gstreamer/ext/gl/gstglbasemixer.c

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/* Generic video mixer plugin
*
* GStreamer
* Copyright (C) 2015 Matthew Waters <matthew@centricular.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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/video/video.h>
#include "gstglbasemixer.h"
#define GST_CAT_DEFAULT gst_gl_base_mixer_debug
GST_DEBUG_CATEGORY (gst_gl_base_mixer_debug);
static void gst_gl_base_mixer_pad_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_gl_base_mixer_pad_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_gl_base_mixer_set_context (GstElement * element,
GstContext * context);
static GstStateChangeReturn gst_gl_base_mixer_change_state (GstElement *
element, GstStateChange transition);
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static void gst_gl_base_mixer_gl_start (GstGLContext * context, gpointer data);
static void gst_gl_base_mixer_gl_stop (GstGLContext * context, gpointer data);
struct _GstGLBaseMixerPrivate
{
gboolean negotiated;
GstGLContext *other_context;
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gboolean gl_started;
gboolean gl_result;
GRecMutex context_lock;
};
#define gst_gl_base_mixer_parent_class parent_class
G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GstGLBaseMixer, gst_gl_base_mixer,
GST_TYPE_VIDEO_AGGREGATOR);
G_DEFINE_TYPE (GstGLBaseMixerPad, gst_gl_base_mixer_pad,
GST_TYPE_VIDEO_AGGREGATOR_PAD);
static void
gst_gl_base_mixer_pad_class_init (GstGLBaseMixerPadClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstVideoAggregatorPadClass *vaggpad_class =
(GstVideoAggregatorPadClass *) klass;
gobject_class->set_property = gst_gl_base_mixer_pad_set_property;
gobject_class->get_property = gst_gl_base_mixer_pad_get_property;
vaggpad_class->prepare_frame = NULL;
vaggpad_class->clean_frame = NULL;
}
static void
gst_gl_base_mixer_pad_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_gl_base_mixer_pad_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
_find_local_gl_context_unlocked (GstGLBaseMixer * mix)
{
GstGLContext *context, *prev_context;
gboolean ret;
if (mix->context && mix->context->display == mix->display)
return TRUE;
context = prev_context = mix->context;
g_rec_mutex_unlock (&mix->priv->context_lock);
/* we need to drop the lock to query as another element may also be
* performing a context query on us which would also attempt to take the
* context_lock. Our query could block on the same lock in the other element.
*/
ret =
gst_gl_query_local_gl_context (GST_ELEMENT (mix), GST_PAD_SRC, &context);
g_rec_mutex_lock (&mix->priv->context_lock);
if (ret) {
if (mix->context != prev_context) {
/* we need to recheck everything since we dropped the lock and the
* context has changed */
if (mix->context && mix->context->display == mix->display) {
if (context != mix->context)
gst_clear_object (&context);
return TRUE;
}
}
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if (context->display == mix->display) {
mix->context = context;
return TRUE;
}
if (context != mix->context)
gst_clear_object (&context);
}
context = prev_context = mix->context;
g_rec_mutex_unlock (&mix->priv->context_lock);
/* we need to drop the lock to query as another element may also be
* performing a context query on us which would also attempt to take the
* context_lock. Our query could block on the same lock in the other element.
*/
ret =
gst_gl_query_local_gl_context (GST_ELEMENT (mix), GST_PAD_SINK, &context);
g_rec_mutex_lock (&mix->priv->context_lock);
if (ret) {
if (mix->context != prev_context) {
/* we need to recheck everything now that we dropped the lock */
if (mix->context && mix->context->display == mix->display) {
if (context != mix->context)
gst_clear_object (&context);
return TRUE;
}
}
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if (context->display == mix->display) {
mix->context = context;
return TRUE;
}
if (context != mix->context)
gst_clear_object (&context);
}
return FALSE;
}
static gboolean
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_get_gl_context_unlocked (GstGLBaseMixer * mix)
{
GstGLBaseMixerClass *mix_class = GST_GL_BASE_MIXER_GET_CLASS (mix);
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gboolean new_context = FALSE;
GError *error = NULL;
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if (!mix->context)
new_context = TRUE;
if (!gst_gl_ensure_element_data (mix, &mix->display,
&mix->priv->other_context))
return FALSE;
