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// 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 MEDIA_GPU_V4L2_V4L2_SLICE_VIDEO_DECODE_ACCELERATOR_H_
#define MEDIA_GPU_V4L2_V4L2_SLICE_VIDEO_DECODE_ACCELERATOR_H_
#include <linux/videodev2.h>
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include <utility>
#include <vector>
#include "base/containers/queue.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/synchronization/waitable_event.h"
#include "base/threading/thread.h"
#include "media/gpu/decode_surface_handler.h"
#include "media/gpu/gpu_video_decode_accelerator_helpers.h"
#include "media/gpu/h264_decoder.h"
#include "media/gpu/media_gpu_export.h"
#include "media/gpu/v4l2/v4l2_device.h"
#include "media/gpu/vp8_decoder.h"
#include "media/gpu/vp9_decoder.h"
#include "media/video/video_decode_accelerator.h"
#include "ui/gl/gl_fence_egl.h"
namespace media {
class V4L2DecodeSurface;
// An implementation of VideoDecodeAccelerator that utilizes the V4L2 slice
// level codec API for decoding. The slice level API provides only a low-level
// decoding functionality and requires userspace to provide support for parsing
// the input stream and managing decoder state across frames.
class MEDIA_GPU_EXPORT V4L2SliceVideoDecodeAccelerator
: public VideoDecodeAccelerator,
public DecodeSurfaceHandler<V4L2DecodeSurface> {
public:
V4L2SliceVideoDecodeAccelerator(
const scoped_refptr<V4L2Device>& device,
EGLDisplay egl_display,
const BindGLImageCallback& bind_image_cb,
const MakeGLContextCurrentCallback& make_context_current_cb);
~V4L2SliceVideoDecodeAccelerator() override;
// VideoDecodeAccelerator implementation.
bool Initialize(const Config& config, Client* client) override;
void Decode(const BitstreamBuffer& bitstream_buffer) override;
void Decode(scoped_refptr<DecoderBuffer> buffer,
int32_t bitstream_id) override;
void AssignPictureBuffers(const std::vector<PictureBuffer>& buffers) override;
void ImportBufferForPicture(
int32_t picture_buffer_id,
VideoPixelFormat pixel_format,
const gfx::GpuMemoryBufferHandle& gpu_memory_buffer_handle) override;
void ReusePictureBuffer(int32_t picture_buffer_id) override;
void Flush() override;
void Reset() override;
void Destroy() override;
bool TryToSetupDecodeOnSeparateThread(
const base::WeakPtr<Client>& decode_client,
const scoped_refptr<base::SingleThreadTaskRunner>& decode_task_runner)
override;
static VideoDecodeAccelerator::SupportedProfiles GetSupportedProfiles();
private:
class V4L2H264Accelerator;
class V4L2VP8Accelerator;
class V4L2VP9Accelerator;
// Record for input buffers.
struct InputRecord {
InputRecord();
int32_t input_id;
void* address;
size_t length;
size_t bytes_used;
bool at_device;
};
// Record for output buffers.
struct OutputRecord {
OutputRecord();
OutputRecord(OutputRecord&&);
~OutputRecord();
bool at_device;
bool at_client;
size_t num_times_sent_to_client;
int32_t picture_id;
GLuint client_texture_id;
GLuint texture_id;
std::unique_ptr<gl::GLFenceEGL> egl_fence;
std::vector<base::ScopedFD> dmabuf_fds;
bool cleared;
};
// Decoder state enum.
enum State {
// We are in this state until Initialize() returns successfully.
// We can't post errors to the client in this state yet.
kUninitialized,
// Initialize() returned successfully.
kInitialized,
// This state allows making progress decoding more input stream.
kDecoding,
// Transitional state when we are not decoding any more stream, but are
// performing flush, reset, resolution change or are destroying ourselves.
kIdle,
// Requested new PictureBuffers via ProvidePictureBuffers(), awaiting
// AssignPictureBuffers().
kAwaitingPictureBuffers,
// Error state, set when sending NotifyError to client.
kError,
// Destroying state, when shutting down the decoder.
kDestroying,
};
// See http://crbug.com/255116.
// Input bitstream buffer size for up to 1080p streams.
const size_t kInputBufferMaxSizeFor1080p = 1024 * 1024;
// Input bitstream buffer size for up to 4k streams.
const size_t kInputBufferMaxSizeFor4k = 4 * kInputBufferMaxSizeFor1080p;
const size_t kNumInputBuffers = 16;
// Input format V4L2 fourccs this class supports.
static const uint32_t supported_input_fourccs_[];
//
// Below methods are used by accelerator implementations.
