mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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242 lines
5.2 KiB
C++
242 lines
5.2 KiB
C++
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/* GStreamer
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* Copyright (C) 2022 Seungha Yang <seungha@centricular.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* SPDX-License-Identifier: MIT
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*/
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#include "win32ipcmmf.h"
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#include "win32ipcutils.h"
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#include <string>
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GST_DEBUG_CATEGORY_EXTERN (gst_win32_ipc_debug);
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#define GST_CAT_DEFAULT gst_win32_ipc_debug
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struct Win32IpcMmf
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{
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explicit Win32IpcMmf (HANDLE f, void * b, UINT32 s, const std::string & n)
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: file (f), buffer (b), size (s), name (n), ref_count (1)
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{
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}
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~Win32IpcMmf ()
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{
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GST_TRACE ("Freeing %p (%s)", this, name.c_str ());
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if (buffer)
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UnmapViewOfFile (buffer);
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if (file)
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CloseHandle (file);
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}
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HANDLE file;
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void *buffer;
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UINT32 size;
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std::string name;
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ULONG ref_count;
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};
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static Win32IpcMmf *
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win32_pic_mmf_new (HANDLE file, UINT32 size, const char * name)
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{
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Win32IpcMmf *self;
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void *buffer;
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std::string msg;
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UINT err_code;
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buffer = MapViewOfFile (file, FILE_MAP_ALL_ACCESS, 0, 0, size);
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if (!buffer) {
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err_code = GetLastError ();
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msg = win32_ipc_error_message (err_code);
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GST_ERROR ("MapViewOfFile failed with 0x%x (%s)",
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err_code, msg.c_str ());
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CloseHandle (file);
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return nullptr;
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}
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self = new Win32IpcMmf (file, buffer, size, name);
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return self;
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}
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/**
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* win32_ipc_mmf_alloc:
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* @size: Size of memory to allocate
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* @name: The name of Memory Mapped File
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*
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* Creates named shared memory
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*
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* Returns: a new Win32IpcMmf object
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*/
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Win32IpcMmf *
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win32_ipc_mmf_alloc (UINT32 size, const char * name)
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{
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HANDLE file;
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std::string msg;
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UINT err_code;
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if (!size) {
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GST_ERROR ("Zero size is not allowed");
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return nullptr;
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}
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if (!name) {
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GST_ERROR ("Name must be specified");
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return nullptr;
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}
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file = CreateFileMappingA (INVALID_HANDLE_VALUE, nullptr,
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PAGE_READWRITE | SEC_COMMIT, 0, size, name);
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if (!file) {
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err_code = GetLastError ();
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msg = win32_ipc_error_message (err_code);
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GST_ERROR ("CreateFileMappingA failed with 0x%x (%s)",
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err_code, msg.c_str ());
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return nullptr;
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}
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/* The name is already occupied, it's caller's fault... */
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if (GetLastError () == ERROR_ALREADY_EXISTS) {
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GST_ERROR ("File already exists");
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CloseHandle (file);
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return nullptr;
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}
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return win32_pic_mmf_new (file, size, name);
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}
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/**
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* win32_ipc_mmf_open:
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* @size: Size of memory to allocate
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* @name: The name of Memory Mapped File
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*
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* Opens named shared memory
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*
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* Returns: a new Win32IpcMmf object
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*/
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Win32IpcMmf *
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win32_ipc_mmf_open (UINT32 size, const char * name)
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{
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HANDLE file;
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std::string msg;
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UINT err_code;
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if (!size) {
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GST_ERROR ("Zero size is not allowed");
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return nullptr;
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}
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if (!name) {
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GST_ERROR ("Name must be specified");
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return nullptr;
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}
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file = OpenFileMappingA (FILE_MAP_ALL_ACCESS, FALSE, name);
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if (!file) {
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err_code = GetLastError ();
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msg = win32_ipc_error_message (err_code);
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GST_ERROR ("OpenFileMappingA failed with 0x%x (%s)",
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err_code, msg.c_str ());
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return nullptr;
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}
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return win32_pic_mmf_new (file, size, name);
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}
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/**
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* win32_ipc_mmf_get_name:
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* @mmf: a Win32IpcMmf object
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*
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* Returns: the name of @mmf
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*/
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const char *
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win32_ipc_mmf_get_name (Win32IpcMmf * mmf)
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{
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if (!mmf)
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return nullptr;
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return mmf->name.c_str ();
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}
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/**
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* win32_ipc_mmf_get_size:
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* @mmf: a Win32IpcMmf object
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*
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* Returns: the size of allocated memory
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*/
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UINT32
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win32_ipc_mmf_get_size (Win32IpcMmf * mmf)
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{
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if (!mmf)
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return 0;
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return mmf->size;
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}
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/**
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* win32_ipc_mmf_get_raw:
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* @mmf: a Win32IpcMmf object
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*
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* Returns: the address of allocated memory
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*/
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void *
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win32_ipc_mmf_get_raw (Win32IpcMmf * mmf)
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{
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if (!mmf)
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return nullptr;
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return mmf->buffer;
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}
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/**
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* win32_ipc_mmf_ref:
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* @mmf: a Win32IpcMmf object
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*
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* Increase ref count
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*/
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Win32IpcMmf *
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win32_ipc_mmf_ref (Win32IpcMmf * mmf)
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{
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if (!mmf)
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return nullptr;
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InterlockedIncrement (&mmf->ref_count);
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return mmf;
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}
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/**
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* win32_ipc_mmf_unref:
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* @mmf: a Win32IpcMmf object
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*
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* Decrease ref count
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*/
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void
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win32_ipc_mmf_unref (Win32IpcMmf * mmf)
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{
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ULONG count;
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if (!mmf)
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return;
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count = InterlockedDecrement (&mmf->ref_count);
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if (count == 0)
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delete mmf;
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}
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