blob: 1eaa440b221b5b66642b0c4b3811e9234f45c39f [file] [log] [blame]
/*
* GStreamer
* Copyright (C) 2015 Jan Schmidt <jan@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.
*/
/**
* SECTION:element-glstereosplit
*
* Receive a stereoscopic video stream and split into left/right
*
* <refsect2>
* <title>Examples</title>
* |[
* gst-launch-1.0 videotestsrc ! glstereosplit name=s ! queue ! glimagesink s. ! queue ! glimagesink
* ]|
* FBO (Frame Buffer Object) and GLSL (OpenGL Shading Language) are required.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstglstereosplit.h"
#define GST_CAT_DEFAULT gst_gl_stereosplit_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
#define SUPPORTED_GL_APIS GST_GL_API_GLES2 | GST_GL_API_OPENGL | GST_GL_API_OPENGL3
#define DEBUG_INIT \
GST_DEBUG_CATEGORY_INIT (gst_gl_stereosplit_debug, "glstereosplit", 0, "glstereosplit element");
G_DEFINE_TYPE_WITH_CODE (GstGLStereoSplit, gst_gl_stereosplit,
GST_TYPE_ELEMENT, DEBUG_INIT);
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK, GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE_WITH_FEATURES
(GST_CAPS_FEATURE_MEMORY_GL_MEMORY, "RGBA"))
);
static GstStaticPadTemplate src_left_template = GST_STATIC_PAD_TEMPLATE ("left",
GST_PAD_SRC, GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE_WITH_FEATURES
(GST_CAPS_FEATURE_MEMORY_GL_MEMORY, "RGBA"))
);
static GstStaticPadTemplate src_right_template =
GST_STATIC_PAD_TEMPLATE ("right",
GST_PAD_SRC, GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE_WITH_FEATURES
(GST_CAPS_FEATURE_MEMORY_GL_MEMORY,
"RGBA"))
);
static void stereosplit_reset (GstGLStereoSplit * self);
static void stereosplit_finalize (GstGLStereoSplit * self);
static void stereosplit_set_context (GstElement * element,
GstContext * context);
static GstFlowReturn stereosplit_chain (GstPad * pad, GstGLStereoSplit * split,
GstBuffer * buf);
static GstStateChangeReturn stereosplit_change_state (GstElement * element,
GstStateChange transition);
static gboolean stereosplit_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static gboolean stereosplit_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean stereosplit_src_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static gboolean stereosplit_src_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean ensure_context (GstGLStereoSplit * self);
static void
gst_gl_stereosplit_class_init (GstGLStereoSplitClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_set_static_metadata (element_class,
"GLStereoSplit", "Codec/Converter",
"Splits a stereoscopic stream into separate left/right streams",
"Jan Schmidt <jan@centricular.com>\n"
"Matthew Waters <matthew@centricular.com>");
gobject_class->finalize = (GObjectFinalizeFunc) (stereosplit_finalize);
element_class->change_state = stereosplit_change_state;
element_class->set_context = stereosplit_set_context;
gst_element_class_add_static_pad_template (element_class, &sink_template);
gst_element_class_add_static_pad_template (element_class, &src_left_template);
gst_element_class_add_static_pad_template (element_class,
&src_right_template);
}
static void
gst_gl_stereosplit_init (GstGLStereoSplit * self)
{
GstPad *pad;
pad = self->sink_pad =
gst_pad_new_from_static_template (&sink_template, "sink");
gst_pad_set_chain_function (pad, (GstPadChainFunction) (stereosplit_chain));
gst_pad_set_query_function (pad, stereosplit_sink_query);
gst_pad_set_event_function (pad, stereosplit_sink_event);
gst_element_add_pad (GST_ELEMENT (self), self->sink_pad);
pad = self->left_pad =
gst_pad_new_from_static_template (&src_left_template, "left");
gst_pad_set_query_function (pad, stereosplit_src_query);
gst_pad_set_event_function (pad, stereosplit_src_event);
gst_element_add_pad (GST_ELEMENT (self), self->left_pad);
pad = self->right_pad =
gst_pad_new_from_static_template (&src_right_template, "right");
gst_pad_set_query_function (pad, stereosplit_src_query);
gst_pad_set_event_function (pad, stereosplit_src_event);
gst_element_add_pad (GST_ELEMENT (self), self->right_pad);
self->viewconvert = gst_gl_view_convert_new ();
}
static void
stereosplit_reset (GstGLStereoSplit * self)
{
if (self->context)
gst_object_replace ((GstObject **) & self->context, NULL);
if (self->display)
