content/media/encoder/VP8TrackEncoder.h@44a2da4a2ab2 (annotated)
content/media/encoder/VP8TrackEncoder.h
Fri, 16 Jan 2015 04:50:19 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Fri, 16 Jan 2015 04:50:19 +0100
- branch
- TOR_BUG_9701
- changeset 13
- 44a2da4a2ab2
- permissions
- -rw-r--r--
Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/ |
| michael@0 | 2 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 3 | * License, v. 2.0. If a copy of the MPL was not distributed with this file, |
| michael@0 | 4 | * You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 5 | |
| michael@0 | 6 | #ifndef VP8TrackEncoder_h_ |
| michael@0 | 7 | #define VP8TrackEncoder_h_ |
| michael@0 | 8 | |
| michael@0 | 9 | #include "TrackEncoder.h" |
| michael@0 | 10 | #include "vpx/vpx_codec.h" |
| michael@0 | 11 | |
| michael@0 | 12 | namespace mozilla { |
| michael@0 | 13 | |
| michael@0 | 14 | typedef struct vpx_codec_ctx vpx_codec_ctx_t; |
| michael@0 | 15 | typedef struct vpx_codec_enc_cfg vpx_codec_enc_cfg_t; |
| michael@0 | 16 | typedef struct vpx_image vpx_image_t; |
| michael@0 | 17 | |
| michael@0 | 18 | /** |
| michael@0 | 19 | * VP8TrackEncoder implements VideoTrackEncoder by using libvpx library. |
| michael@0 | 20 | * We implement a realtime and fixed FPS encoder. In order to achieve that, |
| michael@0 | 21 | * there is a pick target frame and drop frame encoding policy implemented in |
| michael@0 | 22 | * GetEncodedTrack. |
| michael@0 | 23 | */ |
| michael@0 | 24 | class VP8TrackEncoder : public VideoTrackEncoder |
| michael@0 | 25 | { |
| michael@0 | 26 | enum EncodeOperation { |
| michael@0 | 27 | ENCODE_NORMAL_FRAME, // VP8 track encoder works normally. |
| michael@0 | 28 | ENCODE_I_FRAME, // The next frame will be encoded as I-Frame. |
| michael@0 | 29 | SKIP_FRAME, // Skip the next frame. |
| michael@0 | 30 | }; |
| michael@0 | 31 | public: |
| michael@0 | 32 | VP8TrackEncoder(); |
| michael@0 | 33 | virtual ~VP8TrackEncoder(); |
| michael@0 | 34 | |
| michael@0 | 35 | already_AddRefed<TrackMetadataBase> GetMetadata() MOZ_FINAL MOZ_OVERRIDE; |
| michael@0 | 36 | |
| michael@0 | 37 | nsresult GetEncodedTrack(EncodedFrameContainer& aData) MOZ_FINAL MOZ_OVERRIDE; |
| michael@0 | 38 | |
| michael@0 | 39 | protected: |
| michael@0 | 40 | nsresult Init(int32_t aWidth, int32_t aHeight, |
| michael@0 | 41 | int32_t aDisplayWidth, int32_t aDisplayHeight, |
| michael@0 | 42 | TrackRate aTrackRate) MOZ_FINAL MOZ_OVERRIDE; |
| michael@0 | 43 | |
| michael@0 | 44 | private: |
| michael@0 | 45 | // Calculate the target frame's encoded duration. |
| michael@0 | 46 | TrackTicks CalculateEncodedDuration(TrackTicks aDurationCopied); |
| michael@0 | 47 | |
| michael@0 | 48 | // Calculate the mRemainingTicks for next target frame. |
| michael@0 | 49 | TrackTicks CalculateRemainingTicks(TrackTicks aDurationCopied, |
| michael@0 | 50 | TrackTicks aEncodedDuration); |
| michael@0 | 51 | |
| michael@0 | 52 | // Get the EncodeOperation for next target frame. |
| michael@0 | 53 | EncodeOperation GetNextEncodeOperation(TimeDuration aTimeElapsed, |
| michael@0 | 54 | TrackTicks aProcessedDuration); |
| michael@0 | 55 | |
| michael@0 | 56 | // Get the encoded data from encoder to aData. |
| michael@0 | 57 | nsresult GetEncodedPartitions(EncodedFrameContainer& aData); |
| michael@0 | 58 | |
| michael@0 | 59 | // Prepare the input data to the mVPXImageWrapper for encoding. |
| michael@0 | 60 | nsresult PrepareRawFrame(VideoChunk &aChunk); |
| michael@0 | 61 | |
| michael@0 | 62 | // Prepare the muted frame data to the mVPXImageWrapper for encoding. |
| michael@0 | 63 | void PrepareMutedFrame(); |
| michael@0 | 64 | |
| michael@0 | 65 | // Output frame rate. |
| michael@0 | 66 | uint32_t mEncodedFrameRate; |
| michael@0 | 67 | // Duration for the output frame, reciprocal to mEncodedFrameRate. |
| michael@0 | 68 | TrackTicks mEncodedFrameDuration; |
| michael@0 | 69 | // Encoded timestamp. |
| michael@0 | 70 | TrackTicks mEncodedTimestamp; |
| michael@0 | 71 | // Duration to the next encode frame. |
| michael@0 | 72 | TrackTicks mRemainingTicks; |
| michael@0 | 73 | |
| michael@0 | 74 | // Muted frame, we only create it once. |
| michael@0 | 75 | nsTArray<uint8_t> mMuteFrame; |
| michael@0 | 76 | |
| michael@0 | 77 | // I420 frame, convert the 4:4:4, 4:2:2 to I420. |
| michael@0 | 78 | nsTArray<uint8_t> mI420Frame; |
| michael@0 | 79 | |
| michael@0 | 80 | /** |
| michael@0 | 81 | * A local segment queue which takes the raw data out from mRawSegment in the |
| michael@0 | 82 | * call of GetEncodedTrack(). Since we implement the fixed FPS encoding |
| michael@0 | 83 | * policy, it needs to be global in order to store the leftover segments |
| michael@0 | 84 | * taken from mRawSegment. |
| michael@0 | 85 | */ |
| michael@0 | 86 | VideoSegment mSourceSegment; |
| michael@0 | 87 | |
| michael@0 | 88 | // VP8 relative members. |
| michael@0 | 89 | // Codec context structure. |
| michael@0 | 90 | nsAutoPtr<vpx_codec_ctx_t> mVPXContext; |
| michael@0 | 91 | // Image Descriptor. |
| michael@0 | 92 | nsAutoPtr<vpx_image_t> mVPXImageWrapper; |
| michael@0 | 93 | }; |
| michael@0 | 94 | |
| michael@0 | 95 | } // namespace mozilla |
| michael@0 | 96 | |
| michael@0 | 97 | #endif |
