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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.
#include <vector>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/sequence_checker.h"
#include "media/gpu/v4l2/v4l2_device.h"
#include "ui/gfx/geometry/rect.h"
struct v4l2_ext_controls;
struct v4l2_buffer;
namespace media {
// A V4L2-specific decode surface generated by V4L2DecodeSurfaceHandler.
// It is used to store common picture metadata (e.g. visible_rect) and
// platform-specific metadata (e.g. {input,output}_record). All the methods
// should be called on the same sequence.
class V4L2DecodeSurface : public base::RefCounted<V4L2DecodeSurface> {
// V4L2DecodeSurfaceHandler maintains a list of InputRecords, which records
// the status and metadata of input buffers.
// |input_buffer| and |output_buffer| are the buffers to be used as input and
// output in this transaction.
// |frame| is optional, and allows the caller to keep a reference to a
// VideoFrame for as long as this decode surface exists.
V4L2DecodeSurface(V4L2WritableBufferRef input_buffer,
V4L2WritableBufferRef output_buffer,
scoped_refptr<VideoFrame> frame);
// Mark the surface as decoded. This will also release all surfaces used for
// reference, as they are not needed anymore and execute the done callback,
// if not null.
void SetDecoded();
void SetVisibleRect(const gfx::Rect& visible_rect);
// Take references to each reference surface and keep them until the
// target surface is decoded.
void SetReferenceSurfaces(
std::vector<scoped_refptr<V4L2DecodeSurface>> ref_surfaces);
// If provided via this method, |done_cb| callback will be executed after
// decoding into this surface is finished. The callback is reset afterwards,
// so it needs to be set again before each decode operation.
void SetDecodeDoneCallback(base::OnceClosure done_cb);
// Set the callback that will be called when the surface is released. This
// method must be called one time at most.
void SetReleaseCallback(base::OnceClosure release_cb);
// Update the passed v4l2_ext_controls structure to add the request or
// config store information.
virtual void PrepareSetCtrls(struct v4l2_ext_controls* ctrls) const = 0;
// Return the ID to use in order to reference this frame.
virtual uint64_t GetReferenceID() const = 0;
// Set controls, queue buffers and submit the request corresponding to this
// surface.
virtual bool Submit() = 0;
bool decoded() const { return decoded_; }
int input_record() const { return input_record_; }
V4L2WritableBufferRef& input_buffer() {
return input_buffer_;
int output_record() const { return output_record_; }
V4L2WritableBufferRef& output_buffer() {
return output_buffer_;
scoped_refptr<VideoFrame> video_frame() const { return video_frame_; }
gfx::Rect visible_rect() const { return visible_rect_; }
std::string ToString() const;
virtual ~V4L2DecodeSurface();
friend class base::RefCounted<V4L2DecodeSurface>;
V4L2WritableBufferRef input_buffer_;
V4L2WritableBufferRef output_buffer_;
scoped_refptr<VideoFrame> video_frame_;
// The index of the corresponding input record.
const int input_record_;
// The index of the corresponding output record.
const int output_record_;
// The visible size of the buffer.
gfx::Rect visible_rect_;
// Indicate whether the surface is decoded or not.
bool decoded_;
// Callback function which is called when the instance is destroyed.
base::OnceClosure release_cb_;
// Callback function which is called after the surface has been decoded.
base::OnceClosure done_cb_;
// The decoded surfaces of the reference frames, which is kept until the
// surface has been decoded.
std::vector<scoped_refptr<V4L2DecodeSurface>> reference_surfaces_;
// An implementation of V4L2DecodeSurface that uses the config store to
// associate controls/buffers to frames.
class V4L2ConfigStoreDecodeSurface : public V4L2DecodeSurface {
V4L2ConfigStoreDecodeSurface(V4L2WritableBufferRef input_buffer,
V4L2WritableBufferRef output_buffer,
scoped_refptr<VideoFrame> frame)
: V4L2DecodeSurface(std::move(input_buffer),
// config store IDs are arbitrarily defined to be buffer ID + 1
config_store_(this->input_buffer().BufferId() + 1) {}
void PrepareSetCtrls(struct v4l2_ext_controls* ctrls) const override;
uint64_t GetReferenceID() const override;
bool Submit() override;
~V4L2ConfigStoreDecodeSurface() override = default;
// The configuration store of the input buffer.
uint32_t config_store_;
// An implementation of V4L2DecodeSurface that uses requests to associate
// controls/buffers to frames
class V4L2RequestDecodeSurface : public V4L2DecodeSurface {
V4L2RequestDecodeSurface(V4L2WritableBufferRef input_buffer,
V4L2WritableBufferRef output_buffer,
scoped_refptr<VideoFrame> frame,
V4L2RequestRef request_ref)
: V4L2DecodeSurface(std::move(input_buffer),
request_ref_(std::move(request_ref)) {}
void PrepareSetCtrls(struct v4l2_ext_controls* ctrls) const override;
uint64_t GetReferenceID() const override;
bool Submit() override;
~V4L2RequestDecodeSurface() override = default;
// Request reference used for the surface.
V4L2RequestRef request_ref_;
} // namespace media