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