content/media/AudioNodeExternalInputStream.h@44a2da4a2ab2 (annotated)
content/media/AudioNodeExternalInputStream.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 MOZILLA_AUDIONODEEXTERNALINPUTSTREAM_H_ |
| michael@0 | 7 | #define MOZILLA_AUDIONODEEXTERNALINPUTSTREAM_H_ |
| michael@0 | 8 | |
| michael@0 | 9 | #include "MediaStreamGraph.h" |
| michael@0 | 10 | #include "AudioNodeStream.h" |
| michael@0 | 11 | |
| michael@0 | 12 | // Forward declaration for mResamplerMap |
| michael@0 | 13 | typedef struct SpeexResamplerState_ SpeexResamplerState; |
| michael@0 | 14 | |
| michael@0 | 15 | namespace mozilla { |
| michael@0 | 16 | |
| michael@0 | 17 | /** |
| michael@0 | 18 | * This is a MediaStream implementation that acts for a Web Audio node but |
| michael@0 | 19 | * unlike other AudioNodeStreams, supports any kind of MediaStream as an |
| michael@0 | 20 | * input --- handling any number of audio tracks, resampling them from whatever |
| michael@0 | 21 | * sample rate they're using, and handling blocking of the input MediaStream. |
| michael@0 | 22 | */ |
| michael@0 | 23 | class AudioNodeExternalInputStream : public AudioNodeStream { |
| michael@0 | 24 | public: |
| michael@0 | 25 | AudioNodeExternalInputStream(AudioNodeEngine* aEngine, TrackRate aSampleRate); |
| michael@0 | 26 | ~AudioNodeExternalInputStream(); |
| michael@0 | 27 | |
| michael@0 | 28 | virtual void ProcessInput(GraphTime aFrom, GraphTime aTo, uint32_t aFlags) MOZ_OVERRIDE; |
| michael@0 | 29 | |
| michael@0 | 30 | private: |
| michael@0 | 31 | // For storing pointers and data about input tracks, like the last TrackTick which |
| michael@0 | 32 | // was read, and the associated speex resampler. |
| michael@0 | 33 | struct TrackMapEntry { |
| michael@0 | 34 | ~TrackMapEntry(); |
| michael@0 | 35 | |
| michael@0 | 36 | /** |
| michael@0 | 37 | * Resamples data from all chunks in aIterator and following, using mResampler, |
| michael@0 | 38 | * adding the results to mResampledData. |
| michael@0 | 39 | */ |
| michael@0 | 40 | void ResampleInputData(AudioSegment* aSegment); |
| michael@0 | 41 | /** |
| michael@0 | 42 | * Resamples a set of channel buffers using mResampler, adding the results |
| michael@0 | 43 | * to mResampledData. |
| michael@0 | 44 | */ |
| michael@0 | 45 | void ResampleChannels(const nsTArray<const void*>& aBuffers, |
| michael@0 | 46 | uint32_t aInputDuration, |
| michael@0 | 47 | AudioSampleFormat aFormat, |
| michael@0 | 48 | float aVolume); |
| michael@0 | 49 | |
| michael@0 | 50 | // mEndOfConsumedInputTicks is the end of the input ticks that we've consumed. |
| michael@0 | 51 | // 0 if we haven't consumed any yet. |
| michael@0 | 52 | TrackTicks mEndOfConsumedInputTicks; |
| michael@0 | 53 | // mEndOfLastInputIntervalInInputStream is the timestamp for the end of the |
| michael@0 | 54 | // previous interval which was unblocked for both the input and output |
| michael@0 | 55 | // stream, in the input stream's timeline, or -1 if there wasn't one. |
| michael@0 | 56 | StreamTime mEndOfLastInputIntervalInInputStream; |
| michael@0 | 57 | // mEndOfLastInputIntervalInOutputStream is the timestamp for the end of the |
| michael@0 | 58 | // previous interval which was unblocked for both the input and output |
| michael@0 | 59 | // stream, in the output stream's timeline, or -1 if there wasn't one. |
| michael@0 | 60 | StreamTime mEndOfLastInputIntervalInOutputStream; |
| michael@0 | 61 | /** |
| michael@0 | 62 | * Number of samples passed to the resampler so far. |
| michael@0 | 63 | */ |
| michael@0 | 64 | TrackTicks mSamplesPassedToResampler; |
| michael@0 | 65 | /** |
| michael@0 | 66 | * Resampler being applied to this track. |
| michael@0 | 67 | */ |
| michael@0 | 68 | SpeexResamplerState* mResampler; |
| michael@0 | 69 | /** |
| michael@0 | 70 | * The track data that has been resampled to the rate of the |
| michael@0 | 71 | * AudioNodeExternalInputStream. All data in these chunks is in floats (or null), |
| michael@0 | 72 | * and has the number of channels given in mResamplerChannelCount. |
| michael@0 | 73 | * mResampledData starts at zero in the stream's output track (so generally |
| michael@0 | 74 | * it will consist of null data followed by actual data). |
| michael@0 | 75 | */ |
| michael@0 | 76 | AudioSegment mResampledData; |
| michael@0 | 77 | /** |
| michael@0 | 78 | * Number of channels used to create mResampler. |
| michael@0 | 79 | */ |
| michael@0 | 80 | uint32_t mResamplerChannelCount; |
| michael@0 | 81 | /** |
| michael@0 | 82 | * The ID for the track of the input stream this entry is for. |
| michael@0 | 83 | */ |
| michael@0 | 84 | TrackID mTrackID; |
| michael@0 | 85 | }; |
| michael@0 | 86 | |
| michael@0 | 87 | nsTArray<TrackMapEntry> mTrackMap; |
| michael@0 | 88 | // Amount of track data produced so far. A multiple of WEBAUDIO_BLOCK_SIZE. |
| michael@0 | 89 | TrackTicks mCurrentOutputPosition; |
| michael@0 | 90 | |
| michael@0 | 91 | /** |
| michael@0 | 92 | * Creates a TrackMapEntry for the track, if needed. Returns the index |
| michael@0 | 93 | * of the TrackMapEntry or NoIndex if no entry is needed yet. |
| michael@0 | 94 | */ |
| michael@0 | 95 | uint32_t GetTrackMapEntry(const StreamBuffer::Track& aTrack, |
| michael@0 | 96 | GraphTime aFrom); |
| michael@0 | 97 | }; |
| michael@0 | 98 | |
| michael@0 | 99 | } |
| michael@0 | 100 | |
| michael@0 | 101 | #endif /* MOZILLA_AUDIONODESTREAM_H_ */ |
