682 lines
23 KiB
C
682 lines
23 KiB
C
/*
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* Copyright (c) 2001 Heikki Leinonen
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* Copyright (c) 2001 Chris Bagwell
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* Copyright (c) 2003 Donnie Smith
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* Copyright (c) 2014 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
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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 <float.h> /* DBL_MAX */
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#include "libavutil/opt.h"
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#include "libavutil/timestamp.h"
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#include "audio.h"
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#include "formats.h"
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#include "avfilter.h"
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#include "internal.h"
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enum SilenceDetect {
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D_PEAK,
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D_RMS,
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};
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enum ThresholdMode {
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T_ANY,
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T_ALL,
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};
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enum SilenceMode {
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SILENCE_TRIM,
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SILENCE_TRIM_FLUSH,
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SILENCE_COPY,
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SILENCE_COPY_FLUSH,
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SILENCE_STOP
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};
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typedef struct SilenceRemoveContext {
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const AVClass *class;
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enum SilenceMode mode;
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int start_periods;
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int64_t start_duration;
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int64_t start_duration_opt;
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double start_threshold;
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int64_t start_silence;
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int64_t start_silence_opt;
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int start_mode;
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int stop_periods;
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int64_t stop_duration;
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int64_t stop_duration_opt;
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double stop_threshold;
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int64_t stop_silence;
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int64_t stop_silence_opt;
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int stop_mode;
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double *start_holdoff;
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double *start_silence_hold;
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size_t start_holdoff_offset;
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size_t start_holdoff_end;
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size_t start_silence_offset;
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size_t start_silence_end;
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int start_found_periods;
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double *stop_holdoff;
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double *stop_silence_hold;
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size_t stop_holdoff_offset;
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size_t stop_holdoff_end;
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size_t stop_silence_offset;
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size_t stop_silence_end;
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int stop_found_periods;
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double window_ratio;
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double *window;
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double *window_current;
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double *window_end;
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int window_size;
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double sum;
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int restart;
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int64_t next_pts;
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int detection;
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void (*update)(struct SilenceRemoveContext *s, double sample);
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double(*compute)(struct SilenceRemoveContext *s, double sample);
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} SilenceRemoveContext;
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#define OFFSET(x) offsetof(SilenceRemoveContext, x)
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#define AF AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
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static const AVOption silenceremove_options[] = {
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{ "start_periods", NULL, OFFSET(start_periods), AV_OPT_TYPE_INT, {.i64=0}, 0, 9000, AF },
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{ "start_duration", "set start duration of non-silence part", OFFSET(start_duration_opt), AV_OPT_TYPE_DURATION, {.i64=0}, 0, INT32_MAX, AF },
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{ "start_threshold", "set threshold for start silence detection", OFFSET(start_threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, DBL_MAX, AF },
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{ "start_silence", "set start duration of silence part to keep", OFFSET(start_silence_opt), AV_OPT_TYPE_DURATION, {.i64=0}, 0, INT32_MAX, AF },
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{ "start_mode", "set which channel will trigger trimming from start", OFFSET(start_mode), AV_OPT_TYPE_INT, {.i64=T_ANY}, T_ANY, T_ALL, AF, "mode" },
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{ "any", 0, 0, AV_OPT_TYPE_CONST, {.i64=T_ANY}, 0, 0, AF, "mode" },
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{ "all", 0, 0, AV_OPT_TYPE_CONST, {.i64=T_ALL}, 0, 0, AF, "mode" },
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{ "stop_periods", NULL, OFFSET(stop_periods), AV_OPT_TYPE_INT, {.i64=0}, -9000, 9000, AF },
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{ "stop_duration", "set stop duration of non-silence part", OFFSET(stop_duration_opt), AV_OPT_TYPE_DURATION, {.i64=0}, 0, INT32_MAX, AF },
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{ "stop_threshold", "set threshold for stop silence detection", OFFSET(stop_threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, DBL_MAX, AF },
