mirror of https://git.ffmpeg.org/ffmpeg.git
277 lines
8.2 KiB
C
277 lines
8.2 KiB
C
/*
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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/avassert.h"
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#include "libavutil/channel_layout.h"
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#include "libavutil/opt.h"
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#include "audio.h"
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#include "avfilter.h"
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#include "internal.h"
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enum FilterType {
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DC_TYPE,
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AC_TYPE,
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SQ_TYPE,
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PS_TYPE,
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NB_TYPES,
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};
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typedef struct ADenormContext {
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const AVClass *class;
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double level;
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double level_db;
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int type;
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int64_t in_samples;
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void (*filter[NB_TYPES])(AVFilterContext *ctx, void *dst,
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const void *src, int nb_samples);
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} ADenormContext;
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static void dc_denorm_fltp(AVFilterContext *ctx, void *dstp,
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const void *srcp, int nb_samples)
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{
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ADenormContext *s = ctx->priv;
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const float *src = (const float *)srcp;
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float *dst = (float *)dstp;
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const float dc = s->level;
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for (int n = 0; n < nb_samples; n++) {
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dst[n] = src[n] + dc;
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}
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}
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static void dc_denorm_dblp(AVFilterContext *ctx, void *dstp,
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const void *srcp, int nb_samples)
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{
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ADenormContext *s = ctx->priv;
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const double *src = (const double *)srcp;
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double *dst = (double *)dstp;
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const double dc = s->level;
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for (int n = 0; n < nb_samples; n++) {
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dst[n] = src[n] + dc;
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}
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}
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static void ac_denorm_fltp(AVFilterContext *ctx, void *dstp,
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const void *srcp, int nb_samples)
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{
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ADenormContext *s = ctx->priv;
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const float *src = (const float *)srcp;
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float *dst = (float *)dstp;
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const float dc = s->level;
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const int64_t N = s->in_samples;
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for (int n = 0; n < nb_samples; n++) {
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dst[n] = src[n] + dc * (((N + n) & 1) ? -1.f : 1.f);
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}
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}
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static void ac_denorm_dblp(AVFilterContext *ctx, void *dstp,
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const void *srcp, int nb_samples)
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{
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ADenormContext *s = ctx->priv;
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const double *src = (const double *)srcp;
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double *dst = (double *)dstp;
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const double dc = s->level;
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const int64_t N = s->in_samples;
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for (int n = 0; n < nb_samples; n++) {
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dst[n] = src[n] + dc * (((N + n) & 1) ? -1. : 1.);
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}
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}
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static void sq_denorm_fltp(AVFilterContext *ctx, void *dstp,
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const void *srcp, int nb_samples)
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{
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ADenormContext *s = ctx->priv;
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const float *src = (const float *)srcp;
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float *dst = (float *)dstp;
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const float dc = s->level;
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const int64_t N = s->in_samples;
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for (int n = 0; n < nb_samples; n++) {
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dst[n] = src[n] + dc * ((((N + n) >> 8) & 1) ? -1.f : 1.f);
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}
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}
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static void sq_denorm_dblp(AVFilterContext *ctx, void *dstp,
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const void *srcp, int nb_samples)
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{
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ADenormContext *s = ctx->priv;
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const double *src = (const double *)srcp;
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double *dst = (double *)dstp;
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const double dc = s->level;
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const int64_t N = s->in_samples;
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for (int n = 0; n < nb_samples; n++) {
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dst[n] = src[n] + dc * ((((N + n) >> 8) & 1) ? -1. : 1.);
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}
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}
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static void ps_denorm_fltp(AVFilterContext *ctx, void *dstp,
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const void *srcp, int nb_samples)
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{
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ADenormContext *s = ctx->priv;
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const float *src = (const float *)srcp;
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float *dst = (float *)dstp;
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const float dc = s->level;
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const int64_t N = s->in_samples;
