mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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546 lines
15 KiB
C++
546 lines
15 KiB
C++
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/* GStreamer
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* Copyright (C) 2023 Seungha Yang <seungha@centricular.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstwin32ipcmemory.h"
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#include "gstwin32ipcutils.h"
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#include <string>
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#include <mutex>
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#include <string.h>
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GST_DEBUG_CATEGORY_STATIC (gst_win32_ipc_allocator_debug);
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#define GST_CAT_DEFAULT gst_win32_ipc_allocator_debug
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#define GST_WIN32_IPC_MEMORY_NAME "Win32IpcMemory"
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#define GST_WIN32_IPC_ALLOCATOR_IS_FLUSHING(alloc) \
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(g_atomic_int_get (&alloc->flushing))
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static GstWin32IpcAllocator *gc_allocator = nullptr;
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struct _GstWin32IpcAllocator
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{
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GstAllocator parent;
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guint size;
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gboolean is_gc;
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GstAtomicQueue *queue;
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GstPoll *poll;
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gchar *prefix;
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LONG64 seq_num;
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CRITICAL_SECTION lock;
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gboolean started;
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gboolean active;
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/* atomic */
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gint outstanding;
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guint max_mems;
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guint cur_mems;
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gboolean flushing;
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};
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static void gst_win32_ipc_allocator_finalize (GObject * object);
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static GstMemory *gst_win32_ipc_allocator_dummy_alloc (GstAllocator * alloc,
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gsize size, GstAllocationParams * params);
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static void gst_win32_ipc_allocator_free (GstAllocator * alloc,
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GstMemory * mem);
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static gpointer gst_win32_ipc_allocator_map (GstMemory * mem, gsize maxsize,
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GstMapFlags flags);
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static void gst_win32_ipc_allocator_unmap (GstMemory * mem);
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static GstMemory *gst_win32_ipc_allocator_share (GstMemory * mem,
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gssize offset, gssize size);
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static gboolean gst_win32_ipc_allocator_start (GstWin32IpcAllocator * self);
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static gboolean gst_win32_ipc_allocator_stop (GstWin32IpcAllocator * self);
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static gboolean gst_win32_ipc_memory_release (GstMiniObject * mini_object);
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#define gst_win32_ipc_allocator_parent_class parent_class
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G_DEFINE_TYPE (GstWin32IpcAllocator, gst_win32_ipc_allocator,
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GST_TYPE_ALLOCATOR);
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static void
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gst_win32_ipc_allocator_class_init (GstWin32IpcAllocatorClass * klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GstAllocatorClass *alloc_class = GST_ALLOCATOR_CLASS (klass);
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object_class->finalize = gst_win32_ipc_allocator_finalize;
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alloc_class->alloc = gst_win32_ipc_allocator_dummy_alloc;
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alloc_class->free = gst_win32_ipc_allocator_free;
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GST_DEBUG_CATEGORY_INIT (gst_win32_ipc_allocator_debug,
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"win32ipcallocator", 0, "win32ipcallocator");
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}
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static void
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gst_win32_ipc_allocator_init (GstWin32IpcAllocator * self)
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{
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GstAllocator *alloc = GST_ALLOCATOR (self);
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alloc->mem_type = GST_WIN32_IPC_MEMORY_NAME;
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alloc->mem_map = gst_win32_ipc_allocator_map;
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alloc->mem_unmap = gst_win32_ipc_allocator_unmap;
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alloc->mem_share = gst_win32_ipc_allocator_share;
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GST_OBJECT_FLAG_SET (alloc, GST_ALLOCATOR_FLAG_CUSTOM_ALLOC);
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InitializeCriticalSection (&self->lock);
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self->poll = gst_poll_new_timer ();
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self->queue = gst_atomic_queue_new (16);
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self->flushing = 1;
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self->active = FALSE;
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self->started = FALSE;
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/* 1 control write for flushing - the flush token */
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gst_poll_write_control (self->poll);
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/* 1 control write for marking that we are not waiting for poll - the wait token */
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gst_poll_write_control (self->poll);
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}
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static void
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gst_win32_ipc_allocator_finalize (GObject * object)
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{
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GstWin32IpcAllocator *self = GST_WIN32_IPC_ALLOCATOR (object);
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GST_DEBUG_OBJECT (self, "Finalize");
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gst_win32_ipc_allocator_stop (self);
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gst_atomic_queue_unref (self->queue);
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gst_poll_free (self->poll);
