mirror of https://git.videolan.org/git/ffmpeg.git
avfilter: add dialogue enhance audio filter
This commit is contained in:
Paul B Mahol
parent
800dfd2eac
commit
f05c52985c
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@ -1,7 +1,8 @@
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Entries are sorted chronologically from oldest to youngest within each release,
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releases are sorted from youngest to oldest.
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version <next>:
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version 5.1:
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- dialogue enhance audio filter
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version 5.0:
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@ -4182,6 +4182,34 @@ Default value is @var{o}.
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@end table
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@section dialoguenhance
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Enhance dialogue in stereo audio.
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This filter accepts stereo input and produce surround (3.0) channels output.
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The newly produced front center channel have enhanced speech dialogue originally
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available in both stereo channels.
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This filter outputs front left and front right channels same as available in stereo input.
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The filter accepts the following options:
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@table @option
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@item original
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Set the original center factor to keep in front center channel output.
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Allowed range is from 0 to 1. Default value is 1.
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@item enhance
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Set the dialogue enhance factor to put in front center channel output.
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Allowed range is from 0 to 3. Default value is 1.
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@item voice
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Set the voice detection factor.
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Allowed range is from 2 to 32. Default value is 2.
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@end table
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@subsection Commands
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This filter supports the all above options as @ref{commands}.
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@section drmeter
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Measure audio dynamic range.
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@ -124,6 +124,7 @@ OBJS-$(CONFIG_CROSSFEED_FILTER) += af_crossfeed.o
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OBJS-$(CONFIG_CRYSTALIZER_FILTER) += af_crystalizer.o
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OBJS-$(CONFIG_DCSHIFT_FILTER) += af_dcshift.o
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OBJS-$(CONFIG_DEESSER_FILTER) += af_deesser.o
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OBJS-$(CONFIG_DIALOGUENHANCE_FILTER) += af_dialoguenhance.o
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OBJS-$(CONFIG_DRMETER_FILTER) += af_drmeter.o
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OBJS-$(CONFIG_DYNAUDNORM_FILTER) += af_dynaudnorm.o
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OBJS-$(CONFIG_EARWAX_FILTER) += af_earwax.o
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@ -0,0 +1,407 @@
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/*
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* Copyright (c) 2022 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/channel_layout.h"
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#include "libavutil/opt.h"
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#include "libavutil/tx.h"
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#include "audio.h"
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#include "avfilter.h"
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#include "filters.h"
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#include "internal.h"
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#include "window_func.h"
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#include <float.h>
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typedef struct AudioDialogueEnhancementContext {
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const AVClass *class;
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double original, enhance, voice;
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int fft_size;
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int overlap;
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float *window;
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float prev_vad;
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AVFrame *in;
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AVFrame *in_frame;
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AVFrame *out_dist_frame;
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AVFrame *windowed_frame;
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AVFrame *windowed_out;
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AVFrame *windowed_prev;
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AVFrame *center_frame;
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AVTXContext *tx_ctx[2], *itx_ctx;
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av_tx_fn tx_fn, itx_fn;
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} AudioDialogueEnhanceContext;
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#define OFFSET(x) offsetof(AudioDialogueEnhanceContext, x)
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#define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_RUNTIME_PARAM
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static const AVOption dialoguenhance_options[] = {
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{ "original", "set original center factor", OFFSET(original), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },
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{ "enhance", "set dialogue enhance factor",OFFSET(enhance), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 3, FLAGS },
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{ "voice", "set voice detection factor", OFFSET(voice), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 2,32, FLAGS },
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{NULL}
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};
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AVFILTER_DEFINE_CLASS(dialoguenhance);
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static int query_formats(AVFilterContext *ctx)
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{
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AVFilterFormats *formats = NULL;
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AVFilterChannelLayouts *in_layout = NULL, *out_layout = NULL;
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int ret;
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if ((ret = ff_add_format (&formats, AV_SAMPLE_FMT_FLTP )) < 0 ||
