[FFmpeg-devel] [PATCH] avfilter/buffersrc: limit link variance logs below debug loglevel

[Gyan Doshi <ffmpeg@gyani.pro>]

The video param change check will print loglines below debug level
for each frame which is different from the inlink parameters. This
can spam the console. It is now printed at warning level once for
each param change else it is kept at debug level.

Partially addresses #10823
---
 libavfilter/buffersrc.c | 40 +++++++++++++++++++++++++++-------------
 1 file changed, 27 insertions(+), 13 deletions(-)

diff --git a/libavfilter/buffersrc.c b/libavfilter/buffersrc.c
index afe69433b2..6e450ff6b7 100644
--- a/libavfilter/buffersrc.c
+++ b/libavfilter/buffersrc.c
@@ -49,10 +49,10 @@ typedef struct BufferSourceContext {
     unsigned          nb_failed_requests;
 
     /* video only */
-    int               w, h;
-    enum AVPixelFormat  pix_fmt;
-    enum AVColorSpace color_space;
-    enum AVColorRange color_range;
+    int               w, h, prev_w, prev_h;
+    enum AVPixelFormat  pix_fmt, prev_pix_fmt;
+    enum AVColorSpace color_space, prev_color_space;
+    enum AVColorRange color_range, prev_color_range;
     AVRational        pixel_aspect;
 
     AVBufferRef *hw_frames_ctx;
@@ -66,16 +66,30 @@ typedef struct BufferSourceContext {
 
     int eof;
     int64_t last_pts;
+    int link_delta, prev_delta;
 } BufferSourceContext;
 
 #define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format, csp, range, pts)\
-    if (c->w != width || c->h != height || c->pix_fmt != format ||\
-        c->color_space != csp || c->color_range != range) {\
-        av_log(s, AV_LOG_INFO, "filter context - w: %d h: %d fmt: %d csp: %s range: %s, incoming frame - w: %d h: %d fmt: %d csp: %s range: %s pts_time: %s\n",\
+    c->link_delta = c->w != width || c->h != height || c->pix_fmt != format ||\
+                    c->color_space != csp || c->color_range != range;\
+    c->prev_delta = c->prev_w != width || c->prev_h != height || c->prev_pix_fmt != format ||\
+                    c->prev_color_space != csp || c->prev_color_range != range;\
+    if (c->link_delta) {\
+        int loglevel = c->prev_delta ? AV_LOG_WARNING : AV_LOG_DEBUG;\
+        av_log(s, loglevel, "Changing video frame properties on the fly is not supported by all filters.\n");\
+        av_log(s, loglevel, "filter context - w: %d h: %d fmt: %d csp: %s range: %s, incoming frame - w: %d h: %d fmt: %d csp: %s range: %s pts_time: %s\n",\
                c->w, c->h, c->pix_fmt, av_color_space_name(c->color_space), av_color_range_name(c->color_range),\
                width, height, format, av_color_space_name(csp), av_color_range_name(range),\
                av_ts2timestr(pts, &s->outputs[0]->time_base));\
-        av_log(s, AV_LOG_WARNING, "Changing video frame properties on the fly is not supported by all filters.\n");\
+    }\
+    if (c->prev_delta) {\
+        if (!c->link_delta)\
+            av_log(s, AV_LOG_VERBOSE, "video frame properties congruent with link at pts_time: %s\n", av_ts2timestr(pts, &s->outputs[0]->time_base));\
+        c->prev_w = width;\
+        c->prev_h = height;\
+        c->prev_pix_fmt = format;\
+        c->prev_color_space = csp;\
+        c->prev_color_range = range;\
     }
 
 #define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, layout, format, pts)\
@@ -111,12 +125,12 @@ int av_buffersrc_parameters_set(AVFilterContext *ctx, AVBufferSrcParameters *par
     switch (ctx->filter->outputs[0].type) {
     case AVMEDIA_TYPE_VIDEO:
         if (param->format != AV_PIX_FMT_NONE) {
-            s->pix_fmt = param->format;
+            s->pix_fmt = s->prev_pix_fmt = param->format;
         }
         if (param->width > 0)
-            s->w = param->width;
+            s->w = s->prev_w = param->width;
         if (param->height > 0)
-            s->h = param->height;
+            s->h = s->prev_h = param->height;
         if (param->sample_aspect_ratio.num > 0 && param->sample_aspect_ratio.den > 0)
             s->pixel_aspect = param->sample_aspect_ratio;
         if (param->frame_rate.num > 0 && param->frame_rate.den > 0)
@@ -128,9 +142,9 @@ int av_buffersrc_parameters_set(AVFilterContext *ctx, AVBufferSrcParameters *par
                 return AVERROR(ENOMEM);
         }
         if (param->color_space != AVCOL_SPC_UNSPECIFIED)
-            s->color_space = param->color_space;
+            s->color_space = s->prev_color_space = param->color_space;
         if (param->color_range != AVCOL_RANGE_UNSPECIFIED)
-            s->color_range = param->color_range;
+            s->color_range = s->prev_color_range = param->color_range;
         break;
     case AVMEDIA_TYPE_AUDIO:
         if (param->format != AV_SAMPLE_FMT_NONE) {
-- 
2.39.1

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