really create glitch-free branch

git-svn-id: file:///home/lennart/svn/public/pulseaudio/branches/glitch-free@2120 fefdeb5f-60dc-0310-8127-8f9354f1896f

1 files changed, 92 insertions, 0 deletions

diff --git a/src/pulsecore/memchunk.c b/src/pulsecore/memchunk.c
new file mode 100644
index 00000000..4e73b636
--- /dev/null
+++ b/src/pulsecore/memchunk.c
@@ -0,0 +1,92 @@
+/* $Id$ */
+
+/***
+  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 2.1 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, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include <pulse/xmalloc.h>
+#include <pulsecore/macro.h>
+#include <pulsecore/core-util.h>
+
+#include "memchunk.h"
+
+pa_memchunk* pa_memchunk_make_writable(pa_memchunk *c, size_t min) {
+    pa_memblock *n;
+    size_t l;
+    void *tdata, *sdata;
+
+    pa_assert(c);
+    pa_assert(c->memblock);
+
+    if (pa_memblock_ref_is_one(c->memblock) &&
+        !pa_memblock_is_read_only(c->memblock) &&
+        pa_memblock_get_length(c->memblock) >= c->index+min)
+        return c;
+
+    l = c->length;
+    if (l < min)
+        l = min;
+
+    n = pa_memblock_new(pa_memblock_get_pool(c->memblock), l);
+    tdata = pa_memblock_acquire(n);
+    sdata = pa_memblock_acquire(c->memblock);
+    memcpy(tdata, (uint8_t*) sdata + c->index, c->length);
+    pa_memblock_release(n);
+    pa_memblock_release(c->memblock);
+    pa_memblock_unref(c->memblock);
+    c->memblock = n;
+    c->index = 0;
+
+    return c;
+}
+
+pa_memchunk* pa_memchunk_reset(pa_memchunk *c) {
+    pa_assert(c);
+
+    c->memblock = NULL;
+    c->length = c->index = 0;
+
+    return c;
+}
+
+pa_memchunk *pa_memchunk_will_need(const pa_memchunk *c) {
+    void *p;
+
+    pa_assert(c);
+    pa_assert(c->memblock);
+
+    /* A version of pa_memblock_will_need() that works on memchunks
+     * instead of memblocks */
+
+    p = (uint8_t*) pa_memblock_acquire(c->memblock) + c->index;
+    pa_will_need(p, c->length);
+    pa_memblock_release(c->memblock);
+
+    return (pa_memchunk*) c;
+}