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{ "stop_silence", "set stop duration of silence part to keep", OFFSET(stop_silence_opt), AV_OPT_TYPE_DURATION, {.i64=0}, 0, INT32_MAX, AF },
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{ "stop_mode", "set which channel will trigger trimming from end", OFFSET(stop_mode), AV_OPT_TYPE_INT, {.i64=T_ANY}, T_ANY, T_ALL, AF, "mode" },
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{ "detection", "set how silence is detected", OFFSET(detection), AV_OPT_TYPE_INT, {.i64=D_RMS}, D_PEAK,D_RMS, AF, "detection" },
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{ "peak", "use absolute values of samples", 0, AV_OPT_TYPE_CONST, {.i64=D_PEAK},0, 0, AF, "detection" },
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{ "rms", "use squared values of samples", 0, AV_OPT_TYPE_CONST, {.i64=D_RMS}, 0, 0, AF, "detection" },
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{ "window", "set duration of window in seconds", OFFSET(window_ratio), AV_OPT_TYPE_DOUBLE, {.dbl=0.02}, 0, 10, AF },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(silenceremove);
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static double compute_peak(SilenceRemoveContext *s, double sample)
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{
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double new_sum;
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new_sum = s->sum;
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new_sum -= *s->window_current;
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new_sum += fabs(sample);
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return new_sum / s->window_size;
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}
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static void update_peak(SilenceRemoveContext *s, double sample)
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{
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s->sum -= *s->window_current;
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*s->window_current = fabs(sample);
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s->sum += *s->window_current;
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s->window_current++;
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if (s->window_current >= s->window_end)
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s->window_current = s->window;
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}
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static double compute_rms(SilenceRemoveContext *s, double sample)
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{
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double new_sum;
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new_sum = s->sum;
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new_sum -= *s->window_current;
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new_sum += sample * sample;
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return sqrt(new_sum / s->window_size);
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}
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static void update_rms(SilenceRemoveContext *s, double sample)
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{
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s->sum -= *s->window_current;
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*s->window_current = sample * sample;
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s->sum += *s->window_current;
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s->window_current++;
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if (s->window_current >= s->window_end)
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s->window_current = s->window;
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}
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static av_cold int init(AVFilterContext *ctx)
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{
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SilenceRemoveContext *s = ctx->priv;
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if (s->stop_periods < 0) {
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s->stop_periods = -s->stop_periods;
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s->restart = 1;
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}
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switch (s->detection) {
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case D_PEAK:
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s->update = update_peak;
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s->compute = compute_peak;
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break;
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case D_RMS:
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s->update = update_rms;
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s->compute = compute_rms;
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break;
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}
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return 0;
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}
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static void clear_window(SilenceRemoveContext *s)
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{
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memset(s->window, 0, s->window_size * sizeof(*s->window));
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s->window_current = s->window;
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s->window_end = s->window + s->window_size;
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s->sum = 0;
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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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SilenceRemoveContext *s = ctx->priv;
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s->next_pts = AV_NOPTS_VALUE;
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s->window_size = FFMAX((inlink->sample_rate * s->window_ratio), 1) * inlink->channels;
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s->window = av_malloc_array(s->window_size, sizeof(*s->window));
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if (!s->window)
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return AVERROR(ENOMEM);
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clear_window(s);
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s->start_duration = av_rescale(s->start_duration_opt, inlink->sample_rate,
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AV_TIME_BASE);
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s->start_silence = av_rescale(s->start_silence_opt, inlink->sample_rate,
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AV_TIME_BASE);
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s->stop_duration = av_rescale(s->stop_duration_opt, inlink->sample_rate,
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AV_TIME_BASE);
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s->stop_silence = av_rescale(s->stop_silence_opt, inlink->sample_rate,
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AV_TIME_BASE);
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s->start_holdoff = av_malloc_array(FFMAX(s->start_duration, 1),