gst_gl_display_filter_gl_api (mix->display, mix_class->supported_gl_api);
_find_local_gl_context_unlocked (mix);
GST_OBJECT_LOCK (mix->display);
if (!mix->context) {
do {
if (mix->context) {
gst_object_unref (mix->context);
mix->context = NULL;
}
/* just get a GL context. we don't care */
mix->context =
gst_gl_display_get_gl_context_for_thread (mix->display, NULL);
if (!mix->context) {
if (!gst_gl_display_create_context (mix->display,
mix->priv->other_context, &mix->context, &error)) {
GST_OBJECT_UNLOCK (mix->display);
goto context_error;
}
}
} while (!gst_gl_display_add_context (mix->display, mix->context));
}
GST_OBJECT_UNLOCK (mix->display);
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if (new_context || !mix->priv->gl_started) {
if (mix->priv->gl_started)
gst_gl_context_thread_add (mix->context, gst_gl_base_mixer_gl_stop, mix);
{
if ((gst_gl_context_get_gl_api (mix->
context) & mix_class->supported_gl_api) == 0)
goto unsupported_gl_api;
}
gst_gl_context_thread_add (mix->context, gst_gl_base_mixer_gl_start, mix);
if (!mix->priv->gl_started)
goto error;
}
return TRUE;
unsupported_gl_api:
{
GstGLAPI gl_api = gst_gl_context_get_gl_api (mix->context);
gchar *gl_api_str = gst_gl_api_to_string (gl_api);
gchar *supported_gl_api_str =
gst_gl_api_to_string (mix_class->supported_gl_api);
GST_ELEMENT_ERROR (mix, RESOURCE, BUSY,
("GL API's not compatible context: %s supported: %s", gl_api_str,
supported_gl_api_str), (NULL));
g_free (supported_gl_api_str);
g_free (gl_api_str);
return FALSE;
}
context_error:
{
GST_ELEMENT_ERROR (mix, RESOURCE, NOT_FOUND, ("%s", error->message),
(NULL));
g_clear_error (&error);
return FALSE;
}
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error:
{
GST_ELEMENT_ERROR (mix, LIBRARY, INIT,
("Subclass failed to initialize."), (NULL));
return FALSE;
}
}
static gboolean
_get_gl_context (GstGLBaseMixer * mix)
{
gboolean ret;
g_rec_mutex_lock (&mix->priv->context_lock);
ret = _get_gl_context_unlocked (mix);
g_rec_mutex_unlock (&mix->priv->context_lock);
return ret;
}
static gboolean
gst_gl_base_mixer_propose_allocation (GstAggregator * agg,
GstAggregatorPad * aggpad, GstQuery * decide_query, GstQuery * query)
{
GstGLBaseMixer *mix = GST_GL_BASE_MIXER (agg);
if (!_get_gl_context (mix))
return FALSE;
return TRUE;
}
static gboolean
gst_gl_base_mixer_sink_query (GstAggregator * agg, GstAggregatorPad * bpad,
GstQuery * query)
{
GstGLBaseMixer *mix = GST_GL_BASE_MIXER (agg);
GST_TRACE ("QUERY %" GST_PTR_FORMAT, query);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CONTEXT:
{
GstGLDisplay *display = NULL;
GstGLContext *other = NULL, *local = NULL;
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gboolean ret;
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g_rec_mutex_lock (&mix->priv->context_lock);
if (mix->display)
display = gst_object_ref (mix->display);
if (mix->context)
local = gst_object_ref (mix->context);
if (mix->priv->other_context)
other = gst_object_ref (mix->priv->other_context);
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g_rec_mutex_unlock (&mix->priv->context_lock);
ret = gst_gl_handle_context_query ((GstElement *) mix, query,
display, local, other);
gst_clear_object (&display);
gst_clear_object (&other);
gst_clear_object (&local);
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if (ret)
return ret;
break;
}
default:
break;
}
return GST_AGGREGATOR_CLASS (parent_class)->sink_query (agg, bpad, query);;
}
static void
gst_gl_base_mixer_pad_init (GstGLBaseMixerPad * mixerpad)
{
}
/* GLBaseMixer signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_CONTEXT
};
static gboolean gst_gl_base_mixer_src_query (GstAggregator * agg,
GstQuery * query);
static gboolean
gst_gl_base_mixer_src_activate_mode (GstAggregator * aggregator,
GstPadMode mode, gboolean active);
static gboolean gst_gl_base_mixer_stop (GstAggregator * agg);
static gboolean gst_gl_base_mixer_start (GstAggregator * agg);
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static void gst_gl_base_mixer_finalize (GObject * object);
static void gst_gl_base_mixer_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_gl_base_mixer_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_gl_base_mixer_decide_allocation (GstAggregator * agg,
GstQuery * query);
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static gboolean gst_gl_base_mixer_default_gl_start (GstGLBaseMixer * src);
static void gst_gl_base_mixer_default_gl_stop (GstGLBaseMixer * src);
static void
