pulse-server: fill volumes and state

src/modules/module-protocol-pulse/volume.c

@@ -0,0 +1,85 @@
+/* PipeWire
+ *
+ * Copyright © 2020 Wim Taymans
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+struct volume {
+	uint8_t channels;
+	float values[CHANNELS_MAX];
+};
+
+#define VOLUME_INIT	(struct volume) {		\
+				.channels = 2,		\
+				.values[0] = 1.0f,	\
+				.values[1] = 1.0f,	\
+			}
+
+struct volume_info {
+	struct volume volume;
+	bool mute;
+	float level;
+	float base;
+	uint32_t steps;
+};
+
+#define VOLUME_INFO_INIT	(struct volume_info) {		\
+					.volume = VOLUME_INIT,	\
+					.mute = false,		\
+					.level = 1.0,		\
+					.base = 1.0,		\
+					.steps = 256,		\
+				}
+
+
+static int volume_parse_param(const struct spa_pod *param, struct volume_info *info)
+{
+	struct spa_pod_object *obj = (struct spa_pod_object *) param;
+	struct spa_pod_prop *prop;
+
+	SPA_POD_OBJECT_FOREACH(obj, prop) {
+		switch (prop->key) {
+		case SPA_PROP_volume:
+			spa_pod_get_float(&prop->value, &info->level);
+			break;
+		case SPA_PROP_mute:
+			spa_pod_get_bool(&prop->value, &info->mute);
+			break;
+		case SPA_PROP_channelVolumes:
+			info->volume.channels = spa_pod_copy_array(&prop->value, SPA_TYPE_Float,
+					info->volume.values, SPA_AUDIO_MAX_CHANNELS);
+			break;
+		case SPA_PROP_volumeBase:
+			spa_pod_get_float(&prop->value, &info->base);
+			break;
+		case SPA_PROP_volumeStep:
+		{
+			float step;
+			if (spa_pod_get_float(&prop->value, &step) >= 0)
+				info->steps = 0x10000u * step;
+			break;
+		}
+		default:
+			break;
+		}
+	}
+	return 0;
+}