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decklinkvideo/audiosrc: Add GstReferenceTimestampMeta with the stream time to each buffer

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This is basically a frame counter provided by the driver and it's
advancing at the speed of the HDMI/SDI input. Having this available on
each buffer allows to know what constant-framerate-based timestamp each
frame is corresponding to and can be used e.g. to write out files
accordingly without having the local pipeline clock timestamps used.

https://bugzilla.gnome.org/show_bug.cgi?id=779213
This commit is contained in:
Sebastian Dröge 2017-02-25 12:37:46 +02:00
parent 4df6be45f0
commit 5dc1039937
2 changed files with 19 additions and 0 deletions
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10
sys/decklink/gstdecklinkaudiosrc.cpp
View file

@ -61,6 +61,8 @@ typedef struct
{
IDeckLinkAudioInputPacket *packet;
GstClockTime timestamp;
GstClockTime stream_timestamp;
GstClockTime stream_duration;
gboolean no_signal;
} CapturePacket;
@ -531,6 +533,8 @@ gst_decklink_audio_src_got_packet (GstElement * element,
memset (&p, 0, sizeof (p));
p.packet = packet;
p.timestamp = timestamp;
p.stream_timestamp = stream_time;
p.stream_duration = stream_duration;
p.no_signal = no_signal;
packet->AddRef ();
gst_queue_array_push_tail_struct (self->current_packets, &p);
@ -553,6 +557,8 @@ gst_decklink_audio_src_create (GstPushSrc * bsrc, GstBuffer ** buffer)
GstClockTime start_time, end_time;
guint64 start_offset, end_offset;
gboolean discont = FALSE;
static GstStaticCaps stream_reference =
GST_STATIC_CAPS ("timestamp/x-stream");
retry:
g_mutex_lock (&self->lock);
@ -667,6 +673,10 @@ retry:
GST_BUFFER_TIMESTAMP (*buffer) = timestamp;
GST_BUFFER_DURATION (*buffer) = duration;
gst_buffer_add_reference_timestamp_meta (*buffer,
gst_static_caps_get (&stream_reference), p.stream_timestamp,
p.stream_duration);
GST_DEBUG_OBJECT (self,
"Outputting buffer %p with timestamp %" GST_TIME_FORMAT " and duration %"
GST_TIME_FORMAT, *buffer, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (*buffer)),

9
sys/decklink/gstdecklinkvideosrc.cpp
View file

@ -55,6 +55,8 @@ typedef struct
{
IDeckLinkVideoInputFrame *frame;
GstClockTime timestamp, duration;
GstClockTime stream_timestamp;
GstClockTime stream_duration;
GstDecklinkModeEnum mode;
BMDPixelFormat format;
GstVideoTimeCode *tc;
@ -684,6 +686,8 @@ gst_decklink_video_src_got_frame (GstElement * element,
f.frame = frame;
f.timestamp = timestamp;
f.duration = duration;
f.stream_timestamp = stream_time;
f.stream_duration = stream_duration;
f.mode = mode;
f.format = frame->GetPixelFormat ();
f.no_signal = no_signal;
@ -743,6 +747,8 @@ gst_decklink_video_src_create (GstPushSrc * bsrc, GstBuffer ** buffer)
GstCaps *caps;
gboolean caps_changed = FALSE;
const GstDecklinkMode *mode;
static GstStaticCaps stream_reference =
GST_STATIC_CAPS ("timestamp/x-stream");
g_mutex_lock (&self->lock);
while (gst_queue_array_is_empty (self->current_frames) && !self->flushing) {
@ -840,6 +846,9 @@ gst_decklink_video_src_create (GstPushSrc * bsrc, GstBuffer ** buffer)
GST_BUFFER_DURATION (*buffer) = f.duration;
if (f.tc != NULL)
gst_buffer_add_video_time_code_meta (*buffer, f.tc);
gst_buffer_add_reference_timestamp_meta (*buffer,
gst_static_caps_get (&stream_reference), f.stream_timestamp,
f.stream_duration);
mode = gst_decklink_get_mode (self->mode);
if (mode->interlaced && mode->tff)