mirror of
https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
synced 2025-11-07 13:30:03 -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
80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
#ifndef foomcalignhfoo
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#define foomcalignhfoo
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/* $Id$ */
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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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#include <pulsecore/memblock.h>
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#include <pulsecore/memchunk.h>
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/* An alignment object, used for aligning memchunks to multiples of
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* the frame size. */
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/* Method of operation: the user creates a new mcalign object by
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* calling pa_mcalign_new() with the appropriate aligning
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* granularity. After that he may call pa_mcalign_push() for an input
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* memchunk. After exactly one memchunk the user has to call
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* pa_mcalign_pop() until it returns -1. If pa_mcalign_pop() returns
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* 0, the memchunk *c is valid and aligned to the granularity. Some
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* pseudocode illustrating this:
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*
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* pa_mcalign *a = pa_mcalign_new(4, NULL);
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*
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* for (;;) {
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* pa_memchunk input;
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*
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* ... fill input ...
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*
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* pa_mcalign_push(m, &input);
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* pa_memblock_unref(input.memblock);
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*
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* for (;;) {
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* pa_memchunk output;
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*
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* if (pa_mcalign_pop(m, &output) < 0)
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* break;
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*
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* ... consume output ...
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*
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* pa_memblock_unref(output.memblock);
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* }
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* }
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*
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* pa_memchunk_free(a);
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* */
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typedef struct pa_mcalign pa_mcalign;
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pa_mcalign *pa_mcalign_new(size_t base);
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void pa_mcalign_free(pa_mcalign *m);
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/* Push a new memchunk into the aligner. The caller of this routine
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* has to free the memchunk by himself. */
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void pa_mcalign_push(pa_mcalign *m, const pa_memchunk *c);
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/* Pop a new memchunk from the aligner. Returns 0 when sucessful,
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* nonzero otherwise. */
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int pa_mcalign_pop(pa_mcalign *m, pa_memchunk *c);
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/* If we pass l bytes in now, how many bytes would we get out? */
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size_t pa_mcalign_csize(pa_mcalign *m, size_t l);
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#endif
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