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DeleteCriticalSection (&self->lock);
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g_free (self->prefix);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static GstMemory *
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gst_win32_ipc_allocator_dummy_alloc (GstAllocator * alloc, gsize size,
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GstAllocationParams * params)
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{
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g_return_val_if_reached (nullptr);
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}
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static void
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gst_win32_ipc_allocator_free (GstAllocator * alloc, GstMemory * mem)
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{
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GstWin32IpcMemory *imem = (GstWin32IpcMemory *) mem;
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win32_ipc_mmf_unref (imem->mmf);
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g_free (imem);
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}
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static gpointer
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gst_win32_ipc_allocator_map (GstMemory * mem, gsize maxsize, GstMapFlags flags)
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{
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GstWin32IpcMemory *imem = (GstWin32IpcMemory *) mem;
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return win32_ipc_mmf_get_raw (imem->mmf);
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}
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static void
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gst_win32_ipc_allocator_unmap (GstMemory * mem)
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{
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/* do nothing */
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}
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static GstMemory *
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gst_win32_ipc_allocator_share (GstMemory * mem, gssize offset, gssize size)
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{
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/* not supported */
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return nullptr;
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}
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static gboolean
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gst_win32_ipc_allocator_start (GstWin32IpcAllocator * self)
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{
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if (self->started)
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return TRUE;
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self->started = TRUE;
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return TRUE;
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}
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static void
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gst_win32_ipc_allocator_do_set_flushing (GstWin32IpcAllocator * self,
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gboolean flushing)
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{
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if (GST_WIN32_IPC_ALLOCATOR_IS_FLUSHING (self) == flushing)
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return;
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if (flushing) {
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g_atomic_int_set (&self->flushing, 1);
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/* Write the flush token to wake up any waiters */
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gst_poll_write_control (self->poll);
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} else {
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while (!gst_poll_read_control (self->poll)) {
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if (errno == EWOULDBLOCK) {
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/* This should not really happen unless flushing and unflushing
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* happens on different threads. Let's wait a bit to get back flush
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* token from the thread that was setting it to flushing */
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g_thread_yield ();
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continue;
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} else {
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/* Critical error but GstPoll already complained */
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break;
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}
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}
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g_atomic_int_set (&self->flushing, 0);
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}
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}
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gboolean
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gst_win32_ipc_allocator_set_active (GstWin32IpcAllocator * self,
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gboolean active)
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{
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gboolean ret = TRUE;
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g_return_val_if_fail (GST_IS_WIN32_IPC_ALLOCATOR (self), FALSE);
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EnterCriticalSection (&self->lock);
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if (self->active == active)
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goto out;
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if (active) {
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gst_win32_ipc_allocator_start (self);
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/* flush_stop may release memory objects, setting to active to avoid running
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* do_stop while activating the pool */
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self->active = TRUE;
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gst_win32_ipc_allocator_do_set_flushing (self, FALSE);
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} else {
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gint outstanding;
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/* set to flushing first */
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gst_win32_ipc_allocator_do_set_flushing (self, TRUE);
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/* when all memory objects are in the pool, free them. Else they will be
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* freed when they are released */
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outstanding = g_atomic_int_get (&self->outstanding);
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GST_LOG_OBJECT (self, "outstanding memories %d, (in queue %d)",
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outstanding, gst_atomic_queue_length (self->queue));
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if (outstanding == 0) {
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if (!gst_win32_ipc_allocator_stop (self)) {
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GST_ERROR_OBJECT (self, "stop failed");
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ret = FALSE;
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goto out;
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}
