gstreamer/gst/videorate/gstvideorate.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 <gst/gst.h>
GST_DEBUG_CATEGORY (videorate_debug);
#define GST_CAT_DEFAULT videorate_debug
#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;
guint64 first_ts;
GstBuffer *prevbuf;
guint64 in, out, dup, drop;
gboolean silent;
gdouble new_pref;
};
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
};
#define DEFAULT_SILENT TRUE
#define DEFAULT_NEW_PREF 1.0
enum
{
ARG_0,
ARG_IN,
ARG_OUT,
ARG_DUP,
ARG_DROP,
ARG_SILENT,
ARG_NEW_PREF,
/* FILL ME */
};
static GstStaticPadTemplate gst_videorate_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw-yuv; video/x-raw-rgb")
);
static GstStaticPadTemplate gst_videorate_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw-yuv; video/x-raw-rgb")
);
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 gboolean gst_videorate_event (GstPad * pad, GstEvent * event);
static GstFlowReturn gst_videorate_chain (GstPad * pad, GstBuffer * buffer);
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);
object_class->set_property = gst_videorate_set_property;
object_class->get_property = gst_videorate_get_property;
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));
g_object_class_install_property (object_class, ARG_SILENT,
g_param_spec_boolean ("silent", "silent",
"Don't emit notify for dropped and duplicated frames",
DEFAULT_SILENT, G_PARAM_READWRITE));
g_object_class_install_property (object_class, ARG_NEW_PREF,
g_param_spec_double ("new_pref", "New Pref",
"Value indicating how much to prefer new frames",
0.0, 1.0, DEFAULT_NEW_PREF, G_PARAM_READWRITE));
element_class->change_state = gst_videorate_change_state;
}
/* return the caps that can be used on out_pad given in_caps on in_pad */
static gboolean
gst_videorate_transformcaps (GstPad * in_pad, GstCaps * in_caps,
GstPad * out_pad, GstCaps ** out_caps)
{
GstCaps *intersect;
const GstCaps *in_templ;
gint i;
in_templ = gst_pad_get_pad_template_caps (in_pad);
intersect = gst_caps_intersect (in_caps, in_templ);
/* all possible framerates are allowed */
for (i = 0; i < gst_caps_get_size (intersect); i++) {
GstStructure *structure;
structure = gst_caps_get_structure (intersect, i);
gst_structure_set (structure,
"framerate", GST_TYPE_DOUBLE_RANGE, 0.0, G_MAXDOUBLE, NULL);
}
*out_caps = intersect;
return TRUE;
}
static GstCaps *
gst_videorate_getcaps (GstPad * pad)
{
GstVideorate *videorate;
GstPad *otherpad;
GstCaps *caps;
videorate = GST_VIDEORATE (GST_PAD_PARENT (pad));
otherpad = (pad == videorate->srcpad) ? videorate->sinkpad :
videorate->srcpad;
/* we can do what the peer can */
caps = gst_pad_peer_get_caps (otherpad);
if (caps) {
GstCaps *transform;
gst_videorate_transformcaps (otherpad, caps, pad, &transform);
gst_caps_unref (caps);
caps = transform;
} else {
/* no peer, our padtemplate is enough then */
caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
}
return caps;
}
static gboolean
gst_videorate_setcaps (GstPad * pad, GstCaps * caps)
{
GstVideorate *videorate;
GstStructure *structure;
gboolean ret = TRUE;
double fps;
GstPad *otherpad, *opeer;
videorate = GST_VIDEORATE (GST_PAD_PARENT (pad));
structure = gst_caps_get_structure (caps, 0);
if (!(ret = gst_structure_get_double (structure, "framerate", &fps)))
goto done;
if (pad == videorate->srcpad) {
videorate->to_fps = fps;
otherpad = videorate->sinkpad;
} else {
videorate->from_fps = fps;
otherpad = videorate->srcpad;
}
/* now try to find something for the peer */
