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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_WEBCODECS_BACKGROUND_READBACK_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBCODECS_BACKGROUND_READBACK_H_
#include "base/functional/callback.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/single_thread_task_runner.h"
#include "base/task/thread_pool.h"
#include "base/types/pass_key.h"
#include "media/base/video_frame.h"
#include "media/base/video_frame_pool.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/modules/modules_export.h"
#include "third_party/blink/renderer/modules/webcodecs/video_frame_layout.h"
#include "third_party/blink/renderer/platform/supplementable.h"
#include "third_party/skia/include/gpu/ganesh/GrTypes.h"
namespace blink {
class SyncReadbackThread;
// This class moves synchronous VideoFrame readback to a separate worker
// thread to avoid blocking the main thread.
class MODULES_EXPORT BackgroundReadback
: public GarbageCollected<BackgroundReadback>,
public Supplement<ExecutionContext> {
public:
using ReadbackToFrameDoneCallback =
base::OnceCallback<void(scoped_refptr<media::VideoFrame>)>;
using ReadbackDoneCallback = base::OnceCallback<void(bool)>;
explicit BackgroundReadback(base::PassKey<BackgroundReadback> key,
ExecutionContext& context);
virtual ~BackgroundReadback();
static const char kSupplementName[];
static BackgroundReadback* From(ExecutionContext& context);
void ReadbackTextureBackedFrameToMemoryFrame(
scoped_refptr<media::VideoFrame> txt_frame,
ReadbackToFrameDoneCallback result_cb);
void ReadbackTextureBackedFrameToBuffer(
scoped_refptr<media::VideoFrame> txt_frame,
const gfx::Rect& src_rect,
const VideoFrameLayout& dest_layout,
base::span<uint8_t> dest_buffer,
ReadbackDoneCallback done_cb);
void Trace(Visitor* visitor) const override {
Supplement<ExecutionContext>::Trace(visitor);
}
private:
void ReadbackOnThread(scoped_refptr<media::VideoFrame> txt_frame,
ReadbackToFrameDoneCallback result_cb);
void ReadbackOnThread(scoped_refptr<media::VideoFrame> txt_frame,
const gfx::Rect& src_rect,
const VideoFrameLayout& dest_layout,
base::span<uint8_t> dest_buffer,
ReadbackDoneCallback done_cb);
void ReadbackRGBTextureBackedFrameToMemory(
scoped_refptr<media::VideoFrame> txt_frame,
ReadbackToFrameDoneCallback result_cb);
void OnARGBPixelsFrameReadCompleted(
ReadbackToFrameDoneCallback result_cb,
scoped_refptr<media::VideoFrame> txt_frame,
scoped_refptr<media::VideoFrame> result_frame,
bool success);
void ReadbackRGBTextureBackedFrameToBuffer(
scoped_refptr<media::VideoFrame> txt_frame,
const gfx::Rect& src_rect,
const VideoFrameLayout& dest_layout,
base::span<uint8_t> dest_buffer,
ReadbackDoneCallback done_cb);
void OnARGBPixelsBufferReadCompleted(
scoped_refptr<media::VideoFrame> txt_frame,
const gfx::Rect& src_rect,
const VideoFrameLayout& dest_layout,
base::span<uint8_t> dest_buffer,
ReadbackDoneCallback done_cb,
bool success);
// Lives and dies on the worker thread.
scoped_refptr<SyncReadbackThread> sync_readback_impl_;
scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner_;
media::VideoFramePool result_frame_pool_;
SEQUENCE_CHECKER(sequence_checker_);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBCODECS_BACKGROUND_READBACK_H_
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