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// Copyright 2014 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_VIDEO_ENCODE_ACCELERATOR_H_
#define CONTENT_COMMON_GPU_MEDIA_V4L2_VIDEO_ENCODE_ACCELERATOR_H_
#include <list>
#include <linux/videodev2.h>
#include <vector>
#include "base/memory/linked_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/threading/thread.h"
#include "content/common/content_export.h"
#include "content/common/gpu/media/v4l2_image_processor.h"
#include "content/common/gpu/media/v4l2_video_device.h"
#include "media/video/video_encode_accelerator.h"
#include "ui/gfx/size.h"
namespace base {
class MessageLoopProxy;
} // namespace base
namespace media {
class BitstreamBuffer;
} // namespace media
namespace content {
// This class handles video encode acceleration by interfacing with a V4L2
// device exposed by the codec hardware driver. The threading model of this
// class is the same as in the V4L2VideoDecodeAccelerator (from which class this
// was designed).
// This class may try to instantiate and use a V4L2ImageProcessor for input
// format conversion, if the input format requested via Initialize() is not
// accepted by the hardware codec.
class CONTENT_EXPORT V4L2VideoEncodeAccelerator
: public media::VideoEncodeAccelerator {
public:
explicit V4L2VideoEncodeAccelerator(scoped_ptr<V4L2Device> device);
virtual ~V4L2VideoEncodeAccelerator();
// media::VideoEncodeAccelerator implementation.
virtual bool Initialize(media::VideoFrame::Format format,
const gfx::Size& input_visible_size,
media::VideoCodecProfile output_profile,
uint32 initial_bitrate,
Client* client) OVERRIDE;
virtual void Encode(const scoped_refptr<media::VideoFrame>& frame,
bool force_keyframe) OVERRIDE;
virtual void UseOutputBitstreamBuffer(const media::BitstreamBuffer& buffer)
OVERRIDE;
virtual void RequestEncodingParametersChange(uint32 bitrate,
uint32 framerate) OVERRIDE;
virtual void Destroy() OVERRIDE;
static std::vector<media::VideoEncodeAccelerator::SupportedProfile>
GetSupportedProfiles();
private:
// Auto-destroy reference for BitstreamBuffer, for tracking buffers passed to
// this instance.
struct BitstreamBufferRef;
// Record for codec input buffers.
struct InputRecord {
InputRecord();
bool at_device;
scoped_refptr<media::VideoFrame> frame;
};
// Record for output buffers.
struct OutputRecord {
OutputRecord();
bool at_device;
linked_ptr<BitstreamBufferRef> buffer_ref;
void* address;
size_t length;
};
enum {
kInitialFramerate = 30,
// These are rather subjectively tuned.
kInputBufferCount = 2,
kOutputBufferCount = 2,
kOutputBufferSize = (2 * 1024 * 1024),
};
// Internal state of the encoder.
enum State {
kUninitialized, // Initialize() not yet called.
kInitialized, // Initialize() returned true; ready to start encoding.
kEncoding, // Encoding frames.
kError, // Error in encoder state.
};
//
// Callbacks for the image processor, if one is used.
//
// Callback run by the image processor when a frame is ready for us to encode.
void FrameProcessed(bool force_keyframe,
const scoped_refptr<media::VideoFrame>& frame);
// Error callback for handling image processor errors.
void ImageProcessorError();
//
// Encoding tasks, to be run on encode_thread_.
//
void EncodeTask(const scoped_refptr<media::VideoFrame>& frame,
bool force_keyframe);
// Add a BitstreamBuffer to the queue of buffers ready to be used for encoder
// output.
void UseOutputBitstreamBufferTask(scoped_ptr<BitstreamBufferRef> buffer_ref);
// Device destruction task.
void DestroyTask();
// Service I/O on the V4L2 devices. This task should only be scheduled from
// DevicePollTask().
void ServiceDeviceTask();
// Handle the device queues.
void Enqueue();
void Dequeue();
// Enqueue a buffer on the corresponding queue. Returns false on fatal error.
bool EnqueueInputRecord();
bool EnqueueOutputRecord();
// Attempt to start/stop device_poll_thread_.
bool StartDevicePoll();
bool StopDevicePoll();
//
// Device tasks, to be run on device_poll_thread_.
//
// The device task.
void DevicePollTask(bool poll_device);
//
// Safe from any thread.
