1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 // This file contains an implementation of VideoDecoderAccelerator
6 // that utilizes hardware video decoder present on Intel CPUs.
8 #ifndef CONTENT_COMMON_GPU_MEDIA_VAAPI_VIDEO_DECODE_ACCELERATOR_H_
9 #define CONTENT_COMMON_GPU_MEDIA_VAAPI_VIDEO_DECODE_ACCELERATOR_H_
11 #if defined(USE_OZONE)
12 #include <wayland-client.h>
20 #include "base/logging.h"
21 #include "base/memory/linked_ptr.h"
22 #include "base/memory/shared_memory.h"
23 #include "base/memory/weak_ptr.h"
24 #include "base/message_loop/message_loop.h"
25 #include "base/synchronization/condition_variable.h"
26 #include "base/synchronization/lock.h"
27 #include "base/threading/non_thread_safe.h"
28 #include "base/threading/thread.h"
29 #include "content/common/content_export.h"
30 #include "content/common/gpu/media/vaapi_h264_decoder.h"
31 #include "content/common/gpu/media/vaapi_wrapper.h"
32 #include "content/common/gpu/media/video_decode_accelerator_impl.h"
33 #include "media/base/bitstream_buffer.h"
34 #include "media/video/picture.h"
35 #include "media/video/video_decode_accelerator.h"
36 #include "ui/gl/gl_bindings.h"
40 // Class to provide video decode acceleration for Intel systems with hardware
41 // support for it, and on which libva is available.
42 // Decoding tasks are performed in a separate decoding thread.
44 // Threading/life-cycle: this object is created & destroyed on the GPU
45 // ChildThread. A few methods on it are called on the decoder thread which is
46 // stopped during |this->Destroy()|, so any tasks posted to the decoder thread
47 // can assume |*this| is still alive. See |weak_this_| below for more details.
48 class CONTENT_EXPORT VaapiVideoDecodeAccelerator
49 : public VideoDecodeAcceleratorImpl {
51 #if defined(USE_OZONE)
52 VaapiVideoDecodeAccelerator(
53 const base::Callback<bool(void)>& make_context_current); //NOLINT
55 VaapiVideoDecodeAccelerator(
57 const base::Callback<bool(void)>& make_context_current);
59 virtual ~VaapiVideoDecodeAccelerator();
61 // media::VideoDecodeAccelerator implementation.
62 virtual bool Initialize(media::VideoCodecProfile profile,
63 Client* client) OVERRIDE;
64 virtual void Decode(const media::BitstreamBuffer& bitstream_buffer) OVERRIDE;
65 virtual void AssignPictureBuffers(
66 const std::vector<media::PictureBuffer>& buffers) OVERRIDE;
67 virtual void ReusePictureBuffer(int32 picture_buffer_id) OVERRIDE;
68 virtual void Flush() OVERRIDE;
69 virtual void Reset() OVERRIDE;
70 virtual void Destroy() OVERRIDE;
73 // Notify the client that an error has occurred and decoding cannot continue.
74 void NotifyError(Error error);
76 // Map the received input buffer into this process' address space and
77 // queue it for decode.
78 void MapAndQueueNewInputBuffer(
79 const media::BitstreamBuffer& bitstream_buffer);
81 // Get a new input buffer from the queue and set it up in decoder. This will
82 // sleep if no input buffers are available. Return true if a new buffer has
83 // been set up, false if an early exit has been requested (due to initiated
84 // reset/flush/destroy).
85 bool GetInputBuffer_Locked();
87 // Signal the client that the current buffer has been read and can be
88 // returned. Will also release the mapping.
89 void ReturnCurrInputBuffer_Locked();
91 // Pass one or more output buffers to the decoder. This will sleep
92 // if no buffers are available. Return true if buffers have been set up or
93 // false if an early exit has been requested (due to initiated
94 // reset/flush/destroy).
95 bool FeedDecoderWithOutputSurfaces_Locked();
97 // Continue decoding given input buffers and sleep waiting for input/output
98 // as needed. Will exit if a new set of surfaces or reset/flush/destroy
102 // Scheduled after receiving a flush request and executed after the current
103 // decoding task finishes decoding pending inputs. Makes the decoder return
104 // all remaining output pictures and puts it in an idle state, ready
105 // to resume if needed and schedules a FinishFlush.
108 // Scheduled by the FlushTask after decoder is flushed to put VAVDA into idle
109 // state and notify the client that flushing has been finished.
112 // Scheduled after receiving a reset request and executed after the current
113 // decoding task finishes decoding the current frame. Puts the decoder into
114 // an idle state, ready to resume if needed, discarding decoded but not yet
115 // outputted pictures (decoder keeps ownership of their associated picture
116 // buffers). Schedules a FinishReset afterwards.
119 // Scheduled by ResetTask after it's done putting VAVDA into an idle state.
120 // Drops remaining input buffers and notifies the client that reset has been
124 // Helper for Destroy(), doing all the actual work except for deleting self.
127 // Get a usable framebuffer configuration for use in binding textures
128 // or return false on failure.
129 bool InitializeFBConfig();
131 // Callback for the decoder to execute when it wants us to output given
133 void SurfaceReady(int32 input_id, const scoped_refptr<VASurface>& va_surface);
135 // Represents a texture bound to an X Pixmap for output purposes.
138 // Callback to be executed once we have a |va_surface| to be output and
139 // an available |tfp_picture| to use for output.
140 // Puts contents of |va_surface| into given |tfp_picture|, releases the
141 // surface and passes the resulting picture to client for output.
142 void OutputPicture(const scoped_refptr<VASurface>& va_surface,
144 TFPPicture* tfp_picture);
146 // Try to OutputPicture() if we have both a ready surface and picture.
