[FFmpeg-devel] [PATCH] cuvid: add drop_second_field as input option and enable it by default

[Miroslav Slugeň]

There is no need to copy second field if deinterlacing, it doesn't make 
sense to use two times same image.

--
Miroslav Slugeň











>From 73d8f9fa17c26125a5b03243284f67126c70d7a6 Mon Sep 17 00:00:00 2001
From: Miroslav Slugen <thunde...@email.cz>
Date: Sun, 12 Feb 2017 20:00:51 +0100
Subject: [PATCH 1/1] cuvid: add drop_second_field as input option and enable
 it by default

---
 libavcodec/cuvid.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/libavcodec/cuvid.c b/libavcodec/cuvid.c
index 9b35476..a2e125d 100644
--- a/libavcodec/cuvid.c
+++ b/libavcodec/cuvid.c
@@ -42,6 +42,7 @@ typedef struct CuvidContext
 
     char *cu_gpu;
     int nb_surfaces;
+    int drop_second_field;
 
     AVBufferRef *hwdevice;
     AVBufferRef *hwframe;
@@ -298,8 +299,10 @@ static int CUDAAPI cuvid_handle_picture_display(void *opaque, CUVIDPARSERDISPINF
     } else {
         parsed_frame.is_deinterlacing = 1;
         av_fifo_generic_write(ctx->frame_queue, &parsed_frame, sizeof(CuvidParsedFrame), NULL);
-        parsed_frame.second_field = 1;
-        av_fifo_generic_write(ctx->frame_queue, &parsed_frame, sizeof(CuvidParsedFrame), NULL);
+        if (!ctx->drop_second_field) {
+            parsed_frame.second_field = 1;
+            av_fifo_generic_write(ctx->frame_queue, &parsed_frame, sizeof(CuvidParsedFrame), NULL);
+        }
     }
 
     return 1;
@@ -930,6 +933,7 @@ static const AVOption options[] = {
     { "adaptive", "Adaptive deinterlacing",                  0, AV_OPT_TYPE_CONST, { .i64 = cudaVideoDeinterlaceMode_Adaptive }, 0, 0, VD, "deint" },
     { "gpu",      "GPU to be used for decoding", OFFSET(cu_gpu), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, VD },
     { "surfaces", "Maximum surfaces to be used for decoding", OFFSET(nb_surfaces), AV_OPT_TYPE_INT, { .i64 = 25 }, 0, INT_MAX, VD },
+    { "drop_second_field", "Drop second field when deinterlacing", OFFSET(drop_second_field), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, VD },
     { NULL }
 };
 
-- 
2.1.4

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