code.delx.au - pulseaudio/blob - polyp/sample.h

   1 #ifndef foosamplehfoo
   2 #define foosamplehfoo
   3
   4 /* $Id$ */
   5
   6 /***
   7   This file is part of polypaudio.
   8
   9   polypaudio is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU 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   polypaudio 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 General Public License
  20   along with polypaudio; if not, write to the Free Software
  21   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22   USA.
  23 ***/
  24
  25 #include <inttypes.h>
  26 #include <sys/types.h>
  27
  28 #include "cdecl.h"
  29
  30 PA_C_DECL_BEGIN
  31
  32 enum pa_sample_format {
  33     PA_SAMPLE_U8,
  34     PA_SAMPLE_ALAW,
  35     PA_SAMPLE_ULAW,
  36     PA_SAMPLE_S16LE,
  37     PA_SAMPLE_S16BE,
  38     PA_SAMPLE_FLOAT32LE,
  39     PA_SAMPLE_FLOAT32BE,
  40     PA_SAMPLE_MAX
  41 };
  42
  43 #ifdef WORDS_BIGENDIAN
  44 #define PA_SAMPLE_S16NE PA_SAMPLE_S16BE
  45 #define PA_SAMPLE_FLOAT32NE PA_SAMPLE_FLOAT32BE
  46 #else
  47 #define PA_SAMPLE_S16NE PA_SAMPLE_S16LE
  48 #define PA_SAMPLE_FLOAT32NE PA_SAMPLE_FLOAT32LE
  49 #endif
  50 #define PA_SAMPLE_FLOAT32 PA_SAMPLE_FLOAT32NE
  51
  52 /** A sample format and attribute specification */
  53 struct pa_sample_spec {
  54     enum pa_sample_format format;  /**< The sample format */
  55     uint32_t rate;                 /**< The sample rate. (e.g. 44100) */
  56     uint8_t channels;              /**< Audio channels. (1 for mono, 2 for stereo, ...) */
  57 };
  58
  59 size_t pa_bytes_per_second(const struct pa_sample_spec *spec);
  60 size_t pa_frame_size(const struct pa_sample_spec *spec);
  61 uint32_t pa_bytes_to_usec(size_t length, const struct pa_sample_spec *spec);
  62 int pa_sample_spec_valid(const struct pa_sample_spec *spec);
  63 int pa_sample_spec_equal(const struct pa_sample_spec*a, const struct pa_sample_spec*b);
  64
  65 #define PA_SAMPLE_SNPRINT_MAX_LENGTH 32
  66 void pa_sample_snprint(char *s, size_t l, const struct pa_sample_spec *spec);
  67
  68 /** Normal volume (100%) */
  69 #define PA_VOLUME_NORM (0x100)
  70
  71 /** Muted volume (0%) */
  72 #define PA_VOLUME_MUTE (0)
  73
  74 /** Multiply two volumes specifications, return the result. This uses PA_VOLUME_NORM as neutral element of multiplication. */
  75 uint32_t pa_volume_multiply(uint32_t a, uint32_t b);
  76
  77 PA_C_DECL_END
  78
  79 #endif