//
// DecodeSurfaceHandler implementation.
scoped_refptr<V4L2DecodeSurface> CreateSurface() override;
// SurfaceReady() uses |decoder_display_queue_| to guarantee that decoding
// of |dec_surface| happens in order.
void SurfaceReady(const scoped_refptr<V4L2DecodeSurface>& dec_surface,
int32_t bitstream_id,
const gfx::Rect& visible_rect,
const VideoColorSpace& /* color_space */) override;
// Append slice data in |data| of size |size| to pending hardware
// input buffer with |index|. This buffer will be submitted for decode
// on the next DecodeSurface(). Return true on success.
bool SubmitSlice(int index, const uint8_t* data, size_t size);
// Submit controls in |ext_ctrls| to hardware. Return true on success.
bool SubmitExtControls(struct v4l2_ext_controls* ext_ctrls);
// Gets current control values for controls in |ext_ctrls| from the driver.
// Return true on success.
bool GetExtControls(struct v4l2_ext_controls* ext_ctrls);
// Return true if the driver exposes V4L2 control |ctrl_id|, false otherwise.
bool IsCtrlExposed(uint32_t ctrl_id);
//
// Internal methods of this class.
//
// Recycle a V4L2 input buffer with |index| after dequeuing from device.
void ReuseInputBuffer(int index);
// Recycle V4L2 output buffer with |index|. Used as surface release callback.
void ReuseOutputBuffer(int index);
// Queue a |dec_surface| to device for decoding.
void Enqueue(const scoped_refptr<V4L2DecodeSurface>& dec_surface);
// Dequeue any V4L2 buffers available and process.
void Dequeue();
// V4L2 QBUF helpers.
bool EnqueueInputRecord(int index, uint32_t config_store);
bool EnqueueOutputRecord(int index);
// Set input and output formats in hardware.
bool SetupFormats();
// Create input and output buffers.
bool CreateInputBuffers();
bool CreateOutputBuffers();
// Destroy input buffers.
void DestroyInputBuffers();
// Destroy output buffers and release associated resources (textures,
// EGLImages). If |dismiss| is true, also dismissing the associated
// PictureBuffers.
bool DestroyOutputs(bool dismiss);
// Used by DestroyOutputs.
bool DestroyOutputBuffers();
// Dismiss all |picture_buffer_ids| via Client::DismissPictureBuffer()
// and signal |done| after finishing.
void DismissPictures(const std::vector<int32_t>& picture_buffer_ids,
base::WaitableEvent* done);
// Task to finish initialization on decoder_thread_.
void InitializeTask();
void NotifyError(Error error);
void DestroyTask();
// Check whether a destroy is scheduled.
bool IsDestroyPending();
// Sets the state to kError and notifies client if needed.
void SetErrorState(Error error);
// Event handling. Events include flush, reset and resolution change and are
// processed while in kIdle state.
// Surface set change (resolution change) flow.
// If we have no surfaces allocated, start it immediately, otherwise mark
// ourselves as pending for surface set change.
void InitiateSurfaceSetChange();
// If a surface set change is pending and we are ready, stop the device,
// destroy outputs, releasing resources and dismissing pictures as required,
// followed by starting the flow to allocate a new set for the current
// resolution/DPB size, as provided by decoder.
bool FinishSurfaceSetChange();
// Flush flow when requested by client.
// When Flush() is called, it posts a FlushTask, which checks the input queue.
// If nothing is pending for decode on decoder_input_queue_, we call
// InitiateFlush() directly. Otherwise, we push a dummy BitstreamBufferRef
// onto the decoder_input_queue_ to schedule a flush. When we reach it later
// on, we call InitiateFlush() to perform it at the correct time.
void FlushTask();
// Tell the decoder to flush all frames, reset it and mark us as scheduled
// for flush, so that we can finish it once all pending decodes are finished.
void InitiateFlush();
// To be called if decoder_flushing_ is true. If not all pending frames are
// decoded, return false, requesting the caller to try again later.
// Otherwise perform flush by sending all pending pictures to the client,
// notify it that flush is finished and return true, informing the caller
// that further progress can be made.
bool FinishFlush();
// Reset flow when requested by client.
// Drop all inputs, reset the decoder and mark us as pending for reset.
void ResetTask();
// To be called if decoder_resetting_ is true. If not all pending frames are
// decoded, return false, requesting the caller to try again later.
