source: roaraudio/libroarpulse/sample.c @ 4959:d12fc58681b0

Last change on this file since 4959:d12fc58681b0 was 4708:c9d40761088a, checked in by phi, 13 years ago

updated copyright statements

File size: 5.4 KB
Line 
1//sample.c:
2
3/*
4 *      Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010-2011
5 *  The code (may) include prototypes and comments (and maybe
6 *  other code fragements) from libpulse*. They are mostly copyrighted by:
7 *  Lennart Poettering <poettering@users.sourceforge.net> and
8 *  Pierre Ossman <drzeus@drzeus.cx>
9 *
10 *  This file is part of libroarpulse a part of RoarAudio,
11 *  a cross-platform sound system for both, home and professional use.
12 *  See README for details.
13 *
14 *  This file is free software; you can redistribute it and/or modify
15 *  it under the terms of the GNU General Public License version 3
16 *  as published by the Free Software Foundation.
17 *
18 *  RoarAudio is distributed in the hope that it will be useful,
19 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
20 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21 *  GNU General Public License for more details.
22 *
23 *  You should have received a copy of the GNU General Public License
24 *  along with this software; see the file COPYING.  If not, write to
25 *  the Free Software Foundation, 51 Franklin Street, Fifth Floor,
26 *  Boston, MA 02110-1301, USA.
27 *
28 *  NOTE for everyone want's to change something and send patches:
29 *  read README and HACKING! There a addition information on
30 *  the license of this document you need to read before you send
31 *  any patches.
32 *
33 *  NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc
34 *  or libpulse*:
35 *  The libs libroaresd, libroararts and libroarpulse link this libroar
36 *  and are therefore GPL. Because of this it may be illigal to use
37 *  them with any software that uses libesd, libartsc or libpulse*.
38 */
39
40#include <libroarpulse/libroarpulse.h>
41
42/** Return the amount of bytes playback of a second of audio with the specified sample type takes */
43size_t pa_bytes_per_second(const pa_sample_spec *spec);
44
45/** Return the size of a frame with the specific sample type */
46size_t pa_frame_size(const pa_sample_spec *spec) {
47 if ( spec == NULL )
48  return 0;
49
50 return pa_sample_size(spec) * spec->channels;
51}
52
53/** Return the size of a sample with the specific sample type */
54size_t pa_sample_size(const pa_sample_spec *spec) {
55 if ( spec == NULL )
56  return -1;
57
58 switch (spec->format) {
59  case PA_SAMPLE_ALAW:
60  case PA_SAMPLE_ULAW:
61  case PA_SAMPLE_U8:
62    return 1;
63   break;
64  case PA_SAMPLE_S16LE:
65  case PA_SAMPLE_S16BE:
66    return 2;
67   break;
68  default:
69    return 0;
70   break;
71 }
72
73 return 0;
74}
75
76/** Calculate the time the specified bytes take to play with the specified sample type */
77pa_usec_t pa_bytes_to_usec(uint64_t length, const pa_sample_spec *spec) {
78 if ( spec == NULL )
79  return 0;
80
81 return (pa_usec_t) (((double) length/pa_frame_size(spec)*1000000)/spec->rate);
82}
83
84/** Calculates the number of bytes that are required for the specified time. \since 0.9 */
85size_t pa_usec_to_bytes(pa_usec_t t, const pa_sample_spec *spec) {
86 if ( spec == NULL )
87  return 0;
88
89 return (size_t) (((double) t * spec->rate / 1000000))*pa_frame_size(spec);
90}
91
92/** Return non-zero when the sample type specification is valid */
93int pa_sample_spec_valid(const pa_sample_spec *spec) {
94 if ( spec == NULL )
95  return 0;
96
97 if ( spec->channels < 1 || spec->channels > ROAR_MAX_CHANNELS )
98  return 0;
99
100 if ( spec->format < 0 || spec->format > PA_SAMPLE_MAX )
101  return 0;
102
103 return 1;
104}
105
106/** Return non-zero when the two sample type specifications match */
107int pa_sample_spec_equal(const pa_sample_spec*a, const pa_sample_spec*b) {
108 if ( a->rate != b->rate )
109  return 0;
110
111 if ( a->channels != b->channels )
112  return 0;
113
114 if ( a->format != b->format )
115  return 0;
116
117 return 1;
118}
119
120/** Return a descriptive string for the specified sample format. \since 0.8 */
121static struct {
122 pa_sample_format_t format;
123 const char * name;
124} _roar_pa_format[] = {
125 {PA_SAMPLE_U8,        "u8"       },
126 {PA_SAMPLE_ALAW,      "aLaw"     },
127 {PA_SAMPLE_ULAW,      "uLaw"     },
128 {PA_SAMPLE_S16LE,     "s16le"    },
129 {PA_SAMPLE_S16BE,     "s16be"    },
130 {PA_SAMPLE_FLOAT32LE, "float32le"},
131 {PA_SAMPLE_FLOAT32BE, "float32be"},
132 {PA_SAMPLE_INVALID,   NULL       }
133};
134
135const char *pa_sample_format_to_string(pa_sample_format_t f) {
136 int i;
137
138 for (i = 0; _roar_pa_format[i].name != NULL; i++)
139  if ( _roar_pa_format[i].format == f )
140   return _roar_pa_format[i].name;
141
142 return NULL;
143}
144
145/** Parse a sample format text. Inverse of pa_sample_format_to_string() */
146pa_sample_format_t pa_parse_sample_format(const char *format) {
147 int i;
148
149 for (i = 0; _roar_pa_format[i].name != NULL; i++)
150  if ( !strcasecmp(_roar_pa_format[i].name, format) )
151   return _roar_pa_format[i].format;
152
153 return PA_SAMPLE_INVALID;
154}
155
156/** Maximum required string length for pa_sample_spec_snprint() */
157#define PA_SAMPLE_SPEC_SNPRINT_MAX 32
158
159/** Pretty print a sample type specification to a string */
160char* pa_sample_spec_snprint(char *s, size_t l, const pa_sample_spec *spec) {
161 if ( s == NULL || l == 0 || spec == NULL )
162  return NULL;
163
164 if ( pa_sample_spec_valid(spec) ) {
165  snprintf(s, l, "%s %uch %uHz", pa_sample_format_to_string(spec->format), spec->channels, spec->rate);
166 } else {
167  snprintf(s, l, "Invalid");
168 }
169
170 return s;
171}
172
173/** Pretty print a byte size value. (i.e. "2.5 MiB") */
174char* pa_bytes_snprint(char *s, size_t l, unsigned v) {
175 double val = v;
176 int    i;
177 const char pre[] = "KMGTP";
178
179 if ( v <= 1024 ) {
180  snprintf(s, l, "%u B", v);
181  return s;
182 }
183
184 for (i = 0; pre[i] != 0; i++) {
185  val /= 1024;
186  if ( val <= 1024 ) {
187   snprintf(s, l, "%0.1f %ciB", val, pre[i]);
188   return s;
189  }
190 }
191
192 snprintf(s, l, "%0.1f %ciB", val*1024., pre[i-1]);
193 return s;
194}
195
196//ll
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