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comparison: content/media/encoder/OpusTrackEncoder.h
content/media/encoder/OpusTrackEncoder.h
- branch
- TOR_BUG_9701
- changeset 13
- 44a2da4a2ab2
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| -1:000000000000 | 0:5f14e7474e4f |
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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 OpusTrackEncoder_h_ | |
| 7 #define OpusTrackEncoder_h_ | |
| 8 | |
| 9 #include <stdint.h> | |
| 10 #include <speex/speex_resampler.h> | |
| 11 #include "TrackEncoder.h" | |
| 12 | |
| 13 struct OpusEncoder; | |
| 14 | |
| 15 namespace mozilla { | |
| 16 | |
| 17 // Opus meta data structure | |
| 18 class OpusMetadata : public TrackMetadataBase | |
| 19 { | |
| 20 public: | |
| 21 // The ID Header of OggOpus. refer to http://wiki.xiph.org/OggOpus. | |
| 22 nsTArray<uint8_t> mIdHeader; | |
| 23 // The Comment Header of OggOpus. | |
| 24 nsTArray<uint8_t> mCommentHeader; | |
| 25 | |
| 26 MetadataKind GetKind() const MOZ_OVERRIDE { return METADATA_OPUS; } | |
| 27 }; | |
| 28 | |
| 29 class OpusTrackEncoder : public AudioTrackEncoder | |
| 30 { | |
| 31 public: | |
| 32 OpusTrackEncoder(); | |
| 33 virtual ~OpusTrackEncoder(); | |
| 34 | |
| 35 already_AddRefed<TrackMetadataBase> GetMetadata() MOZ_OVERRIDE; | |
| 36 | |
| 37 nsresult GetEncodedTrack(EncodedFrameContainer& aData) MOZ_OVERRIDE; | |
| 38 | |
| 39 protected: | |
| 40 int GetPacketDuration(); | |
| 41 | |
| 42 nsresult Init(int aChannels, int aSamplingRate) MOZ_OVERRIDE; | |
| 43 | |
| 44 /** | |
| 45 * Get the samplerate of the data to be fed to the Opus encoder. This might be | |
| 46 * different from the input samplerate if resampling occurs. | |
| 47 */ | |
| 48 int GetOutputSampleRate(); | |
| 49 | |
| 50 private: | |
| 51 /** | |
| 52 * The Opus encoder from libopus. | |
| 53 */ | |
| 54 OpusEncoder* mEncoder; | |
| 55 | |
| 56 /** | |
| 57 * A local segment queue which takes the raw data out from mRawSegment in the | |
| 58 * call of GetEncodedTrack(). Opus encoder only accepts GetPacketDuration() | |
| 59 * samples from mSourceSegment every encoding cycle, thus it needs to be | |
| 60 * global in order to store the leftover segments taken from mRawSegment. | |
| 61 */ | |
| 62 AudioSegment mSourceSegment; | |
| 63 | |
| 64 /** | |
| 65 * Total samples of delay added by codec, can be queried by the encoder. From | |
| 66 * the perspective of decoding, real data begins this many samples late, so | |
| 67 * the encoder needs to append this many null samples to the end of stream, | |
| 68 * in order to align the time of input and output. | |
| 69 */ | |
| 70 int mLookahead; | |
| 71 | |
| 72 /** | |
| 73 * If the input sample rate does not divide 48kHz evenly, the input data are | |
| 74 * resampled. | |
| 75 */ | |
| 76 SpeexResamplerState* mResampler; | |
| 77 | |
| 78 /** | |
| 79 * Store the resampled frames that don't fit into an Opus packet duration. | |
| 80 * They will be prepended to the resampled frames next encoding cycle. | |
| 81 */ | |
| 82 nsTArray<AudioDataValue> mResampledLeftover; | |
| 83 }; | |
| 84 | |
| 85 } | |
| 86 #endif |
