gstreamer/subprojects/gst-editing-services/ges/ges-smart-video-mixer.c
Thibault Saunier 18f313d317 ges: smart-mixer: Avoid video freeze on NLE stack changes
Since we support "nested compositors"[0] we were not finalizing the pads_infos
and thus not releasing the mixer pad on stack change, meaning that
the following stacks were never prerolling.

[0] https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2094

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3738>
2023-01-17 20:10:19 +00:00

507 lines
14 KiB
C

/* -*- Mode: C; indent-tabs-mode: nil; c-basic-offset: 4; tab-width: 4 -*- */
/*
* gst-editing-services
*
* Copyright (C) 2013 Mathieu Duponchelle <mduponchelle1@gmail.com>
* gst-editing-services 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 3 of the License, or
* (at your option) any later version.
*
* gst-editing-services 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 program. If not, see <http://www.gnu.org/licenses/>.";
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstframepositioner.h"
#include "ges-types.h"
#include "ges-internal.h"
#include "ges-smart-video-mixer.h"
#include <gst/base/base.h>
#define GES_TYPE_SMART_MIXER_PAD (ges_smart_mixer_pad_get_type ())
typedef struct _GESSmartMixerPad GESSmartMixerPad;
typedef struct _GESSmartMixerPadClass GESSmartMixerPadClass;
GES_DECLARE_TYPE (SmartMixerPad, smart_mixer_pad, SMART_MIXER_PAD);
struct _GESSmartMixerPad
{
GstGhostPad parent;
gdouble alpha;
GstSegment segment;
};
struct _GESSmartMixerPadClass
{
GstGhostPadClass parent_class;
};
enum
{
PROP_PAD_0,
PROP_PAD_ALPHA,
};
G_DEFINE_TYPE (GESSmartMixerPad, ges_smart_mixer_pad, GST_TYPE_GHOST_PAD);
static void
ges_smart_mixer_pad_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GESSmartMixerPad *pad = GES_SMART_MIXER_PAD (object);
switch (prop_id) {
case PROP_PAD_ALPHA:
g_value_set_double (value, pad->alpha);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
ges_smart_mixer_pad_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GESSmartMixerPad *pad = GES_SMART_MIXER_PAD (object);
switch (prop_id) {
case PROP_PAD_ALPHA:
pad->alpha = g_value_get_double (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
ges_smart_mixer_pad_init (GESSmartMixerPad * self)
{
gst_segment_init (&self->segment, GST_FORMAT_UNDEFINED);
}
static void
ges_smart_mixer_pad_class_init (GESSmartMixerPadClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
gobject_class->get_property = ges_smart_mixer_pad_get_property;
gobject_class->set_property = ges_smart_mixer_pad_set_property;
g_object_class_install_property (gobject_class, PROP_PAD_ALPHA,
g_param_spec_double ("alpha", "Alpha", "Alpha of the picture", 0.0, 1.0,
1.0,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
}
G_DEFINE_TYPE (GESSmartMixer, ges_smart_mixer, GST_TYPE_BIN);
#define GET_LOCK(obj) (&((GESSmartMixer*)(obj))->lock)
#define LOCK(obj) (g_mutex_lock (GET_LOCK(obj)))
#define UNLOCK(obj) (g_mutex_unlock (GET_LOCK(obj)))
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw")
);
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink_%u",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS ("video/x-raw")
);
typedef struct _PadInfos
{
gint refcount;
GESSmartMixer *self;
GstPad *mixer_pad;
GstPad *ghostpad;
GstPad *real_mixer_pad;
} PadInfos;
static void
