| 1 | /* |
| 2 | * Copyright (c) 2009 Rob Sykes <robs@users.sourceforge.net> |
| 3 | * Copyright (c) 2013 Paul B Mahol |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | #include <float.h> |
| 23 | |
| 24 | #include "libavutil/opt.h" |
| 25 | #include "audio.h" |
| 26 | #include "avfilter.h" |
| 27 | #include "internal.h" |
| 28 | |
| 29 | typedef struct ChannelStats { |
| 30 | double last; |
| 31 | double sigma_x, sigma_x2; |
| 32 | double avg_sigma_x2, min_sigma_x2, max_sigma_x2; |
| 33 | double min, max; |
| 34 | double min_run, max_run; |
| 35 | double min_runs, max_runs; |
| 36 | uint64_t min_count, max_count; |
| 37 | uint64_t nb_samples; |
| 38 | } ChannelStats; |
| 39 | |
| 40 | typedef struct { |
| 41 | const AVClass *class; |
| 42 | ChannelStats *chstats; |
| 43 | int nb_channels; |
| 44 | uint64_t tc_samples; |
| 45 | double time_constant; |
| 46 | double mult; |
| 47 | } AudioStatsContext; |
| 48 | |
| 49 | #define OFFSET(x) offsetof(AudioStatsContext, x) |
| 50 | #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
| 51 | |
| 52 | static const AVOption astats_options[] = { |
| 53 | { "length", "set the window length", OFFSET(time_constant), AV_OPT_TYPE_DOUBLE, {.dbl=.05}, .01, 10, FLAGS }, |
| 54 | { NULL } |
| 55 | }; |
| 56 | |
| 57 | AVFILTER_DEFINE_CLASS(astats); |
| 58 | |
| 59 | static int query_formats(AVFilterContext *ctx) |
| 60 | { |
| 61 | AVFilterFormats *formats; |
| 62 | AVFilterChannelLayouts *layouts; |
| 63 | static const enum AVSampleFormat sample_fmts[] = { |
| 64 | AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBLP, |
| 65 | AV_SAMPLE_FMT_NONE |
| 66 | }; |
| 67 | |
| 68 | layouts = ff_all_channel_layouts(); |
| 69 | if (!layouts) |
| 70 | return AVERROR(ENOMEM); |
| 71 | ff_set_common_channel_layouts(ctx, layouts); |
| 72 | |
| 73 | formats = ff_make_format_list(sample_fmts); |
| 74 | if (!formats) |
| 75 | return AVERROR(ENOMEM); |
| 76 | ff_set_common_formats(ctx, formats); |
| 77 | |
| 78 | formats = ff_all_samplerates(); |
| 79 | if (!formats) |
| 80 | return AVERROR(ENOMEM); |
| 81 | ff_set_common_samplerates(ctx, formats); |
| 82 | |
| 83 | return 0; |
| 84 | } |
| 85 | |
| 86 | static int config_output(AVFilterLink *outlink) |
| 87 | { |
| 88 | AudioStatsContext *s = outlink->src->priv; |
| 89 | int c; |
| 90 | |
| 91 | s->chstats = av_calloc(sizeof(*s->chstats), outlink->channels); |
| 92 | if (!s->chstats) |
| 93 | return AVERROR(ENOMEM); |
| 94 | s->nb_channels = outlink->channels; |
| 95 | s->mult = exp((-1 / s->time_constant / outlink->sample_rate)); |
| 96 | s->tc_samples = 5 * s->time_constant * outlink->sample_rate + .5; |
| 97 | |
| 98 | for (c = 0; c < s->nb_channels; c++) { |
| 99 | ChannelStats *p = &s->chstats[c]; |
| 100 | |
| 101 | p->min = p->min_sigma_x2 = DBL_MAX; |
| 102 | p->max = p->max_sigma_x2 = DBL_MIN; |
| 103 | } |
| 104 | |
| 105 | return 0; |
| 106 | } |
| 107 | |
| 108 | static inline void update_stat(AudioStatsContext *s, ChannelStats *p, double d) |
| 109 | { |
| 110 | if (d < p->min) { |
| 111 | p->min = d; |
| 112 | p->min_run = 1; |
| 113 | p->min_runs = 0; |
| 114 | p->min_count = 1; |
| 115 | } else if (d == p->min) { |
| 116 | p->min_count++; |
