format: make helper function to parse media type

spa/include/spa/param/audio/format-utils.h

@@ -26,7 +26,9 @@ extern "C" {
 
 
 #include <spa/pod/parser.h>
+#include <spa/pod/builder.h>
 #include <spa/param/audio/format.h>
+#include <spa/param/format-utils.h>
 
 static inline int
 spa_format_audio_raw_parse(const struct spa_pod *format, struct spa_audio_info_raw *info)
@@ -40,6 +42,19 @@ spa_format_audio_raw_parse(const struct spa_pod *format, struct spa_audio_info_r
 		":", SPA_FORMAT_AUDIO_channelMask,	"?i", &info->channel_mask, NULL);
 }
 
+static inline struct spa_pod *
+spa_format_audio_raw_build(struct spa_pod_builder *builder, uint32_t id, struct spa_audio_info_raw *info)
+{
+	return spa_pod_builder_object(builder,
+                        SPA_TYPE_OBJECT_Format, id,
+                        "I", SPA_MEDIA_TYPE_audio,
+                        "I", SPA_MEDIA_SUBTYPE_raw,
+                        ":", SPA_FORMAT_AUDIO_format,   "I", info->format,
+                        ":", SPA_FORMAT_AUDIO_layout,   "I", info->layout,
+                        ":", SPA_FORMAT_AUDIO_rate,     "i", info->rate,
+                        ":", SPA_FORMAT_AUDIO_channels, "i", info->channels);
+}
+
 #ifdef __cplusplus
 }  /* extern "C" */
 #endif

spa/include/spa/param/format-utils.h

@@ -0,0 +1,43 @@
+/* Simple Plugin API
+ * Copyright (C) 2016 Wim Taymans <wim.taymans@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __SPA_PARAM_FORMAT_UTILS_H__
+#define __SPA_PARAM_FORMAT_UTILS_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#include <spa/pod/parser.h>
+#include <spa/param/format.h>
+
+static inline int
+spa_format_parse(const struct spa_pod *format, uint32_t *media_type, uint32_t *media_subtype)
+{
+	return spa_pod_object_parse(format,
+		"I", media_type,
+		"I", media_subtype, NULL);
+}
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif
+
+#endif /* __SPA_PARAM_FORMAT_UTILS */

spa/include/spa/param/format.h

@@ -28,6 +28,7 @@ extern "C" {
 
 /** media type for SPA_TYPE_OBJECT_Format */
 enum spa_media_type {
+	SPA_MEDIA_TYPE_START,
 	SPA_MEDIA_TYPE_audio,
 	SPA_MEDIA_TYPE_video,
 	SPA_MEDIA_TYPE_image,

spa/include/spa/param/video/format-utils.h

@@ -26,6 +26,7 @@ extern "C" {
 
 #include <spa/pod/parser.h>
 #include <spa/param/video/format.h>
+#include <spa/param/format-utils.h>
 
 static inline int
 spa_format_video_raw_parse(const struct spa_pod *format,