| /* |
| * Copyright (C) 2001-2010 Krzysztof Foltman, Markus Schmidt, Thor Harald Johansen and others |
| * Copyright (c) 2015 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 |
| */ |
| |
| /** |
| * @file |
| * Audio (Sidechain) Compressor filter |
| */ |
| |
| #include "libavutil/audio_fifo.h" |
| #include "libavutil/avassert.h" |
| #include "libavutil/channel_layout.h" |
| #include "libavutil/common.h" |
| #include "libavutil/opt.h" |
| |
| #include "audio.h" |
| #include "avfilter.h" |
| #include "filters.h" |
| #include "formats.h" |
| #include "hermite.h" |
| #include "internal.h" |
| |
| typedef struct SidechainCompressContext { |
| const AVClass *class; |
| |
| double level_in; |
| double level_sc; |
| double attack, attack_coeff; |
| double release, release_coeff; |
| double lin_slope; |
| double ratio; |
| double threshold; |
| double makeup; |
| double mix; |
| double thres; |
| double knee; |
| double knee_start; |
| double knee_stop; |
| double lin_knee_start; |
| double lin_knee_stop; |
| double adj_knee_start; |
| double adj_knee_stop; |
| double compressed_knee_start; |
| double compressed_knee_stop; |
| int link; |
| int detection; |
| int mode; |
| |
| AVAudioFifo *fifo[2]; |
| int64_t pts; |
| } SidechainCompressContext; |
| |
| #define OFFSET(x) offsetof(SidechainCompressContext, x) |
| #define A AV_OPT_FLAG_AUDIO_PARAM |
| #define F AV_OPT_FLAG_FILTERING_PARAM |
| #define R AV_OPT_FLAG_RUNTIME_PARAM |
| |
| static const AVOption options[] = { |
| { "level_in", "set input gain", OFFSET(level_in), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A|F|R }, |
| { "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, A|F|R, "mode" }, |
| { "downward",0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A|F|R, "mode" }, |
| { "upward", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A|F|R, "mode" }, |
| { "threshold", "set threshold", OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0.125}, 0.000976563, 1, A|F|R }, |
| { "ratio", "set ratio", OFFSET(ratio), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 1, 20, A|F|R }, |
| { "attack", "set attack", OFFSET(attack), AV_OPT_TYPE_DOUBLE, {.dbl=20}, 0.01, 2000, A|F|R }, |
| { "release", "set release", OFFSET(release), AV_OPT_TYPE_DOUBLE, {.dbl=250}, 0.01, 9000, A|F|R }, |
| { "makeup", "set make up gain", OFFSET(makeup), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 1, 64, A|F|R }, |
| { "knee", "set knee", OFFSET(knee), AV_OPT_TYPE_DOUBLE, {.dbl=2.82843}, 1, 8, A|F|R }, |
| { "link", "set link type", OFFSET(link), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, A|F|R, "link" }, |
| { "average", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A|F|R, "link" }, |
| { "maximum", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A|F|R, "link" }, |
| { "detection", "set detection", OFFSET(detection), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, A|F|R, "detection" }, |
| { "peak", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A|F|R, "detection" }, |
| { "rms", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A|F|R, "detection" }, |
| { "level_sc", "set sidechain gain", OFFSET(level_sc), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A|F|R }, |
| { "mix", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, A|F|R }, |
| { NULL } |
| }; |
| |
| #define sidechaincompress_options options |
| AVFILTER_DEFINE_CLASS(sidechaincompress); |
| |
| // A fake infinity value (because real infinity may break some hosts) |
| #define FAKE_INFINITY (65536.0 * 65536.0) |
| |
| // Check for infinity (with appropriate-ish tolerance) |
| #define IS_FAKE_INFINITY(value) (fabs(value-FAKE_INFINITY) < 1.0) |
