Chromium speech recognition details

gistfile1.cpp

const int SpeechRecognizer::kAudioSampleRate = 16000;
const int SpeechRecognizer::kAudioPacketIntervalMs = 100;
const ChannelLayout SpeechRecognizer::kChannelLayout = CHANNEL_LAYOUT_MONO;
const int SpeechRecognizer::kNumBitsPerAudioSample = 16;
const int SpeechRecognizer::kNoSpeechTimeoutSec = 8;
const int SpeechRecognizer::kEndpointerEstimationTimeMs = 300;
// ...
const char* const kContentTypeSpeex = "audio/x-speex-with-header-byte; rate=";
const int kSpeexEncodingQuality = 8;
const int kMaxSpeexFrameLength = 110;  // (44kbps rate sampled at 32kHz).
// ...
const char* const kContentTypeFLAC = "audio/x-flac; rate=";
const int kFLACCompressionLevel = 0;  // 0 for speed