// Otherwise perform reset by dropping all pending outputs (client is not
// interested anymore), notifying it that reset is finished, and return true,
// informing the caller that further progress can be made.
bool FinishReset();
// Called when a new event is pended. Transitions us into kIdle state (if not
// already in it), if possible. Also starts processing events.
void NewEventPending();
// Called after all events are processed successfully (i.e. all Finish*()
// methods return true) to return to decoding state.
bool FinishEventProcessing();
// Process pending events, if any.
void ProcessPendingEventsIfNeeded();
// Allocate V4L2 buffers and assign them to |buffers| provided by the client
// via AssignPictureBuffers() on decoder thread.
void AssignPictureBuffersTask(const std::vector<PictureBuffer>& buffers);
// Use buffer backed by dmabuf file descriptors in |passed_dmabuf_fds| for the
// OutputRecord associated with |picture_buffer_id|, taking ownership of the
// file descriptors.
void ImportBufferForPictureTask(
int32_t picture_buffer_id,
// TODO(posciak): (https://crbug.com/561749) we should normally be able to
// pass the vector by itself via std::move, but it's not possible to do
// this if this method is used as a callback.
std::unique_ptr<std::vector<base::ScopedFD>> passed_dmabuf_fds);
// Create a GLImage for the buffer associated with V4L2 |buffer_index| and
// for |picture_buffer_id|, backed by dmabuf file descriptors in
// |passed_dmabuf_fds|, taking ownership of them.
// The GLImage will be associated |client_texture_id| in gles2 decoder.
void CreateGLImageFor(
size_t buffer_index,
int32_t picture_buffer_id,
// TODO(posciak): (https://crbug.com/561749) we should normally be able to
// pass the vector by itself via std::move, but it's not possible to do
// this if this method is used as a callback.
std::unique_ptr<std::vector<base::ScopedFD>> passed_dmabuf_fds,
GLuint client_texture_id,
GLuint texture_id,
const gfx::Size& size,
uint32_t fourcc);
// Take the dmabuf |passed_dmabuf_fds|, for |picture_buffer_id|, and use it
// for OutputRecord at |buffer_index|. The buffer is backed by
// |passed_dmabuf_fds|, and the OutputRecord takes ownership of them.
void AssignDmaBufs(
size_t buffer_index,
int32_t picture_buffer_id,
// TODO(posciak): (https://crbug.com/561749) we should normally be able to
// pass the vector by itself via std::move, but it's not possible to do
// this if this method is used as a callback.
std::unique_ptr<std::vector<base::ScopedFD>> passed_dmabuf_fds);
// Performed on decoder_thread_ as a consequence of poll() on decoder_thread_
// returning an event.
void ServiceDeviceTask();
// Schedule poll if we have any buffers queued and the poll thread
// is not stopped (on surface set change).
void SchedulePollIfNeeded();
// Attempt to start/stop device_poll_thread_.
bool StartDevicePoll();
bool StopDevicePoll(bool keep_input_state);
// Ran on device_poll_thread_ to wait for device events.
void DevicePollTask(bool poll_device);
// Buffer id for flush buffer, queued by FlushTask().
const int kFlushBufferId = -2;
// Handler for Decode() on decoder_thread_.
void DecodeTask(scoped_refptr<DecoderBuffer> buffer, int32_t bitstream_id);
// Schedule a new DecodeBufferTask if we are decoding.
void ScheduleDecodeBufferTaskIfNeeded();
// Main decoder loop. Keep decoding the current buffer in decoder_, asking
// for more stream via TrySetNewBistreamBuffer() if decoder_ requests so,
// and handle other returns from it appropriately.
void DecodeBufferTask();
// Check decoder_input_queue_ for any available buffers to decode and
// set the decoder_current_bitstream_buffer_ to the next buffer if one is
// available, taking it off the queue. Also set the current stream pointer
// in decoder_, and return true.
// Return false if no buffers are pending on decoder_input_queue_.
bool TrySetNewBistreamBuffer();
// Task to flag the specified picture buffer for reuse, executed on the
// decoder_thread_. The picture buffer can only be reused after the specified
// fence has been signaled.
void ReusePictureBufferTask(int32_t picture_buffer_id,
std::unique_ptr<gl::GLFenceEGL> egl_fence);
// Called to actually send |dec_surface| to the client - as a result of
// decoding the stream in |bitstream_id| - after it is decoded preserving
// the order in which it was scheduled via SurfaceReady().
void OutputSurface(int32_t bitstream_id,
const scoped_refptr<V4L2DecodeSurface>& dec_surface);
// Goes over the |decoder_display_queue_| and sends all buffers from the
// front of the queue that are already decoded to the client, in order.
void TryOutputSurfaces();
// Send decoded pictures to PictureReady.
void SendPictureReady();
// Callback that indicates a picture has been cleared.
void PictureCleared();
size_t input_planes_count_;
size_t output_planes_count_;
// GPU Child thread task runner.
const scoped_refptr<base::SingleThreadTaskRunner> child_task_runner_;
// Task runner Decode() and PictureReady() run on.
scoped_refptr<base::SingleThreadTaskRunner> decode_task_runner_;
// WeakPtr<> pointing to |this| for use in posting tasks from the decoder or
// device worker threads back to the child thread.
base::WeakPtr<V4L2SliceVideoDecodeAccelerator> weak_this_;
// To expose client callbacks from VideoDecodeAccelerator.
