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78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
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#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 polypaudio.
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polypaudio 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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polypaudio 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 polypaudio; 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 "memblock.h"
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#include "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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* struct pa_mcalign *a = pa_mcalign_new(4, NULL);
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*
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* for (;;) {
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* struct 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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* struct 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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struct pa_mcalign;
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struct pa_mcalign *pa_mcalign_new(size_t base, struct pa_memblock_stat *s);
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void pa_mcalign_free(struct 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(struct pa_mcalign *m, const struct 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(struct pa_mcalign *m, struct pa_memchunk *c);
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#endif
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