497 lines
18 KiB
C
497 lines
18 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/avassert.h"
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#include "libavutil/mem.h"
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#include "libavutil/opt.h"
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#include "audio.h"
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#include "filters.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_AVG,
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D_RMS,
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D_PEAK,
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D_MEDIAN,
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D_PTP,
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D_DEV,
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D_NB
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};
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enum TimestampMode {
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TS_WRITE,
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TS_COPY,
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TS_NB
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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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typedef struct SilenceRemoveContext {
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const AVClass *class;
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int start_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 stop_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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int64_t window_duration_opt;
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int timestamp_mode;
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int start_found_periods;
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int stop_found_periods;
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int start_sample_count;
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int start_silence_count;
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int stop_sample_count;
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int stop_silence_count;
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AVFrame *start_window;
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AVFrame *stop_window;
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int *start_front;
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int *start_back;
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int *stop_front;
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int *stop_back;
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int64_t window_duration;
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int cache_size;
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int start_window_pos;
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int start_window_size;
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int stop_window_pos;
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int stop_window_size;
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double *start_cache;
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double *stop_cache;
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AVFrame *start_queuef;
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int start_queue_pos;
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int start_queue_size;
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AVFrame *stop_queuef;
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int stop_queue_pos;
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int stop_queue_size;
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int restart;
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int found_nonsilence;
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int64_t next_pts;
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int detection;
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float (*compute_flt)(float *c, float s, float ws, int size, int *front, int *back);
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double (*compute_dbl)(double *c, double s, double ws, int size, int *front, int *back);
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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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#define AFR AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
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static const AVOption silenceremove_options[] = {
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{ "start_periods", "set periods of silence parts to skip from start", 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, AFR },
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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, AFR, .unit = "mode" },
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{ "any", 0, 0, AV_OPT_TYPE_CONST, {.i64=T_ANY}, 0, 0, AFR, .unit = "mode" },
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{ "all", 0, 0, AV_OPT_TYPE_CONST, {.i64=T_ALL}, 0, 0, AFR, .unit = "mode" },
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{ "stop_periods", "set periods of silence parts to skip from end", OFFSET(stop_periods), AV_OPT_TYPE_INT, {.i64=0}, -9000, 9000, AF },
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{ "stop_duration", "set stop duration of 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, AFR },
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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_ALL}, T_ANY, T_ALL, AFR, .unit = "mode" },
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{ "detection", "set how silence is detected", OFFSET(detection), AV_OPT_TYPE_INT, {.i64=D_RMS}, 0, D_NB-1, AF, .unit = "detection" },
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{ "avg", "use mean absolute values of samples", 0, AV_OPT_TYPE_CONST, {.i64=D_AVG}, 0, 0, AF, .unit = "detection" },
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{ "rms", "use root mean squared values of samples", 0, AV_OPT_TYPE_CONST, {.i64=D_RMS}, 0, 0, AF, .unit = "detection" },
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{ "peak", "use max absolute values of samples", 0, AV_OPT_TYPE_CONST, {.i64=D_PEAK},0, 0, AF, .unit = "detection" },
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{ "median", "use median of absolute values of samples", 0, AV_OPT_TYPE_CONST, {.i64=D_MEDIAN},0, 0, AF, .unit = "detection" },
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{ "ptp", "use absolute of max peak to min peak difference", 0, AV_OPT_TYPE_CONST, {.i64=D_PTP}, 0, 0, AF, .unit = "detection" },
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{ "dev", "use standard deviation from values of samples", 0, AV_OPT_TYPE_CONST, {.i64=D_DEV}, 0, 0, AF, .unit = "detection" },
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{ "window", "set duration of window for silence detection", OFFSET(window_duration_opt), AV_OPT_TYPE_DURATION, {.i64=20000}, 0, 100000000, AF },
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{ "timestamp", "set how every output frame timestamp is processed", OFFSET(timestamp_mode), AV_OPT_TYPE_INT, {.i64=TS_WRITE}, 0, TS_NB-1, AF, .unit = "timestamp" },
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{ "write", "full timestamps rewrite, keep only the start time", 0, AV_OPT_TYPE_CONST, {.i64=TS_WRITE}, 0, 0, AF, .unit = "timestamp" },
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{ "copy", "non-dropped frames are left with same timestamp", 0, AV_OPT_TYPE_CONST, {.i64=TS_COPY}, 0, 0, AF, .unit = "timestamp" },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(silenceremove);
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#define DEPTH 32
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#include "silenceremove_template.c"
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#undef DEPTH
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#define DEPTH 64
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#include "silenceremove_template.c"
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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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return 0;
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}
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static void clear_windows(SilenceRemoveContext *s)
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{
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av_samples_set_silence(s->start_window->extended_data, 0,
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s->start_window->nb_samples,
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s->start_window->ch_layout.nb_channels,
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s->start_window->format);
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av_samples_set_silence(s->stop_window->extended_data, 0,
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s->stop_window->nb_samples,
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s->stop_window->ch_layout.nb_channels,
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s->stop_window->format);
