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gstreamer/gst/videomixer/videomixer.c
Sebastian Dröge abe4291d7a gst/videomixer/videomixer.*: duration and latency queries. 
Original commit message from CVS:
* gst/videomixer/videomixer.c: (gst_videomixer_reset),
(gst_videomixer_init), (gst_videomixer_query_duration),
(gst_videomixer_query_latency), (gst_videomixer_query),
(gst_videomixer_blend_buffers):
* gst/videomixer/videomixer.h:
Implement position (in time), duration and latency queries.
2008-05-28 08:36:44 +00:00

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/* Generic video mixer plugin
* Copyright (C) 2004 Wim Taymans <wim@fluendo.com>
*
* 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.
*/
/**
* SECTION:element-videomixer
* @short_description: Takes several AYUV video streams as input and mixes them
* together.
*
* <refsect2>
* <para>
* Videomixer can only accept AYUV video streams. For each of the requested
* sink pads it will compare the incoming geometry and framerate to define the
* output parameters. Indeed output video frames will have the geometry of the
* biggest incoming video stream and the framerate of the fastest incoming one.
* </para>
* <para>
* Individual parameters for each input stream can be configured on the
* #GstVideoMixerPad.
* </para>
* <title>Sample pipelines</title>
* <para>
* Here is a pipeline to demonstrate videomixer used together with videobox :
* <programlisting>
* gst-launch videotestsrc pattern=1 ! video/x-raw-yuv, framerate=\(fraction\)10/1, width=100, height=100 ! videobox border-alpha=0 alpha=0.5 top=-70 bottom=-70 right=-220 ! videomixer name=mix ! ffmpegcolorspace ! xvimagesink videotestsrc ! video/x-raw-yuv, framerate=\(fraction\)5/1, width=320, height=240 ! alpha alpha=0.7 ! mix.
* </programlisting>
* This should show a 320x240 pixels video test source with some transparency
* showing the background checker pattern. Another video test source with just
* the snow pattern of 100x100 pixels is overlayed on top of the first one on
* the left vertically centered with a small transparency showing the first
* video test source behind and the checker pattern under it. Note that the
* framerate of the output video is 10 frames per second.
* </para>
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/base/gstcollectpads.h>
#include <gst/controller/gstcontroller.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include "videomixer.h"
GST_DEBUG_CATEGORY_STATIC (gst_videomixer_debug);
#define GST_CAT_DEFAULT gst_videomixer_debug
#define GST_VIDEO_MIXER_GET_STATE_LOCK(mix) \
(GST_VIDEO_MIXER(mix)->state_lock)
#define GST_VIDEO_MIXER_STATE_LOCK(mix) \
(g_mutex_lock(GST_VIDEO_MIXER_GET_STATE_LOCK (mix)))
#define GST_VIDEO_MIXER_STATE_UNLOCK(mix) \
(g_mutex_unlock(GST_VIDEO_MIXER_GET_STATE_LOCK (mix)))
static GType gst_videomixer_get_type (void);
static void gst_videomixer_pad_class_init (GstVideoMixerPadClass * klass);
static void gst_videomixer_pad_init (GstVideoMixerPad * mixerpad);
static void gst_videomixer_pad_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_videomixer_pad_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static gboolean gst_videomixer_src_event (GstPad * pad, GstEvent * event);
static gboolean gst_videomixer_sink_event (GstPad * pad, GstEvent * event);
static void gst_videomixer_sort_pads (GstVideoMixer * mix);
#define DEFAULT_PAD_ZORDER 0
#define DEFAULT_PAD_XPOS 0
#define DEFAULT_PAD_YPOS 0
#define DEFAULT_PAD_ALPHA 1.0
enum
{
ARG_PAD_0,
ARG_PAD_ZORDER,
ARG_PAD_XPOS,
ARG_PAD_YPOS,
ARG_PAD_ALPHA
};
static GType
gst_videomixer_pad_get_type (void)
{
static GType videomixer_pad_type = 0;
if (!videomixer_pad_type) {
static const GTypeInfo videomixer_pad_info = {
sizeof (GstVideoMixerPadClass),
NULL,
NULL,
(GClassInitFunc) gst_videomixer_pad_class_init,
NULL,
NULL,
sizeof (GstVideoMixerPad),
0,
(GInstanceInitFunc) gst_videomixer_pad_init,
};
videomixer_pad_type = g_type_register_static (GST_TYPE_PAD,
"GstVideoMixerPad", &videomixer_pad_info, 0);
}
return videomixer_pad_type;
}
static void
gst_videomixer_pad_class_init (GstVideoMixerPadClass * klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass *) klass;
gobject_class->set_property =
GST_DEBUG_FUNCPTR (gst_videomixer_pad_set_property);
gobject_class->get_property =
GST_DEBUG_FUNCPTR (gst_videomixer_pad_get_property);
g_object_class_install_property (gobject_class, ARG_PAD_ZORDER,
g_param_spec_uint ("zorder", "Z-Order", "Z Order of the picture",
0, 10000, DEFAULT_PAD_ZORDER,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
g_object_class_install_property (gobject_class, ARG_PAD_XPOS,
g_param_spec_int ("xpos", "X Position", "X Position of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_XPOS,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
g_object_class_install_property (gobject_class, ARG_PAD_YPOS,
g_param_spec_int ("ypos", "Y Position", "Y Position of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_YPOS,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
g_object_class_install_property (gobject_class, ARG_PAD_ALPHA,
g_param_spec_double ("alpha", "Alpha", "Alpha of the picture", 0.0, 1.0,
