1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
#ifndef foomcalignhfoo
#define foomcalignhfoo
/* $Id$ */
/***
This file is part of PulseAudio.
Copyright 2004-2006 Lennart Poettering
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with PulseAudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#include <pulsecore/memblock.h>
#include <pulsecore/memchunk.h>
/* An alignment object, used for aligning memchunks to multiples of
* the frame size. */
/* Method of operation: the user creates a new mcalign object by
* calling pa_mcalign_new() with the appropriate aligning
* granularity. After that he may call pa_mcalign_push() for an input
* memchunk. After exactly one memchunk the user has to call
* pa_mcalign_pop() until it returns -1. If pa_mcalign_pop() returns
* 0, the memchunk *c is valid and aligned to the granularity. Some
* pseudocode illustrating this:
*
* pa_mcalign *a = pa_mcalign_new(4, NULL);
*
* for (;;) {
* pa_memchunk input;
*
* ... fill input ...
*
* pa_mcalign_push(m, &input);
* pa_memblock_unref(input.memblock);
*
* for (;;) {
* pa_memchunk output;
*
* if (pa_mcalign_pop(m, &output) < 0)
* break;
*
* ... consume output ...
*
* pa_memblock_unref(output.memblock);
* }
* }
*
* pa_memchunk_free(a);
* */
typedef struct pa_mcalign pa_mcalign;
pa_mcalign *pa_mcalign_new(size_t base);
void pa_mcalign_free(pa_mcalign *m);
/* Push a new memchunk into the aligner. The caller of this routine
* has to free the memchunk by himself. */
void pa_mcalign_push(pa_mcalign *m, const pa_memchunk *c);
/* Pop a new memchunk from the aligner. Returns 0 when sucessful,
* nonzero otherwise. */
int pa_mcalign_pop(pa_mcalign *m, pa_memchunk *c);
/* If we pass l bytes in now, how many bytes would we get out? */
size_t pa_mcalign_csize(pa_mcalign *m, size_t l);
/* Flush what's still stored in the aligner */
void pa_mcalign_flush(pa_mcalign *m);
#endif
|
