avopt: Explicitly store rational option defaults in .dbl

Signed-off-by: Martin Storsjö <martin@martin.st>

libavfilter/buffersrc.c

@@ -192,7 +192,7 @@ static av_cold int init_video(AVFilterContext *ctx, const char *args)
 #define OFFSET(x) offsetof(BufferSourceContext, x)
 #define A AV_OPT_FLAG_AUDIO_PARAM
 static const AVOption audio_options[] = {
-    { "time_base",      NULL, OFFSET(time_base),           AV_OPT_TYPE_RATIONAL, { 0 }, 0, INT_MAX, A },
+    { "time_base",      NULL, OFFSET(time_base),           AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, A },
     { "sample_rate",    NULL, OFFSET(sample_rate),         AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, A },
     { "sample_fmt",     NULL, OFFSET(sample_fmt_str),      AV_OPT_TYPE_STRING,             .flags = A },
     { "channel_layout", NULL, OFFSET(channel_layout_str),  AV_OPT_TYPE_STRING,             .flags = A },

libavfilter/vsrc_testsrc.c

@@ -67,7 +67,7 @@ static const AVOption testsrc_options[] = {
     { "rate",     "set video rate",     OFFSET(rate),     AV_OPT_TYPE_STRING, {.str = "25"},    },
     { "r",        "set video rate",     OFFSET(rate),     AV_OPT_TYPE_STRING, {.str = "25"},    },
     { "duration", "set video duration", OFFSET(duration), AV_OPT_TYPE_STRING, {.str = NULL},    },
-    { "sar",      "set video sample aspect ratio", OFFSET(sar), AV_OPT_TYPE_RATIONAL, {1},  0, INT_MAX },
+    { "sar",      "set video sample aspect ratio", OFFSET(sar), AV_OPT_TYPE_RATIONAL, {.dbl = 1},  0, INT_MAX },
     { NULL },
 };
 

libavutil/opt.c

@@ -853,7 +853,7 @@ typedef struct TestContext
 static const AVOption test_options[]= {
 {"num",      "set num",        OFFSET(num),      AV_OPT_TYPE_INT,      {.i64 = 0},       0,        100                 },
 {"toggle",   "set toggle",     OFFSET(toggle),   AV_OPT_TYPE_INT,      {.i64 = 0},       0,        1                   },
-{"rational", "set rational",   OFFSET(rational), AV_OPT_TYPE_RATIONAL, {0},              0,        10                  },
+{"rational", "set rational",   OFFSET(rational), AV_OPT_TYPE_RATIONAL, {.dbl = 0},  0,        10                  },
 {"string",   "set string",     OFFSET(string),   AV_OPT_TYPE_STRING,   {0},              CHAR_MIN, CHAR_MAX            },
 {"flags",    "set flags",      OFFSET(flags),    AV_OPT_TYPE_FLAGS,    {.i64 = 0},       0,        INT_MAX, 0, "flags" },
 {"cool",     "set cool flag ", 0,                AV_OPT_TYPE_CONST,    {.i64 = TEST_FLAG_COOL}, INT_MIN,  INT_MAX, 0, "flags" },