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}
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self->active = FALSE;
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}
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out:
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LeaveCriticalSection (&self->lock);
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return ret;
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}
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static void
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gst_win32_ipc_allocator_free_memory (GstWin32IpcAllocator * self,
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GstMemory * mem)
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{
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g_atomic_int_add (&self->cur_mems, -1);
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GST_LOG_OBJECT (self, "freeing memory %p (%u left)", mem, self->cur_mems);
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GST_MINI_OBJECT_CAST (mem)->dispose = nullptr;
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gst_memory_unref (mem);
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}
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/* must be called with the lock */
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static gboolean
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gst_win32_ipc_allocator_clear_queue (GstWin32IpcAllocator * self)
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{
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GstMemory *memory;
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GST_LOG_OBJECT (self, "Clearing queue");
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/* clear the pool */
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while ((memory = (GstMemory *) gst_atomic_queue_pop (self->queue))) {
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while (!gst_poll_read_control (self->poll)) {
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if (errno == EWOULDBLOCK) {
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/* We put the memory into the queue but did not finish writing control
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* yet, let's wait a bit and retry */
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g_thread_yield ();
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continue;
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} else {
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/* Critical error but GstPoll already complained */
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break;
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}
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}
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gst_win32_ipc_allocator_free_memory (self, memory);
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}
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GST_LOG_OBJECT (self, "Clear done");
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return self->cur_mems == 0;
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}
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static gboolean
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gst_win32_ipc_allocator_stop (GstWin32IpcAllocator * self)
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{
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GST_DEBUG_OBJECT (self, "Stop");
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if (self->started) {
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if (!gst_win32_ipc_allocator_clear_queue (self))
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return FALSE;
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self->started = FALSE;
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}
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return TRUE;
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}
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static void
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dec_outstanding (GstWin32IpcAllocator * self)
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{
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if (g_atomic_int_dec_and_test (&self->outstanding)) {
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/* all memory objects are returned to the pool, see if we need to free them */
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if (GST_WIN32_IPC_ALLOCATOR_IS_FLUSHING (self)) {
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/* take the lock so that set_active is not run concurrently */
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EnterCriticalSection (&self->lock);
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/* now that we have the lock, check if we have been de-activated with
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* outstanding buffers */
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if (!self->active)
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gst_win32_ipc_allocator_stop (self);
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LeaveCriticalSection (&self->lock);
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}
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}
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}
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static void
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gst_win32_ipc_allocator_release_memory (GstWin32IpcAllocator * self,
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GstMemory * mem)
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{
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GST_MINI_OBJECT_CAST (mem)->dispose = nullptr;
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mem->allocator = (GstAllocator *) gst_object_ref (gc_allocator);
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/* keep it around in our queue */
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gst_atomic_queue_push (self->queue, mem);
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gst_poll_write_control (self->poll);
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dec_outstanding (self);
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gst_object_unref (self);
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}
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static gboolean
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gst_win32_ipc_memory_release (GstMiniObject * mini_object)
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{
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GstMemory *mem = GST_MEMORY_CAST (mini_object);
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GstWin32IpcAllocator *self;
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g_assert (mem->allocator != nullptr);
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self = GST_WIN32_IPC_ALLOCATOR (mem->allocator);
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/* Memory belongs to garbage collector, free this */
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if (self->is_gc)
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return TRUE;
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if (GST_WIN32_IPC_ALLOCATOR_IS_FLUSHING (self))
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return TRUE;
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/* return the memory to the allocator */
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gst_memory_ref (mem);
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gst_win32_ipc_allocator_release_memory (self, mem);
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return FALSE;
