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FFmpeg/libavfilter/af_silenceremove.c
Anton Khirnov 6d75d44d90 lavfi: drop internal.h 
All that remains in it are things that belong in avfilter_internal.h.

Move them there and remove internal.h
2024-08-19 21:48:04 +02:00

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/*
* Copyright (c) 2001 Heikki Leinonen
* Copyright (c) 2001 Chris Bagwell
* Copyright (c) 2003 Donnie Smith
* Copyright (c) 2014 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <float.h> /* DBL_MAX */
#include "libavutil/avassert.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "audio.h"
#include "filters.h"
#include "avfilter.h"
enum SilenceDetect {
D_AVG,
D_RMS,
D_PEAK,
D_MEDIAN,
D_PTP,
D_DEV,
D_NB
};
enum TimestampMode {
TS_WRITE,
TS_COPY,
TS_NB
};
enum ThresholdMode {
T_ANY,
T_ALL,
};
typedef struct SilenceRemoveContext {
const AVClass *class;
int start_mode;
int start_periods;
int64_t start_duration;
int64_t start_duration_opt;
double start_threshold;
int64_t start_silence;
int64_t start_silence_opt;
int stop_mode;
int stop_periods;
int64_t stop_duration;
int64_t stop_duration_opt;
double stop_threshold;
int64_t stop_silence;
int64_t stop_silence_opt;
int64_t window_duration_opt;
int timestamp_mode;
int start_found_periods;
int stop_found_periods;
int start_sample_count;
int start_silence_count;
int stop_sample_count;
int stop_silence_count;
AVFrame *start_window;
AVFrame *stop_window;
int *start_front;
int *start_back;
int *stop_front;
int *stop_back;
int64_t window_duration;
int cache_size;
int start_window_pos;
int start_window_size;
int stop_window_pos;
int stop_window_size;
double *start_cache;
double *stop_cache;
AVFrame *start_queuef;
int start_queue_pos;
int start_queue_size;
AVFrame *stop_queuef;
int stop_queue_pos;
int stop_queue_size;
int restart;
int found_nonsilence;
int64_t next_pts;
int detection;
float (*compute_flt)(float *c, float s, float ws, int size, int *front, int *back);
double (*compute_dbl)(double *c, double s, double ws, int size, int *front, int *back);
} SilenceRemoveContext;
#define OFFSET(x) offsetof(SilenceRemoveContext, x)
#define AF AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
#define AFR AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption silenceremove_options[] = {
{ "start_periods", "set periods of silence parts to skip from start", OFFSET(start_periods), AV_OPT_TYPE_INT, {.i64=0}, 0, 9000, AF },
{ "start_duration", "set start duration of non-silence part", OFFSET(start_duration_opt), AV_OPT_TYPE_DURATION, {.i64=0}, 0, INT32_MAX, AF },
{ "start_threshold", "set threshold for start silence detection", OFFSET(start_threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, DBL_MAX, AFR },
{ "start_silence", "set start duration of silence part to keep", OFFSET(start_silence_opt), AV_OPT_TYPE_DURATION, {.i64=0}, 0, INT32_MAX, AF },
{ "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" },
{ "any", 0, 0, AV_OPT_TYPE_CONST, {.i64=T_ANY}, 0, 0, AFR, .unit = "mode" },
{ "all", 0, 0, AV_OPT_TYPE_CONST, {.i64=T_ALL}, 0, 0, AFR, .unit = "mode" },
{ "stop_periods", "set periods of silence parts to skip from end", OFFSET(stop_periods), AV_OPT_TYPE_INT, {.i64=0}, -9000, 9000, AF },
{ "stop_duration", "set stop duration of silence part", OFFSET(stop_duration_opt), AV_OPT_TYPE_DURATION, {.i64=0}, 0, INT32_MAX, AF },
{ "stop_threshold", "set threshold for stop silence detection", OFFSET(stop_threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, DBL_MAX, AFR },
{ "stop_silence", "set stop duration of silence part to keep", OFFSET(stop_silence_opt), AV_OPT_TYPE_DURATION, {.i64=0}, 0, INT32_MAX, AF },
{ "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" },
{ "detection", "set how silence is detected", OFFSET(detection), AV_OPT_TYPE_INT, {.i64=D_RMS}, 0, D_NB-1, AF, .unit = "detection" },
{ "avg", "use mean absolute values of samples", 0, AV_OPT_TYPE_CONST, {.i64=D_AVG}, 0, 0, AF, .unit = "detection" },
{ "rms", "use root mean squared values of samples", 0, AV_OPT_TYPE_CONST, {.i64=D_RMS}, 0, 0, AF, .unit = "detection" },
