Add device selection to cubeb-test

It's a lot easier to develop/debug device-related features/issues if we
can select input or/and output device for the audio stream in cubeb-test

tools/cubeb-test.cpp

@@ -7,6 +7,7 @@
 #include <cstring>
 #include <inttypes.h>
 #include <iostream>
+#include <vector>
 #ifdef _WIN32
 #include <objbase.h> // Used by CoInitialize()
 #endif
@@ -35,6 +36,32 @@ static const char* state_to_string(cubeb_state state) {
   }
 }
 
+static const char* device_type_to_string(cubeb_device_type type) {
+  switch (type) {
+    case CUBEB_DEVICE_TYPE_INPUT:
+      return "input";
+    case CUBEB_DEVICE_TYPE_OUTPUT:
+      return "output";
+    case CUBEB_DEVICE_TYPE_UNKNOWN:
+      return "unknown";
+    default:
+      assert(false);
+  }
+}
+
+static const char* device_state_to_string(cubeb_device_state state) {
+  switch (state) {
+    case CUBEB_DEVICE_STATE_DISABLED:
+      return "disabled";
+    case CUBEB_DEVICE_STATE_UNPLUGGED:
+      return "unplugged";
+    case CUBEB_DEVICE_STATE_ENABLED:
+      return "enabled";
+    default:
+      assert(false);
+  }
+}
+
 void print_log(const char* msg, ...) {
   va_list args;
   va_start(args, msg);
@@ -48,6 +75,7 @@ class cubeb_client final {
   ~cubeb_client() {}
 
   bool init(char const * backend_name = nullptr);
+  cubeb_devid select_device(cubeb_device_type type) const;
   bool init_stream();
   bool start_stream();
   bool stop_stream();
@@ -70,7 +98,10 @@ class cubeb_client final {
   bool unregister_device_collection_changed(cubeb_device_type devtype) const;
 
   cubeb_stream_params output_params = {};
+  cubeb_devid output_device = nullptr;
+
   cubeb_stream_params input_params = {};
+  cubeb_devid input_device = nullptr;
 
   void force_drain() { _force_drain = true; }
 
@@ -81,8 +112,6 @@ class cubeb_client final {
   cubeb* context = nullptr;
 
   cubeb_stream* stream = nullptr;
-  cubeb_devid output_device = nullptr;
-  cubeb_devid input_device = nullptr;
 
   /* Accessed only from client and audio thread. */
   std::atomic<uint32_t> _rate = {0};
@@ -492,6 +521,56 @@ bool choose_action(cubeb_client& cl, operation_data * op, int c) {
   return true; // Loop up
 }
 
+cubeb_devid cubeb_client::select_device(cubeb_device_type type) const
+{
+  assert(type == CUBEB_DEVICE_TYPE_INPUT || type == CUBEB_DEVICE_TYPE_OUTPUT);
+
+  cubeb_device_collection collection;
+  if (cubeb_enumerate_devices(context, type, &collection) ==
+      CUBEB_ERROR_NOT_SUPPORTED) {
+    fprintf(stderr,
+            "Not support %s device selection. Force to use default device\n",
+            device_type_to_string(type));
+    return nullptr;
+  }
+
+  assert(collection.count);
+  fprintf(stderr, "Found %zu %s devices. Choose one:\n", collection.count,
+          device_type_to_string(type));
+
+  std::vector<cubeb_devid> devices;
+  devices.emplace_back(nullptr);
+  fprintf(stderr, "# 0\n\tname: system default device\n");
+  for (size_t i = 0; i < collection.count; i++) {
+    assert(collection.device[i].type == type);
+    fprintf(stderr,
+            "# %zu %s\n"
+            "\tname: %s\n"
+            "\tdevice id: %s\n"
+            "\tmax channels: %u\n"
+            "\tstate: %s\n",
+            devices.size(),
+            collection.device[i].preferred ? " (PREFERRED)" : "",
+            collection.device[i].friendly_name, collection.device[i].device_id,
+            collection.device[i].max_channels,
+            device_state_to_string(collection.device[i].state));
+    devices.emplace_back(collection.device[i].devid);
+  }
+
+  cubeb_device_collection_destroy(context, &collection);
+
+  size_t number;
+  std::cout << "Enter device number: ";
+  std::cin >> number;
+  while (!std::cin || number >= devices.size()) {
+    std::cin.clear();
+    std::cin.ignore(100, '\n');
+    std::cout << "Error: Please enter a valid numeric input. Enter again: ";
+    std::cin >> number;
+  }
+  return devices[number];
+}
+
 int main(int argc, char* argv[]) {
 #ifdef _WIN32
   CoInitialize(nullptr);
@@ -523,7 +602,7 @@ int main(int argc, char* argv[]) {
 
   bool res = false;
   cubeb_client cl;
-  cl.activate_log(CUBEB_LOG_DISABLED);
+  cl.activate_log(CUBEB_LOG_NORMAL);
   fprintf(stderr, "Log level is DISABLED\n");
   cl.init(/* default backend */);
 
@@ -540,10 +619,12 @@ int main(int argc, char* argv[]) {
     }
   } else {
     if (op.pm == PLAYBACK || op.pm == DUPLEX || op.pm == LATENCY_TESTING) {
+      cl.output_device = cl.select_device(CUBEB_DEVICE_TYPE_OUTPUT);
       cl.output_params = {CUBEB_SAMPLE_FLOAT32NE, op.rate, DEFAULT_OUTPUT_CHANNELS,
                           CUBEB_LAYOUT_STEREO, CUBEB_STREAM_PREF_NONE};
     }
     if (op.pm == RECORD || op.pm == DUPLEX || op.pm == LATENCY_TESTING) {
+      cl.input_device = cl.select_device(CUBEB_DEVICE_TYPE_INPUT);
       cl.input_params = {CUBEB_SAMPLE_FLOAT32NE, op.rate, DEFAULT_INPUT_CHANNELS, CUBEB_LAYOUT_UNDEFINED, CUBEB_STREAM_PREF_NONE};
     }
     if (op.pm == LATENCY_TESTING) {