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sizeof(*s->start_holdoff) *
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inlink->channels);
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if (!s->start_holdoff)
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return AVERROR(ENOMEM);
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s->start_silence_hold = av_malloc_array(FFMAX(s->start_silence, 1),
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sizeof(*s->start_silence_hold) *
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inlink->channels);
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if (!s->start_silence_hold)
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return AVERROR(ENOMEM);
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s->start_holdoff_offset = 0;
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s->start_holdoff_end = 0;
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s->start_found_periods = 0;
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s->stop_holdoff = av_malloc_array(FFMAX(s->stop_duration, 1),
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sizeof(*s->stop_holdoff) *
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inlink->channels);
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if (!s->stop_holdoff)
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return AVERROR(ENOMEM);
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s->stop_silence_hold = av_malloc_array(FFMAX(s->stop_silence, 1),
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sizeof(*s->stop_silence_hold) *
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inlink->channels);
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if (!s->stop_silence_hold)
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return AVERROR(ENOMEM);
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s->stop_holdoff_offset = 0;
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s->stop_holdoff_end = 0;
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s->stop_found_periods = 0;
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if (s->start_periods)
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s->mode = SILENCE_TRIM;
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else
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s->mode = SILENCE_COPY;
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return 0;
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}
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static void flush(SilenceRemoveContext *s,
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AVFrame *out, AVFilterLink *outlink,
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int *nb_samples_written, int *ret, int flush_silence)
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{
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AVFrame *silence;
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if (*nb_samples_written) {
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out->nb_samples = *nb_samples_written / outlink->channels;
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out->pts = s->next_pts;
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s->next_pts += av_rescale_q(out->nb_samples,
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(AVRational){1, outlink->sample_rate},
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outlink->time_base);
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*ret = ff_filter_frame(outlink, out);
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if (*ret < 0)
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return;
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*nb_samples_written = 0;
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} else {
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av_frame_free(&out);
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}
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if (s->stop_silence_end <= 0 || !flush_silence)
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return;
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silence = ff_get_audio_buffer(outlink, s->stop_silence_end / outlink->channels);
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if (!silence) {
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*ret = AVERROR(ENOMEM);
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return;
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}
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if (s->stop_silence_offset < s->stop_silence_end) {
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memcpy(silence->data[0],
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&s->stop_silence_hold[s->stop_silence_offset],
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(s->stop_silence_end - s->stop_silence_offset) * sizeof(double));
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}
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if (s->stop_silence_offset > 0) {
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memcpy(silence->data[0] + (s->stop_silence_end - s->stop_silence_offset) * sizeof(double),
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&s->stop_silence_hold[0],
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s->stop_silence_offset * sizeof(double));
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}
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s->stop_silence_offset = 0;
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s->stop_silence_end = 0;
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silence->pts = s->next_pts;
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s->next_pts += av_rescale_q(silence->nb_samples,
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(AVRational){1, outlink->sample_rate},
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outlink->time_base);
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*ret = ff_filter_frame(outlink, silence);
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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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SilenceRemoveContext *s = ctx->priv;
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int i, j, threshold, ret = 0;
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int nbs, nb_samples_read, nb_samples_written;
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double *obuf, *ibuf = (double *)in->data[0];
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AVFrame *out;
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nb_samples_read = nb_samples_written = 0;
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if (s->next_pts == AV_NOPTS_VALUE)
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s->next_pts = in->pts;
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switch (s->mode) {
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case SILENCE_TRIM:
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silence_trim:
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nbs = in->nb_samples - nb_samples_read / outlink->channels;
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if (!nbs)
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break;
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for (i = 0; i < nbs; i++) {
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if (s->start_mode == T_ANY) {
