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avdevice/decklink_dec: add option to align capture start time

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This option is useful for maintaining input synchronization across N
different hardware devices deployed for 'N-way' redundancy.
The system time of different hardware devices should be synchronized
with protocols such as NTP or PTP, before using this option.

Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Karthick Jeyapal
2018-09-28 12:55:54 +05:30
committed by Marton Balint
parent 449b1dcd7d
commit c0ee4e0ac2
5 changed files with 27 additions and 1 deletions
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libavdevice/decklink_dec_c.c
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@@ -84,6 +84,7 @@ static const AVOption options[] = {
{ "queue_size", "input queue buffer size", OFFSET(queue_size), AV_OPT_TYPE_INT64, { .i64 = (1024 * 1024 * 1024)}, 0, INT64_MAX, DEC },
{ "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 },
{ NULL },
};