The Tor Browser: content/media/AudioNodeExternalInputStream.h@44a2da4a2ab2

Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32

     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/. */

     6 #ifndef MOZILLA_AUDIONODEEXTERNALINPUTSTREAM_H_

     7 #define MOZILLA_AUDIONODEEXTERNALINPUTSTREAM_H_

     9 #include "MediaStreamGraph.h"

    10 #include "AudioNodeStream.h"

    12 // Forward declaration for mResamplerMap

    13 typedef struct SpeexResamplerState_ SpeexResamplerState;

    15 namespace mozilla {

    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();

    28   virtual void ProcessInput(GraphTime aFrom, GraphTime aTo, uint32_t aFlags) MOZ_OVERRIDE;

    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();

    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);

    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   };

    87   nsTArray<TrackMapEntry> mTrackMap;

    88   // Amount of track data produced so far. A multiple of WEBAUDIO_BLOCK_SIZE.

    89   TrackTicks mCurrentOutputPosition;

    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 };

    99 }

   101 #endif /* MOZILLA_AUDIONODESTREAM_H_ */

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