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s->start_window_pos = 0;
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s->start_window_size = 0;
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s->stop_window_pos = 0;
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s->stop_window_size = 0;
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s->start_queue_pos = 0;
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s->start_queue_size = 0;
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s->stop_queue_pos = 0;
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s->stop_queue_size = 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_duration = av_rescale(s->window_duration_opt, inlink->sample_rate,
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AV_TIME_BASE);
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s->window_duration = FFMAX(1, s->window_duration);
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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_found_periods = 0;
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s->stop_found_periods = 0;
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return 0;
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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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SilenceRemoveContext *s = ctx->priv;
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switch (s->detection) {
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case D_AVG:
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case D_RMS:
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s->cache_size = 1;
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break;
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case D_DEV:
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s->cache_size = 2;
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break;
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case D_MEDIAN:
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case D_PEAK:
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case D_PTP:
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s->cache_size = s->window_duration;
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break;
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}
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s->start_window = ff_get_audio_buffer(outlink, s->window_duration);
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s->stop_window = ff_get_audio_buffer(outlink, s->window_duration);
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s->start_cache = av_calloc(outlink->ch_layout.nb_channels, s->cache_size * sizeof(*s->start_cache));
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s->stop_cache = av_calloc(outlink->ch_layout.nb_channels, s->cache_size * sizeof(*s->stop_cache));
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if (!s->start_window || !s->stop_window || !s->start_cache || !s->stop_cache)
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return AVERROR(ENOMEM);
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s->start_queuef = ff_get_audio_buffer(outlink, s->start_silence + 1);
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s->stop_queuef = ff_get_audio_buffer(outlink, s->stop_silence + 1);
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if (!s->start_queuef || !s->stop_queuef)
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return AVERROR(ENOMEM);
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s->start_front = av_calloc(outlink->ch_layout.nb_channels, sizeof(*s->start_front));
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s->start_back = av_calloc(outlink->ch_layout.nb_channels, sizeof(*s->start_back));
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s->stop_front = av_calloc(outlink->ch_layout.nb_channels, sizeof(*s->stop_front));
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s->stop_back = av_calloc(outlink->ch_layout.nb_channels, sizeof(*s->stop_back));
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if (!s->start_front || !s->start_back || !s->stop_front || !s->stop_back)
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return AVERROR(ENOMEM);
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clear_windows(s);
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switch (s->detection) {
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case D_AVG:
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s->compute_flt = compute_avg_flt;
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s->compute_dbl = compute_avg_dbl;
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break;
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case D_DEV:
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s->compute_flt = compute_dev_flt;
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s->compute_dbl = compute_dev_dbl;
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break;
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case D_PTP:
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s->compute_flt = compute_ptp_flt;
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s->compute_dbl = compute_ptp_dbl;
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break;
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case D_MEDIAN:
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s->compute_flt = compute_median_flt;
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s->compute_dbl = compute_median_dbl;
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break;
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case D_PEAK:
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s->compute_flt = compute_peak_flt;
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s->compute_dbl = compute_peak_dbl;
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break;
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case D_RMS:
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s->compute_flt = compute_rms_flt;
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s->compute_dbl = compute_rms_dbl;
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break;
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}
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return 0;
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}
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static int filter_frame(AVFilterLink *outlink, AVFrame *in)
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{
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const int nb_channels = outlink->ch_layout.nb_channels;
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AVFilterContext *ctx = outlink->src;
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SilenceRemoveContext *s = ctx->priv;
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int max_out_nb_samples;
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int out_nb_samples = 0;
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int in_nb_samples;
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const double *srcd;
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const float *srcf;
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AVFrame *out;
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double *dstd;
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float *dstf;
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if (s->next_pts == AV_NOPTS_VALUE)
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s->next_pts = in->pts;
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in_nb_samples = in->nb_samples;
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max_out_nb_samples = in->nb_samples +
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s->start_silence +
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s->stop_silence;
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if (max_out_nb_samples <= 0) {
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av_frame_free(&in);
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ff_filter_set_ready(ctx, 100);
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return 0;
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}
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out = ff_get_audio_buffer(outlink, max_out_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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if (s->timestamp_mode == TS_WRITE)
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out->pts = s->next_pts;
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else
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out->pts = in->pts;
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switch (outlink->format) {
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case AV_SAMPLE_FMT_FLT:
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srcf = (const float *)in->data[0];
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dstf = (float *)out->data[0];
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if (s->start_periods > 0 && s->stop_periods > 0) {
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const float *src = srcf;
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if (s->start_found_periods >= 0) {