DEFAULT_PAD_ALPHA, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
}
static void
gst_videomixer_pad_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstVideoMixerPad *pad = GST_VIDEO_MIXER_PAD (object);
switch (prop_id) {
case ARG_PAD_ZORDER:
g_value_set_uint (value, pad->zorder);
break;
case ARG_PAD_XPOS:
g_value_set_int (value, pad->xpos);
break;
case ARG_PAD_YPOS:
g_value_set_int (value, pad->ypos);
break;
case ARG_PAD_ALPHA:
g_value_set_double (value, pad->alpha);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_videomixer_pad_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstVideoMixerPad *pad;
GstVideoMixer *mix;
pad = GST_VIDEO_MIXER_PAD (object);
mix = GST_VIDEO_MIXER (gst_pad_get_parent (GST_PAD (pad)));
switch (prop_id) {
case ARG_PAD_ZORDER:
GST_VIDEO_MIXER_STATE_LOCK (mix);
pad->zorder = g_value_get_uint (value);
gst_videomixer_sort_pads (mix);
GST_VIDEO_MIXER_STATE_UNLOCK (mix);
break;
case ARG_PAD_XPOS:
pad->xpos = g_value_get_int (value);
break;
case ARG_PAD_YPOS:
pad->ypos = g_value_get_int (value);
break;
case ARG_PAD_ALPHA:
pad->alpha = g_value_get_double (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
gst_object_unref (mix);
}
static void
gst_videomixer_set_master_geometry (GstVideoMixer * mix)
{
GSList *walk;
gint width = 0, height = 0, fps_n = 0, fps_d = 0;
GstVideoMixerPad *master = NULL;
walk = mix->sinkpads;
while (walk) {
GstVideoMixerPad *mixpad = GST_VIDEO_MIXER_PAD (walk->data);
walk = g_slist_next (walk);
/* Biggest input geometry will be our output geometry */
width = MAX (width, mixpad->in_width);
height = MAX (height, mixpad->in_height);
/* If mix framerate < mixpad framerate, using fractions */
GST_DEBUG_OBJECT (mix, "comparing framerate %d/%d to mixpad's %d/%d",
fps_n, fps_d, mixpad->fps_n, mixpad->fps_d);
if ((!fps_n && !fps_d) ||
((gint64) fps_n * mixpad->fps_d < (gint64) mixpad->fps_n * fps_d)) {
fps_n = mixpad->fps_n;
fps_d = mixpad->fps_d;
GST_DEBUG_OBJECT (mixpad, "becomes the master pad");
master = mixpad;
}
}
/* set results */
if (mix->master != master || mix->in_width != width
|| mix->in_height != height || mix->fps_n != fps_n
|| mix->fps_d != fps_d) {
mix->setcaps = TRUE;
mix->sendseg = TRUE;
mix->master = master;
mix->in_width = width;
mix->in_height = height;
mix->fps_n = fps_n;
mix->fps_d = fps_d;
}
}
static gboolean
gst_videomixer_pad_sink_setcaps (GstPad * pad, GstCaps * vscaps)
{
GstVideoMixer *mix;
GstVideoMixerPad *mixpad;
GstStructure *structure;
gint in_width, in_height;
gboolean ret = FALSE;
const GValue *framerate;
mix = GST_VIDEO_MIXER (gst_pad_get_parent (pad));
mixpad = GST_VIDEO_MIXER_PAD (pad);
if (!mixpad)
goto beach;
GST_DEBUG_OBJECT (mixpad, "setcaps triggered");
structure = gst_caps_get_structure (vscaps, 0);
if (!gst_structure_get_int (structure, "width", &in_width)
|| !gst_structure_get_int (structure, "height", &in_height)
|| (framerate = gst_structure_get_value (structure, "framerate")) == NULL)
goto beach;
GST_VIDEO_MIXER_STATE_LOCK (mix);
mixpad->fps_n = gst_value_get_fraction_numerator (framerate);
mixpad->fps_d = gst_value_get_fraction_denominator (framerate);
mixpad->in_width = in_width;
mixpad->in_height = in_height;
gst_videomixer_set_master_geometry (mix);
GST_VIDEO_MIXER_STATE_UNLOCK (mix);
ret = TRUE;
beach:
gst_object_unref (mix);
return ret;
}
static void
gst_videomixer_pad_link (GstPad * pad, GstPad * peer, gpointer data)
{
GST_DEBUG_OBJECT (pad, "connected");
}
static void
gst_videomixer_pad_unlink (GstPad * pad, GstPad * peer, gpointer data)
{
GST_DEBUG_OBJECT (pad, "unlinked");
}
static void
gst_videomixer_pad_init (GstVideoMixerPad * mixerpad)
{
g_signal_connect (mixerpad, "linked",
G_CALLBACK (gst_videomixer_pad_link), mixerpad);
g_signal_connect (mixerpad, "unlinked",
G_CALLBACK (gst_videomixer_pad_unlink), mixerpad);
/* setup some pad functions */
gst_pad_set_setcaps_function (GST_PAD (mixerpad),
gst_videomixer_pad_sink_setcaps);
mixerpad->zorder = DEFAULT_PAD_ZORDER;
mixerpad->xpos = DEFAULT_PAD_XPOS;
mixerpad->ypos = DEFAULT_PAD_YPOS;
mixerpad->alpha = DEFAULT_PAD_ALPHA;
}
/* elementfactory information */
static const GstElementDetails gst_videomixer_details =
GST_ELEMENT_DETAILS ("Video mixer",
"Filter/Editor/Video",
"Mix multiple video streams",
"Wim Taymans <wim@fluendo.com>");
/* VideoMixer signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
#define DEFAULT_BACKGROUND VIDEO_MIXER_BACKGROUND_CHECKER
enum
{
ARG_0,
ARG_BACKGROUND
};
#define GST_TYPE_VIDEO_MIXER_BACKGROUND (gst_video_mixer_background_get_type())
static GType
gst_video_mixer_background_get_type (void)
{
static GType video_mixer_background_type = 0;
static const GEnumValue video_mixer_background[] = {
{VIDEO_MIXER_BACKGROUND_CHECKER, "Checker pattern", "checker"},
{VIDEO_MIXER_BACKGROUND_BLACK, "Black", "black"},
{VIDEO_MIXER_BACKGROUND_WHITE, "White", "white"},
{0, NULL, NULL},
};
if (!video_mixer_background_type) {
video_mixer_background_type =
g_enum_register_static ("GstVideoMixerBackground",
video_mixer_background);
}
return video_mixer_background_type;
}
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw-yuv,"
"format = (fourcc) AYUV,"
"width = (int) [ 1, max ],"
"height = (int) [ 1, max ]," "framerate = (fraction) [ 0/1, MAX ]")
