move portaudio common record code to microphone (#2264)

Co-authored-by: cqm <cqm@97kid.com>

sherpa-onnx/csrc/microphone.cc

@@ -7,8 +7,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-#include "portaudio.h"  // NOLINT
-
 namespace sherpa_onnx {
 
 Microphone::Microphone() {
@@ -20,10 +18,85 @@ Microphone::Microphone() {
 }
 
 Microphone::~Microphone() {
+  CloseDevice();
   PaError err = Pa_Terminate();
   if (err != paNoError) {
     fprintf(stderr, "portaudio error: %s\n", Pa_GetErrorText(err));
-    exit(-1);
+  }
+}
+
+int Microphone::GetDeviceCount() const {
+  return Pa_GetDeviceCount();
+}
+
+int Microphone::GetDefaultInputDevice() const {
+  return Pa_GetDefaultInputDevice();
+}
+
+void Microphone::PrintDevices(int device_index) const {
+  PaDeviceIndex num_devices = Pa_GetDeviceCount();
+  fprintf(stderr, "Num devices: %d\n", num_devices);
+  for (int32_t i = 0; i != num_devices; ++i) {
+    const PaDeviceInfo *info = Pa_GetDeviceInfo(i);
+    fprintf(stderr, " %s %d %s\n", (i == device_index) ? "*" : " ", i,
+            info->name);
+  }
+}
+
+bool Microphone::OpenDevice(int index, int sample_rate, int channel, PaStreamCallback cb, void* userdata) {
+  if (index < 0 || index >= Pa_GetDeviceCount()) {
+    fprintf(stderr, "Invalid device index: %d\n", index);
+    return false;
+  }
+
+  const PaDeviceInfo *info = Pa_GetDeviceInfo(index);
+  if (!info) {
+    fprintf(stderr, "No device info found for index: %d\n", index);
+    return false;
+  }
+
+  CloseDevice();
+
+  fprintf(stderr, "Use device: %d\n", index);
+  fprintf(stderr, "  Name: %s\n", info->name);
+  fprintf(stderr, "  Max input channels: %d\n", info->maxInputChannels);
+
+  PaStreamParameters param;
+  param.device = index;
+  param.channelCount = channel;
+  param.sampleFormat = paFloat32;
+  param.suggestedLatency = info->defaultLowInputLatency;
+  param.hostApiSpecificStreamInfo = nullptr;
+
+  PaError err = Pa_OpenStream(&stream, &param, nullptr, /* &outputParameters, */
+                    sample_rate,
+                    0,          // frames per buffer
+                    paClipOff,  // we won't output out of range samples
+                                // so don't bother clipping them
+                    cb, userdata);
+  if (err != paNoError) {
+    fprintf(stderr, "portaudio error: %s\n", Pa_GetErrorText(err));
+    return false;
+  }
+
+  err = Pa_StartStream(stream);
+  fprintf(stderr, "Started\n");
+
+  if (err != paNoError) {
+    fprintf(stderr, "portaudio error: %s\n", Pa_GetErrorText(err));
+    CloseDevice();
+    return false;
+  }
+  return true;
+}
+
+void Microphone::CloseDevice() {
+  if (stream) {
+    PaError err = Pa_CloseStream(stream);
+    if (err != paNoError) {
+      fprintf(stderr, "Pa_CloseStream error: %s\n", Pa_GetErrorText(err));
+    }
+    stream = nullptr;
   }
 }