avfilter/af_astats: extend bitdepth calculation

libavfilter/af_astats.c

@@ -35,7 +35,7 @@ typedef struct ChannelStats {
     double min_runs, max_runs;
     double min_diff, max_diff;
     double diff1_sum;
-    uint64_t mask;
+    uint64_t mask, imask;
     uint64_t min_count, max_count;
     uint64_t nb_samples;
 } ChannelStats;
@@ -116,6 +116,7 @@ static void reset_stats(AudioStatsContext *s)
         p->max_runs = 0;
         p->diff1_sum = 0;
         p->mask = 0;
+        p->imask = 0xFFFFFFFFFFFFFFFF;
         p->min_count = 0;
         p->max_count = 0;
         p->nb_samples = 0;
@@ -139,13 +140,20 @@ static int config_output(AVFilterLink *outlink)
     return 0;
 }
 
-static unsigned bit_depth(uint64_t mask)
+static void bit_depth(uint64_t mask, uint64_t imask, AVRational *depth)
 {
     unsigned result = 64;
 
+    mask = mask & (~imask);
+
     for (; result && !(mask & 1); --result, mask >>= 1);
 
-    return result;
+    depth->den = result;
+    depth->num = 0;
+
+    for (; result; --result, mask >>= 1)
+        if (mask & 1)
+            depth->num++;
 }
 
 static inline void update_stat(AudioStatsContext *s, ChannelStats *p, double d)
@@ -182,6 +190,7 @@ static inline void update_stat(AudioStatsContext *s, ChannelStats *p, double d)
     p->diff1_sum += fabs(d - p->last);
     p->last = d;
     p->mask |= llrint(d * (UINT64_C(1) << 63));
+    p->imask &= llrint(d * (UINT64_C(1) << 63));
 
     if (p->nb_samples >= s->tc_samples) {
         p->max_sigma_x2 = FFMAX(p->max_sigma_x2, p->avg_sigma_x2);
@@ -208,7 +217,7 @@ static void set_meta(AVDictionary **metadata, int chan, const char *key,
 
 static void set_metadata(AudioStatsContext *s, AVDictionary **metadata)
 {
-    uint64_t mask = 0, min_count = 0, max_count = 0, nb_samples = 0;
+    uint64_t mask = 0, imask = 0xFFFFFFFFFFFFFFFF, min_count = 0, max_count = 0, nb_samples = 0;
     double min_runs = 0, max_runs = 0,
            min = DBL_MAX, max = DBL_MIN, min_diff = DBL_MAX, max_diff = 0,
            max_sigma_x = 0,
@@ -217,6 +226,7 @@ static void set_metadata(AudioStatsContext *s, AVDictionary **metadata)
            sigma_x2 = 0,
            min_sigma_x2 = DBL_MAX,
            max_sigma_x2 = DBL_MIN;
+    AVRational depth;
     int c;
 
     for (c = 0; c < s->nb_channels; c++) {
@@ -239,6 +249,7 @@ static void set_metadata(AudioStatsContext *s, AVDictionary **metadata)
         min_runs += p->min_runs;
         max_runs += p->max_runs;
         mask |= p->mask;
+        imask &= p->imask;
         nb_samples += p->nb_samples;
         if (fabs(p->sigma_x) > fabs(max_sigma_x))
             max_sigma_x = p->sigma_x;
@@ -256,7 +267,9 @@ static void set_metadata(AudioStatsContext *s, AVDictionary **metadata)
         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, c + 1, "Bit_depth", "%f", bit_depth(p->mask));
+        bit_depth(p->mask, p->imask, &depth);
+        set_meta(metadata, c + 1, "Bit_depth", "%f", depth.num);
+        set_meta(metadata, c + 1, "Bit_depth2", "%f", depth.den);
     }
 
     set_meta(metadata, 0, "Overall.DC_offset", "%f", max_sigma_x / (nb_samples / s->nb_channels));
@@ -271,7 +284,9 @@ static void set_metadata(AudioStatsContext *s, AVDictionary **metadata)
     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.Bit_depth", "%f", bit_depth(mask));
+    bit_depth(mask, imask, &depth);
+    set_meta(metadata, 0, "Overall.Bit_depth", "%f", depth.num);
+    set_meta(metadata, 0, "Overall.Bit_depth2", "%f", depth.den);
     set_meta(metadata, 0, "Overall.Number_of_samples", "%f", nb_samples / s->nb_channels);
 }
 
@@ -320,7 +335,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
 static void print_stats(AVFilterContext *ctx)
 {
     AudioStatsContext *s = ctx->priv;
-    uint64_t mask = 0, min_count = 0, max_count = 0, nb_samples = 0;
+    uint64_t mask = 0, imask = 0xFFFFFFFFFFFFFFFF, min_count = 0, max_count = 0, nb_samples = 0;
     double min_runs = 0, max_runs = 0,
            min = DBL_MAX, max = DBL_MIN, min_diff = DBL_MAX, max_diff = 0,
            max_sigma_x = 0,
@@ -329,6 +344,7 @@ static void print_stats(AVFilterContext *ctx)
            sigma_x2 = 0,
            min_sigma_x2 = DBL_MAX,
            max_sigma_x2 = DBL_MIN;
+    AVRational depth;
     int c;
 
     for (c = 0; c < s->nb_channels; c++) {
@@ -351,6 +367,7 @@ static void print_stats(AVFilterContext *ctx)
         min_runs += p->min_runs;
         max_runs += p->max_runs;
         mask |= p->mask;
+        imask &= p->imask;
         nb_samples += p->nb_samples;
         if (fabs(p->sigma_x) > fabs(max_sigma_x))
             max_sigma_x = p->sigma_x;
@@ -370,7 +387,8 @@ static void print_stats(AVFilterContext *ctx)
         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);
         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)));
         av_log(ctx, AV_LOG_INFO, "Peak count: %"PRId64"\n", p->min_count + p->max_count);
-        av_log(ctx, AV_LOG_INFO, "Bit depth: %u\n", bit_depth(p->mask));
+        bit_depth(p->mask, p->imask, &depth);
+        av_log(ctx, AV_LOG_INFO, "Bit depth: %u/%u\n", depth.num, depth.den);
     }
 
     av_log(ctx, AV_LOG_INFO, "Overall\n");
@@ -387,7 +405,8 @@ static void print_stats(AVFilterContext *ctx)
         av_log(ctx, AV_LOG_INFO, "RMS trough dB: %f\n", LINEAR_TO_DB(sqrt(min_sigma_x2)));
     av_log(ctx, AV_LOG_INFO, "Flat factor: %f\n", LINEAR_TO_DB((min_runs + max_runs) / (min_count + max_count)));
     av_log(ctx, AV_LOG_INFO, "Peak count: %f\n", (min_count + max_count) / (double)s->nb_channels);
-    av_log(ctx, AV_LOG_INFO, "Bit depth: %u\n", bit_depth(mask));
+    bit_depth(mask, imask, &depth);
+    av_log(ctx, AV_LOG_INFO, "Bit depth: %u/%u\n", depth.num, depth.den);
     av_log(ctx, AV_LOG_INFO, "Number of samples: %"PRId64"\n", nb_samples / s->nb_channels);
 }