avdevice/decklink_enc: add support to specify field order

Signed-off-by: Marton Balint <cus@passwd.hu>

1 files changed, 23 insertions, 6 deletions

diff --git a/libavdevice/decklink_common.cpp b/libavdevice/decklink_common.cpp
index a3bc58dd6a..8b499c5640 100644
--- a/libavdevice/decklink_common.cpp
+++ b/libavdevice/decklink_common.cpp
@@ -130,9 +130,23 @@ static int decklink_select_input(AVFormatContext *avctx, BMDDeckLinkConfiguratio
     return 0;
 }
 
+static DECKLINK_BOOL field_order_eq(enum AVFieldOrder field_order, BMDFieldDominance bmd_field_order)
+{
+    if (field_order == AV_FIELD_UNKNOWN)
+        return true;
+    if ((field_order == AV_FIELD_TT || field_order == AV_FIELD_TB) && bmd_field_order == bmdUpperFieldFirst)
+        return true;
+    if ((field_order == AV_FIELD_BB || field_order == AV_FIELD_BT) && bmd_field_order == bmdLowerFieldFirst)
+        return true;
+    if (field_order == AV_FIELD_PROGRESSIVE && (bmd_field_order == bmdProgressiveFrame || bmd_field_order == bmdProgressiveSegmentedFrame))
+        return true;
+    return false;
+}
+
 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, int num)
 {
     struct decklink_cctx *cctx = (struct decklink_cctx *)avctx->priv_data;
@@ -143,8 +157,8 @@ int ff_decklink_set_format(AVFormatContext *avctx,
     int i = 1;
     HRESULT res;
 
-    av_log(avctx, AV_LOG_DEBUG, "Trying to find mode for frame size %dx%d, frame timing %d/%d, direction %d, mode number %d\n",
-        width, height, tb_num, tb_den, direction, num);
+    av_log(avctx, AV_LOG_DEBUG, "Trying to find mode for frame size %dx%d, frame timing %d/%d, field order %d, direction %d, mode number %d\n",
+        width, height, tb_num, tb_den, field_order, direction, num);
 
     if (ctx->duplex_mode) {
         DECKLINK_BOOL duplex_supported = false;
@@ -187,18 +201,21 @@ int ff_decklink_set_format(AVFormatContext *avctx,
         BMDTimeValue bmd_tb_num, bmd_tb_den;
         int bmd_width  = mode->GetWidth();
         int bmd_height = mode->GetHeight();
+        BMDFieldDominance bmd_field_dominance = mode->GetFieldDominance();
 
         mode->GetFrameRate(&bmd_tb_num, &bmd_tb_den);
         AVRational mode_tb = av_make_q(bmd_tb_num, bmd_tb_den);
 
-        if ((bmd_width == width && bmd_height == height &&
-            !av_cmp_q(mode_tb, target_tb)) || i == num) {
+        if ((bmd_width == width &&
+             bmd_height == height &&
+             !av_cmp_q(mode_tb, target_tb) &&
+             field_order_eq(field_order, bmd_field_dominance)) || i == num) {
             ctx->bmd_mode   = mode->GetDisplayMode();
             ctx->bmd_width  = bmd_width;
             ctx->bmd_height = bmd_height;
             ctx->bmd_tb_den = bmd_tb_den;
             ctx->bmd_tb_num = bmd_tb_num;
-            ctx->bmd_field_dominance = mode->GetFieldDominance();
+            ctx->bmd_field_dominance = bmd_field_dominance;
             av_log(avctx, AV_LOG_INFO, "Found Decklink mode %d x %d with rate %.2f%s\n",
                 bmd_width, bmd_height, 1/av_q2d(mode_tb),
                 (ctx->bmd_field_dominance==bmdLowerFieldFirst || ctx->bmd_field_dominance==bmdUpperFieldFirst)?"(i)":"");
@@ -230,7 +247,7 @@ int ff_decklink_set_format(AVFormatContext *avctx,
 }
 
 int ff_decklink_set_format(AVFormatContext *avctx, decklink_direction_t direction, int num) {
-    return ff_decklink_set_format(avctx, 0, 0, 0, 0, direction, num);
+    return ff_decklink_set_format(avctx, 0, 0, 0, 0, AV_FIELD_UNKNOWN, direction, num);
 }
 
 int ff_decklink_list_devices(AVFormatContext *avctx)