147 void TryOutputSurface();
149 // Called when a VASurface is no longer in use by the decoder or is not being
150 // synced/waiting to be synced to a picture. Returns it to available surfaces
152 void RecycleVASurfaceID(VASurfaceID va_surface_id);
154 // Initiate wait cycle for surfaces to be released before we release them
155 // and allocate new ones, as requested by the decoder.
156 void InitiateSurfaceSetChange(size_t num_pics, gfx::Size size);
157 // Check if the surfaces have been released or post ourselves for later.
158 void TryFinishSurfaceSetChange();
160 #if defined(USE_OZONE)
161 wl_display* wl_display_;
162 base::Callback<bool(void)> make_context_current_; //NOLINT
164 // Client-provided X/GLX state.
166 base::Callback<bool(void)> make_context_current_;
167 GLXFBConfig fb_config_;
172 // Initialize() not called yet or failed.
174 // DecodeTask running.
176 // Resetting, waiting for decoder to finish current task and cleanup.
178 // Flushing, waiting for decoder to finish current task and cleanup.
180 // Idle, decoder in state ready to start/resume decoding.
182 // Destroying, waiting for the decoder to finish current task.
186 // Protects input buffer and surface queues and state_.
190 // An input buffer awaiting consumption, provided by the client.
197 scoped_ptr<base::SharedMemory> shm;
200 // Queue for incoming input buffers.
201 typedef std::queue<linked_ptr<InputBuffer> > InputBuffers;
202 InputBuffers input_buffers_;
203 // Signalled when input buffers are queued onto the input_buffers_ queue.
204 base::ConditionVariable input_ready_;
206 // Current input buffer at decoder.
207 linked_ptr<InputBuffer> curr_input_buffer_;
209 // Queue for incoming output buffers (texture ids).
210 typedef std::queue<int32> OutputBuffers;
211 OutputBuffers output_buffers_;
213 typedef std::map<int32, linked_ptr<TFPPicture> > TFPPictures;
214 // All allocated TFPPictures, regardless of their current state. TFPPictures
215 // are allocated once and destroyed at the end of decode.
216 TFPPictures tfp_pictures_;
218 // Return a TFPPicture associated with given client-provided id.
219 TFPPicture* TFPPictureById(int32 picture_buffer_id);
221 // VA Surfaces no longer in use that can be passed back to the decoder for
222 // reuse, once it requests them.
223 std::list<VASurfaceID> available_va_surfaces_;
224 // Signalled when output surfaces are queued onto the available_va_surfaces_
226 base::ConditionVariable surfaces_available_;
228 // Pending output requests from the decoder. When it indicates that we should
229 // output a surface and we have an available TFPPicture (i.e. texture) ready
230 // to use, we'll execute the callback passing the TFPPicture. The callback
231 // will put the contents of the surface into the picture and return it to
232 // the client, releasing the surface as well.
233 // If we don't have any available TFPPictures at the time when the decoder
234 // requests output, we'll store the request on pending_output_cbs_ queue for
235 // later and run it once the client gives us more textures
236 // via ReusePictureBuffer().
237 typedef base::Callback<void(TFPPicture*)> OutputCB;
238 std::queue<OutputCB> pending_output_cbs_;
240 // ChildThread's message loop
241 base::MessageLoop* message_loop_;
243 // WeakPtr<> pointing to |this| for use in posting tasks from the decoder
244 // thread back to the ChildThread. Because the decoder thread is a member of
245 // this class, any task running on the decoder thread is guaranteed that this
246 // object is still alive. As a result, tasks posted from ChildThread to
247 // decoder thread should use base::Unretained(this), and tasks posted from the
248 // decoder thread to the ChildThread should use |weak_this_|.
249 base::WeakPtr<VaapiVideoDecodeAccelerator> weak_this_;
251 // Callback used when creating VASurface objects.
252 VASurface::ReleaseCB va_surface_release_cb_;
254 // To expose client callbacks from VideoDecodeAccelerator.
255 // NOTE: all calls to these objects *MUST* be executed on message_loop_.
256 scoped_ptr<base::WeakPtrFactory<Client> > client_ptr_factory_;
257 base::WeakPtr<Client> client_;
259 scoped_ptr<VaapiWrapper> vaapi_wrapper_;
261 // Comes after vaapi_wrapper_ to ensure its destructor is executed before
262 // vaapi_wrapper_ is destroyed.
263 scoped_ptr<VaapiH264Decoder> decoder_;
264 base::Thread decoder_thread_;
265 // Use this to post tasks to |decoder_thread_| instead of
266 // |decoder_thread_.message_loop()| because the latter will be NULL once
267 // |decoder_thread_.Stop()| returns.
268 scoped_refptr<base::MessageLoopProxy> decoder_thread_proxy_;
270 int num_frames_at_client_;
271 int num_stream_bufs_at_decoder_;
273 // Whether we are waiting for any pending_output_cbs_ to be run before
274 // NotifyingFlushDone.
275 bool finish_flush_pending_;
277 // Decoder requested a new surface set and we are waiting for all the surfaces
278 // to be returned before we can free them.
279 bool awaiting_va_surfaces_recycle_;
281 // Last requested number/resolution of output picture buffers.
282 size_t requested_num_pics_;
283 gfx::Size requested_pic_size_;
285 // The WeakPtrFactory for |weak_this_|.
286 base::WeakPtrFactory<VaapiVideoDecodeAccelerator> weak_this_factory_;
288 DISALLOW_COPY_AND_ASSIGN(VaapiVideoDecodeAccelerator);
291 } // namespace content
293 #endif // CONTENT_COMMON_GPU_MEDIA_VAAPI_VIDEO_DECODE_ACCELERATOR_H_