| 117 | p->min_run = d == p->last ? p->min_run + 1 : 1; |
| 118 | } else if (p->last == p->min) { |
| 119 | p->min_runs += p->min_run * p->min_run; |
| 120 | } |
| 121 | |
| 122 | if (d > p->max) { |
| 123 | p->max = d; |
| 124 | p->max_run = 1; |
| 125 | p->max_runs = 0; |
| 126 | p->max_count = 1; |
| 127 | } else if (d == p->max) { |
| 128 | p->max_count++; |
| 129 | p->max_run = d == p->last ? p->max_run + 1 : 1; |
| 130 | } else if (p->last == p->max) { |
| 131 | p->max_runs += p->max_run * p->max_run; |
| 132 | } |
| 133 | |
| 134 | p->sigma_x += d; |
| 135 | p->sigma_x2 += d * d; |
| 136 | p->avg_sigma_x2 = p->avg_sigma_x2 * s->mult + (1.0 - s->mult) * d * d; |
| 137 | p->last = d; |
| 138 | |
| 139 | if (p->nb_samples >= s->tc_samples) { |
| 140 | p->max_sigma_x2 = FFMAX(p->max_sigma_x2, p->avg_sigma_x2); |
| 141 | p->min_sigma_x2 = FFMIN(p->min_sigma_x2, p->avg_sigma_x2); |
| 142 | } |
| 143 | p->nb_samples++; |
| 144 | } |
| 145 | |
| 146 | static int filter_frame(AVFilterLink *inlink, AVFrame *buf) |
| 147 | { |
| 148 | AudioStatsContext *s = inlink->dst->priv; |
| 149 | const int channels = s->nb_channels; |
| 150 | const double *src; |
| 151 | int i, c; |
| 152 | |
| 153 | switch (inlink->format) { |
| 154 | case AV_SAMPLE_FMT_DBLP: |
| 155 | for (c = 0; c < channels; c++) { |
| 156 | ChannelStats *p = &s->chstats[c]; |
| 157 | src = (const double *)buf->extended_data[c]; |
| 158 | |
| 159 | for (i = 0; i < buf->nb_samples; i++, src++) |
| 160 | update_stat(s, p, *src); |
| 161 | } |
| 162 | break; |
| 163 | case AV_SAMPLE_FMT_DBL: |
| 164 | src = (const double *)buf->extended_data[0]; |
| 165 | |
| 166 | for (i = 0; i < buf->nb_samples; i++) { |
| 167 | for (c = 0; c < channels; c++, src++) |
| 168 | update_stat(s, &s->chstats[c], *src); |
| 169 | } |
| 170 | break; |
| 171 | } |
| 172 | |
| 173 | return ff_filter_frame(inlink->dst->outputs[0], buf); |
| 174 | } |
| 175 | |
| 176 | #define LINEAR_TO_DB(x) (log10(x) * 20) |
| 177 | |
| 178 | static void print_stats(AVFilterContext *ctx) |
| 179 | { |
| 180 | AudioStatsContext *s = ctx->priv; |
| 181 | uint64_t min_count = 0, max_count = 0, nb_samples = 0; |
| 182 | double min_runs = 0, max_runs = 0, |
| 183 | min = DBL_MAX, max = DBL_MIN, |
| 184 | max_sigma_x = 0, |
| 185 | sigma_x = 0, |
| 186 | sigma_x2 = 0, |
| 187 | min_sigma_x2 = DBL_MAX, |
| 188 | max_sigma_x2 = DBL_MIN; |
| 189 | int c; |
| 190 | |
| 191 | for (c = 0; c < s->nb_channels; c++) { |
| 192 | ChannelStats *p = &s->chstats[c]; |
| 193 | |
| 194 | if (p->nb_samples < s->tc_samples) |
| 195 | p->min_sigma_x2 = p->max_sigma_x2 = p->sigma_x2 / p->nb_samples; |
| 196 | |
| 197 | min = FFMIN(min, p->min); |
| 198 | max = FFMAX(max, p->max); |
| 199 | min_sigma_x2 = FFMIN(min_sigma_x2, p->min_sigma_x2); |
| 200 | max_sigma_x2 = FFMAX(max_sigma_x2, p->max_sigma_x2); |
| 201 | sigma_x += p->sigma_x; |
| 202 | sigma_x2 += p->sigma_x2; |
| 203 | min_count += p->min_count; |
| 204 | max_count += p->max_count; |
| 205 | min_runs += p->min_runs; |
| 206 | max_runs += p->max_runs; |
| 207 | nb_samples += p->nb_samples; |
| 208 | if (fabs(p->sigma_x) > fabs(max_sigma_x)) |
| 209 | max_sigma_x = p->sigma_x; |
