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pcapparse: optionally output relative timestamps, possibly shifted by offset

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That is, output timestamps can then either be the absolute capture time,
or the relative capture time (w.r.t. to first output buffer), or the relative
capture time incremented by some offset.
This commit is contained in:
Mark Nauwelaerts 2011-07-14 16:50:29 +02:00
parent 93af6831e2
commit 671a9faad6
2 changed files with 26 additions and 0 deletions
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24
gst/pcapparse/gstpcapparse.c
View file

@ -64,6 +64,7 @@ enum
PROP_SRC_PORT,
PROP_DST_PORT,
PROP_CAPS,
PROP_OFFSET,
PROP_LAST
};
@ -143,6 +144,11 @@ gst_pcap_parse_class_init (GstPcapParseClass * klass)
"The caps of the source pad", GST_TYPE_CAPS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_OFFSET,
g_param_spec_int64 ("offset", "Offset",
"Relative timestamp offset (ns) to apply (-1 = use absolute packet time)",
-1, G_MAXINT64, -1, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
GST_DEBUG_CATEGORY_INIT (gst_pcap_parse_debug, "pcapparse", 0, "pcap parser");
}
@ -165,6 +171,7 @@ gst_pcap_parse_init (GstPcapParse * self, GstPcapParseClass * gclass)
self->dst_ip = -1;
self->src_port = -1;
self->dst_port = -1;
self->offset = -1;
self->adapter = gst_adapter_new ();
@ -234,6 +241,10 @@ gst_pcap_parse_get_property (GObject * object, guint prop_id,
gst_value_set_caps (value, self->caps);
break;
case PROP_OFFSET:
g_value_set_int64 (value, self->offset);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -283,6 +294,11 @@ gst_pcap_parse_set_property (GObject * object, guint prop_id,
gst_pad_set_caps (self->src_pad, new_caps);
break;
}
case PROP_OFFSET:
self->offset = g_value_get_int64 (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -297,6 +313,7 @@ gst_pcap_parse_reset (GstPcapParse * self)
self->cur_packet_size = -1;
self->buffer_offset = 0;
self->cur_ts = GST_CLOCK_TIME_NONE;
self->base_ts = GST_CLOCK_TIME_NONE;
self->newsegment_sent = FALSE;
gst_adapter_clear (self->adapter);
@ -461,6 +478,13 @@ gst_pcap_parse_chain (GstPad * pad, GstBuffer * buffer)
if (ret == GST_FLOW_OK) {
if (GST_CLOCK_TIME_IS_VALID (self->cur_ts)) {
if (!GST_CLOCK_TIME_IS_VALID (self->base_ts))
self->base_ts = self->cur_ts;
if (self->offset >= 0)
self->cur_ts -= self->base_ts + self->offset;
}
memcpy (GST_BUFFER_DATA (out_buf), payload_data, payload_size);
GST_BUFFER_TIMESTAMP (out_buf) = self->cur_ts;

2
gst/pcapparse/gstpcapparse.h
View file

@ -71,6 +71,7 @@ struct _GstPcapParse
gint32 src_port;
gint32 dst_port;
GstCaps *caps;
gint64 offset;
/* state */
GstAdapter * adapter;
@ -78,6 +79,7 @@ struct _GstPcapParse
gboolean swap_endian;
gint64 cur_packet_size;
GstClockTime cur_ts;
GstClockTime base_ts;
GstPcapParseLinktype linktype;
gboolean newsegment_sent;