gstreamer/subprojects/gst-plugins-bad/sys/msdk/gstmsdkcontextutil.c
Wu Tong c60ac7a04b MSDK: Add _context_query() and avoid compile error on Windows
To avoid compile error on Windows, macro definitions are added to suppress va
variables. In the meantime, add function _context_query() to query
context on Windows.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1693>
2022-02-28 12:54:23 +00:00

379 lines
11 KiB
C

/* GStreamer Intel MSDK plugin
* Copyright (c) 2018, Intel Corporation
* Copyright (c) 2018, Igalia S.L.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGDECE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "gstmsdkcontextutil.h"
#include <gst/va/gstvadisplay.h>
#include <gst/va/gstvautils.h>
GST_DEBUG_CATEGORY_STATIC (GST_CAT_CONTEXT);
static void
_init_context_debug (void)
{
#ifndef GST_DISABLE_GST_DEBUG
static gsize _init = 0;
if (g_once_init_enter (&_init)) {
GST_DEBUG_CATEGORY_GET (GST_CAT_CONTEXT, "GST_CONTEXT");
g_once_init_leave (&_init, 1);
}
#endif
}
#ifdef _WIN32
static gboolean
_pad_query (const GValue * item, GValue * value, gpointer user_data)
{
GstPad *pad = g_value_get_object (item);
GstQuery *query = user_data;
gboolean res;
res = gst_pad_peer_query (pad, query);
if (res) {
g_value_set_boolean (value, TRUE);
return FALSE;
}
GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, pad, "pad peer query failed");
return TRUE;
}
static gboolean
_run_query (GstElement * element, GstQuery * query, GstPadDirection direction)
{
GstIterator *it;
GstIteratorFoldFunction func = _pad_query;
GValue res = G_VALUE_INIT;
g_value_init (&res, G_TYPE_BOOLEAN);
g_value_set_boolean (&res, FALSE);
if (direction == GST_PAD_SRC)
it = gst_element_iterate_src_pads (element);
else
it = gst_element_iterate_sink_pads (element);
while (gst_iterator_fold (it, func, &res, query) == GST_ITERATOR_RESYNC)
gst_iterator_resync (it);
gst_iterator_free (it);
return g_value_get_boolean (&res);
}
static void
_context_query (GstElement * element, const gchar * context_type)
{
GstQuery *query;
GstContext *ctxt = NULL;
/* 2a) Query downstream with GST_QUERY_CONTEXT for the context and
* check if downstream already has a context of the specific type
* 2b) Query upstream as above.
*/
query = gst_query_new_context (context_type);
if (_run_query (element, query, GST_PAD_SRC)) {
gst_query_parse_context (query, &ctxt);
GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, element,
"found context (%p) in downstream query", ctxt);
gst_element_set_context (element, ctxt);
} else if (_run_query (element, query, GST_PAD_SINK)) {
gst_query_parse_context (query, &ctxt);
GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, element,
"found context (%p) in upstream query", ctxt);
gst_element_set_context (element, ctxt);
} else {
/* 3) Post a GST_MESSAGE_NEED_CONTEXT message on the bus with
* the required context type and afterwards check if a
* usable context was set now as in 1). The message could
* be handled by the parent bins of the element and the
* application.
*/
GstMessage *msg;
GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, element,
"posting need context message");
msg = gst_message_new_need_context (GST_OBJECT_CAST (element),
context_type);
gst_element_post_message (element, msg);
}
/*
* Whomever responds to the need-context message performs a
* GstElement::set_context() with the required context in which the element
* is required to update the display_ptr or call gst_va_handle_set_context().
*/
gst_query_unref (query);
}
#endif
/* Find whether the other elements already have a msdk context. */
gboolean
gst_msdk_context_find (GstElement * element, GstMsdkContext ** context_ptr)
{
_init_context_debug ();
g_return_val_if_fail (element != NULL, FALSE);
g_return_val_if_fail (context_ptr != NULL, FALSE);
/* 1) Check if the element already has a context of the specific type. */
if (*context_ptr) {
GST_LOG_OBJECT (element, "already have a context %" GST_PTR_FORMAT,
*context_ptr);
return TRUE;
}
/* This may indirectly set *context_ptr, see function body */
#ifndef _WIN32
gst_va_context_query (element, GST_MSDK_CONTEXT_TYPE_NAME);
#else
_context_query (element, GST_MSDK_CONTEXT_TYPE_NAME);
#endif
if (*context_ptr) {
GST_LOG_OBJECT (element, "found a context %" GST_PTR_FORMAT, *context_ptr);
return TRUE;
}
return *context_ptr != NULL;
}
gboolean
gst_msdk_context_get_context (GstContext * context,
GstMsdkContext ** msdk_context)
{
const GstStructure *structure;
const gchar *type;
_init_context_debug ();
g_return_val_if_fail (GST_IS_CONTEXT (context), FALSE);
type = gst_context_get_context_type (context);
if (!g_strcmp0 (type, GST_MSDK_CONTEXT_TYPE_NAME)) {
structure = gst_context_get_structure (context);
return gst_structure_get (structure, GST_MSDK_CONTEXT_TYPE_NAME,
GST_TYPE_MSDK_CONTEXT, msdk_context, NULL);
}
return FALSE;
}
static void
