avfilter/af_dialoguenhance: add double-floating point sample format support

libavfilter/dialoguenhance_template.c

+/*
+ * 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;
+}