off-by: Vitaly Ostrosablin --- libavfilter/af_crystalizer.c | 153 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 153 insertions(+) create mode 100644 libavfilter/af_crystalizer.c (limited to 'libavfilter/af_crystalizer.c') diff --git a/libavfilter/af_crystalizer.c b/libavfilter/af_crystalizer.c new file mode 100644 index 0000000000..086549a93d --- /dev/null +++ b/libavfilter/af_crystalizer.c @@ -0,0 +1,153 @@ +/* + * Copyright (c) 2016 The FFmpeg Project + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "libavutil/channel_layout.h" +#include "libavutil/opt.h" +#include "avfilter.h" +#include "audio.h" +#include "formats.h" + +typedef struct CrystalizerContext { + const AVClass *class; + float mult; + int clip; + AVFrame *prev; +} CrystalizerContext; + +#define OFFSET(x) offsetof(CrystalizerContext, x) +#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM + +static const AVOption crystalizer_options[] = { + { "i", "set intensity", OFFSET(mult), AV_OPT_TYPE_FLOAT, {.dbl=2.0}, 0, 10, A }, + { "c", "enable clipping", OFFSET(clip), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, A }, + { NULL } +}; + +AVFILTER_DEFINE_CLASS(crystalizer); + +static int query_formats(AVFilterContext *ctx) +{ + AVFilterFormats *formats = NULL; + AVFilterChannelLayouts *layouts = NULL; + int ret; + + if ((ret = ff_add_format (&formats, AV_SAMPLE_FMT_FLT )) < 0 || + (ret = ff_set_common_formats(ctx , formats )) < 0) + return ret; + + layouts = ff_all_channel_counts(); + if (!layouts) + return AVERROR(ENOMEM); + + ret = ff_set_common_channel_layouts(ctx, layouts); + if (ret < 0) + return ret; + + formats = ff_all_samplerates(); + return ff_set_common_samplerates(ctx, formats); +} + +static int filter_frame(AVFilterLink *inlink, AVFrame *in) +{ + AVFilterContext *ctx = inlink->dst; + AVFilterLink *outlink = ctx->outputs[0]; + CrystalizerContext *s = ctx->priv; + const float *src = (const float *)in->data[0]; + const float mult = s->mult; + AVFrame *out; + float *dst, *prv; + int n, c; + + if (!s->prev) { + s->prev = ff_get_audio_buffer(inlink, 1); + if (!s->prev) { + av_frame_free(&in); + return AVERROR(ENOMEM); + } + } + + if (av_frame_is_writable(in)) { + out = in; + } else { + out = ff_get_audio_buffer(inlink, in->nb_samples); + if (!out) { + av_frame_free(&in); + return AVERROR(ENOMEM); + } + av_frame_copy_props(out, in); + } + + dst = (float *)out->data[0]; + prv = (float *)s->prev->data[0]; + + for (n = 0; n < in->nb_samples; n++) { + for (c = 0; c < in->channels; c++) { + float current = src[c]; + + dst[c] = current + (current - prv[c]) * mult; + prv[c] = current; + if (s->clip) { + dst[c] = av_clipf(dst[c], -1, 1); + } + } + dst += c; + src += c; + } + + if (out != in) + av_frame_free(&in); + + return ff_filter_frame(outlink, out); +} + +static av_cold void uninit(AVFilterContext *ctx) +{ + CrystalizerContext *s = ctx->priv; + + av_frame_free(&s->prev); +} + +static const AVFilterPad inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_AUDIO, + .filter_frame = filter_frame, + }, + { NULL } +}; + +static const AVFilterPad outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_AUDIO, + }, + { NULL } +}; + +AVFilter ff_af_crystalizer = { + .name = "crystalizer", + .description = NULL_IF_CONFIG_SMALL("Simple expand audio dynamic range filter."), + .query_formats = query_formats, + .priv_size = sizeof(CrystalizerContext), + .priv_class = &crystalizer_class, + .uninit = uninit, + .inputs = inputs, + .outputs = outputs, +}; -- cgit v1.2.3