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}
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static GstFlowReturn
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gst_win32_ipc_allocator_alloc (GstWin32IpcAllocator * self, GstMemory ** mem)
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{
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GstWin32IpcMemory *new_mem;
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Win32IpcMmf *mmf;
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std::string mmf_name;
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mmf_name = std::string (self->prefix) +
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std::to_string (InterlockedIncrement64 (&self->seq_num));
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mmf = win32_ipc_mmf_alloc (self->size, mmf_name.c_str ());
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if (!mmf) {
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GST_ERROR_OBJECT (self, "Couldn't allocate memory");
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return GST_FLOW_ERROR;
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}
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memset (win32_ipc_mmf_get_raw (mmf), 0, win32_ipc_mmf_get_size (mmf));
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g_atomic_int_add (&self->cur_mems, 1);
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new_mem = g_new0 (GstWin32IpcMemory, 1);
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gst_memory_init (GST_MEMORY_CAST (new_mem), (GstMemoryFlags) 0,
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GST_ALLOCATOR_CAST (gc_allocator), nullptr, self->size, 0, 0, self->size);
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new_mem->mmf = mmf;
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*mem = GST_MEMORY_CAST (new_mem);
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return GST_FLOW_OK;
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}
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static GstFlowReturn
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gst_win32_ipc_allocator_acquire_memory_internal (GstWin32IpcAllocator * self,
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GstMemory ** memory)
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{
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GstFlowReturn result;
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while (TRUE) {
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if (GST_WIN32_IPC_ALLOCATOR_IS_FLUSHING (self)) {
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GST_DEBUG_OBJECT (self, "We are flushing");
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return GST_FLOW_FLUSHING;
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}
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/* try to get a memory from the queue */
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*memory = (GstMemory *) gst_atomic_queue_pop (self->queue);
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if (*memory) {
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while (!gst_poll_read_control (self->poll)) {
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if (errno == EWOULDBLOCK) {
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/* We put the memory into the queue but did not finish writing control
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* yet, let's wait a bit and retry */
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g_thread_yield ();
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||
|
continue;
|
||
|
} else {
|
||
|
/* Critical error but GstPoll already complained */
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
result = GST_FLOW_OK;
|
||
|
GST_LOG_OBJECT (self, "acquired memory %p", *memory);
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
/* no memory, try to allocate some more */
|
||
|
GST_LOG_OBJECT (self, "no memory, trying to allocate");
|
||
|
result = gst_win32_ipc_allocator_alloc (self, memory);
|
||
|
if (result == GST_FLOW_OK)
|
||
|
/* we have a memory, return it */
|
||
|
break;
|
||
|
|
||
|
if (G_UNLIKELY (result != GST_FLOW_EOS))
|
||
|
/* something went wrong, return error */
|
||
|
break;
|
||
|
|
||
|
/* now we release the control socket, we wait for a memory release or
|
||
|
* flushing */
|
||
|
if (!gst_poll_read_control (self->poll)) {
|
||
|
if (errno == EWOULDBLOCK) {
|
||
|
/* This means that we have two threads trying to allocate memory
|
||
|
* already, and the other one already got the wait token. This
|
||
|
* means that we only have to wait for the poll now and not write the
|
||
|
* token afterwards: we will be woken up once the other thread is
|
||
|
* woken up and that one will write the wait token it removed */
|
||
|
GST_LOG_OBJECT (self, "waiting for free memory or flushing");
|
||
|
gst_poll_wait (self->poll, GST_CLOCK_TIME_NONE);
|
||
|
} else {
|
||
|
/* This is a critical error, GstPoll already gave a warning */
|
||
|
result = GST_FLOW_ERROR;
|
||
|
break;
|
||
|
}
|
||
|
} else {
|
||
|
/* We're the first thread waiting, we got the wait token and have to
|
||
|
* write it again later
|
||
|
* OR
|
||
|
* We're a second thread and just consumed the flush token and block all
|
||
|
* other threads, in which case we must not wait and give it back
|
||
|
* immediately */
|
||
|
if (!GST_WIN32_IPC_ALLOCATOR_IS_FLUSHING (self)) {
|
||
|
GST_LOG_OBJECT (self, "waiting for free memory or flushing");
|
||
|
gst_poll_wait (self->poll, GST_CLOCK_TIME_NONE);
|
||
|
}
|
||
|
gst_poll_write_control (self->poll);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return result;
|
||
|
}
|
||
|
|
||
|
gboolean
|
||
|
gst_is_win32_ipc_memory (GstMemory * mem)
|
||
|
{
|
||
|
return mem != nullptr && mem->allocator != nullptr &&
|
||
|
GST_IS_WIN32_IPC_ALLOCATOR (mem->allocator);
|
||
|
}
|
||
|
|
||
|
static void
|
||
|
gst_win32_ipc_allocator_init_once (void)
|
||
|
{
|
||
|
static std::once_flag once_flag;
|
||
|
std::call_once (once_flag,[]() {
|
||
|
gc_allocator = (GstWin32IpcAllocator *)
|
||
|
g_object_new (GST_TYPE_WIN32_IPC_ALLOCATOR, nullptr);
|
||
|
gst_object_ref_sink (gc_allocator);
|
||
|
GST_OBJECT_FLAG_SET (gc_allocator, GST_OBJECT_FLAG_MAY_BE_LEAKED);
|
||
|
gc_allocator->is_gc = TRUE;
|
||
|
});
|
||
|
}
|
||
|
|
||
|
GstWin32IpcAllocator *
|
||
|
gst_win32_ipc_allocator_new (guint size)
|
||
|
{
|
||
|
GstWin32IpcAllocator *self;
|
||
|
|
||
|
g_return_val_if_fail (size != 0, nullptr);
|
||
|
|
||
|
gst_win32_ipc_allocator_init_once ();
|
||
|
|
||
|
self = (GstWin32IpcAllocator *)
|
||
|
g_object_new (GST_TYPE_WIN32_IPC_ALLOCATOR, nullptr);
|
||
|
self->size = size;
|
||
|
self->prefix = gst_win32_ipc_get_mmf_prefix ();
|
||
|
|
||
|
gst_object_ref_sink (self);
|
||
|
|
||
|
return self;
|
||
|
}
|
||
|
|
||
|
GstFlowReturn
|
||
|
gst_win32_ipc_allocator_acquire_memory (GstWin32IpcAllocator * alloc,
|
||
|
GstMemory ** memory)
|
||
|
{
|
||
|
GstFlowReturn ret;
|
||
|
|
||
|
g_return_val_if_fail (GST_IS_WIN32_IPC_ALLOCATOR (alloc), GST_FLOW_ERROR);
|
||
|
g_return_val_if_fail (memory != nullptr, GST_FLOW_ERROR);
|
||
|
|
||
|
*memory = nullptr;
|
||
|
|
||
|
g_atomic_int_inc (&alloc->outstanding);
|
||
|
ret = gst_win32_ipc_allocator_acquire_memory_internal (alloc, memory);
|
||
|
|
||
|
if (ret == GST_FLOW_OK) {
|
||
|
GstMemory *mem = *memory;
|
||
|
/* Replace default allocator with ours */
|
||
|
gst_object_unref (mem->allocator);
|
||
|
mem->allocator = (GstAllocator *) gst_object_ref (alloc);
|
||
|
GST_MINI_OBJECT_CAST (mem)->dispose = gst_win32_ipc_memory_release;
|
||
|
} else {
|
||
|
dec_outstanding (alloc);
|
||
|
}
|
||
|
|
||
|
return ret;
|
||
|
}
|