1 files changed, 151 insertions, 0 deletions
diff --git a/src/pulsecore/memblockq.h b/src/pulsecore/memblockq.h
new file mode 100644
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--- /dev/null
+++ b/src/pulsecore/memblockq.h
@@ -0,0 +1,151 @@
+#ifndef foomemblockqhfoo
+#define foomemblockqhfoo
+
+/* $Id$ */
+
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2004-2006 Lennart Poettering
+
+  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 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, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#include <sys/types.h>
+#include <inttypes.h>
+
+#include <pulsecore/memblock.h>
+#include <pulsecore/memchunk.h>
+#include <pulse/def.h>
+
+/* A memblockq is a queue of pa_memchunks (yepp, the name is not
+ * perfect). It is similar to the ring buffers used by most other
+ * audio software. In contrast to a ring buffer this memblockq data
+ * type doesn't need to copy any data around, it just maintains
+ * references to reference counted memory blocks. */
+
+typedef struct pa_memblockq pa_memblockq;
+
+
+/* Parameters:
+
+   - idx:       start value for both read and write index
+
+   - maxlength: maximum length of queue. If more data is pushed into
+                the queue, the operation will fail. Must not be 0.
+
+   - tlength:   the target length of the queue. Pass 0 for the default.
+
+   - base:      a base value for all metrics. Only multiples of this value
+                are popped from the queue or should be pushed into
+                it. Must not be 0.
+
+   - prebuf:    If the queue runs empty wait until this many bytes are in
+                queue again before passing the first byte out. If set
+                to 0 pa_memblockq_pop() will return a silence memblock
+                if no data is in the queue and will never fail. Pass
+                (size_t) -1 for the default.
+
+   - minreq:    pa_memblockq_missing() will only return values greater
+                than this value. Pass 0 for the default.
+
+   - silence:   return this memblock when reading unitialized data
+*/
+pa_memblockq* pa_memblockq_new(
+        int64_t idx,
+        size_t maxlength,
+        size_t tlength,
+        size_t base,
+        size_t prebuf,
+        size_t minreq,
+        pa_memblock *silence);
+
+void pa_memblockq_free(pa_memblockq*bq);
+
+/* Push a new memory chunk into the queue.  */
+int pa_memblockq_push(pa_memblockq* bq, const pa_memchunk *chunk);
+
+/* Push a new memory chunk into the queue, but filter it through a
+ * pa_mcalign object. Don't mix this with pa_memblockq_seek() unless
+ * you know what you do. */
+int pa_memblockq_push_align(pa_memblockq* bq, const pa_memchunk *chunk);
+
+/* Return a copy of the next memory chunk in the queue. It is not
+ * removed from the queue. There are two reasons this function might
+ * fail: 1. prebuffering is active, 2. queue is empty and no silence
+ * memblock was passed at initialization. If the queue is not empty,
+ * but we're currently at a hole in the queue and no silence memblock
+ * was passed we return the length of the hole in chunk->length. */
+int pa_memblockq_peek(pa_memblockq* bq, pa_memchunk *chunk);
+
+/* Drop the specified bytes from the queue. */
+void pa_memblockq_drop(pa_memblockq *bq, size_t length);
+
+/* Test if the pa_memblockq is currently readable, that is, more data than base */
+int pa_memblockq_is_readable(pa_memblockq *bq);
+
+/* Return the length of the queue in bytes */
+size_t pa_memblockq_get_length(pa_memblockq *bq);
+
+/* Return how many bytes are missing in queue to the specified fill amount */
+size_t pa_memblockq_missing(pa_memblockq *bq);
+
+/* Return the number of bytes that are missing since the last call to
+ * this function, reset the internal counter to 0. */
+size_t pa_memblockq_pop_missing(pa_memblockq *bq);
+
+/* Returns the minimal request value */
+size_t pa_memblockq_get_minreq(pa_memblockq *bq);
+
+/* Manipulate the write pointer */
+void pa_memblockq_seek(pa_memblockq *bq, int64_t offset, pa_seek_mode_t seek);
+
+/* Set the queue to silence, set write index to read index */
+void pa_memblockq_flush(pa_memblockq *bq);
+
+/* Get Target length */
+size_t pa_memblockq_get_tlength(pa_memblockq *bq);
+
+/* Return the current read index */
+int64_t pa_memblockq_get_read_index(pa_memblockq *bq);
+
+/* Return the current write index */
+int64_t pa_memblockq_get_write_index(pa_memblockq *bq);
+
+/* Shorten the pa_memblockq to the specified length by dropping data
+ * at the read end of the queue. The read index is increased until the
+ * queue has the specified length */
+void pa_memblockq_shorten(pa_memblockq *bq, size_t length);
+
+/* Ignore prebuf for now */
+void pa_memblockq_prebuf_disable(pa_memblockq *bq);
+
+/* Force prebuf */
+void pa_memblockq_prebuf_force(pa_memblockq *bq);
+
+/* Return the maximum length of the queue in bytes */
+size_t pa_memblockq_get_maxlength(pa_memblockq *bq);
+
+/* Return the prebuffer length in bytes */
+size_t pa_memblockq_get_prebuf(pa_memblockq *bq);
+
+/* Change metrics. */
+void pa_memblockq_set_maxlength(pa_memblockq *memblockq, size_t maxlength);
+void pa_memblockq_set_tlength(pa_memblockq *memblockq, size_t tlength);
+void pa_memblockq_set_prebuf(pa_memblockq *memblockq, size_t prebuf);
+void pa_memblockq_set_minreq(pa_memblockq *memblockq, size_t minreq);
+
+#endif