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