lavd/decklink_dec: add option to disable drawing bars on signal loss

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

doc/indevs.texi

@@ -273,6 +273,10 @@ Sets the video packet timestamp source. Must be @samp{video}, @samp{audio},
 Sets the audio packet timestamp source. Must be @samp{video}, @samp{audio},
 @samp{reference} or @samp{wallclock}. Defaults to @samp{audio}.
 
+@item draw_bars
+If set to @samp{true}, color bars are drawn in the event of a signal loss.
+Defaults to @samp{true}.
+
 @end table
 
 @subsection Examples

libavdevice/decklink_common.h

@@ -84,6 +84,7 @@ struct decklink_ctx {
     int duplex_mode;
     DecklinkPtsSource audio_pts_source;
     DecklinkPtsSource video_pts_source;
+    int draw_bars;
 
     int frames_preroll;
     int frames_buffer;

libavdevice/decklink_common_c.h

@@ -46,6 +46,7 @@ struct decklink_cctx {
     DecklinkPtsSource video_pts_source;
     int audio_input;
     int video_input;
+    int draw_bars;
 };
 
 #endif /* AVDEVICE_DECKLINK_COMMON_C_H */

libavdevice/decklink_dec.cpp

@@ -309,7 +309,7 @@ HRESULT decklink_input_callback::VideoInputFrameArrived(
                                   ctx->video_st->time_base.den);
 
         if (videoFrame->GetFlags() & bmdFrameHasNoInputSource) {
-            if (videoFrame->GetPixelFormat() == bmdFormat8BitYUV) {
+            if (ctx->draw_bars && videoFrame->GetPixelFormat() == bmdFormat8BitYUV) {
             unsigned bars[8] = {
                 0xEA80EA80, 0xD292D210, 0xA910A9A5, 0x90229035,
                 0x6ADD6ACA, 0x51EF515A, 0x286D28EF, 0x10801080 };
@@ -485,6 +485,7 @@ av_cold int ff_decklink_read_header(AVFormatContext *avctx)
         ctx->audio_input = decklink_audio_connection_map[cctx->audio_input];
     ctx->audio_pts_source = cctx->audio_pts_source;
     ctx->video_pts_source = cctx->video_pts_source;
+    ctx->draw_bars = cctx->draw_bars;
     cctx->ctx = ctx;
 
 #if !CONFIG_LIBZVBI

libavdevice/decklink_dec_c.c

@@ -62,6 +62,7 @@ static const AVOption options[] = {
     { "video",         NULL,                                          0,  AV_OPT_TYPE_CONST, { .i64 = PTS_SRC_VIDEO    }, 0, 0, DEC, "pts_source"},
     { "reference",     NULL,                                          0,  AV_OPT_TYPE_CONST, { .i64 = PTS_SRC_REFERENCE}, 0, 0, DEC, "pts_source"},
     { "wallclock",     NULL,                                          0,  AV_OPT_TYPE_CONST, { .i64 = PTS_SRC_WALLCLOCK}, 0, 0, DEC, "pts_source"},
+    { "draw_bars",     "draw bars on signal loss" , OFFSET(draw_bars),    AV_OPT_TYPE_BOOL,  { .i64 = 1}, 0, 1, DEC },
     { NULL },
 };
 

libavdevice/version.h

@@ -29,7 +29,7 @@
 
 #define LIBAVDEVICE_VERSION_MAJOR  57
 #define LIBAVDEVICE_VERSION_MINOR   0
-#define LIBAVDEVICE_VERSION_MICRO 102
+#define LIBAVDEVICE_VERSION_MICRO 103
 
 #define LIBAVDEVICE_VERSION_INT AV_VERSION_INT(LIBAVDEVICE_VERSION_MAJOR, \
                                                LIBAVDEVICE_VERSION_MINOR, \