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FFmpeg/libavfilter/dialoguenhance_template.c

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/*
* 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/tx.h"
#include "avfilter.h"
#include "internal.h"
#include "audio.h"
#undef ctype
#undef ftype
#undef SQRT
#undef HYPOT
#undef SAMPLE_FORMAT
#undef TX_TYPE
#undef ONE
#undef ZERO
#undef HALF
#undef SIN
#undef CLIP
#undef EPSILON
#if DEPTH == 32
#define SAMPLE_FORMAT float
#define SQRT sqrtf
#define HYPOT hypotf
#define ctype AVComplexFloat
#define ftype float
#define TX_TYPE AV_TX_FLOAT_RDFT
#define ONE 1.f
#define ZERO 0.f
#define HALF 0.5f
#define SIN sinf
#define CLIP av_clipf
#define EPSILON FLT_EPSILON
#else
#define SAMPLE_FORMAT double
#define SQRT sqrt
#define HYPOT hypot
#define ctype AVComplexDouble
#define ftype double
#define TX_TYPE AV_TX_DOUBLE_RDFT
#define ONE 1.0
#define ZERO 0.0
#define HALF 0.5
#define SIN sin
#define CLIP av_clipd
#define EPSILON DBL_EPSILON
#endif
#define fn3(a,b) a##_##b
#define fn2(a,b) fn3(a,b)
#define fn(a) fn2(a, SAMPLE_FORMAT)
static int fn(de_tx_init)(AVFilterContext *ctx)
{
AudioDialogueEnhanceContext *s = ctx->priv;
ftype scale = ONE, iscale = ONE / (s->fft_size * 1.5f);
int ret;
s->window = av_calloc(s->fft_size, sizeof(ftype));
if (!s->window)
return AVERROR(ENOMEM);
fn(s->window) = s->window;
for (int n = 0; n < s->fft_size; n++)
fn(s->window)[n] = SIN(M_PI*n/(s->fft_size-1));
ret = av_tx_init(&s->tx_ctx[0], &s->tx_fn, TX_TYPE, 0, s->fft_size, &scale, 0);
if (ret < 0)
return ret;
ret = av_tx_init(&s->tx_ctx[1], &s->tx_fn, TX_TYPE, 0, s->fft_size, &scale, 0);
if (ret < 0)
return ret;
ret = av_tx_init(&s->itx_ctx, &s->itx_fn, TX_TYPE, 1, s->fft_size, &iscale, 0);
if (ret < 0)
return ret;
return 0;
}
static void fn(apply_window)(AudioDialogueEnhanceContext *s,
const ftype *in_frame, ftype *out_frame, const int add_to_out_frame)
{
const ftype *window = fn(s->window);
const int fft_size = s->fft_size;
if (add_to_out_frame) {
for (int i = 0; i < fft_size; i++)
out_frame[i] += in_frame[i] * window[i];
} else {
for (int i = 0; i < fft_size; i++)
out_frame[i] = in_frame[i] * window[i];
}
}
static ftype fn(sqr)(ftype x)
{
return x * x;
}
static void fn(get_centere)(ctype *left, ctype *right,
ctype *center, int N)
{
for (int i = 0; i < N; i++) {
const ftype l_re = left[i].re;
const ftype l_im = left[i].im;
const ftype r_re = right[i].re;
const ftype r_im = right[i].im;
const ftype a = HALF * (ONE - SQRT((fn(sqr)(l_re - r_re) + fn(sqr)(l_im - r_im))/
(fn(sqr)(l_re + r_re) + fn(sqr)(l_im + r_im) + EPSILON)));
center[i].re = a * (l_re + r_re);
center[i].im = a * (l_im + r_im);
}
}
static ftype fn(flux)(ftype *curf, ftype *prevf, int N)
{
ctype *cur = (ctype *)curf;
ctype *prev = (ctype *)prevf;
ftype sum = ZERO;
for (int i = 0; i < N; i++) {
ftype c_re = cur[i].re;
ftype c_im = cur[i].im;
ftype p_re = prev[i].re;
ftype p_im = prev[i].im;
sum += fn(sqr)(HYPOT(c_re, c_im) - HYPOT(p_re, p_im));
}
return sum;
}
static ftype fn(fluxlr)(ftype *lf, ftype *lpf,
ftype *rf, ftype *rpf,
int N)
{
ctype *l = (ctype *)lf;
ctype *lp = (ctype *)lpf;
ctype *r = (ctype *)rf;
ctype *rp = (ctype *)rpf;
ftype sum = ZERO;
for (int i = 0; i < N; i++) {
ftype c_re = l[i].re - r[i].re;
ftype c_im = l[i].im - r[i].im;
ftype p_re = lp[i].re - rp[i].re;
ftype p_im = lp[i].im - rp[i].im;
sum += fn(sqr)(HYPOT(c_re, c_im) - HYPOT(p_re, p_im));
}
return sum;
}
static ftype fn(calc_vad)(ftype fc, ftype flr, ftype a)
{
const ftype vad = a * (fc / (fc + flr) - HALF);
return CLIP(vad, ZERO, ONE);
}
static void fn(get_final)(ftype *c, ftype *l,
ftype *r, ftype vad, int N,