pad_infos_unref (PadInfos * infos)
{
if (g_atomic_int_dec_and_test (&infos->refcount)) {
GST_DEBUG_OBJECT (infos->mixer_pad, "Releasing pad");
if (infos->mixer_pad) {
gst_element_release_request_pad (infos->self->mixer, infos->mixer_pad);
gst_object_unref (infos->mixer_pad);
}
gst_clear_object (&infos->real_mixer_pad);
g_free (infos);
}
}
static PadInfos *
pad_infos_new (void)
{
PadInfos *info = g_new0 (PadInfos, 1);
g_atomic_int_set (&info->refcount, 1);
return info;
}
static PadInfos *
pad_infos_ref (PadInfos * info)
{
g_atomic_int_inc (&info->refcount);
return info;
}
static gboolean
ges_smart_mixer_sinkpad_event_func (GstPad * pad, GstObject * parent,
GstEvent * event)
{
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEGMENT:
{
const GstSegment *seg;
gst_event_parse_segment (event, &seg);
GST_OBJECT_LOCK (pad);
((GESSmartMixerPad *) pad)->segment = *seg;
GST_OBJECT_UNLOCK (pad);
break;
}
default:
break;
}
return gst_pad_event_default (pad, parent, event);
}
GstPad *
ges_smart_mixer_get_mixer_pad (GESSmartMixer * self, GstPad ** mixerpad)
{
PadInfos *info;
GstPad *sinkpad;
sinkpad = gst_element_request_pad_simple (GST_ELEMENT (self), "sink_%u");
if (sinkpad == NULL)
return NULL;
info = g_hash_table_lookup (self->pads_infos, sinkpad);
*mixerpad = gst_object_ref (info->mixer_pad);
return sinkpad;
}
static void
set_pad_properties_from_positioner_meta (GstPad * mixer_pad, GstSample * sample,
GESSmartMixerPad * ghost)
{
GstFramePositionerMeta *meta;
GstBuffer *buf = gst_sample_get_buffer (sample);
GESSmartMixer *self = GES_SMART_MIXER (GST_OBJECT_PARENT (ghost));
meta =
(GstFramePositionerMeta *) gst_buffer_get_meta (buf,
gst_frame_positioner_meta_api_get_type ());
if (!meta) {
GST_WARNING ("The current source should use a framepositioner");
return;
}
if (!self->is_transition) {
g_object_set (mixer_pad, "alpha", meta->alpha,
"zorder", meta->zorder, NULL);
} else {
gint64 stream_time;
gdouble transalpha;
stream_time = gst_segment_to_stream_time (gst_sample_get_segment (sample),
GST_FORMAT_TIME, GST_BUFFER_PTS (buf));
/* When used in a transition we aggregate the alpha value value if the
* transition pad and the alpha value from upstream frame positioner */
if (GST_CLOCK_TIME_IS_VALID (stream_time))
gst_object_sync_values (GST_OBJECT (ghost), stream_time);
g_object_get (ghost, "alpha", &transalpha, NULL);
g_object_set (mixer_pad, "alpha", meta->alpha * transalpha, NULL);
}
g_object_set (mixer_pad, "xpos", meta->posx, "ypos",
meta->posy, "width", meta->width, "height", meta->height, NULL);
if (self->ABI.abi.has_operator)
g_object_set (mixer_pad, "operator", meta->operator, NULL);
}
/****************************************************
* GstElement vmetods *
****************************************************/
static GstPad *
_request_new_pad (GstElement * element, GstPadTemplate * templ,
const gchar * name, const GstCaps * caps)
{
PadInfos *infos = pad_infos_new ();
GESSmartMixer *self = GES_SMART_MIXER (element);
GstPad *ghost;
gchar *mixer_pad_name;
infos->mixer_pad = gst_element_request_pad (self->mixer,
gst_element_class_get_pad_template (GST_ELEMENT_GET_CLASS (self->mixer),
"sink_%u"), NULL, NULL);
if (infos->mixer_pad == NULL) {
GST_WARNING_OBJECT (element, "Could not get any pad from GstMixer");
pad_infos_unref (infos);
return NULL;
}