);
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink_%d",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS ("video/x-raw-yuv,"
"format = (fourcc) AYUV,"
"width = (int) [ 1, max ],"
"height = (int) [ 1, max ]," "framerate = (fraction) [ 0/1, MAX ]")
);
static void gst_videomixer_finalize (GObject * object);
static GstCaps *gst_videomixer_getcaps (GstPad * pad);
static gboolean gst_videomixer_query (GstPad * pad, GstQuery * query);
static GstFlowReturn gst_videomixer_collected (GstCollectPads * pads,
GstVideoMixer * mix);
static GstPad *gst_videomixer_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * name);
static void gst_videomixer_release_pad (GstElement * element, GstPad * pad);
static void gst_videomixer_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_videomixer_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstStateChangeReturn gst_videomixer_change_state (GstElement * element,
GstStateChange transition);
/*static guint gst_videomixer_signals[LAST_SIGNAL] = { 0 }; */
static void gst_videomixer_child_proxy_init (gpointer g_iface,
gpointer iface_data);
static void _do_init (GType object_type);
GST_BOILERPLATE_FULL (GstVideoMixer, gst_videomixer, GstElement,
GST_TYPE_ELEMENT, _do_init);
static void
_do_init (GType object_type)
{
const GInterfaceInfo child_proxy_info = {
(GInterfaceInitFunc) gst_videomixer_child_proxy_init,
NULL,
NULL
};
g_type_add_interface_static (object_type, GST_TYPE_CHILD_PROXY,
&child_proxy_info);
GST_INFO ("GstChildProxy interface registered");
}
static GstObject *
gst_videomixer_child_proxy_get_child_by_index (GstChildProxy * child_proxy,
guint index)
{
GstVideoMixer *mix = GST_VIDEO_MIXER (child_proxy);
GstObject *obj;
GST_VIDEO_MIXER_STATE_LOCK (mix);
if ((obj = g_slist_nth_data (mix->sinkpads, index)))
gst_object_ref (obj);
GST_VIDEO_MIXER_STATE_UNLOCK (mix);
return obj;
}
static guint
gst_videomixer_child_proxy_get_children_count (GstChildProxy * child_proxy)
{
guint count = 0;
GstVideoMixer *mix = GST_VIDEO_MIXER (child_proxy);
GST_VIDEO_MIXER_STATE_LOCK (mix);
count = mix->numpads;
GST_VIDEO_MIXER_STATE_UNLOCK (mix);
GST_INFO ("Children Count: %d", count);
return count;
}
static void
gst_videomixer_child_proxy_init (gpointer g_iface, gpointer iface_data)
{
GstChildProxyInterface *iface = g_iface;
GST_INFO ("intializing child proxy interface");
iface->get_child_by_index = gst_videomixer_child_proxy_get_child_by_index;
iface->get_children_count = gst_videomixer_child_proxy_get_children_count;
}
static void
gst_videomixer_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_factory));
gst_element_class_set_details (element_class, &gst_videomixer_details);
}
static void
gst_videomixer_class_init (GstVideoMixerClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_videomixer_finalize);
gobject_class->get_property = gst_videomixer_get_property;
gobject_class->set_property = gst_videomixer_set_property;
g_object_class_install_property (gobject_class, ARG_BACKGROUND,
g_param_spec_enum ("background", "Background", "Background type",
GST_TYPE_VIDEO_MIXER_BACKGROUND,
DEFAULT_BACKGROUND, G_PARAM_READWRITE));
gstelement_class->request_new_pad =
GST_DEBUG_FUNCPTR (gst_videomixer_request_new_pad);
gstelement_class->release_pad =
GST_DEBUG_FUNCPTR (gst_videomixer_release_pad);
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_videomixer_change_state);
/* Register the pad class */
(void) (GST_TYPE_VIDEO_MIXER_PAD);
}
static void
gst_videomixer_collect_free (GstVideoMixerCollect * mixcol)
{
if (mixcol->buffer) {
gst_buffer_unref (mixcol->buffer);
mixcol->buffer = NULL;
}
}
static void
gst_videomixer_reset (GstVideoMixer * mix)
{
GSList *walk;
mix->in_width = 0;
mix->in_height = 0;
mix->out_width = 0;
mix->out_height = 0;
mix->fps_n = mix->fps_d = 0;
mix->setcaps = FALSE;
mix->sendseg = FALSE;
mix->segment_position = 0;
mix->segment_rate = 1.0;
mix->last_ts = 0;
/* clean up collect data */
walk = mix->collect->data;
while (walk) {
GstVideoMixerCollect *data = (GstVideoMixerCollect *) walk->data;
gst_videomixer_collect_free (data);
walk = g_slist_next (walk);
}
mix->next_sinkpad = 0;
}
static void
gst_videomixer_init (GstVideoMixer * mix, GstVideoMixerClass * g_class)
{
GstElementClass *klass = GST_ELEMENT_GET_CLASS (mix);
mix->srcpad =
gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
"src"), "src");
gst_pad_set_getcaps_function (GST_PAD (mix->srcpad),
GST_DEBUG_FUNCPTR (gst_videomixer_getcaps));
gst_pad_set_query_function (GST_PAD (mix->srcpad),
GST_DEBUG_FUNCPTR (gst_videomixer_query));
gst_pad_set_event_function (GST_PAD (mix->srcpad),
GST_DEBUG_FUNCPTR (gst_videomixer_src_event));
gst_element_add_pad (GST_ELEMENT (mix), mix->srcpad);
mix->collect = gst_collect_pads_new ();
mix->background = DEFAULT_BACKGROUND;
gst_collect_pads_set_function (mix->collect,
(GstCollectPadsFunction) GST_DEBUG_FUNCPTR (gst_videomixer_collected),
mix);
mix->state_lock = g_mutex_new ();
/* initialize variables */
gst_videomixer_reset (mix);
}
static void
gst_videomixer_finalize (GObject * object)
{
GstVideoMixer *mix = GST_VIDEO_MIXER (object);
gst_object_unref (mix->collect);
