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rtpvrawpay: use buffer lists

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Collect buffers to send out in buffer lists instead of
pushing out single buffers one at a time. For HD video
each frame might easily add up to a couple of thousand
packets, multiply that by the frame rate and that's a
lot of push() and sendmsg() calls per second.

A good reason to push out buffers as early as possible is
latency, so we don't accumulate the whole frame in a single
buffer list, but instead push it out in a few chunks, which
is hopefully a reasonable compromise.
This commit is contained in:
Tim-Philipp Müller 2014-06-16 13:38:47 +01:00
parent 884d1af074
commit fdf95fecbd
1 changed files with 29 additions and 6 deletions
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35
gst/rtp/gstrtpvrawpay.c
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@ -239,15 +239,18 @@ gst_rtp_vraw_pay_handle_buffer (GstRTPBasePayload * payload, GstBuffer * buffer)
{ {
GstRtpVRawPay *rtpvrawpay; GstRtpVRawPay *rtpvrawpay;
GstFlowReturn ret = GST_FLOW_OK; GstFlowReturn ret = GST_FLOW_OK;
guint lines_delay; /* after how many packed lines we push out a buffer list */
guint last_line; /* last pack line number we pushed out a buffer list */
guint line, offset; guint line, offset;
guint8 *p0, *yp, *up, *vp; guint8 *p0, *yp, *up, *vp;
guint ystride, uvstride; guint ystride, uvstride;
guint pgroup; guint pgroup;
guint mtu; guint mtu;
guint width, height; guint width, height;
gint field; gint field, fields;
GstVideoFrame frame; GstVideoFrame frame;
gint interlaced; gint interlaced;
GstBufferList *list;
GstRTPBuffer rtp = { NULL, }; GstRTPBuffer rtp = { NULL, };
rtpvrawpay = GST_RTP_VRAW_PAY (payload); rtpvrawpay = GST_RTP_VRAW_PAY (payload);
@ -275,17 +278,25 @@ gst_rtp_vraw_pay_handle_buffer (GstRTPBasePayload * payload, GstBuffer * buffer)
interlaced = GST_VIDEO_INFO_IS_INTERLACED (&rtpvrawpay->vinfo); interlaced = GST_VIDEO_INFO_IS_INTERLACED (&rtpvrawpay->vinfo);
/* after how many packed lines we push out a buffer list */
lines_delay = GST_ROUND_UP_4 (height / 10);
fields = 1 + interlaced;
/* start with line 0, offset 0 */ /* start with line 0, offset 0 */
for (field = 0; field < 1 + interlaced; field++) { for (field = 0; field < fields; field++) {
line = field; line = field;
offset = 0; offset = 0;
last_line = 0;
list = gst_buffer_list_new ();
/* write all lines */ /* write all lines */
while (line < height) { while (line < height) {
guint left; guint left, pack_line;
GstBuffer *out; GstBuffer *out;
guint8 *outdata, *headers; guint8 *outdata, *headers;
gboolean next_line; gboolean next_line, complete = FALSE;
guint length, cont, pixels; guint length, cont, pixels;
/* get the max allowed payload length size, we try to fill the complete MTU */ /* get the max allowed payload length size, we try to fill the complete MTU */
@ -496,6 +507,7 @@ gst_rtp_vraw_pay_handle_buffer (GstRTPBasePayload * payload, GstBuffer * buffer)
if (line >= height) { if (line >= height) {
GST_LOG_OBJECT (rtpvrawpay, "field/frame complete, set marker"); GST_LOG_OBJECT (rtpvrawpay, "field/frame complete, set marker");
gst_rtp_buffer_set_marker (&rtp, TRUE); gst_rtp_buffer_set_marker (&rtp, TRUE);
complete = TRUE;
} }
gst_rtp_buffer_unmap (&rtp); gst_rtp_buffer_unmap (&rtp);
if (left > 0) { if (left > 0) {
@ -503,8 +515,19 @@ gst_rtp_vraw_pay_handle_buffer (GstRTPBasePayload * payload, GstBuffer * buffer)
gst_buffer_resize (out, 0, gst_buffer_get_size (out) - left); gst_buffer_resize (out, 0, gst_buffer_get_size (out) - left);
} }
/* push buffer */ gst_buffer_list_add (list, out);
ret = gst_rtp_base_payload_push (payload, out);
pack_line = (line - field) / fields;
if (complete || (pack_line > last_line && pack_line % lines_delay == 0)) {
/* push buffers */
GST_LOG_OBJECT (rtpvrawpay, "pushing list of %u buffers up to pack "
"line %u", gst_buffer_list_length (list), pack_line);
ret = gst_rtp_base_payload_push_list (payload, list);
list = NULL;
if (!complete)
list = gst_buffer_list_new ();
last_line = pack_line;
}
} }
} }