gst_object_replace ((GstObject **) & self->display, NULL);
}
static void
stereosplit_finalize (GstGLStereoSplit * self)
{
GObjectClass *klass = G_OBJECT_CLASS (gst_gl_stereosplit_parent_class);
if (self->viewconvert)
gst_object_replace ((GstObject **) & self->viewconvert, NULL);
klass->finalize ((GObject *) (self));
}
static void
stereosplit_set_context (GstElement * element, GstContext * context)
{
GstGLStereoSplit *stereosplit = GST_GL_STEREOSPLIT (element);
gst_gl_handle_set_context (element, context, &stereosplit->display,
&stereosplit->other_context);
if (stereosplit->display)
gst_gl_display_filter_gl_api (stereosplit->display, SUPPORTED_GL_APIS);
GST_ELEMENT_CLASS (gst_gl_stereosplit_parent_class)->set_context (element,
context);
}
static GstStateChangeReturn
stereosplit_change_state (GstElement * element, GstStateChange transition)
{
GstGLStereoSplit *stereosplit = GST_GL_STEREOSPLIT (element);
GstStateChangeReturn result;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
if (!gst_gl_ensure_element_data (element, &stereosplit->display,
&stereosplit->other_context))
return GST_STATE_CHANGE_FAILURE;
gst_gl_display_filter_gl_api (stereosplit->display, SUPPORTED_GL_APIS);
break;
default:
break;
}
result =
GST_ELEMENT_CLASS (gst_gl_stereosplit_parent_class)->change_state
(element, transition);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
if (stereosplit->other_context) {
gst_object_unref (stereosplit->other_context);
stereosplit->other_context = NULL;
}
if (stereosplit->display) {
gst_object_unref (stereosplit->display);
stereosplit->display = NULL;
}
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
stereosplit_reset (stereosplit);
break;
default:
break;
}
return result;
}
static GstCaps *
stereosplit_transform_caps (GstGLStereoSplit * self, GstPadDirection direction,
GstCaps * caps, GstCaps * filter)
{
GstCaps *next_caps;
/* FIXME: Is this the right way to ensure a context here ? */
if (!ensure_context (self))
return NULL;
next_caps =
gst_gl_view_convert_transform_caps (self->viewconvert, direction, caps,
NULL);
return next_caps;
}
static GstCaps *
strip_mview_fields (GstCaps * incaps, GstVideoMultiviewFlags keep_flags)
{
GstCaps *outcaps = gst_caps_make_writable (incaps);
gint i, n;
n = gst_caps_get_size (outcaps);
for (i = 0; i < n; i++) {
GstStructure *st = gst_caps_get_structure (outcaps, i);
GstVideoMultiviewFlags flags, mask;
gst_structure_remove_field (st, "multiview-mode");
if (gst_structure_get_flagset (st, "multiview-flags", &flags, &mask)) {
flags &= keep_flags;
mask = keep_flags;
gst_structure_set (st, "multiview-flags",
GST_TYPE_VIDEO_MULTIVIEW_FLAGSET, flags, mask, NULL);
}
}
return outcaps;
}
static gboolean stereosplit_do_bufferpool (GstGLStereoSplit * self,
GstCaps * caps);
static GstCaps *
stereosplit_get_src_caps (GstGLStereoSplit * split,
GstPad * pad, GstVideoMultiviewMode preferred_mode)
{
GstCaps *outcaps, *tmp, *templ_caps;
GValue item = G_VALUE_INIT, list = G_VALUE_INIT;
/* Get the template format */
templ_caps = gst_pad_get_pad_template_caps (pad);
/* And limit down to the preferred mode or mono */
templ_caps = gst_caps_make_writable (templ_caps);
g_value_init (&item, G_TYPE_STRING);
g_value_init (&list, GST_TYPE_LIST);
g_value_set_static_string (&item,
gst_video_multiview_mode_to_caps_string (preferred_mode));
gst_value_list_append_value (&list, &item);
g_value_set_static_string (&item,
gst_video_multiview_mode_to_caps_string (GST_VIDEO_MULTIVIEW_MODE_MONO));
gst_value_list_append_value (&list, &item);
gst_caps_set_value (templ_caps, "multiview-mode", &list);
g_value_unset (&list);
g_value_unset (&item);
/* And intersect with the peer */
if ((tmp = gst_pad_peer_query_caps (pad, NULL)) == NULL) {
gst_caps_unref (templ_caps);
return NULL;
}
outcaps = gst_caps_intersect_full (tmp, templ_caps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (tmp);
gst_caps_unref (templ_caps);
GST_DEBUG_OBJECT (split, "Src pad %" GST_PTR_FORMAT " caps %" GST_PTR_FORMAT,
pad, outcaps);
return outcaps;
}
static gboolean
stereosplit_set_output_caps (GstGLStereoSplit * split, GstCaps * sinkcaps)
{
GstCaps *left = NULL, *right = NULL, *tridcaps = NULL;
GstCaps *tmp, *combined;
gboolean res = FALSE;
/* Choose some preferred output caps.