g_mutex_free (mix->state_lock);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_videomixer_query_duration (GstVideoMixer * mix, GstQuery * query)
{
gint64 max;
gboolean res;
GstFormat format;
GstIterator *it;
gboolean done;
/* parse format */
gst_query_parse_duration (query, &format, NULL);
max = -1;
res = TRUE;
done = FALSE;
/* Take maximum of all durations */
it = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (mix));
while (!done) {
GstIteratorResult ires;
gpointer item;
ires = gst_iterator_next (it, &item);
switch (ires) {
case GST_ITERATOR_DONE:
done = TRUE;
break;
case GST_ITERATOR_OK:
{
GstPad *pad = GST_PAD_CAST (item);
gint64 duration;
/* ask sink peer for duration */
res &= gst_pad_query_peer_duration (pad, &format, &duration);
/* take max from all valid return values */
if (res) {
/* valid unknown length, stop searching */
if (duration == -1) {
max = duration;
done = TRUE;
}
/* else see if bigger than current max */
else if (duration > max)
max = duration;
}
break;
}
case GST_ITERATOR_RESYNC:
max = -1;
res = TRUE;
gst_iterator_resync (it);
break;
default:
res = FALSE;
done = TRUE;
break;
}
}
gst_iterator_free (it);
if (res) {
/* and store the max */
GST_DEBUG_OBJECT (mix, "Total duration in format %s: %"
GST_TIME_FORMAT, gst_format_get_name (format), GST_TIME_ARGS (max));
gst_query_set_duration (query, format, max);
}
return res;
}
static gboolean
gst_videomixer_query_latency (GstVideoMixer * mix, GstQuery * query)
{
GstClockTime min, max;
gboolean live;
gboolean res;
GstIterator *it;
gboolean done;
res = TRUE;
done = FALSE;
live = FALSE;
min = 0;
max = GST_CLOCK_TIME_NONE;
/* Take maximum of all latency values */
it = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (mix));
while (!done) {
GstIteratorResult ires;
gpointer item;
ires = gst_iterator_next (it, &item);
switch (ires) {
case GST_ITERATOR_DONE:
done = TRUE;
break;
case GST_ITERATOR_OK:
{
GstPad *pad = GST_PAD_CAST (item);
GstQuery *peerquery;
GstClockTime min_cur, max_cur;
gboolean live_cur;
peerquery = gst_query_new_latency ();
/* Ask peer for latency */
res &= gst_pad_peer_query (pad, peerquery);
/* take max from all valid return values */
if (res) {
gst_query_parse_latency (peerquery, &live_cur, &min_cur, &max_cur);
if (min_cur > min)
min = min_cur;
if (max_cur != GST_CLOCK_TIME_NONE &&
((max != GST_CLOCK_TIME_NONE && max_cur > max) ||
(max == GST_CLOCK_TIME_NONE)))
max = max_cur;
live = live || live_cur;
}
gst_query_unref (peerquery);
break;
}
case GST_ITERATOR_RESYNC:
live = FALSE;
min = 0;
max = GST_CLOCK_TIME_NONE;
res = TRUE;
gst_iterator_resync (it);
break;
default:
res = FALSE;
done = TRUE;
break;
}
}
gst_iterator_free (it);
if (res) {
/* store the results */
GST_DEBUG_OBJECT (mix, "Calculated total latency: live %s, min %"
GST_TIME_FORMAT ", max %" GST_TIME_FORMAT,
(live ? "yes" : "no"), GST_TIME_ARGS (min), GST_TIME_ARGS (max));
gst_query_set_latency (query, live, min, max);
}
return res;
}
static gboolean
gst_videomixer_query (GstPad * pad, GstQuery * query)
{
GstVideoMixer *mix = GST_VIDEO_MIXER (gst_pad_get_parent (pad));
gboolean res = FALSE;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_POSITION:
{
GstFormat format;
gst_query_parse_position (query, &format, NULL);
switch (format) {
case GST_FORMAT_TIME:
/* FIXME, bring to stream time, might be tricky */
gst_query_set_position (query, format, mix->last_ts);
res = TRUE;
break;
default:
break;
}
break;
}
case GST_QUERY_DURATION:
res = gst_videomixer_query_duration (mix, query);
break;
case GST_QUERY_LATENCY:
res = gst_videomixer_query_latency (mix, query);
break;
default:
/* FIXME, needs a custom query handler because we have multiple
* sinkpads */
res = gst_pad_query_default (pad, query);
break;
}
gst_object_unref (mix);
return res;
}
static GstCaps *
gst_videomixer_getcaps (GstPad * pad)
{
GstVideoMixer *mix;
GstCaps *caps;
GstStructure *structure;
mix = GST_VIDEO_MIXER (gst_pad_get_parent (pad));
caps = gst_caps_copy (gst_pad_get_pad_template_caps (mix->srcpad));
structure = gst_caps_get_structure (caps, 0);
if (mix->out_width != 0) {
gst_structure_set (structure, "width", G_TYPE_INT, mix->out_width, NULL);
}
if (mix->out_height != 0) {
gst_structure_set (structure, "height", G_TYPE_INT, mix->out_height, NULL);
}
if (mix->fps_d != 0) {
gst_structure_set (structure,
"framerate", GST_TYPE_FRACTION, mix->fps_n, mix->fps_d, NULL);
}
gst_object_unref (mix);
return caps;
}
static GstPad *
gst_videomixer_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * req_name)
{
GstVideoMixer *mix = NULL;
GstVideoMixerPad *mixpad = NULL;
GstElementClass *klass = GST_ELEMENT_GET_CLASS (element);
g_return_val_if_fail (templ != NULL, NULL);
if (templ->direction != GST_PAD_SINK) {
g_warning ("videomixer: request pad that is not a SINK pad\n");
return NULL;
}
g_return_val_if_fail (GST_IS_VIDEO_MIXER (element), NULL);
mix = GST_VIDEO_MIXER (element);
if (templ == gst_element_class_get_pad_template (klass, "sink_%d")) {
gint serial = 0;
gchar *name = NULL;
GstVideoMixerCollect *mixcol = NULL;
if (req_name == NULL || strlen (req_name) < 6) {
/* no name given when requesting the pad, use next available int */
serial = mix->next_sinkpad++;
} else {
/* parse serial number from requested padname */
