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 <pulsecore/core-util.h>
  35 #include "sample.h"
  36
  37 size_t pa_sample_size(const pa_sample_spec *spec) {
  38     assert(spec);
  39
  40     switch (spec->format) {
  41         case PA_SAMPLE_U8:
  42         case PA_SAMPLE_ULAW:
  43         case PA_SAMPLE_ALAW:
  44             return 1;
  45         case PA_SAMPLE_S16LE:
  46         case PA_SAMPLE_S16BE:
  47             return 2;
  48         case PA_SAMPLE_FLOAT32LE:
  49         case PA_SAMPLE_FLOAT32BE:
  50             return 4;
  51         default:
  52             assert(0);
  53             return 0;
  54     }
  55 }
  56
  57 size_t pa_frame_size(const pa_sample_spec *spec) {
  58     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     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     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     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     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     assert(a && b);
  96
  97     return (a->format == b->format) && (a->rate == b->rate) && (a->channels == b->channels);
  98 }
  99
 100 const char *pa_sample_format_to_string(pa_sample_format_t f) {
 101     static const char* const table[]= {
 102         [PA_SAMPLE_U8] = "u8",
 103         [PA_SAMPLE_ALAW] = "aLaw",
 104         [PA_SAMPLE_ULAW] = "uLaw",
 105         [PA_SAMPLE_S16LE] = "s16le",
 106         [PA_SAMPLE_S16BE] = "s16be",
 107         [PA_SAMPLE_FLOAT32LE] = "float32le",
 108         [PA_SAMPLE_FLOAT32BE] = "float32be",
 109     };
 110
 111     if (f >= PA_SAMPLE_MAX)
 112         return NULL;
 113
 114     return table[f];
 115 }
 116
 117 char *pa_sample_spec_snprint(char *s, size_t l, const pa_sample_spec *spec) {
 118     assert(s && l && spec);
 119
 120     if (!pa_sample_spec_valid(spec))
 121         pa_snprintf(s, l, "Invalid");
 122     else
 123         pa_snprintf(s, l, "%s %uch %uHz", pa_sample_format_to_string(spec->format), spec->channels, spec->rate);
 124
 125     return s;
 126 }
 127
 128 char* pa_bytes_snprint(char *s, size_t l, unsigned v) {
 129     if (v >= ((unsigned) 1024)*1024*1024)
 130         pa_snprintf(s, l, "%0.1f GiB", ((double) v)/1024/1024/1024);
 131     else if (v >= ((unsigned) 1024)*1024)
 132         pa_snprintf(s, l, "%0.1f MiB", ((double) v)/1024/1024);
 133     else if (v >= (unsigned) 1024)
 134         pa_snprintf(s, l, "%0.1f KiB", ((double) v)/1024);
 135     else
 136         pa_snprintf(s, l, "%u B", (unsigned) v);
 137
 138     return s;
 139 }
 140
 141 pa_sample_format_t pa_parse_sample_format(const char *format) {
 142
 143     if (strcasecmp(format, "s16le") == 0)
 144         return PA_SAMPLE_S16LE;
 145     else if (strcasecmp(format, "s16be") == 0)
 146         return PA_SAMPLE_S16BE;
 147     else if (strcasecmp(format, "s16ne") == 0 || strcasecmp(format, "s16") == 0 || strcasecmp(format, "16") == 0)
 148         return PA_SAMPLE_S16NE;
 149     else if (strcasecmp(format, "u8") == 0 || strcasecmp(format, "8") == 0)
 150         return PA_SAMPLE_U8;
 151     else if (strcasecmp(format, "float32") == 0 || strcasecmp(format, "float32ne") == 0)
 152         return PA_SAMPLE_FLOAT32;
 153     else if (strcasecmp(format, "float32le") == 0)
 154         return PA_SAMPLE_FLOAT32LE;
 155     else if (strcasecmp(format, "float32be") == 0)
 156         return PA_SAMPLE_FLOAT32BE;
 157     else if (strcasecmp(format, "ulaw") == 0)
 158         return PA_SAMPLE_ULAW;
 159     else if (strcasecmp(format, "alaw") == 0)
 160         return PA_SAMPLE_ALAW;
 161
 162     return -1;
 163 }