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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_GPU_LIBYUV_IMAGE_PROCESSOR_H_
#define MEDIA_GPU_LIBYUV_IMAGE_PROCESSOR_H_
#include <atomic>
#include <memory>
#include <vector>
#include "base/callback_forward.h"
#include "base/macros.h"
#include "base/memory/scoped_refptr.h"
#include "base/task/cancelable_task_tracker.h"
#include "base/threading/thread.h"
#include "base/threading/thread_checker.h"
#include "build/build_config.h"
#include "media/base/video_frame.h"
#include "media/base/video_frame_layout.h"
#include "media/base/video_types.h"
#include "media/gpu/image_processor.h"
#include "media/gpu/media_gpu_export.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"
namespace media {
class VideoFrameMapper;
// A software image processor which uses libyuv to perform format conversion.
// It expects input VideoFrame is mapped into CPU space, and output VideoFrame
// is allocated in user space.
class MEDIA_GPU_EXPORT LibYUVImageProcessor : public ImageProcessor {
public:
// ImageProcessor override
~LibYUVImageProcessor() override;
bool Reset() override;
// Factory method to create LibYUVImageProcessor to convert video format
// specified in input_config and output_config. Provided |error_cb| will be
// posted to the same thread Create() is called if an error occurs after
// initialization.
// Returns nullptr if it fails to create LibYUVImageProcessor.
static std::unique_ptr<LibYUVImageProcessor> Create(
const ImageProcessor::PortConfig& input_config,
const ImageProcessor::PortConfig& output_config,
const ImageProcessor::OutputMode output_mode,
ErrorCB error_cb);
private:
LibYUVImageProcessor(const VideoFrameLayout& input_layout,
const gfx::Size& input_visible_size,
VideoFrame::StorageType input_storage_type,
const VideoFrameLayout& output_layout,
const gfx::Size& output_visible_size,
VideoFrame::StorageType output_storage_type,
std::unique_ptr<VideoFrameMapper> video_frame_mapper,
ErrorCB error_cb);
// ImageProcessor override
#if defined(OS_POSIX) || defined(OS_FUCHSIA)
bool ProcessInternal(scoped_refptr<VideoFrame> frame,
LegacyFrameReadyCB cb) override;
#endif
bool ProcessInternal(scoped_refptr<VideoFrame> input_frame,
scoped_refptr<VideoFrame> output_frame,
FrameReadyCB cb) override;
void ProcessTask(scoped_refptr<VideoFrame> input_frame,
scoped_refptr<VideoFrame> output_frame,
FrameReadyCB cb);
void NotifyError();
// Execute Libyuv function for the conversion from |input| to |output|.
int DoConversion(const VideoFrame* const input, VideoFrame* const output);
const gfx::Rect input_visible_rect_;
const gfx::Rect output_visible_rect_;
std::unique_ptr<VideoFrameMapper> video_frame_mapper_;
// A VideoFrame for intermediate format conversion when there is no direct
// conversion method in libyuv, e.g., RGBA -> I420 (pivot) -> NV12.
scoped_refptr<VideoFrame> intermediate_frame_;
// Error callback to the client.
ErrorCB error_cb_;
// Thread to process frame format conversion.
base::Thread process_thread_;
// CancelableTaskTracker for ProcessTask().
// Because ProcessTask is posted from |client_task_runner_|'s thread to
// another sequence, |process_thread_|, it is unsafe to cancel the posted task
// from |client_task_runner_|'s thread using CancelableCallback and WeakPtr
// binding. CancelableTaskTracker is designed to deal with this scenario.
base::CancelableTaskTracker process_task_tracker_;
// Checker for the thread that creates this LibYUVImageProcessor.
THREAD_CHECKER(client_thread_checker_);
DISALLOW_COPY_AND_ASSIGN(LibYUVImageProcessor);
};
} // namespace media
#endif // MEDIA_GPU_LIBYUV_IMAGE_PROCESSOR_H_
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