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for (int n = 0; n < in_nb_samples; n++) {
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filter_start_flt(ctx, src + n * nb_channels,
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dstf, &out_nb_samples,
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nb_channels);
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}
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in_nb_samples = out_nb_samples;
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out_nb_samples = 0;
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src = dstf;
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}
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for (int n = 0; n < in_nb_samples; n++) {
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filter_stop_flt(ctx, src + n * nb_channels,
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dstf, &out_nb_samples,
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nb_channels);
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}
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} else if (s->start_periods > 0) {
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for (int n = 0; n < in_nb_samples; n++) {
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filter_start_flt(ctx, srcf + n * nb_channels,
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dstf, &out_nb_samples,
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nb_channels);
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}
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} else if (s->stop_periods > 0) {
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for (int n = 0; n < in_nb_samples; n++) {
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filter_stop_flt(ctx, srcf + n * nb_channels,
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dstf, &out_nb_samples,
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nb_channels);
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}
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}
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break;
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case AV_SAMPLE_FMT_DBL:
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srcd = (const double *)in->data[0];
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dstd = (double *)out->data[0];
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if (s->start_periods > 0 && s->stop_periods > 0) {
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const double *src = srcd;
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if (s->start_found_periods >= 0) {
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for (int n = 0; n < in_nb_samples; n++) {
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filter_start_dbl(ctx, src + n * nb_channels,
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dstd, &out_nb_samples,
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nb_channels);
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}
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in_nb_samples = out_nb_samples;
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out_nb_samples = 0;
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src = dstd;
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}
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for (int n = 0; n < in_nb_samples; n++) {
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filter_stop_dbl(ctx, src + n * nb_channels,
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dstd, &out_nb_samples,
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nb_channels);
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}
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} else if (s->start_periods > 0) {
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for (int n = 0; n < in_nb_samples; n++) {
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filter_start_dbl(ctx, srcd + n * nb_channels,
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dstd, &out_nb_samples,
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nb_channels);
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}
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} else if (s->stop_periods > 0) {
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for (int n = 0; n < in_nb_samples; n++) {
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filter_stop_dbl(ctx, srcd + n * nb_channels,
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dstd, &out_nb_samples,
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nb_channels);
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}
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}
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break;
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}
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av_frame_free(&in);
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if (out_nb_samples > 0) {
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s->next_pts += out_nb_samples;
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out->nb_samples = out_nb_samples;
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return ff_filter_frame(outlink, out);
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}
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av_frame_free(&out);
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ff_filter_set_ready(ctx, 100);
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return 0;
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}
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static int activate(AVFilterContext *ctx)
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{
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AVFilterLink *outlink = ctx->outputs[0];
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AVFilterLink *inlink = ctx->inputs[0];
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SilenceRemoveContext *s = ctx->priv;
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AVFrame *in;
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int ret;
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FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
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ret = ff_inlink_consume_frame(inlink, &in);
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if (ret < 0)
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return ret;
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if (ret > 0) {
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if (s->start_periods == 1 && s->stop_periods == 0 &&
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s->start_found_periods < 0) {
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if (s->timestamp_mode == TS_WRITE)
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in->pts = s->next_pts;
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s->next_pts += in->nb_samples;
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return ff_filter_frame(outlink, in);
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}
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if (s->start_periods == 0 && s->stop_periods == 0)
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return ff_filter_frame(outlink, in);
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return filter_frame(outlink, in);
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}
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FF_FILTER_FORWARD_STATUS(inlink, outlink);
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FF_FILTER_FORWARD_WANTED(outlink, inlink);
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return FFERROR_NOT_READY;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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SilenceRemoveContext *s = ctx->priv;
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av_frame_free(&s->start_window);
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av_frame_free(&s->stop_window);
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|
av_frame_free(&s->start_queuef);
|
|
av_frame_free(&s->stop_queuef);
|
|
|
|
av_freep(&s->start_cache);
|
|
av_freep(&s->stop_cache);
|
|
av_freep(&s->start_front);
|
|
av_freep(&s->start_back);
|
|
av_freep(&s->stop_front);
|
|
av_freep(&s->stop_back);
|
|
}
|
|
|
|
static const AVFilterPad silenceremove_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.config_props = config_input,
|
|
},
|
|
};
|
|
|
|
static const AVFilterPad silenceremove_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.config_props = config_output,
|
|
},
|
|
};
|
|
|
|
const AVFilter ff_af_silenceremove = {
|
|
.name = "silenceremove",
|
|
.description = NULL_IF_CONFIG_SMALL("Remove silence."),
|
|
.priv_size = sizeof(SilenceRemoveContext),
|
|
.priv_class = &silenceremove_class,
|
|
.init = init,
|
|
.activate = activate,
|
|
.uninit = uninit,
|
|
FILTER_INPUTS(silenceremove_inputs),
|
|
FILTER_OUTPUTS(silenceremove_outputs),
|
|
FILTER_SAMPLEFMTS(AV_SAMPLE_FMT_FLT,
|
|
AV_SAMPLE_FMT_DBL),
|
|
.process_command = ff_filter_process_command,
|
|
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
|
|
};
|