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comparison: content/media/AudioNodeExternalInputStream.h
content/media/AudioNodeExternalInputStream.h
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- TOR_BUG_9701
- changeset 11
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| -1:000000000000 | 0:4242d0f2c557 |
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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 MOZILLA_AUDIONODEEXTERNALINPUTSTREAM_H_ | |
| 7 #define MOZILLA_AUDIONODEEXTERNALINPUTSTREAM_H_ | |
| 8 | |
| 9 #include "MediaStreamGraph.h" | |
| 10 #include "AudioNodeStream.h" | |
| 11 | |
| 12 // Forward declaration for mResamplerMap | |
| 13 typedef struct SpeexResamplerState_ SpeexResamplerState; | |
| 14 | |
| 15 namespace mozilla { | |
| 16 | |
| 17 /** | |
| 18 * This is a MediaStream implementation that acts for a Web Audio node but | |
| 19 * unlike other AudioNodeStreams, supports any kind of MediaStream as an | |
| 20 * input --- handling any number of audio tracks, resampling them from whatever | |
| 21 * sample rate they're using, and handling blocking of the input MediaStream. | |
| 22 */ | |
| 23 class AudioNodeExternalInputStream : public AudioNodeStream { | |
| 24 public: | |
| 25 AudioNodeExternalInputStream(AudioNodeEngine* aEngine, TrackRate aSampleRate); | |
| 26 ~AudioNodeExternalInputStream(); | |
| 27 | |
| 28 virtual void ProcessInput(GraphTime aFrom, GraphTime aTo, uint32_t aFlags) MOZ_OVERRIDE; | |
| 29 | |
| 30 private: | |
| 31 // For storing pointers and data about input tracks, like the last TrackTick which | |
| 32 // was read, and the associated speex resampler. | |
| 33 struct TrackMapEntry { | |
| 34 ~TrackMapEntry(); | |
| 35 | |
| 36 /** | |
| 37 * Resamples data from all chunks in aIterator and following, using mResampler, | |
| 38 * adding the results to mResampledData. | |
| 39 */ | |
| 40 void ResampleInputData(AudioSegment* aSegment); | |
| 41 /** | |
| 42 * Resamples a set of channel buffers using mResampler, adding the results | |
| 43 * to mResampledData. | |
| 44 */ | |
| 45 void ResampleChannels(const nsTArray<const void*>& aBuffers, | |
| 46 uint32_t aInputDuration, | |
| 47 AudioSampleFormat aFormat, | |
| 48 float aVolume); | |
| 49 | |
| 50 // mEndOfConsumedInputTicks is the end of the input ticks that we've consumed. | |
| 51 // 0 if we haven't consumed any yet. | |
| 52 TrackTicks mEndOfConsumedInputTicks; | |
| 53 // mEndOfLastInputIntervalInInputStream is the timestamp for the end of the | |
| 54 // previous interval which was unblocked for both the input and output | |
| 55 // stream, in the input stream's timeline, or -1 if there wasn't one. | |
| 56 StreamTime mEndOfLastInputIntervalInInputStream; | |
| 57 // mEndOfLastInputIntervalInOutputStream is the timestamp for the end of the | |
| 58 // previous interval which was unblocked for both the input and output | |
| 59 // stream, in the output stream's timeline, or -1 if there wasn't one. | |
| 60 StreamTime mEndOfLastInputIntervalInOutputStream; | |
| 61 /** | |
| 62 * Number of samples passed to the resampler so far. | |
| 63 */ | |
| 64 TrackTicks mSamplesPassedToResampler; | |
| 65 /** | |
| 66 * Resampler being applied to this track. | |
| 67 */ | |
| 68 SpeexResamplerState* mResampler; | |
| 69 /** | |
| 70 * The track data that has been resampled to the rate of the | |
| 71 * AudioNodeExternalInputStream. All data in these chunks is in floats (or null), | |
| 72 * and has the number of channels given in mResamplerChannelCount. | |
| 73 * mResampledData starts at zero in the stream's output track (so generally | |
| 74 * it will consist of null data followed by actual data). | |
| 75 */ | |
| 76 AudioSegment mResampledData; | |
| 77 /** | |
| 78 * Number of channels used to create mResampler. | |
| 79 */ | |
| 80 uint32_t mResamplerChannelCount; | |
| 81 /** | |
| 82 * The ID for the track of the input stream this entry is for. | |
| 83 */ | |
| 84 TrackID mTrackID; | |
| 85 }; | |
| 86 | |
| 87 nsTArray<TrackMapEntry> mTrackMap; | |
| 88 // Amount of track data produced so far. A multiple of WEBAUDIO_BLOCK_SIZE. | |
| 89 TrackTicks mCurrentOutputPosition; | |
| 90 | |
| 91 /** | |
| 92 * Creates a TrackMapEntry for the track, if needed. Returns the index | |
| 93 * of the TrackMapEntry or NoIndex if no entry is needed yet. | |
| 94 */ | |
| 95 uint32_t GetTrackMapEntry(const StreamBuffer::Track& aTrack, | |
| 96 GraphTime aFrom); | |
| 97 }; | |
| 98 | |
| 99 } | |
| 100 | |
| 101 #endif /* MOZILLA_AUDIONODESTREAM_H_ */ |
