content/media/encoder/OpusTrackEncoder.h@6474c204b198 (annotated)
content/media/encoder/OpusTrackEncoder.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| 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 OpusTrackEncoder_h_ |
| michael@0 | 7 | #define OpusTrackEncoder_h_ |
| michael@0 | 8 | |
| michael@0 | 9 | #include <stdint.h> |
| michael@0 | 10 | #include <speex/speex_resampler.h> |
| michael@0 | 11 | #include "TrackEncoder.h" |
| michael@0 | 12 | |
| michael@0 | 13 | struct OpusEncoder; |
| michael@0 | 14 | |
| michael@0 | 15 | namespace mozilla { |
| michael@0 | 16 | |
| michael@0 | 17 | // Opus meta data structure |
| michael@0 | 18 | class OpusMetadata : public TrackMetadataBase |
| michael@0 | 19 | { |
| michael@0 | 20 | public: |
| michael@0 | 21 | // The ID Header of OggOpus. refer to http://wiki.xiph.org/OggOpus. |
| michael@0 | 22 | nsTArray<uint8_t> mIdHeader; |
| michael@0 | 23 | // The Comment Header of OggOpus. |
| michael@0 | 24 | nsTArray<uint8_t> mCommentHeader; |
| michael@0 | 25 | |
| michael@0 | 26 | MetadataKind GetKind() const MOZ_OVERRIDE { return METADATA_OPUS; } |
| michael@0 | 27 | }; |
| michael@0 | 28 | |
| michael@0 | 29 | class OpusTrackEncoder : public AudioTrackEncoder |
| michael@0 | 30 | { |
| michael@0 | 31 | public: |
| michael@0 | 32 | OpusTrackEncoder(); |
| michael@0 | 33 | virtual ~OpusTrackEncoder(); |
| michael@0 | 34 | |
| michael@0 | 35 | already_AddRefed<TrackMetadataBase> GetMetadata() MOZ_OVERRIDE; |
| michael@0 | 36 | |
| michael@0 | 37 | nsresult GetEncodedTrack(EncodedFrameContainer& aData) MOZ_OVERRIDE; |
| michael@0 | 38 | |
| michael@0 | 39 | protected: |
| michael@0 | 40 | int GetPacketDuration(); |
| michael@0 | 41 | |
| michael@0 | 42 | nsresult Init(int aChannels, int aSamplingRate) MOZ_OVERRIDE; |
| michael@0 | 43 | |
| michael@0 | 44 | /** |
| michael@0 | 45 | * Get the samplerate of the data to be fed to the Opus encoder. This might be |
| michael@0 | 46 | * different from the input samplerate if resampling occurs. |
| michael@0 | 47 | */ |
| michael@0 | 48 | int GetOutputSampleRate(); |
| michael@0 | 49 | |
| michael@0 | 50 | private: |
| michael@0 | 51 | /** |
| michael@0 | 52 | * The Opus encoder from libopus. |
| michael@0 | 53 | */ |
| michael@0 | 54 | OpusEncoder* mEncoder; |
| michael@0 | 55 | |
| michael@0 | 56 | /** |
| michael@0 | 57 | * A local segment queue which takes the raw data out from mRawSegment in the |
| michael@0 | 58 | * call of GetEncodedTrack(). Opus encoder only accepts GetPacketDuration() |
| michael@0 | 59 | * samples from mSourceSegment every encoding cycle, thus it needs to be |
| michael@0 | 60 | * global in order to store the leftover segments taken from mRawSegment. |
| michael@0 | 61 | */ |
| michael@0 | 62 | AudioSegment mSourceSegment; |
| michael@0 | 63 | |
| michael@0 | 64 | /** |
| michael@0 | 65 | * Total samples of delay added by codec, can be queried by the encoder. From |
| michael@0 | 66 | * the perspective of decoding, real data begins this many samples late, so |
| michael@0 | 67 | * the encoder needs to append this many null samples to the end of stream, |
| michael@0 | 68 | * in order to align the time of input and output. |
| michael@0 | 69 | */ |
| michael@0 | 70 | int mLookahead; |
| michael@0 | 71 | |
| michael@0 | 72 | /** |
| michael@0 | 73 | * If the input sample rate does not divide 48kHz evenly, the input data are |
| michael@0 | 74 | * resampled. |
| michael@0 | 75 | */ |
| michael@0 | 76 | SpeexResamplerState* mResampler; |
| michael@0 | 77 | |
| michael@0 | 78 | /** |
| michael@0 | 79 | * Store the resampled frames that don't fit into an Opus packet duration. |
| michael@0 | 80 | * They will be prepended to the resampled frames next encoding cycle. |
| michael@0 | 81 | */ |
| michael@0 | 82 | nsTArray<AudioDataValue> mResampledLeftover; |
| michael@0 | 83 | }; |
| michael@0 | 84 | |
| michael@0 | 85 | } |
| michael@0 | 86 | #endif |
