win-dshow: Add audio output mode options

This allows the ability to output the audio of the device as desktop
audio (via the WaveOut or DirectSound audio renderers) instead of
capturing the audio only.

In the future, we'll implement audio monitoring which will make this
feature obsolete, but for the time being I decided to add this option as
a temporary measure to allow users to play the audio from their devices
via the DirectShow output.

plugins/win-dshow/data/locale/en-US.ini

@@ -18,6 +18,10 @@ Resolution="Resolution"
 VideoFormat="Video Format"
 VideoFormat.Any="Any"
 VideoFormat.Unknown="Unknown (%1)"
+AudioOutputMode="Audio Output Mode"
+AudioOutputMode.Capture="Capture audio only"
+AudioOutputMode.DirectSound="Output desktop audio (DirectSound)"
+AudioOutputMode.WaveOut="Output desktop audio (WaveOut)"
 UseCustomAudioDevice="Use custom audio device"
 AudioDevice="Audio Device"
 Buffering="Buffering"

plugins/win-dshow/win-dshow.cpp

@@ -38,6 +38,7 @@ using namespace DShow;
 #define LAST_RESOLUTION   "last_resolution"
 #define BUFFERING_VAL     "buffering"
 #define FLIP_IMAGE        "flip_vertically"
+#define AUDIO_OUTPUT_MODE "audio_output_mode"
 #define USE_CUSTOM_AUDIO  "use_custom_audio_device"
 #define AUDIO_DEVICE_ID   "audio_device_id"
 #define COLOR_SPACE       "color_space"
@@ -60,6 +61,10 @@ using namespace DShow;
 #define TEXT_BUFFERING_ON   obs_module_text("Buffering.Enable")
 #define TEXT_BUFFERING_OFF  obs_module_text("Buffering.Disable")
 #define TEXT_FLIP_IMAGE     obs_module_text("FlipVertically")
+#define TEXT_AUDIO_MODE     obs_module_text("AudioOutputMode")
+#define TEXT_MODE_CAPTURE   obs_module_text("AudioOutputMode.Capture")
+#define TEXT_MODE_DSOUND    obs_module_text("AudioOutputMode.DirectSound")
+#define TEXT_MODE_WAVEOUT   obs_module_text("AudioOutputMode.WaveOut")
 #define TEXT_CUSTOM_AUDIO   obs_module_text("UseCustomAudioDevice")
 #define TEXT_AUDIO_DEVICE   obs_module_text("AudioDevice")
 #define TEXT_ACTIVATE       obs_module_text("Activate")
@@ -840,6 +845,9 @@ bool DShowInput::UpdateAudioConfig(obs_data_t *settings)
 			placeholders::_3, placeholders::_4,
 			placeholders::_5);
 
+	audioConfig.mode =
+		(AudioMode)obs_data_get_int(settings, AUDIO_OUTPUT_MODE);
+
 	return device.SetAudioConfig(&audioConfig);
 }
 
@@ -960,6 +968,8 @@ static void GetDShowDefaults(obs_data_t *settings)
 	obs_data_set_default_bool(settings, "active", true);
 	obs_data_set_default_string(settings, COLOR_SPACE, "default");
 	obs_data_set_default_string(settings, COLOR_RANGE, "partial");
+	obs_data_set_default_int(settings, AUDIO_OUTPUT_MODE,
+			(int)AudioMode::Capture);
 }
 
 struct Resolution {
@@ -1704,6 +1714,15 @@ static obs_properties_t *GetDShowProperties(void *obj)
 	if (!data->audioDevices.size())
 		return ppts;
 
+	p = obs_properties_add_list(ppts, AUDIO_OUTPUT_MODE, TEXT_AUDIO_MODE,
+			OBS_COMBO_TYPE_LIST, OBS_COMBO_FORMAT_INT);
+	obs_property_list_add_int(p, TEXT_MODE_CAPTURE,
+			(int64_t)AudioMode::Capture);
+	obs_property_list_add_int(p, TEXT_MODE_DSOUND,
+			(int64_t)AudioMode::DirectSound);
+	obs_property_list_add_int(p, TEXT_MODE_WAVEOUT,
+			(int64_t)AudioMode::WaveOut);
+
 	p = obs_properties_add_bool(ppts, USE_CUSTOM_AUDIO, TEXT_CUSTOM_AUDIO);
 
 	obs_property_set_modified_callback(p, CustomAudioClicked);