/* We can rely on this because the mixer bin uses the same name pad
as the internal mixer when creating the ghost pad. */
mixer_pad_name = gst_pad_get_name (infos->mixer_pad);
infos->real_mixer_pad = gst_element_get_static_pad (self->real_mixer,
mixer_pad_name);
g_free (mixer_pad_name);
if (infos->real_mixer_pad == NULL) {
GST_WARNING_OBJECT (element, "Could not get the real mixer pad");
pad_infos_unref (infos);
return NULL;
}
infos->self = self;
ghost = g_object_new (ges_smart_mixer_pad_get_type (), "name", name,
"direction", GST_PAD_DIRECTION (infos->mixer_pad), NULL);
infos->ghostpad = ghost;
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (ghost), infos->mixer_pad);
gst_pad_set_active (ghost, TRUE);
if (!gst_element_add_pad (GST_ELEMENT (self), ghost))
goto could_not_add;
gst_pad_set_event_function (GST_PAD (ghost),
ges_smart_mixer_sinkpad_event_func);
LOCK (self);
g_hash_table_insert (self->pads_infos, ghost, infos);
g_hash_table_insert (self->pads_infos, infos->mixer_pad,
pad_infos_ref (infos));
g_hash_table_insert (self->pads_infos, infos->real_mixer_pad,
pad_infos_ref (infos));
UNLOCK (self);
GST_DEBUG_OBJECT (self, "Returning new pad %" GST_PTR_FORMAT, ghost);
return ghost;
could_not_add:
{
GST_ERROR_OBJECT (self, "could not add pad");
pad_infos_unref (infos);
return NULL;
}
}
static PadInfos *
ges_smart_mixer_find_pad_info (GESSmartMixer * self, GstPad * pad)
{
PadInfos *info;
LOCK (self);
info = g_hash_table_lookup (self->pads_infos, pad);
UNLOCK (self);
if (info)
pad_infos_ref (info);
return info;
}
static void
_release_pad (GstElement * element, GstPad * pad)
{
GstPad *peer;
GESSmartMixer *self = GES_SMART_MIXER (element);
PadInfos *info = ges_smart_mixer_find_pad_info (self, pad);
GST_DEBUG_OBJECT (element, "Releasing pad %" GST_PTR_FORMAT, pad);
LOCK (element);
g_hash_table_remove (GES_SMART_MIXER (element)->pads_infos, pad);
g_hash_table_remove (GES_SMART_MIXER (element)->pads_infos, info->mixer_pad);
g_hash_table_remove (GES_SMART_MIXER (element)->pads_infos,
info->real_mixer_pad);
peer = gst_pad_get_peer (pad);
if (peer) {
gst_pad_unlink (peer, pad);
gst_object_unref (peer);
}
gst_pad_set_active (pad, FALSE);
gst_element_remove_pad (element, pad);
UNLOCK (element);
pad_infos_unref (info);
}
static gboolean
compositor_sync_properties_with_meta (GstElement * compositor,
GstPad * sinkpad, GESSmartMixer * self)
{
PadInfos *info = ges_smart_mixer_find_pad_info (self, sinkpad);
GstSample *sample;
if (!info) {
GST_WARNING_OBJECT (self, "Couldn't find pad info?!");
return TRUE;
}
sample = gst_aggregator_peek_next_sample (GST_AGGREGATOR (compositor),
GST_AGGREGATOR_PAD (sinkpad));
if (sample) {
set_pad_properties_from_positioner_meta (sinkpad,
sample, GES_SMART_MIXER_PAD (info->ghostpad));
gst_sample_unref (sample);
} else {
GST_INFO_OBJECT (sinkpad, "No sample set!");
}
pad_infos_unref (info);
return TRUE;
}
static void
ges_smart_mixer_samples_selected_cb (GstElement * compositor,
GstSegment * segment, GstClockTime pts, GstClockTime dts,
GstClockTime duration, GstStructure * info, GESSmartMixer * self)
{
gst_element_foreach_sink_pad (compositor,
(GstElementForeachPadFunc) compositor_sync_properties_with_meta, self);
}
/****************************************************
* GObject vmethods *
****************************************************/
static void