//
// Error notification (using PostTask() to child thread, if necessary).
void NotifyError(Error error);
// Set the encoder_thread_ state (using PostTask to encoder thread, if
// necessary).
void SetEncoderState(State state);
//
// Other utility functions. Called on encoder_thread_, unless
// encoder_thread_ is not yet started, in which case the child thread can call
// these (e.g. in Initialize() or Destroy()).
//
// Change encoding parameters.
void RequestEncodingParametersChangeTask(uint32 bitrate, uint32 framerate);
// Set up formats and initialize the device for them.
bool SetFormats(media::VideoFrame::Format input_format,
media::VideoCodecProfile output_profile);
// Try to set up the device to the input format we were Initialized() with,
// or if the device doesn't support it, use one it can support, so that we
// can later instantiate a V4L2ImageProcessor to convert to it.
bool NegotiateInputFormat(media::VideoFrame::Format input_format);
// Set up the device to the output format requested in Initialize().
bool SetOutputFormat(media::VideoCodecProfile output_profile);
// Initialize device controls with default values.
bool InitControls();
// Create the buffers we need.
bool CreateInputBuffers();
bool CreateOutputBuffers();
// Destroy these buffers.
void DestroyInputBuffers();
void DestroyOutputBuffers();
// Our original calling message loop for the child thread.
const scoped_refptr<base::MessageLoopProxy> child_message_loop_proxy_;
// WeakPtr<> pointing to |this| for use in posting tasks from the encoder or
// device worker threads back to the child thread. Because the worker threads
// are members of this class, any task running on those threads is guaranteed
// that this object is still alive. As a result, tasks posted from the child
// thread to the encoder or device thread should use base::Unretained(this),
// and tasks posted the other way should use |weak_this_|.
base::WeakPtrFactory<V4L2VideoEncodeAccelerator> weak_this_ptr_factory_;
base::WeakPtr<V4L2VideoEncodeAccelerator> weak_this_;
// To expose client callbacks from VideoEncodeAccelerator.
// NOTE: all calls to these objects *MUST* be executed on
// child_message_loop_proxy_.
scoped_ptr<base::WeakPtrFactory<Client> > client_ptr_factory_;
base::WeakPtr<Client> client_;
gfx::Size visible_size_;
// Input allocated size required by the device.
gfx::Size input_allocated_size_;
size_t output_buffer_byte_size_;
// Formats for input frames and the output stream.
media::VideoFrame::Format device_input_format_;
size_t input_planes_count_;
uint32 output_format_fourcc_;
//
// Encoder state, owned and operated by encoder_thread_.
// Before encoder_thread_ has started, the encoder state is managed by
// the child (main) thread. After encoder_thread_ has started, the encoder
// thread should be the only one managing these.
//
// This thread services tasks posted from the VEA API entry points by the
// child thread and device service callbacks posted from the device thread.
base::Thread encoder_thread_;
// Encoder state.
State encoder_state_;
// We need to provide the stream header with every keyframe, to allow
// midstream decoding restarts. Store it here.
scoped_ptr<uint8[]> stream_header_;
size_t stream_header_size_;
// Video frames ready to be encoded.
std::list<scoped_refptr<media::VideoFrame> > encoder_input_queue_;
// Encoder device.
scoped_ptr<V4L2Device> device_;
// Input queue state.
bool input_streamon_;
// Input buffers enqueued to device.
int input_buffer_queued_count_;
// Input buffers ready to use; LIFO since we don't care about ordering.
std::vector<int> free_input_buffers_;
// Mapping of int index to input buffer record.
std::vector<InputRecord> input_buffer_map_;
enum v4l2_memory input_memory_type_;
// Output queue state.
bool output_streamon_;
// Output buffers enqueued to device.
int output_buffer_queued_count_;
// Output buffers ready to use; LIFO since we don't care about ordering.
std::vector<int> free_output_buffers_;
// Mapping of int index to output buffer record.
std::vector<OutputRecord> output_buffer_map_;
// Bitstream buffers ready to be used to return encoded output, as a LIFO
// since we don't care about ordering.
std::vector<linked_ptr<BitstreamBufferRef> > encoder_output_queue_;
//
// The device polling thread handles notifications of V4L2 device changes.
// TODO(sheu): replace this thread with an TYPE_IO encoder_thread_.
//
// The thread.
base::Thread device_poll_thread_;
// Image processor, if one is in use.
scoped_ptr<V4L2ImageProcessor> image_processor_;
DISALLOW_COPY_AND_ASSIGN(V4L2VideoEncodeAccelerator);
};
} // namespace content
#endif // CONTENT_COMMON_GPU_MEDIA_V4L2_VIDEO_ENCODE_ACCELERATOR_H_