lavu/opt: enhance printing durations.

Trim unneeded leading components and trailing zeros.
Move the formating code in a separate function.
Use the function also to format the default value, it was currently
printed as plain integer, inconsistent to the way it is parsed.

libavutil/opt.c

@@ -26,6 +26,7 @@
  */
 
 #include "avutil.h"
+#include "avassert.h"
 #include "avstring.h"
 #include "channel_layout.h"
 #include "common.h"
@@ -639,6 +640,41 @@ int av_opt_set_dict_val(void *obj, const char *name, const AVDictionary *val, in
     return 0;
 }
 
+static void format_duration(char *buf, size_t size, int64_t d)
+{
+    char *e;
+
+    av_assert0(size >= 25);
+    if (d < 0 && d != INT64_MIN) {
+        *(buf++) = '-';
+        size--;
+        d = -d;
+    }
+    if (d == INT64_MAX)
+        snprintf(buf, size, "INT64_MAX");
+    else if (d == INT64_MIN)
+        snprintf(buf, size, "INT64_MIN");
+    else if (d > (int64_t)3600*1000000)
+        snprintf(buf, size, "%"PRId64":%02d:%02d.%06d", d / 3600000000,
+                 (int)((d / 60000000) % 60),
+                 (int)((d / 1000000) % 60),
+                 (int)(d % 1000000));
+    else if (d > 60*1000000)
+        snprintf(buf, size, "%d:%02d.%06d",
+                 (int)(d / 60000000),
+                 (int)((d / 1000000) % 60),
+                 (int)(d % 1000000));
+    else
+        snprintf(buf, size, "%d.%06d",
+                 (int)(d / 1000000),
+                 (int)(d % 1000000));
+    e = buf + strlen(buf);
+    while (e > buf && e[-1] == '0')
+        *(--e) = 0;
+    if (e > buf && e[-1] == '.')
+        *(--e) = 0;
+}
+
 int av_opt_get(void *obj, const char *name, int search_flags, uint8_t **out_val)
 {
     void *dst, *target_obj;
@@ -704,9 +740,8 @@ int av_opt_get(void *obj, const char *name, int search_flags, uint8_t **out_val)
         break;
     case AV_OPT_TYPE_DURATION:
         i64 = *(int64_t *)dst;
-        ret = snprintf(buf, sizeof(buf), "%"PRIi64":%02d:%02d.%06d",
-                       i64 / 3600000000, (int)((i64 / 60000000) % 60),
-                       (int)((i64 / 1000000) % 60), (int)(i64 % 1000000));
+        format_duration(buf, sizeof(buf), i64);
+        ret = strlen(buf); // no overflow possible, checked by an assert
         break;
     case AV_OPT_TYPE_COLOR:
         ret = snprintf(buf, sizeof(buf), "0x%02x%02x%02x%02x",
@@ -1097,9 +1132,12 @@ static void opt_list(void *obj, void *av_log_obj, const char *unit,
                 }
                 break;
             }
-            case AV_OPT_TYPE_DURATION:
-                log_value(av_log_obj, AV_LOG_INFO, opt->default_val.i64);
+            case AV_OPT_TYPE_DURATION: {
+                char buf[25];
+                format_duration(buf, sizeof(buf), opt->default_val.i64);
+                av_log(av_log_obj, AV_LOG_INFO, "%s", buf);
                 break;
+            }
             case AV_OPT_TYPE_INT:
             case AV_OPT_TYPE_INT64: {
                 const char *def_const = get_opt_const_name(obj, opt->unit, opt->default_val.i64);

tests/ref/fate/opt

@@ -31,7 +31,7 @@ TestContext AVOptions:
   -pix_fmt           <pix_fmt>    E....... set pixfmt (default 0bgr)
   -sample_fmt        <sample_fmt> E....... set samplefmt (default s16)
   -video_rate        <video_rate> E....... set videorate (default "25")
-  -duration          <duration>   E....... set duration (default 1000)
+  -duration          <duration>   E....... set duration (default 0.001)
   -color             <color>      E....... set color (default "pink")
   -cl                <channel_layout> E....... set channel layout (default 0x137)
   -bin               <binary>     E....... set binary value
@@ -97,7 +97,7 @@ name:     bool2 default:1 error:
 name:     bool3 default:1 error:
 
 Test av_opt_serialize()
-num=0,toggle=1,rational=1/1,string=default,escape=\\\=\,,flags=0x00000001,size=200x300,pix_fmt=0bgr,sample_fmt=s16,video_rate=25/1,duration=0:00:00.001000,color=0xffc0cbff,cl=0x137,bin=62696E00,bin1=,bin2=,num64=1,flt=0.333333,dbl=0.333333,bool1=auto,bool2=true,bool3=false
+num=0,toggle=1,rational=1/1,string=default,escape=\\\=\,,flags=0x00000001,size=200x300,pix_fmt=0bgr,sample_fmt=s16,video_rate=25/1,duration=0.001,color=0xffc0cbff,cl=0x137,bin=62696E00,bin1=,bin2=,num64=1,flt=0.333333,dbl=0.333333,bool1=auto,bool2=true,bool3=false
 Setting entry with key 'num' to value '0'
 Setting entry with key 'toggle' to value '1'
 Setting entry with key 'rational' to value '1/1'
@@ -108,7 +108,7 @@ Setting entry with key 'size' to value '200x300'
 Setting entry with key 'pix_fmt' to value '0bgr'
 Setting entry with key 'sample_fmt' to value 's16'
 Setting entry with key 'video_rate' to value '25/1'
-Setting entry with key 'duration' to value '0:00:00.001000'
+Setting entry with key 'duration' to value '0.001'
 Setting entry with key 'color' to value '0xffc0cbff'
 Setting entry with key 'cl' to value '0x137'
 Setting entry with key 'bin' to value '62696E00'
@@ -120,7 +120,7 @@ Setting entry with key 'dbl' to value '0.333333'
 Setting entry with key 'bool1' to value 'auto'
 Setting entry with key 'bool2' to value 'true'
 Setting entry with key 'bool3' to value 'false'
-num=0,toggle=1,rational=1/1,string=default,escape=\\\=\,,flags=0x00000001,size=200x300,pix_fmt=0bgr,sample_fmt=s16,video_rate=25/1,duration=0:00:00.001000,color=0xffc0cbff,cl=0x137,bin=62696E00,bin1=,bin2=,num64=1,flt=0.333333,dbl=0.333333,bool1=auto,bool2=true,bool3=false
+num=0,toggle=1,rational=1/1,string=default,escape=\\\=\,,flags=0x00000001,size=200x300,pix_fmt=0bgr,sample_fmt=s16,video_rate=25/1,duration=0.001,color=0xffc0cbff,cl=0x137,bin=62696E00,bin1=,bin2=,num64=1,flt=0.333333,dbl=0.333333,bool1=auto,bool2=true,bool3=false
 
 Testing av_set_options_string()
 Setting options string ''