Source/WebCore/Modules/speech/cocoa/SpeechRecognizerCocoa.mm

/*
 * Copyright (C) 2020 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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#import "config.h"
#import "SpeechRecognizer.h"

#if HAVE(SPEECHRECOGNIZER)

#import "AudioStreamDescription.h"
#import "MediaUtilities.h"
#import "SpeechRecognitionUpdate.h"
#import "WebSpeechRecognizerTaskMock.h"
#import <Speech/Speech.h>
#import <pal/avfoundation/MediaTimeAVFoundation.h>
#import <pal/cf/CoreMediaSoftLink.h>

namespace WebCore {

void SpeechRecognizer::dataCaptured(const MediaTime&, const PlatformAudioData& data, const AudioStreamDescription& description, size_t sampleCount)
{
    auto buffer = createAudioSampleBuffer(data, description, m_currentAudioSampleTime, sampleCount);
    [m_task audioSamplesAvailable:buffer.get()];
    m_currentAudioSampleTime = PAL::CMTimeAdd(m_currentAudioSampleTime, PAL::toCMTime(MediaTime(sampleCount, description.sampleRate())));
}

bool SpeechRecognizer::startRecognition(bool mockSpeechRecognitionEnabled, SpeechRecognitionConnectionClientIdentifier identifier, const String& localeIdentifier, bool continuous, bool interimResults, uint64_t alternatives)
{
    auto taskClass = mockSpeechRecognitionEnabled ? [WebSpeechRecognizerTaskMock class] : [WebSpeechRecognizerTask class];
    m_task = adoptNS([[taskClass alloc] initWithIdentifier:identifier locale:localeIdentifier doMultipleRecognitions:continuous reportInterimResults:interimResults maxAlternatives:alternatives delegateCallback:[weakThis = WeakPtr { *this }](const WebCore::SpeechRecognitionUpdate& update) {
        if (weakThis)
            weakThis->m_delegateCallback(update);
    }]);

    return !!m_task;
}

void SpeechRecognizer::stopRecognition()
{
    ASSERT(m_task);
    [m_task stop];
}

void SpeechRecognizer::abortRecognition()
{
    ASSERT(m_task);
    [m_task abort];
}

} // namespace WebCore

#endif // HAVE(SPEECHRECOGNIZER)