SDL  2.0
SDL_audiotypecvt.c File Reference
#include "../SDL_internal.h"
#include "SDL_audio.h"
#include "SDL_audio_c.h"
#include "SDL_cpuinfo.h"
#include "SDL_assert.h"
+ Include dependency graph for SDL_audiotypecvt.c:

Go to the source code of this file.

Macros

#define HAVE_NEON_INTRINSICS   0
 
#define NEED_SCALAR_CONVERTER_FALLBACKS   1
 
#define DIVBY128   0.0078125f
 
#define DIVBY32768   0.000030517578125f
 
#define DIVBY2147483648   0.00000000046566128730773926
 
#define SET_CONVERTER_FUNCS(fntype)
 

Functions

static void SDL_Convert_S8_to_F32_Scalar (SDL_AudioCVT *cvt, SDL_AudioFormat format)
 
static void SDL_Convert_U8_to_F32_Scalar (SDL_AudioCVT *cvt, SDL_AudioFormat format)
 
static void SDL_Convert_S16_to_F32_Scalar (SDL_AudioCVT *cvt, SDL_AudioFormat format)
 
static void SDL_Convert_U16_to_F32_Scalar (SDL_AudioCVT *cvt, SDL_AudioFormat format)
 
static void SDL_Convert_S32_to_F32_Scalar (SDL_AudioCVT *cvt, SDL_AudioFormat format)
 
static void SDL_Convert_F32_to_S8_Scalar (SDL_AudioCVT *cvt, SDL_AudioFormat format)
 
static void SDL_Convert_F32_to_U8_Scalar (SDL_AudioCVT *cvt, SDL_AudioFormat format)
 
static void SDL_Convert_F32_to_S16_Scalar (SDL_AudioCVT *cvt, SDL_AudioFormat format)
 
static void SDL_Convert_F32_to_U16_Scalar (SDL_AudioCVT *cvt, SDL_AudioFormat format)
 
static void SDL_Convert_F32_to_S32_Scalar (SDL_AudioCVT *cvt, SDL_AudioFormat format)
 
void SDL_ChooseAudioConverters (void)
 

Variables

SDL_AudioFilter SDL_Convert_S8_to_F32 = NULL
 
SDL_AudioFilter SDL_Convert_U8_to_F32 = NULL
 
SDL_AudioFilter SDL_Convert_S16_to_F32 = NULL
 
SDL_AudioFilter SDL_Convert_U16_to_F32 = NULL
 
SDL_AudioFilter SDL_Convert_S32_to_F32 = NULL
 
SDL_AudioFilter SDL_Convert_F32_to_S8 = NULL
 
SDL_AudioFilter SDL_Convert_F32_to_U8 = NULL
 
SDL_AudioFilter SDL_Convert_F32_to_S16 = NULL
 
SDL_AudioFilter SDL_Convert_F32_to_U16 = NULL
 
SDL_AudioFilter SDL_Convert_F32_to_S32 = NULL
 

Macro Definition Documentation

#define DIVBY128   0.0078125f
#define DIVBY2147483648   0.00000000046566128730773926

Definition at line 65 of file SDL_audiotypecvt.c.

Referenced by SDL_Convert_S32_to_F32_Scalar().

#define DIVBY32768   0.000030517578125f
#define HAVE_NEON_INTRINSICS   0

Definition at line 29 of file SDL_audiotypecvt.c.

#define NEED_SCALAR_CONVERTER_FALLBACKS   1

Definition at line 47 of file SDL_audiotypecvt.c.

