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 ||
  73         spec->channels <= 0 ||
  74         spec->channels >= PA_CHANNELS_MAX ||
  75         spec->format >= PA_SAMPLE_MAX ||
  76         spec->format < 0)
  77         return 0;
  78
  79     return 1;
  80 }
  81
  82 int pa_sample_spec_equal(const struct pa_sample_spec*a, const struct pa_sample_spec*b) {
  83     assert(a && b);
  84
  85     return (a->format == b->format) && (a->rate == b->rate) && (a->channels == b->channels);
  86 }
  87
  88 const char *pa_sample_format_to_string(enum pa_sample_format f) {
  89     static const char* const table[]= {
  90         [PA_SAMPLE_U8] = "u8",
  91         [PA_SAMPLE_ALAW] = "aLaw",
  92         [PA_SAMPLE_ULAW] = "uLaw",
  93         [PA_SAMPLE_S16LE] = "s16le",
  94         [PA_SAMPLE_S16BE] = "s16be",
  95         [PA_SAMPLE_FLOAT32LE] = "float32le",
  96         [PA_SAMPLE_FLOAT32BE] = "float32be",
  97     };
  98
  99     if (f >= PA_SAMPLE_MAX)
 100         return NULL;
 101
 102     return table[f];
 103 }
 104
 105 char *pa_sample_spec_snprint(char *s, size_t l, const struct pa_sample_spec *spec) {
 106     assert(s && l && spec);
 107
 108     if (!pa_sample_spec_valid(spec))
 109         snprintf(s, l, "Invalid");
 110     else
 111         snprintf(s, l, "%s %uch %uHz", pa_sample_format_to_string(spec->format), spec->channels, spec->rate);
 112
 113     return s;
 114 }
 115
 116
 117 void pa_bytes_snprint(char *s, size_t l, unsigned v) {
 118     if (v >= ((unsigned) 1024)*1024*1024)
 119         snprintf(s, l, "%0.1f GB", ((double) v)/1024/1024/1024);
 120     else if (v >= ((unsigned) 1024)*1024)
 121         snprintf(s, l, "%0.1f MB", ((double) v)/1024/1024);
 122     else if (v >= (unsigned) 1024)
 123         snprintf(s, l, "%0.1f KB", ((double) v)/1024);
 124     else
 125         snprintf(s, l, "%u B", (unsigned) v);
 126 }
 127
 128 enum pa_sample_format pa_parse_sample_format(const char *format) {
 129
 130     if (strcasecmp(format, "s16le") == 0)
 131         return PA_SAMPLE_S16LE;
 132     else if (strcasecmp(format, "s16be") == 0)
 133         return PA_SAMPLE_S16BE;
 134     else if (strcasecmp(format, "s16ne") == 0 || strcasecmp(format, "s16") == 0 || strcasecmp(format, "16") == 0)
 135         return PA_SAMPLE_S16NE;
 136     else if (strcasecmp(format, "u8") == 0 || strcasecmp(format, "8") == 0)
 137         return PA_SAMPLE_U8;
 138     else if (strcasecmp(format, "float32") == 0 || strcasecmp(format, "float32ne") == 0)
 139         return PA_SAMPLE_FLOAT32;
 140     else if (strcasecmp(format, "float32le") == 0)
 141         return PA_SAMPLE_FLOAT32LE;
 142     else if (strcasecmp(format, "float32be") == 0)
 143         return PA_SAMPLE_FLOAT32BE;
 144     else if (strcasecmp(format, "ulaw") == 0)
 145         return PA_SAMPLE_ULAW;
 146     else if (strcasecmp(format, "alaw") == 0)
 147         return PA_SAMPLE_ALAW;
 148
 149     return -1;
 150 }