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inputselector: Add drop-backwards property

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When sync-streams=true, drop backwards buffers on pad switch.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3256>
This commit is contained in:
Vivia Nikolaidou 2022-10-24 18:02:27 +03:00
parent 5fb71dd55b
commit c6af0a39e7
3 changed files with 67 additions and 1 deletions
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12
subprojects/gstreamer/docs/plugins/gst_plugins_cache.json
View file

@ -1332,6 +1332,18 @@
"type": "gboolean",
"writable": true
},
"drop-backwards": {
"blurb": "Drop backwards buffers on pad switch",
"conditionally-available": false,
"construct": false,
"construct-only": false,
"controllable": false,
"default": "false",
"mutable": "ready",
"readable": true,
"type": "gboolean",
"writable": true
},
"n-pads": {
"blurb": "The number of sink pads",
"conditionally-available": false,

54
subprojects/gstreamer/plugins/elements/gstinputselector.c
View file

@ -101,13 +101,15 @@ enum
PROP_ACTIVE_PAD,
PROP_SYNC_STREAMS,
PROP_SYNC_MODE,
PROP_CACHE_BUFFERS
PROP_CACHE_BUFFERS,
PROP_DROP_BACKWARDS
};
#define DEFAULT_SYNC_STREAMS TRUE
#define DEFAULT_SYNC_MODE GST_INPUT_SELECTOR_SYNC_MODE_ACTIVE_SEGMENT
#define DEFAULT_CACHE_BUFFERS FALSE
#define DEFAULT_PAD_ALWAYS_OK TRUE
#define DEFAULT_DROP_BACKWARDS FALSE
enum
{
@ -577,6 +579,7 @@ gst_selector_pad_event (GstPad * pad, GstObject * parent, GstEvent * event)
break;
case GST_EVENT_FLUSH_STOP:
gst_selector_pad_reset (selpad);
sel->last_output_ts = GST_CLOCK_TIME_NONE;
break;
case GST_EVENT_SEGMENT:
{
@ -1041,6 +1044,8 @@ gst_selector_pad_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
GstPad *active_sinkpad;
GstPad *prev_active_sinkpad = NULL;
GstSelectorPad *selpad;
GstSegment seg;
GstClockTime running_time = GST_CLOCK_TIME_NONE;
sel = GST_INPUT_SELECTOR (parent);
selpad = GST_SELECTOR_PAD_CAST (pad);
@ -1165,7 +1170,25 @@ gst_selector_pad_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
prev_active_sinkpad = NULL;
}
seg = selpad->segment;
if (seg.format == GST_FORMAT_TIME)
running_time =
gst_segment_to_running_time (&seg, GST_FORMAT_TIME,
GST_BUFFER_DTS_OR_PTS (buf));
if (selpad->discont) {
GST_INPUT_SELECTOR_LOCK (sel);
if (sel->sync_streams && sel->drop_backwards
&& GST_CLOCK_TIME_IS_VALID (running_time)) {
/* Just switched. Make sure timestamps don't go backwards */
if (running_time < sel->last_output_ts
&& GST_CLOCK_TIME_IS_VALID (sel->last_output_ts)) {
GST_DEBUG_OBJECT (pad, "Discarding buffer %p with backwards timestamp",
buf);
goto ignore;
}
}
GST_INPUT_SELECTOR_UNLOCK (sel);
buf = gst_buffer_make_writable (buf);
GST_DEBUG_OBJECT (pad, "Marking discont buffer %p", buf);
@ -1176,6 +1199,7 @@ gst_selector_pad_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
/* forward */
GST_LOG_OBJECT (pad, "Forwarding buffer %p with timestamp %" GST_TIME_FORMAT,
buf, GST_TIME_ARGS (GST_BUFFER_PTS (buf)));
sel->last_output_ts = running_time;
/* Only make the buffer read-only when necessary */
if (sel->sync_streams && sel->cache_buffers)
@ -1344,6 +1368,22 @@ gst_input_selector_class_init (GstInputSelectorClass * klass)
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_READY));
/**
* GstInputSelector:drop-backwards
*
* If set to %TRUE and GstInputSelector:sync-streams is also set to %TRUE,
* every time the input is switched, buffers that would go backwards related
* to the last output buffer pre-switch will be dropped.
*
* Since: 1.22
*/
g_object_class_install_property (gobject_class, PROP_DROP_BACKWARDS,
g_param_spec_boolean ("drop-backwards", "Drop Backwards Buffers",
"Drop backwards buffers on pad switch",
DEFAULT_DROP_BACKWARDS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_READY));
gst_element_class_set_static_metadata (gstelement_class, "Input selector",
"Generic", "N-to-1 input stream selector",
"Julien Moutte <julien@moutte.net>, "
@ -1386,6 +1426,7 @@ gst_input_selector_init (GstInputSelector * sel)
sel->eos = FALSE;
sel->upstream_latency = 0;
sel->last_output_ts = GST_CLOCK_TIME_NONE;
/* lets give a change for downstream to do something on
* active-pad change before we start pushing new buffers */
@ -1514,6 +1555,11 @@ gst_input_selector_set_property (GObject * object, guint prop_id,
sel->cache_buffers = g_value_get_boolean (value);
GST_INPUT_SELECTOR_UNLOCK (object);
break;
case PROP_DROP_BACKWARDS:
GST_INPUT_SELECTOR_LOCK (object);
sel->drop_backwards = g_value_get_boolean (value);
GST_INPUT_SELECTOR_UNLOCK (object);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -1562,6 +1608,11 @@ gst_input_selector_get_property (GObject * object, guint prop_id,
g_value_set_boolean (value, sel->cache_buffers);
GST_INPUT_SELECTOR_UNLOCK (object);
break;
case PROP_DROP_BACKWARDS:
GST_INPUT_SELECTOR_LOCK (object);
g_value_set_boolean (value, sel->drop_backwards);
GST_INPUT_SELECTOR_UNLOCK (object);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -1940,6 +1991,7 @@ gst_input_selector_reset (GstInputSelector * sel)
}
sel->have_group_id = TRUE;
sel->upstream_latency = 0;
sel->last_output_ts = GST_CLOCK_TIME_NONE;
GST_INPUT_SELECTOR_UNLOCK (sel);
}

2
subprojects/gstreamer/plugins/elements/gstinputselector.h
View file

@ -72,6 +72,7 @@ struct _GstInputSelector {
gboolean sync_streams;
GstInputSelectorSyncMode sync_mode;
gboolean cache_buffers;
gboolean drop_backwards;
gboolean have_group_id;
@ -82,6 +83,7 @@ struct _GstInputSelector {
gboolean flushing;
GstClockTime upstream_latency;
GstClockTime last_output_ts;
};
struct _GstInputSelectorClass {