serial = atoi (&req_name[5]);
if (serial >= mix->next_sinkpad)
mix->next_sinkpad = serial + 1;
}
/* create new pad with the name */
name = g_strdup_printf ("sink_%d", serial);
mixpad = g_object_new (GST_TYPE_VIDEO_MIXER_PAD, "name", name, "direction",
templ->direction, "template", templ, NULL);
g_free (name);
GST_VIDEO_MIXER_STATE_LOCK (mix);
mixpad->zorder = mix->numpads;
mixpad->xpos = DEFAULT_PAD_XPOS;
mixpad->ypos = DEFAULT_PAD_YPOS;
mixpad->alpha = DEFAULT_PAD_ALPHA;
mixcol = (GstVideoMixerCollect *)
gst_collect_pads_add_pad (mix->collect, GST_PAD (mixpad),
sizeof (GstVideoMixerCollect));
/* FIXME: hacked way to override/extend the event function of
* GstCollectPads; because it sets its own event function giving the
* element no access to events */
mix->collect_event =
(GstPadEventFunction) GST_PAD_EVENTFUNC (GST_PAD (mixpad));
gst_pad_set_event_function (GST_PAD (mixpad),
GST_DEBUG_FUNCPTR (gst_videomixer_sink_event));
/* Keep track of each other */
mixcol->mixpad = mixpad;
mixpad->mixcol = mixcol;
/* Keep an internal list of mixpads for zordering */
mix->sinkpads = g_slist_append (mix->sinkpads, mixpad);
mix->numpads++;
GST_VIDEO_MIXER_STATE_UNLOCK (mix);
} else {
g_warning ("videomixer: this is not our template!\n");
return NULL;
}
/* add the pad to the element */
gst_element_add_pad (element, GST_PAD (mixpad));
gst_child_proxy_child_added (GST_OBJECT (mix), GST_OBJECT (mixpad));
return GST_PAD (mixpad);
}
static void
gst_videomixer_release_pad (GstElement * element, GstPad * pad)
{
GstVideoMixer *mix = NULL;
GstVideoMixerPad *mixpad;
mix = GST_VIDEO_MIXER (element);
GST_VIDEO_MIXER_STATE_LOCK (mix);
if (G_UNLIKELY (g_slist_find (mix->sinkpads, pad) == NULL)) {
g_warning ("Unknown pad %s", GST_PAD_NAME (pad));
goto error;
}
mixpad = GST_VIDEO_MIXER_PAD (pad);
mix->sinkpads = g_slist_remove (mix->sinkpads, pad);
gst_videomixer_collect_free (mixpad->mixcol);
gst_collect_pads_remove_pad (mix->collect, pad);
gst_child_proxy_child_removed (GST_OBJECT (mix), GST_OBJECT (mixpad));
/* determine possibly new geometry and master */
gst_videomixer_set_master_geometry (mix);
mix->numpads--;
GST_VIDEO_MIXER_STATE_UNLOCK (mix);
gst_element_remove_pad (element, pad);
return;
error:
GST_VIDEO_MIXER_STATE_UNLOCK (mix);
}
#define BLEND_NORMAL(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = ((Y1*(255-alpha))+(Y2*alpha))>>8; \
U = ((U1*(255-alpha))+(U2*alpha))>>8; \
V = ((V1*(255-alpha))+(V2*alpha))>>8;
#define BLEND_ADD(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = Y1+((Y2*alpha)>>8); \
U = U1+(((127*(255-alpha)+(U2*alpha)))>>8)-127; \
V = V1+(((127*(255-alpha)+(V2*alpha)))>>8)-127; \
if (Y>255) { \
gint mult = MAX (0, 288-Y); \
U = ((U*mult) + (127*(32-mult)))>>5; \
V = ((V*mult) + (127*(32-mult)))>>5; \
Y = 255; \
} \
U = MIN (U,255); \
V = MIN (V,255);
#define BLEND_SUBTRACT(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = Y1-((Y2*alpha)>>8); \
U = U1+(((127*(255-alpha)+(U2*alpha)))>>8)-127; \
V = V1+(((127*(255-alpha)+(V2*alpha)))>>8)-127; \
if (Y<0) { \
gint mult = MIN (32, -Y); \
U = ((U*(32-mult)) + (127*mult))>>5; \
V = ((V*(32-mult)) + (127*mult))>>5; \
Y = 0; \
}
#define BLEND_DARKEN(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
if (Y1 < Y2) { \
Y = Y1; U = U1; V = V1; \
} \
else { \
Y = ((Y1*(255-alpha))+(Y2*alpha))>>8; \
U = ((U1*(255-alpha))+(U2*alpha))>>8; \
V = ((V1*(255-alpha))+(V2*alpha))>>8; \
}
#define BLEND_LIGHTEN(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
if (Y1 > Y2) { \
Y = Y1; U = U1; V = V1; \
} \
else { \
Y = ((Y1*(255-alpha))+(Y2*alpha))>>8; \
U = ((U1*(255-alpha))+(U2*alpha))>>8; \
V = ((V1*(255-alpha))+(V2*alpha))>>8; \
}
#define BLEND_MULTIPLY(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = (Y1*(256*(255-alpha) +(Y2*alpha)))>>16; \
U = ((U1*(255-alpha)*256)+(alpha*(U1*Y2+128*(256-Y2))))>>16; \
V = ((V1*(255-alpha)*256)+(alpha*(V1*Y2+128*(256-Y2))))>>16;
#define BLEND_DIFFERENCE(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = ABS((gint)Y1-(gint)Y2)+127; \
U = ABS((gint)U1-(gint)U2)+127; \
V = ABS((gint)V1-(gint)V2)+127; \
Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \
U = ((U*alpha)+(U1*(255-alpha)))>>8; \
V = ((V*alpha)+(V1*(255-alpha)))>>8; \
if (Y>255) { \
gint mult = MAX (0, 288-Y); \
U = ((U*mult) + (127*(32-mult)))>>5; \
V = ((V*mult) + (127*(32-mult)))>>5; \
Y = 255; \
} else if (Y<0) { \
gint mult = MIN (32, -Y); \
U = ((U*(32-mult)) + (127*mult))>>5; \
V = ((V*(32-mult)) + (127*mult))>>5; \
Y = 0; \
} \
U = CLAMP(U, 0, 255); \
V = CLAMP(V, 0, 255);
#define BLEND_EXCLUSION(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = ((gint)(Y1^0xff)*Y2+(gint)(Y2^0xff)*Y1)>>8; \
U = ((gint)(U1^0xff)*Y2+(gint)(Y2^0xff)*U1)>>8; \
V = ((gint)(V1^0xff)*Y2+(gint)(Y2^0xff)*V1)>>8; \
Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \
U = ((U*alpha)+(U1*(255-alpha)))>>8; \
V = ((V*alpha)+(V1*(255-alpha)))>>8; \
if (Y>255) { \
gint mult = MAX (0, 288-Y); \
U = ((U*mult) + (127*(32-mult)))>>5; \
V = ((V*mult) + (127*(32-mult)))>>5; \
Y = 255; \
} else if (Y<0) { \
gint mult = MIN (32, -Y); \
U = ((U*(32-mult)) + (127*mult))>>5; \
V = ((V*(32-mult)) + (127*mult))>>5; \
Y = 0; \
} \
U = CLAMP(U, 0, 255); \