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(ret = ff_set_common_formats (ctx , formats )) < 0 ||
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(ret = ff_add_channel_layout (&in_layout , AV_CH_LAYOUT_STEREO)) < 0 ||
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(ret = ff_channel_layouts_ref(in_layout, &ctx->inputs[0]->outcfg.channel_layouts)) < 0 ||
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(ret = ff_add_channel_layout (&out_layout , AV_CH_LAYOUT_SURROUND)) < 0 ||
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(ret = ff_channel_layouts_ref(out_layout, &ctx->outputs[0]->incfg.channel_layouts)) < 0)
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return ret;
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return ff_set_common_all_samplerates(ctx);
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}
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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AudioDialogueEnhanceContext *s = ctx->priv;
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float scale = 1.f, iscale, overlap;
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int ret;
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s->fft_size = inlink->sample_rate > 100000 ? 8192 : inlink->sample_rate > 50000 ? 4096 : 2048;
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s->overlap = s->fft_size / 4;
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s->window = av_calloc(s->fft_size, sizeof(*s->window));
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if (!s->window)
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return AVERROR(ENOMEM);
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s->in_frame = ff_get_audio_buffer(inlink, s->fft_size * 4);
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s->center_frame = ff_get_audio_buffer(inlink, s->fft_size * 4);
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s->out_dist_frame = ff_get_audio_buffer(inlink, s->fft_size * 4);
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s->windowed_frame = ff_get_audio_buffer(inlink, s->fft_size * 4);
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s->windowed_out = ff_get_audio_buffer(inlink, s->fft_size * 4);
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s->windowed_prev = ff_get_audio_buffer(inlink, s->fft_size * 4);
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if (!s->in_frame || !s->windowed_out || !s->windowed_prev ||
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!s->out_dist_frame || !s->windowed_frame || !s->center_frame)
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return AVERROR(ENOMEM);
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generate_window_func(s->window, s->fft_size, WFUNC_SINE, &overlap);
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iscale = 1.f / s->fft_size;
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ret = av_tx_init(&s->tx_ctx[0], &s->tx_fn, AV_TX_FLOAT_RDFT, 0, s->fft_size, &scale, 0);
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if (ret < 0)
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return ret;
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ret = av_tx_init(&s->tx_ctx[1], &s->tx_fn, AV_TX_FLOAT_RDFT, 0, s->fft_size, &scale, 0);
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if (ret < 0)
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return ret;
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ret = av_tx_init(&s->itx_ctx, &s->itx_fn, AV_TX_FLOAT_RDFT, 1, s->fft_size, &iscale, 0);
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if (ret < 0)
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return ret;
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return 0;
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}
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static void apply_window(AudioDialogueEnhanceContext *s,
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const float *in_frame, float *out_frame, const int add_to_out_frame)
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{
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const float *window = s->window;
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if (add_to_out_frame) {
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for (int i = 0; i < s->fft_size; i++)
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out_frame[i] += in_frame[i] * window[i];
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} else {
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for (int i = 0; i < s->fft_size; i++)
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out_frame[i] = in_frame[i] * window[i];
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}
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}
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static float sqrf(float x)
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{
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return x * x;
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}
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static void get_centere(AVComplexFloat *left, AVComplexFloat *right,
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AVComplexFloat *center, int N)
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{
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for (int i = 0; i < N; i++) {
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const float l_re = left[i].re;
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const float l_im = left[i].im;
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const float r_re = right[i].re;
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const float r_im = right[i].im;
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const float a = 0.5f * (1.f - sqrtf((sqrf(l_re - r_re) + sqrf(l_im - r_im))/
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(sqrf(l_re + r_re) + sqrf(l_im + r_im) + FLT_EPSILON)));
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center[i].re = a * (l_re + r_re);
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center[i].im = a * (l_im + r_im);
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}
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}
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static float flux(float *curf, float *prevf, int N)
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{
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AVComplexFloat *cur = (AVComplexFloat *)curf;
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AVComplexFloat *prev = (AVComplexFloat *)prevf;
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float sum = 0.f;
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for (int i = 0; i < N; i++) {
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float c_re = cur[i].re;
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float c_im = cur[i].im;
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float p_re = prev[i].re;
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float p_im = prev[i].im;
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sum += sqrf(hypotf(c_re, c_im) - hypotf(p_re, p_im));
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}
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return sum;
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}
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static float fluxlr(float *lf, float *lpf,
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float *rf, float *rpf,
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int N)
