endpoint.cc
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// sherpa-onnx/csrc/endpoint.cc
//
// Copyright (c) 2022 (authors: Pingfeng Luo)
// 2022-2023 Xiaomi Corporation
#include "sherpa-onnx/csrc/endpoint.h"
#include <string>
#include "sherpa-onnx/csrc/log.h"
#include "sherpa-onnx/csrc/parse-options.h"
namespace sherpa_onnx {
static bool RuleActivated(const EndpointRule &rule,
const std::string &rule_name, float trailing_silence,
float utterance_length) {
bool contain_nonsilence = utterance_length > trailing_silence;
bool ans = (contain_nonsilence || !rule.must_contain_nonsilence) &&
trailing_silence >= rule.min_trailing_silence &&
utterance_length >= rule.min_utterance_length;
if (ans) {
SHERPA_ONNX_LOG(DEBUG) << "Endpointing rule " << rule_name << " activated: "
<< (contain_nonsilence ? "true" : "false") << ','
<< trailing_silence << ',' << utterance_length;
}
return ans;
}
static void RegisterEndpointRule(ParseOptions *po, EndpointRule *rule,
const std::string &rule_name) {
po->Register(
rule_name + "-must-contain-nonsilence", &rule->must_contain_nonsilence,
"If True, for this endpointing " + rule_name +
" to apply there must be nonsilence in the best-path traceback. "
"For decoding, a non-blank token is considered as non-silence");
po->Register(rule_name + "-min-trailing-silence", &rule->min_trailing_silence,
"This endpointing " + rule_name +
" requires duration of trailing silence in seconds) to "
"be >= this value.");
po->Register(rule_name + "-min-utterance-length", &rule->min_utterance_length,
"This endpointing " + rule_name +
" requires utterance-length (in seconds) to be >= this "
"value.");
}
std::string EndpointRule::ToString() const {
std::ostringstream os;
os << "EndpointRule(";
os << "must_contain_nonsilence="
<< (must_contain_nonsilence ? "True" : "False") << ", ";
os << "min_trailing_silence=" << min_trailing_silence << ", ";
os << "min_utterance_length=" << min_utterance_length << ")";
return os.str();
}
void EndpointConfig::Register(ParseOptions *po) {
RegisterEndpointRule(po, &rule1, "rule1");
RegisterEndpointRule(po, &rule2, "rule2");
RegisterEndpointRule(po, &rule3, "rule3");
}
std::string EndpointConfig::ToString() const {
std::ostringstream os;
os << "EndpointConfig(";
os << "rule1=" << rule1.ToString() << ", ";
os << "rule2=" << rule2.ToString() << ", ";
os << "rule3=" << rule3.ToString() << ")";
return os.str();
}
bool Endpoint::IsEndpoint(int num_frames_decoded, int trailing_silence_frames,
float frame_shift_in_seconds) const {
float utterance_length = num_frames_decoded * frame_shift_in_seconds;
float trailing_silence = trailing_silence_frames * frame_shift_in_seconds;
if (RuleActivated(config_.rule1, "rule1", trailing_silence,
utterance_length) ||
RuleActivated(config_.rule2, "rule2", trailing_silence,
utterance_length) ||
RuleActivated(config_.rule3, "rule3", trailing_silence,
utterance_length)) {
return true;
}
return false;
}
} // namespace sherpa_onnx