gstreamer/gst/videodrop/gstvideodrop.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gstvideodrop.h>
#include <gst/video/video.h>
/* elementfactory information */
static GstElementDetails videodrop_details =
GST_ELEMENT_DETAILS ("Video frame dropper",
"Filter/Effect/Video",
"Re-FPS'es video",
"Ronald Bultje <rbultje@ronald.bitfreak.net>");
/* GstVideodrop signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_SPEED
/* FILL ME */
};
static GstStaticPadTemplate gst_videodrop_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("{ YUY2, I420, YV12, YUYV, UYVY }")
)
);
static GstStaticPadTemplate gst_videodrop_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("{ YUY2, I420, YV12, YUYV, UYVY }")
)
);
static void gst_videodrop_base_init (gpointer g_class);
static void gst_videodrop_class_init (GstVideodropClass * klass);
static void gst_videodrop_init (GstVideodrop * videodrop);
static void gst_videodrop_chain (GstPad * pad, GstData * _data);
static void gst_videodrop_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_videodrop_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static GstElementStateReturn gst_videodrop_change_state (GstElement * element);
static GstElementClass *parent_class = NULL;
/*static guint gst_videodrop_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_videodrop_get_type (void)
{
static GType videodrop_type = 0;
if (!videodrop_type) {
static const GTypeInfo videodrop_info = {
sizeof (GstVideodropClass),
gst_videodrop_base_init,
NULL,
(GClassInitFunc) gst_videodrop_class_init,
NULL,
NULL,
sizeof (GstVideodrop),
0,
(GInstanceInitFunc) gst_videodrop_init,
};
videodrop_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstVideodrop", &videodrop_info, 0);
}
return videodrop_type;
}
static void
gst_videodrop_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (element_class, &videodrop_details);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_videodrop_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_videodrop_src_template));
}
static void
gst_videodrop_class_init (GstVideodropClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
g_object_class_install_property (object_class, ARG_SPEED,
g_param_spec_float ("speed", "Speed",
"Output speed (relative to input)", 0.01, 100, 1, G_PARAM_READWRITE));
object_class->set_property = gst_videodrop_set_property;
object_class->get_property = gst_videodrop_get_property;
element_class->change_state = gst_videodrop_change_state;
}
static GstCaps *
gst_videodrop_getcaps (GstPad * pad)
{
GstVideodrop *videodrop;
GstPad *otherpad;
GstCaps *caps;
int i;
GstStructure *structure;
videodrop = GST_VIDEODROP (gst_pad_get_parent (pad));
otherpad = (pad == videodrop->srcpad) ? videodrop->sinkpad :
videodrop->srcpad;
caps = gst_pad_get_allowed_caps (otherpad);
for (i = 0; i < gst_caps_get_size (caps); i++) {
structure = gst_caps_get_structure (caps, i);
gst_structure_set (structure,
"framerate", GST_TYPE_DOUBLE_RANGE, 0.0, G_MAXDOUBLE, NULL);
}
return caps;
}
static GstPadLinkReturn
gst_videodrop_link (GstPad * pad, const GstCaps * caps)
{
GstVideodrop *videodrop;
GstStructure *structure;
GstPadLinkReturn link_ret;
gboolean ret;
double fps;
double otherfps;
GstPad *otherpad;
GstCaps *othercaps;
videodrop = GST_VIDEODROP (gst_pad_get_parent (pad));
otherpad = (pad == videodrop->srcpad) ? videodrop->sinkpad :
videodrop->srcpad;
structure = gst_caps_get_structure (caps, 0);
ret = gst_structure_get_double (structure, "framerate", &fps);
if (!ret)
return GST_PAD_LINK_REFUSED;
if (gst_pad_is_negotiated (otherpad)) {
othercaps = gst_caps_copy (caps);
if (pad == videodrop->srcpad) {
otherfps = videodrop->from_fps;
} else {
otherfps = videodrop->to_fps;
}
gst_caps_set_simple (othercaps, "framerate", G_TYPE_DOUBLE, otherfps, NULL);
