Add sound capture

tests/renderer-smoke-test.c

@@ -114,6 +114,7 @@ int main(int argc, char **argv)
 				"background:rgb(241,23,17)}";
 	const char *url = external_url ? argv[3] : internal_url;
 	const char *css = external_url ? "" : zoom ? zoom_css : opaque ? opaque_css : transparent_css;
+	const char *audio_sink = getenv("OWB_TEST_AUDIO_SINK");
 	struct owb_config_header config = {
 		.magic = OWB_CONFIG_MAGIC,
 		.version = OWB_PROTOCOL_VERSION,
@@ -121,12 +122,15 @@ int main(int argc, char **argv)
 		.height = height,
 		.fps = 10,
 		.zoom_percent = zoom ? 200 : 100,
+		.capture_audio = audio_sink && *audio_sink,
 		.transparent = opaque ? 0 : 1,
 		/* GPU rendering must still produce an invisible captured frame. */
 		.hardware_acceleration = 1,
 		.url_length = (uint32_t)strlen(url),
 		.css_length = (uint32_t)strlen(css),
 	};
+	if (audio_sink)
+		snprintf(config.audio_sink, sizeof(config.audio_sink), "%s", audio_sink);
 	bool sent = write_exact(control[0], &config, sizeof(config)) &&
 		    write_exact(control[0], url, strlen(url)) &&
 		    write_exact(control[0], css, strlen(css));