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
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
#ifndef foomemblockqhfoo
#define foomemblockqhfoo
/* $Id$ */
/***
This file is part of polypaudio.
polypaudio 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 of the
License, or (at your option) any later version.
polypaudio 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
General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with polypaudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#include <sys/types.h>
#include "memblock.h"
#include "memchunk.h"
/* A memblockq is a queue of pa_memchunks (yepp, the name is not
* perfect). It is similar to the ring buffers used by most other
* audio software. In contrast to a ring buffer this memblockq data
* type doesn't need to copy any data around, it just maintains
* references to reference counted memory blocks. */
typedef struct pa_memblockq pa_memblockq;
/* Parameters:
- maxlength: maximum length of queue. If more data is pushed into the queue, data from the front is dropped
- length: the target length of the queue.
- base: a base value for all metrics. Only multiples of this value are popped from the queue
- prebuf: before passing the first byte out, make sure that enough bytes are in the queue
- minreq: pa_memblockq_missing() will only return values greater than this value
*/
pa_memblockq* pa_memblockq_new(size_t maxlength,
size_t tlength,
size_t base,
size_t prebuf,
size_t minreq,
pa_memblock_stat *s);
void pa_memblockq_free(pa_memblockq*bq);
/* Push a new memory chunk into the queue. Optionally specify a value for future cancellation. */
void pa_memblockq_push(pa_memblockq* bq, const pa_memchunk *chunk, size_t delta);
/* Same as pa_memblockq_push(), however chunks are filtered through a mcalign object, and thus aligned to multiples of base */
void pa_memblockq_push_align(pa_memblockq* bq, const pa_memchunk *chunk, size_t delta);
/* Return a copy of the next memory chunk in the queue. It is not removed from the queue */
int pa_memblockq_peek(pa_memblockq* bq, pa_memchunk *chunk);
/* Drop the specified bytes from the queue, only valid aufter pa_memblockq_peek() */
void pa_memblockq_drop(pa_memblockq *bq, const pa_memchunk *chunk, size_t length);
/* Drop the specified bytes from the queue */
void pa_memblockq_skip(pa_memblockq *bq, size_t length);
/* Shorten the pa_memblockq to the specified length by dropping data at the end of the queue */
void pa_memblockq_shorten(pa_memblockq *bq, size_t length);
/* Empty the pa_memblockq */
void pa_memblockq_empty(pa_memblockq *bq);
/* Test if the pa_memblockq is currently readable, that is, more data than base */
int pa_memblockq_is_readable(pa_memblockq *bq);
/* Test if the pa_memblockq is currently writable for the specified amount of bytes */
int pa_memblockq_is_writable(pa_memblockq *bq, size_t length);
/* Return the length of the queue in bytes */
uint32_t pa_memblockq_get_length(pa_memblockq *bq);
/* Return how many bytes are missing in queue to the specified fill amount */
uint32_t pa_memblockq_missing(pa_memblockq *bq);
/* Returns the minimal request value */
uint32_t pa_memblockq_get_minreq(pa_memblockq *bq);
/* Force disabling of pre-buf even when the pre-buffer is not yet filled */
void pa_memblockq_prebuf_disable(pa_memblockq *bq);
/* Reenable pre-buf to the initial level */
void pa_memblockq_prebuf_reenable(pa_memblockq *bq);
/* Manipulate the write pointer */
void pa_memblockq_seek(pa_memblockq *bq, size_t delta);
/* Flush the queue */
void pa_memblockq_flush(pa_memblockq *bq);
/* Get Target length */
uint32_t pa_memblockq_get_tlength(pa_memblockq *bq);
#endif
|