{ "peak", "use max absolute values of samples", 0, AV_OPT_TYPE_CONST, {.i64=D_PEAK},0, 0, AF, .unit = "detection" },
{ "median", "use median of absolute values of samples", 0, AV_OPT_TYPE_CONST, {.i64=D_MEDIAN},0, 0, AF, .unit = "detection" },
{ "ptp", "use absolute of max peak to min peak difference", 0, AV_OPT_TYPE_CONST, {.i64=D_PTP}, 0, 0, AF, .unit = "detection" },
{ "dev", "use standard deviation from values of samples", 0, AV_OPT_TYPE_CONST, {.i64=D_DEV}, 0, 0, AF, .unit = "detection" },
{ "window", "set duration of window for silence detection", OFFSET(window_duration_opt), AV_OPT_TYPE_DURATION, {.i64=20000}, 0, 100000000, AF },
{ "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" },
{ "write", "full timestamps rewrite, keep only the start time", 0, AV_OPT_TYPE_CONST, {.i64=TS_WRITE}, 0, 0, AF, .unit = "timestamp" },
{ "copy", "non-dropped frames are left with same timestamp", 0, AV_OPT_TYPE_CONST, {.i64=TS_COPY}, 0, 0, AF, .unit = "timestamp" },
{ NULL }
};
AVFILTER_DEFINE_CLASS(silenceremove);
#define DEPTH 32
#include "silenceremove_template.c"
#undef DEPTH
#define DEPTH 64
#include "silenceremove_template.c"
static av_cold int init(AVFilterContext *ctx)
{
SilenceRemoveContext *s = ctx->priv;
if (s->stop_periods < 0) {
s->stop_periods = -s->stop_periods;
s->restart = 1;
}
return 0;
}
static void clear_windows(SilenceRemoveContext *s)
{
av_samples_set_silence(s->start_window->extended_data, 0,
s->start_window->nb_samples,
s->start_window->ch_layout.nb_channels,
s->start_window->format);
av_samples_set_silence(s->stop_window->extended_data, 0,
s->stop_window->nb_samples,
s->stop_window->ch_layout.nb_channels,
s->stop_window->format);
s->start_window_pos = 0;
s->start_window_size = 0;
s->stop_window_pos = 0;
s->stop_window_size = 0;
s->start_queue_pos = 0;
s->start_queue_size = 0;
s->stop_queue_pos = 0;
s->stop_queue_size = 0;
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
SilenceRemoveContext *s = ctx->priv;
s->next_pts = AV_NOPTS_VALUE;
s->window_duration = av_rescale(s->window_duration_opt, inlink->sample_rate,
AV_TIME_BASE);
s->window_duration = FFMAX(1, s->window_duration);
s->start_duration = av_rescale(s->start_duration_opt, inlink->sample_rate,
AV_TIME_BASE);
s->start_silence = av_rescale(s->start_silence_opt, inlink->sample_rate,
AV_TIME_BASE);
s->stop_duration = av_rescale(s->stop_duration_opt, inlink->sample_rate,
AV_TIME_BASE);
s->stop_silence = av_rescale(s->stop_silence_opt, inlink->sample_rate,
AV_TIME_BASE);
s->start_found_periods = 0;
s->stop_found_periods = 0;
return 0;
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
SilenceRemoveContext *s = ctx->priv;
switch (s->detection) {
case D_AVG:
case D_RMS:
s->cache_size = 1;
break;
case D_DEV:
s->cache_size = 2;
break;
case D_MEDIAN:
case D_PEAK:
case D_PTP:
s->cache_size = s->window_duration;
break;
}
s->start_window = ff_get_audio_buffer(outlink, s->window_duration);
s->stop_window = ff_get_audio_buffer(outlink, s->window_duration);
s->start_cache = av_calloc(outlink->ch_layout.nb_channels, s->cache_size * sizeof(*s->start_cache));
s->stop_cache = av_calloc(outlink->ch_layout.nb_channels, s->cache_size * sizeof(*s->stop_cache));
if (!s->start_window || !s->stop_window || !s->start_cache || !s->stop_cache)
return AVERROR(ENOMEM);
s->start_queuef = ff_get_audio_buffer(outlink, s->start_silence + 1);
s->stop_queuef = ff_get_audio_buffer(outlink, s->stop_silence + 1);
if (!s->start_queuef || !s->stop_queuef)
return AVERROR(ENOMEM);
s->start_front = av_calloc(outlink->ch_layout.nb_channels, sizeof(*s->start_front));
s->start_back = av_calloc(outlink->ch_layout.nb_channels, sizeof(*s->start_back));
s->stop_front = av_calloc(outlink->ch_layout.nb_channels, sizeof(*s->stop_front));
s->stop_back = av_calloc(outlink->ch_layout.nb_channels, sizeof(*s->stop_back));
if (!s->start_front || !s->start_back || !s->stop_front || !s->stop_back)
return AVERROR(ENOMEM);
clear_windows(s);
switch (s->detection) {
case D_AVG:
s->compute_flt = compute_avg_flt;
s->compute_dbl = compute_avg_dbl;
break;
case D_DEV:
s->compute_flt = compute_dev_flt;
s->compute_dbl = compute_dev_dbl;
break;
case D_PTP:
