1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 syntax = "proto2"; 6 option optimize_for = LITE_RUNTIME; 7 8 // TODO(hans): Commented out due to compilation errors. 9 // option cc_api_version = 2; 10 11 package content.proto; 12 13 // SpeechRecognitionEvent is the only message type sent to client. 14 // 15 // The first SpeechRecognitionEvent is an empty (default) message to indicate 16 // as early as possible that the stream connection has been established. 17 message SpeechRecognitionEvent { 18 enum StatusCode { 19 // Note: in JavaScript API SpeechRecognitionError 0 is "OTHER" error. 20 STATUS_SUCCESS = 0; 21 STATUS_NO_SPEECH = 1; 22 STATUS_ABORTED = 2; 23 STATUS_AUDIO_CAPTURE = 3; 24 STATUS_NETWORK = 4; 25 STATUS_NOT_ALLOWED = 5; 26 STATUS_SERVICE_NOT_ALLOWED = 6; 27 STATUS_BAD_GRAMMAR = 7; 28 STATUS_LANGUAGE_NOT_SUPPORTED = 8; 29 } 30 optional StatusCode status = 1 [default = STATUS_SUCCESS]; 31 32 // May contain zero or one final=true result (the newly settled portion). 33 // May also contain zero or more final=false results. 34 // (Note that this differs from JavaScript API resultHistory in that no more 35 // than one final=true result is returned, so client must accumulate 36 // resultHistory by concatenating the final=true results.) 37 repeated SpeechRecognitionResult result = 2; 38 }; 39 40 message SpeechRecognitionResult { 41 repeated SpeechRecognitionAlternative alternative = 1; 42 43 // True if this is the final time the speech service will return this 44 // particular SpeechRecognitionResult. If false, then this represents an 45 // interim result that could still be changed. 46 optional bool final = 2 [default = false]; 47 48 // An estimate of the probability that the recognizer will not change its 49 // guess about this interim result. Values range from 0.0 (completely 50 // unstable) to 1.0 (completely stable). Note that this is not the same as 51 // "confidence", which estimate the probability that a recognition result 52 // is correct. This field is only provided for interim (final=false) results. 53 optional float stability = 3; 54 }; 55 56 // Item in N-best list. 57 message SpeechRecognitionAlternative { 58 // Spoken text. 59 optional string transcript = 1; 60 61 // The confidence estimate between 0.0 and 1.0. A higher number means the 62 // system is more confident that the recognition is correct. 63 // This field is typically provided only for the top hypothesis and only for 64 // final results. 65 optional float confidence = 2; 66 } 67