#define SET_CONVERTER_FUNCS (   fntype)
Value:
SDL_Convert_S8_to_F32 = SDL_Convert_S8_to_F32_##fntype; \
SDL_Convert_U8_to_F32 = SDL_Convert_U8_to_F32_##fntype; \
SDL_Convert_S16_to_F32 = SDL_Convert_S16_to_F32_##fntype; \
SDL_Convert_U16_to_F32 = SDL_Convert_U16_to_F32_##fntype; \
SDL_Convert_S32_to_F32 = SDL_Convert_S32_to_F32_##fntype; \
SDL_Convert_F32_to_S8 = SDL_Convert_F32_to_S8_##fntype; \
SDL_Convert_F32_to_U8 = SDL_Convert_F32_to_U8_##fntype; \
SDL_Convert_F32_to_S16 = SDL_Convert_F32_to_S16_##fntype; \
SDL_Convert_F32_to_U16 = SDL_Convert_F32_to_U16_##fntype; \
SDL_Convert_F32_to_S32 = SDL_Convert_F32_to_S32_##fntype; \
converters_chosen = SDL_TRUE
SDL_AudioFilter SDL_Convert_F32_to_U16
SDL_AudioFilter SDL_Convert_F32_to_S16
SDL_AudioFilter SDL_Convert_U8_to_F32
int(* fntype)(const char *)
Definition: testloadso.c:22
SDL_AudioFilter SDL_Convert_F32_to_U8
SDL_AudioFilter SDL_Convert_S16_to_F32
SDL_AudioFilter SDL_Convert_S8_to_F32
SDL_AudioFilter SDL_Convert_F32_to_S32
SDL_AudioFilter SDL_Convert_F32_to_S8
SDL_AudioFilter SDL_Convert_U16_to_F32
SDL_AudioFilter SDL_Convert_S32_to_F32

Referenced by SDL_ChooseAudioConverters().

Function Documentation

void SDL_ChooseAudioConverters ( void  )

Definition at line 747 of file SDL_audiotypecvt.c.

References SDL_assert, SDL_FALSE, SDL_HasSSE2, SDL_TRUE, and SET_CONVERTER_FUNCS.

Referenced by SDL_BuildAudioCVT().

748 {
749  static SDL_bool converters_chosen = SDL_FALSE;
750 
751  if (converters_chosen) {
752  return;
753  }
754 
755 #define SET_CONVERTER_FUNCS(fntype) \
756  SDL_Convert_S8_to_F32 = SDL_Convert_S8_to_F32_##fntype; \
757  SDL_Convert_U8_to_F32 = SDL_Convert_U8_to_F32_##fntype; \
758  SDL_Convert_S16_to_F32 = SDL_Convert_S16_to_F32_##fntype; \
759  SDL_Convert_U16_to_F32 = SDL_Convert_U16_to_F32_##fntype; \
760  SDL_Convert_S32_to_F32 = SDL_Convert_S32_to_F32_##fntype; \
761  SDL_Convert_F32_to_S8 = SDL_Convert_F32_to_S8_##fntype; \
762  SDL_Convert_F32_to_U8 = SDL_Convert_F32_to_U8_##fntype; \
763  SDL_Convert_F32_to_S16 = SDL_Convert_F32_to_S16_##fntype; \
764  SDL_Convert_F32_to_U16 = SDL_Convert_F32_to_U16_##fntype; \
765  SDL_Convert_F32_to_S32 = SDL_Convert_F32_to_S32_##fntype; \
766  converters_chosen = SDL_TRUE
767 
768 #if HAVE_SSE2_INTRINSICS
769  if (SDL_HasSSE2()) {
770  SET_CONVERTER_FUNCS(SSE2);
771  return;
772  }
773 #endif
774 
775 #if NEED_SCALAR_CONVERTER_FALLBACKS
776  SET_CONVERTER_FUNCS(Scalar);
777 #endif
778 
779 #undef SET_CONVERTER_FUNCS
780 
781  SDL_assert(converters_chosen == SDL_TRUE);
782 }
#define SDL_assert(condition)
Definition: SDL_assert.h:169
SDL_bool
Definition: SDL_stdinc.h:139
#define SDL_HasSSE2
#define SET_CONVERTER_FUNCS(fntype)
static void SDL_Convert_F32_to_S16_Scalar ( SDL_AudioCVT cvt,
SDL_AudioFormat  format 
)
static

Definition at line 202 of file SDL_audiotypecvt.c.