gst_msdk_context_propagate (GstElement * element, GstMsdkContext * msdk_context)
{
GstContext *context;
GstStructure *structure;
GstMessage *msg;
context = gst_context_new (GST_MSDK_CONTEXT_TYPE_NAME, FALSE);
structure = gst_context_writable_structure (context);
gst_structure_set (structure, GST_MSDK_CONTEXT_TYPE_NAME,
GST_TYPE_MSDK_CONTEXT, msdk_context, NULL);
GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, element,
"posting `have-context' message with MSDK context %" GST_PTR_FORMAT,
msdk_context);
msg = gst_message_new_have_context (GST_OBJECT_CAST (element), context);
if (!gst_element_post_message (element, msg))
GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, element, "No bus attached");
}
/* When we can not find a suitable context from others, we ensure to create
a new context. */
gboolean
gst_msdk_ensure_new_context (GstElement * element, gboolean hardware,
GstMsdkContextJobType job, GstMsdkContext ** context_ptr)
{
GstMsdkContext *msdk_context;
gboolean propagate_display = FALSE;
gboolean ret = FALSE;
g_return_val_if_fail (element, FALSE);
g_return_val_if_fail (context_ptr, FALSE);
_init_context_debug ();
/* 1) Already have. */
if (g_atomic_pointer_get (context_ptr))
return TRUE;
#ifndef _WIN32
/* 2) Query the neighbour the VA display. If already a valid VA display,
using it by gst_msdk_context_from_external_display() in set_context(). */
gst_va_context_query (element, GST_VA_DISPLAY_HANDLE_CONTEXT_TYPE_STR);
msdk_context = g_atomic_pointer_get (context_ptr);
if (msdk_context) {
gst_object_ref (msdk_context);
propagate_display = FALSE;
ret = TRUE;
goto done;
}
#endif
/* 3) Create a MSDK context from scratch. */
msdk_context = gst_msdk_context_new (hardware, job);
if (!msdk_context) {
GST_ERROR_OBJECT (element, "Context creation failed");
return FALSE;
}
propagate_display = TRUE;
ret = TRUE;
GST_INFO_OBJECT (element, "New MSDK Context %p", msdk_context);
gst_object_replace ((GstObject **) context_ptr, (GstObject *) msdk_context);
done:
if (propagate_display) {
#ifndef _WIN32
GstVaDisplay *display =
(GstVaDisplay *) gst_msdk_context_get_display (msdk_context);
gst_va_element_propagate_display_context (element, display);
gst_clear_object (&display);
#endif
}
gst_msdk_context_propagate (element, msdk_context);
gst_object_unref (msdk_context);
return ret;
}
gboolean
gst_msdk_context_from_external_display (GstContext * context, gboolean hardware,
GstMsdkContextJobType job_type, GstMsdkContext ** msdk_context)
{
#ifndef _WIN32
GstObject *va_display = NULL;
const gchar *type;
const GstStructure *s;
GstMsdkContext *ctx = NULL;
_init_context_debug ();
type = gst_context_get_context_type (context);
if (g_strcmp0 (type, GST_VA_DISPLAY_HANDLE_CONTEXT_TYPE_STR))
return FALSE;
s = gst_context_get_structure (context);
if (gst_structure_get (s, "gst-display", GST_TYPE_OBJECT, &va_display, NULL)) {
if (GST_IS_VA_DISPLAY (va_display)) {
/* TODO: Need to check whether the display is the DEV we want. */
ctx =
gst_msdk_context_new_with_va_display (va_display, hardware, job_type);
if (ctx)
*msdk_context = ctx;
}
/* let's try other fields */
gst_clear_object (&va_display);
}
if (ctx)
return TRUE;
#endif
return FALSE;
}
gboolean
gst_msdk_handle_context_query (GstElement * element, GstQuery * query,
GstMsdkContext * msdk_context)
{
const gchar *context_type;
GstContext *ctxt, *old_ctxt;
gboolean ret = FALSE;
_init_context_debug ();
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
g_return_val_if_fail (GST_IS_QUERY (query), FALSE);
g_return_val_if_fail (!msdk_context
|| GST_IS_MSDK_CONTEXT (msdk_context), FALSE);
GST_CAT_LOG_OBJECT (GST_CAT_CONTEXT, element,
"handle context query %" GST_PTR_FORMAT, query);
if (!msdk_context)
return FALSE;
gst_query_parse_context_type (query, &context_type);
gst_query_parse_context (query, &old_ctxt);
if (old_ctxt)
ctxt = gst_context_copy (old_ctxt);
else
ctxt = gst_context_new (context_type, TRUE);
#ifndef _WIN32
if (g_strcmp0 (context_type, GST_VA_DISPLAY_HANDLE_CONTEXT_TYPE_STR) == 0) {
GstStructure *s;
GstObject *display = gst_msdk_context_get_display (msdk_context);
if (display) {
GST_CAT_LOG (GST_CAT_CONTEXT,
"setting GstVaDisplay (%" GST_PTR_FORMAT ") on context (%"
GST_PTR_FORMAT ")", display, ctxt);
s = gst_context_writable_structure (ctxt);
gst_structure_set (s, "gst-display", GST_TYPE_OBJECT, display, NULL);
/* Structure hold one ref */
gst_object_unref (display);
ret = TRUE;
}
} else
#endif
if (g_strcmp0 (context_type, GST_MSDK_CONTEXT_TYPE_NAME) == 0) {
GstStructure *s;
s = gst_context_writable_structure (ctxt);
GST_CAT_LOG (GST_CAT_CONTEXT,
"setting GstMsdkContext (%" GST_PTR_FORMAT ") on context (%"
GST_PTR_FORMAT ")", msdk_context, ctxt);
gst_structure_set (s, GST_MSDK_CONTEXT_TYPE_NAME, GST_TYPE_MSDK_CONTEXT,
msdk_context, NULL);
ret = TRUE;
}
if (ret)
gst_query_set_context (query, ctxt);
gst_context_unref (ctxt);
return ret;
}