gst_gl_base_mixer_class_init (GstGLBaseMixerClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
GstAggregatorClass *agg_class = (GstAggregatorClass *) klass;
GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "glmixer", 0, "opengl mixer");
gobject_class = (GObjectClass *) klass;
element_class = GST_ELEMENT_CLASS (klass);
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gobject_class->finalize = gst_gl_base_mixer_finalize;
gobject_class->get_property = gst_gl_base_mixer_get_property;
gobject_class->set_property = gst_gl_base_mixer_set_property;
element_class->set_context =
GST_DEBUG_FUNCPTR (gst_gl_base_mixer_set_context);
element_class->change_state = gst_gl_base_mixer_change_state;
agg_class->sink_query = gst_gl_base_mixer_sink_query;
agg_class->src_query = gst_gl_base_mixer_src_query;
agg_class->src_activate = gst_gl_base_mixer_src_activate_mode;
agg_class->stop = gst_gl_base_mixer_stop;
agg_class->start = gst_gl_base_mixer_start;
agg_class->decide_allocation = gst_gl_base_mixer_decide_allocation;
agg_class->propose_allocation = gst_gl_base_mixer_propose_allocation;
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klass->gl_start = gst_gl_base_mixer_default_gl_start;
klass->gl_stop = gst_gl_base_mixer_default_gl_stop;
g_object_class_install_property (gobject_class, PROP_CONTEXT,
g_param_spec_object ("context",
"OpenGL context",
"Get OpenGL context",
GST_TYPE_GL_CONTEXT, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
/* Register the pad class */
g_type_class_ref (GST_TYPE_GL_BASE_MIXER_PAD);
klass->supported_gl_api = GST_GL_API_ANY;
}
static void
gst_gl_base_mixer_init (GstGLBaseMixer * mix)
{
mix->priv = gst_gl_base_mixer_get_instance_private (mix);
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g_rec_mutex_init (&mix->priv->context_lock);
}
static void
gst_gl_base_mixer_finalize (GObject * object)
{
GstGLBaseMixer *mix = GST_GL_BASE_MIXER (object);
g_rec_mutex_clear (&mix->priv->context_lock);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_gl_base_mixer_default_gl_start (GstGLBaseMixer * src)
{
return TRUE;
}
static void
gst_gl_base_mixer_gl_start (GstGLContext * context, gpointer data)
{
GstGLBaseMixer *src = GST_GL_BASE_MIXER (data);
GstGLBaseMixerClass *src_class = GST_GL_BASE_MIXER_GET_CLASS (src);
GST_INFO_OBJECT (src, "starting");
gst_gl_insert_debug_marker (src->context,
"starting element %s", GST_OBJECT_NAME (src));
src->priv->gl_started = src_class->gl_start (src);
}
static void
gst_gl_base_mixer_default_gl_stop (GstGLBaseMixer * src)
{
}
static void
gst_gl_base_mixer_gl_stop (GstGLContext * context, gpointer data)
{
GstGLBaseMixer *src = GST_GL_BASE_MIXER (data);
GstGLBaseMixerClass *src_class = GST_GL_BASE_MIXER_GET_CLASS (src);
GST_INFO_OBJECT (src, "stopping");
gst_gl_insert_debug_marker (src->context,
"stopping element %s", GST_OBJECT_NAME (src));
if (src->priv->gl_started)
src_class->gl_stop (src);
src->priv->gl_started = FALSE;
}
static void
gst_gl_base_mixer_set_context (GstElement * element, GstContext * context)
{
GstGLBaseMixer *mix = GST_GL_BASE_MIXER (element);
GstGLBaseMixerClass *mix_class = GST_GL_BASE_MIXER_GET_CLASS (mix);
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GstGLDisplay *old_display, *new_display;
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g_rec_mutex_lock (&mix->priv->context_lock);
old_display = mix->display ? gst_object_ref (mix->display) : NULL;
gst_gl_handle_set_context (element, context, &mix->display,
&mix->priv->other_context);
if (mix->display)
gst_gl_display_filter_gl_api (mix->display, mix_class->supported_gl_api);
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new_display = mix->display ? gst_object_ref (mix->display) : NULL;
if (old_display && new_display) {
if (old_display != new_display) {
gst_clear_object (&mix->context);
_get_gl_context_unlocked (mix);
gst_pad_mark_reconfigure (GST_AGGREGATOR_SRC_PAD (mix));
}
}
gst_clear_object (&old_display);
gst_clear_object (&new_display);
g_rec_mutex_unlock (&mix->priv->context_lock);
GST_ELEMENT_CLASS (parent_class)->set_context (element, context);
}
static gboolean
gst_gl_base_mixer_activate (GstGLBaseMixer * mix, gboolean active)
{
GstGLBaseMixerClass *mix_class = GST_GL_BASE_MIXER_GET_CLASS (mix);
gboolean result = TRUE;
if (active) {
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g_rec_mutex_lock (&mix->priv->context_lock);
if (!gst_gl_ensure_element_data (mix, &mix->display,
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&mix->priv->other_context)) {