opeer = gst_pad_get_peer (otherpad);
if (opeer) {
if (gst_pad_accept_caps (opeer, caps)) {
/* the peer accepts the caps as they are */
gst_pad_set_caps (otherpad, caps);
ret = TRUE;
} else {
GstCaps *peercaps;
GstCaps *intersect;
GstCaps *transform = NULL;
ret = FALSE;
/* see how we can transform the input caps */
if (!gst_videorate_transformcaps (pad, caps, otherpad, &transform))
goto done;
/* see what the peer can do */
peercaps = gst_pad_get_caps (opeer);
GST_DEBUG ("icaps %" GST_PTR_FORMAT, peercaps);
GST_DEBUG ("transform %" GST_PTR_FORMAT, transform);
/* filter against our possibilities */
intersect = gst_caps_intersect (peercaps, transform);
gst_caps_unref (peercaps);
gst_caps_unref (transform);
GST_DEBUG ("intersect %" GST_PTR_FORMAT, intersect);
/* take first possibility */
caps = gst_caps_copy_nth (intersect, 0);
gst_caps_unref (intersect);
structure = gst_caps_get_structure (caps, 0);
/* and fixate */
gst_caps_structure_fixate_field_nearest_int (structure, "framerate", fps);
gst_structure_get_double (structure, "framerate", &fps);
if (otherpad == videorate->srcpad) {
videorate->to_fps = fps;
} else {
videorate->from_fps = fps;
}
gst_pad_set_caps (otherpad, caps);
ret = TRUE;
}
gst_object_unref (opeer);
}
done:
return ret;
}
static void
gst_videorate_blank_data (GstVideorate * videorate)
{
GST_DEBUG ("resetting data");
if (videorate->prevbuf)
gst_buffer_unref (videorate->prevbuf);
videorate->prevbuf = NULL;
videorate->from_fps = 0;
videorate->to_fps = 0;
videorate->in = 0;
videorate->out = 0;
videorate->drop = 0;
videorate->dup = 0;
videorate->next_ts = 0LL;
videorate->first_ts = 0LL;
}
static void
gst_videorate_init (GstVideorate * videorate)
{
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_event_function (videorate->sinkpad, gst_videorate_event);
gst_pad_set_chain_function (videorate->sinkpad, gst_videorate_chain);
gst_pad_set_getcaps_function (videorate->sinkpad, gst_videorate_getcaps);
gst_pad_set_setcaps_function (videorate->sinkpad, gst_videorate_setcaps);
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_setcaps_function (videorate->srcpad, gst_videorate_setcaps);
gst_videorate_blank_data (videorate);
videorate->silent = DEFAULT_SILENT;
videorate->new_pref = DEFAULT_NEW_PREF;
}
static GstFlowReturn
gst_videorate_event (GstPad * pad, GstEvent * event)
{
GstVideorate *videorate;
videorate = GST_VIDEORATE (GST_PAD_PARENT (pad));
if (!videorate->prevbuf)
goto done;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_DISCONTINUOUS:
{
gint64 start, end;
GST_STREAM_LOCK (pad);
if (!(gst_event_discont_get_value (event, GST_FORMAT_TIME, &start, &end)))
GST_WARNING ("Got discont but doesn't have GST_FORMAT_TIME value");
else {
gst_videorate_blank_data (videorate);
videorate->first_ts = start;
}
GST_STREAM_UNLOCK (pad);
break;
}
default:
break;
}
done:
return gst_pad_event_default (pad, event);
}
static GstFlowReturn
gst_videorate_chain (GstPad * pad, GstBuffer * buffer)
{
GstVideorate *videorate;
GstFlowReturn res = GST_FLOW_OK;
videorate = GST_VIDEORATE (GST_PAD_PARENT (pad));
if (videorate->from_fps == 0)
return GST_FLOW_NOT_NEGOTIATED;
if (videorate->to_fps == 0)
return GST_FLOW_NOT_NEGOTIATED;
/* pull in 2 buffers */
if (videorate->prevbuf == NULL) {
/* We're sure it's a GstBuffer here */
videorate->prevbuf = buffer;
videorate->next_ts = videorate->first_ts = GST_BUFFER_TIMESTAMP (buffer);
} else {
GstClockTime prevtime, intime;
gint count = 0;
gint64 diff1, diff2;
