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102 lines
3.8 KiB
C++
102 lines
3.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef MOZILLA_AUDIONODEEXTERNALINPUTSTREAM_H_
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#define MOZILLA_AUDIONODEEXTERNALINPUTSTREAM_H_
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#include "MediaStreamGraph.h"
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#include "AudioNodeStream.h"
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// Forward declaration for mResamplerMap
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typedef struct SpeexResamplerState_ SpeexResamplerState;
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namespace mozilla {
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/**
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* This is a MediaStream implementation that acts for a Web Audio node but
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* unlike other AudioNodeStreams, supports any kind of MediaStream as an
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* input --- handling any number of audio tracks, resampling them from whatever
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* sample rate they're using, and handling blocking of the input MediaStream.
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*/
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class AudioNodeExternalInputStream : public AudioNodeStream {
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public:
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AudioNodeExternalInputStream(AudioNodeEngine* aEngine, TrackRate aSampleRate);
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~AudioNodeExternalInputStream();
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virtual void ProduceOutput(GraphTime aFrom, GraphTime aTo, uint32_t aFlags) MOZ_OVERRIDE;
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private:
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// For storing pointers and data about input tracks, like the last TrackTick which
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// was read, and the associated speex resampler.
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struct TrackMapEntry {
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~TrackMapEntry();
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/**
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* Resamples data from all chunks in aIterator and following, using mResampler,
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* adding the results to mResampledData.
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*/
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void ResampleInputData(AudioSegment* aSegment);
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/**
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* Resamples a set of channel buffers using mResampler, adding the results
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* to mResampledData.
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*/
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void ResampleChannels(const nsTArray<const void*>& aBuffers,
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uint32_t aInputDuration,
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AudioSampleFormat aFormat,
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float aVolume);
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// mEndOfConsumedInputTicks is the end of the input ticks that we've consumed.
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// 0 if we haven't consumed any yet.
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TrackTicks mEndOfConsumedInputTicks;
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// mEndOfLastInputIntervalInInputStream is the timestamp for the end of the
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// previous interval which was unblocked for both the input and output
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// stream, in the input stream's timeline, or -1 if there wasn't one.
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StreamTime mEndOfLastInputIntervalInInputStream;
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// mEndOfLastInputIntervalInOutputStream is the timestamp for the end of the
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// previous interval which was unblocked for both the input and output
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// stream, in the output stream's timeline, or -1 if there wasn't one.
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StreamTime mEndOfLastInputIntervalInOutputStream;
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/**
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* Number of samples passed to the resampler so far.
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*/
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TrackTicks mSamplesPassedToResampler;
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/**
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* Resampler being applied to this track.
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*/
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SpeexResamplerState* mResampler;
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/**
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* The track data that has been resampled to the rate of the
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* AudioNodeExternalInputStream. All data in these chunks is in floats (or null),
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* and has the number of channels given in mResamplerChannelCount.
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* mResampledData starts at zero in the stream's output track (so generally
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* it will consist of null data followed by actual data).
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*/
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AudioSegment mResampledData;
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/**
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* Number of channels used to create mResampler.
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*/
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uint32_t mResamplerChannelCount;
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/**
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* The ID for the track of the input stream this entry is for.
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*/
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TrackID mTrackID;
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};
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nsTArray<TrackMapEntry> mTrackMap;
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// Amount of track data produced so far. A multiple of WEBAUDIO_BLOCK_SIZE.
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TrackTicks mCurrentOutputPosition;
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/**
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* Creates a TrackMapEntry for the track, if needed. Returns the index
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* of the TrackMapEntry or NoIndex if no entry is needed yet.
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*/
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uint32_t GetTrackMapEntry(const StreamBuffer::Track& aTrack,
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GraphTime aFrom);
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};
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}
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#endif /* MOZILLA_AUDIONODESTREAM_H_ */
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