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{
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AVComplexFloat *l = (AVComplexFloat *)lf;
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AVComplexFloat *lp = (AVComplexFloat *)lpf;
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AVComplexFloat *r = (AVComplexFloat *)rf;
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AVComplexFloat *rp = (AVComplexFloat *)rpf;
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float sum = 0.f;
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for (int i = 0; i < N; i++) {
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float c_re = l[i].re - r[i].re;
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float c_im = l[i].im - r[i].im;
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float p_re = lp[i].re - rp[i].re;
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float p_im = lp[i].im - rp[i].im;
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sum += sqrf(hypotf(c_re, c_im) - hypotf(p_re, p_im));
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}
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return sum;
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}
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static float calc_vad(float fc, float flr, float a)
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{
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const float vad = a * (fc / (fc + flr) - 0.5f);
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return av_clipf(vad, 0.f, 1.f);
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}
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static void get_final(float *c, float *l,
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float *r, float vad, int N,
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float original, float enhance)
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{
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AVComplexFloat *center = (AVComplexFloat *)c;
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AVComplexFloat *left = (AVComplexFloat *)l;
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AVComplexFloat *right = (AVComplexFloat *)r;
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for (int i = 0; i < N; i++) {
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float cP = sqrf(center[i].re) + sqrf(center[i].im);
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float lrP = sqrf(left[i].re - right[i].re) + sqrf(left[i].im - right[i].im);
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float G = cP / (cP + lrP + FLT_EPSILON);
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float re, im;
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re = center[i].re * (original + vad * G * enhance);
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im = center[i].im * (original + vad * G * enhance);
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center[i].re = re;
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center[i].im = im;
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}
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}
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static int de_stereo(AVFilterContext *ctx, AVFrame *out)
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{
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AudioDialogueEnhanceContext *s = ctx->priv;
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float *center = (float *)s->center_frame->extended_data[0];
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float *center_prev = (float *)s->center_frame->extended_data[1];
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float *left_in = (float *)s->in_frame->extended_data[0];
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float *right_in = (float *)s->in_frame->extended_data[1];
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float *left_out = (float *)s->out_dist_frame->extended_data[0];
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float *right_out = (float *)s->out_dist_frame->extended_data[1];
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float *left_samples = (float *)s->in->extended_data[0];
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float *right_samples = (float *)s->in->extended_data[1];
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float *windowed_left = (float *)s->windowed_frame->extended_data[0];
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float *windowed_right = (float *)s->windowed_frame->extended_data[1];
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float *windowed_oleft = (float *)s->windowed_out->extended_data[0];
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float *windowed_oright = (float *)s->windowed_out->extended_data[1];
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float *windowed_pleft = (float *)s->windowed_prev->extended_data[0];
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float *windowed_pright = (float *)s->windowed_prev->extended_data[1];
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float *left_osamples = (float *)out->extended_data[0];
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float *right_osamples = (float *)out->extended_data[1];
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float *center_osamples = (float *)out->extended_data[2];
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const int offset = s->fft_size - s->overlap;
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float vad;
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// shift in/out buffers
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memmove(left_in, &left_in[s->overlap], offset * sizeof(float));
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memmove(right_in, &right_in[s->overlap], offset * sizeof(float));
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memmove(left_out, &left_out[s->overlap], offset * sizeof(float));
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memmove(right_out, &right_out[s->overlap], offset * sizeof(float));
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memcpy(&left_in[offset], left_samples, s->overlap * sizeof(float));
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memcpy(&right_in[offset], right_samples, s->overlap * sizeof(float));
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memset(&left_out[offset], 0, s->overlap * sizeof(float));
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memset(&right_out[offset], 0, s->overlap * sizeof(float));
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apply_window(s, left_in, windowed_left, 0);
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apply_window(s, right_in, windowed_right, 0);
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s->tx_fn(s->tx_ctx[0], windowed_oleft, windowed_left, sizeof(float));
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s->tx_fn(s->tx_ctx[1], windowed_oright, windowed_right, sizeof(float));
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get_centere((AVComplexFloat *)windowed_oleft,
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(AVComplexFloat *)windowed_oright,
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(AVComplexFloat *)center,
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s->fft_size / 2 + 1);
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vad = calc_vad(flux(center, center_prev, s->fft_size / 2 + 1),
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fluxlr(windowed_oleft, windowed_pleft,
