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/* GStreamer Apple Core Video memory
* Copyright (C) 2015 Ilya Konstantinov
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __GST_APPLE_CORE_VIDEO_MEMORY_H__
#define __GST_APPLE_CORE_VIDEO_MEMORY_H__
#include <gst/gst.h>
#include "CoreVideo/CoreVideo.h"
G_BEGIN_DECLS
/**
* GstAppleCoreVideoLockState:
*
* Specifies whether the backing CVPixelBuffer is locked for read-only
* or read-write.
*
* Locking for reading only improves performance by preventing
* Core Video from invalidating existing caches of the buffer’s contents.
*/
typedef enum
{
GST_APPLE_CORE_VIDEO_MEMORY_UNLOCKED,
GST_APPLE_CORE_VIDEO_MEMORY_LOCKED_READONLY,
GST_APPLE_CORE_VIDEO_MEMORY_LOCKED_READ_WRITE
} GstAppleCoreVideoLockState;
/**
* GstAppleCoreVideoPixelBuffer:
*
* This structure wraps CVPixelBuffer, managing its lock states and reference count.
* It will be referenced by one or more #GstAppleCoreVideoMemory.
*/
typedef struct
{
guint refcount;
GMutex mutex;
CVPixelBufferRef buf;
/* Allows mem_map to refuse Read-Write locking a buffer that was previously
* locked for Read-Only. */
GstAppleCoreVideoLockState lock_state;
/* Counts the number of times the buffer was locked.
* Only the first lock affects whether it's just for reading
* or for reading and writing, as reflected in @lock_state. */
guint lock_count;
} GstAppleCoreVideoPixelBuffer;
/**
* GST_APPLE_CORE_VIDEO_NO_PLANE:
*
* Indicates a non-planar pixel buffer.
*/
#define GST_APPLE_CORE_VIDEO_NO_PLANE ((size_t)-1)
/**
* GstAppleCoreVideoMemory:
*
* Represents a video plane or an entire (non-planar) video image,
* backed by a CVPixelBuffer.
*
* This structure shares a #GstAppleCoreVideoPixelBuffer instance
* with other instances.
*/
typedef struct
{
GstMemory mem;
GstAppleCoreVideoPixelBuffer *gpixbuf;
size_t plane;
} GstAppleCoreVideoMemory;
void
gst_apple_core_video_memory_init (void);
GstAppleCoreVideoPixelBuffer *
gst_apple_core_video_pixel_buffer_new (CVPixelBufferRef pixbuf);
GstAppleCoreVideoPixelBuffer *
gst_apple_core_video_pixel_buffer_ref (GstAppleCoreVideoPixelBuffer * shared);
void
gst_apple_core_video_pixel_buffer_unref (GstAppleCoreVideoPixelBuffer * shared);
gboolean
gst_is_apple_core_video_memory (GstMemory * mem);
GstMemory *
gst_apple_core_video_memory_new_wrapped (GstAppleCoreVideoPixelBuffer * shared, gsize plane, gsize size);
G_END_DECLS
#endif /* __GST_APPLE_CORE_VIDEO_MEMORY_H__ */
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