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640a65bf96
volatile is not sufficient to provide atomic guarantees and real atomics should be used instead. GCC 11 has started warning about using volatile with atomic operations. https://gitlab.gnome.org/GNOME/glib/-/merge_requests/1719 Discovered in https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/issues/868 Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2098>
120 lines
4 KiB
C++
120 lines
4 KiB
C++
/* GStreamer
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* Copyright (C) 2020 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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#ifndef __GST_MF_VIDEO_BUFFER_H__
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#define __GST_MF_VIDEO_BUFFER_H__
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#include <gst/gst.h>
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#include <gst/video/video.h>
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#include <windows.h>
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#include <mfobjects.h>
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#include <mferror.h>
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#include <mutex>
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#ifndef __cplusplus
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#error IGstMFVideoBuffer interface doesn't provide C API
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#endif
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/* Define UUID for QueryInterface() */
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class DECLSPEC_UUID("ce922806-a8a6-4e1e-871f-e0cdd5fc9899")
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IGstMFVideoBuffer : public IMFMediaBuffer, public IMF2DBuffer
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{
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public:
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static HRESULT CreateInstance (GstVideoInfo * info,
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IMFMediaBuffer ** buffer);
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static HRESULT CreateInstanceWrapped (GstVideoInfo * info,
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BYTE * data,
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DWORD length,
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IMFMediaBuffer ** buffer);
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/* notify will be called right after this object is destroyed */
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HRESULT SetUserData (gpointer user_data,
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GDestroyNotify notify);
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HRESULT GetUserData (gpointer * user_data);
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/* IUnknown interface */
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STDMETHODIMP_ (ULONG) AddRef (void);
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STDMETHODIMP_ (ULONG) Release (void);
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STDMETHODIMP QueryInterface (REFIID riid,
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void ** object);
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/* IMFMediaBuffer interface
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*
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* Caller of this interface expects returned raw memory layout via Lock()
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* has no padding with default stride. If stored memory layout consists of
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* non-default stride and/or with some padding, then Lock() / Unlock() would
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* cause memory copy therefore.
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* Caller should avoid to use this interface as much as possible
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* if IMF2DBuffer interface available.
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*/
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STDMETHODIMP Lock (BYTE ** buffer,
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DWORD * max_length,
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DWORD * current_length);
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STDMETHODIMP Unlock (void);
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STDMETHODIMP GetCurrentLength (DWORD * length);
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STDMETHODIMP SetCurrentLength (DWORD length);
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STDMETHODIMP GetMaxLength (DWORD * length);
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/* IMF2DBuffer interface
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*
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* this interface supports any raw memory layout with non-default stride.
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* But more complex layout (padding at bottom for instance) is not supported.
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*/
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STDMETHODIMP Lock2D (BYTE ** buffer,
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LONG * pitch);
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STDMETHODIMP Unlock2D (void);
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STDMETHODIMP GetScanline0AndPitch (BYTE ** buffer,
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LONG * pitch);
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STDMETHODIMP IsContiguousFormat (BOOL * contiguous);
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STDMETHODIMP GetContiguousLength (DWORD * length);
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STDMETHODIMP ContiguousCopyTo (BYTE * dest_buffer,
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DWORD dest_buffer_length);
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STDMETHODIMP ContiguousCopyFrom (const BYTE * src_buffer,
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DWORD src_buffer_length);
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private:
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IGstMFVideoBuffer (void);
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~IGstMFVideoBuffer (void);
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HRESULT Initialize (GstVideoInfo * info);
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HRESULT InitializeWrapped (GstVideoInfo * info,
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BYTE * data,
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DWORD length);
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private:
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ULONG ref_count_;
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DWORD current_len_;
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DWORD contiguous_len_;
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BYTE *data_;
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BYTE *contiguous_data_;
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GstVideoInfo *info_;
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GstVideoInfo *contiguous_info_;
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BOOL contiguous_;
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std::mutex lock_;
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bool locked_;
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bool wrapped_;
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gpointer user_data_;
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GDestroyNotify notify_;
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};
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#endif /* __GST_MF_VIDEO_BUFFER_H__ */
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