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https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
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d210ebbb09
pa_memblock is now an opaque structure. Access to its fields is now done through various accessor functions in a thread-safe manner. pa_memblock_acquire() and pa_memblock_release() are now used to access the attached audio data. Why? To allow safe manipulation of the memory pointer maintained by the memory block. Internally _acquire() and _release() maintain a reference counter. Please do not confuse this reference counter whith the one maintained by pa_memblock_ref()/_unref()! As a side effect this patch removes all direct usages of AO_t and replaces it with pa_atomic_xxx based code. This stuff needs some serious testing love. Especially if threads are actively used. git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@1404 fefdeb5f-60dc-0310-8127-8f9354f1896f
67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
/* $Id$ */
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/***
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This file is part of PulseAudio.
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PulseAudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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PulseAudio is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with PulseAudio; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <string.h>
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#include <pulse/xmalloc.h>
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#include "memchunk.h"
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void pa_memchunk_make_writable(pa_memchunk *c, size_t min) {
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pa_memblock *n;
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size_t l;
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void *tdata, *sdata;
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assert(c);
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assert(c->memblock);
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if (pa_memblock_is_read_only(c->memblock) &&
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pa_memblock_get_length(c->memblock) >= c->index+min)
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return;
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l = c->length;
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if (l < min)
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l = min;
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n = pa_memblock_new(pa_memblock_get_pool(c->memblock), l);
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tdata = pa_memblock_acquire(n);
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sdata = pa_memblock_acquire(c->memblock);
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memcpy(tdata, (uint8_t*) sdata + c->index, c->length);
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pa_memblock_release(n);
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pa_memblock_release(c->memblock);
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pa_memblock_unref(c->memblock);
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c->memblock = n;
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c->index = 0;
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}
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void pa_memchunk_reset(pa_memchunk *c) {
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assert(c);
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c->memblock = NULL;
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c->length = c->index = 0;
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}
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