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// Copyright 2019 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.
#include <memory>
#include "base/memory/scoped_refptr.h"
#include "media/base/video_codecs.h"
#include "media/gpu/chromeos/fourcc.h"
#include "media/gpu/chromeos/image_processor.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
#include "ui/gfx/geometry/size.h"
namespace media {
class V4L2Device;
class H264Parser;
// Helper static methods to be shared between V4L2VideoDecodeAccelerator and
// V4L2SliceVideoDecodeAccelerator. This avoids some code duplication between
// these very similar classes.
// Note: this namespace can be removed once the V4L2VDA is deprecated.
namespace v4l2_vda_helpers {
// Returns a usable input format of image processor, or nullopt if not found.
absl::optional<Fourcc> FindImageProcessorInputFormat(V4L2Device* vda_device);
// Return a usable output format of image processor, or nullopt if not found.
absl::optional<Fourcc> FindImageProcessorOutputFormat(V4L2Device* ip_device);
// Create and return an image processor for the given parameters, or nullptr
// if it cannot be created.
// |vda_output_format| is the output format of the VDA, i.e. the IP's input
// format.
// |ip_output_format| is the output format that the IP must produce.
// |vda_output_coded_size| is the coded size of the VDA output buffers (i.e.
// the input coded size for the IP).
// |ip_output_coded_size| is the coded size of the output buffers that the IP
// must produce.
// |visible_size| is the visible size of both the input and output buffers.
// |output_storage_type| indicates what type of VideoFrame is used for output.
// |nb_buffers| is the exact number of output buffers that the IP must create.
// |image_processor_output_mode| specifies whether the IP must allocate its
// own buffers or rely on imported ones.
// |client_task_runner| is the task runner for interacting with image processor.
// |error_cb| is the error callback passed to
// V4L2ImageProcessorBackend::Create().
std::unique_ptr<ImageProcessor> CreateImageProcessor(
const Fourcc vda_output_format,
const Fourcc ip_output_format,
const gfx::Size& vda_output_coded_size,
const gfx::Size& ip_output_coded_size,
const gfx::Size& visible_size,
VideoFrame::StorageType output_storage_type,
size_t nb_buffers,
scoped_refptr<V4L2Device> image_processor_device,
ImageProcessor::OutputMode image_processor_output_mode,
scoped_refptr<base::SequencedTaskRunner> client_task_runner,
ImageProcessor::ErrorCB error_cb);
// When importing a buffer (ARC++ use-case), the buffer's actual size may
// be different from the requested one. However, the actual size is never
// provided to us - so we need to compute it from the NativePixmapHandle.
// Given the |handle| and |fourcc| of the buffer, adjust |current_size| to
// the actual computed size of the buffer and return the new size.
gfx::Size NativePixmapSizeFromHandle(const gfx::NativePixmapHandle& handle,
const Fourcc fourcc,
const gfx::Size& current_size);
// Interface to split an input stream into chunks containing whole frames.
// This default implementation can be used for codecs that do not support frame
// splitting (like VP8 or VP9), whereas codecs that use slices can inherit
// and specialize it.
class InputBufferFragmentSplitter {
static std::unique_ptr<InputBufferFragmentSplitter> CreateFromProfile(
media::VideoCodecProfile profile);
explicit InputBufferFragmentSplitter() = default;
virtual ~InputBufferFragmentSplitter() = default;
// Advance to the next fragment that begins a frame.
virtual bool AdvanceFrameFragment(const uint8_t* data,
size_t size,
size_t* endpos);
virtual void Reset();
// Returns true if we may currently be in the middle of a frame (e.g. we
// haven't yet parsed all the slices of a multi-slice H.264 frame).
virtual bool IsPartialFramePending() const;
// Splitter for H.264, making sure to properly report when a partial frame
// may be pending.
class H264InputBufferFragmentSplitter : public InputBufferFragmentSplitter {
explicit H264InputBufferFragmentSplitter();
~H264InputBufferFragmentSplitter() override;
bool AdvanceFrameFragment(const uint8_t* data,
size_t size,
size_t* endpos) override;
void Reset() override;
bool IsPartialFramePending() const override;
// For H264 decode, hardware requires that we send it frame-sized chunks.
// We'll need to parse the stream.
std::unique_ptr<H264Parser> h264_parser_;
// Set if we have a pending incomplete frame in the input buffer.
bool partial_frame_pending_ = false;
} // namespace v4l2_vda_helpers
} // namespace media