| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) 2018 Paul B Mahol | ||
| 3 | * | ||
| 4 | * This file is part of FFmpeg. | ||
| 5 | * | ||
| 6 | * FFmpeg is free software; you can redistribute it and/or | ||
| 7 | * modify it under the terms of the GNU Lesser General Public | ||
| 8 | * License as published by the Free Software Foundation; either | ||
| 9 | * version 2.1 of the License, or (at your option) any later version. | ||
| 10 | * | ||
| 11 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 14 | * Lesser General Public License for more details. | ||
| 15 | * | ||
| 16 | * You should have received a copy of the GNU Lesser General Public | ||
| 17 | * License along with FFmpeg; if not, write to the Free Software | ||
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 19 | */ | ||
| 20 | |||
| 21 | #include <float.h> | ||
| 22 | |||
| 23 | #include "libavutil/ffmath.h" | ||
| 24 | #include "libavutil/mem.h" | ||
| 25 | #include "libavutil/opt.h" | ||
| 26 | #include "audio.h" | ||
| 27 | #include "avfilter.h" | ||
| 28 | #include "filters.h" | ||
| 29 | |||
| 30 | #define BINS 32768 | ||
| 31 | |||
| 32 | typedef struct ChannelStats { | ||
| 33 | uint64_t nb_samples; | ||
| 34 | uint64_t blknum; | ||
| 35 | float peak; | ||
| 36 | float sum; | ||
| 37 | uint32_t peaks[BINS+1]; | ||
| 38 | uint32_t rms[BINS+1]; | ||
| 39 | } ChannelStats; | ||
| 40 | |||
| 41 | typedef struct DRMeterContext { | ||
| 42 | const AVClass *class; | ||
| 43 | ChannelStats *chstats; | ||
| 44 | int nb_channels; | ||
| 45 | int64_t tc_samples; | ||
| 46 | double time_constant; | ||
| 47 | } DRMeterContext; | ||
| 48 | |||
| 49 | #define OFFSET(x) offsetof(DRMeterContext, x) | ||
| 50 | #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM | ||
| 51 | |||
| 52 | static const AVOption drmeter_options[] = { | ||
| 53 | { "length", "set the window length", OFFSET(time_constant), AV_OPT_TYPE_DOUBLE, {.dbl=3}, .01, 10, FLAGS }, | ||
| 54 | { NULL } | ||
| 55 | }; | ||
| 56 | |||
| 57 | AVFILTER_DEFINE_CLASS(drmeter); | ||
| 58 | |||
| 59 | ✗ | static int config_output(AVFilterLink *outlink) | |
| 60 | { | ||
| 61 | ✗ | DRMeterContext *s = outlink->src->priv; | |
| 62 | |||
| 63 | ✗ | s->chstats = av_calloc(outlink->ch_layout.nb_channels, sizeof(*s->chstats)); | |
| 64 | ✗ | if (!s->chstats) | |
| 65 | ✗ | return AVERROR(ENOMEM); | |
| 66 | ✗ | s->nb_channels = outlink->ch_layout.nb_channels; | |
| 67 | ✗ | s->tc_samples = lrint(s->time_constant * outlink->sample_rate); | |
| 68 | |||
| 69 | ✗ | return 0; | |
| 70 | } | ||
| 71 | |||
| 72 | ✗ | static void finish_block(ChannelStats *p) | |
| 73 | { | ||
| 74 | int peak_bin, rms_bin; | ||
| 75 | float peak, rms; | ||
| 76 | |||
| 77 | ✗ | rms = sqrtf(2.f * p->sum / p->nb_samples); | |
| 78 | ✗ | peak = p->peak; | |
| 79 | ✗ | rms_bin = av_clip(lrintf(rms * BINS), 0, BINS); | |
| 80 | ✗ | peak_bin = av_clip(lrintf(peak * BINS), 0, BINS); | |
| 81 | ✗ | p->rms[rms_bin]++; | |
| 82 | ✗ | p->peaks[peak_bin]++; | |
| 83 | |||
| 84 | ✗ | p->peak = 0; | |
| 85 | ✗ | p->sum = 0; | |
| 86 | ✗ | p->nb_samples = 0; | |
| 87 | ✗ | p->blknum++; | |
| 88 | ✗ | } | |
| 89 | |||
| 90 | ✗ | static void update_stat(DRMeterContext *s, ChannelStats *p, float sample) | |
| 91 | { | ||
| 92 | ✗ | p->peak = fmaxf(fabsf(sample), p->peak); | |
| 93 | ✗ | p->sum += sample * sample; | |
| 94 | ✗ | p->nb_samples++; | |
| 95 | ✗ | if (p->nb_samples >= s->tc_samples) | |
| 96 | ✗ | finish_block(p); | |
| 97 | ✗ | } | |
| 98 | |||
| 99 | ✗ | static int filter_frame(AVFilterLink *inlink, AVFrame *buf) | |
| 100 | { | ||
| 101 | ✗ | DRMeterContext *s = inlink->dst->priv; | |
| 102 | ✗ | const int channels = s->nb_channels; | |
| 103 | |||
| 104 | ✗ | switch (inlink->format) { | |