| |
| static double output_gain(double lin_slope, double ratio, double thres, |
| double knee, double knee_start, double knee_stop, |
| double compressed_knee_start, |
| double compressed_knee_stop, |
| int detection, int mode) |
| { |
| double slope = log(lin_slope); |
| double gain = 0.0; |
| double delta = 0.0; |
| |
| if (detection) |
| slope *= 0.5; |
| |
| if (IS_FAKE_INFINITY(ratio)) { |
| gain = thres; |
| delta = 0.0; |
| } else { |
| gain = (slope - thres) / ratio + thres; |
| delta = 1.0 / ratio; |
| } |
| |
| if (mode) { |
| if (knee > 1.0 && slope > knee_start) |
| gain = hermite_interpolation(slope, knee_stop, knee_start, |
| knee_stop, compressed_knee_start, |
| 1.0, delta); |
| } else { |
| if (knee > 1.0 && slope < knee_stop) |
| gain = hermite_interpolation(slope, knee_start, knee_stop, |
| knee_start, compressed_knee_stop, |
| 1.0, delta); |
| } |
| |
| return exp(gain - slope); |
| } |
| |
| static int compressor_config_output(AVFilterLink *outlink) |
| { |
| AVFilterContext *ctx = outlink->src; |
| SidechainCompressContext *s = ctx->priv; |
| |
| s->thres = log(s->threshold); |
| s->lin_knee_start = s->threshold / sqrt(s->knee); |
| s->lin_knee_stop = s->threshold * sqrt(s->knee); |
| s->adj_knee_start = s->lin_knee_start * s->lin_knee_start; |
| s->adj_knee_stop = s->lin_knee_stop * s->lin_knee_stop; |
| s->knee_start = log(s->lin_knee_start); |
| s->knee_stop = log(s->lin_knee_stop); |
| s->compressed_knee_start = (s->knee_start - s->thres) / s->ratio + s->thres; |
| s->compressed_knee_stop = (s->knee_stop - s->thres) / s->ratio + s->thres; |
| |
| s->attack_coeff = FFMIN(1., 1. / (s->attack * outlink->sample_rate / 4000.)); |
| s->release_coeff = FFMIN(1., 1. / (s->release * outlink->sample_rate / 4000.)); |
| |
| return 0; |
| } |
| |
| static void compressor(SidechainCompressContext *s, |
| const double *src, double *dst, const double *scsrc, int nb_samples, |
| double level_in, double level_sc, |
| AVFilterLink *inlink, AVFilterLink *sclink) |
| { |
| const double makeup = s->makeup; |
| const double mix = s->mix; |
| int i, c; |
| |
| for (i = 0; i < nb_samples; i++) { |
| double abs_sample, gain = 1.0; |
| double detector; |
| int detected; |
| |
| abs_sample = fabs(scsrc[0] * level_sc); |
| |
| if (s->link == 1) { |
| for (c = 1; c < sclink->channels; c++) |
| abs_sample = FFMAX(fabs(scsrc[c] * level_sc), abs_sample); |
| } else { |
| for (c = 1; c < sclink->channels; c++) |
| abs_sample += fabs(scsrc[c] * level_sc); |
| |
| abs_sample /= sclink->channels; |
| } |
| |
| if (s->detection) |
| abs_sample *= abs_sample; |
| |
| s->lin_slope += (abs_sample - s->lin_slope) * (abs_sample > s->lin_slope ? s->attack_coeff : s->release_coeff); |
| |
| if (s->mode) { |
| detector = (s->detection ? s->adj_knee_stop : s->lin_knee_stop); |
| detected = s->lin_slope < detector; |
| } else { |
| detector = (s->detection ? s->adj_knee_start : s->lin_knee_start); |
| detected = s->lin_slope > detector; |
| } |
| |
| if (s->lin_slope > 0.0 && detected) |
| gain = output_gain(s->lin_slope, s->ratio, s->thres, s->knee, |
| s->knee_start, s->knee_stop, |
| s->compressed_knee_start, |
| s->compressed_knee_stop, |
| s->detection, s->mode); |
| |
| for (c = 0; c < inlink->channels; c++) |
| dst[c] = src[c] * level_in * (gain * makeup * mix + (1. - mix)); |
| |
| src += inlink->channels; |
| dst += inlink->channels; |
| scsrc += sclink->channels; |
| } |
| } |
| |
| static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, |
| char *res, int res_len, int flags) |
| { |
| int ret; |
| |
| ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags); |
