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 <assert.h>
  31 #include <math.h>
  32 #include <string.h>
  33
  34 #include "sample.h"
  35
  36 size_t pa_sample_size(const pa_sample_spec *spec) {
  37     assert(spec);
  38
  39     switch (spec->format) {
  40         case PA_SAMPLE_U8:
  41         case PA_SAMPLE_ULAW:
  42         case PA_SAMPLE_ALAW:
  43             return 1;
  44         case PA_SAMPLE_S16LE:
  45         case PA_SAMPLE_S16BE:
  46             return 2;
  47         case PA_SAMPLE_FLOAT32LE:
  48         case PA_SAMPLE_FLOAT32BE:
  49             return 4;
  50         default:
  51             assert(0);
  52             return 0;
  53     }
  54 }
  55
  56 size_t pa_frame_size(const pa_sample_spec *spec) {
  57     assert(spec);
  58
  59     return pa_sample_size(spec) * spec->channels;
  60 }
  61
  62 size_t pa_bytes_per_second(const pa_sample_spec *spec) {
  63     assert(spec);
  64     return spec->rate*pa_frame_size(spec);
  65 }
  66
  67 pa_usec_t pa_bytes_to_usec(uint64_t length, const pa_sample_spec *spec) {
  68     assert(spec);
  69
  70     return (pa_usec_t) (((double) length/pa_frame_size(spec)*1000000)/spec->rate);
  71 }
  72
  73 size_t pa_usec_to_bytes(pa_usec_t t, const pa_sample_spec *spec) {
  74     assert(spec);
  75
  76     return (size_t) (((double) t * spec->rate / 1000000))*pa_frame_size(spec);
  77 }
  78
  79 int pa_sample_spec_valid(const pa_sample_spec *spec) {
  80     assert(spec);
  81
  82     if (spec->rate <= 0 ||
  83         spec->rate > PA_RATE_MAX ||
  84         spec->channels <= 0 ||
  85         spec->channels > PA_CHANNELS_MAX ||
  86         spec->format >= PA_SAMPLE_MAX ||
  87         spec->format < 0)
  88         return 0;
  89
  90     return 1;
  91 }
  92
  93 int pa_sample_spec_equal(const pa_sample_spec*a, const pa_sample_spec*b) {
  94     assert(a && b);
  95
  96     return (a->format == b->format) && (a->rate == b->rate) && (a->channels == b->channels);
  97 }
  98
  99 const char *pa_sample_format_to_string(pa_sample_format_t f) {
 100     static const char* const table[]= {
 101         [PA_SAMPLE_U8] = "u8",
 102         [PA_SAMPLE_ALAW] = "aLaw",
 103         [PA_SAMPLE_ULAW] = "uLaw",
 104         [PA_SAMPLE_S16LE] = "s16le",
 105         [PA_SAMPLE_S16BE] = "s16be",
 106         [PA_SAMPLE_FLOAT32LE] = "float32le",
 107         [PA_SAMPLE_FLOAT32BE] = "float32be",
 108     };
 109
 110     if (f >= PA_SAMPLE_MAX)
 111         return NULL;
 112
 113     return table[f];
 114 }
 115
 116 char *pa_sample_spec_snprint(char *s, size_t l, const pa_sample_spec *spec) {
 117     assert(s && l && spec);
 118
 119     if (!pa_sample_spec_valid(spec))
 120         snprintf(s, l, "Invalid");
 121     else
 122         snprintf(s, l, "%s %uch %uHz", pa_sample_format_to_string(spec->format), spec->channels, spec->rate);
 123
 124     return s;
 125 }
 126
 127 char* pa_bytes_snprint(char *s, size_t l, unsigned v) {
 128     if (v >= ((unsigned) 1024)*1024*1024)
 129         snprintf(s, l, "%0.1f GiB", ((double) v)/1024/1024/1024);
 130     else if (v >= ((unsigned) 1024)*1024)
 131         snprintf(s, l, "%0.1f MiB", ((double) v)/1024/1024);
 132     else if (v >= (unsigned) 1024)
 133         snprintf(s, l, "%0.1f KiB", ((double) v)/1024);
 134     else
 135         snprintf(s, l, "%u B", (unsigned) v);
 136
 137     return s;
 138 }
 139
 140 pa_sample_format_t pa_parse_sample_format(const char *format) {
 141
 142     if (strcasecmp(format, "s16le") == 0)
 143         return PA_SAMPLE_S16LE;
 144     else if (strcasecmp(format, "s16be") == 0)
 145         return PA_SAMPLE_S16BE;
 146     else if (strcasecmp(format, "s16ne") == 0 || strcasecmp(format, "s16") == 0 || strcasecmp(format, "16") == 0)
 147         return PA_SAMPLE_S16NE;
 148     else if (strcasecmp(format, "u8") == 0 || strcasecmp(format, "8") == 0)
 149         return PA_SAMPLE_U8;
 150     else if (strcasecmp(format, "float32") == 0 || strcasecmp(format, "float32ne") == 0)
 151         return PA_SAMPLE_FLOAT32;
 152     else if (strcasecmp(format, "float32le") == 0)
 153         return PA_SAMPLE_FLOAT32LE;
 154     else if (strcasecmp(format, "float32be") == 0)
 155         return PA_SAMPLE_FLOAT32BE;
 156     else if (strcasecmp(format, "ulaw") == 0)
 157         return PA_SAMPLE_ULAW;
 158     else if (strcasecmp(format, "alaw") == 0)
 159         return PA_SAMPLE_ALAW;
 160
 161     return -1;
 162 }