| 210 | |
| 211 | av_log(ctx, AV_LOG_INFO, "Channel: %d\n", c + 1); |
| 212 | av_log(ctx, AV_LOG_INFO, "DC offset: %f\n", p->sigma_x / p->nb_samples); |
| 213 | av_log(ctx, AV_LOG_INFO, "Min level: %f\n", p->min); |
| 214 | av_log(ctx, AV_LOG_INFO, "Max level: %f\n", p->max); |
| 215 | av_log(ctx, AV_LOG_INFO, "Peak level dB: %f\n", LINEAR_TO_DB(FFMAX(-p->min, p->max))); |
| 216 | av_log(ctx, AV_LOG_INFO, "RMS level dB: %f\n", LINEAR_TO_DB(sqrt(p->sigma_x2 / p->nb_samples))); |
| 217 | av_log(ctx, AV_LOG_INFO, "RMS peak dB: %f\n", LINEAR_TO_DB(sqrt(p->max_sigma_x2))); |
| 218 | if (p->min_sigma_x2 != 1) |
| 219 | av_log(ctx, AV_LOG_INFO, "RMS trough dB: %f\n",LINEAR_TO_DB(sqrt(p->min_sigma_x2))); |
| 220 | av_log(ctx, AV_LOG_INFO, "Crest factor: %f\n", p->sigma_x2 ? FFMAX(-p->min, p->max) / sqrt(p->sigma_x2 / p->nb_samples) : 1); |
| 221 | av_log(ctx, AV_LOG_INFO, "Flat factor: %f\n", LINEAR_TO_DB((p->min_runs + p->max_runs) / (p->min_count + p->max_count))); |
| 222 | av_log(ctx, AV_LOG_INFO, "Peak count: %"PRId64"\n", p->min_count + p->max_count); |
| 223 | } |
| 224 | |
| 225 | av_log(ctx, AV_LOG_INFO, "Overall\n"); |
| 226 | av_log(ctx, AV_LOG_INFO, "DC offset: %f\n", max_sigma_x / (nb_samples / s->nb_channels)); |
| 227 | av_log(ctx, AV_LOG_INFO, "Min level: %f\n", min); |
| 228 | av_log(ctx, AV_LOG_INFO, "Max level: %f\n", max); |
| 229 | av_log(ctx, AV_LOG_INFO, "Peak level dB: %f\n", LINEAR_TO_DB(FFMAX(-min, max))); |
| 230 | av_log(ctx, AV_LOG_INFO, "RMS level dB: %f\n", LINEAR_TO_DB(sqrt(sigma_x2 / nb_samples))); |
| 231 | av_log(ctx, AV_LOG_INFO, "RMS peak dB: %f\n", LINEAR_TO_DB(sqrt(max_sigma_x2))); |
| 232 | if (min_sigma_x2 != 1) |
| 233 | av_log(ctx, AV_LOG_INFO, "RMS trough dB: %f\n", LINEAR_TO_DB(sqrt(min_sigma_x2))); |
| 234 | av_log(ctx, AV_LOG_INFO, "Flat factor: %f\n", LINEAR_TO_DB((min_runs + max_runs) / (min_count + max_count))); |
| 235 | av_log(ctx, AV_LOG_INFO, "Peak count: %f\n", (min_count + max_count) / (double)s->nb_channels); |
| 236 | av_log(ctx, AV_LOG_INFO, "Number of samples: %"PRId64"\n", nb_samples / s->nb_channels); |
| 237 | } |
| 238 | |
| 239 | static av_cold void uninit(AVFilterContext *ctx) |
| 240 | { |
| 241 | AudioStatsContext *s = ctx->priv; |
| 242 | |
| 243 | print_stats(ctx); |
| 244 | av_freep(&s->chstats); |
| 245 | } |
| 246 | |
| 247 | static const AVFilterPad astats_inputs[] = { |
| 248 | { |
| 249 | .name = "default", |
| 250 | .type = AVMEDIA_TYPE_AUDIO, |
| 251 | .filter_frame = filter_frame, |
| 252 | }, |
| 253 | { NULL } |
| 254 | }; |
| 255 | |
| 256 | static const AVFilterPad astats_outputs[] = { |
| 257 | { |
| 258 | .name = "default", |
| 259 | .type = AVMEDIA_TYPE_AUDIO, |
| 260 | .config_props = config_output, |
| 261 | }, |
| 262 | { NULL } |
| 263 | }; |
| 264 | |
| 265 | AVFilter ff_af_astats = { |
| 266 | .name = "astats", |
| 267 | .description = NULL_IF_CONFIG_SMALL("Show time domain statistics about audio frames."), |
| 268 | .query_formats = query_formats, |
| 269 | .priv_size = sizeof(AudioStatsContext), |
| 270 | .priv_class = &astats_class, |
| 271 | .uninit = uninit, |
| 272 | .inputs = astats_inputs, |
| 273 | .outputs = astats_outputs, |
| 274 | }; |