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