In my attempts to troubleshoot a challenging SpeechRecognizer.java issue, I noticed in Logcat messages TAGs that are not SpeechRecognizer's:
12:34:00.933 NetworkSpeechRecognizer pid-29210 I Online recognizer - start listening
12:34:00.936 SodaSpeechRecognizer pid-29210 I Offline recognizer - start listening
12:34:00.936 SodaSpeechRecognizer I Initialize Soda [locale: en-US]
12:34:00.963 SodaSpeechRecognizer I Initialize Soda with language pack directory
12:34:01.099 SodaSpeechRecognizer I Offline recognizer - start detection
12:34:02.975 NetworkSpeechRecognizer I #cancel
12:34:02.976 NetworkSpeechRecognizer pid-29210 I #cancel
12:34:02.976 NetworkSpeechRecognizer I #failWithException
12:34:02.977 SodaSpeechRecognizer I startDetection successful
12:34:02.979 NetworkSpeechRecognizer W Recognizer network error
12:34:02.979 SodaSpeechRecognizer I Offline recognizer - stop detection
What is SodaSpeechRecognizer?
Where can I learn more about it?
How are these tags generated if SpeechRecognizer.java only defines:
private static final String TAG = "SpeechRecognizer";
Update: I just found this article SODA: Speech On-Device API along with this page. Nice clue, but insufficient as this is not official documentation.
The following official documentation from Google seems to be much better: https://cloud.google.com/speech-to-text/priv/docs/ondevice-overview
Yet, it is still mysterious, quoting:
This product is a private feature. The documentation is publicly available but you must contact Google for full access.
Attempting to answer my questions (until a better answer comes along):
SodaSpeechRecognizer is the on-device speech recognizer (SODA is an acronym for "Speech On-Device API"). It is unclear yet when it was introduced. Could this be with the introduction of com.google.android.googlequicksearchbox(Android 4.1 AKA "Jelly Bean", released in June 2012)?C++ module name soda_async_impl.cc, as it is the only one visible on Logcat that produces SODA related messages:
native W W0206 12:01:28.459973 32167 soda_async_impl.cc:320] Creating soda_impl.
W W0206 12:01:28.460534 32167 soda_async_impl.cc:322] Created with thread priority 10
native W W0206 12:01:29.632099 32167 soda_async_impl.cc:484] SODA session starting (require_hotword:0, hotword_timeout_in_millis:0, trigger_type:TRIGGER_TYPE_UNSPECIFIED, hybrid_asr_config.mode:MODE_DEFAULT)
native W W0206 12:01:29.634873 32200 soda_async_impl.cc:1203] SODA received first mic audio buffer, size in bytes: 320, format: 1, channels: 1, : sample rate: 16000
native W W0206 12:01:30.154026 32200 soda_async_impl.cc:959] Not receiving any loopback audio in 500ms. Last audio received time: 0, Current time in us: 1675677690154022
native W W0206 12:01:33.162399 32200 soda_async_impl.cc:861] SODA stopped processing audio, mics audio processed in millis: 4880, loopback audio processed in millis: 0
W W0206 12:01:33.265670 32200 soda_async_impl.cc:916] SODA session stopped due to: MIC_END_OF_DATA
W W0206 12:01:33.319812 32171 soda_async_impl.cc:987] Deleting soda_impl