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gst/videorate/: Added a video timestamp corrector.

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Original commit message from CVS:
* gst/videorate/Makefile.am:
* gst/videorate/gstvideorate.c: (gst_videorate_get_type),
(gst_videorate_base_init), (gst_videorate_class_init),
(gst_videorate_getcaps), (gst_videorate_link),
(gst_videorate_init), (gst_videorate_chain),
(gst_videorate_set_property), (gst_videorate_get_property),
(gst_videorate_change_state), (plugin_init):
Added a video timestamp corrector.
This commit is contained in:
Wim Taymans 2004-06-16 09:39:02 +00:00
parent 9ca805fb93
commit 17c1c603f9
3 changed files with 451 additions and 0 deletions
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11
ChangeLog
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@ -1,3 +1,14 @@
2004-06-16 Wim Taymans <wim@fluendo.com>
* gst/videorate/Makefile.am:
* gst/videorate/gstvideorate.c: (gst_videorate_get_type),
(gst_videorate_base_init), (gst_videorate_class_init),
(gst_videorate_getcaps), (gst_videorate_link),
(gst_videorate_init), (gst_videorate_chain),
(gst_videorate_set_property), (gst_videorate_get_property),
(gst_videorate_change_state), (plugin_init):
Added a video timestamp corrector.
2004-06-15 Zaheer Abbas Merali <zaheerabbas at merali.org>
fixed a potential leak with previous commit

7
gst/videorate/Makefile.am Normal file
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@ -0,0 +1,7 @@
plugin_LTLIBRARIES = libgstvideorate.la
libgstvideorate_la_SOURCES = gstvideorate.c
libgstvideorate_la_CFLAGS = $(GST_CFLAGS)
libgstvideorate_la_LIBADD =
libgstvideorate_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)

433
gst/videorate/gstvideorate.c Normal file
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@ -0,0 +1,433 @@
/* 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 <gst/gst.h>
#include <gst/video/video.h>
#define GST_TYPE_VIDEORATE \
(gst_videorate_get_type())
#define GST_VIDEORATE(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_VIDEORATE,GstVideorate))
#define GST_VIDEORATE_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_VIDEORATE,GstVideorate))
#define GST_IS_VIDEORATE(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_VIDEORATE))
#define GST_IS_VIDEORATE_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_VIDEORATE))
typedef struct _GstVideorate GstVideorate;
typedef struct _GstVideorateClass GstVideorateClass;
struct _GstVideorate
{
GstElement element;
GstPad *sinkpad, *srcpad;
/* video state */
gdouble from_fps, to_fps;
guint64 next_ts;
GstBuffer *prevbuf;
guint64 in, out, dup, drop;
};
struct _GstVideorateClass
{
GstElementClass parent_class;
};
/* elementfactory information */
static GstElementDetails videorate_details =
GST_ELEMENT_DETAILS ("Video rate adjuster",
"Filter/Effect/Video",
"Drops/duplicates/adjusts timestamps on video frames to make a perfect stream",
"Wim Taymans <wim@fluendo.com>");
/* GstVideorate signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_IN,
ARG_OUT,
ARG_DUP,
ARG_DROP,
/* FILL ME */
};
static GstStaticPadTemplate gst_videorate_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_videorate_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_videorate_base_init (gpointer g_class);
static void gst_videorate_class_init (GstVideorateClass * klass);
static void gst_videorate_init (GstVideorate * videorate);
static void gst_videorate_chain (GstPad * pad, GstData * _data);
static void gst_videorate_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_videorate_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static GstElementStateReturn gst_videorate_change_state (GstElement * element);
