mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-25 19:01:51 +02:00
517 lines
16 KiB
C
517 lines
16 KiB
C
/*
|
|
* 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/opt.h"
|
|
#include "libavutil/timestamp.h"
|
|
#include "audio.h"
|
|
#include "formats.h"
|
|
#include "avfilter.h"
|
|
#include "internal.h"
|
|
|
|
enum SilenceMode {
|
|
SILENCE_TRIM,
|
|
SILENCE_TRIM_FLUSH,
|
|
SILENCE_COPY,
|
|
SILENCE_COPY_FLUSH,
|
|
SILENCE_STOP
|
|
};
|
|
|
|
typedef struct SilenceRemoveContext {
|
|
const AVClass *class;
|
|
|
|
enum SilenceMode mode;
|
|
|
|
int start_periods;
|
|
int64_t start_duration;
|
|
double start_threshold;
|
|
|
|
int stop_periods;
|
|
int64_t stop_duration;
|
|
double stop_threshold;
|
|
|
|
double *start_holdoff;
|
|
size_t start_holdoff_offset;
|
|
size_t start_holdoff_end;
|
|
int start_found_periods;
|
|
|
|
double *stop_holdoff;
|
|
size_t stop_holdoff_offset;
|
|
size_t stop_holdoff_end;
|
|
int stop_found_periods;
|
|
|
|
double window_ratio;
|
|
double *window;
|
|
double *window_current;
|
|
double *window_end;
|
|
int window_size;
|
|
double sum;
|
|
|
|
int leave_silence;
|
|
int restart;
|
|
int64_t next_pts;
|
|
|
|
int detection;
|
|
void (*update)(struct SilenceRemoveContext *s, double sample);
|
|
double(*compute)(struct SilenceRemoveContext *s, double sample);
|
|
} SilenceRemoveContext;
|
|
|
|
#define OFFSET(x) offsetof(SilenceRemoveContext, x)
|
|
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
|
|
static const AVOption silenceremove_options[] = {
|
|
{ "start_periods", NULL, OFFSET(start_periods), AV_OPT_TYPE_INT, {.i64=0}, 0, 9000, FLAGS },
|
|
{ "start_duration", NULL, OFFSET(start_duration), AV_OPT_TYPE_DURATION, {.i64=0}, 0, 9000, FLAGS },
|
|
{ "start_threshold", NULL, OFFSET(start_threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, DBL_MAX, FLAGS },
|
|
{ "stop_periods", NULL, OFFSET(stop_periods), AV_OPT_TYPE_INT, {.i64=0}, -9000, 9000, FLAGS },
|
|
{ "stop_duration", NULL, OFFSET(stop_duration), AV_OPT_TYPE_DURATION, {.i64=0}, 0, 9000, FLAGS },
|
|
{ "stop_threshold", NULL, OFFSET(stop_threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, DBL_MAX, FLAGS },
|
|
{ "leave_silence", NULL, OFFSET(leave_silence), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
|
|
{ "detection", NULL, OFFSET(detection), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS, "detection" },
|
|
{ "peak", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "detection" },
|
|
{ "rms", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "detection" },
|
|
{ "window", NULL, OFFSET(window_ratio), AV_OPT_TYPE_DOUBLE, {.dbl=0.02}, 0, 10, FLAGS },
|
|
{ NULL }
|
|
};
|
|
|
|
AVFILTER_DEFINE_CLASS(silenceremove);
|
|
|
|
static double compute_peak(SilenceRemoveContext *s, double sample)
|
|
{
|
|
double new_sum;
|
|
|
|
new_sum = s->sum;
|
|
new_sum -= *s->window_current;
|
|
new_sum += fabs(sample);
|
|
|
|
return new_sum / s->window_size;
|
|
}
|
|
|
|
static void update_peak(SilenceRemoveContext *s, double sample)
|
|
{
|
|
s->sum -= *s->window_current;
|
|
*s->window_current = fabs(sample);
|
|
s->sum += *s->window_current;
|
|
|
|
s->window_current++;
|
|
if (s->window_current >= s->window_end)
|
|
s->window_current = s->window;
|
|
}
|
|
|
|
static double compute_rms(SilenceRemoveContext *s, double sample)
|
|
{
|
|
double new_sum;
|
|
|
|
new_sum = s->sum;
|
|
new_sum -= *s->window_current;
|
|
new_sum += sample * sample;
|
|
|
|
return sqrt(new_sum / s->window_size);