g_rec_mutex_unlock (&mix->priv->context_lock);
return FALSE;
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}
gst_gl_display_filter_gl_api (mix->display, mix_class->supported_gl_api);
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g_rec_mutex_unlock (&mix->priv->context_lock);
}
return result;
}
static gboolean
gst_gl_base_mixer_src_activate_mode (GstAggregator * aggregator,
GstPadMode mode, gboolean active)
{
GstGLBaseMixer *mix;
gboolean result = FALSE;
mix = GST_GL_BASE_MIXER (aggregator);
switch (mode) {
case GST_PAD_MODE_PUSH:
case GST_PAD_MODE_PULL:
result = gst_gl_base_mixer_activate (mix, active);
break;
default:
result = TRUE;
break;
}
return result;
}
static gboolean
gst_gl_base_mixer_src_query (GstAggregator * agg, GstQuery * query)
{
GstGLBaseMixer *mix = GST_GL_BASE_MIXER (agg);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CONTEXT:
{
GstGLDisplay *display = NULL;
GstGLContext *other = NULL, *local = NULL;
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gboolean ret;
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g_rec_mutex_lock (&mix->priv->context_lock);
if (mix->display)
display = gst_object_ref (mix->display);
if (mix->context)
local = gst_object_ref (mix->context);
if (mix->priv->other_context)
other = gst_object_ref (mix->priv->other_context);
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g_rec_mutex_unlock (&mix->priv->context_lock);
ret = gst_gl_handle_context_query ((GstElement *) mix, query,
display, local, other);
gst_clear_object (&display);
gst_clear_object (&other);
gst_clear_object (&local);
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if (ret)
return ret;
break;
}
default:
break;
}
return GST_AGGREGATOR_CLASS (parent_class)->src_query (agg, query);
}
static gboolean
gst_gl_base_mixer_decide_allocation (GstAggregator * agg, GstQuery * query)
{
GstGLBaseMixer *mix = GST_GL_BASE_MIXER (agg);
if (!_get_gl_context (mix))
return FALSE;
return TRUE;
}
static void
gst_gl_base_mixer_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstGLBaseMixer *mixer = GST_GL_BASE_MIXER (object);
switch (prop_id) {
case PROP_CONTEXT:
g_value_set_object (value, mixer->context);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_gl_base_mixer_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_gl_base_mixer_start (GstAggregator * agg)
{
return GST_AGGREGATOR_CLASS (parent_class)->start (agg);;
}
static gboolean
gst_gl_base_mixer_stop (GstAggregator * agg)
{
GstGLBaseMixer *mix = GST_GL_BASE_MIXER (agg);
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g_rec_mutex_lock (&mix->priv->context_lock);
if (mix->priv->gl_started)
gst_gl_context_thread_add (mix->context, gst_gl_base_mixer_gl_stop, mix);
gst_clear_object (&mix->context);
g_rec_mutex_unlock (&mix->priv->context_lock);
return TRUE;
}
static GstStateChangeReturn
gst_gl_base_mixer_change_state (GstElement * element, GstStateChange transition)
{
GstGLBaseMixer *mix = GST_GL_BASE_MIXER (element);
GstGLBaseMixerClass *mix_class = GST_GL_BASE_MIXER_GET_CLASS (mix);
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GST_DEBUG_OBJECT (mix, "changing state: %s => %s",
gst_element_state_get_name (GST_STATE_TRANSITION_CURRENT (transition)),
gst_element_state_get_name (GST_STATE_TRANSITION_NEXT (transition)));
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
if (!gst_gl_ensure_element_data (element, &mix->display,
&mix->priv->other_context))
return GST_STATE_CHANGE_FAILURE;
gst_gl_display_filter_gl_api (mix->display, mix_class->supported_gl_api);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
if (mix->priv->other_context) {
gst_object_unref (mix->priv->other_context);
mix->priv->other_context = NULL;
}
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g_rec_mutex_lock (&mix->priv->context_lock);
gst_clear_object (&mix->display);
g_rec_mutex_unlock (&mix->priv->context_lock);
break;
default:
break;
}
return ret;
}
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/**
* gst_gl_base_mixer_get_gl_context:
* @mix: a #GstGLBaseMixer
*
* Returns: (transfer full) (nullable): the #GstGLContext found by @mix
*
* Since: 1.18
*/
GstGLContext *
gst_gl_base_mixer_get_gl_context (GstGLBaseMixer * mix)
{
GstGLContext *ret;
g_return_val_if_fail (GST_IS_GL_BASE_MIXER (mix), NULL);
g_rec_mutex_lock (&mix->priv->context_lock);
ret = mix->context ? gst_object_ref (mix->context) : NULL;
g_rec_mutex_unlock (&mix->priv->context_lock);
return ret;
}