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/*
* Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef WEBRTC_COMMON_VIDEO_INCLUDE_VIDEO_FRAME_BUFFER_H_
#define WEBRTC_COMMON_VIDEO_INCLUDE_VIDEO_FRAME_BUFFER_H_
#include "webrtc/base/callback.h"
#include "webrtc/base/refcount.h"
#include "webrtc/base/scoped_ptr.h"
#include "webrtc/base/scoped_ref_ptr.h"
#include "webrtc/system_wrappers/include/aligned_malloc.h"
namespace webrtc {
enum PlaneType {
kYPlane = 0,
kUPlane = 1,
kVPlane = 2,
kNumOfPlanes = 3,
};
// Interface of a simple frame buffer containing pixel data. This interface does
// not contain any frame metadata such as rotation, timestamp, pixel_width, etc.
class VideoFrameBuffer : public rtc::RefCountInterface {
public:
// Returns true if this buffer has a single exclusive owner.
virtual bool HasOneRef() const = 0;
// The resolution of the frame in pixels. For formats where some planes are
// subsampled, this is the highest-resolution plane.
virtual int width() const = 0;
virtual int height() const = 0;
// Returns pointer to the pixel data for a given plane. The memory is owned by
// the VideoFrameBuffer object and must not be freed by the caller.
virtual const uint8_t* data(PlaneType type) const = 0;
// Non-const data access is disallowed by default. You need to make sure you
// have exclusive access and a writable buffer before calling this function.
virtual uint8_t* MutableData(PlaneType type);
// Returns the number of bytes between successive rows for a given plane.
virtual int stride(PlaneType type) const = 0;
// Return the handle of the underlying video frame. This is used when the
// frame is backed by a texture.
virtual void* native_handle() const = 0;
// Returns a new memory-backed frame buffer converted from this buffer's
// native handle.
virtual rtc::scoped_refptr<VideoFrameBuffer> NativeToI420Buffer() = 0;
protected:
virtual ~VideoFrameBuffer();
};
// Plain I420 buffer in standard memory.
class I420Buffer : public VideoFrameBuffer {
public:
I420Buffer(int width, int height);
I420Buffer(int width, int height, int stride_y, int stride_u, int stride_v);
int width() const override;
int height() const override;
const uint8_t* data(PlaneType type) const override;
// Non-const data access is only allowed if HasOneRef() is true to protect
// against unexpected overwrites.
uint8_t* MutableData(PlaneType type) override;
int stride(PlaneType type) const override;
void* native_handle() const override;
rtc::scoped_refptr<VideoFrameBuffer> NativeToI420Buffer() override;
protected:
~I420Buffer() override;
private:
const int width_;
const int height_;
const int stride_y_;
const int stride_u_;
const int stride_v_;
const rtc::scoped_ptr<uint8_t, AlignedFreeDeleter> data_;
};
// Base class for native-handle buffer is a wrapper around a |native_handle|.
// This is used for convenience as most native-handle implementations can share
// many VideoFrame implementations, but need to implement a few others (such
// as their own destructors or conversion methods back to software I420).
class NativeHandleBuffer : public VideoFrameBuffer {
public:
NativeHandleBuffer(void* native_handle, int width, int height);
int width() const override;
int height() const override;
const uint8_t* data(PlaneType type) const override;
int stride(PlaneType type) const override;
void* native_handle() const override;
protected:
void* native_handle_;
const int width_;
const int height_;
};
class WrappedI420Buffer : public webrtc::VideoFrameBuffer {
public:
WrappedI420Buffer(int width,
int height,
const uint8_t* y_plane,
int y_stride,
const uint8_t* u_plane,
int u_stride,
const uint8_t* v_plane,
int v_stride,
const rtc::Callback0<void>& no_longer_used);
int width() const override;
int height() const override;
const uint8_t* data(PlaneType type) const override;
int stride(PlaneType type) const override;
void* native_handle() const override;
rtc::scoped_refptr<VideoFrameBuffer> NativeToI420Buffer() override;
private:
friend class rtc::RefCountedObject<WrappedI420Buffer>;
~WrappedI420Buffer() override;
const int width_;
const int height_;
const uint8_t* const y_plane_;
const uint8_t* const u_plane_;
const uint8_t* const v_plane_;
const int y_stride_;
const int u_stride_;
const int v_stride_;
rtc::Callback0<void> no_longer_used_cb_;
};
// Helper function to crop |buffer| without making a deep copy. May only be used
// for non-native frames.
rtc::scoped_refptr<VideoFrameBuffer> ShallowCenterCrop(
const rtc::scoped_refptr<VideoFrameBuffer>& buffer,
int cropped_width,
int cropped_height);
} // namespace webrtc
#endif // WEBRTC_COMMON_VIDEO_INCLUDE_VIDEO_FRAME_BUFFER_H_
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