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threshold = 0;
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for (j = 0; j < outlink->channels; j++) {
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threshold |= s->compute(s, ibuf[j]) > s->start_threshold;
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}
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} else {
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threshold = 1;
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for (j = 0; j < outlink->channels; j++) {
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threshold &= s->compute(s, ibuf[j]) > s->start_threshold;
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}
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}
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if (threshold) {
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for (j = 0; j < outlink->channels; j++) {
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s->update(s, *ibuf);
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s->start_holdoff[s->start_holdoff_end++] = *ibuf++;
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}
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nb_samples_read += outlink->channels;
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if (s->start_holdoff_end >= s->start_duration * outlink->channels) {
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if (++s->start_found_periods >= s->start_periods) {
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s->mode = SILENCE_TRIM_FLUSH;
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goto silence_trim_flush;
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}
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s->start_holdoff_offset = 0;
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s->start_holdoff_end = 0;
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s->start_silence_offset = 0;
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s->start_silence_end = 0;
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}
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} else {
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s->start_holdoff_end = 0;
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for (j = 0; j < outlink->channels; j++) {
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s->update(s, ibuf[j]);
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if (s->start_silence) {
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s->start_silence_hold[s->start_silence_offset++] = ibuf[j];
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s->start_silence_end = FFMIN(s->start_silence_end + 1, outlink->channels * s->start_silence);
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if (s->start_silence_offset >= outlink->channels * s->start_silence) {
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s->start_silence_offset = 0;
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}
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}
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}
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ibuf += outlink->channels;
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nb_samples_read += outlink->channels;
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}
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}
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break;
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case SILENCE_TRIM_FLUSH:
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silence_trim_flush:
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nbs = s->start_holdoff_end - s->start_holdoff_offset;
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nbs -= nbs % outlink->channels;
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if (!nbs)
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break;
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out = ff_get_audio_buffer(outlink, nbs / outlink->channels + s->start_silence_end / outlink->channels);
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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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if (s->start_silence_end > 0) {
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if (s->start_silence_offset < s->start_silence_end) {
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memcpy(out->data[0],
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&s->start_silence_hold[s->start_silence_offset],
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(s->start_silence_end - s->start_silence_offset) * sizeof(double));
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}
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if (s->start_silence_offset > 0) {
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memcpy(out->data[0] + (s->start_silence_end - s->start_silence_offset) * sizeof(double),
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&s->start_silence_hold[0],
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s->start_silence_offset * sizeof(double));
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}
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}
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memcpy(out->data[0] + s->start_silence_end * sizeof(double),
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&s->start_holdoff[s->start_holdoff_offset],
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nbs * sizeof(double));
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out->pts = s->next_pts;
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s->next_pts += av_rescale_q(out->nb_samples,
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(AVRational){1, outlink->sample_rate},
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outlink->time_base);
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s->start_holdoff_offset += nbs;
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ret = ff_filter_frame(outlink, out);
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if (s->start_holdoff_offset == s->start_holdoff_end) {
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s->start_holdoff_offset = 0;
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s->start_holdoff_end = 0;
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s->start_silence_offset = 0;
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s->start_silence_end = 0;
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s->mode = SILENCE_COPY;
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goto silence_copy;
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}
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break;
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case SILENCE_COPY:
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silence_copy:
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nbs = in->nb_samples - nb_samples_read / outlink->channels;
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if (!nbs)
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break;
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out = ff_get_audio_buffer(outlink, nbs);
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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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obuf = (double *)out->data[0];
