/* 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; /** * 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); GstAppleCoreVideoMemory * gst_apple_core_video_memory_new_wrapped (GstAppleCoreVideoPixelBuffer * shared, gsize plane, gsize size); G_END_DECLS #endif /* __GST_APPLE_CORE_VIDEO_MEMORY_H__ */