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gstrtpbasepayloader: Add property for scaling RTP timestamp

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This patch introduces a property which, if set to FALSE, prevents RTP
basepayloader from scaling the RTP time when a segment's rate is not
equal to 1.0. The specification is ambiguous on this subject and some
clients expect the timestamps not to be scaled.
This commit is contained in:
Tobias Ronge 2020-03-09 15:26:42 +01:00
parent a777fe2628
commit f1b3ed37c6
1 changed files with 29 additions and 1 deletions
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30
gst-libs/gst/rtp/gstrtpbasepayload.c
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@ -53,6 +53,7 @@ struct _GstRTPBasePayloadPrivate
gint64 base_rtime;
guint64 base_rtime_hz;
guint64 running_time;
gboolean scale_rtptime;
gint64 prop_max_ptime;
gint64 caps_max_ptime;
@ -94,6 +95,7 @@ enum
#define DEFAULT_SOURCE_INFO FALSE
#define DEFAULT_ONVIF_NO_RATE_CONTROL FALSE
#define DEFAULT_TWCC_EXT_ID 0
#define DEFAULT_SCALE_RTPTIME TRUE
enum
{
@ -113,6 +115,7 @@ enum
PROP_SOURCE_INFO,
PROP_ONVIF_NO_RATE_CONTROL,
PROP_TWCC_EXT_ID,
PROP_SCALE_RTPTIME,
PROP_LAST
};
@ -361,6 +364,24 @@ gst_rtp_base_payload_class_init (GstRTPBasePayloadClass * klass)
0, 15, DEFAULT_TWCC_EXT_ID,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRTPBasePayload:scale-rtptime:
*
* Make the RTP packets' timestamps be scaled with the segment's rate
* (corresponding to RTSP speed parameter). Disabling this property means
* the timestamps will not be affected by the set delivery speed (RTSP speed).
*
* Example: A server wants to allow streaming a recorded video in double
* speed but still have the timestamps correspond to the position in the
* video. This is achieved by the client setting RTSP Speed to 2 while the
* server has this property disabled.
*
* Since: 1.18
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SCALE_RTPTIME,
g_param_spec_boolean ("scale-rtptime", "Scale RTP time",
"Whether the RTP timestamp should be scaled with the rate (speed)",
DEFAULT_SCALE_RTPTIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstelement_class->change_state = gst_rtp_base_payload_change_state;
@ -423,6 +444,7 @@ gst_rtp_base_payload_init (GstRTPBasePayload * rtpbasepayload, gpointer g_class)
rtpbasepayload->priv->base_offset = GST_BUFFER_OFFSET_NONE;
rtpbasepayload->priv->base_rtime_hz = GST_BUFFER_OFFSET_NONE;
rtpbasepayload->priv->onvif_no_rate_control = DEFAULT_ONVIF_NO_RATE_CONTROL;
rtpbasepayload->priv->scale_rtptime = DEFAULT_SCALE_RTPTIME;
rtpbasepayload->media = NULL;
rtpbasepayload->encoding_name = NULL;
@ -1332,7 +1354,7 @@ gst_rtp_base_payload_prepare_push (GstRTPBasePayload * payload,
guint64 rtime_hz;
/* no offset, use the gstreamer pts */
if (priv->onvif_no_rate_control)
if (priv->onvif_no_rate_control || !priv->scale_rtptime)
rtime_ns = gst_segment_to_stream_time (&payload->segment,
GST_FORMAT_TIME, data.pts);
else
@ -1617,6 +1639,9 @@ gst_rtp_base_payload_set_property (GObject * object, guint prop_id,
case PROP_TWCC_EXT_ID:
priv->twcc_ext_id = g_value_get_uint (value);
break;
case PROP_SCALE_RTPTIME:
priv->scale_rtptime = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -1690,6 +1715,9 @@ gst_rtp_base_payload_get_property (GObject * object, guint prop_id,
case PROP_TWCC_EXT_ID:
g_value_set_uint (value, priv->twcc_ext_id);
break;
case PROP_SCALE_RTPTIME:
g_value_set_boolean (value, priv->scale_rtptime);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;