gstreamer/subprojects/gst-plugins-bad/sys/win32ipc/gstwin32ipcbufferpool.cpp
Seungha Yang c6a6c56cdf win32ipc: Add support for zero-copy rendering
* Extend protocol so that client can notify of releasing shared memory
* Server will hold shared memory object until it's released by client
* Add allocator/buffer pool to reuse shared memory objects and buffers

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3765>
2023-01-27 18:55:13 +00:00

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/* GStreamer
* Copyright (C) 2023 Seungha Yang <seungha@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 "gstwin32ipcbufferpool.h"
#include "gstwin32ipcmemory.h"
#include <gst/video/video.h>
GST_DEBUG_CATEGORY_STATIC (gst_win32_ipc_buffer_pool_debug);
#define GST_CAT_DEFAULT gst_win32_ipc_buffer_pool_debug
struct _GstWin32IpcBufferPool
{
GstBufferPool parent;
GstWin32IpcAllocator *alloc;
GstVideoInfo info;
gboolean add_videometa;
};
#define gst_win32_ipc_buffer_pool_parent_class parent_class
G_DEFINE_TYPE (GstWin32IpcBufferPool,
gst_win32_ipc_buffer_pool, GST_TYPE_BUFFER_POOL);
static void gst_win32_ipc_buffer_pool_dispose (GObject * object);
static const gchar **gst_win32_ipc_buffer_pool_get_options (GstBufferPool *
pool);
static gboolean gst_win32_ipc_buffer_pool_set_config (GstBufferPool * pool,
GstStructure * config);
static GstFlowReturn gst_win32_ipc_buffer_pool_alloc_buffer (GstBufferPool *
pool, GstBuffer ** buffer, GstBufferPoolAcquireParams * params);
static gboolean gst_win32_ipc_buffer_pool_start (GstBufferPool * pool);
static gboolean gst_win32_ipc_buffer_pool_stop (GstBufferPool * pool);
static void
gst_win32_ipc_buffer_pool_class_init (GstWin32IpcBufferPoolClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstBufferPoolClass *bufferpool_class = GST_BUFFER_POOL_CLASS (klass);
gobject_class->dispose = gst_win32_ipc_buffer_pool_dispose;
bufferpool_class->get_options = gst_win32_ipc_buffer_pool_get_options;
bufferpool_class->set_config = gst_win32_ipc_buffer_pool_set_config;
bufferpool_class->alloc_buffer = gst_win32_ipc_buffer_pool_alloc_buffer;
bufferpool_class->start = gst_win32_ipc_buffer_pool_start;
bufferpool_class->stop = gst_win32_ipc_buffer_pool_stop;
GST_DEBUG_CATEGORY_INIT (gst_win32_ipc_buffer_pool_debug,
"win32_ipcbufferpool", 0, "win32_ipcbufferpool object");
}
static void
gst_win32_ipc_buffer_pool_init (GstWin32IpcBufferPool * self)
{
}
static void
gst_win32_ipc_buffer_pool_dispose (GObject * object)
{
GstWin32IpcBufferPool *self = GST_WIN32_IPC_BUFFER_POOL (object);
if (self->alloc) {
gst_win32_ipc_allocator_set_active (self->alloc, FALSE);
gst_clear_object (&self->alloc);
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static const gchar **
gst_win32_ipc_buffer_pool_get_options (GstBufferPool * pool)
{
static const gchar *options[] = { GST_BUFFER_POOL_OPTION_VIDEO_META,
nullptr
};
return options;
}
static gboolean
gst_win32_ipc_buffer_pool_set_config (GstBufferPool * pool,
GstStructure * config)
{
GstWin32IpcBufferPool *self = GST_WIN32_IPC_BUFFER_POOL (pool);
GstVideoInfo info;
GstCaps *caps = nullptr;
gboolean ret = TRUE;
guint size, min_buffers, max_buffers;