static GstElementClass *parent_class = NULL;
/*static guint gst_videorate_signals[LAST_SIGNAL] = { 0 }; */
static GType
gst_videorate_get_type (void)
{
static GType videorate_type = 0;
if (!videorate_type) {
static const GTypeInfo videorate_info = {
sizeof (GstVideorateClass),
gst_videorate_base_init,
NULL,
(GClassInitFunc) gst_videorate_class_init,
NULL,
NULL,
sizeof (GstVideorate),
0,
(GInstanceInitFunc) gst_videorate_init,
};
videorate_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstVideorate", &videorate_info, 0);
}
return videorate_type;
}
static void
gst_videorate_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (element_class, &videorate_details);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_videorate_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_videorate_src_template));
}
static void
gst_videorate_class_init (GstVideorateClass * 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_IN,
g_param_spec_uint64 ("in", "In",
"Number of input frames", 0, G_MAXUINT64, 0, G_PARAM_READABLE));
g_object_class_install_property (object_class, ARG_OUT,
g_param_spec_uint64 ("out", "Out",
"Number of output frames", 0, G_MAXUINT64, 0, G_PARAM_READABLE));
g_object_class_install_property (object_class, ARG_DUP,
g_param_spec_uint64 ("duplicate", "Duplicate",
"Number of duplicated frames", 0, G_MAXUINT64, 0, G_PARAM_READABLE));
g_object_class_install_property (object_class, ARG_DROP,
g_param_spec_uint64 ("drop", "Drop",
"Number of dropped frames", 0, G_MAXUINT64, 0, G_PARAM_READABLE));
object_class->set_property = gst_videorate_set_property;
object_class->get_property = gst_videorate_get_property;
element_class->change_state = gst_videorate_change_state;
}
static GstCaps *
gst_videorate_getcaps (GstPad * pad)
{
GstVideorate *videorate;
GstPad *otherpad;
GstCaps *caps, *copy, *copy2 = NULL;
int i;
gdouble otherfps;
GstStructure *structure;
gboolean negotiated;
videorate = GST_VIDEORATE (gst_pad_get_parent (pad));
otherpad = (pad == videorate->srcpad) ? videorate->sinkpad :
videorate->srcpad;
negotiated = gst_pad_is_negotiated (otherpad);
otherfps = (pad == videorate->srcpad) ? videorate->from_fps :
videorate->to_fps;
caps = gst_pad_get_allowed_caps (otherpad);
copy = gst_caps_copy (caps);
if (negotiated) {
copy2 = gst_caps_copy (caps);
}
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);
}
if ((negotiated)) {
for (i = 0; i < gst_caps_get_size (copy2); i++) {
structure = gst_caps_get_structure (copy2, i);
gst_structure_set (structure, "framerate", G_TYPE_DOUBLE, otherfps, NULL);
}
gst_caps_append (copy2, copy);
copy = copy2;
}
gst_caps_append (copy, caps);
return copy;
}
static GstPadLinkReturn
gst_videorate_link (GstPad * pad, const GstCaps * caps)
{
GstVideorate *videorate;
GstStructure *structure;
gboolean ret;
double fps;
GstPad *otherpad;
videorate = GST_VIDEORATE (gst_pad_get_parent (pad));
otherpad = (pad == videorate->srcpad) ? videorate->sinkpad :
videorate->srcpad;
structure = gst_caps_get_structure (caps, 0);
ret = gst_structure_get_double (structure, "framerate", &fps);
if (!ret)
return GST_PAD_LINK_REFUSED;
if (pad == videorate->srcpad) {
videorate->to_fps = fps;
} else {
videorate->from_fps = fps;
}
if (gst_pad_is_negotiated (otherpad)) {
/*
* Ensure that the other side talks the format we're trying to set
*/
GstCaps *newcaps = gst_caps_copy (caps);
if (pad == videorate->srcpad) {
gst_caps_set_simple (newcaps,
"framerate", G_TYPE_DOUBLE, videorate->from_fps, NULL);
} else {
gst_caps_set_simple (newcaps,
"framerate", G_TYPE_DOUBLE, videorate->to_fps, NULL);
}
ret = gst_pad_try_set_caps (otherpad, newcaps);
if (GST_PAD_LINK_FAILED (ret)) {
return GST_PAD_LINK_REFUSED;
}
}
return GST_PAD_LINK_OK;
}
static void
