[FFmpeg-devel] [PATCH] Add max value output option to psnr stats log.

[Lucas Cooper]

This allows retroactive calculation/aggregation of PSNR from the stats
log.
---
 libavfilter/vf_psnr.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/libavfilter/vf_psnr.c b/libavfilter/vf_psnr.c
index 3bec747..de5cc8f 100644
--- a/libavfilter/vf_psnr.c
+++ b/libavfilter/vf_psnr.c
@@ -45,6 +45,7 @@ typedef struct PSNRContext {
     char *stats_file_str;
     int stats_version;
     int stats_header_written;
+    int stats_add_max;
     int max[4], average_max;
     int is_rgb;
     uint8_t rgba_map[4];
@@ -63,6 +64,7 @@ static const AVOption psnr_options[] = {
     {"stats_file", "Set file where to store per-frame difference information", 
OFFSET(stats_file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
     {"f",          "Set file where to store per-frame difference information", 
OFFSET(stats_file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
     {"stats_version", "Set the format version for the stats file.",            
   OFFSET(stats_version),  AV_OPT_TYPE_INT,    {.i64=1},    1, 2, FLAGS },
+    {"output_max",  "Add raw stats (max values) to the output log.",           
 OFFSET(stats_add_max), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
     { NULL }
 };
 
@@ -182,6 +184,12 @@ static AVFrame *do_psnr(AVFilterContext *ctx, AVFrame 
*main,
             for (j = 0; j < s->nb_components; j++) {
                 fprintf(s->stats_file, ",psnr_%c", s->comps[j]);
             }
+            if (s->stats_add_max) {
+              fprintf(s->stats_file, ",max_avg");
+              for (j = 0; j < s->nb_components; j++) {
+                  fprintf(s->stats_file, ",max_%c", s->comps[j]);
+              }
+            }
             fprintf(s->stats_file, "\n");
             s->stats_header_written = 1;
         }
@@ -196,6 +204,13 @@ static AVFrame *do_psnr(AVFilterContext *ctx, AVFrame 
*main,
             fprintf(s->stats_file, "psnr_%c:%0.2f ", s->comps[j],
                     get_psnr(comp_mse[c], 1, s->max[c]));
         }
+        if (s->stats_version == 2 && s->stats_add_max) {
+          fprintf(s->stats_file, "max_avg:%d ", s->average_max);
+          for (j = 0; j < s->nb_components; j++) {
+              c = s->is_rgb ? s->rgba_map[j] : j;
+              fprintf(s->stats_file, "max_%c:%d ", s->comps[j], s->max[c]);
+          }
+        }
         fprintf(s->stats_file, "\n");
     }
 
-- 
2.8.0.rc3.226.g39d4020

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