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windowed_oright, windowed_pright, s->fft_size / 2 + 1), s->voice);
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vad = vad * 0.1 + 0.9 * s->prev_vad;
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s->prev_vad = vad;
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memcpy(center_prev, center, s->fft_size * sizeof(float));
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memcpy(windowed_pleft, windowed_oleft, s->fft_size * sizeof(float));
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memcpy(windowed_pright, windowed_oright, s->fft_size * sizeof(float));
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get_final(center, windowed_oleft, windowed_oright, vad, s->fft_size / 2 + 1,
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s->original, s->enhance);
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s->itx_fn(s->itx_ctx, windowed_oleft, center, sizeof(float));
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apply_window(s, windowed_oleft, left_out, 1);
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for (int i = 0; i < s->overlap; i++) {
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// 4 times overlap with squared hanning window results in 1.5 time increase in amplitude
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if (!ctx->is_disabled)
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center_osamples[i] = left_out[i] / 1.5f;
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else
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center_osamples[i] = 0.f;
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left_osamples[i] = left_in[i];
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right_osamples[i] = right_in[i];
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}
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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AVFilterContext *ctx = inlink->dst;
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AVFilterLink *outlink = ctx->outputs[0];
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AudioDialogueEnhanceContext *s = ctx->priv;
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AVFrame *out;
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int ret;
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out = ff_get_audio_buffer(outlink, s->overlap);
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if (!out) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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s->in = in;
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de_stereo(ctx, out);
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out->pts = in->pts;
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out->nb_samples = in->nb_samples;
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ret = ff_filter_frame(outlink, out);
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fail:
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av_frame_free(&in);
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s->in = NULL;
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return ret < 0 ? ret : 0;
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}
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static int activate(AVFilterContext *ctx)
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{
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AVFilterLink *inlink = ctx->inputs[0];
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AVFilterLink *outlink = ctx->outputs[0];
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AudioDialogueEnhanceContext *s = ctx->priv;
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AVFrame *in = NULL;
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int ret = 0, status;
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int64_t pts;
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FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
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ret = ff_inlink_consume_samples(inlink, s->overlap, s->overlap, &in);
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if (ret < 0)
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return ret;
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if (ret > 0) {
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return filter_frame(inlink, in);
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} else if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
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ff_outlink_set_status(outlink, status, pts);
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return 0;
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} else {
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if (ff_inlink_queued_samples(inlink) >= s->overlap) {
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ff_filter_set_ready(ctx, 10);
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} else if (ff_outlink_frame_wanted(outlink)) {
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ff_inlink_request_frame(inlink);
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}
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return 0;
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}
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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AudioDialogueEnhanceContext *s = ctx->priv;
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av_freep(&s->window);
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av_frame_free(&s->in_frame);
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av_frame_free(&s->center_frame);
|
||||
av_frame_free(&s->out_dist_frame);
|
||||
av_frame_free(&s->windowed_frame);
|
||||
av_frame_free(&s->windowed_out);
|
||||
av_frame_free(&s->windowed_prev);
|
||||
|
||||
av_tx_uninit(&s->tx_ctx[0]);
|
||||
av_tx_uninit(&s->tx_ctx[1]);
|
||||
av_tx_uninit(&s->itx_ctx);
|
||||
}
|
||||
|
||||
static const AVFilterPad inputs[] = {
|
||||
{
|
||||
.name = "default",
|
||||
.type = AVMEDIA_TYPE_AUDIO,
|
||||
.config_props = config_input,
|
||||
},
|
||||
};
|
||||
|
||||
static const AVFilterPad outputs[] = {
|
||||
{
|
||||
.name = "default",
|
||||
.type = AVMEDIA_TYPE_AUDIO,
|
||||
},
|
||||
};
|
||||
|
||||
const AVFilter ff_af_dialoguenhance = {
|
||||
.name = "dialoguenhance",
|
||||
.description = NULL_IF_CONFIG_SMALL("Audio Dialogue Enhancement."),
|
||||
.priv_size = sizeof(AudioDialogueEnhanceContext),
|
||||
.priv_class = &dialoguenhance_class,
|
||||
.uninit = uninit,
|
||||
FILTER_INPUTS(inputs),
|
||||
FILTER_OUTPUTS(outputs),
|
||||
FILTER_QUERY_FUNC(query_formats),
|
||||
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
|
||||
.activate = activate,
|
||||
.process_command = ff_filter_process_command,
|
||||
};
|
||||
|
|
@ -115,6 +115,7 @@ extern const AVFilter ff_af_crossfeed;
|
|||
extern const AVFilter ff_af_crystalizer;
|
||||
extern const AVFilter ff_af_dcshift;
|
||||
extern const AVFilter ff_af_deesser;
|
||||
extern const AVFilter ff_af_dialoguenhance;
|
||||
extern const AVFilter ff_af_drmeter;
|
||||
extern const AVFilter ff_af_dynaudnorm;
|
||||
extern const AVFilter ff_af_earwax;
|
||||
|
|
|
|||
|
|
@ -30,8 +30,8 @@
|
|||
#include "libavutil/version.h"
|
||||
|
||||
#define LIBAVFILTER_VERSION_MAJOR 8
|
||||
#define LIBAVFILTER_VERSION_MINOR 26
|
||||
#define LIBAVFILTER_VERSION_MICRO 101
|
||||
#define LIBAVFILTER_VERSION_MINOR 27
|
||||
#define LIBAVFILTER_VERSION_MICRO 100
|
||||
|
||||
|
||||
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
|
||||
|
|
|
|||
Loading…
Reference in New Issue