* Keep input width/height and PAR, preserve preferred output
* multiview flags for flipping/flopping if any, and set each
* left right pad to either left/mono and right/mono, as they prefer
*/
/* Calculate what downstream can collectively support */
left =
stereosplit_get_src_caps (split, split->left_pad,
GST_VIDEO_MULTIVIEW_MODE_LEFT);
if (left == NULL)
goto fail;
right =
stereosplit_get_src_caps (split, split->right_pad,
GST_VIDEO_MULTIVIEW_MODE_RIGHT);
if (right == NULL)
goto fail;
tridcaps = stereosplit_transform_caps (split, GST_PAD_SINK, sinkcaps, NULL);
if (!tridcaps || gst_caps_is_empty (tridcaps)) {
GST_ERROR_OBJECT (split,
"Failed to transform input caps %" GST_PTR_FORMAT, sinkcaps);
goto fail;
}
/* Preserve downstream preferred flipping/flopping */
tmp =
strip_mview_fields (gst_caps_ref (left),
GST_VIDEO_MULTIVIEW_FLAGS_LEFT_FLIPPED |
GST_VIDEO_MULTIVIEW_FLAGS_LEFT_FLOPPED);
combined = gst_caps_intersect (tridcaps, tmp);
gst_caps_unref (tridcaps);
gst_caps_unref (tmp);
tridcaps = combined;
tmp =
strip_mview_fields (gst_caps_ref (right),
GST_VIDEO_MULTIVIEW_FLAGS_RIGHT_FLIPPED |
GST_VIDEO_MULTIVIEW_FLAGS_RIGHT_FLOPPED);
combined = gst_caps_intersect (tridcaps, tmp);
gst_caps_unref (tridcaps);
gst_caps_unref (tmp);
tridcaps = combined;
if (G_UNLIKELY (gst_caps_is_empty (tridcaps))) {
gst_caps_unref (tridcaps);
goto fail;
}
/* Now generate the version for each output pad */
GST_DEBUG_OBJECT (split, "Attempting to set output caps %" GST_PTR_FORMAT,
tridcaps);
tmp = gst_caps_intersect (tridcaps, left);
gst_caps_unref (left);
left = tmp;
left = gst_caps_fixate (left);
if (!gst_pad_set_caps (split->left_pad, left)) {
GST_ERROR_OBJECT (split,
"Failed to set left output caps %" GST_PTR_FORMAT, left);
goto fail;
}
tmp = gst_caps_intersect (tridcaps, right);
gst_caps_unref (right);
right = tmp;
right = gst_caps_fixate (right);
if (!gst_pad_set_caps (split->right_pad, right)) {
GST_ERROR_OBJECT (split,
"Failed to set right output caps %" GST_PTR_FORMAT, right);
goto fail;
}
gst_gl_view_convert_set_context (split->viewconvert, split->context);
tridcaps = gst_caps_make_writable (tridcaps);
gst_caps_set_simple (tridcaps, "multiview-mode", G_TYPE_STRING,
"separated", "views", G_TYPE_INT, 2, NULL);
tridcaps = gst_caps_fixate (tridcaps);
if (!gst_gl_view_convert_set_caps (split->viewconvert, sinkcaps, tridcaps)) {
GST_ERROR_OBJECT (split, "Failed to set caps on converter");
goto fail;
}
/* FIXME: Provide left and right caps to do_bufferpool */
stereosplit_do_bufferpool (split, left);
res = TRUE;
fail:
if (left)
gst_caps_unref (left);
if (right)
gst_caps_unref (right);
if (tridcaps)
gst_caps_unref (tridcaps);
return res;
}
static gboolean
_find_local_gl_context (GstGLStereoSplit * split)
{
GstQuery *query;
GstContext *context;
const GstStructure *s;
if (split->context)
return TRUE;
query = gst_query_new_context ("gst.gl.local_context");
if (!split->context
&& gst_gl_run_query (GST_ELEMENT (split), query, GST_PAD_SRC)) {
gst_query_parse_context (query, &context);
if (context) {
s = gst_context_get_structure (context);
gst_structure_get (s, "context", GST_GL_TYPE_CONTEXT, &split->context,
NULL);
}
}
if (!split->context
&& gst_gl_run_query (GST_ELEMENT (split), query, GST_PAD_SINK)) {
