cmdutils: implement FFREPORT=level=...

Fixes Ticket3057
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

cmdutils.c

@@ -66,6 +66,7 @@ AVDictionary *swr_opts;
 AVDictionary *format_opts, *codec_opts, *resample_opts;
 
 static FILE *report_file;
+static int report_file_level = AV_LOG_DEBUG;
 int hide_banner = 0;
 
 void init_opts(void)
@@ -104,8 +105,10 @@ static void log_callback_report(void *ptr, int level, const char *fmt, va_list v
     av_log_default_callback(ptr, level, fmt, vl);
     av_log_format_line(ptr, level, fmt, vl2, line, sizeof(line), &print_prefix);
     va_end(vl2);
-    fputs(line, report_file);
-    fflush(report_file);
+    if (report_file_level >= level) {
+        fputs(line, report_file);
+        fflush(report_file);
+    }
 }
 
 static void (*program_exit)(int ret);
@@ -926,6 +929,13 @@ static int init_report(const char *env)
             av_free(filename_template);
             filename_template = val;
             val = NULL;
+        } else if (!strcmp(key, "level")) {
+            char *tail;
+            report_file_level = strtol(val, &tail, 10);
+            if (*tail) {
+                av_log(NULL, AV_LOG_FATAL, "Invalid report file level\n");
+                exit_program(1);
+            }
         } else {
             av_log(NULL, AV_LOG_ERROR, "Unknown key '%s' in FFREPORT\n", key);
         }

doc/fftools-common-opts.texi

@@ -189,6 +189,8 @@ following option is recognized:
 set the file name to use for the report; @code{%p} is expanded to the name
 of the program, @code{%t} is expanded to a timestamp, @code{%%} is expanded
 to a plain @code{%}
+@item level
+set the log level
 @end table
 
 Errors in parsing the environment variable are not fatal, and will not