gstreamer/ges/ges-source.c
Thibault Saunier 6f7d4ac525 ges: Fix smart rendering
Smart rendering has been broken since, mostly forever, but some code
was there pretending it was supported... let's try to stop pretending.

We now keep track of the smart rendering state in the timeline, track
and sources to be able to:

 * tell decodebin to stop plugging more (decoding elements) as soon as
   downstream supports the format.

 * avoid plugging converters after the source element when smart
   rendering.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/198>
2020-07-30 18:44:13 -04:00

226 lines
6.5 KiB
C

/* GStreamer Editing Services
* Copyright (C) 2009 Edward Hervey <edward.hervey@collabora.co.uk>
* 2009 Nokia Corporation
*
* 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.
*/
/**
* SECTION:gessource
* @title: GESSource
* @short_description: Base Class for single-media sources
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "ges-internal.h"
#include "ges/ges-meta-container.h"
#include "ges-track-element.h"
#include "ges-source.h"
#include "ges-layer.h"
#include "gstframepositioner.h"
struct _GESSourcePrivate
{
GstElement *topbin;
GstElement *first_converter;
GstElement *last_converter;
GstPad *ghostpad;
gboolean is_rendering_smartly;
};
G_DEFINE_TYPE_WITH_PRIVATE (GESSource, ges_source, GES_TYPE_TRACK_ELEMENT);
/******************************
* Internal helper methods *
******************************/
static GstElement *
link_elements (GstElement * bin, GPtrArray * elements)
{
GstElement *element, *prev = NULL, *first = NULL;
gint i;
for (i = 0; i < elements->len; i++) {
element = elements->pdata[i];
gst_bin_add (GST_BIN (bin), element);
if (prev) {
if (!gst_element_link_pads_full (prev, "src", element, "sink",
GST_PAD_LINK_CHECK_NOTHING)) {
if (!gst_element_link (prev, element)) {
g_error ("Could not link %s and %s", GST_OBJECT_NAME (prev),
GST_OBJECT_NAME (element));
}
}
}
prev = element;
if (first == NULL)
first = element;
}
return prev;
}
static void
_set_ghost_pad_target (GESSource * self, GstPad * srcpad, GstElement * element)
{
GstPadLinkReturn link_return;
GESSourcePrivate *priv = self->priv;
gboolean use_converter = ! !priv->first_converter;
if (use_converter && priv->is_rendering_smartly) {
GstPad *pad = gst_element_get_static_pad (priv->first_converter, "sink");
use_converter = gst_pad_can_link (srcpad, pad);
gst_object_unref (pad);
}
if (use_converter) {
GstPad *converter_src, *sinkpad;
converter_src = gst_element_get_static_pad (priv->last_converter, "src");
if (!gst_ghost_pad_set_target (GST_GHOST_PAD (priv->ghostpad),
converter_src)) {
GST_ERROR_OBJECT (self, "Could not set ghost target");
}
sinkpad = gst_element_get_static_pad (priv->first_converter, "sink");
link_return = gst_pad_link (srcpad, sinkpad);
#ifndef GST_DISABLE_GST_DEBUG
if (link_return != GST_PAD_LINK_OK) {
GstCaps *srccaps = NULL;
GstCaps *sinkcaps = NULL;
srccaps = gst_pad_query_caps (srcpad, NULL);
sinkcaps = gst_pad_query_caps (sinkpad, NULL);
GST_ERROR_OBJECT (element, "Could not link source with "
"conversion bin: %s (srcpad caps %" GST_PTR_FORMAT
" sinkpad caps: %" GST_PTR_FORMAT ")",
gst_pad_link_get_name (link_return), srccaps, sinkcaps);
gst_caps_unref (srccaps);
gst_caps_unref (sinkcaps);
}
#endif
gst_object_unref (converter_src);
gst_object_unref (sinkpad);
} else {
if (!gst_ghost_pad_set_target (GST_GHOST_PAD (priv->ghostpad), srcpad))
GST_ERROR_OBJECT (self, "Could not set ghost target");
}
gst_element_no_more_pads (element);
}
/* @elements: (transfer-full) */
GstElement *
ges_source_create_topbin (GESSource * source, const gchar * bin_name,
GstElement * sub_element, GPtrArray * elements)
{
GstElement *last;
GstElement *bin;
GstPad *sub_srcpad;
GESSourcePrivate *priv = source->priv;
bin = gst_bin_new (bin_name);
if (!gst_bin_add (GST_BIN (bin), sub_element)) {
GST_ERROR_OBJECT (source, "Could not add sub element: %" GST_PTR_FORMAT,
sub_element);
gst_object_unref (bin);
return NULL;
}
priv->ghostpad = gst_object_ref (gst_ghost_pad_new_no_target ("src",
GST_PAD_SRC));
gst_pad_set_active (priv->ghostpad, TRUE);
gst_element_add_pad (bin, priv->ghostpad);
priv->topbin = gst_object_ref (bin);
last = link_elements (bin, elements);
if (last) {
priv->first_converter = gst_object_ref (elements->pdata[0]);
priv->last_converter = gst_object_ref (last);
}
sub_srcpad = gst_element_get_static_pad (sub_element, "src");
if (sub_srcpad) {
_set_ghost_pad_target (source, sub_srcpad, sub_element);
gst_object_unref (sub_srcpad);
} else {
GST_INFO_OBJECT (source, "Waiting for pad added");
g_signal_connect_swapped (sub_element, "pad-added",
G_CALLBACK (_set_ghost_pad_target), source);
}
g_ptr_array_free (elements, TRUE);
return bin;
}
void
ges_source_set_rendering_smartly (GESSource * source,
gboolean is_rendering_smartly)
{
if (is_rendering_smartly) {
GESTrack *track = ges_track_element_get_track (GES_TRACK_ELEMENT (source));
if (track && ges_track_get_mixing (track)) {
GST_DEBUG_OBJECT (source, "Not rendering smartly as track is mixing!");
source->priv->is_rendering_smartly = FALSE;
return;
}
}
source->priv->is_rendering_smartly = is_rendering_smartly;
}
gboolean
ges_source_get_rendering_smartly (GESSource * source)
{
return source->priv->is_rendering_smartly;
}
static void
ges_source_dispose (GObject * object)
{
GESSourcePrivate *priv = GES_SOURCE (object)->priv;
gst_clear_object (&priv->first_converter);
gst_clear_object (&priv->last_converter);
gst_clear_object (&priv->topbin);
gst_clear_object (&priv->ghostpad);
G_OBJECT_CLASS (ges_source_parent_class)->dispose (object);
}
static void
ges_source_class_init (GESSourceClass * klass)
{
GESTrackElementClass *track_class = GES_TRACK_ELEMENT_CLASS (klass);
GObjectClass *object_class = G_OBJECT_CLASS (klass);
track_class->nleobject_factorytype = "nlesource";
track_class->create_element = NULL;
object_class->dispose = ges_source_dispose;
GES_TRACK_ELEMENT_CLASS_DEFAULT_HAS_INTERNAL_SOURCE (klass) = TRUE;
}
static void
ges_source_init (GESSource * self)
{
self->priv = ges_source_get_instance_private (self);
}