gst_query_parse_context (query, &context);
if (context) {
s = gst_context_get_structure (context);
gst_structure_get (s, "context", GST_GL_TYPE_CONTEXT, &split->context,
NULL);
}
}
GST_DEBUG_OBJECT (split, "found local context %p", split->context);
gst_query_unref (query);
if (split->context)
return TRUE;
return FALSE;
}
static gboolean
ensure_context (GstGLStereoSplit * self)
{
GError *error = NULL;
if (!gst_gl_ensure_element_data (self, &self->display, &self->other_context))
return FALSE;
gst_gl_display_filter_gl_api (self->display, SUPPORTED_GL_APIS);
_find_local_gl_context (self);
if (!self->context) {
GST_OBJECT_LOCK (self->display);
do {
if (self->context)
gst_object_unref (self->context);
/* just get a GL context. we don't care */
self->context =
gst_gl_display_get_gl_context_for_thread (self->display, NULL);
if (!self->context) {
if (!gst_gl_display_create_context (self->display, self->other_context,
&self->context, &error)) {
GST_OBJECT_UNLOCK (self->display);
goto context_error;
}
}
} while (!gst_gl_display_add_context (self->display, self->context));
GST_OBJECT_UNLOCK (self->display);
}
{
GstGLAPI current_gl_api = gst_gl_context_get_gl_api (self->context);
if ((current_gl_api & (SUPPORTED_GL_APIS)) == 0)
goto unsupported_gl_api;
}
return TRUE;
unsupported_gl_api:
{
GstGLAPI gl_api = gst_gl_context_get_gl_api (self->context);
gchar *gl_api_str = gst_gl_api_to_string (gl_api);
gchar *supported_gl_api_str = gst_gl_api_to_string (SUPPORTED_GL_APIS);
GST_ELEMENT_ERROR (self, 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 (self, RESOURCE, NOT_FOUND, ("%s", error->message),
(NULL));
g_clear_error (&error);
return FALSE;
}
}
static gboolean
stereosplit_decide_allocation (GstGLStereoSplit * self, GstQuery * query)
{
if (!ensure_context (self))
return FALSE;
return TRUE;
}
static gboolean
stereosplit_propose_allocation (GstGLStereoSplit * self, GstQuery * query)
{
if (!gst_gl_ensure_element_data (self, &self->display, &self->other_context))
return FALSE;
return TRUE;
}
static gboolean
stereosplit_do_bufferpool (GstGLStereoSplit * self, GstCaps * caps)
{
GstQuery *query;
query = gst_query_new_allocation (caps, TRUE);
if (!gst_pad_peer_query (self->left_pad, query)) {
if (!gst_pad_peer_query (self->right_pad, query)) {
GST_DEBUG_OBJECT (self, "peer ALLOCATION query failed on both src pads");
}
}
if (!stereosplit_decide_allocation (self, query)) {
gst_query_unref (query);
return FALSE;
}
gst_query_unref (query);
return TRUE;
}
static GstFlowReturn
stereosplit_chain (GstPad * pad, GstGLStereoSplit * split, GstBuffer * buf)
{
GstBuffer *left, *right;
GstBuffer *split_buffer = NULL;
GstFlowReturn ret;
gint i, n_planes;
n_planes = GST_VIDEO_INFO_N_PLANES (&split->viewconvert->out_info);
GST_LOG_OBJECT (split, "chaining buffer %" GST_PTR_FORMAT, buf);
if (gst_gl_view_convert_submit_input_buffer (split->viewconvert,
GST_BUFFER_IS_DISCONT (buf), buf) != GST_FLOW_OK) {
GST_ELEMENT_ERROR (split, RESOURCE, NOT_FOUND, ("%s",
"Failed to 3d convert buffer"),
("Could not get submit input buffer"));
return GST_FLOW_ERROR;
}
ret = gst_gl_view_convert_get_output (split->viewconvert, &split_buffer);
if (ret != GST_FLOW_OK) {
GST_ELEMENT_ERROR (split, RESOURCE, NOT_FOUND, ("%s",
