mirror of https://github.com/FFmpeg/FFmpeg.git
Paul B Mahol
4 years ago
parent
129978af6b
commit
579e4e57a2
6 changed files with 377 additions and 1 deletions
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/*
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* Copyright (c) Markus Schmidt and Christian Holschuh |
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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 |
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* License 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 GNU |
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* 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 |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/opt.h" |
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#include "avfilter.h" |
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#include "internal.h" |
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#include "audio.h" |
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typedef struct ChannelParams { |
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double blend_old, drive_old; |
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double rdrive, rbdr, kpa, kpb, kna, knb, ap, |
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an, imr, kc, srct, sq, pwrq; |
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double prev_med, prev_out; |
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double hp[5], lp[5]; |
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double hw[4][2], lw[2][2]; |
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} ChannelParams; |
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typedef struct AExciterContext { |
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const AVClass *class; |
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double level_in; |
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double level_out; |
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double amount; |
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double drive; |
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double blend; |
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double freq; |
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double ceil; |
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int listen; |
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ChannelParams *cp; |
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} AExciterContext; |
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#define OFFSET(x) offsetof(AExciterContext, x) |
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#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM |
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static const AVOption aexciter_options[] = { |
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{ "level_in", "set level in", OFFSET(level_in), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 64, A }, |
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{ "level_out", "set level out", OFFSET(level_out), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 64, A }, |
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{ "amount", "set amount", OFFSET(amount), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 64, A }, |
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{ "drive", "set harmonics", OFFSET(drive), AV_OPT_TYPE_DOUBLE, {.dbl=8.5}, 0.1, 10, A }, |
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{ "blend", "set blend harmonics", OFFSET(blend), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -10, 10, A }, |
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{ "freq", "set scope", OFFSET(freq), AV_OPT_TYPE_DOUBLE, {.dbl=7500}, 2000, 12000, A }, |
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{ "ceil", "set ceiling", OFFSET(ceil), AV_OPT_TYPE_DOUBLE, {.dbl=9999}, 9999, 20000, A }, |
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{ "listen", "enable listen mode", OFFSET(listen), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A }, |
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{ NULL } |
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}; |
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AVFILTER_DEFINE_CLASS(aexciter); |
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static inline double M(double x) |
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{ |
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return (fabs(x) > 0.00000001) ? x : 0.0; |
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} |
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static inline double D(double x) |
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{ |
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x = fabs(x); |
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return (x > 0.00000001) ? sqrt(x) : 0.0; |
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} |
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static void set_params(ChannelParams *p, |
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double blend, double drive, |
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double srate, double freq, |
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double ceil) |
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{ |
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double a0, a1, a2, b0, b1, b2, w0, alpha; |
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p->rdrive = 12.0 / drive; |
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p->rbdr = p->rdrive / (10.5 - blend) * 780.0 / 33.0; |
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p->kpa = D(2.0 * (p->rdrive*p->rdrive) - 1.0) + 1.0; |
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p->kpb = (2.0 - p->kpa) / 2.0; |
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p->ap = ((p->rdrive*p->rdrive) - p->kpa + 1.0) / 2.0; |
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p->kc = p->kpa / D(2.0 * D(2.0 * (p->rdrive*p->rdrive) - 1.0) - 2.0 * p->rdrive*p->rdrive); |
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p->srct = (0.1 * srate) / (0.1 * srate + 1.0); |
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p->sq = p->kc*p->kc + 1.0; |
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p->knb = -1.0 * p->rbdr / D(p->sq); |
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p->kna = 2.0 * p->kc * p->rbdr / D(p->sq); |
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p->an = p->rbdr*p->rbdr / p->sq; |
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p->imr = 2.0 * p->knb + D(2.0 * p->kna + 4.0 * p->an - 1.0); |
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p->pwrq = 2.0 / (p->imr + 1.0); |
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w0 = 2 * M_PI * freq / srate; |
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alpha = sin(w0) / (2. * 0.707); |
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a0 = 1 + alpha; |
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a1 = -2 * cos(w0); |
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a2 = 1 - alpha; |
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b0 = (1 + cos(w0)) / 2; |
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b1 = -(1 + cos(w0)); |
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b2 = (1 + cos(w0)) / 2; |
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p->hp[0] =-a1 / a0; |
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p->hp[1] =-a2 / a0; |
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p->hp[2] = b0 / a0; |
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p->hp[3] = b1 / a0; |
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p->hp[4] = b2 / a0; |
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w0 = 2 * M_PI * ceil / srate; |
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alpha = sin(w0) / (2. * 0.707); |
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a0 = 1 + alpha; |
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a1 = -2 * cos(w0); |
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a2 = 1 - alpha; |
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b0 = (1 - cos(w0)) / 2; |
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b1 = 1 - cos(w0); |
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b2 = (1 - cos(w0)) / 2; |
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p->lp[0] =-a1 / a0; |
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p->lp[1] =-a2 / a0; |
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p->lp[2] = b0 / a0; |
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p->lp[3] = b1 / a0; |
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p->lp[4] = b2 / a0; |
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} |
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static double bprocess(double in, const double *const c, |
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double *w1, double *w2) |
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{ |
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double out = c[2] * in + *w1; |
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*w1 = c[3] * in + *w2 + c[0] * out; |
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*w2 = c[4] * in + c[1] * out; |
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return out; |
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} |
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static double distortion_process(AExciterContext *s, ChannelParams *p, double in) |
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{ |
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double proc = in, med; |
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proc = bprocess(proc, p->hp, &p->hw[0][0], &p->hw[0][1]); |
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proc = bprocess(proc, p->hp, &p->hw[1][0], &p->hw[1][1]); |
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if (proc >= 0.0) { |
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med = (D(p->ap + proc * (p->kpa - proc)) + p->kpb) * p->pwrq; |
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} else { |
