webrtc_video_frame_adapter.h | Explore in Territory

// Copyright 2020 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_PLATFORM_WEBRTC_WEBRTC_VIDEO_FRAME_ADAPTER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WEBRTC_WEBRTC_VIDEO_FRAME_ADAPTER_H_

#include "base/feature_list.h"
#include "base/logging.h"
#include "base/memory/raw_ptr.h"
#include "base/synchronization/lock.h"
#include "base/time/default_tick_clock.h"
#include "base/time/time.h"
#include "components/viz/common/gpu/raster_context_provider.h"
#include "media/base/video_frame.h"
#include "media/base/video_frame_converter.h"
#include "media/base/video_frame_pool.h"
#include "media/base/video_types.h"
#include "media/capture/video/video_capture_feedback.h"
#include "media/video/gpu_video_accelerator_factories.h"
#include "media/video/renderable_gpu_memory_buffer_video_frame_pool.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/thread_safe_ref_counted.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
#include "third_party/webrtc/api/scoped_refptr.h"
#include "third_party/webrtc/api/video/video_frame_buffer.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"

namespace blink {

// The WebRtcVideoFrameAdapter implements webrtc::VideoFrameBuffer and is backed
// by one or more media::VideoFrames.
// * Upon CropAndScale(), the crop and scale values are soft-applied.
// * Upon GetMappedFrameBuffer(), any outstanding crop and scale is hard-applied
//   before returning the resulting buffer. This also happens on ToI420().
//
// This eliminates any intermediary downscales by only hard-applying what
// actually needs to be mapped.
//
// When crop and scale is hard-applied, the media::VideoFrame of closest size
// that is greater than or equal the requested size is chosen, minimizing
// scaling costs. If a media::VideoFrame exists in the desired size, no scaling
// is needed.
//
// WebRtcVideoFrameAdapter keeps track of which crops and scales were
// hard-applied during its lifetime.
class PLATFORM_EXPORT WebRtcVideoFrameAdapter
    : public webrtc::VideoFrameBuffer { … };

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WEBRTC_WEBRTC_VIDEO_FRAME_ADAPTER_H_
chromium/third_party/blink/renderer/platform/webrtc/webrtc_video_frame_adapter.h