prevtime = GST_BUFFER_TIMESTAMP (videorate->prevbuf);
/* If it's a GstEvent, we give him the time of the next outputed frame */
#if 0
intime = (GST_IS_EVENT (data))
? videorate->next_ts +
(1 / videorate->to_fps * GST_SECOND) : GST_BUFFER_TIMESTAMP (buffer);
#endif
intime = GST_BUFFER_TIMESTAMP (buffer);
GST_LOG_OBJECT (videorate,
"prev buf %" GST_TIME_FORMAT " new buf %" GST_TIME_FORMAT
" outgoing ts %" GST_TIME_FORMAT, GST_TIME_ARGS (prevtime),
GST_TIME_ARGS (intime), GST_TIME_ARGS (videorate->next_ts));
videorate->in++;
/* got 2 buffers, see which one is the best */
do {
diff1 = prevtime - videorate->next_ts;
diff2 = intime - videorate->next_ts;
/* take absolute values, beware: abs and ABS don't work for gint64 */
if (diff1 < 0)
diff1 = -diff1;
if (diff2 < 0)
diff2 = -diff2;
GST_LOG_OBJECT (videorate,
"diff with prev %" GST_TIME_FORMAT " diff with new %"
GST_TIME_FORMAT " outgoing ts %" GST_TIME_FORMAT,
GST_TIME_ARGS (diff1), GST_TIME_ARGS (diff2),
GST_TIME_ARGS (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->first_ts +
(videorate->out / videorate->to_fps * GST_SECOND);
GST_BUFFER_DURATION (outbuf) =
videorate->next_ts - GST_BUFFER_TIMESTAMP (outbuf);
gst_buffer_set_caps (outbuf, GST_PAD_CAPS (videorate->srcpad));
if ((res = gst_pad_push (videorate->srcpad, outbuf)) != GST_FLOW_OK)
goto done;
GST_LOG_OBJECT (videorate,
"old is best, dup, outgoing ts %" GST_TIME_FORMAT,
GST_TIME_ARGS (videorate->next_ts));
}
/* 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 (!videorate->silent)
g_object_notify (G_OBJECT (videorate), "duplicate");
}
/* if we didn't output the first buffer, we have a drop */
else if (count == 0) {
videorate->drop++;
if (!videorate->silent)
g_object_notify (G_OBJECT (videorate), "drop");
GST_LOG_OBJECT (videorate,
"new is best, old never used, drop, outgoing ts %"
GST_TIME_FORMAT, GST_TIME_ARGS (videorate->next_ts));
}
GST_LOG_OBJECT (videorate,
"left loop, putting new in old, diff1 %" GST_TIME_FORMAT
", diff2 %" GST_TIME_FORMAT ", next_ts %" GST_TIME_FORMAT
", in %lld, out %lld, drop %lld, dup %lld", GST_TIME_ARGS (diff1),
GST_TIME_ARGS (diff2), GST_TIME_ARGS (videorate->next_ts),
videorate->in, videorate->out, videorate->drop, videorate->dup);
/* swap in new one when it's the best */
gst_buffer_unref (videorate->prevbuf);
videorate->prevbuf = buffer;
}
done:
return res;
}
static void
gst_videorate_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstVideorate *videorate = GST_VIDEORATE (object);
switch (prop_id) {
case ARG_SILENT:
videorate->silent = g_value_get_boolean (value);
break;
case ARG_NEW_PREF:
videorate->new_pref = g_value_get_double (value);
break;
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;
case ARG_SILENT:
g_value_set_boolean (value, videorate->silent);
break;
case ARG_NEW_PREF:
g_value_set_double (value, videorate->new_pref);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstElementStateReturn
gst_videorate_change_state (GstElement * element)
{
GstElementStateReturn ret;
GstVideorate *videorate;
gint transition;
videorate = GST_VIDEORATE (element);
transition = GST_STATE_TRANSITION (videorate);
switch (transition) {
default:
break;
}
ret = parent_class->change_state (element);
switch (transition) {
case GST_STATE_PAUSED_TO_READY:
gst_videorate_blank_data (videorate);
break;
default:
break;
}
return ret;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (videorate_debug, "videorate", 0,
"Videorate stream fixer");
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)