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rtpvp8pay: couple of minor optimisations

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Pre-allocate buffer list of the right size to avoid re-allocs.
Avoid plenty of double runtime cast checks and re-doing the
same calculation over and over again in rtp_vp8_calc_payload_len().
Only call gst_buffer_get_size() once.
This commit is contained in:
Tim-Philipp Müller 2014-06-18 13:20:44 +01:00
parent 6c9e2194d2
commit f4db7443ae
1 changed files with 23 additions and 21 deletions
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44
gst/rtp/gstrtpvp8pay.c
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@ -171,7 +171,8 @@ gst_rtp_vp8_pay_get_property (GObject * object,
}
static gboolean
gst_rtp_vp8_pay_parse_frame (GstRtpVP8Pay * self, GstBuffer * buffer)
gst_rtp_vp8_pay_parse_frame (GstRtpVP8Pay * self, GstBuffer * buffer,
gsize buffer_size)
{
GstBitReader *reader = NULL;
guint8 *data;
@ -187,7 +188,7 @@ gst_rtp_vp8_pay_parse_frame (GstRtpVP8Pay * self, GstBuffer * buffer)
BOOL_DECODER bc;
guint8 *pdata;
if (G_UNLIKELY (gst_buffer_get_size (buffer) < 3))
if (G_UNLIKELY (buffer_size < 3))
goto error;
if (!gst_buffer_map (buffer, &map, GST_MAP_READ) || !map.data)
@ -373,16 +374,7 @@ gst_rtp_vp8_calc_header_len (GstRtpVP8Pay * self)
}
}
static gsize
gst_rtp_vp8_calc_payload_len (GstRtpVP8Pay * self)
{
GstRTPBasePayload *payload = GST_RTP_BASE_PAYLOAD (self);
return gst_rtp_buffer_calc_payload_len (GST_RTP_BASE_PAYLOAD_MTU (payload) -
gst_rtp_vp8_calc_header_len (self), 0, 0);
}
/* When growing the vp8 header keep gst_rtp_vp8_calc_payload_len in sync */
/* When growing the vp8 header keep max payload len calculation in sync */
static GstBuffer *
gst_rtp_vp8_create_header_buffer (GstRtpVP8Pay * self, guint8 partid,
gboolean start, gboolean mark, GstBuffer * in)
@ -423,8 +415,8 @@ gst_rtp_vp8_create_header_buffer (GstRtpVP8Pay * self, guint8 partid,
static guint
gst_rtp_vp8_payload_next (GstRtpVP8Pay * self,
GstBufferList * list, guint offset, GstBuffer * buffer)
gst_rtp_vp8_payload_next (GstRtpVP8Pay * self, GstBufferList * list,
guint offset, GstBuffer * buffer, gsize buffer_size, gsize max_payload_len)
{
guint partition;
GstBuffer *header;
@ -434,8 +426,8 @@ gst_rtp_vp8_payload_next (GstRtpVP8Pay * self,
gsize remaining;
gsize available;
remaining = gst_buffer_get_size (buffer) - offset;
available = gst_rtp_vp8_calc_payload_len (self);
remaining = buffer_size - offset;
available = max_payload_len;
if (available > remaining)
available = remaining;
@ -462,17 +454,27 @@ gst_rtp_vp8_pay_handle_buffer (GstRTPBasePayload * payload, GstBuffer * buffer)
GstRtpVP8Pay *self = GST_RTP_VP8_PAY (payload);
GstFlowReturn ret;
GstBufferList *list;
guint offset;
gsize size, max_paylen;
guint offset, mtu, vp8_hdr_len;
if (G_UNLIKELY (!gst_rtp_vp8_pay_parse_frame (self, buffer))) {
size = gst_buffer_get_size (buffer);
if (G_UNLIKELY (!gst_rtp_vp8_pay_parse_frame (self, buffer, size))) {
g_message ("Failed to parse frame");
return GST_FLOW_ERROR;
}
list = gst_buffer_list_new ();
mtu = GST_RTP_BASE_PAYLOAD_MTU (payload);
vp8_hdr_len = gst_rtp_vp8_calc_header_len (self);
max_paylen = gst_rtp_buffer_calc_payload_len (mtu - vp8_hdr_len, 0, 0);
for (offset = 0; offset < gst_buffer_get_size (buffer);)
offset += gst_rtp_vp8_payload_next (self, list, offset, buffer);
list = gst_buffer_list_new_sized ((size / max_paylen) + 1);
offset = 0;
while (offset < size) {
offset +=
gst_rtp_vp8_payload_next (self, list, offset, buffer, size, max_paylen);
}
ret = gst_rtp_base_payload_push_list (payload, list);