mirror of
https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
synced 2025-11-19 07:00:03 -05:00
0e436a6926
is to allocate all audio memory blocks from a per-process memory pool which is available as read-only SHM segment to other local processes. Then, instead of writing the actual audio data to the socket just write references to this shared memory pool. To work optimally all memory blocks should now be of type PA_MEMBLOCK_POOL or PA_MEMBLOCK_POOL_EXTERNAL. The function pa_memblock_new() now generates memory blocks of this type by default. git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@1266 fefdeb5f-60dc-0310-8127-8f9354f1896f
62 lines
1.6 KiB
C
62 lines
1.6 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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assert(c);
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assert(c->memblock);
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assert(c->memblock->ref >= 1);
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if (c->memblock->ref == 1 && !c->memblock->read_only && c->memblock->length >= 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(c->memblock->pool, l);
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memcpy(n->data, (uint8_t*) c->memblock->data + c->index, c->length);
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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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