"Failed to 3d convert buffer"), ("Could not get output buffer"));
return GST_FLOW_ERROR;
}
if (split_buffer == NULL)
return GST_FLOW_OK; /* Need another input buffer */
left = gst_buffer_new ();
gst_buffer_copy_into (left, buf,
GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS, 0, -1);
GST_BUFFER_FLAG_UNSET (left, GST_VIDEO_BUFFER_FLAG_FIRST_IN_BUNDLE);
gst_buffer_add_parent_buffer_meta (left, split_buffer);
for (i = 0; i < n_planes; i++) {
GstMemory *mem = gst_buffer_get_memory (split_buffer, i);
gst_buffer_append_memory (left, mem);
}
ret = gst_pad_push (split->left_pad, gst_buffer_ref (left));
/* Allow unlinked on the first pad - as long as the 2nd isn't unlinked */
gst_buffer_unref (left);
if (G_UNLIKELY (ret != GST_FLOW_OK && ret != GST_FLOW_NOT_LINKED)) {
gst_buffer_unref (split_buffer);
return ret;
}
right = gst_buffer_new ();
gst_buffer_copy_into (right, buf,
GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS, 0, -1);
GST_BUFFER_FLAG_UNSET (left, GST_VIDEO_BUFFER_FLAG_FIRST_IN_BUNDLE);
gst_buffer_add_parent_buffer_meta (right, split_buffer);
for (i = n_planes; i < n_planes * 2; i++) {
GstMemory *mem = gst_buffer_get_memory (split_buffer, i);
gst_buffer_append_memory (right, mem);
}
ret = gst_pad_push (split->right_pad, gst_buffer_ref (right));
gst_buffer_unref (right);
gst_buffer_unref (split_buffer);
return ret;
}
static gboolean
stereosplit_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstGLStereoSplit *split = GST_GL_STEREOSPLIT (parent);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CONTEXT:
{
const gchar *context_type;
GstContext *context, *old_context;
gboolean ret;
ret = gst_gl_handle_context_query ((GstElement *) split, query,
&split->display, &split->other_context);
if (split->display)
gst_gl_display_filter_gl_api (split->display, SUPPORTED_GL_APIS);
gst_query_parse_context_type (query, &context_type);
if (g_strcmp0 (context_type, "gst.gl.local_context") == 0) {
GstStructure *s;
gst_query_parse_context (query, &old_context);
if (old_context)
context = gst_context_copy (old_context);
else
context = gst_context_new ("gst.gl.local_context", FALSE);
s = gst_context_writable_structure (context);
gst_structure_set (s, "context", GST_GL_TYPE_CONTEXT, split->context,
NULL);
gst_query_set_context (query, context);
gst_context_unref (context);
ret = split->context != NULL;
}
GST_LOG_OBJECT (split, "context query of type %s %i", context_type, ret);
if (ret)
return ret;
return gst_pad_query_default (pad, parent, query);
}
/* FIXME: Handle caps query */
default:
return gst_pad_query_default (pad, parent, query);
}
}
static gboolean
stereosplit_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
return gst_pad_event_default (pad, parent, event);
}
static gboolean
stereosplit_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstGLStereoSplit *split = GST_GL_STEREOSPLIT (parent);
GST_DEBUG_OBJECT (split, "sink query %s",
gst_query_type_get_name (GST_QUERY_TYPE (query)));
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CONTEXT:
{
const gchar *context_type;
GstContext *context, *old_context;
gboolean ret;
ret = gst_gl_handle_context_query ((GstElement *) split, query,
&split->display, &split->other_context);
if (split->display)
gst_gl_display_filter_gl_api (split->display, SUPPORTED_GL_APIS);
