src/lpcm.h

   1 /*
   2  * Copyright (C) 2013 nu774
   3  * For conditions of distribution and use, see copyright notice in COPYING
   4  */
   5 #ifndef LPCM_H
   6 #define LPCM_H
   7
   8 enum pcm_type {
   9     PCM_TYPE_UNKNOWN = 0,
  10     PCM_TYPE_SINT = 1,
  11     PCM_TYPE_UINT = 2,
  12     PCM_TYPE_FLOAT = 4,
  13     PCM_TYPE_SINT_BE = (8|1),
  14     PCM_TYPE_UINT_BE = (8|2),
  15     PCM_TYPE_FLOAT_BE = (8|4),
  16 };
  17
  18 typedef struct pcm_sample_description_t {
  19     enum pcm_type sample_type;
  20     uint32_t sample_rate;
  21     uint8_t bits_per_channel;
  22     uint8_t bytes_per_frame;
  23     uint8_t channels_per_frame;
  24     uint32_t channel_mask;
  25 } pcm_sample_description_t;
  26
  27 #define PCM_IS_SINT(desc) ((desc)->sample_type & 1)
  28 #define PCM_IS_UINT(desc) ((desc)->sample_type & 2)
  29 #define PCM_IS_FLOAT(desc) ((desc)->sample_type & 4)
  30 #define PCM_IS_BIG_ENDIAN(desc) ((desc)->sample_type & 8)
  31 #define PCM_BYTES_PER_CHANNEL(desc) \
  32     ((desc)->bytes_per_frame / (desc)->channels_per_frame)
  33
  34 #if defined(_MSC_VER) && _MSC_VER < 1800
  35 #  ifdef _M_IX86
  36 static inline int lrint(double x)
  37 {
  38     int n;
  39     _asm {
  40         fld x
  41         fistp n
  42     }
  43     return n;
  44 }
  45 #  else
  46 #    include <emmintrin.h>
  47 static inline int lrint(double x)
  48 {
  49     return _mm_cvtsd_si32(_mm_load_sd(&x));
  50 }
  51 #  endif
  52 #endif
  53
  54 static
  55 inline double pcm_clip(double n, double min_value, double max_value)
  56 {
  57     if (n < min_value)
  58         return min_value;
  59     else if (n > max_value)
  60         return max_value;
  61     return n;
  62 }
  63
  64 int pcm_convert_to_native_sint16(const pcm_sample_description_t *format,
  65                                  const void *input, uint32_t nframes,
  66                                  int16_t *result);
  67 #endif