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/*
*
* Copyright 2017, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#import "SpeechRecognitionService.h"
#import <GRPCClient/GRPCCall.h>
#import <ProtoRPC/ProtoRPC.h>
#import "CBDefines.h"
#import "google/cloud/speech/v1/CloudSpeech.pbrpc.h"
#define HOST @"speech.googleapis.com"
@implementation SpeechRecognitionService
+ (instancetype)sharedInstance {
static SpeechRecognitionService *instance = nil;
if (!instance) {
instance = [[self alloc] init];
}
return instance;
}
- (void)processAudioData:(NSData *)audioData
withCompletion:(SpeechRecognitionCompletionHandler)completion {
NSAssert(![CBApiKey isEqualToString:@"your google api key"],
@"Get Google API key: https://cloud.google.com/storage/docs/json_api/v1/how-tos/authorizing#APIKey");
// construct a request for synchronous speech recognition
RecognitionConfig *recognitionConfig = [RecognitionConfig message];
recognitionConfig.encoding = RecognitionConfig_AudioEncoding_Linear16;
recognitionConfig.sampleRateHertz = 16000;
recognitionConfig.languageCode = CBLanguage;
recognitionConfig.maxAlternatives = 1;
RecognitionAudio *recognitionAudio = [RecognitionAudio message];
recognitionAudio.content = audioData;
RecognizeRequest *syncRecognizeRequest = [RecognizeRequest message];
syncRecognizeRequest.config = recognitionConfig;
syncRecognizeRequest.audio = recognitionAudio;
Speech *client = [[Speech alloc] initWithHost:HOST];
// prepare a single gRPC call to make the request
GRPCProtoCall *call = [client
RPCToRecognizeWithRequest:syncRecognizeRequest
handler:^(RecognizeResponse *response, NSError *error) {
NSLog(@"RESPONSE RECEIVED %@", response);
if (error) {
NSLog(@"ERROR: %@", error);
completion([error description]);
} else {
for (SpeechRecognitionResult *result in response.resultsArray) {
NSLog(@"RESULT");
for (SpeechRecognitionAlternative *alternative in result
.alternativesArray) {
NSLog(@"ALTERNATIVE %0.4f %@",
alternative.confidence,
alternative.transcript);
}
}
completion(response);
}
}];
// authenticate using an API key obtained from the Google Cloud Console
call.requestHeaders[@"X-Goog-Api-Key"] = CBApiKey;
// if the API key has a bundle ID restriction, specify the bundle ID like this
call.requestHeaders[@"X-Ios-Bundle-Identifier"] = [[NSBundle mainBundle] bundleIdentifier];
NSLog(@"HEADERS: %@", call.requestHeaders);
// perform the gRPC request
[call start];
}
@end
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