Paul B Mahol
3 years ago
parent
800dfd2eac
commit
f05c52985c
6 changed files with 441 additions and 3 deletions
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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); |
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av_frame_free(&s->out_dist_frame); |
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av_frame_free(&s->windowed_frame); |
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av_frame_free(&s->windowed_out); |
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av_frame_free(&s->windowed_prev); |
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av_tx_uninit(&s->tx_ctx[0]); |
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av_tx_uninit(&s->tx_ctx[1]); |
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av_tx_uninit(&s->itx_ctx); |
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} |
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static const AVFilterPad inputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_AUDIO, |
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.config_props = config_input, |
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}, |
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}; |
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static const AVFilterPad outputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_AUDIO, |
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}, |
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}; |
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const AVFilter ff_af_dialoguenhance = { |
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.name = "dialoguenhance", |
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.description = NULL_IF_CONFIG_SMALL("Audio Dialogue Enhancement."), |
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.priv_size = sizeof(AudioDialogueEnhanceContext), |
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.priv_class = &dialoguenhance_class, |
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.uninit = uninit, |
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FILTER_INPUTS(inputs), |
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FILTER_OUTPUTS(outputs), |
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FILTER_QUERY_FUNC(query_formats), |
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL, |
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.activate = activate, |
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.process_command = ff_filter_process_command, |
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}; |
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