add audio.get_input_info()

src/audio/AL/ALAudio.cpp

@@ -68,9 +68,17 @@ std::unique_ptr<Speaker> ALSound::newInstance(int priority, int channel) const {
 }
 
 ALInputDevice::ALInputDevice(
-    ALAudio* al, ALCdevice* device, uint channels, uint bitsPerSample
+    ALAudio* al,
+    ALCdevice* device,
+    uint channels,
+    uint bitsPerSample,
+    uint sampleRate
 )
-    : al(al), device(device), channels(channels), bitsPerSample(bitsPerSample) {
+    : al(al),
+      device(device),
+      channels(channels),
+      bitsPerSample(bitsPerSample),
+      sampleRate(sampleRate) {
 }
 
 ALInputDevice::~ALInputDevice() {
@@ -92,6 +100,14 @@ uint ALInputDevice::getChannels() const {
     return channels;
 }
 
+uint ALInputDevice::getSampleRate() const {
+    return sampleRate;
+}
+
+uint ALInputDevice::getBitsPerSample() const {
+    return bitsPerSample;
+}
+
 size_t ALInputDevice::read(char* buffer, size_t bufferSize) {
     ALCint samplesCount = 0;
     alcGetIntegerv(device, ALC_CAPTURE_SAMPLES, sizeof(samplesCount), &samplesCount);
@@ -546,7 +562,7 @@ std::unique_ptr<InputDevice> ALAudio::openInputDevice(
         return nullptr;
 
     return std::make_unique<ALInputDevice>(
-        this, device, channels, bitsPerSample
+        this, device, channels, bitsPerSample, sampleRate
     );
 }
 

src/audio/AL/ALAudio.hpp

@@ -85,7 +85,11 @@ namespace audio {
     class ALInputDevice : public InputDevice {
     public:
         ALInputDevice(
-            ALAudio* al, ALCdevice* device, uint channels, uint bitsPerSample
+            ALAudio* al,
+            ALCdevice* device,
+            uint channels,
+            uint bitsPerSample,
+            uint sampleRate
         );
         ~ALInputDevice() override;
 
@@ -93,6 +97,8 @@ namespace audio {
         void stopCapture() override;
 
         uint getChannels() const override;
+        uint getSampleRate() const override;
+        uint getBitsPerSample() const override;
 
         size_t read(char* buffer, size_t bufferSize) override;
     private:
@@ -100,6 +106,7 @@ namespace audio {
         ALCdevice* device;
         uint channels;
         uint bitsPerSample;
+        uint sampleRate;
     };
 
     /// @brief AL source adapter

src/audio/audio.hpp

@@ -120,6 +120,12 @@ namespace audio {
         /// @brief Get number of audio channels
         /// @return 1 if mono, 2 if stereo
         virtual uint getChannels() const = 0;
+        /// @brief Get audio sampling frequency
+        /// @return number of mono samples per second
+        virtual uint getSampleRate() const = 0;
+        /// @brief Get number of bits per mono sample
+        /// @return 8 or 16
+        virtual uint getBitsPerSample() const = 0;
 
         virtual size_t read(char* buffer, size_t bufferSize) = 0;
     };

src/logic/scripting/lua/libs/libaudio.cpp

@@ -442,6 +442,21 @@ static int l_audio_set_output_device(lua::State* L) {
     return 0;
 }
 
+static int l_audio_get_input_info(lua::State* L) {
+    auto device = audio::get_input_device();
+    if (device == nullptr) {
+        return 0;
+    }
+    lua::createtable(L, 0, 3);
+    lua::pushinteger(L, device->getChannels());
+    lua::setfield(L, "channels");
+    lua::pushinteger(L, device->getSampleRate());
+    lua::setfield(L, "sample_rate");
+    lua::pushinteger(L, device->getBitsPerSample());
+    lua::setfield(L, "bits_per_sample");
+    return 1;
+}
+
 const luaL_Reg audiolib[] = {
     {"play_sound", lua::wrap<l_audio_play_sound>},
     {"play_sound_2d", lua::wrap<l_audio_play_sound_2d>},
@@ -472,5 +487,6 @@ const luaL_Reg audiolib[] = {
     {"get_output_devices_names", lua::wrap<l_audio_get_output_devices_names>},
     {"set_input_device", lua::wrap<l_audio_set_input_device>},
     {"set_output_device", lua::wrap<l_audio_set_output_device>},
+    {"get_input_info", lua::wrap<l_audio_get_input_info>},
     {nullptr, nullptr}
 };