1 // Copyright 2013 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 #ifndef CONTENT_COMMON_GPU_MEDIA_ANDROID_VIDEO_ENCODE_ACCELERATOR_H_
6 #define CONTENT_COMMON_GPU_MEDIA_ANDROID_VIDEO_ENCODE_ACCELERATOR_H_
12 #include "base/memory/weak_ptr.h"
13 #include "base/threading/thread_checker.h"
14 #include "base/timer/timer.h"
15 #include "base/tuple.h"
16 #include "content/common/content_export.h"
17 #include "media/base/android/media_codec_bridge.h"
18 #include "media/video/video_encode_accelerator.h"
21 class BitstreamBuffer;
26 // Android-specific implementation of media::VideoEncodeAccelerator, enabling
27 // hardware-acceleration of video encoding, based on Android's MediaCodec class
28 // (http://developer.android.com/reference/android/media/MediaCodec.html). This
29 // class expects to live and be called on a single thread (the GPU process'
31 class CONTENT_EXPORT AndroidVideoEncodeAccelerator
32 : public media::VideoEncodeAccelerator {
34 AndroidVideoEncodeAccelerator();
35 virtual ~AndroidVideoEncodeAccelerator();
37 // media::VideoEncodeAccelerator implementation.
38 virtual std::vector<media::VideoEncodeAccelerator::SupportedProfile>
39 GetSupportedProfiles() OVERRIDE;
40 virtual bool Initialize(media::VideoFrame::Format format,
41 const gfx::Size& input_visible_size,
42 media::VideoCodecProfile output_profile,
43 uint32 initial_bitrate,
44 Client* client) OVERRIDE;
45 virtual void Encode(const scoped_refptr<media::VideoFrame>& frame,
46 bool force_keyframe) OVERRIDE;
47 virtual void UseOutputBitstreamBuffer(const media::BitstreamBuffer& buffer)
49 virtual void RequestEncodingParametersChange(uint32 bitrate,
50 uint32 framerate) OVERRIDE;
51 virtual void Destroy() OVERRIDE;
56 INITIAL_FRAMERATE = 30,
57 // Until there are non-realtime users, no need for unrequested I-frames.
58 IFRAME_INTERVAL = kint32max,
61 // Impedance-mismatch fixers: MediaCodec is a poll-based API but VEA is a
62 // push-based API; these methods turn the crank to make the two work together.
67 // Returns true if we don't need more or bigger output buffers.
68 bool DoOutputBuffersSuffice();
70 // Start & stop |io_timer_| if the time seems right.
71 void MaybeStartIOTimer();
72 void MaybeStopIOTimer();
74 // Used to DCHECK that we are called on the correct thread.
75 base::ThreadChecker thread_checker_;
77 // VideoDecodeAccelerator::Client callbacks go here. Invalidated once any
79 scoped_ptr<base::WeakPtrFactory<Client> > client_ptr_factory_;
81 scoped_ptr<media::VideoCodecBridge> media_codec_;
83 // Bitstream buffers waiting to be populated & returned to the client.
84 std::vector<media::BitstreamBuffer> available_bitstream_buffers_;
86 // Frames waiting to be passed to the codec, queued until an input buffer is
87 // available. Each element is a tuple of <Frame, key_frame, enqueue_time>.
89 Tuple3<scoped_refptr<media::VideoFrame>, bool, base::Time> >
91 PendingFrames pending_frames_;
93 // Repeating timer responsible for draining pending IO to the codec.
94 base::RepeatingTimer<AndroidVideoEncodeAccelerator> io_timer_;
96 // The difference between number of buffers queued & dequeued at the codec.
97 int32 num_buffers_at_codec_;
99 // A monotonically-growing value, used as a fake timestamp just to keep things
100 // appearing to move forward.
101 base::TimeDelta fake_input_timestamp_;
103 // Number of requested output buffers and their capacity.
104 int num_output_buffers_; // -1 until RequireBitstreamBuffers.
105 size_t output_buffers_capacity_; // 0 until RequireBitstreamBuffers.
107 uint32 last_set_bitrate_; // In bps.
109 DISALLOW_COPY_AND_ASSIGN(AndroidVideoEncodeAccelerator);
112 } // namespace content
114 #endif // CONTENT_COMMON_GPU_MEDIA_ANDROID_VIDEO_ENCODE_ACCELERATOR_H_