V = CLAMP(V, 0, 255);
#define BLEND_SOFTLIGHT(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = (gint)Y1+(gint)Y2 - 127; \
U = (gint)U1+(gint)U2 - 127; \
V = (gint)V1+(gint)V2 - 127; \
Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \
U = ((U*alpha)+(U1*(255-alpha)))>>8; \
V = ((V*alpha)+(V1*(255-alpha)))>>8; \
if (Y>255) { \
gint mult = MAX (0, 288-Y); \
U = ((U*mult) + (127*(32-mult)))>>5; \
V = ((V*mult) + (127*(32-mult)))>>5; \
Y = 255; \
} else if (Y<0) { \
gint mult = MIN (32, -Y); \
U = ((U*(32-mult)) + (127*mult))>>5; \
V = ((V*(32-mult)) + (127*mult))>>5; \
Y = 0; \
} \
#define BLEND_HARDLIGHT(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = (gint)Y1+(gint)Y2*2 - 255; \
U = (gint)U1+(gint)U2 - 127; \
V = (gint)V1+(gint)V2 - 127; \
Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \
U = ((U*alpha)+(U1*(255-alpha)))>>8; \
V = ((V*alpha)+(V1*(255-alpha)))>>8; \
if (Y>255) { \
gint mult = MAX (0, 288-Y); \
U = ((U*mult) + (127*(32-mult)))>>5; \
V = ((V*mult) + (127*(32-mult)))>>5; \
Y = 255; \
} else if (Y<0) { \
gint mult = MIN (32, -Y); \
U = ((U*(32-mult)) + (127*mult))>>5; \
V = ((V*(32-mult)) + (127*mult))>>5; \
Y = 0; \
} \
#define BLEND_MODE BLEND_NORMAL
#if 0
#define BLEND_MODE BLEND_NORMAL
#define BLEND_MODE BLEND_ADD
#define BLEND_MODE BLEND_SUBTRACT
#define BLEND_MODE BLEND_LIGHTEN
#define BLEND_MODE BLEND_DARKEN
#define BLEND_MODE BLEND_MULTIPLY
#define BLEND_MODE BLEND_DIFFERENCE
#define BLEND_MODE BLEND_EXCLUSION
#define BLEND_MODE BLEND_SOFTLIGHT
#define BLEND_MODE BLEND_HARDLIGHT
#endif
/* note that this function does packing conversion and blending at the
* same time */
static void
gst_videomixer_blend_ayuv_ayuv (guint8 * src, gint xpos, gint ypos,
gint src_width, gint src_height, gdouble src_alpha,
guint8 * dest, gint dest_width, gint dest_height)
{
gint alpha, b_alpha;
gint i, j;
gint src_stride, dest_stride;
gint src_add, dest_add;
gint Y, U, V;
src_stride = src_width * 4;
dest_stride = dest_width * 4;
b_alpha = (gint) (src_alpha * 255);
/* adjust src pointers for negative sizes */
if (xpos < 0) {
src += -xpos * 4;
src_width -= -xpos;
xpos = 0;
}
if (ypos < 0) {
src += -ypos * src_stride;
src_height -= -ypos;
ypos = 0;
}
/* adjust width/height if the src is bigger than dest */
if (xpos + src_width > dest_width) {
src_width = dest_width - xpos;
}
if (ypos + src_height > dest_height) {
src_height = dest_height - ypos;
}
src_add = src_stride - (4 * src_width);
dest_add = dest_stride - (4 * src_width);
dest = dest + 4 * xpos + (ypos * dest_stride);
/* we convert a square of 2x2 samples to generate 4 Luma and 2 chroma samples */
for (i = 0; i < src_height; i++) {
for (j = 0; j < src_width; j++) {
alpha = (src[0] * b_alpha) >> 8;
BLEND_MODE (dest[1], dest[2], dest[3], src[1], src[2], src[3],
alpha, Y, U, V);
dest[0] = 0xff;
dest[1] = Y;
dest[2] = U;
dest[3] = V;
src += 4;
dest += 4;
}
src += src_add;
dest += dest_add;
}
}
#undef BLEND_MODE
static int
pad_zorder_compare (const GstVideoMixerPad * pad1,
const GstVideoMixerPad * pad2)
{
return pad1->zorder - pad2->zorder;
}
static void
gst_videomixer_sort_pads (GstVideoMixer * mix)
{
mix->sinkpads = g_slist_sort (mix->sinkpads,
(GCompareFunc) pad_zorder_compare);
}
/* fill a buffer with a checkerboard pattern */
static void
gst_videomixer_fill_checker (guint8 * dest, gint width, gint height)
{
gint i, j;
static int tab[] = { 80, 160, 80, 160 };
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
*dest++ = 0xff;
*dest++ = tab[((i & 0x8) >> 3) + ((j & 0x8) >> 3)];
*dest++ = 128;
*dest++ = 128;
}
}
}
static void
gst_videomixer_fill_color (guint8 * dest, gint width, gint height,
gint colY, gint colU, gint colV)
{
gint i, j;
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
*dest++ = 0xff;
*dest++ = colY;
*dest++ = colU;
*dest++ = colV;
}
}
}
/* try to get a buffer on all pads. As long as the queued value is
* negative, we skip buffers */
static gboolean
gst_videomixer_fill_queues (GstVideoMixer * mix)
{
GSList *walk = NULL;
gboolean eos = TRUE;
g_return_val_if_fail (GST_IS_VIDEO_MIXER (mix), FALSE);
/* try to make sure we have a buffer from each usable pad first */
walk = mix->collect->data;
while (walk) {
GstCollectData *data = (GstCollectData *) walk->data;
GstVideoMixerCollect *mixcol = (GstVideoMixerCollect *) data;
GstVideoMixerPad *mixpad = mixcol->mixpad;
walk = g_slist_next (walk);
if (mixcol->buffer == NULL) {
GstBuffer *buf = NULL;
GST_LOG ("we need a new buffer");
buf = gst_collect_pads_pop (mix->collect, data);
if (buf) {
guint64 duration;
GST_LOG ("we have a buffer !");
mixcol->buffer = buf;
duration = GST_BUFFER_DURATION (mixcol->buffer);
/* no duration on the buffer, use the framerate */
if (!GST_CLOCK_TIME_IS_VALID (duration)) {
if (mixpad->fps_n == 0) {
duration = GST_CLOCK_TIME_NONE;
} else {
duration = GST_SECOND * mixpad->fps_d / mixpad->fps_n;
}
}
if (GST_CLOCK_TIME_IS_VALID (duration))
mixpad->queued += duration;
else if (!mixpad->queued)
mixpad->queued = GST_CLOCK_TIME_NONE;
} else {
GST_LOG ("pop returned a NULL buffer");
}
}
if (mix->sendseg && (mixpad == mix->master)) {
GstEvent *event;
GstSegment *segment = &data->segment;
/* FIXME, use rate/applied_rate as set on all sinkpads.