link_ret = gst_pad_try_set_caps (otherpad, othercaps);
if (GST_PAD_LINK_FAILED (link_ret)) {
return link_ret;
}
}
if (pad == videodrop->srcpad) {
videodrop->to_fps = fps;
} else {
videodrop->from_fps = fps;
}
return GST_PAD_LINK_OK;
}
static void
gst_videodrop_init (GstVideodrop * videodrop)
{
GST_FLAG_SET (videodrop, GST_ELEMENT_EVENT_AWARE);
GST_DEBUG ("gst_videodrop_init");
videodrop->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&gst_videodrop_sink_template), "sink");
gst_element_add_pad (GST_ELEMENT (videodrop), videodrop->sinkpad);
gst_pad_set_chain_function (videodrop->sinkpad, gst_videodrop_chain);
gst_pad_set_getcaps_function (videodrop->sinkpad, gst_videodrop_getcaps);
gst_pad_set_link_function (videodrop->sinkpad, gst_videodrop_link);
videodrop->srcpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&gst_videodrop_src_template), "src");
gst_element_add_pad (GST_ELEMENT (videodrop), videodrop->srcpad);
gst_pad_set_getcaps_function (videodrop->srcpad, gst_videodrop_getcaps);
gst_pad_set_link_function (videodrop->srcpad, gst_videodrop_link);
videodrop->inited = FALSE;
videodrop->total = videodrop->pass = 0;
videodrop->speed = 1.;
videodrop->time_adjust = 0;
}
static void
gst_videodrop_chain (GstPad * pad, GstData * data)
{
GstVideodrop *videodrop = GST_VIDEODROP (gst_pad_get_parent (pad));
GstBuffer *buf;
if (GST_IS_EVENT (data)) {
GstEvent *event = GST_EVENT (data);
if (GST_EVENT_TYPE (event) == GST_EVENT_DISCONTINUOUS) {
/* since we rely on timestamps of the source, we need to handle
* changes in time carefully. */
gint64 time;
if (gst_event_discont_get_value (event, GST_FORMAT_TIME, &time)) {
videodrop->time_adjust = time;
videodrop->total = videodrop->pass = 0;
} else {
GST_ELEMENT_ERROR (videodrop, STREAM, TOO_LAZY, (NULL),
("Received discont, but no time information"));
gst_event_unref (event);
return;
}
}
gst_pad_event_default (pad, event);
return;
}
buf = GST_BUFFER (data);
videodrop->total++;
while (((GST_BUFFER_TIMESTAMP (buf) - videodrop->time_adjust) *
videodrop->to_fps * videodrop->speed / GST_SECOND) >=
videodrop->pass) {
/* since we write to the struct (time/duration), we need a new struct,
* but we don't want to copy around data - a subbuffer is the easiest
* way to accomplish that... */
GstBuffer *copy = gst_buffer_create_sub (buf, 0, GST_BUFFER_SIZE (buf));
/* adjust timestamp/duration and push forward */
GST_BUFFER_TIMESTAMP (copy) = videodrop->time_adjust / videodrop->speed +
GST_SECOND * videodrop->pass / videodrop->to_fps;
GST_BUFFER_DURATION (copy) = GST_SECOND / videodrop->to_fps;
gst_pad_push (videodrop->srcpad, GST_DATA (copy));
videodrop->pass++;
}
gst_buffer_unref (buf);
}
static void
gst_videodrop_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstVideodrop *videodrop = GST_VIDEODROP (object);
switch (prop_id) {
case ARG_SPEED:
videodrop->speed = g_value_get_float (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_videodrop_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstVideodrop *videodrop = GST_VIDEODROP (object);
switch (prop_id) {
case ARG_SPEED:
g_value_set_float (value, videodrop->speed);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstElementStateReturn
gst_videodrop_change_state (GstElement * element)
{
GstVideodrop *videodrop = GST_VIDEODROP (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_PAUSED_TO_READY:
videodrop->inited = FALSE;
videodrop->time_adjust = 0;
videodrop->total = videodrop->pass = 0;
break;
default:
break;
}
if (parent_class->change_state)
return parent_class->change_state (element);
return GST_STATE_SUCCESS;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "videodrop", GST_RANK_NONE,
GST_TYPE_VIDEODROP);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"videodrop",
"Re-FPS'es video",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)