avdevice/decklink: add support for setting duplex mode

This patch also makes BlackMagic drivers v10.6.1 a hard requirement.
Reviewed-by: Deti Fliegl <deti@fliegl.de>
Signed-off-by: Marton Balint <cus@passwd.hu>

configure

@@ -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

doc/indevs.texi

@@ -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

libavdevice/decklink_common.cpp

@@ -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;
 }

libavdevice/decklink_common.h

@@ -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;

libavdevice/decklink_common_c.h

@@ -34,6 +34,7 @@ struct decklink_cctx {
     double preroll;
     int v210;
     int audio_channels;
+    int duplex_mode;
 };
 
 #endif /* AVDEVICE_DECKLINK_COMMON_C_H */

libavdevice/decklink_dec.cpp

@@ -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

libavdevice/decklink_dec_c.c

@@ -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 },
 };