* - currently we just set rate as received from last seek-event
* We could potentially figure out the duration as well using
* the current segment positions and the stated stop positions.
* Also we just start from stream time 0 which is rather
* weird. For non-synchronized mixing, the time should be
* the min of the stream times of all received segments,
* rationale being that the duration is at least going to
* be as long as the earliest stream we start mixing. This
* would also be correct for synchronized mixing but then
* the later streams would be delayed until the stream times
* match.
*/
GST_INFO ("_sending play segment");
event = gst_event_new_new_segment (FALSE, segment->rate, segment->format,
segment->start, segment->stop, mix->segment_position);
gst_pad_push_event (mix->srcpad, event);
mix->sendseg = FALSE;
}
if (mixcol->buffer != NULL && GST_CLOCK_TIME_IS_VALID (mixpad->queued)) {
/* got a buffer somewhere so we're not eos */
eos = FALSE;
}
}
return eos;
}
/* blend all buffers present on the pads */
static void
gst_videomixer_blend_buffers (GstVideoMixer * mix, GstBuffer * outbuf)
{
GSList *walk;
walk = mix->sinkpads;
while (walk) { /* We walk with this list because it's ordered */
GstVideoMixerPad *pad = GST_VIDEO_MIXER_PAD (walk->data);
GstVideoMixerCollect *mixcol = pad->mixcol;
walk = g_slist_next (walk);
if (mixcol->buffer != NULL) {
if (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_TIMESTAMP (mixcol->buffer)))
gst_object_sync_values (G_OBJECT (pad),
GST_BUFFER_TIMESTAMP (mixcol->buffer));
gst_videomixer_blend_ayuv_ayuv (GST_BUFFER_DATA (mixcol->buffer),
pad->xpos, pad->ypos, pad->in_width, pad->in_height, pad->alpha,
GST_BUFFER_DATA (outbuf), mix->out_width, mix->out_height);
if (pad == mix->master) {
GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (mixcol->buffer);
GST_BUFFER_DURATION (outbuf) = GST_BUFFER_DURATION (mixcol->buffer);
mix->last_ts = GST_BUFFER_TIMESTAMP (outbuf);
if (GST_BUFFER_DURATION_IS_VALID (outbuf))
mix->last_ts += GST_BUFFER_DURATION (outbuf);
}
}
}
}
/* remove buffers from the queue that were expired in the
* interval of the master, we also prepare the queued value
* in the pad so that we can skip and fill buffers later on */
static void
gst_videomixer_update_queues (GstVideoMixer * mix)
{
GSList *walk;
guint64 interval;
interval = mix->master->queued;
if (interval <= 0) {
if (mix->fps_n == 0) {
interval = G_MAXINT64;
} else {
interval = GST_SECOND * mix->fps_d / mix->fps_n;
}
}
walk = mix->sinkpads;
while (walk) {
GstVideoMixerPad *pad = GST_VIDEO_MIXER_PAD (walk->data);
GstVideoMixerCollect *mixcol = pad->mixcol;
walk = g_slist_next (walk);
if (mixcol->buffer != NULL && GST_CLOCK_TIME_IS_VALID (pad->queued)) {
pad->queued -= interval;
GST_DEBUG_OBJECT (pad, "queued now %lld", pad->queued);
if (pad->queued <= 0) {
GST_DEBUG ("unreffing buffer");
gst_buffer_unref (mixcol->buffer);
mixcol->buffer = NULL;
}
}
}
}
static GstFlowReturn
gst_videomixer_collected (GstCollectPads * pads, GstVideoMixer * mix)
{
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *outbuf = NULL;
size_t outsize = 0;
gboolean eos = FALSE;
g_return_val_if_fail (GST_IS_VIDEO_MIXER (mix), GST_FLOW_ERROR);
GST_LOG ("all pads are collected");
GST_VIDEO_MIXER_STATE_LOCK (mix);
eos = gst_videomixer_fill_queues (mix);
if (eos) {
/* Push EOS downstream */
GST_LOG ("all our sinkpads are EOS, pushing downstream");
gst_pad_push_event (mix->srcpad, gst_event_new_eos ());
ret = GST_FLOW_WRONG_STATE;
goto error;
}
/* Calculating out buffer size from input size */
outsize = 4 * mix->in_width * GST_ROUND_UP_2 (mix->in_height);
/* If geometry has changed we need to set new caps on the buffer */
if (mix->in_width != mix->out_width || mix->in_height != mix->out_height
|| mix->setcaps) {
GstCaps *newcaps = NULL;
newcaps = gst_caps_make_writable
(gst_pad_get_negotiated_caps (GST_PAD (mix->master)));
gst_caps_set_simple (newcaps,
"format", GST_TYPE_FOURCC, GST_STR_FOURCC ("AYUV"),
"width", G_TYPE_INT, mix->in_width,
"height", G_TYPE_INT, mix->in_height, NULL);
mix->out_width = mix->in_width;
mix->out_height = mix->in_height;
mix->setcaps = FALSE;
ret =
gst_pad_alloc_buffer_and_set_caps (mix->srcpad, GST_BUFFER_OFFSET_NONE,
outsize, newcaps, &outbuf);
gst_caps_unref (newcaps);
} else { /* Otherwise we just allocate a buffer from current caps */
ret =
gst_pad_alloc_buffer_and_set_caps (mix->srcpad, GST_BUFFER_OFFSET_NONE,
outsize, GST_PAD_CAPS (mix->srcpad), &outbuf);
}
if (ret != GST_FLOW_OK) {
goto error;
}
switch (mix->background) {
case VIDEO_MIXER_BACKGROUND_CHECKER:
gst_videomixer_fill_checker (GST_BUFFER_DATA (outbuf),
mix->out_width, mix->out_height);
break;
case VIDEO_MIXER_BACKGROUND_BLACK:
gst_videomixer_fill_color (GST_BUFFER_DATA (outbuf),
mix->out_width, mix->out_height, 16, 128, 128);
break;
case VIDEO_MIXER_BACKGROUND_WHITE:
gst_videomixer_fill_color (GST_BUFFER_DATA (outbuf),
mix->out_width, mix->out_height, 240, 128, 128);
break;
}
gst_videomixer_blend_buffers (mix, outbuf);
gst_videomixer_update_queues (mix);
