Revert 137988 - VAVDA is the hardware video decode accelerator for Chrome on Linux and ChromeOS for…

content/common/gpu/media/vaapi_video_decode_accelerator.h

-// Copyright (c) 2012 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.
-//
-// This file contains an implementation of VideoDecoderAccelerator
-// that utilizes hardware video decoder present on Intel CPUs.
-
-#ifndef CONTENT_COMMON_GPU_MEDIA_VAAPI_VIDEO_DECODE_ACCELERATOR_H_
-#define CONTENT_COMMON_GPU_MEDIA_VAAPI_VIDEO_DECODE_ACCELERATOR_H_
-
-#include <GL/glx.h>
-
-#include <queue>
-#include <utility>
-#include <vector>
-
-#include "base/logging.h"
-#include "base/memory/ref_counted.h"
-#include "base/message_loop.h"
-#include "base/shared_memory.h"
-#include "base/synchronization/condition_variable.h"
-#include "base/synchronization/lock.h"
-#include "base/threading/non_thread_safe.h"
-#include "base/threading/thread.h"
-#include "content/common/gpu/media/vaapi_h264_decoder.h"
-#include "media/base/bitstream_buffer.h"
-#include "media/video/picture.h"
-#include "media/video/video_decode_accelerator.h"
-
-// Class to provide video decode acceleration for Intel systems with hardware
-// support for it, and on which libva is available.
-// Decoding tasks are performed in a separate decoding thread.
-class VaapiVideoDecodeAccelerator : public media::VideoDecodeAccelerator {
- public:
-  VaapiVideoDecodeAccelerator(Client* client);
-
-  // media::VideoDecodeAccelerator implementation.
-  virtual bool Initialize(media::VideoCodecProfile profile) OVERRIDE;
-  virtual void Decode(const media::BitstreamBuffer& bitstream_buffer) OVERRIDE;
-  virtual void AssignPictureBuffers(
-      const std::vector<media::PictureBuffer>& buffers) OVERRIDE;
-  virtual void ReusePictureBuffer(int32 picture_buffer_id) OVERRIDE;
-  virtual void Flush() OVERRIDE;
-  virtual void Reset() OVERRIDE;
-  virtual void Destroy() OVERRIDE;
-
-  // Used by user of this class to pass X/GLX state.
-  void SetGlxState(Display* x_display, GLXContext glx_context);
-
- private:
-  virtual ~VaapiVideoDecodeAccelerator();
-
-  void NotifyInitializeDone();
-
-  // Notify the client that the input buffer has been consumed.
-  void NotifyInputBufferRead(int input_buffer_id);
-
-  // Ensure data has been synced with the output texture and notify
-  // the client it is ready for displaying.
-  void SyncAndNotifyPictureReady(int32 input_id, int32 output_id);
-
-  // Posted by the decoder thread to notify VAVDA that the decoder has
-  // initially parsed the stream and is ready to decode. If the pictures have
-  // not yet been requested, it will request the client to provide |num_pics|
-  // textures of given |size| and wait for them, otherwise will post
-  // a DecodeTask directly.
-  void ReadyToDecode(int num_pics, const gfx::Size& size);
-
-  // Notify the client that an error has occurred and decoding cannot continue.
-  void NotifyError(Error error);
-
-  // Map the received input buffer into this process' address space and
-  // queue it for decode.
-  void MapAndQueueNewInputBuffer(
-      const media::BitstreamBuffer& bitstream_buffer);
-
-  // Get a new input buffer from the queue and set it up in decoder. This will
-  // sleep if no input buffers are available. Return true if a new buffer has
-  // been set up, false if an early exit has been requested (due to initiated
-  // reset/flush/destroy).
-  bool GetInputBuffer();
-
-  // Signal the client that the current buffer has been read and can be
-  // returned. Will also release the mapping.
-  void ReturnCurrInputBuffer();
-
-  // Get and set up one or more output buffers in the decoder. This will sleep
-  // if no buffers are available. Return true if buffers have been set up or
-  // false if an early exit has been requested (due to initiated
-  // reset/flush/destroy).
-  bool GetOutputBuffers();
-
-  // Initial decode task: get the decoder to the point in the stream from which
-  // it can start/continue decoding. Does not require output buffers and does
-  // not produce output frames. Called either when starting with a new stream
-  // or when playback is to be resumed following a seek.
