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rtpgstpay: add support for sending events

Browse source 
We currently only send tags and custom events. The other events
might interfere with the receiver timings or are otherwise handled
by RTP.

Conflicts:
	gst/rtp/gstrtpgstpay.c
This commit is contained in:
Wim Taymans 2012-11-01 17:40:31 +00:00
parent 6502d08e43
commit 54b783b5a3
2 changed files with 95 additions and 31 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

125
gst/rtp/gstrtpgstpay.c
View file

@ -34,22 +34,26 @@ GST_DEBUG_CATEGORY_STATIC (gst_rtp_pay_debug);
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |C| CV |D|0|0|0| MBZ |
* |C| CV |D|0|0|0| ETYPE | MBZ |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Frag_offset |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* C: caps inlined flag
* C: caps inlined flag
* When C set, first part of payload contains caps definition. Caps definition
* starts with variable-length length prefix and then a string of that length.
* the length is encoded in big endian 7 bit chunks, the top 1 bit of a byte
* is the continuation marker and the 7 next bits the data. A continuation
* marker of 1 means that the next byte contains more data.
* marker of 1 means that the next byte contains more data.
*
* CV: caps version, 0 = caps from SDP, 1 - 7 inlined caps
* D: delta unit buffer
*
*
* ETYPE: type of event. Payload contains the event, prefixed with a
* variable length field.
* 0 = NO event
* 1 = GST_EVENT_TAG
* 2 = GST_EVENT_CUSTOM_DOWNSTREAM
* 3 = GST_EVENT_CUSTOM_BOTH
*/
static GstStaticPadTemplate gst_rtp_gst_pay_sink_template =
@ -74,6 +78,8 @@ static gboolean gst_rtp_gst_pay_setcaps (GstRTPBasePayload * payload,
GstCaps * caps);
static GstFlowReturn gst_rtp_gst_pay_handle_buffer (GstRTPBasePayload * payload,
GstBuffer * buffer);
static gboolean gst_rtp_gst_pay_sink_event (GstRTPBasePayload * payload,
GstEvent * event);
#define gst_rtp_gst_pay_parent_class parent_class
G_DEFINE_TYPE (GstRtpGSTPay, gst_rtp_gst_pay, GST_TYPE_RTP_BASE_PAYLOAD);
@ -103,6 +109,7 @@ gst_rtp_gst_pay_class_init (GstRtpGSTPayClass * klass)
gstrtpbasepayload_class->set_caps = gst_rtp_gst_pay_setcaps;
gstrtpbasepayload_class->handle_buffer = gst_rtp_gst_pay_handle_buffer;
gstrtpbasepayload_class->sink_event = gst_rtp_gst_pay_sink_event;
GST_DEBUG_CATEGORY_INIT (gst_rtp_pay_debug, "rtpgstpay", 0,
"rtpgstpay element");
@ -112,6 +119,8 @@ static void
gst_rtp_gst_pay_init (GstRtpGSTPay * rtpgstpay)
{
rtpgstpay->adapter = gst_adapter_new ();
gst_rtp_base_payload_set_options (GST_RTP_BASE_PAYLOAD (rtpgstpay),
"application", TRUE, "X-GST", 90000);
}
static void
@ -167,13 +176,14 @@ gst_rtp_gst_pay_flush (GstRtpGSTPay * rtpgstpay, GstClockTime timestamp)
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |C| CV |D|0|0|0| MBZ |
* |C| CV |D|0|0|0| ETYPE | MBZ |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Frag_offset |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
payload[0] = rtpgstpay->flags;
payload[1] = payload[2] = payload[3] = 0;
payload[1] = rtpgstpay->etype;
payload[2] = payload[3] = 0;
payload[4] = frag_offset >> 24;
payload[5] = frag_offset >> 16;
payload[6] = frag_offset >> 8;
@ -202,6 +212,7 @@ gst_rtp_gst_pay_flush (GstRtpGSTPay * rtpgstpay, GstClockTime timestamp)
goto push_failed;
}
rtpgstpay->flags &= 0x70;
rtpgstpay->etype = 0;
return GST_FLOW_OK;
@ -212,20 +223,49 @@ push_failed:
gst_flow_get_name (ret));
