[FFmpeg-devel] [PATCH v3] libavfilter/vf_blackdetect.c

[Jonathan Baecker]

Here the cleanup version from the patch.
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From b6b6e4ab885f9b35a6696492286e504a4b3d6d92 Mon Sep 17 00:00:00 2001
From: Jonathan <jonbae77 at gmail.com>
Date: Mon, 4 Dec 2017 16:05:48 +0100
Subject: [PATCH] unify blackdetect with af_silencedetect. Is more useful for
 monitoring streams.

---
 libavfilter/vf_blackdetect.c | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/libavfilter/vf_blackdetect.c b/libavfilter/vf_blackdetect.c
index 06ef9988d..92ea39b33 100644
--- a/libavfilter/vf_blackdetect.c
+++ b/libavfilter/vf_blackdetect.c
@@ -38,6 +38,7 @@ typedef struct BlackDetectContext {
     int64_t black_end;               ///< pts end time of the last black picture
     int64_t last_picref_pts;         ///< pts of the last input picture
     int black_started;
+    int black_match;

     double       picture_black_ratio_th;
     double       pixel_black_th;
@@ -107,15 +108,20 @@ static int config_input(AVFilterLink *inlink)
     return 0;
 }

-static void check_black_end(AVFilterContext *ctx)
+static void check_black(AVFilterContext *ctx)
 {
     BlackDetectContext *blackdetect = ctx->priv;
     AVFilterLink *inlink = ctx->inputs[0];

-    if ((blackdetect->black_end - blackdetect->black_start) >= blackdetect->black_min_duration) {
+    if (blackdetect->last_picref_pts - blackdetect->black_start >= blackdetect->black_min_duration && blackdetect->black_match == 0) {
         av_log(blackdetect, AV_LOG_INFO,
-               "black_start:%s black_end:%s black_duration:%s\n",
-               av_ts2timestr(blackdetect->black_start, &inlink->time_base),
+               "black_start:%s\n",
+               av_ts2timestr(blackdetect->black_start, &inlink->time_base));
+        blackdetect->black_match = 1;
+    }
+    if (blackdetect->black_end - blackdetect->black_start >= blackdetect->black_min_duration && blackdetect->black_started == 1) {
+        av_log(blackdetect, AV_LOG_INFO,
+               "black_end:%s | black_duration:%s\n",
                av_ts2timestr(blackdetect->black_end,   &inlink->time_base),
                av_ts2timestr(blackdetect->black_end - blackdetect->black_start, &inlink->time_base));
     }
@@ -131,7 +137,7 @@ static int request_frame(AVFilterLink *outlink)
     if (ret == AVERROR_EOF && blackdetect->black_started) {
         // FIXME: black_end should be set to last_picref_pts + last_picref_duration
         blackdetect->black_end = blackdetect->last_picref_pts;
-        check_black_end(ctx);
+        check_black(ctx);
     }
     return ret;
 }
@@ -163,15 +169,17 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
         if (!blackdetect->black_started) {
             /* black starts here */
             blackdetect->black_started = 1;
+            blackdetect->black_match = 0;
             blackdetect->black_start = picref->pts;
             av_dict_set(&picref->metadata, "lavfi.black_start",
                 av_ts2timestr(blackdetect->black_start, &inlink->time_base), 0);
         }
+        check_black(ctx);
     } else if (blackdetect->black_started) {
         /* black ends here */
-        blackdetect->black_started = 0;
         blackdetect->black_end = picref->pts;
-        check_black_end(ctx);
+        check_black(ctx);
+        blackdetect->black_started = 0;
         av_dict_set(&picref->metadata, "lavfi.black_end",
             av_ts2timestr(blackdetect->black_end, &inlink->time_base), 0);
     }
--
2.15.1