code.delx.au - pulseaudio/blob - 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_frame_size(const struct pa_sample_spec *spec) {
  34     size_t b = 1;
  35     assert(spec);
  36
  37     switch (spec->format) {
  38         case PA_SAMPLE_U8:
  39         case PA_SAMPLE_ULAW:
  40         case PA_SAMPLE_ALAW:
  41             b = 1;
  42             break;
  43         case PA_SAMPLE_S16LE:
  44         case PA_SAMPLE_S16BE:
  45             b = 2;
  46             break;
  47         case PA_SAMPLE_FLOAT32LE:
  48         case PA_SAMPLE_FLOAT32BE:
  49             b = 4;
  50             break;
  51         default:
  52             assert(0);
  53     }
  54
  55     return b * spec->channels;
  56 }
  57
  58 size_t pa_bytes_per_second(const struct pa_sample_spec *spec) {
  59     assert(spec);
  60     return spec->rate*pa_frame_size(spec);
  61 }
  62
  63 pa_usec_t pa_bytes_to_usec(uint64_t length, const struct pa_sample_spec *spec) {
  64     assert(spec);
  65
  66     return (pa_usec_t) (((double) length/pa_frame_size(spec)*1000000)/spec->rate);
  67 }
  68
  69 int pa_sample_spec_valid(const struct pa_sample_spec *spec) {
  70     assert(spec);
  71
  72     if (spec->rate <= 0 || spec->channels <= 0)
  73         return 0;
  74
  75     if (spec->format >= PA_SAMPLE_MAX || spec->format < 0)
  76         return 0;
  77
  78     return 1;
  79 }
  80
  81 int pa_sample_spec_equal(const struct pa_sample_spec*a, const struct pa_sample_spec*b) {
  82     assert(a && b);
  83
  84     return (a->format == b->format) && (a->rate == b->rate) && (a->channels == b->channels);
  85 }
  86
  87 void pa_sample_spec_snprint(char *s, size_t l, const struct pa_sample_spec *spec) {
  88     static const char* const table[]= {
  89         [PA_SAMPLE_U8] = "U8",
  90         [PA_SAMPLE_ALAW] = "ALAW",
  91         [PA_SAMPLE_ULAW] = "ULAW",
  92         [PA_SAMPLE_S16LE] = "S16LE",
  93         [PA_SAMPLE_S16BE] = "S16BE",
  94         [PA_SAMPLE_FLOAT32LE] = "FLOAT32LE",
  95         [PA_SAMPLE_FLOAT32BE] = "FLOAT32BE",
  96     };
  97
  98     if (!pa_sample_spec_valid(spec)) {
  99         snprintf(s, l, "Invalid");
 100         return;
 101     }
 102
 103     snprintf(s, l, "%s %uch %uHz", table[spec->format], spec->channels, spec->rate);
 104 }
 105
 106 pa_volume_t pa_volume_multiply(pa_volume_t a, pa_volume_t b) {
 107     uint64_t p = a;
 108     p *= b;
 109     p /= PA_VOLUME_NORM;
 110
 111     return (pa_volume_t) p;
 112 }
 113
 114 pa_volume_t pa_volume_from_dB(double f) {
 115     if (f <= PA_DECIBEL_MININFTY)
 116         return PA_VOLUME_MUTED;
 117
 118     return (pa_volume_t) (pow(10, f/20)*PA_VOLUME_NORM);
 119 }
 120
 121 double pa_volume_to_dB(pa_volume_t v) {
 122     if (v == PA_VOLUME_MUTED)
 123         return PA_DECIBEL_MININFTY;
 124
 125     return 20*log10((double) v/PA_VOLUME_NORM);
 126 }
 127
 128 #define USER_DECIBEL_RANGE 30
 129
 130 double pa_volume_to_user(pa_volume_t v) {
 131     double dB = pa_volume_to_dB(v);
 132
 133     return dB < -USER_DECIBEL_RANGE ? 0 : dB/USER_DECIBEL_RANGE+1;
 134 }
 135
 136 pa_volume_t pa_volume_from_user(double v) {
 137
 138     if (v <= 0)
 139         return PA_VOLUME_MUTED;
 140
 141     return pa_volume_from_dB((v-1)*USER_DECIBEL_RANGE);
 142 }
 143
 144 void pa_bytes_snprint(char *s, size_t l, unsigned v) {
 145     if (v >= ((unsigned) 1024)*1024*1024)
 146         snprintf(s, l, "%0.1f GB", ((double) v)/1024/1024/1024);
 147     else if (v >= ((unsigned) 1024)*1024)
 148         snprintf(s, l, "%0.1f MB", ((double) v)/1024/1024);
 149     else if (v >= (unsigned) 1024)
 150         snprintf(s, l, "%0.1f KB", ((double) v)/1024);
 151     else
 152         snprintf(s, l, "%u B", (unsigned) v);
 153 }
 154
 155 enum pa_sample_format pa_parse_sample_format(const char *format) {
 156
 157     if (strcmp(format, "s16le") == 0)
 158         return PA_SAMPLE_S16LE;
 159     else if (strcmp(format, "s16be") == 0)
 160         return PA_SAMPLE_S16BE;
 161     else if (strcmp(format, "s16ne") == 0 || strcmp(format, "s16") == 0 || strcmp(format, "16") == 0)
 162         return PA_SAMPLE_S16NE;
 163     else if (strcmp(format, "u8") == 0 || strcmp(format, "8") == 0)
 164         return PA_SAMPLE_U8;
 165     else if (strcmp(format, "float32") == 0 || strcmp(format, "float32ne") == 0)
 166         return PA_SAMPLE_FLOAT32;
 167     else if (strcmp(format, "float32le") == 0)
 168         return PA_SAMPLE_FLOAT32LE;
 169     else if (strcmp(format, "float32be") == 0)
 170         return PA_SAMPLE_FLOAT32BE;
 171     else if (strcmp(format, "ulaw") == 0)
 172         return PA_SAMPLE_ULAW;
 173     else if (strcmp(format, "alaw") == 0)
 174         return PA_SAMPLE_ALAW;
 175
 176     return -1;
 177 }