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 const char *pa_sample_format_to_string(enum pa_sample_format f) {
  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 (f >= PA_SAMPLE_MAX)
  99         return NULL;
 100
 101     return table[f];
 102 }
 103
 104 void pa_sample_spec_snprint(char *s, size_t l, const struct pa_sample_spec *spec) {
 105     assert(s && l && spec);
 106
 107     if (!pa_sample_spec_valid(spec)) {
 108         snprintf(s, l, "Invalid");
 109         return;
 110     }
 111
 112     snprintf(s, l, "%s %uch %uHz", pa_sample_format_to_string(spec->format), spec->channels, spec->rate);
 113 }
 114
 115 pa_volume_t pa_volume_multiply(pa_volume_t a, pa_volume_t b) {
 116     uint64_t p = a;
 117     p *= b;
 118     p /= PA_VOLUME_NORM;
 119
 120     return (pa_volume_t) p;
 121 }
 122
 123 pa_volume_t pa_volume_from_dB(double f) {
 124     if (f <= PA_DECIBEL_MININFTY)
 125         return PA_VOLUME_MUTED;
 126
 127     return (pa_volume_t) (pow(10, f/20)*PA_VOLUME_NORM);
 128 }
 129
 130 double pa_volume_to_dB(pa_volume_t v) {
 131     if (v == PA_VOLUME_MUTED)
 132         return PA_DECIBEL_MININFTY;
 133
 134     return 20*log10((double) v/PA_VOLUME_NORM);
 135 }
 136
 137 #define USER_DECIBEL_RANGE 30
 138
 139 double pa_volume_to_user(pa_volume_t v) {
 140     double dB = pa_volume_to_dB(v);
 141
 142     return dB < -USER_DECIBEL_RANGE ? 0 : dB/USER_DECIBEL_RANGE+1;
 143 }
 144
 145 pa_volume_t pa_volume_from_user(double v) {
 146
 147     if (v <= 0)
 148         return PA_VOLUME_MUTED;
 149
 150     return pa_volume_from_dB((v-1)*USER_DECIBEL_RANGE);
 151 }
 152
 153 void pa_bytes_snprint(char *s, size_t l, unsigned v) {
 154     if (v >= ((unsigned) 1024)*1024*1024)
 155         snprintf(s, l, "%0.1f GB", ((double) v)/1024/1024/1024);
 156     else if (v >= ((unsigned) 1024)*1024)
 157         snprintf(s, l, "%0.1f MB", ((double) v)/1024/1024);
 158     else if (v >= (unsigned) 1024)
 159         snprintf(s, l, "%0.1f KB", ((double) v)/1024);
 160     else
 161         snprintf(s, l, "%u B", (unsigned) v);
 162 }
 163
 164 enum pa_sample_format pa_parse_sample_format(const char *format) {
 165
 166     if (strcasecmp(format, "s16le") == 0)
 167         return PA_SAMPLE_S16LE;
 168     else if (strcasecmp(format, "s16be") == 0)
 169         return PA_SAMPLE_S16BE;
 170     else if (strcasecmp(format, "s16ne") == 0 || strcasecmp(format, "s16") == 0 || strcasecmp(format, "16") == 0)
 171         return PA_SAMPLE_S16NE;
 172     else if (strcasecmp(format, "u8") == 0 || strcasecmp(format, "8") == 0)
 173         return PA_SAMPLE_U8;
 174     else if (strcasecmp(format, "float32") == 0 || strcasecmp(format, "float32ne") == 0)
 175         return PA_SAMPLE_FLOAT32;
 176     else if (strcasecmp(format, "float32le") == 0)
 177         return PA_SAMPLE_FLOAT32LE;
 178     else if (strcasecmp(format, "float32be") == 0)
 179         return PA_SAMPLE_FLOAT32BE;
 180     else if (strcasecmp(format, "ulaw") == 0)
 181         return PA_SAMPLE_ULAW;
 182     else if (strcasecmp(format, "alaw") == 0)
 183         return PA_SAMPLE_ALAW;
 184
 185     return -1;
 186 }