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// Copyright 2016 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 <mfapi.h>
#include <mfidl.h>
#include <stdint.h>
#include <strmif.h>
#include <wrl/client.h>
#include <memory>
#include "base/bind.h"
#include "base/containers/circular_deque.h"
#include "base/memory/weak_ptr.h"
#include "base/single_thread_task_runner.h"
#include "base/threading/thread.h"
#include "media/gpu/media_gpu_export.h"
#include "media/video/video_encode_accelerator.h"
namespace media {
// Media Foundation implementation of the VideoEncodeAccelerator interface for
// Windows.
// This class saves the task runner on which it is constructed and runs client
// callbacks using that same task runner.
// This class has DCHECKs to makes sure that methods are called in the
// correct task runners. It starts an internal encoder thread on which
// VideoEncodeAccelerator implementation tasks are posted.
class MEDIA_GPU_EXPORT MediaFoundationVideoEncodeAccelerator
: public VideoEncodeAccelerator {
// If |compatible_with_win7| is true, MediaFoundationVideoEncoderAccelerator
// works on Windows 7. Some attributes of the encoder are not supported on old
// systems, which may impact the performance or quality of the output.
explicit MediaFoundationVideoEncodeAccelerator(bool compatible_with_win7);
// VideoEncodeAccelerator implementation.
VideoEncodeAccelerator::SupportedProfiles GetSupportedProfiles() override;
bool Initialize(const Config& config, Client* client) override;
void Encode(const scoped_refptr<VideoFrame>& frame,
bool force_keyframe) override;
void UseOutputBitstreamBuffer(const BitstreamBuffer& buffer) override;
void RequestEncodingParametersChange(uint32_t bitrate,
uint32_t framerate) override;
void Destroy() override;
// Preload dlls required for encoding. Returns true if all required dlls are
// correctly loaded.
static bool PreSandboxInitialization();
~MediaFoundationVideoEncodeAccelerator() override;
// Holds output buffers coming from the client ready to be filled.
struct BitstreamBufferRef;
// Holds output buffers coming from the encoder.
class EncodeOutput;
// Creates an hardware encoder backed IMFTransform instance on |encoder_|.
bool CreateHardwareEncoderMFT();
// Initializes and allocates memory for input and output samples.
bool InitializeInputOutputSamples(VideoCodecProfile output_profile);
// Initializes encoder parameters for real-time use.
bool SetEncoderModes();
// Returns true if we can initialize input and output samples with the given
// frame size, otherwise false.
bool IsResolutionSupported(const gfx::Size& size);
// Helper function to notify the client of an error on
// |main_client_task_runner_|.
void NotifyError(VideoEncodeAccelerator::Error error);
// Encoding tasks to be run on |encoder_thread_|.
void EncodeTask(scoped_refptr<VideoFrame> frame, bool force_keyframe);
// Checks for and copies encoded output on |encoder_thread_|.
void ProcessOutput();
// Inserts the output buffers for reuse on |encoder_thread_|.
void UseOutputBitstreamBufferTask(
std::unique_ptr<BitstreamBufferRef> buffer_ref);
// Copies EncodeOutput into a BitstreamBuffer and returns it to the
// |main_client_|.
void ReturnBitstreamBuffer(
std::unique_ptr<EncodeOutput> encode_output,
// Changes encode parameters on |encoder_thread_|.
void RequestEncodingParametersChangeTask(uint32_t bitrate,
uint32_t framerate);
// Destroys encode session on |encoder_thread_|.
void DestroyTask();
// Releases resources encoder holds.
void ReleaseEncoderResources();
const bool compatible_with_win7_;
// Bitstream buffers ready to be used to return encoded output as a FIFO.
// EncodeOutput needs to be copied into a BitstreamBufferRef as a FIFO.
base::circular_deque<std::unique_ptr<EncodeOutput>> encoder_output_queue_;
gfx::Size input_visible_size_;
size_t bitstream_buffer_size_;
uint32_t frame_rate_;
uint32_t target_bitrate_;
size_t u_plane_offset_;
size_t v_plane_offset_;
size_t y_stride_;
size_t u_stride_;
size_t v_stride_;
Microsoft::WRL::ComPtr<IMFTransform> encoder_;
Microsoft::WRL::ComPtr<ICodecAPI> codec_api_;
DWORD input_stream_id_;
DWORD output_stream_id_;
Microsoft::WRL::ComPtr<IMFMediaType> imf_input_media_type_;
Microsoft::WRL::ComPtr<IMFMediaType> imf_output_media_type_;
Microsoft::WRL::ComPtr<IMFSample> input_sample_;
Microsoft::WRL::ComPtr<IMFSample> output_sample_;
// To expose client callbacks from VideoEncodeAccelerator.
// NOTE: all calls to this object *MUST* be executed on
// |main_client_task_runner_|.
base::WeakPtr<Client> main_client_;
std::unique_ptr<base::WeakPtrFactory<Client>> main_client_weak_factory_;
scoped_refptr<base::SingleThreadTaskRunner> main_client_task_runner_;
// This thread services tasks posted from the VEA API entry points by the
// GPU child thread and CompressionCallback() posted from device thread.
base::Thread encoder_thread_;
scoped_refptr<base::SingleThreadTaskRunner> encoder_thread_task_runner_;
// Declared last to ensure that all weak pointers are invalidated before
// other destructors run.
} // namespace media