gstreamer/gst/rtp/gstrtpvp8depay.c
Nicolas Dufresne 0f4f948f5f rtpvp8: Use VP8 encoding name
Both Firefox and Chrome uses VP8 as the encoding in their SDP.
Adding this now defacto standard name removes the need for special
case in SDP parsing code.

https://bugzilla.gnome.org/show_bug.cgi?id=737810
2014-11-01 11:26:26 -04:00

218 lines
6.4 KiB
C

/* gstrtpvp8depay.c - Source for GstRtpVP8Depay
* Copyright (C) 2011 Sjoerd Simons <sjoerd@luon.net>
* Copyright (C) 2011 Collabora Ltd.
* Contact: Youness Alaoui <youness.alaoui@collabora.co.uk>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "gstrtpvp8depay.h"
GST_DEBUG_CATEGORY_STATIC (gst_rtp_vp8_depay_debug);
#define GST_CAT_DEFAULT gst_rtp_vp8_depay_debug
static void gst_rtp_vp8_depay_dispose (GObject * object);
static GstBuffer *gst_rtp_vp8_depay_process (GstRTPBaseDepayload * depayload,
GstBuffer * buf);
static gboolean gst_rtp_vp8_depay_set_caps (GstRTPBaseDepayload * depayload,
GstCaps * caps);
G_DEFINE_TYPE (GstRtpVP8Depay, gst_rtp_vp8_depay, GST_TYPE_RTP_BASE_DEPAYLOAD);
static GstStaticPadTemplate gst_rtp_vp8_depay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-vp8"));
static GstStaticPadTemplate gst_rtp_vp8_depay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp, "
"clock-rate = (int) 90000,"
"media = (string) \"video\","
"encoding-name = (string) { \"VP8\", \"VP8-DRAFT-IETF-01\" }"));
static void
gst_rtp_vp8_depay_init (GstRtpVP8Depay * self)
{
self->adapter = gst_adapter_new ();
self->started = FALSE;
}
static void
gst_rtp_vp8_depay_class_init (GstRtpVP8DepayClass * gst_rtp_vp8_depay_class)
{
GObjectClass *object_class = G_OBJECT_CLASS (gst_rtp_vp8_depay_class);
GstElementClass *element_class = GST_ELEMENT_CLASS (gst_rtp_vp8_depay_class);
GstRTPBaseDepayloadClass *depay_class =
(GstRTPBaseDepayloadClass *) (gst_rtp_vp8_depay_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_rtp_vp8_depay_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_rtp_vp8_depay_src_template));
gst_element_class_set_static_metadata (element_class, "RTP VP8 depayloader",
"Codec/Depayloader/Network/RTP",
"Extracts VP8 video from RTP packets)",
"Sjoerd Simons <sjoerd@luon.net>");
object_class->dispose = gst_rtp_vp8_depay_dispose;
depay_class->process = gst_rtp_vp8_depay_process;
depay_class->set_caps = gst_rtp_vp8_depay_set_caps;
GST_DEBUG_CATEGORY_INIT (gst_rtp_vp8_depay_debug, "rtpvp8depay", 0,
"VP8 Video RTP Depayloader");
}
static void
gst_rtp_vp8_depay_dispose (GObject * object)
{
GstRtpVP8Depay *self = GST_RTP_VP8_DEPAY (object);
if (self->adapter != NULL)
g_object_unref (self->adapter);
self->adapter = NULL;
/* release any references held by the object here */
if (G_OBJECT_CLASS (gst_rtp_vp8_depay_parent_class)->dispose)
G_OBJECT_CLASS (gst_rtp_vp8_depay_parent_class)->dispose (object);
}
static GstBuffer *
gst_rtp_vp8_depay_process (GstRTPBaseDepayload * depay, GstBuffer * buf)
{
GstRtpVP8Depay *self = GST_RTP_VP8_DEPAY (depay);
GstBuffer *payload;
guint8 *data;
guint hdrsize;
guint size;
GstRTPBuffer rtpbuffer = GST_RTP_BUFFER_INIT;
if (G_UNLIKELY (GST_BUFFER_IS_DISCONT (buf))) {
GST_LOG_OBJECT (self, "Discontinuity, flushing adapter");
gst_adapter_clear (self->adapter);
self->started = FALSE;
}
gst_rtp_buffer_map (buf, GST_MAP_READ, &rtpbuffer);
size = gst_rtp_buffer_get_payload_len (&rtpbuffer);
/* At least one header and one vp8 byte */
if (G_UNLIKELY (size < 2))
goto too_small;
data = gst_rtp_buffer_get_payload (&rtpbuffer);
if (G_UNLIKELY (!self->started)) {
/* Check if this is the start of a VP8 frame, otherwise bail */
/* S=1 and PartID= 0 */
if ((data[0] & 0x1F) != 0x10)
goto done;
self->started = TRUE;
}
hdrsize = 1;
/* Check X optional header */
if ((data[0] & 0x80) != 0) {
hdrsize++;
/* Check I optional header */
if ((data[1] & 0x80) != 0) {
if (G_UNLIKELY (size < 3))
goto too_small;
hdrsize++;
/* Check for 16 bits PictureID */
if ((data[2] & 0x80) != 0)
hdrsize++;
}
/* Check L optional header */
if ((data[1] & 0x40) != 0)
hdrsize++;
/* Check T or K optional headers */
if ((data[1] & 0x20) != 0 || (data[1] & 0x10) != 0)
hdrsize++;
}
GST_DEBUG_OBJECT (depay, "hdrsize %u, size %u", hdrsize, size);
if (G_UNLIKELY (hdrsize >= size))
goto too_small;
payload = gst_rtp_buffer_get_payload_subbuffer (&rtpbuffer, hdrsize, -1);
gst_adapter_push (self->adapter, payload);
/* Marker indicates that it was the last rtp packet for this frame */
if (gst_rtp_buffer_get_marker (&rtpbuffer)) {
GstBuffer *out;
guint8 flag0;
gst_adapter_copy (self->adapter, &flag0, 0, 1);
out = gst_adapter_take_buffer (self->adapter,
gst_adapter_available (self->adapter));
self->started = FALSE;
gst_rtp_buffer_unmap (&rtpbuffer);
/* mark keyframes */
out = gst_buffer_make_writable (out);
if ((flag0 & 0x01))
GST_BUFFER_FLAG_SET (out, GST_BUFFER_FLAG_DELTA_UNIT);
else
GST_BUFFER_FLAG_UNSET (out, GST_BUFFER_FLAG_DELTA_UNIT);
return out;
}
done:
gst_rtp_buffer_unmap (&rtpbuffer);
return NULL;
too_small:
GST_LOG_OBJECT (self, "Invalid rtp packet (too small), ignoring");
gst_adapter_clear (self->adapter);
self->started = FALSE;
goto done;
}
static gboolean
gst_rtp_vp8_depay_set_caps (GstRTPBaseDepayload * depayload, GstCaps * caps)
{
GstCaps *srccaps = gst_caps_new_simple ("video/x-vp8",
"framerate", GST_TYPE_FRACTION, 0, 1,
NULL);
gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload), srccaps);
gst_caps_unref (srccaps);
return TRUE;
}
gboolean
gst_rtp_vp8_depay_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "rtpvp8depay",
GST_RANK_MARGINAL, GST_TYPE_RTP_VP8_DEPAY);
}