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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with polypaudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27 #include <assert.h>
  28 #include <math.h>
  29 #include <string.h>
  30
  31 #include "sample.h"
  32
  33 size_t pa_sample_size(const pa_sample_spec *spec) {
  34     assert(spec);
  35
  36     switch (spec->format) {
  37         case PA_SAMPLE_U8:
  38         case PA_SAMPLE_ULAW:
  39         case PA_SAMPLE_ALAW:
  40             return 1;
  41         case PA_SAMPLE_S16LE:
  42         case PA_SAMPLE_S16BE:
  43             return 2;
  44         case PA_SAMPLE_FLOAT32LE:
  45         case PA_SAMPLE_FLOAT32BE:
  46             return 4;
  47         default:
  48             assert(0);
  49             return 0;
  50     }
  51 }
  52
  53 size_t pa_frame_size(const pa_sample_spec *spec) {
  54     assert(spec);
  55
  56     return pa_sample_size(spec) * spec->channels;
  57 }
  58
  59 size_t pa_bytes_per_second(const pa_sample_spec *spec) {
  60     assert(spec);
  61     return spec->rate*pa_frame_size(spec);
  62 }
  63
  64 pa_usec_t pa_bytes_to_usec(uint64_t length, const pa_sample_spec *spec) {
  65     assert(spec);
  66
  67     return (pa_usec_t) (((double) length/pa_frame_size(spec)*1000000)/spec->rate);
  68 }
  69
  70 size_t pa_usec_to_bytes(pa_usec_t t, const pa_sample_spec *spec) {
  71     assert(spec);
  72
  73     return ((double) t * spec->rate / 1000000)*pa_frame_size(spec);
  74 }
  75
  76 int pa_sample_spec_valid(const pa_sample_spec *spec) {
  77     assert(spec);
  78
  79     if (spec->rate <= 0 ||
  80         spec->channels <= 0 ||
  81         spec->channels > PA_CHANNELS_MAX ||
  82         spec->format >= PA_SAMPLE_MAX ||
  83         spec->format < 0)
  84         return 0;
  85
  86     return 1;
  87 }
  88
  89 int pa_sample_spec_equal(const pa_sample_spec*a, const pa_sample_spec*b) {
  90     assert(a && b);
  91
  92     return (a->format == b->format) && (a->rate == b->rate) && (a->channels == b->channels);
  93 }
  94
  95 const char *pa_sample_format_to_string(pa_sample_format_t f) {
  96     static const char* const table[]= {
  97         [PA_SAMPLE_U8] = "u8",
  98         [PA_SAMPLE_ALAW] = "aLaw",
  99         [PA_SAMPLE_ULAW] = "uLaw",
 100         [PA_SAMPLE_S16LE] = "s16le",
 101         [PA_SAMPLE_S16BE] = "s16be",
 102         [PA_SAMPLE_FLOAT32LE] = "float32le",
 103         [PA_SAMPLE_FLOAT32BE] = "float32be",
 104     };
 105
 106     if (f >= PA_SAMPLE_MAX)
 107         return NULL;
 108
 109     return table[f];
 110 }
 111
 112 char *pa_sample_spec_snprint(char *s, size_t l, const pa_sample_spec *spec) {
 113     assert(s && l && spec);
 114
 115     if (!pa_sample_spec_valid(spec))
 116         snprintf(s, l, "Invalid");
 117     else
 118         snprintf(s, l, "%s %uch %uHz", pa_sample_format_to_string(spec->format), spec->channels, spec->rate);
 119
 120     return s;
 121 }
 122
 123 void pa_bytes_snprint(char *s, size_t l, unsigned v) {
 124     if (v >= ((unsigned) 1024)*1024*1024)
 125         snprintf(s, l, "%0.1f GiB", ((double) v)/1024/1024/1024);
 126     else if (v >= ((unsigned) 1024)*1024)
 127         snprintf(s, l, "%0.1f MiB", ((double) v)/1024/1024);
 128     else if (v >= (unsigned) 1024)
 129         snprintf(s, l, "%0.1f KiB", ((double) v)/1024);
 130     else
 131         snprintf(s, l, "%u B", (unsigned) v);
 132 }
 133
 134 pa_sample_format_t pa_parse_sample_format(const char *format) {
 135
 136     if (strcasecmp(format, "s16le") == 0)
 137         return PA_SAMPLE_S16LE;
 138     else if (strcasecmp(format, "s16be") == 0)
 139         return PA_SAMPLE_S16BE;
 140     else if (strcasecmp(format, "s16ne") == 0 || strcasecmp(format, "s16") == 0 || strcasecmp(format, "16") == 0)
 141         return PA_SAMPLE_S16NE;
 142     else if (strcasecmp(format, "u8") == 0 || strcasecmp(format, "8") == 0)
 143         return PA_SAMPLE_U8;
 144     else if (strcasecmp(format, "float32") == 0 || strcasecmp(format, "float32ne") == 0)
 145         return PA_SAMPLE_FLOAT32;
 146     else if (strcasecmp(format, "float32le") == 0)
 147         return PA_SAMPLE_FLOAT32LE;
 148     else if (strcasecmp(format, "float32be") == 0)
 149         return PA_SAMPLE_FLOAT32BE;
 150     else if (strcasecmp(format, "ulaw") == 0)
 151         return PA_SAMPLE_ULAW;
 152     else if (strcasecmp(format, "alaw") == 0)
 153         return PA_SAMPLE_ALAW;
 154
 155     return -1;
 156 }