| if (ret < 0) |
| return ret; |
| |
| compressor_config_output(ctx->outputs[0]); |
| |
| return 0; |
| } |
| |
| #if CONFIG_SIDECHAINCOMPRESS_FILTER |
| static int activate(AVFilterContext *ctx) |
| { |
| SidechainCompressContext *s = ctx->priv; |
| AVFrame *out = NULL, *in[2] = { NULL }; |
| int ret, i, nb_samples; |
| double *dst; |
| |
| FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[0], ctx); |
| if ((ret = ff_inlink_consume_frame(ctx->inputs[0], &in[0])) > 0) { |
| av_audio_fifo_write(s->fifo[0], (void **)in[0]->extended_data, |
| in[0]->nb_samples); |
| av_frame_free(&in[0]); |
| } |
| if (ret < 0) |
| return ret; |
| if ((ret = ff_inlink_consume_frame(ctx->inputs[1], &in[1])) > 0) { |
| av_audio_fifo_write(s->fifo[1], (void **)in[1]->extended_data, |
| in[1]->nb_samples); |
| av_frame_free(&in[1]); |
| } |
| if (ret < 0) |
| return ret; |
| |
| nb_samples = FFMIN(av_audio_fifo_size(s->fifo[0]), av_audio_fifo_size(s->fifo[1])); |
| if (nb_samples) { |
| out = ff_get_audio_buffer(ctx->outputs[0], nb_samples); |
| if (!out) |
| return AVERROR(ENOMEM); |
| for (i = 0; i < 2; i++) { |
| in[i] = ff_get_audio_buffer(ctx->inputs[i], nb_samples); |
| if (!in[i]) { |
| av_frame_free(&in[0]); |
| av_frame_free(&in[1]); |
| av_frame_free(&out); |
| return AVERROR(ENOMEM); |
| } |
| av_audio_fifo_read(s->fifo[i], (void **)in[i]->data, nb_samples); |
| } |
| |
| dst = (double *)out->data[0]; |
| out->pts = s->pts; |
| s->pts += av_rescale_q(nb_samples, (AVRational){1, ctx->outputs[0]->sample_rate}, ctx->outputs[0]->time_base); |
| |
| compressor(s, (double *)in[0]->data[0], dst, |
| (double *)in[1]->data[0], nb_samples, |
| s->level_in, s->level_sc, |
| ctx->inputs[0], ctx->inputs[1]); |
| |
| av_frame_free(&in[0]); |
| av_frame_free(&in[1]); |
| |
| ret = ff_filter_frame(ctx->outputs[0], out); |
| if (ret < 0) |
| return ret; |
| } |
| FF_FILTER_FORWARD_STATUS(ctx->inputs[0], ctx->outputs[0]); |
| FF_FILTER_FORWARD_STATUS(ctx->inputs[1], ctx->outputs[0]); |
| if (ff_outlink_frame_wanted(ctx->outputs[0])) { |
| if (!av_audio_fifo_size(s->fifo[0])) |
| ff_inlink_request_frame(ctx->inputs[0]); |
| if (!av_audio_fifo_size(s->fifo[1])) |
| ff_inlink_request_frame(ctx->inputs[1]); |
| } |
| return 0; |
| } |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| AVFilterFormats *formats; |
| AVFilterChannelLayouts *layouts = NULL; |
| static const enum AVSampleFormat sample_fmts[] = { |
| AV_SAMPLE_FMT_DBL, |
| AV_SAMPLE_FMT_NONE |
| }; |
| int ret, i; |
| |
| if (!ctx->inputs[0]->incfg.channel_layouts || |
| !ctx->inputs[0]->incfg.channel_layouts->nb_channel_layouts) { |
| av_log(ctx, AV_LOG_WARNING, |
| "No channel layout for input 1\n"); |
| return AVERROR(EAGAIN); |
| } |
| |
| if ((ret = ff_add_channel_layout(&layouts, ctx->inputs[0]->incfg.channel_layouts->channel_layouts[0])) < 0 || |
| (ret = ff_channel_layouts_ref(layouts, &ctx->outputs[0]->incfg.channel_layouts)) < 0) |
| return ret; |
| |
| for (i = 0; i < 2; i++) { |
| layouts = ff_all_channel_counts(); |
| if ((ret = ff_channel_layouts_ref(layouts, &ctx->inputs[i]->outcfg.channel_layouts)) < 0) |
| return ret; |
| } |
| |
| formats = ff_make_format_list(sample_fmts); |
| if ((ret = ff_set_common_formats(ctx, formats)) < 0) |
| return ret; |
| |
| formats = ff_all_samplerates(); |
| return ff_set_common_samplerates(ctx, formats); |
| } |
| |
| static int config_output(AVFilterLink *outlink) |
| { |
| AVFilterContext *ctx = outlink->src; |
| SidechainCompressContext *s = ctx->priv; |
| |
| if (ctx->inputs[0]->sample_rate != ctx->inputs[1]->sample_rate) { |
| av_log(ctx, AV_LOG_ERROR, |
| "Inputs must have the same sample rate " |
