Migrate content/common/gpu/media code to media/gpu

content/common/gpu/media/v4l2_jpeg_decode_accelerator.h

-// Copyright 2015 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.
-
-#ifndef CONTENT_COMMON_GPU_MEDIA_V4L2_JPEG_DECODE_ACCELERATOR_H_
-#define CONTENT_COMMON_GPU_MEDIA_V4L2_JPEG_DECODE_ACCELERATOR_H_
-
-#include <stddef.h>
-#include <stdint.h>
-
-#include <queue>
-#include <vector>
-
-#include "base/macros.h"
-#include "base/memory/linked_ptr.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/weak_ptr.h"
-#include "base/single_thread_task_runner.h"
-#include "base/threading/thread.h"
-#include "content/common/content_export.h"
-#include "content/common/gpu/media/shared_memory_region.h"
-#include "content/common/gpu/media/v4l2_device.h"
-#include "media/base/bitstream_buffer.h"
-#include "media/base/video_frame.h"
-#include "media/video/jpeg_decode_accelerator.h"
-
-namespace content {
-
-class CONTENT_EXPORT V4L2JpegDecodeAccelerator
-    : public media::JpegDecodeAccelerator {
- public:
-  V4L2JpegDecodeAccelerator(
-      const scoped_refptr<V4L2Device>& device,
-      const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner);
-  ~V4L2JpegDecodeAccelerator() override;
-
-  // media::JpegDecodeAccelerator implementation.
-  bool Initialize(Client* client) override;
-  void Decode(const media::BitstreamBuffer& bitstream_buffer,
-              const scoped_refptr<media::VideoFrame>& video_frame) override;
-  bool IsSupported() override;
-
- private:
-  // Record for input/output buffers.
-  struct BufferRecord {
-    BufferRecord();
-    ~BufferRecord();
-    void* address;          // mmap() address.
-    size_t length;          // mmap() length.
-
-    // Set true during QBUF and DQBUF. |address| will be accessed by hardware.
-    bool at_device;
-  };
-
-  // Job record. Jobs are processed in a FIFO order. This is separate from
-  // BufferRecord of input, because a BufferRecord of input may be returned
-  // before we dequeue the corresponding output buffer. It can't always be
-  // associated with a BufferRecord of output immediately either, because at
-  // the time of submission we may not have one available (and don't need one
-  // to submit input to the device).
-  struct JobRecord {
-    JobRecord(const media::BitstreamBuffer& bitstream_buffer,
-              scoped_refptr<media::VideoFrame> video_frame);
-    ~JobRecord();
-
-    // Input image buffer ID.
-    int32_t bitstream_buffer_id;
-    // Memory mapped from |bitstream_buffer|.
-    SharedMemoryRegion shm;
-    // Output frame buffer.
-    scoped_refptr<media::VideoFrame> out_frame;
-  };
-
-  void EnqueueInput();
-  void EnqueueOutput();
-  void Dequeue();
-  bool EnqueueInputRecord();
-  bool EnqueueOutputRecord();
-  bool CreateInputBuffers();
-  bool CreateOutputBuffers();
-  void DestroyInputBuffers();
-  void DestroyOutputBuffers();
-
-  // Return the number of input/output buffers enqueued to the device.
-  size_t InputBufferQueuedCount();
-  size_t OutputBufferQueuedCount();
-
-  // Return true if input buffer size is not enough.
-  bool ShouldRecreateInputBuffers();
-  // Destroy and create input buffers. Return false on error.
-  bool RecreateInputBuffers();
-  // Destroy and create output buffers. Return false on error.
-  bool RecreateOutputBuffers();
-
-  void VideoFrameReady(int32_t bitstream_buffer_id);
-  void NotifyError(int32_t bitstream_buffer_id, Error error);
-  void PostNotifyError(int32_t bitstream_buffer_id, Error error);
-
-  // Run on |decoder_thread_| to enqueue the coming frame.
-  void DecodeTask(std::unique_ptr<JobRecord> job_record);
-
-  // Run on |decoder_thread_| to dequeue last frame and enqueue next frame.
-  // This task is triggered by DevicePollTask. |event_pending| means that device
-  // has resolution change event or pixelformat change event.
-  void ServiceDeviceTask(bool event_pending);
-
-  // Dequeue source change event. Return false on error.
-  bool DequeueSourceChangeEvent();
-
-  // Start/Stop |device_poll_thread_|.
-  void StartDevicePoll();
-  bool StopDevicePoll();
-
-  // Run on |device_poll_thread_| to wait for device events.
-  void DevicePollTask();
-
-  // Run on |decoder_thread_| to destroy input and output buffers.
-  void DestroyTask();
-
-  // The number of input buffers and output buffers.
-  const size_t kBufferCount = 2;
-
-  // Coded size of output buffer.
-  gfx::Size output_buffer_coded_size_;
-
-  // Pixel format of output buffer.
-  uint32_t output_buffer_pixelformat_;
-
-  // ChildThread's task runner.
-  scoped_refptr<base::SingleThreadTaskRunner> child_task_runner_;
-
-  // GPU IO task runner.
-  scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
-
-  // The client of this class.
-  Client* client_;
-
-  // The V4L2Device this class is operating upon.
-  scoped_refptr<V4L2Device> device_;
-
-  // Thread to communicate with the device.
-  base::Thread decoder_thread_;
-  // Decode task runner.
-  scoped_refptr<base::SingleThreadTaskRunner> decoder_task_runner_;
-  // Thread used to poll the V4L2 for events only.
-  base::Thread device_poll_thread_;
-  // Device poll task runner.
-  scoped_refptr<base::SingleThreadTaskRunner> device_poll_task_runner_;
-
-  // All the below members except |weak_factory_| are accessed from
-  // |decoder_thread_| only (if it's running).
-  std::queue<linked_ptr<JobRecord>> input_jobs_;
-  std::queue<linked_ptr<JobRecord>> running_jobs_;
-
-  // Input queue state.
-  bool input_streamon_;
-  // Mapping of int index to an input buffer record.
-  std::vector<BufferRecord> input_buffer_map_;
-  // Indices of input buffers ready to use; LIFO since we don't care about
-  // ordering.
-  std::vector<int> free_input_buffers_;
-
-  // Output queue state.
-  bool output_streamon_;
-  // Mapping of int index to an output buffer record.
-  std::vector<BufferRecord> output_buffer_map_;
-  // Indices of output buffers ready to use; LIFO since we don't care about
-  // ordering.
-  std::vector<int> free_output_buffers_;
-
-  // Weak factory for producing weak pointers on the child thread.
-  base::WeakPtrFactory<V4L2JpegDecodeAccelerator> weak_factory_;
-  // Point to |this| for use in posting tasks from the decoder thread back to
-  // the ChildThread.
-  base::WeakPtr<V4L2JpegDecodeAccelerator> weak_ptr_;
-
-  DISALLOW_COPY_AND_ASSIGN(V4L2JpegDecodeAccelerator);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_COMMON_GPU_MEDIA_V4L2_JPEG_DECODE_ACCELERATOR_H_