-  void InitialDecodeTask();
-
-  // Decoding task. Will continue decoding given input buffers and sleep
-  // waiting for input/output as needed. Will exit if a reset/flush/destroy
-  // is requested.
-  void DecodeTask();
-
-  // Scheduled after receiving a flush request and executed after the current
-  // decoding task finishes decoding pending inputs. Makes the decoder return
-  // all remaining output pictures and puts it in an idle state, ready
-  // to resume if needed and schedules a FinishFlush.
-  void FlushTask();
-
-  // Scheduled by the FlushTask after decoder is flushed to put VAVDA into idle
-  // state and notify the client that flushing has been finished.
-  void FinishFlush();
-
-  // Scheduled after receiving a reset request and executed after the current
-  // decoding task finishes decoding the current frame. Puts the decoder into
-  // an idle state, ready to resume if needed, discarding decoded but not yet
-  // outputted pictures (decoder keeps ownership of their associated picture
-  // buffers). Schedules a FinishReset afterwards.
-  void ResetTask();
-
-  // Scheduled by ResetTask after it's done putting VAVDA into an idle state.
-  // Drops remaining input buffers and notifies the client that reset has been
-  // finished.
-  void FinishReset();
-
-  // Scheduled on the decoder thread after receiving a Destroy() call from the
-  // client, executed after the current decoding task finishes decoding the
-  // current frame, ignoring any remaining inputs. Cleans up the decoder and
-  // frees all resources.
-  void DestroyTask();
-
-  // Scheduled by DestroyTask after it's done destroying the decoder, puts
-  // VAVDA into an uninitialized state.
-  void FinishDestroy();
-
-  // Client-provided X/GLX state.
-  Display* x_display_;
-  GLXContext glx_context_;
-
-  // VAVDA state.
-  enum State {
-    // Initialize() not called yet or failed.
-    kUninitialized,
-    // Initialize() succeeded, no initial decode and no pictures requested.
-    kInitialized,
-    // Initial decode finished, requested pictures and waiting for them.
-    kPicturesRequested,
-    // Everything initialized, pictures received and assigned, in decoding.
-    kDecoding,
-    // Resetting, waiting for decoder to finish current task and cleanup.
-    kResetting,
-    // Flushing, waiting for decoder to finish current task and cleanup.
-    kFlushing,
-    // Idle, decoder in state ready to resume decoding.
-    kIdle,
-    // Destroying, waiting for the decoder to finish current task.
-    kDestroying,
-  };
-
-  State state_;
-
-  // Protects input and output buffer queues and state_.
-  base::Lock lock_;
-
-  // An input buffer awaiting consumption, provided by the client.
-  struct InputBuffer {
-    InputBuffer();
-    ~InputBuffer();
-
-    int32 id;
-    size_t size;
-    scoped_ptr<base::SharedMemory> shm;
-  };
-
-  // Queue for incoming input buffers.
-  typedef std::queue<linked_ptr<InputBuffer> > InputBuffers;
-  InputBuffers input_buffers_;
-  // Signalled when input buffers are queued onto the input_buffers_ queue.
-  base::ConditionVariable input_ready_;
-
-  // Current input buffer at decoder.
-  linked_ptr<InputBuffer> curr_input_buffer_;
-
-  // Queue for incoming input buffers.
-  typedef std::queue<int32> OutputBuffers;
-  OutputBuffers output_buffers_;
-  // Signalled when output buffers are queued onto the output_buffers_ queue.
-  base::ConditionVariable output_ready_;
-
-  // ChildThread's message loop
-  MessageLoop* message_loop_;
-
-  // To expose client callbacks from VideoDecodeAccelerator.
-  // NOTE: all calls to this object *MUST* be executed on message_loop_.
-  Client* client_;
-
-  base::Thread decoder_thread_;
-  content::VaapiH264Decoder decoder_;
-
-  // Callback passed to the decoder, which it will use to signal readiness
-  // of an output picture to be displayed.
-  void OutputPicCallback(int32 input_id, int32 output_id);
-
-  DISALLOW_COPY_AND_ASSIGN(VaapiVideoDecodeAccelerator);
-};
-
-#endif  // CONTENT_COMMON_GPU_MEDIA_VAAPI_VIDEO_DECODE_ACCELERATOR_H_
-