From d3836b603e7e07c681dd09f42f56d6cdeacfd016 Mon Sep 17 00:00:00 2001 From: Paul B Mahol Date: Mon, 29 Jun 2015 21:14:53 +0000 Subject: avfilter/af_astats: export metadata Signed-off-by: Paul B Mahol --- libavfilter/af_astats.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 78 insertions(+), 2 deletions(-) (limited to 'libavfilter/af_astats.c') diff --git a/libavfilter/af_astats.c b/libavfilter/af_astats.c index 5780fb900a..24cbadd956 100644 --- a/libavfilter/af_astats.c +++ b/libavfilter/af_astats.c @@ -44,6 +44,7 @@ typedef struct { uint64_t tc_samples; double time_constant; double mult; + int metadata; } AudioStatsContext; #define OFFSET(x) offsetof(AudioStatsContext, x) @@ -51,6 +52,7 @@ typedef struct { static const AVOption astats_options[] = { { "length", "set the window length", OFFSET(time_constant), AV_OPT_TYPE_DOUBLE, {.dbl=.05}, .01, 10, FLAGS }, + { "metadata", "inject metadata in the filtergraph", OFFSET(metadata), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS }, { NULL } }; @@ -146,9 +148,82 @@ static inline void update_stat(AudioStatsContext *s, ChannelStats *p, double d) p->nb_samples++; } +static void set_meta(AVDictionary **metadata, int chan, const char *key, + const char *fmt, double val) +{ + uint8_t value[128]; + uint8_t key2[128]; + + snprintf(value, sizeof(value), fmt, val); + if (chan) + snprintf(key2, sizeof(key2), "lavfi.astats.%d.%s", chan, key); + else + snprintf(key2, sizeof(key2), "lavfi.astats.%s", key); + av_dict_set(metadata, key2, value, 0); +} + +#define LINEAR_TO_DB(x) (log10(x) * 20) + +static void set_metadata(AudioStatsContext *s, AVDictionary **metadata) +{ + uint64_t min_count = 0, max_count = 0, nb_samples = 0; + double min_runs = 0, max_runs = 0, + min = DBL_MAX, max = DBL_MIN, + max_sigma_x = 0, + sigma_x = 0, + sigma_x2 = 0, + min_sigma_x2 = DBL_MAX, + max_sigma_x2 = DBL_MIN; + int c; + + for (c = 0; c < s->nb_channels; c++) { + ChannelStats *p = &s->chstats[c]; + + if (p->nb_samples < s->tc_samples) + p->min_sigma_x2 = p->max_sigma_x2 = p->sigma_x2 / p->nb_samples; + + min = FFMIN(min, p->min); + max = FFMAX(max, p->max); + min_sigma_x2 = FFMIN(min_sigma_x2, p->min_sigma_x2); + max_sigma_x2 = FFMAX(max_sigma_x2, p->max_sigma_x2); + sigma_x += p->sigma_x; + sigma_x2 += p->sigma_x2; + min_count += p->min_count; + max_count += p->max_count; + min_runs += p->min_runs; + max_runs += p->max_runs; + nb_samples += p->nb_samples; + if (fabs(p->sigma_x) > fabs(max_sigma_x)) + max_sigma_x = p->sigma_x; + + set_meta(metadata, c + 1, "DC_offset", "%f", p->sigma_x / p->nb_samples); + set_meta(metadata, c + 1, "Min_level", "%f", p->min); + set_meta(metadata, c + 1, "Max_level", "%f", p->max); + set_meta(metadata, c + 1, "Peak_level", "%f", LINEAR_TO_DB(FFMAX(-p->min, p->max))); + set_meta(metadata, c + 1, "RMS_level", "%f", LINEAR_TO_DB(sqrt(p->sigma_x2 / p->nb_samples))); + set_meta(metadata, c + 1, "RMS_peak", "%f", LINEAR_TO_DB(sqrt(p->max_sigma_x2))); + set_meta(metadata, c + 1, "RMS_trough", "%f", LINEAR_TO_DB(sqrt(p->min_sigma_x2))); + set_meta(metadata, c + 1, "Crest_factor", "%f", p->sigma_x2 ? FFMAX(-p->min, p->max) / sqrt(p->sigma_x2 / p->nb_samples) : 1); + set_meta(metadata, c + 1, "Flat_factor", "%f", LINEAR_TO_DB((p->min_runs + p->max_runs) / (p->min_count + p->max_count))); + set_meta(metadata, c + 1, "Peak_count", "%f", (float)(p->min_count + p->max_count)); + } + + set_meta(metadata, 0, "Overall.DC_offset", "%f", max_sigma_x / (nb_samples / s->nb_channels)); + set_meta(metadata, 0, "Overall.Min_level", "%f", min); + set_meta(metadata, 0, "Overall.Max_level", "%f", max); + set_meta(metadata, 0, "Overall.Peak_level", "%f", LINEAR_TO_DB(FFMAX(-min, max))); + set_meta(metadata, 0, "Overall.RMS_level", "%f", LINEAR_TO_DB(sqrt(sigma_x2 / nb_samples))); + set_meta(metadata, 0, "Overall.RMS_peak", "%f", LINEAR_TO_DB(sqrt(max_sigma_x2))); + set_meta(metadata, 0, "Overall.RMS_trough", "%f", LINEAR_TO_DB(sqrt(min_sigma_x2))); + set_meta(metadata, 0, "Overall.Flat_factor", "%f", LINEAR_TO_DB((min_runs + max_runs) / (min_count + max_count))); + set_meta(metadata, 0, "Overall.Peak_count", "%f", (float)(min_count + max_count) / (double)s->nb_channels); + set_meta(metadata, 0, "Overall.Number_of_samples", "%f", nb_samples / s->nb_channels); +} + static int filter_frame(AVFilterLink *inlink, AVFrame *buf) { AudioStatsContext *s = inlink->dst->priv; + AVDictionary **metadata = avpriv_frame_get_metadatap(buf); const int channels = s->nb_channels; const double *src; int i, c; @@ -173,11 +248,12 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *buf) break; } + if (s->metadata) + set_metadata(s, metadata); + return ff_filter_frame(inlink->dst->outputs[0], buf); } -#define LINEAR_TO_DB(x) (log10(x) * 20) - static void print_stats(AVFilterContext *ctx) { AudioStatsContext *s = ctx->priv; -- cgit v1.2.3