add bufferq structure

git-svn-id: file:///home/lennart/svn/public/libsydney/trunk@17 9ba3c220-e4d3-45a2-8aa3-73fcc9aff6ce

1 files changed, 35 insertions, 0 deletions

diff --git a/bufferq.h b/bufferq.h
new file mode 100644
index 0000000..da4eac3
--- /dev/null
+++ b/bufferq.h
@@ -0,0 +1,35 @@
+#ifndef foosydneybufferqhfoo
+#define foosydneybufferqhfoo
+
+#include <inttypes.h>
+
+#include "macro.h"
+#include "llist.h"
+#include "sydney.h"
+
+typedef struct bufferq_item {
+    int64_t idx;
+    size_t size;
+    SA_LLIST_ITEM(struct bufferq_item, bufferq);
+} bufferq_item_t;
+
+#define BUFFERQ_ITEM_DATA(x) ((void*) (uint8_t*) (x) + ALIGN(sizeof(bufferq_item_t)))
+
+typedef struct bufferq {
+    SA_LLIST_HEAD(bufferq_item_t, *items);
+    bufferq_item_t **last;
+    int64_t read_index, write_index, end_index;
+    size_t sample_size;
+    unsigned nchannels;
+} bufferq_t;
+
+int bufferq_init(bufferq_t *q, unsigned nchannels, size_t sample_size);
+
+void bufferq_done(bufferq_t *q);
+
+int bufferq_push(bufferq_t *q, unsigned channel, const void *data, size_t nbytes, int64_t offset, sa_seek_t whence);
+
+int bufferq_get(bufferq_t *q, void *i[], size_t *bytes);
+int bufferq_drop(bufferq_t *q, int64_t bytes);
+
+#endif