| /* |
| * 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" |
| #include "internal.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, |
| }; |