1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/AudioNodeExternalInputStream.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,101 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this file,
1.7 + * You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#ifndef MOZILLA_AUDIONODEEXTERNALINPUTSTREAM_H_
1.10 +#define MOZILLA_AUDIONODEEXTERNALINPUTSTREAM_H_
1.11 +
1.12 +#include "MediaStreamGraph.h"
1.13 +#include "AudioNodeStream.h"
1.14 +
1.15 +// Forward declaration for mResamplerMap
1.16 +typedef struct SpeexResamplerState_ SpeexResamplerState;
1.17 +
1.18 +namespace mozilla {
1.19 +
1.20 +/**
1.21 + * This is a MediaStream implementation that acts for a Web Audio node but
1.22 + * unlike other AudioNodeStreams, supports any kind of MediaStream as an
1.23 + * input --- handling any number of audio tracks, resampling them from whatever
1.24 + * sample rate they're using, and handling blocking of the input MediaStream.
1.25 + */
1.26 +class AudioNodeExternalInputStream : public AudioNodeStream {
1.27 +public:
1.28 + AudioNodeExternalInputStream(AudioNodeEngine* aEngine, TrackRate aSampleRate);
1.29 + ~AudioNodeExternalInputStream();
1.30 +
1.31 + virtual void ProcessInput(GraphTime aFrom, GraphTime aTo, uint32_t aFlags) MOZ_OVERRIDE;
1.32 +
1.33 +private:
1.34 + // For storing pointers and data about input tracks, like the last TrackTick which
1.35 + // was read, and the associated speex resampler.
1.36 + struct TrackMapEntry {
1.37 + ~TrackMapEntry();
1.38 +
1.39 + /**
1.40 + * Resamples data from all chunks in aIterator and following, using mResampler,
1.41 + * adding the results to mResampledData.
1.42 + */
1.43 + void ResampleInputData(AudioSegment* aSegment);
1.44 + /**
1.45 + * Resamples a set of channel buffers using mResampler, adding the results
1.46 + * to mResampledData.
1.47 + */
1.48 + void ResampleChannels(const nsTArray<const void*>& aBuffers,
1.49 + uint32_t aInputDuration,
1.50 + AudioSampleFormat aFormat,
1.51 + float aVolume);
1.52 +
1.53 + // mEndOfConsumedInputTicks is the end of the input ticks that we've consumed.
1.54 + // 0 if we haven't consumed any yet.
1.55 + TrackTicks mEndOfConsumedInputTicks;
1.56 + // mEndOfLastInputIntervalInInputStream is the timestamp for the end of the
1.57 + // previous interval which was unblocked for both the input and output
1.58 + // stream, in the input stream's timeline, or -1 if there wasn't one.
1.59 + StreamTime mEndOfLastInputIntervalInInputStream;
1.60 + // mEndOfLastInputIntervalInOutputStream is the timestamp for the end of the
1.61 + // previous interval which was unblocked for both the input and output
1.62 + // stream, in the output stream's timeline, or -1 if there wasn't one.
1.63 + StreamTime mEndOfLastInputIntervalInOutputStream;
1.64 + /**
1.65 + * Number of samples passed to the resampler so far.
1.66 + */
1.67 + TrackTicks mSamplesPassedToResampler;
1.68 + /**
1.69 + * Resampler being applied to this track.
1.70 + */
1.71 + SpeexResamplerState* mResampler;
1.72 + /**
1.73 + * The track data that has been resampled to the rate of the
1.74 + * AudioNodeExternalInputStream. All data in these chunks is in floats (or null),
1.75 + * and has the number of channels given in mResamplerChannelCount.
1.76 + * mResampledData starts at zero in the stream's output track (so generally
1.77 + * it will consist of null data followed by actual data).
1.78 + */
1.79 + AudioSegment mResampledData;
1.80 + /**
1.81 + * Number of channels used to create mResampler.
1.82 + */
1.83 + uint32_t mResamplerChannelCount;
1.84 + /**
1.85 + * The ID for the track of the input stream this entry is for.
1.86 + */
1.87 + TrackID mTrackID;
1.88 + };
1.89 +
1.90 + nsTArray<TrackMapEntry> mTrackMap;
1.91 + // Amount of track data produced so far. A multiple of WEBAUDIO_BLOCK_SIZE.
1.92 + TrackTicks mCurrentOutputPosition;
1.93 +
1.94 + /**
1.95 + * Creates a TrackMapEntry for the track, if needed. Returns the index
1.96 + * of the TrackMapEntry or NoIndex if no entry is needed yet.
1.97 + */
1.98 + uint32_t GetTrackMapEntry(const StreamBuffer::Track& aTrack,
1.99 + GraphTime aFrom);
1.100 +};
1.101 +
1.102 +}
1.103 +
1.104 +#endif /* MOZILLA_AUDIONODESTREAM_H_ */