gst_query_parse_context_type (query, &context_type);
if (g_strcmp0 (context_type, "gst.gl.local_context") == 0) {
GstStructure *s;
gst_query_parse_context (query, &old_context);
if (old_context)
context = gst_context_copy (old_context);
else
context = gst_context_new ("gst.gl.local_context", FALSE);
s = gst_context_writable_structure (context);
gst_structure_set (s, "context", GST_GL_TYPE_CONTEXT, split->context,
NULL);
gst_query_set_context (query, context);
gst_context_unref (context);
ret = split->context != NULL;
}
GST_LOG_OBJECT (split, "context query of type %s %i", context_type, ret);
if (ret)
return ret;
return gst_pad_query_default (pad, parent, query);
}
case GST_QUERY_ALLOCATION:
{
return stereosplit_propose_allocation (split, query);
}
case GST_QUERY_ACCEPT_CAPS:
{
GstCaps *possible, *caps;
gboolean allowed;
gst_query_parse_accept_caps (query, &caps);
if (!(possible = gst_pad_query_caps (split->sink_pad, caps)))
return FALSE;
allowed = gst_caps_is_subset (caps, possible);
gst_caps_unref (possible);
gst_query_set_accept_caps_result (query, allowed);
return allowed;
}
case GST_QUERY_CAPS:
{
GstCaps *filter, *left, *right, *combined, *ret, *templ_caps;
gst_query_parse_caps (query, &filter);
/* Calculate what downstream can collectively support */
if (!(left = gst_pad_peer_query_caps (split->left_pad, NULL)))
return FALSE;
if (!(right = gst_pad_peer_query_caps (split->right_pad, NULL)))
return FALSE;
/* Strip out multiview mode and flags that might break the
* intersection, since we can convert.
* We could keep downstream preferred flip/flopping and list
* separated as preferred in the future which might
* theoretically allow us an easier conversion, but it's not essential
*/
left = strip_mview_fields (left, GST_VIDEO_MULTIVIEW_FLAGS_NONE);
right = strip_mview_fields (right, GST_VIDEO_MULTIVIEW_FLAGS_NONE);
combined = gst_caps_intersect (left, right);
gst_caps_unref (left);
gst_caps_unref (right);
/* Intersect peer caps with our template formats */
templ_caps = gst_pad_get_pad_template_caps (split->left_pad);
ret =
gst_caps_intersect_full (combined, templ_caps,
GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (templ_caps);
gst_caps_unref (combined);
combined = ret;
if (!combined || gst_caps_is_empty (combined)) {
gst_caps_unref (combined);
return FALSE;
}
/* Convert from the src pad caps to input formats we support */
ret = stereosplit_transform_caps (split, GST_PAD_SRC, combined, filter);
gst_caps_unref (combined);
combined = ret;
/* Intersect with the sink pad template then */
templ_caps = gst_pad_get_pad_template_caps (split->sink_pad);
ret =
gst_caps_intersect_full (combined, templ_caps,
GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (templ_caps);
GST_LOG_OBJECT (split, "Returning sink pad caps %" GST_PTR_FORMAT, ret);
gst_query_set_caps_result (query, ret);
return !gst_caps_is_empty (ret);
}
default:
return gst_pad_query_default (pad, parent, query);
}
}
static gboolean
stereosplit_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstGLStereoSplit *split = GST_GL_STEREOSPLIT (parent);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
return stereosplit_set_output_caps (split, caps);
}
default:
return gst_pad_event_default (pad, parent, event);
}
}