code.delx.au - pulseaudio/blob - src/pulse/sample.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2004-2006 Lennart Poettering
   7   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
   8
   9   PulseAudio is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU Lesser General Public License as published
  11   by the Free Software Foundation; either version 2 of the License,
  12   or (at your option) any later version.
  13
  14   PulseAudio is distributed in the hope that it will be useful, but
  15   WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17   General Public License for more details.
  18
  19   You should have received a copy of the GNU Lesser General Public License
  20   along with PulseAudio; if not, write to the Free Software
  21   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22   USA.
  23 ***/
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include <config.h>
  27 #endif
  28
  29 #include <stdio.h>
  30 #include <math.h>
  31 #include <string.h>
  32
  33 #include <pulsecore/core-util.h>
  34 #include <pulsecore/macro.h>
  35
  36 #include "sample.h"
  37
  38 size_t pa_sample_size(const pa_sample_spec *spec) {
  39
  40     static const size_t table[] = {
  41         [PA_SAMPLE_U8] = 1,
  42         [PA_SAMPLE_ULAW] = 1,
  43         [PA_SAMPLE_ALAW] = 1,
  44         [PA_SAMPLE_S16LE] = 2,
  45         [PA_SAMPLE_S16BE] = 2,
  46         [PA_SAMPLE_FLOAT32LE] = 4,
  47         [PA_SAMPLE_FLOAT32BE] = 4
  48     };
  49
  50     pa_assert(spec);
  51     pa_assert(spec->format >= 0);
  52     pa_assert(spec->format < PA_SAMPLE_MAX);
  53
  54     return table[spec->format];
  55 }
  56
  57 size_t pa_frame_size(const pa_sample_spec *spec) {
  58     pa_assert(spec);
  59
  60     return pa_sample_size(spec) * spec->channels;
  61 }
  62
  63 size_t pa_bytes_per_second(const pa_sample_spec *spec) {
  64     pa_assert(spec);
  65     return spec->rate*pa_frame_size(spec);
  66 }
  67
  68 pa_usec_t pa_bytes_to_usec(uint64_t length, const pa_sample_spec *spec) {
  69     pa_assert(spec);
  70
  71     return (pa_usec_t) (((double) length/pa_frame_size(spec)*1000000)/spec->rate);
  72 }
  73
  74 size_t pa_usec_to_bytes(pa_usec_t t, const pa_sample_spec *spec) {
  75     pa_assert(spec);
  76
  77     return (size_t) (((double) t * spec->rate / 1000000))*pa_frame_size(spec);
  78 }
  79
  80 int pa_sample_spec_valid(const pa_sample_spec *spec) {
  81     pa_assert(spec);
  82
  83     if (spec->rate <= 0 ||
  84         spec->rate > PA_RATE_MAX ||
  85         spec->channels <= 0 ||
  86         spec->channels > PA_CHANNELS_MAX ||
  87         spec->format >= PA_SAMPLE_MAX ||
  88         spec->format < 0)
  89         return 0;
  90
  91     return 1;
  92 }
  93
  94 int pa_sample_spec_equal(const pa_sample_spec*a, const pa_sample_spec*b) {
  95     pa_assert(a);
  96     pa_assert(b);
  97
  98     return (a->format == b->format) && (a->rate == b->rate) && (a->channels == b->channels);
  99 }
 100
 101 const char *pa_sample_format_to_string(pa_sample_format_t f) {
 102     static const char* const table[]= {
 103         [PA_SAMPLE_U8] = "u8",
 104         [PA_SAMPLE_ALAW] = "aLaw",
 105         [PA_SAMPLE_ULAW] = "uLaw",
 106         [PA_SAMPLE_S16LE] = "s16le",
 107         [PA_SAMPLE_S16BE] = "s16be",
 108         [PA_SAMPLE_FLOAT32LE] = "float32le",
 109         [PA_SAMPLE_FLOAT32BE] = "float32be",
 110     };
 111
 112     if (f < 0 || f >= PA_SAMPLE_MAX)
 113         return NULL;
 114
 115     return table[f];
 116 }
 117
 118 char *pa_sample_spec_snprint(char *s, size_t l, const pa_sample_spec *spec) {
 119     pa_assert(s);
 120     pa_assert(l);
 121     pa_assert(spec);
 122
 123     if (!pa_sample_spec_valid(spec))
 124         pa_snprintf(s, l, "Invalid");
 125     else
 126         pa_snprintf(s, l, "%s %uch %uHz", pa_sample_format_to_string(spec->format), spec->channels, spec->rate);
 127
 128     return s;
 129 }
 130
 131 char* pa_bytes_snprint(char *s, size_t l, unsigned v) {
 132     pa_assert(s);
 133
 134     if (v >= ((unsigned) 1024)*1024*1024)
 135         pa_snprintf(s, l, "%0.1f GiB", ((double) v)/1024/1024/1024);
 136     else if (v >= ((unsigned) 1024)*1024)
 137         pa_snprintf(s, l, "%0.1f MiB", ((double) v)/1024/1024);
 138     else if (v >= (unsigned) 1024)
 139         pa_snprintf(s, l, "%0.1f KiB", ((double) v)/1024);
 140     else
 141         pa_snprintf(s, l, "%u B", (unsigned) v);
 142
 143     return s;
 144 }
 145
 146 pa_sample_format_t pa_parse_sample_format(const char *format) {
 147     pa_assert(format);
 148
 149     if (strcasecmp(format, "s16le") == 0)
 150         return PA_SAMPLE_S16LE;
 151     else if (strcasecmp(format, "s16be") == 0)
 152         return PA_SAMPLE_S16BE;
 153     else if (strcasecmp(format, "s16ne") == 0 || strcasecmp(format, "s16") == 0 || strcasecmp(format, "16") == 0)
 154         return PA_SAMPLE_S16NE;
 155     else if (strcasecmp(format, "s16re") == 0)
 156         return PA_SAMPLE_S16RE;
 157     else if (strcasecmp(format, "u8") == 0 || strcasecmp(format, "8") == 0)
 158         return PA_SAMPLE_U8;
 159     else if (strcasecmp(format, "float32") == 0 || strcasecmp(format, "float32ne") == 0)
 160         return PA_SAMPLE_FLOAT32NE;
 161     else if (strcasecmp(format, "float32re") == 0)
 162         return PA_SAMPLE_FLOAT32RE;
 163     else if (strcasecmp(format, "float32le") == 0)
 164         return PA_SAMPLE_FLOAT32LE;
 165     else if (strcasecmp(format, "float32be") == 0)
 166         return PA_SAMPLE_FLOAT32BE;
 167     else if (strcasecmp(format, "ulaw") == 0 || strcasecmp(format, "mulaw") == 0)
 168         return PA_SAMPLE_ULAW;
 169     else if (strcasecmp(format, "alaw") == 0)
 170         return PA_SAMPLE_ALAW;
 171
 172     return -1;
 173 }