gst_videorate_init (GstVideorate * videorate)
{
GST_FLAG_SET (videorate, GST_ELEMENT_EVENT_AWARE);
GST_DEBUG ("gst_videorate_init");
videorate->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&gst_videorate_sink_template), "sink");
gst_element_add_pad (GST_ELEMENT (videorate), videorate->sinkpad);
gst_pad_set_chain_function (videorate->sinkpad, gst_videorate_chain);
gst_pad_set_getcaps_function (videorate->sinkpad, gst_videorate_getcaps);
gst_pad_set_link_function (videorate->sinkpad, gst_videorate_link);
videorate->srcpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&gst_videorate_src_template), "src");
gst_element_add_pad (GST_ELEMENT (videorate), videorate->srcpad);
gst_pad_set_getcaps_function (videorate->srcpad, gst_videorate_getcaps);
gst_pad_set_link_function (videorate->srcpad, gst_videorate_link);
videorate->prevbuf = NULL;
videorate->in = 0;
videorate->out = 0;
videorate->drop = 0;
videorate->dup = 0;
}
static void
gst_videorate_chain (GstPad * pad, GstData * data)
{
GstVideorate *videorate = GST_VIDEORATE (gst_pad_get_parent (pad));
GstBuffer *buf;
if (GST_IS_EVENT (data)) {
GstEvent *event = GST_EVENT (data);
gst_pad_event_default (pad, event);
return;
}
buf = GST_BUFFER (data);
/* pull in 2 buffers */
if (videorate->prevbuf == NULL) {
videorate->prevbuf = buf;
} else {
GstClockTime prevtime, intime;
gint count = 0;
gint64 diff1, diff2;
prevtime = GST_BUFFER_TIMESTAMP (videorate->prevbuf);
intime = GST_BUFFER_TIMESTAMP (buf);
videorate->in++;
/* got 2 buffers, see which one is the best */
do {
diff1 = abs (prevtime - videorate->next_ts);
diff2 = abs (intime - videorate->next_ts);
/* output first one when its the best */
if (diff1 <= diff2) {
GstBuffer *outbuf;
count++;
outbuf =
gst_buffer_create_sub (videorate->prevbuf, 0,
GST_BUFFER_SIZE (videorate->prevbuf));
GST_BUFFER_TIMESTAMP (outbuf) = videorate->next_ts;
videorate->out++;
videorate->next_ts = videorate->out / videorate->to_fps * GST_SECOND;
GST_BUFFER_DURATION (outbuf) =
videorate->next_ts - GST_BUFFER_TIMESTAMP (outbuf);
gst_pad_push (videorate->srcpad, GST_DATA (outbuf));
}
/* continue while the first one was the best */
}
while (diff1 <= diff2);
/* if we outputed the first buffer more then once, we have dups */
if (count > 1)
videorate->dup += count - 1;
/* if we didn't output the first buffer, we have a drop */
else if (count == 0)
videorate->drop++;
// g_print ("swap: diff1 %lld, diff2 %lld, in %d, out %d, drop %d, dup %d\n", diff1, diff2,
// videorate->in, videorate->out, videorate->drop, videorate->dup);
/* swap in new one when it's the best */
gst_buffer_unref (videorate->prevbuf);
videorate->prevbuf = buf;
}
}
static void
gst_videorate_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
//GstVideorate *videorate = GST_VIDEORATE (object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_videorate_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstVideorate *videorate = GST_VIDEORATE (object);
switch (prop_id) {
case ARG_IN:
g_value_set_uint64 (value, videorate->in);
break;
case ARG_OUT:
g_value_set_uint64 (value, videorate->out);
break;
case ARG_DUP:
g_value_set_uint64 (value, videorate->dup);
break;
case ARG_DROP:
g_value_set_uint64 (value, videorate->drop);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstElementStateReturn
gst_videorate_change_state (GstElement * element)
{
//GstVideorate *videorate = GST_VIDEORATE (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_PAUSED_TO_READY:
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, "videorate", GST_RANK_NONE,
GST_TYPE_VIDEORATE);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"videorate",
"Adjusts video frames",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)