tests: Add a Makefile for tests

And add a test for the audio device selection feature, added in
GNOME 3.20.

.gitignore

@@ -7,3 +7,4 @@ Makefile
 *.o
 *.gir
 *.typelib
+test-audio-device-selection

Makefile.tests

@@ -0,0 +1,43 @@
+LIBGVC_SOURCES =				\
+	gvc-mixer-card.h			\
+	gvc-mixer-card.c			\
+	gvc-mixer-stream.h			\
+	gvc-mixer-stream.c			\
+	gvc-channel-map.h			\
+	gvc-channel-map.c			\
+	gvc-mixer-ui-device.h			\
+	gvc-mixer-ui-device.c			\
+	gvc-mixer-sink.h			\
+	gvc-mixer-sink.c			\
+	gvc-mixer-source.h			\
+	gvc-mixer-source.c			\
+	gvc-mixer-sink-input.h			\
+	gvc-mixer-sink-input.c			\
+	gvc-mixer-source-output.h		\
+	gvc-mixer-source-output.c		\
+	gvc-mixer-event-role.h			\
+	gvc-mixer-event-role.c			\
+	gvc-mixer-control.h			\
+	gvc-mixer-control.c			\
+	gvc-mixer-card-private.h		\
+	gvc-mixer-stream-private.h		\
+	gvc-channel-map-private.h		\
+	gvc-mixer-control-private.h		\
+	gvc-pulseaudio-fake.h
+
+GVC_CFLAGS = `pkg-config --cflags gtk+-3.0 libpulse libpulse-mainloop-glib alsa`
+GVC_LIBS = `pkg-config --libs gtk+-3.0 libpulse libpulse-mainloop-glib alsa`
+
+all: test-audio-device-selection $(LIBGVC_SOURCES) tests-include/config.h
+
+.c.o:
+	$(CC) -c $(GVC_CFLAGS) -I. -Itests-include/ $< -o $@
+
+C_SOURCES = $(filter %.c,$(LIBGVC_SOURCES))
+OBJECTS=$(C_SOURCES:.c=.o)
+
+test-audio-device-selection: $(OBJECTS) test-audio-device-selection.o
+	$(CC) $(GVC_LIBS) $(OBJECTS) test-audio-device-selection.o -o $@
+
+clean:
+	rm -f *.o test-audio-device-selection

test-audio-device-selection.c

@@ -0,0 +1,62 @@
+
+#include <pulse/pulseaudio.h>
+#include "gvc-mixer-control.h"
+
+typedef struct {
+	GvcHeadsetPortChoice choice;
+	gchar *name;
+} AudioSelectionChoice;
+
+static AudioSelectionChoice audio_selection_choices[] = {
+	{ GVC_HEADSET_PORT_CHOICE_HEADPHONES,   "headphones" },
+	{ GVC_HEADSET_PORT_CHOICE_HEADSET,      "headset" },
+	{ GVC_HEADSET_PORT_CHOICE_MIC,          "microphone" },
+};
+
+static void
+audio_selection_needed (GvcMixerControl      *control,
+			guint                 id,
+			gboolean              show_dialog,
+			GvcHeadsetPortChoice  choices,
+			gpointer              user_data)
+{
+	char *args[G_N_ELEMENTS (audio_selection_choices) + 1];
+	char *choices_str;
+	guint i, n;
+
+	if (!show_dialog) {
+		g_print ("Audio selection not needed anymore for id %d\n", id);
+		return;
+	}
+
+	n = 0;
+	for (i = 0; i < G_N_ELEMENTS (audio_selection_choices); ++i) {
+		if (choices & audio_selection_choices[i].choice)
+			args[n++] = audio_selection_choices[i].name;
+	}
+	args[n] = NULL;
+
+	choices_str = g_strjoinv (", ", args);
+	g_print ("+++ Audio selection needed for id %d\n", id);
+	g_print ("    Choices are: %s\n", choices_str);
+	g_free (choices_str);
+}
+
+int main (int argc, char **argv)
+{
+	GMainLoop *loop;
+	GvcMixerControl *volume;
+
+	loop = g_main_loop_new (NULL, FALSE);
+
+	volume = gvc_mixer_control_new ("GNOME Volume Control test");
+	g_signal_connect (volume,
+			  "audio-device-selection-needed",
+			  G_CALLBACK (audio_selection_needed),
+			  NULL);
+	gvc_mixer_control_open (volume);
+
+	g_main_loop_run (loop);
+
+	return 0;
+}

tests-include/config.h

@@ -0,0 +1,3 @@
+#define GETTEXT_PACKAGE "libgvc-test"
+#define PACKAGE_VERSION "1.0-test"
+#define HAVE_ALSA       1