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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)

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git-svn-id: file:///home/lennart/svn/public/pulseaudio/branches/lennart@1826 fefdeb5f-60dc-0310-8127-8f9354f1896f
This commit is contained in:
Lennart Poettering 2007-09-16 15:05:26 +00:00
parent 298d2392f9
commit 0469c84366
1 changed files with 21 additions and 2 deletions
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23
src/pulsecore/sample-util.c
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@ -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;
}