@@ -5625,7 +5625,8 @@ enabled cuvid             && { check_lib cuviddec.h cuvidCreateDecoder -lnvcuvid

 enabled chromaprint       && require chromaprint chromaprint.h chromaprint_get_version -lchromaprint

 enabled coreimage_filter  && { check_header_objcc QuartzCore/CoreImage.h || disable coreimage_filter; }

 enabled coreimagesrc_filter && { check_header_objcc QuartzCore/CoreImage.h || disable coreimagesrc_filter; }

-enabled decklink          && { check_header DeckLinkAPI.h || die "ERROR: DeckLinkAPI.h header not found"; }

+enabled decklink          && { { check_header DeckLinkAPI.h || die "ERROR: DeckLinkAPI.h header not found"; } &&

+                               { check_cpp_condition DeckLinkAPIVersion.h "BLACKMAGIC_DECKLINK_API_VERSION >= 0x0a060100" || die "ERROR: Decklink API version must be >= 10.6.1."; } }

 enabled frei0r            && { check_header frei0r.h || die "ERROR: frei0r.h header not found"; }

 enabled gmp               && require2 gmp gmp.h mpz_export -lgmp

 enabled gnutls            && require_pkg_config gnutls gnutls/gnutls.h gnutls_global_init

@@ -251,6 +251,10 @@ To use this option, ffmpeg needs to be compiled with @code{--enable-libzvbi}.

 Defines number of audio channels to capture. Must be @samp{2}, @samp{8} or @samp{16}.

 Defaults to @samp{2}.

+@item duplex_mode

+Sets the decklink device duplex mode. Must be @samp{unset}, @samp{half} or @samp{full}.

+Defaults to @samp{unset}.

+

 @end table

 @subsection Examples

@@ -111,6 +111,23 @@ int ff_decklink_set_format(AVFormatContext *avctx,

     int i = 1;

     HRESULT res;

+    if (ctx->duplex_mode) {

+        bool duplex_supported = false;

+

+        if (ctx->attr->GetFlag(BMDDeckLinkSupportsDuplexModeConfiguration, &duplex_supported) != S_OK)

+            duplex_supported = false;

+

+        if (duplex_supported) {

+            res = ctx->cfg->SetInt(bmdDeckLinkConfigDuplexMode, ctx->duplex_mode == 2 ? bmdDuplexModeFull : bmdDuplexModeHalf);

+            if (res != S_OK)

+                av_log(avctx, AV_LOG_WARNING, "Setting duplex mode failed.\n");

+            else

+                av_log(avctx, AV_LOG_VERBOSE, "Succesfully set duplex mode to %s duplex.\n", ctx->duplex_mode == 2 ? "full" : "half");

+        } else {

+            av_log(avctx, AV_LOG_WARNING, "Unable to set duplex mode, because it is not supported.\n");

+        }

+    }

+

     if (direction == DIRECTION_IN) {

         res = ctx->dli->GetDisplayModeIterator (&itermode);

     } else {

@@ -249,6 +266,10 @@ void ff_decklink_cleanup(AVFormatContext *avctx)

         ctx->dli->Release();

     if (ctx->dlo)

         ctx->dlo->Release();

+    if (ctx->attr)

+        ctx->attr->Release();

+    if (ctx->cfg)

+        ctx->cfg->Release();

     if (ctx->dl)

         ctx->dl->Release();

 }

@@ -279,5 +300,17 @@ int ff_decklink_init_device(AVFormatContext *avctx, const char* name)

     if (!ctx->dl)

         return AVERROR(ENXIO);

+    if (ctx->dl->QueryInterface(IID_IDeckLinkConfiguration, (void **)&ctx->cfg) != S_OK) {

+        av_log(avctx, AV_LOG_ERROR, "Could not get configuration interface for '%s'\n", name);

+        ff_decklink_cleanup(avctx);

+        return AVERROR_EXTERNAL;

+    }

+

+    if (ctx->dl->QueryInterface(IID_IDeckLinkAttributes, (void **)&ctx->attr) != S_OK) {

+        av_log(avctx, AV_LOG_ERROR, "Could not get attributes interface for '%s'\n", name);

+        ff_decklink_cleanup(avctx);

+        return AVERROR_EXTERNAL;

+    }

+

     return 0;

 }

@@ -44,6 +44,8 @@ struct decklink_ctx {

     IDeckLink *dl;

     IDeckLinkOutput *dlo;

     IDeckLinkInput *dli;

+    IDeckLinkConfiguration *cfg;

+    IDeckLinkAttributes *attr;

     decklink_output_callback *output_callback;

     decklink_input_callback *input_callback;

@@ -77,6 +79,7 @@ struct decklink_ctx {

     int list_formats;

     int64_t teletext_lines;

     double preroll;

+    int duplex_mode;

     int frames_preroll;

     int frames_buffer;

@@ -34,6 +34,7 @@ struct decklink_cctx {

     double preroll;

     int v210;

     int audio_channels;

+    int duplex_mode;

 };

 #endif /* AVDEVICE_DECKLINK_COMMON_C_H */

@@ -445,6 +445,7 @@ av_cold int ff_decklink_read_header(AVFormatContext *avctx)

     ctx->list_formats = cctx->list_formats;

     ctx->teletext_lines = cctx->teletext_lines;

     ctx->preroll      = cctx->preroll;

+    ctx->duplex_mode  = cctx->duplex_mode;

     cctx->ctx = ctx;

 #if !CONFIG_LIBZVBI

@@ -36,6 +36,10 @@ static const AVOption options[] = {

     { "standard",     NULL,                                           0,  AV_OPT_TYPE_CONST, { .i64 = 0x7fff9fffeLL}, 0, 0,    DEC, "teletext_lines"},

     { "all",          NULL,                                           0,  AV_OPT_TYPE_CONST, { .i64 = 0x7ffffffffLL}, 0, 0,    DEC, "teletext_lines"},

     { "channels",     "number of audio channels", OFFSET(audio_channels), AV_OPT_TYPE_INT , { .i64 = 2   }, 2, 16, DEC },

+    { "duplex_mode",  "duplex mode",              OFFSET(duplex_mode),    AV_OPT_TYPE_INT,   { .i64 = 0}, 0, 2,    DEC, "duplex_mode"},

+    { "unset",         NULL,                                          0,  AV_OPT_TYPE_CONST, { .i64 = 0}, 0, 0,    DEC, "duplex_mode"},

+    { "half",          NULL,                                          0,  AV_OPT_TYPE_CONST, { .i64 = 1}, 0, 0,    DEC, "duplex_mode"},

+    { "full",          NULL,                                          0,  AV_OPT_TYPE_CONST, { .i64 = 2}, 0, 0,    DEC, "duplex_mode"},

     { NULL },

 };