| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * This file is part of FFmpeg. | ||
| 3 | * | ||
| 4 | * FFmpeg is free software; you can redistribute it and/or | ||
| 5 | * modify it under the terms of the GNU Lesser General Public | ||
| 6 | * License as published by the Free Software Foundation; either | ||
| 7 | * version 2.1 of the License, or (at your option) any later version. | ||
| 8 | * | ||
| 9 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 12 | * Lesser General Public License for more details. | ||
| 13 | * | ||
| 14 | * You should have received a copy of the GNU Lesser General Public | ||
| 15 | * License along with FFmpeg; if not, write to the Free Software | ||
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 17 | */ | ||
| 18 | |||
| 19 | #include "libavutil/ffmath.h" | ||
| 20 | #include "libavutil/opt.h" | ||
| 21 | #include "avfilter.h" | ||
| 22 | #include "audio.h" | ||
| 23 | #include "filters.h" | ||
| 24 | |||
| 25 | typedef struct AudioDynamicSmoothContext { | ||
| 26 | const AVClass *class; | ||
| 27 | |||
| 28 | double sensitivity; | ||
| 29 | double basefreq; | ||
| 30 | |||
| 31 | AVFrame *coeffs; | ||
| 32 | } AudioDynamicSmoothContext; | ||
| 33 | |||
| 34 | ✗ | static int config_input(AVFilterLink *inlink) | |
| 35 | { | ||
| 36 | ✗ | AVFilterContext *ctx = inlink->dst; | |
| 37 | ✗ | AudioDynamicSmoothContext *s = ctx->priv; | |
| 38 | |||
| 39 | ✗ | s->coeffs = ff_get_audio_buffer(inlink, 3); | |
| 40 | ✗ | if (!s->coeffs) | |
| 41 | ✗ | return AVERROR(ENOMEM); | |
| 42 | |||
| 43 | ✗ | return 0; | |
| 44 | } | ||
| 45 | |||
| 46 | ✗ | static int filter_frame(AVFilterLink *inlink, AVFrame *in) | |
| 47 | { | ||
| 48 | ✗ | AVFilterContext *ctx = inlink->dst; | |
| 49 | ✗ | AVFilterLink *outlink = ctx->outputs[0]; | |
| 50 | ✗ | AudioDynamicSmoothContext *s = ctx->priv; | |
| 51 | ✗ | const double sensitivity = s->sensitivity; | |
| 52 | ✗ | const double wc = s->basefreq / in->sample_rate; | |
| 53 | AVFrame *out; | ||
| 54 | |||
| 55 | ✗ | if (av_frame_is_writable(in)) { | |
| 56 | ✗ | out = in; | |
| 57 | } else { | ||
| 58 | ✗ | out = ff_get_audio_buffer(outlink, in->nb_samples); | |
| 59 | ✗ | if (!out) { | |
| 60 | ✗ | av_frame_free(&in); | |
| 61 | ✗ | return AVERROR(ENOMEM); | |
| 62 | } | ||
| 63 | ✗ | av_frame_copy_props(out, in); | |
| 64 | } | ||
| 65 | |||
| 66 | ✗ | for (int ch = 0; ch < out->ch_layout.nb_channels; ch++) { | |
| 67 | ✗ | const double *src = (const double *)in->extended_data[ch]; | |
| 68 | ✗ | double *dst = (double *)out->extended_data[ch]; | |
| 69 | ✗ | double *coeffs = (double *)s->coeffs->extended_data[ch]; | |
| 70 | ✗ | double low1 = coeffs[0]; | |
| 71 | ✗ | double low2 = coeffs[1]; | |
| 72 | ✗ | double inz = coeffs[2]; | |
| 73 | |||
| 74 | ✗ | for (int n = 0; n < out->nb_samples; n++) { | |
| 75 | ✗ | double low1z = low1; | |
| 76 | ✗ | double low2z = low2; | |
| 77 | ✗ | double bandz = low2z - low1z; | |
| 78 | ✗ | double wd = wc + sensitivity * fabs(bandz); | |
| 79 | ✗ | double g = fmin(1., wd * (5.9948827 + wd * (-11.969296 + wd * 15.959062))); | |
| 80 | |||
| 81 | ✗ | low1 = low1z + g * (0.5 * (src[n] + inz) - low1z); | |
| 82 | ✗ | low2 = low2z + g * (0.5 * (low1 + low1z) - low2z); | |
| 83 | ✗ | inz = src[n]; | |
| 84 | ✗ | dst[n] = ctx->is_disabled ? src[n] : low2; | |
| 85 | } | ||
| 86 | |||
| 87 | ✗ | coeffs[0] = low1; | |
| 88 | ✗ | coeffs[1] = low2; | |
| 89 | ✗ | coeffs[2] = inz; | |
| 90 | } | ||
| 91 | |||
| 92 | ✗ | if (out != in) | |
| 93 | ✗ | av_frame_free(&in); | |
| 94 | ✗ | return ff_filter_frame(outlink, out); | |
| 95 | } | ||
| 96 | |||
| 97 | ✗ | static av_cold void uninit(AVFilterContext *ctx) | |
| 98 | { | ||
| 99 | ✗ | AudioDynamicSmoothContext *s = ctx->priv; | |
| 100 | |||
| 101 | ✗ | av_frame_free(&s->coeffs); | |
| 102 | ✗ | } | |
| 103 | |||
| 104 | #define OFFSET(x) offsetof(AudioDynamicSmoothContext, x) | ||
| 105 | #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM | ||
| 106 | |||
| 107 | static const AVOption adynamicsmooth_options[] = { | ||
| 108 | { "sensitivity", "set smooth sensitivity", OFFSET(sensitivity), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 0, 1000000, FLAGS }, | ||
| 109 | { "basefreq", "set base frequency", OFFSET(basefreq), AV_OPT_TYPE_DOUBLE, {.dbl=22050}, 2, 1000000, FLAGS }, | ||
| 110 | { NULL } | ||
| 111 | }; | ||
| 112 | |||
| 113 | AVFILTER_DEFINE_CLASS(adynamicsmooth); | ||
| 114 | |||
| 115 | static const AVFilterPad inputs[] = { | ||
| 116 | { | ||
| 117 | .name = "default", | ||
| 118 | .type = AVMEDIA_TYPE_AUDIO, | ||
| 119 | .filter_frame = filter_frame, | ||
| 120 | .config_props = config_input, | ||
| 121 | }, | ||
| 122 | }; | ||
| 123 | |||
| 124 | const AVFilter ff_af_adynamicsmooth = { | ||
| 125 | .name = "adynamicsmooth", | ||
| 126 | .description = NULL_IF_CONFIG_SMALL("Apply Dynamic Smoothing of input audio."), | ||
| 127 | .priv_size = sizeof(AudioDynamicSmoothContext), | ||
| 128 | .priv_class = &adynamicsmooth_class, | ||
| 129 | .uninit = uninit, | ||
| 130 | FILTER_INPUTS(inputs), | ||
| 131 | FILTER_OUTPUTS(ff_audio_default_filterpad), | ||
| 132 | FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_DBLP), | ||
| 133 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL, | ||
| 134 | .process_command = ff_filter_process_command, | ||
| 135 | }; | ||
| 136 |