// NOTE: all calls to these objects *MUST* be executed on
// child_task_runner_.
std::unique_ptr<base::WeakPtrFactory<VideoDecodeAccelerator::Client>>
client_ptr_factory_;
base::WeakPtr<VideoDecodeAccelerator::Client> client_;
// Callbacks to |decode_client_| must be executed on |decode_task_runner_|.
base::WeakPtr<Client> decode_client_;
// V4L2 device in use.
scoped_refptr<V4L2Device> device_;
// Thread to communicate with the device on.
base::Thread decoder_thread_;
scoped_refptr<base::SingleThreadTaskRunner> decoder_thread_task_runner_;
// Thread used to poll the device for events.
base::Thread device_poll_thread_;
// Input queue state.
bool input_streamon_;
// Number of input buffers enqueued to the device.
int input_buffer_queued_count_;
// Input buffers ready to use; LIFO since we don't care about ordering.
std::list<int> free_input_buffers_;
// Mapping of int index to an input buffer record.
std::vector<InputRecord> input_buffer_map_;
// Output queue state.
bool output_streamon_;
// Number of output buffers enqueued to the device.
int output_buffer_queued_count_;
// Output buffers ready to use.
std::list<int> free_output_buffers_;
// Mapping of int index to an output buffer record.
std::vector<OutputRecord> output_buffer_map_;
VideoCodecProfile video_profile_;
uint32_t input_format_fourcc_;
uint32_t output_format_fourcc_;
gfx::Size coded_size_;
struct BitstreamBufferRef;
// Input queue of stream buffers coming from the client.
base::queue<std::unique_ptr<BitstreamBufferRef>> decoder_input_queue_;
// BitstreamBuffer currently being processed.
std::unique_ptr<BitstreamBufferRef> decoder_current_bitstream_buffer_;
// Queue storing decode surfaces ready to be output as soon as they are
// decoded, together with the bitstream_id from which they were decoded,
// in order to be able to pass it back to the client.
// The surfaces must be output in order they are queued.
base::queue<std::pair<int32_t, scoped_refptr<V4L2DecodeSurface>>>
decoder_display_queue_;
// Decoder state.
State state_;
// Waitable event signaled when the decoder is destroying.
base::WaitableEvent destroy_pending_;
Config::OutputMode output_mode_;
// If any of these are true, we are waiting for the device to finish decoding
// all previously-queued frames, so we can finish the flush/reset/surface
// change flows. These can stack.
bool decoder_flushing_;
bool decoder_resetting_;
bool surface_set_change_pending_;
// Codec-specific software decoder in use.
std::unique_ptr<AcceleratedVideoDecoder> decoder_;
// Surfaces queued to device to keep references to them while decoded.
using V4L2DecodeSurfaceByOutputId =
std::map<int, scoped_refptr<V4L2DecodeSurface>>;
V4L2DecodeSurfaceByOutputId surfaces_at_device_;
// Surfaces sent to client to keep references to them while displayed.
using V4L2DecodeSurfaceByPictureBufferId =
std::map<int32_t, scoped_refptr<V4L2DecodeSurface>>;
V4L2DecodeSurfaceByPictureBufferId surfaces_at_display_;
// Record for decoded pictures that can be sent to PictureReady.
struct PictureRecord {
PictureRecord(bool cleared, const Picture& picture);
~PictureRecord();
bool cleared; // Whether the texture is cleared and safe to render from.
Picture picture; // The decoded picture.
};
// Pictures that are ready but not sent to PictureReady yet.
base::queue<PictureRecord> pending_picture_ready_;
// The number of pictures that are sent to PictureReady and will be cleared.
int picture_clearing_count_;
// EGL state
EGLDisplay egl_display_;
// Callback to bind a GLImage.
BindGLImageCallback bind_image_cb_;
// Callback to set the correct gl context.
MakeGLContextCurrentCallback make_context_current_cb_;
// The WeakPtrFactory for |weak_this_|.
base::WeakPtrFactory<V4L2SliceVideoDecodeAccelerator> weak_this_factory_;
DISALLOW_COPY_AND_ASSIGN(V4L2SliceVideoDecodeAccelerator);
};
} // namespace media
#endif // MEDIA_GPU_V4L2_V4L2_SLICE_VIDEO_DECODE_ACCELERATOR_H_