1 files changed, 57 insertions, 0 deletions
diff --git a/src/pulsecore/srbchannel.h b/src/pulsecore/srbchannel.h
new file mode 100644
index 0000000..09193e0
--- /dev/null
+++ b/src/pulsecore/srbchannel.h
@@ -0,0 +1,57 @@
+#ifndef foopulsesrbchannelhfoo
+#define foopulsesrbchannelhfoo
+
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2014 David Henningsson, Canonical Ltd.
+
+  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
+  Lesser 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/mainloop-api.h>
+#include <pulsecore/fdsem.h>
+#include <pulsecore/memblock.h>
+
+/* An shm ringbuffer that is used for low overhead server-client communication.
+ * Signaling is done through eventfd semaphores (pa_fdsem). */
+
+typedef struct pa_srbchannel pa_srbchannel;
+
+typedef struct pa_srbchannel_template {
+    int readfd, writefd;
+    pa_memblock *memblock;
+} pa_srbchannel_template;
+
+pa_srbchannel* pa_srbchannel_new(pa_mainloop_api *m, pa_mempool *p);
+/* Note: this creates a srbchannel with swapped read and write. */
+pa_srbchannel* pa_srbchannel_new_from_template(pa_mainloop_api *m, pa_srbchannel_template *t);
+
+void pa_srbchannel_free(pa_srbchannel *sr);
+
+void pa_srbchannel_export(pa_srbchannel *sr, pa_srbchannel_template *t);
+
+size_t pa_srbchannel_write(pa_srbchannel *sr, const void *data, size_t l);
+size_t pa_srbchannel_read(pa_srbchannel *sr, void *data, size_t l);
+
+/* Set the callback function that is called whenever data becomes available for reading.
+ * It can also be called if the output buffer was full and can now be written to.
+ *
+ * Return false to abort all processing (e g if the srbchannel has been freed during the callback).
+ * Otherwise return true.
+*/
+typedef bool (*pa_srbchannel_cb_t)(pa_srbchannel *sr, void *userdata);
+void pa_srbchannel_set_callback(pa_srbchannel *sr, pa_srbchannel_cb_t callback, void *userdata);
+
+#endif