gst_adapter_clear (rtpgstpay->adapter);
rtpgstpay->flags &= 0x70;
rtpgstpay->etype = 0;
return ret;
}
}
static GstBuffer *
make_data_buffer (GstRtpGSTPay * rtpgstpay, gchar * data, guint size)
{
guint plen;
guint8 *ptr;
GstBuffer *outbuf;
GstMapInfo map;
/* calculate length */
plen = 1;
while (size >> (7 * plen))
plen++;
outbuf = gst_buffer_new_allocate (NULL, plen + size, NULL);
gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
ptr = map.data;
/* write length */
while (plen) {
plen--;
*ptr++ = ((plen > 0) ? 0x80 : 0) | ((size >> (7 * plen)) & 0x7f);
}
/* copy data */
memcpy (ptr, data, size);
gst_buffer_unmap (outbuf, &map);
return outbuf;
}
static gboolean
gst_rtp_gst_pay_setcaps (GstRTPBasePayload * payload, GstCaps * caps)
{
GstRtpGSTPay *rtpgstpay;
gboolean res;
gchar *capsstr, *capsenc, *capsver;
guint capslen, capslen_prefix_len;
guint8 *ptr;
guint capslen;
GstBuffer *outbuf;
GstMapInfo map;
rtpgstpay = GST_RTP_GST_PAY (payload);
@ -240,24 +280,8 @@ gst_rtp_gst_pay_setcaps (GstRTPBasePayload * payload, GstCaps * caps)
/* for 0 byte */
capslen++;
/* start of buffer, calculate length */
capslen_prefix_len = 1;
while (capslen >> (7 * capslen_prefix_len))
capslen_prefix_len++;
outbuf = gst_buffer_new_and_alloc (capslen + capslen_prefix_len);
gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
ptr = map.data;
/* write caps length */
while (capslen_prefix_len) {
capslen_prefix_len--;
*ptr++ = ((capslen_prefix_len > 0) ? 0x80 : 0) |
((capslen >> (7 * capslen_prefix_len)) & 0x7f);
}
memcpy (ptr, capsstr, capslen);
gst_buffer_unmap (outbuf, &map);
/* make a data buffer of it */
outbuf = make_data_buffer (rtpgstpay, capsstr, capslen);
g_free (capsstr);
/* store in adapter, we don't flush yet, buffer will follow */
@ -265,9 +289,6 @@ gst_rtp_gst_pay_setcaps (GstRTPBasePayload * payload, GstCaps * caps)
rtpgstpay->next_CV = (rtpgstpay->next_CV + 1) & 0x7;
gst_adapter_push (rtpgstpay->adapter, outbuf);
gst_rtp_base_payload_set_options (payload, "application", TRUE, "X-GST",
90000);
/* make caps for SDP */
capsver = g_strdup_printf ("%d", rtpgstpay->current_CV);
res =
@ -279,6 +300,48 @@ gst_rtp_gst_pay_setcaps (GstRTPBasePayload * payload, GstCaps * caps)
return res;
}
static gboolean
gst_rtp_gst_pay_sink_event (GstRTPBasePayload * payload, GstEvent * event)
{
GstRtpGSTPay *rtpgstpay;
rtpgstpay = GST_RTP_GST_PAY (payload);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_TAG:
rtpgstpay->etype = 1;
break;
case GST_EVENT_CUSTOM_DOWNSTREAM:
rtpgstpay->etype = 2;
break;
case GST_EVENT_CUSTOM_BOTH:
rtpgstpay->etype = 2;
break;
default:
break;
}
if (rtpgstpay->etype) {
const GstStructure *s;
gchar *estr;
guint elen;
GstBuffer *outbuf;
GST_DEBUG_OBJECT (rtpgstpay, "make event type %d", rtpgstpay->etype);
s = gst_event_get_structure (event);
estr = gst_structure_to_string (s);
elen = strlen (estr);
outbuf = make_data_buffer (rtpgstpay, estr, elen);
g_free (estr);
gst_adapter_push (rtpgstpay->adapter, outbuf);
/* flush the adapter immediately */
gst_rtp_gst_pay_flush (rtpgstpay, GST_CLOCK_TIME_NONE);
}
return GST_RTP_BASE_PAYLOAD_CLASS (parent_class)->sink_event (payload, event);
}
static GstFlowReturn
gst_rtp_gst_pay_handle_buffer (GstRTPBasePayload * basepayload,
GstBuffer * buffer)

1
gst/rtp/gstrtpgstpay.h
View file

@ -46,6 +46,7 @@ struct _GstRtpGSTPay
GstAdapter *adapter;
guint8 flags;
guint8 etype;
guint8 current_CV; /* CV field of incoming caps*/
guint8 next_CV;