avdevice/decklink: add level_a configuration option

Reviewed-by: Marton Balint <cus@passwd.hu>
Signed-off-by: Limin Wang <lance.lmwang@gmail.com>

doc/outdevs.texi

@@ -216,6 +216,11 @@ Enable Square Division Quad Split mode for Quad-link SDI output.
 Must be @samp{unset}, @samp{true} or @samp{false}.
 Defaults to @option{unset}.
 
+@item level_a
+Enable SMPTE Level A mode on the used output.
+Must be @samp{unset}, @samp{true} or @samp{false}.
+Defaults to @option{unset}.
+
 @end table
 
 @subsection Examples

libavdevice/decklink_common.cpp

@@ -230,6 +230,23 @@ int ff_decklink_set_configs(AVFormatContext *avctx,
         }
     }
 
+    if (direction == DIRECTION_OUT && cctx->level_a >= 0) {
+        DECKLINK_BOOL level_a_supported = false;
+
+        if (ctx->attr->GetFlag(BMDDeckLinkSupportsSMPTELevelAOutput, &level_a_supported) != S_OK)
+            level_a_supported = false;
+
+        if (level_a_supported) {
+            res = ctx->cfg->SetFlag(bmdDeckLinkConfigSMPTELevelAOutput, cctx->level_a);
+            if (res != S_OK)
+                av_log(avctx, AV_LOG_WARNING, "Setting SMPTE levelA failed.\n");
+            else
+                av_log(avctx, AV_LOG_VERBOSE, "Successfully set SMPTE levelA.\n");
+        } else {
+            av_log(avctx, AV_LOG_WARNING, "Unable to set SMPTE levelA mode, because it is not supported.\n");
+        }
+    }
+
     return 0;
 }
 

libavdevice/decklink_common_c.h

@@ -50,6 +50,7 @@ struct decklink_cctx {
     int duplex_mode;
     int link;
     int sqd;
+    int level_a;
     DecklinkPtsSource audio_pts_source;
     DecklinkPtsSource video_pts_source;
     int audio_input;

libavdevice/decklink_enc_c.c

@@ -44,6 +44,10 @@ static const AVOption options[] = {
     { "unset"       ,  NULL                     , 0                   , AV_OPT_TYPE_CONST , { .i64 = -1  }, 0, 0, ENC, "sqd"},
     { "false"       ,  NULL                     , 0                   , AV_OPT_TYPE_CONST , { .i64 = 0   }, 0, 0, ENC, "sqd"},
     { "true"        ,  NULL                     , 0                   , AV_OPT_TYPE_CONST , { .i64 = 1   }, 0, 0, ENC, "sqd"},
+    { "level_a"     , "set SMPTE LevelA"        , OFFSET(level_a)     , AV_OPT_TYPE_INT,    { .i64 = -1  }, -1,1, ENC, "level_a"},
+    { "unset"       ,  NULL                     , 0                   , AV_OPT_TYPE_CONST , { .i64 = -1  }, 0, 0, ENC, "level_a"},
+    { "false"       ,  NULL                     , 0                   , AV_OPT_TYPE_CONST , { .i64 = 0   }, 0, 0, ENC, "level_a"},
+    { "true"        ,  NULL                     , 0                   , AV_OPT_TYPE_CONST , { .i64 = 1   }, 0, 0, ENC, "level_a"},
     { "timing_offset", "genlock timing pixel offset", OFFSET(timing_offset), AV_OPT_TYPE_INT,   { .i64 = INT_MIN }, INT_MIN, INT_MAX, ENC, "timing_offset"},
     { "unset"       ,  NULL                     , 0                        , AV_OPT_TYPE_CONST, { .i64 = INT_MIN },       0,       0, ENC, "timing_offset"},
     { NULL },