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portaudio_example.cpp
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/**
* Copyright 2017 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <iostream>
#include <apiai/AI.h>
#include <apiai/query/VoiceRequest.h>
#include <portaudio.h>
using namespace ai::query::request;
using namespace ai::query::response;
typedef struct _RecordInfo {
PaTime start_record_time;
VoiceRecorder *recorder;
} RecordInfo;
static int MyPaStreamCallback(
const void *input, void *output,
unsigned long frameCount,
const PaStreamCallbackTimeInfo* timeInfo,
PaStreamCallbackFlags statusFlags,
void *userData )
{
RecordInfo* info = (RecordInfo *)userData;
if (info->start_record_time < 0.0) {
info->start_record_time = timeInfo->currentTime;
}
info->recorder->write((const char *)input, frameCount *sizeof(short));
if (timeInfo->currentTime - info->start_record_time > 3) {
return paComplete;
}
return paContinue;
}
int main(int argc, char *argv[]) {
Pa_Initialize();
ai::AI::global_init();
auto default_input_device = Pa_GetDefaultInputDevice();
auto device_info = Pa_GetDeviceInfo(default_input_device);
PaStreamParameters stream_parameters = {
.device = default_input_device,
.channelCount = 1,
.sampleFormat = paInt16,
.suggestedLatency = 0.0,
.hostApiSpecificStreamInfo = NULL
};
auto error = Pa_IsFormatSupported(&stream_parameters, NULL, 16000.0);
if (error != paNoError) {
return -1;
}
auto credentials = ai::Credentials("ff98c090685f484caaffada53cdce7b3");
auto params = Parameters("<session id unique for every user>");
VoiceRequest request("en", credentials, params);
request.setVoiceSource([stream_parameters](ai::query::request::VoiceRecorder *recorder){
PaStream* stream = NULL;
RecordInfo info = {0};
info.start_record_time = -1;
info.recorder = recorder;
auto open_error =
Pa_OpenStream(&stream,
&stream_parameters,
NULL,
16000.0,
512,
paNoFlag,
MyPaStreamCallback,
&info);
auto start_error = Pa_StartStream(stream);
PaError err = paNoError;
while( ( err = Pa_IsStreamActive( stream ) ) == 1 )
{
Pa_Sleep(1000);
}
delete recorder;
});
auto response = request.perform();
std::cout << response << std::endl;
ai::AI::global_clean();
Pa_Terminate();
return 0;
}