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if (s->stop_periods) {
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for (i = 0; i < nbs; i++) {
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if (s->stop_mode == T_ANY) {
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threshold = 0;
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for (j = 0; j < outlink->channels; j++) {
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threshold |= s->compute(s, ibuf[j]) > s->stop_threshold;
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}
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} else {
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threshold = 1;
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for (j = 0; j < outlink->channels; j++) {
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threshold &= s->compute(s, ibuf[j]) > s->stop_threshold;
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}
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}
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if (threshold && s->stop_holdoff_end && !s->stop_silence) {
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s->mode = SILENCE_COPY_FLUSH;
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flush(s, out, outlink, &nb_samples_written, &ret, 0);
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goto silence_copy_flush;
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} else if (threshold) {
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for (j = 0; j < outlink->channels; j++) {
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s->update(s, *ibuf);
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*obuf++ = *ibuf++;
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}
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nb_samples_read += outlink->channels;
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nb_samples_written += outlink->channels;
|
|
} else if (!threshold) {
|
|
for (j = 0; j < outlink->channels; j++) {
|
|
s->update(s, *ibuf);
|
|
if (s->stop_silence) {
|
|
s->stop_silence_hold[s->stop_silence_offset++] = *ibuf;
|
|
s->stop_silence_end = FFMIN(s->stop_silence_end + 1, outlink->channels * s->stop_silence);
|
|
if (s->stop_silence_offset >= outlink->channels * s->stop_silence) {
|
|
s->stop_silence_offset = 0;
|
|
}
|
|
}
|
|
|
|
s->stop_holdoff[s->stop_holdoff_end++] = *ibuf++;
|
|
}
|
|
nb_samples_read += outlink->channels;
|
|
|
|
if (s->stop_holdoff_end >= s->stop_duration * outlink->channels) {
|
|
if (++s->stop_found_periods >= s->stop_periods) {
|
|
s->stop_holdoff_offset = 0;
|
|
s->stop_holdoff_end = 0;
|
|
|
|
if (!s->restart) {
|
|
s->mode = SILENCE_STOP;
|
|
flush(s, out, outlink, &nb_samples_written, &ret, 1);
|
|
goto silence_stop;
|
|
} else {
|
|
s->stop_found_periods = 0;
|
|
s->start_found_periods = 0;
|
|
s->start_holdoff_offset = 0;
|
|
s->start_holdoff_end = 0;
|
|
s->start_silence_offset = 0;
|
|
s->start_silence_end = 0;
|
|
clear_window(s);
|
|
s->mode = SILENCE_TRIM;
|
|
flush(s, out, outlink, &nb_samples_written, &ret, 1);
|
|
goto silence_trim;
|
|
}
|
|
}
|
|
s->mode = SILENCE_COPY_FLUSH;
|
|
flush(s, out, outlink, &nb_samples_written, &ret, 0);
|
|
goto silence_copy_flush;
|
|
}
|
|
}
|
|
}
|
|
flush(s, out, outlink, &nb_samples_written, &ret, 0);
|
|
} else {
|
|
memcpy(obuf, ibuf, sizeof(double) * nbs * outlink->channels);
|
|
|
|
out->pts = s->next_pts;
|
|
s->next_pts += av_rescale_q(out->nb_samples,
|
|
(AVRational){1, outlink->sample_rate},
|
|
outlink->time_base);
|
|
|
|
ret = ff_filter_frame(outlink, out);
|
|
}
|
|
break;
|
|
|
|
case SILENCE_COPY_FLUSH:
|
|
silence_copy_flush:
|
|
nbs = s->stop_holdoff_end - s->stop_holdoff_offset;
|
|
nbs -= nbs % outlink->channels;
|
|
if (!nbs)
|
|
break;
|
|
|
|
out = ff_get_audio_buffer(outlink, nbs / outlink->channels);
|
|
if (!out) {
|
|
av_frame_free(&in);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
memcpy(out->data[0], &s->stop_holdoff[s->stop_holdoff_offset],
|
|
nbs * sizeof(double));
|
|
s->stop_holdoff_offset += nbs;
|
|
|
|
out->pts = s->next_pts;
|
|
s->next_pts += av_rescale_q(out->nb_samples,
|
|
(AVRational){1, outlink->sample_rate},
|
|
outlink->time_base);
|
|
|
|
ret = ff_filter_frame(outlink, out);
|
|
|
|
if (s->stop_holdoff_offset == s->stop_holdoff_end) {
|
|
s->stop_holdoff_offset = 0;
|
|
s->stop_holdoff_end = 0;
|
|
s->stop_silence_offset = 0;
|
|
s->stop_silence_end = 0;
|
|
s->mode = SILENCE_COPY;
|
|
goto silence_copy;
|
|
}
|
|
break;
|
|
case SILENCE_STOP:
|
|
silence_stop:
|
|
break;
|
|
}
|
|
|
|
av_frame_free(&in);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int request_frame(AVFilterLink *outlink)
|
|
{
|
|
AVFilterContext *ctx = outlink->src;
|
|
SilenceRemoveContext *s = ctx->priv;
|
|
int ret;
|
|
|
|
ret = ff_request_frame(ctx->inputs[0]);
|
|
if (ret == AVERROR_EOF && (s->mode == SILENCE_COPY_FLUSH ||
|
|
s->mode == SILENCE_COPY)) {
|
|
int nbs = s->stop_holdoff_end - s->stop_holdoff_offset;
|
|
if (nbs) {
|
|
AVFrame *frame;
|
|
|
|
frame = ff_get_audio_buffer(outlink, nbs / outlink->channels);
|
|
if (!frame)
|
|
return AVERROR(ENOMEM);
|
|
|
|
memcpy(frame->data[0], &s->stop_holdoff[s->stop_holdoff_offset],
|
|
nbs * sizeof(double));
|
|
|
|
frame->pts = s->next_pts;
|
|
s->next_pts += av_rescale_q(frame->nb_samples,
|
|
(AVRational){1, outlink->sample_rate},
|
|
outlink->time_base);
|
|
|
|
ret = ff_filter_frame(outlink, frame);
|
|
}
|
|
s->mode = SILENCE_STOP;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int query_formats(AVFilterContext *ctx)
|
|
{
|
|
AVFilterFormats *formats = NULL;
|
|
AVFilterChannelLayouts *layouts = NULL;
|
|
static const enum AVSampleFormat sample_fmts[] = {
|
|
AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_NONE
|
|
};
|
|
int ret;
|
|
|
|
layouts = ff_all_channel_counts();
|
|
if (!layouts)
|
|
return AVERROR(ENOMEM);
|
|
ret = ff_set_common_channel_layouts(ctx, layouts);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
formats = ff_make_format_list(sample_fmts);
|
|
if (!formats)
|
|
return AVERROR(ENOMEM);
|
|
ret = ff_set_common_formats(ctx, formats);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
formats = ff_all_samplerates();
|
|
if (!formats)
|
|
return AVERROR(ENOMEM);
|
|
return ff_set_common_samplerates(ctx, formats);
|
|
}
|
|
|
|
static av_cold void uninit(AVFilterContext *ctx)
|
|
{
|
|
SilenceRemoveContext *s = ctx->priv;
|
|
|
|
av_freep(&s->start_holdoff);
|
|
av_freep(&s->start_silence_hold);
|
|
av_freep(&s->stop_holdoff);
|
|
av_freep(&s->stop_silence_hold);
|
|
av_freep(&s->window);
|
|
}
|
|
|
|
static const AVFilterPad silenceremove_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.config_props = config_input,
|
|
.filter_frame = filter_frame,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad silenceremove_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.request_frame = request_frame,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter ff_af_silenceremove = {
|
|
.name = "silenceremove",
|
|
.description = NULL_IF_CONFIG_SMALL("Remove silence."),
|
|
.priv_size = sizeof(SilenceRemoveContext),
|
|
.priv_class = &silenceremove_class,
|
|
.init = init,
|
|
.uninit = uninit,
|
|
.query_formats = query_formats,
|
|
.inputs = silenceremove_inputs,
|
|
.outputs = silenceremove_outputs,
|
|
};
|