|
|
}
|
|
|
|
static void update_rms(SilenceRemoveContext *s, double sample)
|
|
{
|
|
s->sum -= *s->window_current;
|
|
*s->window_current = sample * sample;
|
|
s->sum += *s->window_current;
|
|
|
|
s->window_current++;
|
|
if (s->window_current >= s->window_end)
|
|
s->window_current = s->window;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
switch (s->detection) {
|
|
case 0:
|
|
s->update = update_peak;
|
|
s->compute = compute_peak;
|
|
break;
|
|
case 1:
|
|
s->update = update_rms;
|
|
s->compute = compute_rms;
|
|
break;
|
|
};
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void clear_window(SilenceRemoveContext *s)
|
|
{
|
|
memset(s->window, 0, s->window_size * sizeof(*s->window));
|
|
|
|
s->window_current = s->window;
|
|
s->window_end = s->window + s->window_size;
|
|
s->sum = 0;
|
|
}
|
|
|
|
static int config_input(AVFilterLink *inlink)
|
|
{
|
|
AVFilterContext *ctx = inlink->dst;
|
|
SilenceRemoveContext *s = ctx->priv;
|
|
|
|
s->window_size = FFMAX((inlink->sample_rate * s->window_ratio), 1) * inlink->channels;
|
|
s->window = av_malloc_array(s->window_size, sizeof(*s->window));
|
|
if (!s->window)
|
|
return AVERROR(ENOMEM);
|
|
|
|
clear_window(s);
|
|
|
|
s->start_duration = av_rescale(s->start_duration, inlink->sample_rate,
|
|
AV_TIME_BASE);
|
|
s->stop_duration = av_rescale(s->stop_duration, inlink->sample_rate,
|
|
AV_TIME_BASE);
|
|
|
|
s->start_holdoff = av_malloc_array(FFMAX(s->start_duration, 1),
|
|
sizeof(*s->start_holdoff) *
|
|
inlink->channels);
|
|
if (!s->start_holdoff)
|
|
return AVERROR(ENOMEM);
|
|
|
|
s->start_holdoff_offset = 0;
|
|
s->start_holdoff_end = 0;
|
|
s->start_found_periods = 0;
|
|
|
|
s->stop_holdoff = av_malloc_array(FFMAX(s->stop_duration, 1),
|
|
sizeof(*s->stop_holdoff) *
|
|
inlink->channels);
|
|
if (!s->stop_holdoff)
|
|
return AVERROR(ENOMEM);
|
|
|
|
s->stop_holdoff_offset = 0;
|
|
s->stop_holdoff_end = 0;
|
|
s->stop_found_periods = 0;
|
|
|
|
if (s->start_periods)
|
|
s->mode = SILENCE_TRIM;
|
|
else
|
|
s->mode = SILENCE_COPY;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void flush(AVFrame *out, AVFilterLink *outlink,
|
|
int *nb_samples_written, int *ret)
|
|
{
|
|
if (*nb_samples_written) {
|
|
out->nb_samples = *nb_samples_written / outlink->channels;
|
|
*ret = ff_filter_frame(outlink, out);
|
|
*nb_samples_written = 0;
|
|
} else {
|
|
av_frame_free(&out);
|
|
}
|
|
}
|
|
|
|
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
|
|
{
|
|
AVFilterContext *ctx = inlink->dst;
|
|
AVFilterLink *outlink = ctx->outputs[0];
|
|
SilenceRemoveContext *s = ctx->priv;
|
|
int i, j, threshold, ret = 0;
|
|
int nbs, nb_samples_read, nb_samples_written;
|
|
double *obuf, *ibuf = (double *)in->data[0];
|
|
AVFrame *out;
|
|
|
|
nb_samples_read = nb_samples_written = 0;
|
|
|
|
switch (s->mode) {
|
|
case SILENCE_TRIM:
|
|
silence_trim:
|
|
nbs = in->nb_samples - nb_samples_read / inlink->channels;
|
|
if (!nbs)
|
|
break;
|
|
|
|
for (i = 0; i < nbs; i++) {
|
|
threshold = 0;
|
|
for (j = 0; j < inlink->channels; j++) {
|
|
threshold |= s->compute(s, ibuf[j]) > s->start_threshold;
|
|
}
|
|
|
|
if (threshold) {
|
|
for (j = 0; j < inlink->channels; j++) {
|
|
s->update(s, *ibuf);
|
|
s->start_holdoff[s->start_holdoff_end++] = *ibuf++;
|
|
}
|
|
nb_samples_read += inlink->channels;
|
|
|
|
if (s->start_holdoff_end >= s->start_duration * inlink->channels) {
|
|
if (++s->start_found_periods >= s->start_periods) {
|
|
