1 files changed, 48 insertions, 0 deletions
diff --git a/src/pulsecore/stream-util.h b/src/pulsecore/stream-util.h
new file mode 100644
index 0000000..b2e47fe
--- /dev/null
+++ b/src/pulsecore/stream-util.h
@@ -0,0 +1,48 @@
+#ifndef foostreamutilhfoo
+#define foostreamutilhfoo
+
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2013 Intel Corporation
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published
+  by the Free Software Foundation; either version 2.1 of the License,
+  or (at your option) any later version.
+
+  PulseAudio 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
+  General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <pulse/format.h>
+#include <pulse/volume.h>
+
+/* This is a helper function that is called from pa_sink_input_new() and
+ * pa_source_output_new(). The job of this function is to figure out what
+ * channel map should be used for interpreting the volume that was set for the
+ * stream. The channel map that the client intended for the volume may be
+ * different than the final stream channel map, because the client may want the
+ * server to decide the stream channel map.
+ *
+ * volume is the volume for which the channel map should be figured out.
+ *
+ * original_map is the channel map that is set in the new data struct's
+ * channel_map field. If the channel map hasn't been set in the new data, then
+ * original_map should be NULL.
+ *
+ * format is the negotiated format for the stream. It's used as a fallback if
+ * original_map is not available.
+ *
+ * On success, the result is saved in volume_map. It's possible that this
+ * function fails to figure out the right channel map for the volume, in which
+ * case a negative error code is returned. */
+int pa_stream_get_volume_channel_map(const pa_cvolume *volume, const pa_channel_map *original_map, const pa_format_info *format,
+                                     pa_channel_map *volume_map);
+
+#endif