if (!gst_buffer_pool_config_get_params (config, &caps, &size, &min_buffers,
&max_buffers)) {
GST_WARNING_OBJECT (pool, "Invalid config");
return FALSE;
}
if (!caps) {
GST_WARNING_OBJECT (pool, "No caps");
return FALSE;
}
/* now parse the caps from the config */
if (!gst_video_info_from_caps (&info, caps)) {
GST_WARNING_OBJECT (self, "Couldn't get video info from caps");
return FALSE;
}
if (size < info.size) {
GST_WARNING_OBJECT (self, "Size is smaller for the caps");
return FALSE;
}
info.size = MAX (size, info.size);
self->info = info;
GST_LOG_OBJECT (pool, "%dx%d, caps %" GST_PTR_FORMAT, info.width, info.height,
caps);
if (self->alloc) {
gst_win32_ipc_allocator_set_active (self->alloc, FALSE);
gst_clear_object (&self->alloc);
}
self->alloc = gst_win32_ipc_allocator_new (size);
if (!self->alloc) {
GST_ERROR_OBJECT (self, "Couldn't create allocator");
return FALSE;
}
self->add_videometa = gst_buffer_pool_config_has_option (config,
GST_BUFFER_POOL_OPTION_VIDEO_META);
gst_buffer_pool_config_set_params (config,
caps, info.size, min_buffers, max_buffers);
return GST_BUFFER_POOL_CLASS (parent_class)->set_config (pool, config) && ret;
}
static GstFlowReturn
gst_win32_ipc_buffer_pool_alloc_buffer (GstBufferPool * pool,
GstBuffer ** buffer, GstBufferPoolAcquireParams * params)
{
GstWin32IpcBufferPool *self = GST_WIN32_IPC_BUFFER_POOL (pool);
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *buf;
GstMemory *mem = nullptr;
GstVideoInfo *info = &self->info;
ret = gst_win32_ipc_allocator_acquire_memory (self->alloc, &mem);
if (ret != GST_FLOW_OK) {
GST_WARNING_OBJECT (self, "Couldn't acquire memory");
return ret;
}
buf = gst_buffer_new ();
gst_buffer_append_memory (buf, mem);
if (self->add_videometa) {
gst_buffer_add_video_meta_full (buf, GST_VIDEO_FRAME_FLAG_NONE,
GST_VIDEO_INFO_FORMAT (info), GST_VIDEO_INFO_WIDTH (info),
GST_VIDEO_INFO_HEIGHT (info), GST_VIDEO_INFO_N_PLANES (info),
info->offset, info->stride);
}
*buffer = buf;
return GST_FLOW_OK;
}
static gboolean
gst_win32_ipc_buffer_pool_start (GstBufferPool * pool)
{
GstWin32IpcBufferPool *self = GST_WIN32_IPC_BUFFER_POOL (pool);
gboolean ret;
GST_DEBUG_OBJECT (self, "Start");
if (!self->alloc) {
GST_ERROR_OBJECT (self, "No allocator");
return FALSE;
}
if (!gst_win32_ipc_allocator_set_active (self->alloc, TRUE)) {
GST_ERROR_OBJECT (self, "Failed to activate allocator");
return FALSE;
}
ret = GST_BUFFER_POOL_CLASS (parent_class)->start (pool);
if (!ret) {
GST_ERROR_OBJECT (self, "Failed to start");
gst_win32_ipc_allocator_set_active (self->alloc, FALSE);
return FALSE;
}
return TRUE;
}
static gboolean
gst_win32_ipc_buffer_pool_stop (GstBufferPool * pool)
{
GstWin32IpcBufferPool *self = GST_WIN32_IPC_BUFFER_POOL (pool);
GST_DEBUG_OBJECT (self, "Stop");
if (self->alloc)
gst_win32_ipc_allocator_set_active (self->alloc, FALSE);
return GST_BUFFER_POOL_CLASS (parent_class)->stop (pool);
}
GstBufferPool *
gst_win32_ipc_buffer_pool_new (void)
{
GstWin32IpcBufferPool *self;
self = (GstWin32IpcBufferPool *)
g_object_new (GST_TYPE_WIN32_IPC_BUFFER_POOL, nullptr);
gst_object_ref_sink (self);
return GST_BUFFER_POOL_CAST (self);
}