gstreamer/gst/rtp/gstrtpvp8depay.c

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/* 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"
#include "gstrtputils.h"
#include <gst/video/video.h>
#include <stdio.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,
GstRTPBuffer * rtp);
static GstStateChangeReturn gst_rtp_vp8_depay_change_state (GstElement *
element, GstStateChange transition);
static gboolean gst_rtp_vp8_depay_handle_event (GstRTPBaseDepayload * depay,
GstEvent * event);
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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
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gst_rtp_vp8_depay_init (GstRtpVP8Depay * self)
{
self->adapter = gst_adapter_new ();
self->started = FALSE;
}
static void
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gst_rtp_vp8_depay_class_init (GstRtpVP8DepayClass * gst_rtp_vp8_depay_class)
{
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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_static_pad_template (element_class,
&gst_rtp_vp8_depay_sink_template);
gst_element_class_add_static_pad_template (element_class,
&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;
element_class->change_state = gst_rtp_vp8_depay_change_state;
depay_class->process_rtp_packet = gst_rtp_vp8_depay_process;
depay_class->handle_event = gst_rtp_vp8_depay_handle_event;
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 */
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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, GstRTPBuffer * rtp)
{
GstRtpVP8Depay *self = GST_RTP_VP8_DEPAY (depay);
GstBuffer *payload;
guint8 *data;
guint hdrsize;
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guint size;
if (G_UNLIKELY (GST_BUFFER_IS_DISCONT (rtp->buffer))) {
GST_LOG_OBJECT (self, "Discontinuity, flushing adapter");
gst_adapter_clear (self->adapter);
self->started = FALSE;
}
size = gst_rtp_buffer_get_payload_len (rtp);
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/* At least one header and one vp8 byte */
if (G_UNLIKELY (size < 2))
goto too_small;
data = gst_rtp_buffer_get_payload (rtp);
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] & 0x17) != 0x10)
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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 (rtp, 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 (rtp)) {
GstBuffer *out;
guint8 header[10];
if (gst_adapter_available (self->adapter) < 10)
goto too_small;
gst_adapter_copy (self->adapter, &header, 0, 10);
out = gst_adapter_take_buffer (self->adapter,
gst_adapter_available (self->adapter));
self->started = FALSE;
/* mark keyframes */
out = gst_buffer_make_writable (out);
/* Filter away all metas that are not sensible to copy */
gst_rtp_drop_meta (GST_ELEMENT_CAST (self), out,
g_quark_from_static_string (GST_META_TAG_VIDEO_STR));
if ((header[0] & 0x01)) {
GST_BUFFER_FLAG_SET (out, GST_BUFFER_FLAG_DELTA_UNIT);
if (!self->caps_sent) {
gst_buffer_unref (out);
out = NULL;
GST_INFO_OBJECT (self, "Dropping inter-frame before intra-frame");
gst_pad_push_event (GST_RTP_BASE_DEPAYLOAD_SINKPAD (depay),
gst_video_event_new_upstream_force_key_unit (GST_CLOCK_TIME_NONE,
TRUE, 0));
}
} else {
guint profile, width, height;
GST_BUFFER_FLAG_UNSET (out, GST_BUFFER_FLAG_DELTA_UNIT);
profile = (header[0] & 0x0e) >> 1;
width = GST_READ_UINT16_LE (header + 6) & 0x3fff;
height = GST_READ_UINT16_LE (header + 8) & 0x3fff;
if (G_UNLIKELY (self->last_width != width ||
self->last_height != height || self->last_profile != profile)) {
gchar profile_str[3];
GstCaps *srccaps;
snprintf (profile_str, 3, "%u", profile);
srccaps = gst_caps_new_simple ("video/x-vp8",
"framerate", GST_TYPE_FRACTION, 0, 1,
"height", G_TYPE_INT, height,
"width", G_TYPE_INT, width,
"profile", G_TYPE_STRING, profile_str, NULL);
gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depay), srccaps);
gst_caps_unref (srccaps);
self->caps_sent = TRUE;
self->last_width = width;
self->last_height = height;
self->last_profile = profile;
}
}
return out;
}
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done:
return NULL;
too_small:
GST_LOG_OBJECT (self, "Invalid rtp packet (too small), ignoring");
gst_adapter_clear (self->adapter);
self->started = FALSE;
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goto done;
}
static GstStateChangeReturn
gst_rtp_vp8_depay_change_state (GstElement * element, GstStateChange transition)
{
GstRtpVP8Depay *self = GST_RTP_VP8_DEPAY (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
self->last_profile = -1;
self->last_height = -1;
self->last_width = -1;
self->caps_sent = FALSE;
break;
default:
break;
}
return
GST_ELEMENT_CLASS (gst_rtp_vp8_depay_parent_class)->change_state (element,
transition);
}
static gboolean
gst_rtp_vp8_depay_handle_event (GstRTPBaseDepayload * depay, GstEvent * event)
{
GstRtpVP8Depay *self = GST_RTP_VP8_DEPAY (depay);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
self->last_profile = -1;
self->last_height = -1;
self->last_width = -1;
break;
default:
break;
}
return
GST_RTP_BASE_DEPAYLOAD_CLASS
(gst_rtp_vp8_depay_parent_class)->handle_event (depay, event);
}
gboolean
gst_rtp_vp8_depay_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "rtpvp8depay",
GST_RANK_MARGINAL, GST_TYPE_RTP_VP8_DEPAY);
}