ges_smart_mixer_dispose (GObject * object)
{
GESSmartMixer *self = GES_SMART_MIXER (object);
if (self->pads_infos != NULL) {
g_hash_table_unref (self->pads_infos);
self->pads_infos = NULL;
}
gst_clear_object (&self->real_mixer);
G_OBJECT_CLASS (ges_smart_mixer_parent_class)->dispose (object);
}
static void
ges_smart_mixer_finalize (GObject * object)
{
GESSmartMixer *self = GES_SMART_MIXER (object);
g_mutex_clear (&self->lock);
G_OBJECT_CLASS (ges_smart_mixer_parent_class)->finalize (object);
}
static void
ges_smart_mixer_constructed (GObject * obj)
{
GstPad *pad;
GstElement *identity, *videoconvert;
GESSmartMixer *self = GES_SMART_MIXER (obj);
gchar *cname = g_strdup_printf ("%s-compositor", GST_OBJECT_NAME (self));
self->mixer =
gst_element_factory_create (ges_get_compositor_factory (), cname);
self->ABI.abi.has_operator =
gst_compositor_operator_get_type_and_default_value (NULL) != G_TYPE_NONE;
g_free (cname);
if (GST_IS_BIN (self->mixer)) {
g_object_get (self->mixer, "mixer", &self->real_mixer, NULL);
g_assert (self->real_mixer);
} else {
self->real_mixer = gst_object_ref (self->mixer);
}
g_object_set (self->real_mixer, "background", 1, "emit-signals", TRUE, NULL);
g_signal_connect (self->real_mixer, "samples-selected",
G_CALLBACK (ges_smart_mixer_samples_selected_cb), self);
/* See https://gitlab.freedesktop.org/gstreamer/gstreamer/issues/310 */
GST_FIXME ("Stop dropping allocation query when it is not required anymore.");
identity = gst_element_factory_make ("identity", NULL);
g_object_set (identity, "drop-allocation", TRUE, NULL);
g_assert (identity);
videoconvert = gst_element_factory_make ("videoconvert", NULL);
g_assert (videoconvert);
gst_bin_add_many (GST_BIN (self), self->mixer, identity, videoconvert, NULL);
gst_element_link_many (self->mixer, identity, videoconvert, NULL);
pad = gst_element_get_static_pad (videoconvert, "src");
self->srcpad = gst_ghost_pad_new ("src", pad);
gst_pad_set_active (self->srcpad, TRUE);
gst_object_unref (pad);
gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
}
static void
ges_smart_mixer_class_init (GESSmartMixerClass * klass)
{
/* GstBinClass *parent_class = GST_BIN_CLASS (klass);
*/
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
/* FIXME Make sure the MixerClass doesn get destroy before ourself */
gst_element_class_add_static_pad_template (element_class, &src_template);
gst_element_class_add_static_pad_template (element_class, &sink_template);
gst_element_class_set_static_metadata (element_class, "GES Smart mixer",
"Generic/Audio",
"Use mixer making use of GES information",
"Thibault Saunier <thibault.saunier@collabora.com>");
element_class->request_new_pad = GST_DEBUG_FUNCPTR (_request_new_pad);
element_class->release_pad = GST_DEBUG_FUNCPTR (_release_pad);
object_class->dispose = ges_smart_mixer_dispose;
object_class->finalize = ges_smart_mixer_finalize;
object_class->constructed = ges_smart_mixer_constructed;
}
static void
ges_smart_mixer_init (GESSmartMixer * self)
{
g_mutex_init (&self->lock);
self->pads_infos = g_hash_table_new_full (g_direct_hash, g_direct_equal,
NULL, (GDestroyNotify) pad_infos_unref);
}
GstElement *
ges_smart_mixer_new (GESTrack * track)
{
GESSmartMixer *self = g_object_new (GES_TYPE_SMART_MIXER, NULL);
/* FIXME Make mixer smart and let it properly negotiate caps! */
return GST_ELEMENT (self);
}