From: Gyan Doshi <ffm...@gyani.pro>
Date: Mon, 9 Sep 2019 18:33:09 +0530
Subject: [PATCH v2] avdevice/decklink: add option to drop frames till
timecode
is seen
Option wait_for_tc only takes effect if tc_format is set
---
doc/indevs.texi | 8 ++++++++
libavdevice/decklink_common.h | 1 +
libavdevice/decklink_common_c.h | 1 +
libavdevice/decklink_dec.cpp | 10 ++++++++++
libavdevice/decklink_dec_c.c | 1 +
libavdevice/version.h | 2 +-
6 files changed, 22 insertions(+), 1 deletion(-)
diff --git a/doc/indevs.texi b/doc/indevs.texi
index 14595774f3..bc791013f2 100644
--- a/doc/indevs.texi
+++ b/doc/indevs.texi
@@ -395,6 +395,14 @@ Either sync could go wrong by 1 frame or in a
rarer case
@option{timestamp_align} seconds.
Defaults to @samp{0}.
+@item wait_for_tc (@emph{bool})
+Drop frames till a frame with timecode is received. Sometimes serial
timecode
+isn't received with the first input frame. If that happens, the
stored stream
+timecode will be inaccurate. If this option is set to @option{true},
input frames
+are dropped till a frame with timecode is received.
+Option @var{timecode_format} must have been set.
+Defaults to @option{false}.
+
@end table
@subsection Examples
diff --git a/libavdevice/decklink_common.h
b/libavdevice/decklink_common.h
index 921818ba41..35422a300b 100644
--- a/libavdevice/decklink_common.h
+++ b/libavdevice/decklink_common.h
@@ -149,6 +149,7 @@ struct decklink_ctx {
int channels;
int audio_depth;
+ unsigned long tc_seen; // used with option wait_for_tc
};
typedef enum { DIRECTION_IN, DIRECTION_OUT} decklink_direction_t;
diff --git a/libavdevice/decklink_common_c.h
b/libavdevice/decklink_common_c.h
index ca85ec2504..b78630b5fc 100644
--- a/libavdevice/decklink_common_c.h
+++ b/libavdevice/decklink_common_c.h
@@ -58,6 +58,7 @@ struct decklink_cctx {
int copyts;
int64_t timestamp_align;
int timing_offset;
+ int wait_for_tc;
};
#endif /* AVDEVICE_DECKLINK_COMMON_C_H */
diff --git a/libavdevice/decklink_dec.cpp b/libavdevice/decklink_dec.cpp
index 4da9122bff..ab7f28112e 100644
--- a/libavdevice/decklink_dec.cpp
+++ b/libavdevice/decklink_dec.cpp
@@ -784,6 +784,8 @@ HRESULT
decklink_input_callback::VideoInputFrameArrived(
if (packed_metadata) {
if (av_packet_add_side_data(&pkt,
AV_PKT_DATA_STRINGS_METADATA, packed_metadata, metadata_len) < 0)
av_freep(&packed_metadata);
+ else if (!ctx->tc_seen)
+ ctx->tc_seen = ctx->frameCount;
}
}
}
@@ -793,6 +795,14 @@ HRESULT
decklink_input_callback::VideoInputFrameArrived(
}
}
+ if (ctx->tc_format && cctx->wait_for_tc && !ctx->tc_seen) {
+
+ av_log(avctx, AV_LOG_WARNING, "No TC detected yet.
wait_for_tc set. Dropping. \n");
+ av_log(avctx, AV_LOG_WARNING, "Frame received (#%lu) - "
+ "- Frames dropped %u\n", ctx->frameCount,
++ctx->dropped);
+ return S_OK;
+ }
+
pkt.pts = get_pkt_pts(videoFrame, audioFrame, wallclock,
abs_wallclock, ctx->video_pts_source, ctx->video_st->time_base,
&initial_video_pts, cctx->copyts);
pkt.dts = pkt.pts;
diff --git a/libavdevice/decklink_dec_c.c b/libavdevice/decklink_dec_c.c
index 7aceaf934c..99439f91ae 100644
--- a/libavdevice/decklink_dec_c.c
+++ b/libavdevice/decklink_dec_c.c
@@ -85,6 +85,7 @@ static const AVOption options[] = {
{ "audio_depth", "audio bitdepth (16 or 32)",
OFFSET(audio_depth), AV_OPT_TYPE_INT, { .i64 = 16}, 16, 32, DEC },
{ "decklink_copyts", "copy timestamps, do not remove the initial
offset", OFFSET(copyts), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, DEC },
{ "timestamp_align", "capture start time alignment (in
seconds)", OFFSET(timestamp_align), AV_OPT_TYPE_DURATION, { .i64 = 0
}, 0, INT_MAX, DEC },
+ { "wait_for_tc", "drop frames till a frame with timecode is
received. TC format must be set", OFFSET(wait_for_tc),
AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, DEC },
{ NULL },
};
diff --git a/libavdevice/version.h b/libavdevice/version.h
index e3a583d267..68302908cf 100644
--- a/libavdevice/version.h
+++ b/libavdevice/version.h
@@ -29,7 +29,7 @@
#define LIBAVDEVICE_VERSION_MAJOR 58
#define LIBAVDEVICE_VERSION_MINOR 9
-#define LIBAVDEVICE_VERSION_MICRO 100
+#define LIBAVDEVICE_VERSION_MICRO 101
#define LIBAVDEVICE_VERSION_INT
AV_VERSION_INT(LIBAVDEVICE_VERSION_MAJOR, \
LIBAVDEVICE_VERSION_MINOR, \
--
2.24.0
