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
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
|
#ifndef foosamplehfoo
#define foosamplehfoo
/* $Id$ */
/***
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 <inttypes.h>
#include <sys/types.h>
#include <math.h>
#include <polyp/cdecl.h>
/** \file
* Constants and routines for sample type handling */
PA_C_DECL_BEGIN
/* Maximum allowed channels */
#define PA_CHANNELS_MAX 16
/** Sample format */
typedef enum pa_sample_format {
PA_SAMPLE_U8, /**< Unsigned 8 Bit PCM */
PA_SAMPLE_ALAW, /**< 8 Bit a-Law */
PA_SAMPLE_ULAW, /**< 8 Bit mu-Law */
PA_SAMPLE_S16LE, /**< Signed 16 Bit PCM, little endian (PC) */
PA_SAMPLE_S16BE, /**< Signed 16 Bit PCM, big endian */
PA_SAMPLE_FLOAT32LE, /**< 32 Bit IEEE floating point, little endian, range -1..1 */
PA_SAMPLE_FLOAT32BE, /**< 32 Bit IEEE floating point, big endian, range -1..1 */
PA_SAMPLE_MAX, /**< Upper limit of valid sample types */
PA_SAMPLE_INVALID = -1 /**< An invalid value */
} pa_sample_format_t;
#ifdef WORDS_BIGENDIAN
/** Signed 16 Bit PCM, native endian */
#define PA_SAMPLE_S16NE PA_SAMPLE_S16BE
/** 32 Bit IEEE floating point, native endian */
#define PA_SAMPLE_FLOAT32NE PA_SAMPLE_FLOAT32BE
/** Signed 16 Bit PCM reverse endian */
#define PA_SAMPLE_S16RE PA_SAMPLE_S16LE
/** 32 Bit IEEE floating point, reverse endian */
#define PA_SAMPLE_FLOAT32RE PA_SAMPLE_FLOAT32LE
#else
/** Signed 16 Bit PCM, native endian */
#define PA_SAMPLE_S16NE PA_SAMPLE_S16LE
/** 32 Bit IEEE floating point, native endian */
#define PA_SAMPLE_FLOAT32NE PA_SAMPLE_FLOAT32LE
/** Signed 16 Bit PCM reverse endian */
#define PA_SAMPLE_S16RE PA_SAMPLE_S16BE
/** 32 Bit IEEE floating point, reverse endian */
#define PA_SAMPLE_FLOAT32RE PA_SAMPLE_FLOAT32BE
#endif
/** A Shortcut for PA_SAMPLE_FLOAT32NE */
#define PA_SAMPLE_FLOAT32 PA_SAMPLE_FLOAT32NE
/** A sample format and attribute specification */
typedef struct pa_sample_spec {
pa_sample_format_t format; /**< The sample format */
uint32_t rate; /**< The sample rate. (e.g. 44100) */
uint8_t channels; /**< Audio channels. (1 for mono, 2 for stereo, ...) */
} pa_sample_spec;
/** Type for usec specifications (unsigned). May be either 32 or 64 bit, depending on the architecture */
typedef uint64_t pa_usec_t;
/** Return the amount of bytes playback of a second of audio with the specified sample type takes */
size_t pa_bytes_per_second(const pa_sample_spec *spec);
/** Return the size of a frame with the specific sample type */
size_t pa_frame_size(const pa_sample_spec *spec);
/** Return the size of a sample with the specific sample type */
size_t pa_sample_size(const pa_sample_spec *spec);
/** Calculate the time the specified bytes take to play with the specified sample type */
pa_usec_t pa_bytes_to_usec(uint64_t length, const pa_sample_spec *spec);
/** Return non-zero when the sample type specification is valid */
int pa_sample_spec_valid(const pa_sample_spec *spec);
/** Return non-zero when the two sample type specifications match */
int pa_sample_spec_equal(const pa_sample_spec*a, const pa_sample_spec*b);
/* Return a descriptive string for the specified sample format. \since 0.8 */
const char *pa_sample_format_to_string(pa_sample_format_t f);
/** Parse a sample format text. Inverse of pa_sample_format_to_string() */
pa_sample_format_t pa_parse_sample_format(const char *format);
/** Maximum required string length for pa_sample_spec_snprint() */
#define PA_SAMPLE_SPEC_SNPRINT_MAX 32
/** Pretty print a sample type specification to a string */
char* pa_sample_spec_snprint(char *s, size_t l, const pa_sample_spec *spec);
/** Pretty print a byte size value. (i.e. "2.5 MB") */
void pa_bytes_snprint(char *s, size_t l, unsigned v);
PA_C_DECL_END
#endif
|