| "%d for in0 vs %d for in1\n", |
| ctx->inputs[0]->sample_rate, ctx->inputs[1]->sample_rate); |
| return AVERROR(EINVAL); |
| } |
| |
| outlink->sample_rate = ctx->inputs[0]->sample_rate; |
| outlink->time_base = ctx->inputs[0]->time_base; |
| outlink->channel_layout = ctx->inputs[0]->channel_layout; |
| outlink->channels = ctx->inputs[0]->channels; |
| |
| s->fifo[0] = av_audio_fifo_alloc(ctx->inputs[0]->format, ctx->inputs[0]->channels, 1024); |
| s->fifo[1] = av_audio_fifo_alloc(ctx->inputs[1]->format, ctx->inputs[1]->channels, 1024); |
| if (!s->fifo[0] || !s->fifo[1]) |
| return AVERROR(ENOMEM); |
| |
| compressor_config_output(outlink); |
| |
| return 0; |
| } |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| SidechainCompressContext *s = ctx->priv; |
| |
| av_audio_fifo_free(s->fifo[0]); |
| av_audio_fifo_free(s->fifo[1]); |
| } |
| |
| static const AVFilterPad sidechaincompress_inputs[] = { |
| { |
| .name = "main", |
| .type = AVMEDIA_TYPE_AUDIO, |
| },{ |
| .name = "sidechain", |
| .type = AVMEDIA_TYPE_AUDIO, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad sidechaincompress_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_AUDIO, |
| .config_props = config_output, |
| }, |
| { NULL } |
| }; |
| |
| AVFilter ff_af_sidechaincompress = { |
| .name = "sidechaincompress", |
| .description = NULL_IF_CONFIG_SMALL("Sidechain compressor."), |
| .priv_size = sizeof(SidechainCompressContext), |
| .priv_class = &sidechaincompress_class, |
| .query_formats = query_formats, |
| .activate = activate, |
| .uninit = uninit, |
| .inputs = sidechaincompress_inputs, |
| .outputs = sidechaincompress_outputs, |
| .process_command = process_command, |
| }; |
| #endif /* CONFIG_SIDECHAINCOMPRESS_FILTER */ |
| |
| #if CONFIG_ACOMPRESSOR_FILTER |
| static int acompressor_filter_frame(AVFilterLink *inlink, AVFrame *in) |
| { |
| const double *src = (const double *)in->data[0]; |
| AVFilterContext *ctx = inlink->dst; |
| SidechainCompressContext *s = ctx->priv; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| AVFrame *out; |
| double *dst; |
| |
| if (av_frame_is_writable(in)) { |
| out = in; |
| } else { |
| out = ff_get_audio_buffer(outlink, in->nb_samples); |
| if (!out) { |
| av_frame_free(&in); |
| return AVERROR(ENOMEM); |
| } |
| av_frame_copy_props(out, in); |
| } |
| dst = (double *)out->data[0]; |
| |
| compressor(s, src, dst, src, in->nb_samples, |
| s->level_in, s->level_in, |
| inlink, inlink); |
| |
| if (out != in) |
| av_frame_free(&in); |
| return ff_filter_frame(outlink, out); |
| } |
| |
| static int acompressor_query_formats(AVFilterContext *ctx) |
| { |
| AVFilterFormats *formats; |
| AVFilterChannelLayouts *layouts; |
| 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); |
| } |
| |
| #define acompressor_options options |
| AVFILTER_DEFINE_CLASS(acompressor); |
| |
| static const AVFilterPad acompressor_inputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_AUDIO, |
| .filter_frame = acompressor_filter_frame, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad acompressor_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_AUDIO, |
| .config_props = compressor_config_output, |
| }, |
| { NULL } |
| }; |
| |
| AVFilter ff_af_acompressor = { |
| .name = "acompressor", |
| .description = NULL_IF_CONFIG_SMALL("Audio compressor."), |
| .priv_size = sizeof(SidechainCompressContext), |
| .priv_class = &acompressor_class, |
| .query_formats = acompressor_query_formats, |
| .inputs = acompressor_inputs, |
| .outputs = acompressor_outputs, |
| .process_command = process_command, |
| }; |
| #endif /* CONFIG_ACOMPRESSOR_FILTER */ |