s->compute_flt = compute_ptp_flt;
s->compute_dbl = compute_ptp_dbl;
break;
case D_MEDIAN:
s->compute_flt = compute_median_flt;
s->compute_dbl = compute_median_dbl;
break;
case D_PEAK:
s->compute_flt = compute_peak_flt;
s->compute_dbl = compute_peak_dbl;
break;
case D_RMS:
s->compute_flt = compute_rms_flt;
s->compute_dbl = compute_rms_dbl;
break;
}
return 0;
}
static int filter_frame(AVFilterLink *outlink, AVFrame *in)
{
const int nb_channels = outlink->ch_layout.nb_channels;
AVFilterContext *ctx = outlink->src;
SilenceRemoveContext *s = ctx->priv;
int max_out_nb_samples;
int out_nb_samples = 0;
int in_nb_samples;
const double *srcd;
const float *srcf;
AVFrame *out;
double *dstd;
float *dstf;
if (s->next_pts == AV_NOPTS_VALUE)
s->next_pts = in->pts;
in_nb_samples = in->nb_samples;
max_out_nb_samples = in->nb_samples +
s->start_silence +
s->stop_silence;
if (max_out_nb_samples <= 0) {
av_frame_free(&in);
ff_filter_set_ready(ctx, 100);
return 0;
}
out = ff_get_audio_buffer(outlink, max_out_nb_samples);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
if (s->timestamp_mode == TS_WRITE)
out->pts = s->next_pts;
else
out->pts = in->pts;
switch (outlink->format) {
case AV_SAMPLE_FMT_FLT:
srcf = (const float *)in->data[0];
dstf = (float *)out->data[0];
if (s->start_periods > 0 && s->stop_periods > 0) {
const float *src = srcf;
if (s->start_found_periods >= 0) {
for (int n = 0; n < in_nb_samples; n++) {
filter_start_flt(ctx, src + n * nb_channels,
dstf, &out_nb_samples,
nb_channels);
}
in_nb_samples = out_nb_samples;
out_nb_samples = 0;
src = dstf;
}
for (int n = 0; n < in_nb_samples; n++) {
filter_stop_flt(ctx, src + n * nb_channels,
dstf, &out_nb_samples,
nb_channels);
}
} else if (s->start_periods > 0) {
for (int n = 0; n < in_nb_samples; n++) {
filter_start_flt(ctx, srcf + n * nb_channels,
dstf, &out_nb_samples,
nb_channels);
}
} else if (s->stop_periods > 0) {
for (int n = 0; n < in_nb_samples; n++) {
filter_stop_flt(ctx, srcf + n * nb_channels,
dstf, &out_nb_samples,
nb_channels);
}
}
break;
case AV_SAMPLE_FMT_DBL:
srcd = (const double *)in->data[0];
dstd = (double *)out->data[0];
if (s->start_periods > 0 && s->stop_periods > 0) {
const double *src = srcd;
if (s->start_found_periods >= 0) {
for (int n = 0; n < in_nb_samples; n++) {
filter_start_dbl(ctx, src + n * nb_channels,
dstd, &out_nb_samples,
nb_channels);
}
in_nb_samples = out_nb_samples;
out_nb_samples = 0;
src = dstd;
}
for (int n = 0; n < in_nb_samples; n++) {
filter_stop_dbl(ctx, src + n * nb_channels,
dstd, &out_nb_samples,
nb_channels);
}
} else if (s->start_periods > 0) {
for (int n = 0; n < in_nb_samples; n++) {
filter_start_dbl(ctx, srcd + n * nb_channels,
dstd, &out_nb_samples,
nb_channels);
}
} else if (s->stop_periods > 0) {
for (int n = 0; n < in_nb_samples; n++) {
filter_stop_dbl(ctx, srcd + n * nb_channels,
dstd, &out_nb_samples,
nb_channels);
}
}
break;
}
av_frame_free(&in);
if (out_nb_samples > 0) {
s->next_pts += out_nb_samples;
out->nb_samples = out_nb_samples;
return ff_filter_frame(outlink, out);
}
av_frame_free(&out);
ff_filter_set_ready(ctx, 100);
return 0;
}
static int activate(AVFilterContext *ctx)
{
AVFilterLink *outlink = ctx->outputs[0];
AVFilterLink *inlink = ctx->inputs[0];
SilenceRemoveContext *s = ctx->priv;
AVFrame *in;
int ret;
FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
ret = ff_inlink_consume_frame(inlink, &in);
if (ret < 0)
return ret;
if (ret > 0) {
if (s->start_periods == 1 && s->stop_periods == 0 &&
s->start_found_periods < 0) {
if (s->timestamp_mode == TS_WRITE)
in->pts = s->next_pts;
s->next_pts += in->nb_samples;
return ff_filter_frame(outlink, in);
}
if (s->start_periods == 0 && s->stop_periods == 0)
return ff_filter_frame(outlink, in);
return filter_frame(outlink, in);
}
FF_FILTER_FORWARD_STATUS(inlink, outlink);
FF_FILTER_FORWARD_WANTED(outlink, inlink);
return FFERROR_NOT_READY;
}
static av_cold void uninit(AVFilterContext *ctx)
{
SilenceRemoveContext *s = ctx->priv;
av_frame_free(&s->start_window);
av_frame_free(&s->stop_window);
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,
};
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