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for (int n = 0; n < nb_samples; n++) {
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dst[n] = src[n] + dc * (((N + n) & 255) ? 0.f : 1.f);
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}
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}
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static void ps_denorm_dblp(AVFilterContext *ctx, void *dstp,
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const void *srcp, int nb_samples)
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{
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ADenormContext *s = ctx->priv;
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const double *src = (const double *)srcp;
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double *dst = (double *)dstp;
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const double dc = s->level;
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const int64_t N = s->in_samples;
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for (int n = 0; n < nb_samples; n++) {
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dst[n] = src[n] + dc * (((N + n) & 255) ? 0. : 1.);
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}
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}
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static int config_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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ADenormContext *s = ctx->priv;
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switch (outlink->format) {
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case AV_SAMPLE_FMT_FLTP:
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s->filter[DC_TYPE] = dc_denorm_fltp;
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s->filter[AC_TYPE] = ac_denorm_fltp;
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s->filter[SQ_TYPE] = sq_denorm_fltp;
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s->filter[PS_TYPE] = ps_denorm_fltp;
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break;
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case AV_SAMPLE_FMT_DBLP:
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s->filter[DC_TYPE] = dc_denorm_dblp;
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s->filter[AC_TYPE] = ac_denorm_dblp;
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s->filter[SQ_TYPE] = sq_denorm_dblp;
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s->filter[PS_TYPE] = ps_denorm_dblp;
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break;
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default:
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av_assert0(0);
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}
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return 0;
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}
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typedef struct ThreadData {
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AVFrame *in, *out;
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} ThreadData;
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static int filter_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
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{
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ADenormContext *s = ctx->priv;
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ThreadData *td = arg;
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AVFrame *out = td->out;
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AVFrame *in = td->in;
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const int start = (in->ch_layout.nb_channels * jobnr) / nb_jobs;
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const int end = (in->ch_layout.nb_channels * (jobnr+1)) / nb_jobs;
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for (int ch = start; ch < end; ch++) {
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s->filter[s->type](ctx, out->extended_data[ch],
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in->extended_data[ch],
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in->nb_samples);
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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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ADenormContext *s = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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ThreadData td;
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AVFrame *out;
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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(outlink, 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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s->level = exp(s->level_db / 20. * M_LN10);
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td.in = in; td.out = out;
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ff_filter_execute(ctx, filter_channels, &td, NULL,
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FFMIN(inlink->ch_layout.nb_channels, ff_filter_get_nb_threads(ctx)));
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s->in_samples += in->nb_samples;
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if (out != in)
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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 const AVFilterPad adenorm_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.filter_frame = filter_frame,
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},
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};
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static const AVFilterPad adenorm_outputs[] = {
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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_output,
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},
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};
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#define OFFSET(x) offsetof(ADenormContext, 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 adenorm_options[] = {
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{ "level", "set level", OFFSET(level_db), AV_OPT_TYPE_DOUBLE, {.dbl=-351}, -451, -90, FLAGS },
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{ "type", "set type", OFFSET(type), AV_OPT_TYPE_INT, {.i64=DC_TYPE}, 0, NB_TYPES-1, FLAGS, "type" },
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{ "dc", NULL, 0, AV_OPT_TYPE_CONST, {.i64=DC_TYPE}, 0, 0, FLAGS, "type"},
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{ "ac", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AC_TYPE}, 0, 0, FLAGS, "type"},
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{ "square",NULL, 0, AV_OPT_TYPE_CONST, {.i64=SQ_TYPE}, 0, 0, FLAGS, "type"},
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{ "pulse", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PS_TYPE}, 0, 0, FLAGS, "type"},
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(adenorm);
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const AVFilter ff_af_adenorm = {
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.name = "adenorm",
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.description = NULL_IF_CONFIG_SMALL("Remedy denormals by adding extremely low-level noise."),
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.priv_size = sizeof(ADenormContext),
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FILTER_INPUTS(adenorm_inputs),
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FILTER_OUTPUTS(adenorm_outputs),
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FILTER_SAMPLEFMTS(AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_DBLP),
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.priv_class = &adenorm_class,
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.process_command = ff_filter_process_command,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC |
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AVFILTER_FLAG_SLICE_THREADS,
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};
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