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#include "captions-mssapi.hpp"
#define do_log(type, format, ...) blog(type, "[Captions] " format, \
##__VA_ARGS__)
#define error(format, ...) do_log(LOG_ERROR, format, ##__VA_ARGS__)
#define debug(format, ...) do_log(LOG_DEBUG, format, ##__VA_ARGS__)
mssapi_captions::mssapi_captions(
captions_cb callback,
const std::string &lang) try
: captions_handler(callback, AUDIO_FORMAT_16BIT, 16000)
{
HRESULT hr;
std::wstring wlang;
wlang.resize(lang.size());
for (size_t i = 0; i < lang.size(); i++)
wlang[i] = (wchar_t)lang[i];
LCID lang_id = LocaleNameToLCID(wlang.c_str(), 0);
wchar_t lang_str[32];
_snwprintf(lang_str, 31, L"language=%x", (int)lang_id);
stop = CreateEvent(nullptr, false, false, nullptr);
if (!stop.Valid())
throw "Failed to create event";
hr = SpFindBestToken(SPCAT_RECOGNIZERS, lang_str, nullptr, &token);
if (FAILED(hr))
throw HRError("SpFindBestToken failed", hr);
hr = CoCreateInstance(CLSID_SpInprocRecognizer, nullptr, CLSCTX_ALL,
__uuidof(ISpRecognizer), (void**)&recognizer);
if (FAILED(hr))
throw HRError("CoCreateInstance for recognizer failed", hr);
hr = recognizer->SetRecognizer(token);
if (FAILED(hr))
throw HRError("SetRecognizer failed", hr);
hr = recognizer->SetRecoState(SPRST_INACTIVE);
if (FAILED(hr))
throw HRError("SetRecoState(SPRST_INACTIVE) failed", hr);
hr = recognizer->CreateRecoContext(&context);
if (FAILED(hr))
throw HRError("CreateRecoContext failed", hr);
ULONGLONG interest = SPFEI(SPEI_RECOGNITION) |
SPFEI(SPEI_END_SR_STREAM);
hr = context->SetInterest(interest, interest);
if (FAILED(hr))
throw HRError("SetInterest failed", hr);
hr = context->SetNotifyWin32Event();
if (FAILED(hr))
throw HRError("SetNotifyWin32Event", hr);
notify = context->GetNotifyEventHandle();
if (notify == INVALID_HANDLE_VALUE)
throw HRError("GetNotifyEventHandle failed", E_NOINTERFACE);
size_t sample_rate = audio_output_get_sample_rate(obs_get_audio());
audio = new CaptionStream((DWORD)sample_rate, this);
audio->Release();
hr = recognizer->SetInput(audio, false);
if (FAILED(hr))
throw HRError("SetInput failed", hr);
hr = context->CreateGrammar(1, &grammar);
if (FAILED(hr))
throw HRError("CreateGrammar failed", hr);
hr = grammar->LoadDictation(nullptr, SPLO_STATIC);
if (FAILED(hr))
throw HRError("LoadDictation failed", hr);
try {
t = std::thread([this] () {main_thread();});
} catch (...) {
throw "Failed to create thread";
}
} catch (const char *err) {
blog(LOG_WARNING, "%s: %s", __FUNCTION__, err);
throw CAPTIONS_ERROR_GENERIC_FAIL;
} catch (HRError err) {
blog(LOG_WARNING, "%s: %s (%lX)", __FUNCTION__, err.str, err.hr);
throw CAPTIONS_ERROR_GENERIC_FAIL;
}
mssapi_captions::~mssapi_captions()
{
if (t.joinable()) {
SetEvent(stop);
t.join();
}
}
void mssapi_captions::main_thread()
try {
HRESULT hr;
os_set_thread_name(__FUNCTION__);
hr = grammar->SetDictationState(SPRS_ACTIVE);
if (FAILED(hr))
throw HRError("SetDictationState failed", hr);
hr = recognizer->SetRecoState(SPRST_ACTIVE);
if (FAILED(hr))
throw HRError("SetRecoState(SPRST_ACTIVE) failed", hr);
HANDLE events[] = {notify, stop};
started = true;
for (;;) {
DWORD ret = WaitForMultipleObjects(2, events, false, INFINITE);
if (ret != WAIT_OBJECT_0)
break;
CSpEvent event;
bool exit = false;
while (event.GetFrom(context) == S_OK) {
if (event.eEventId == SPEI_RECOGNITION) {
ISpRecoResult *result = event.RecoResult();
CoTaskMemPtr<wchar_t> text;
hr = result->GetText((ULONG)-1, (ULONG)-1,
true, &text, nullptr);
if (FAILED(hr))
continue;
char text_utf8[512];
os_wcs_to_utf8(text, 0, text_utf8, 512);
callback(text_utf8);
blog(LOG_DEBUG, "\"%s\"", text_utf8);
} else if (event.eEventId == SPEI_END_SR_STREAM) {
exit = true;
break;
}
}
if (exit)
break;
}
audio->Stop();
} catch (HRError err) {
blog(LOG_WARNING, "%s failed: %s (%lX)", __FUNCTION__, err.str, err.hr);
}
void mssapi_captions::pcm_data(const void *data, size_t frames)
{
if (started)
audio->PushAudio(data, frames);
}
captions_handler_info mssapi_info = {
[] () -> std::string
{
return "Microsoft Speech-to-Text";
},
[] (captions_cb cb, const std::string &lang) -> captions_handler *
{
return new mssapi_captions(cb, lang);
}
};
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