avdevice/decklink: add link configuration option

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

doc/outdevs.texi

@@ -205,6 +205,12 @@ Defaults to @samp{unset}.
 Sets the genlock timing pixel offset on the used output.
 Defaults to @samp{unset}.
 
+@item link
+Sets the SDI video link configuration on the used output. Must be
+@samp{unset}, @samp{single} link SDI, @samp{dual} link SDI or @samp{quad} link
+SDI.
+Defaults to @samp{unset}.
+
 @end table
 
 @subsection Examples

libavdevice/decklink_common.cpp

@@ -214,6 +214,15 @@ int ff_decklink_set_configs(AVFormatContext *avctx,
         if (res != S_OK)
             av_log(avctx, AV_LOG_WARNING, "Setting timing offset failed.\n");
     }
+
+    if (direction == DIRECTION_OUT && ctx->link > 0) {
+        res = ctx->cfg->SetInt(bmdDeckLinkConfigSDIOutputLinkConfiguration, ctx->link);
+        if (res != S_OK)
+            av_log(avctx, AV_LOG_WARNING, "Setting link configuration failed.\n");
+        else
+            av_log(avctx, AV_LOG_VERBOSE, "Successfully set link configuration: 0x%x.\n", ctx->link);
+    }
+
     return 0;
 }
 

libavdevice/decklink_common.h

@@ -131,6 +131,7 @@ struct decklink_ctx {
     int64_t teletext_lines;
     double preroll;
     int duplex_mode;
+    BMDLinkConfiguration link;
     DecklinkPtsSource audio_pts_source;
     DecklinkPtsSource video_pts_source;
     int draw_bars;
@@ -200,6 +201,13 @@ static const BMDTimecodeFormat decklink_timecode_format_map[] = {
 #endif
 };
 
+static const BMDLinkConfiguration decklink_link_conf_map[] = {
+    (BMDLinkConfiguration)0,
+    bmdLinkConfigurationSingleLink,
+    bmdLinkConfigurationDualLink,
+    bmdLinkConfigurationQuadLink
+};
+
 int ff_decklink_set_configs(AVFormatContext *avctx, decklink_direction_t direction);
 int ff_decklink_set_format(AVFormatContext *avctx, int width, int height, int tb_num, int tb_den, enum AVFieldOrder field_order, decklink_direction_t direction = DIRECTION_OUT);
 int ff_decklink_set_format(AVFormatContext *avctx, decklink_direction_t direction);

libavdevice/decklink_common_c.h

@@ -48,6 +48,7 @@ struct decklink_cctx {
     int audio_channels;
     int audio_depth;
     int duplex_mode;
+    int link;
     DecklinkPtsSource audio_pts_source;
     DecklinkPtsSource video_pts_source;
     int audio_input;

libavdevice/decklink_enc.cpp

@@ -559,6 +559,8 @@ av_cold int ff_decklink_write_header(AVFormatContext *avctx)
     ctx->list_formats = cctx->list_formats;
     ctx->preroll      = cctx->preroll;
     ctx->duplex_mode  = cctx->duplex_mode;
+    if (cctx->link > 0 && (unsigned int)cctx->link < FF_ARRAY_ELEMS(decklink_link_conf_map))
+        ctx->link = decklink_link_conf_map[cctx->link];
     cctx->ctx = ctx;
 #if CONFIG_LIBKLVANC
     if (klvanc_context_create(&ctx->vanc_ctx) < 0) {

libavdevice/decklink_enc_c.c

@@ -35,6 +35,11 @@ static const AVOption options[] = {
     { "unset"       ,  NULL                     , 0                   , AV_OPT_TYPE_CONST , { .i64 = 0   }, 0, 0, ENC, "duplex_mode"},
     { "half"        ,  NULL                     , 0                   , AV_OPT_TYPE_CONST , { .i64 = 1   }, 0, 0, ENC, "duplex_mode"},
     { "full"        ,  NULL                     , 0                   , AV_OPT_TYPE_CONST , { .i64 = 2   }, 0, 0, ENC, "duplex_mode"},
+    { "link" ,         "single/dual/quad SDI link configuration", OFFSET(link), AV_OPT_TYPE_INT, { .i64 = 0   }, 0, 3, ENC, "link"},
+    { "unset"       ,  NULL                     , 0                   , AV_OPT_TYPE_CONST , { .i64 = 0   }, 0, 0, ENC, "link"},
+    { "single"      ,  NULL                     , 0                   , AV_OPT_TYPE_CONST , { .i64 = 1   }, 0, 0, ENC, "link"},
+    { "dual"        ,  NULL                     , 0                   , AV_OPT_TYPE_CONST , { .i64 = 2   }, 0, 0, ENC, "link"},
+    { "quad"        ,  NULL                     , 0                   , AV_OPT_TYPE_CONST , { .i64 = 3   }, 0, 0, ENC, "link"},
     { "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 },