Add new command line argument "-log_ms" which includes milliseconds

For debugging of high frequency events (e.g. decklink output), we want
a higher resolution timestamp on log events.  Add a command line
option which can be optionally enabled which includes the higher
precision.

fftools/cmdutils.c

@@ -78,6 +78,7 @@ static FILE *report_file;
 static int report_file_level = AV_LOG_DEBUG;
 int hide_banner = 0;
 char *log_filename = NULL;
+int log_ms = 0;
 
 enum show_muxdemuxers {
     SHOW_DEFAULT,
@@ -536,6 +537,9 @@ void parse_loglevel(int argc, char **argv, const OptionDef *options)
     idx = locate_option(argc, argv, options, "logfile");
     if (idx && argv[idx + 1])
         log_filename = strdup(argv[idx + 1]);
+
+    if (locate_option(argc, argv, options, "log_ms"))
+        log_ms = 1;
 }
 
 static const AVOption *opt_find(void *obj, const char *name, const char *unit,

fftools/cmdutils.h

@@ -51,6 +51,7 @@ extern AVDictionary *swr_opts;
 extern AVDictionary *format_opts, *codec_opts, *resample_opts;
 extern int hide_banner;
 extern char *log_filename;
+extern int log_ms;
 
 /**
  * Register a program-specific cleanup routine.
@@ -236,6 +237,7 @@ void show_help_options(const OptionDef *options, const char *msg, int req_flags,
     { "sample_fmts", OPT_EXIT,             { .func_arg = show_sample_fmts }, "show available audio sample formats" },   \
     { "colors",      OPT_EXIT,             { .func_arg = show_colors },      "show available color names" },            \
     { "loglevel",    HAS_ARG,              { .func_arg = opt_loglevel },     "set logging level", "loglevel" },         \
+    { "log_ms",      OPT_BOOL | OPT_EXPERT, { &log_ms },        "show millisecond timestamps", "log_ms" }, \
     { "v",           HAS_ARG,              { .func_arg = opt_loglevel },     "set logging level", "loglevel" },         \
     { "report",      0,                    { (void*)opt_report },            "generate a report" },                     \
     { "max_alloc",   HAS_ARG,              { .func_arg = opt_max_alloc },    "set maximum size of a single allocated block", "bytes" }, \

fftools/ltndecoder.c

@@ -4978,9 +4978,17 @@ static void log_callback_ltn(void *ptr, int level, const char *fmt, va_list vl)
     ff_mutex_lock(&log_mutex);
     time(&now);
     timeinfo = localtime(&now);
-    if (print_prefix == 1)
-        strftime(line2, sizeof(line2), "%F %T ", timeinfo);
-    else
+
+    if (print_prefix == 1) {
+        if (log_ms == 1) {
+            char dt[64];
+            gettimeofday(&tv,NULL);
+            strftime(dt, sizeof(dt), "%F %T", timeinfo);
+            snprintf(line2, sizeof(line2), "%s (%d.%06d) ", dt, tv.tv_sec, tv.tv_usec);
+        } else {
+            strftime(line2, sizeof(line2), "%F %T ", timeinfo);
+        }
+    } else
         line2[0] = '\0';
 
     av_log_format_line(ptr, level, fmt, vl, line, sizeof(line), &print_prefix);