From 0469c8436655cb4cc422216ab8a13849080f14c0 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Sun, 16 Sep 2007 15:05:26 +0000
Subject: [PATCH] add frame alignment APIs; don't require memory to be writable
 when silencing it (required of the mmap modes drivers where the hw data needs
 to be silenced, although it is not writable to others)

git-svn-id: file:///home/lennart/svn/public/pulseaudio/branches/lennart@1826 fefdeb5f-60dc-0310-8127-8f9354f1896f
---
 src/pulsecore/sample-util.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/src/pulsecore/sample-util.c b/src/pulsecore/sample-util.c
index a1361f4..add6608 100644
--- a/src/pulsecore/sample-util.c
+++ b/src/pulsecore/sample-util.c
@@ -38,7 +38,7 @@
 #include "sample-util.h"
 #include "endianmacros.h"
 
-#define PA_SILENCE_MAX (1024*1024*1)
+#define PA_SILENCE_MAX (PA_PAGE_SIZE*16)
 
 pa_memblock *pa_silence_memblock_new(pa_mempool *pool, const pa_sample_spec *spec, size_t length) {
     size_t fs;
@@ -82,7 +82,6 @@ void pa_silence_memchunk(pa_memchunk *c, const pa_sample_spec *spec) {
     pa_assert(c->memblock);
     pa_assert(spec);
 
-    pa_memchunk_make_writable(c, 0);
     data = pa_memblock_acquire(c->memblock);
     pa_silence_memory((uint8_t*) data+c->index, c->length, spec);
     pa_memblock_release(c->memblock);
@@ -474,3 +473,23 @@ void pa_volume_memchunk(
     pa_memblock_release(c->memblock);
 }
 
+size_t pa_frame_align(size_t l, const pa_sample_spec *ss) {
+    size_t fs;
+
+    pa_assert(ss);
+    
+    fs = pa_frame_size(ss);
+
+    return (l/fs) * fs;
+}
+
+int pa_frame_aligned(size_t l, const pa_sample_spec *ss) {
+    size_t fs;
+    
+    pa_assert(ss);
+
+    fs = pa_frame_size(ss);
+    
+    return l % fs == 0;
+}
+
-- 
2.7.4