ftype original, ftype enhance)
{
ctype *center = (ctype *)c;
ctype *left = (ctype *)l;
ctype *right = (ctype *)r;
for (int i = 0; i < N; i++) {
ftype cP = fn(sqr)(center[i].re) + fn(sqr)(center[i].im);
ftype lrP = fn(sqr)(left[i].re - right[i].re) + fn(sqr)(left[i].im - right[i].im);
ftype G = cP / (cP + lrP + EPSILON);
ftype re, im;
re = center[i].re * (original + vad * G * enhance);
im = center[i].im * (original + vad * G * enhance);
center[i].re = re;
center[i].im = im;
}
}
static int fn(de_stereo)(AVFilterContext *ctx, AVFrame *out)
{
AudioDialogueEnhanceContext *s = ctx->priv;
ftype *center = (ftype *)s->center_frame->extended_data[0];
ftype *center_prev = (ftype *)s->center_frame->extended_data[1];
ftype *left_in = (ftype *)s->in_frame->extended_data[0];
ftype *right_in = (ftype *)s->in_frame->extended_data[1];
ftype *left_out = (ftype *)s->out_dist_frame->extended_data[0];
ftype *right_out = (ftype *)s->out_dist_frame->extended_data[1];
ftype *left_samples = (ftype *)s->in->extended_data[0];
ftype *right_samples = (ftype *)s->in->extended_data[1];
ftype *windowed_left = (ftype *)s->windowed_frame->extended_data[0];
ftype *windowed_right = (ftype *)s->windowed_frame->extended_data[1];
ftype *windowed_oleft = (ftype *)s->windowed_out->extended_data[0];
ftype *windowed_oright = (ftype *)s->windowed_out->extended_data[1];
ftype *windowed_pleft = (ftype *)s->windowed_prev->extended_data[0];
ftype *windowed_pright = (ftype *)s->windowed_prev->extended_data[1];
ftype *left_osamples = (ftype *)out->extended_data[0];
ftype *right_osamples = (ftype *)out->extended_data[1];
ftype *center_osamples = (ftype *)out->extended_data[2];
const int overlap = s->overlap;
const int offset = s->fft_size - overlap;
const int nb_samples = FFMIN(overlap, s->in->nb_samples);
ftype vad;
// shift in/out buffers
memmove(left_in, &left_in[overlap], offset * sizeof(ftype));
memmove(right_in, &right_in[overlap], offset * sizeof(ftype));
memmove(left_out, &left_out[overlap], offset * sizeof(ftype));
memmove(right_out, &right_out[overlap], offset * sizeof(ftype));
memcpy(&left_in[offset], left_samples, nb_samples * sizeof(ftype));
memcpy(&right_in[offset], right_samples, nb_samples * sizeof(ftype));
memset(&left_out[offset], 0, overlap * sizeof(ftype));
memset(&right_out[offset], 0, overlap * sizeof(ftype));
fn(apply_window)(s, left_in, windowed_left, 0);
fn(apply_window)(s, right_in, windowed_right, 0);
s->tx_fn(s->tx_ctx[0], windowed_oleft, windowed_left, sizeof(ftype));
s->tx_fn(s->tx_ctx[1], windowed_oright, windowed_right, sizeof(ftype));
fn(get_centere)((ctype *)windowed_oleft,
(ctype *)windowed_oright,
(ctype *)center,
s->fft_size / 2 + 1);
vad = fn(calc_vad)(fn(flux)(center, center_prev, s->fft_size / 2 + 1),
fn(fluxlr)(windowed_oleft, windowed_pleft,
windowed_oright, windowed_pright, s->fft_size / 2 + 1), s->voice);
vad = vad * 0.1 + 0.9 * fn(s->prev_vad);
fn(s->prev_vad) = vad;
memcpy(center_prev, center, s->fft_size * sizeof(ftype));
memcpy(windowed_pleft, windowed_oleft, s->fft_size * sizeof(ftype));
memcpy(windowed_pright, windowed_oright, s->fft_size * sizeof(ftype));
fn(get_final)(center, windowed_oleft, windowed_oright, vad, s->fft_size / 2 + 1,
s->original, s->enhance);
s->itx_fn(s->itx_ctx, windowed_oleft, center, sizeof(ctype));
fn(apply_window)(s, windowed_oleft, left_out, 1);
memcpy(left_osamples, left_in, overlap * sizeof(ftype));
memcpy(right_osamples, right_in, overlap * sizeof(ftype));
if (ctx->is_disabled)
memset(center_osamples, 0, overlap * sizeof(ftype));
else
memcpy(center_osamples, left_out, overlap * sizeof(ftype));
return 0;
}
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