s->mode = SILENCE_TRIM_FLUSH;
|
|
goto silence_trim_flush;
|
|
}
|
|
|
|
s->start_holdoff_offset = 0;
|
|
s->start_holdoff_end = 0;
|
|
}
|
|
} else {
|
|
s->start_holdoff_end = 0;
|
|
|
|
for (j = 0; j < inlink->channels; j++)
|
|
s->update(s, ibuf[j]);
|
|
|
|
ibuf += inlink->channels;
|
|
nb_samples_read += inlink->channels;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case SILENCE_TRIM_FLUSH:
|
|
silence_trim_flush:
|
|
nbs = s->start_holdoff_end - s->start_holdoff_offset;
|
|
nbs -= nbs % inlink->channels;
|
|
if (!nbs)
|
|
break;
|
|
|
|
out = ff_get_audio_buffer(inlink, nbs / inlink->channels);
|
|
if (!out) {
|
|
av_frame_free(&in);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
memcpy(out->data[0], &s->start_holdoff[s->start_holdoff_offset],
|
|
nbs * sizeof(double));
|
|
s->start_holdoff_offset += nbs;
|
|
|
|
ret = ff_filter_frame(outlink, out);
|
|
|
|
if (s->start_holdoff_offset == s->start_holdoff_end) {
|
|
s->start_holdoff_offset = 0;
|
|
s->start_holdoff_end = 0;
|
|
s->mode = SILENCE_COPY;
|
|
goto silence_copy;
|
|
}
|
|
break;
|
|
|
|
case SILENCE_COPY:
|
|
silence_copy:
|
|
nbs = in->nb_samples - nb_samples_read / inlink->channels;
|
|
if (!nbs)
|
|
break;
|
|
|
|
out = ff_get_audio_buffer(inlink, nbs);
|
|
if (!out) {
|
|
av_frame_free(&in);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
obuf = (double *)out->data[0];
|
|
|
|
if (s->stop_periods) {
|
|
for (i = 0; i < nbs; i++) {
|
|
threshold = 1;
|
|
for (j = 0; j < inlink->channels; j++)
|
|
threshold &= s->compute(s, ibuf[j]) > s->stop_threshold;
|
|
|
|
if (threshold && s->stop_holdoff_end && !s->leave_silence) {
|
|
s->mode = SILENCE_COPY_FLUSH;
|
|
flush(out, outlink, &nb_samples_written, &ret);
|
|
goto silence_copy_flush;
|
|
} else if (threshold) {
|
|
for (j = 0; j < inlink->channels; j++) {
|
|
s->update(s, *ibuf);
|
|
*obuf++ = *ibuf++;
|
|
}
|
|
nb_samples_read += inlink->channels;
|
|
nb_samples_written += inlink->channels;
|
|
} else if (!threshold) {
|
|
for (j = 0; j < inlink->channels; j++) {
|
|
s->update(s, *ibuf);
|
|
if (s->leave_silence) {
|
|
*obuf++ = *ibuf;
|
|
nb_samples_written++;
|
|
}
|
|
|
|
s->stop_holdoff[s->stop_holdoff_end++] = *ibuf++;
|
|
}
|
|
nb_samples_read += inlink->channels;
|
|
|
|
if (s->stop_holdoff_end >= s->stop_duration * inlink->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(out, outlink, &nb_samples_written, &ret);
|
|
goto silence_stop;
|
|
} else {
|
|
s->stop_found_periods = 0;
|
|
s->start_found_periods = 0;
|
|
s->start_holdoff_offset = 0;
|
|
s->start_holdoff_end = 0;
|
|
clear_window(s);
|
|
s->mode = SILENCE_TRIM;
|
|
flush(out, outlink, &nb_samples_written, &ret);
|
|
goto silence_trim;
|
|
}
|
|
}
|
|
s->mode = SILENCE_COPY_FLUSH;
|
|
flush(out, outlink, &nb_samples_written, &ret);
|
|
goto silence_copy_flush;
|
|
}
|
|
}
|
|
}
|
|
flush(out, outlink, &nb_samples_written, &ret);
|
|
} else {
|
|
memcpy(obuf, ibuf, sizeof(double) * nbs * inlink->channels);
|
|
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 % inlink->channels;
|
|
if (!nbs)
|
|
break;
|
|
|
|
out = ff_get_audio_buffer(inlink, nbs / inlink->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;
|
|
|
|
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->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));
|
|
ret = ff_filter_frame(ctx->inputs[0], 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->stop_holdoff);
|
|
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,
|
|
};
|