1 files changed, 81 insertions, 0 deletions
diff --git a/src/pulsecore/mcalign.h b/src/pulsecore/mcalign.h
new file mode 100644
index 0000000..353e66a
--- /dev/null
+++ b/src/pulsecore/mcalign.h
@@ -0,0 +1,81 @@
+#ifndef foomcalignhfoo
+#define foomcalignhfoo
+
+/***
+  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 2.1 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 <pulsecore/memblock.h>
+#include <pulsecore/memchunk.h>
+
+/* An alignment object, used for aligning memchunks to multiples of
+ * the frame size. */
+
+/* Method of operation: the user creates a new mcalign object by
+ * calling pa_mcalign_new() with the appropriate aligning
+ * granularity. After that they may call pa_mcalign_push() for an input
+ * memchunk. After exactly one memchunk the user has to call
+ * pa_mcalign_pop() until it returns -1. If pa_mcalign_pop() returns
+ * 0, the memchunk *c is valid and aligned to the granularity. Some
+ * pseudocode illustrating this:
+ *
+ * pa_mcalign *a = pa_mcalign_new(4, NULL);
+ *
+ * for (;;) {
+ *   pa_memchunk input;
+ *
+ *   ... fill input ...
+ *
+ *   pa_mcalign_push(m, &input);
+ *   pa_memblock_unref(input.memblock);
+ *
+ *   for (;;) {
+ *     pa_memchunk output;
+ *
+ *     if (pa_mcalign_pop(m, &output) < 0)
+ *       break;
+ *
+ *     ... consume output ...
+ *
+ *     pa_memblock_unref(output.memblock);
+ *   }
+ * }
+ *
+ * pa_memchunk_free(a);
+ * */
+
+typedef struct pa_mcalign pa_mcalign;
+
+pa_mcalign *pa_mcalign_new(size_t base);
+void pa_mcalign_free(pa_mcalign *m);
+
+/* Push a new memchunk into the aligner. The caller of this routine
+ * has to free the memchunk by himself. */
+void pa_mcalign_push(pa_mcalign *m, const pa_memchunk *c);
+
+/* Pop a new memchunk from the aligner. Returns 0 when successful,
+ * nonzero otherwise. */
+int pa_mcalign_pop(pa_mcalign *m, pa_memchunk *c);
+
+/* If we pass l bytes in now, how many bytes would we get out? */
+size_t pa_mcalign_csize(pa_mcalign *m, size_t l);
+
+/* Flush what's still stored in the aligner */
+void pa_mcalign_flush(pa_mcalign *m);
+
+#endif