| 105 | ✗ | case AV_SAMPLE_FMT_FLTP: | |
| 106 | ✗ | for (int c = 0; c < channels; c++) { | |
| 107 | ✗ | ChannelStats *p = &s->chstats[c]; | |
| 108 | ✗ | const float *src = (const float *)buf->extended_data[c]; | |
| 109 | |||
| 110 | ✗ | for (int i = 0; i < buf->nb_samples; i++, src++) | |
| 111 | ✗ | update_stat(s, p, *src); | |
| 112 | } | ||
| 113 | ✗ | break; | |
| 114 | ✗ | case AV_SAMPLE_FMT_FLT: { | |
| 115 | ✗ | const float *src = (const float *)buf->extended_data[0]; | |
| 116 | |||
| 117 | ✗ | for (int i = 0; i < buf->nb_samples; i++) { | |
| 118 | ✗ | for (int c = 0; c < channels; c++, src++) | |
| 119 | ✗ | update_stat(s, &s->chstats[c], *src); | |
| 120 | }} | ||
| 121 | ✗ | break; | |
| 122 | } | ||
| 123 | |||
| 124 | ✗ | return ff_filter_frame(inlink->dst->outputs[0], buf); | |
| 125 | } | ||
| 126 | |||
| 127 | #define SQR(a) ((a)*(a)) | ||
| 128 | |||
| 129 | ✗ | static void print_stats(AVFilterContext *ctx) | |
| 130 | { | ||
| 131 | ✗ | DRMeterContext *s = ctx->priv; | |
| 132 | ✗ | float dr = 0.f; | |
| 133 | |||
| 134 | ✗ | for (int ch = 0; ch < s->nb_channels; ch++) { | |
| 135 | ✗ | ChannelStats *p = &s->chstats[ch]; | |
| 136 | ✗ | float chdr, secondpeak, rmssum = 0.f; | |
| 137 | ✗ | int first = 0, last = lrintf(0.2f * p->blknum); | |
| 138 | ✗ | int peak_bin = BINS; | |
| 139 | |||
| 140 | ✗ | if (!p->nb_samples) { | |
| 141 | ✗ | av_log(ctx, AV_LOG_INFO, "No data, dynamic range not meassurable\n"); | |
| 142 | ✗ | return; | |
| 143 | } | ||
| 144 | |||
| 145 | ✗ | if (p->nb_samples) | |
| 146 | ✗ | finish_block(p); | |
| 147 | |||
| 148 | ✗ | for (int i = BINS; i >= 0; i--) { | |
| 149 | ✗ | if (p->peaks[i]) { | |
| 150 | ✗ | if (first || p->peaks[i] > 1) { | |
| 151 | ✗ | peak_bin = i; | |
| 152 | ✗ | break; | |
| 153 | } | ||
| 154 | ✗ | first = 1; | |
| 155 | } | ||
| 156 | } | ||
| 157 | |||
| 158 | ✗ | secondpeak = peak_bin / (float)BINS; | |
| 159 | |||
| 160 | ✗ | for (int64_t i = BINS, j = 0; i >= 0 && j < last; i--) { | |
| 161 | ✗ | if (p->rms[i]) { | |
| 162 | ✗ | rmssum += SQR(i / (float)BINS) * p->rms[i]; | |
| 163 | ✗ | j += p->rms[i]; | |
| 164 | } | ||
| 165 | } | ||
| 166 | |||
| 167 | ✗ | chdr = 20.f * log10f(secondpeak / sqrtf(rmssum / (float)last)); | |
| 168 | ✗ | dr += chdr; | |
| 169 | ✗ | av_log(ctx, AV_LOG_INFO, "Channel %d: DR: %g\n", ch + 1, chdr); | |
| 170 | } | ||
| 171 | |||
| 172 | ✗ | av_log(ctx, AV_LOG_INFO, "Overall DR: %g\n", dr / s->nb_channels); | |
| 173 | } | ||
| 174 | |||
| 175 | ✗ | static av_cold void uninit(AVFilterContext *ctx) | |
| 176 | { | ||
| 177 | ✗ | DRMeterContext *s = ctx->priv; | |
| 178 | |||
| 179 | ✗ | if (s->nb_channels) | |
| 180 | ✗ | print_stats(ctx); | |
| 181 | ✗ | av_freep(&s->chstats); | |
| 182 | ✗ | } | |
| 183 | |||
| 184 | static const AVFilterPad drmeter_inputs[] = { | ||
| 185 | { | ||
| 186 | .name = "default", | ||
| 187 | .type = AVMEDIA_TYPE_AUDIO, | ||
| 188 | .filter_frame = filter_frame, | ||
| 189 | }, | ||
| 190 | }; | ||
| 191 | |||
| 192 | static const AVFilterPad drmeter_outputs[] = { | ||
| 193 | { | ||
| 194 | .name = "default", | ||
| 195 | .type = AVMEDIA_TYPE_AUDIO, | ||
| 196 | .config_props = config_output, | ||
| 197 | }, | ||
| 198 | }; | ||
| 199 | |||
| 200 | const AVFilter ff_af_drmeter = { | ||
| 201 | .name = "drmeter", | ||
| 202 | .description = NULL_IF_CONFIG_SMALL("Measure audio dynamic range."), | ||
| 203 | .priv_size = sizeof(DRMeterContext), | ||
| 204 | .priv_class = &drmeter_class, | ||
| 205 | .uninit = uninit, | ||
| 206 | .flags = AVFILTER_FLAG_METADATA_ONLY, | ||
| 207 | FILTER_INPUTS(drmeter_inputs), | ||
| 208 | FILTER_OUTPUTS(drmeter_outputs), | ||
| 209 | FILTER_SAMPLEFMTS(AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_FLT), | ||
| 210 | }; | ||
| 211 |