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med = (D(p->an - proc * (p->kna + proc)) + p->knb) * p->pwrq * -1.0; |
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} |
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proc = p->srct * (med - p->prev_med + p->prev_out); |
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p->prev_med = M(med); |
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p->prev_out = M(proc); |
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proc = bprocess(proc, p->hp, &p->hw[2][0], &p->hw[2][1]); |
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proc = bprocess(proc, p->hp, &p->hw[3][0], &p->hw[3][1]); |
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if (s->ceil >= 10000.) { |
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proc = bprocess(proc, p->lp, &p->lw[0][0], &p->lw[0][1]); |
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proc = bprocess(proc, p->lp, &p->lw[1][0], &p->lw[1][1]); |
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} |
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return proc; |
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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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AExciterContext *s = ctx->priv; |
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AVFilterLink *outlink = ctx->outputs[0]; |
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AVFrame *out; |
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const double *src = (const double *)in->data[0]; |
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const double level_in = s->level_in; |
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const double level_out = s->level_out; |
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const double amount = s->amount; |
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const double listen = 1.0 - s->listen; |
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double *dst; |
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if (av_frame_is_writable(in)) { |
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out = in; |
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} else { |
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out = ff_get_audio_buffer(inlink, in->nb_samples); |
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if (!out) { |
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av_frame_free(&in); |
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return AVERROR(ENOMEM); |
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} |
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av_frame_copy_props(out, in); |
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} |
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dst = (double *)out->data[0]; |
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for (int n = 0; n < in->nb_samples; n++) { |
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for (int c = 0; c < inlink->channels; c++) { |
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double sample = src[c] * level_in; |
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sample = distortion_process(s, &s->cp[c], sample); |
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sample = sample * amount + listen * src[c]; |
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sample *= level_out; |
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if (ctx->is_disabled) |
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dst[c] = src[c]; |
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else |
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dst[c] = sample; |
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} |
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src += inlink->channels; |
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dst += inlink->channels; |
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} |
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if (in != out) |
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av_frame_free(&in); |
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return ff_filter_frame(outlink, out); |
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} |
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static int query_formats(AVFilterContext *ctx) |
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{ |
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AVFilterFormats *formats; |
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AVFilterChannelLayouts *layouts; |
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static const enum AVSampleFormat sample_fmts[] = { |
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AV_SAMPLE_FMT_DBL, |
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AV_SAMPLE_FMT_NONE |
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}; |
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int ret; |
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layouts = ff_all_channel_counts(); |
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if (!layouts) |
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return AVERROR(ENOMEM); |
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ret = ff_set_common_channel_layouts(ctx, layouts); |
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if (ret < 0) |
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return ret; |
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formats = ff_make_format_list(sample_fmts); |
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if (!formats) |
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return AVERROR(ENOMEM); |
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ret = ff_set_common_formats(ctx, formats); |
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if (ret < 0) |
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return ret; |
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formats = ff_all_samplerates(); |
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if (!formats) |
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return AVERROR(ENOMEM); |
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return ff_set_common_samplerates(ctx, formats); |
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} |
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static av_cold void uninit(AVFilterContext *ctx) |
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{ |
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AExciterContext *s = ctx->priv; |
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av_freep(&s->cp); |
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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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AExciterContext *s = ctx->priv; |
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if (!s->cp) |
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s->cp = av_calloc(inlink->channels, sizeof(*s->cp)); |
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if (!s->cp) |
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return AVERROR(ENOMEM); |
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for (int i = 0; i < inlink->channels; i++) |
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set_params(&s->cp[i], s->blend, s->drive, inlink->sample_rate, |
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s->freq, s->ceil); |
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return 0; |
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} |
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static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, |
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char *res, int res_len, int flags) |
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{ |
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AVFilterLink *inlink = ctx->inputs[0]; |
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int ret; |
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ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags); |
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if (ret < 0) |
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return ret; |
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return config_input(inlink); |
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} |
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static const AVFilterPad avfilter_af_aexciter_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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.filter_frame = filter_frame, |
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}, |
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{ NULL } |
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}; |
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static const AVFilterPad avfilter_af_aexciter_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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{ NULL } |
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}; |
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AVFilter ff_af_aexciter = { |
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.name = "aexciter", |
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.description = NULL_IF_CONFIG_SMALL("Enhance high frequency part of audio."), |
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.priv_size = sizeof(AExciterContext), |
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.priv_class = &aexciter_class, |
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.uninit = uninit, |
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.query_formats = query_formats, |
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.inputs = avfilter_af_aexciter_inputs, |
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.outputs = avfilter_af_aexciter_outputs, |
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.process_command = process_command, |
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL, |
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}; |
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