GST_VIDEO_MIXER_STATE_UNLOCK (mix);
ret = gst_pad_push (mix->srcpad, outbuf);
beach:
return ret;
/* ERRORS */
error:
{
GST_VIDEO_MIXER_STATE_UNLOCK (mix);
goto beach;
}
}
static gboolean
forward_event_func (GstPad * pad, GValue * ret, GstEvent * event)
{
gst_event_ref (event);
GST_LOG_OBJECT (pad, "About to send event %s", GST_EVENT_TYPE_NAME (event));
if (!gst_pad_push_event (pad, event)) {
g_value_set_boolean (ret, FALSE);
GST_WARNING_OBJECT (pad, "Sending event %p (%s) failed.",
event, GST_EVENT_TYPE_NAME (event));
} else {
GST_LOG_OBJECT (pad, "Sent event %p (%s).",
event, GST_EVENT_TYPE_NAME (event));
}
gst_object_unref (pad);
return TRUE;
}
/* forwards the event to all sinkpads, takes ownership of the
* event
*
* Returns: TRUE if the event could be forwarded on all
* sinkpads.
*/
static gboolean
forward_event (GstVideoMixer * mix, GstEvent * event)
{
gboolean ret;
GstIterator *it;
GValue vret = { 0 };
GST_LOG_OBJECT (mix, "Forwarding event %p (%s)", event,
GST_EVENT_TYPE_NAME (event));
ret = TRUE;
g_value_init (&vret, G_TYPE_BOOLEAN);
g_value_set_boolean (&vret, TRUE);
it = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (mix));
gst_iterator_fold (it, (GstIteratorFoldFunction) forward_event_func, &vret,
event);
gst_iterator_free (it);
gst_event_unref (event);
ret = g_value_get_boolean (&vret);
return ret;
}
static gboolean
gst_videomixer_src_event (GstPad * pad, GstEvent * event)
{
GstVideoMixer *mix;
gboolean result;
mix = GST_VIDEO_MIXER (gst_pad_get_parent (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_QOS:
/* QoS might be tricky */
result = FALSE;
break;
case GST_EVENT_SEEK:
{
GstSeekFlags flags;
GstSeekType curtype;
gint64 cur;
/* parse the seek parameters */
gst_event_parse_seek (event, NULL, NULL, &flags, &curtype,
&cur, NULL, NULL);
/* check if we are flushing */
if (flags & GST_SEEK_FLAG_FLUSH) {
/* make sure we accept nothing anymore and return WRONG_STATE */
gst_collect_pads_set_flushing (mix->collect, TRUE);
/* flushing seek, start flush downstream, the flush will be done
* when all pads received a FLUSH_STOP. */
gst_pad_push_event (mix->srcpad, gst_event_new_flush_start ());
}
/* now wait for the collected to be finished and mark a new
* segment */
GST_OBJECT_LOCK (mix->collect);
if (curtype == GST_SEEK_TYPE_SET)
mix->segment_position = cur;
else
mix->segment_position = 0;
mix->sendseg = TRUE;
GST_OBJECT_UNLOCK (mix->collect);
result = forward_event (mix, event);
break;
}
case GST_EVENT_NAVIGATION:
/* navigation is rather pointless. */
result = FALSE;
break;
default:
/* just forward the rest for now */
result = forward_event (mix, event);
break;
}
gst_object_unref (mix);
return result;
}
static gboolean
gst_videomixer_sink_event (GstPad * pad, GstEvent * event)
{
GstVideoMixer *videomixer;
gboolean ret;
videomixer = GST_VIDEO_MIXER (gst_pad_get_parent (pad));
GST_DEBUG ("Got %s event on pad %s:%s", GST_EVENT_TYPE_NAME (event),
GST_DEBUG_PAD_NAME (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
/* mark a pending new segment. This event is synchronized
* with the streaming thread so we can safely update the
* variable without races. It's somewhat weird because we
* assume the collectpads forwarded the FLUSH_STOP past us
* and downstream (using our source pad, the bastard!).
*/
videomixer->sendseg = TRUE;
break;
default:
break;
}
/* now GstCollectPads can take care of the rest, e.g. EOS */
ret = videomixer->collect_event (pad, event);
gst_object_unref (videomixer);
return ret;
}
static void
gst_videomixer_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstVideoMixer *mix = GST_VIDEO_MIXER (object);
switch (prop_id) {
case ARG_BACKGROUND:
g_value_set_enum (value, mix->background);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_videomixer_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstVideoMixer *mix = GST_VIDEO_MIXER (object);
switch (prop_id) {
case ARG_BACKGROUND:
mix->background = g_value_get_enum (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstStateChangeReturn
gst_videomixer_change_state (GstElement * element, GstStateChange transition)
{
GstVideoMixer *mix;
GstStateChangeReturn ret;
g_return_val_if_fail (GST_IS_VIDEO_MIXER (element), GST_STATE_CHANGE_FAILURE);
mix = GST_VIDEO_MIXER (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
GST_LOG ("starting collectpads");
gst_collect_pads_start (mix->collect);
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
GST_LOG ("stopping collectpads");
gst_collect_pads_stop (mix->collect);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_videomixer_reset (mix);
break;
default:
break;
}
return ret;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_videomixer_debug, "videomixer", 0,
"video mixer");
return gst_element_register (plugin, "videomixer", GST_RANK_PRIMARY,
GST_TYPE_VIDEO_MIXER);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"videomixer",
"Video mixer", plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME,
GST_PACKAGE_ORIGIN)
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