References AUDIO_S16SYS, SDL_AudioCVT::buf, SDL_AudioCVT::filter_index, SDL_AudioCVT::filters, i, SDL_AudioCVT::len_cvt, and LOG_DEBUG_CONVERT.

203 {
204  const float *src = (const float *) cvt->buf;
205  Sint16 *dst = (Sint16 *) cvt->buf;
206  int i;
207 
208  LOG_DEBUG_CONVERT("AUDIO_F32", "AUDIO_S16");
209 
210  for (i = cvt->len_cvt / sizeof (float); i; --i, ++src, ++dst) {
211  *dst = (Sint16) (*src * 32767.0f);
212  }
213 
214  cvt->len_cvt /= 2;
215  if (cvt->filters[++cvt->filter_index]) {
216  cvt->filters[cvt->filter_index](cvt, AUDIO_S16SYS);
217  }
218 }
#define LOG_DEBUG_CONVERT(from, to)
Definition: SDL_audio_c.h:34
GLenum GLenum dst
Uint8 * buf
Definition: SDL_audio.h:222
int filter_index
Definition: SDL_audio.h:228
GLfloat f
GLenum src
#define AUDIO_S16SYS
Definition: SDL_audio.h:123
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
SDL_AudioFilter filters[SDL_AUDIOCVT_MAX_FILTERS+1]
Definition: SDL_audio.h:227
int16_t Sint16
Definition: SDL_stdinc.h:163
static void SDL_Convert_F32_to_S32_Scalar ( SDL_AudioCVT cvt,
SDL_AudioFormat  format 
)
static

Definition at line 240 of file SDL_audiotypecvt.c.

References AUDIO_S32SYS, SDL_AudioCVT::buf, SDL_AudioCVT::filter_index, SDL_AudioCVT::filters, i, SDL_AudioCVT::len_cvt, and LOG_DEBUG_CONVERT.

241 {
242  const float *src = (const float *) cvt->buf;
243  Sint32 *dst = (Sint32 *) cvt->buf;
244  int i;
245 
246  LOG_DEBUG_CONVERT("AUDIO_F32", "AUDIO_S32");
247 
248  for (i = cvt->len_cvt / sizeof (float); i; --i, ++src, ++dst) {
249  *dst = (Sint32) (((double) *src) * 2147483647.0);
250  }
251 
252  if (cvt->filters[++cvt->filter_index]) {
253  cvt->filters[cvt->filter_index](cvt, AUDIO_S32SYS);
254  }
255 }
#define LOG_DEBUG_CONVERT(from, to)
Definition: SDL_audio_c.h:34
GLenum GLenum dst
Uint8 * buf
Definition: SDL_audio.h:222
int filter_index
Definition: SDL_audio.h:228
GLenum src
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
SDL_AudioFilter filters[SDL_AUDIOCVT_MAX_FILTERS+1]
Definition: SDL_audio.h:227
int32_t Sint32
Definition: SDL_stdinc.h:175
#define AUDIO_S32SYS
Definition: SDL_audio.h:124
static void SDL_Convert_F32_to_S8_Scalar ( SDL_AudioCVT cvt,
SDL_AudioFormat  format 
)
static

Definition at line 164 of file SDL_audiotypecvt.c.

References AUDIO_S8, SDL_AudioCVT::buf, SDL_AudioCVT::filter_index, SDL_AudioCVT::filters, i, SDL_AudioCVT::len_cvt, and LOG_DEBUG_CONVERT.

165 {
166  const float *src = (const float *) cvt->buf;
167  Sint8 *dst = (Sint8 *) cvt->buf;
168  int i;
169 
170  LOG_DEBUG_CONVERT("AUDIO_F32", "AUDIO_S8");
171 
172  for (i = cvt->len_cvt / sizeof (float); i; --i, ++src, ++dst) {
173  *dst = (Sint8) (*src * 127.0f);
174  }
175 
176  cvt->len_cvt /= 4;
177  if (cvt->filters[++cvt->filter_index]) {
178  cvt->filters[cvt->filter_index](cvt, AUDIO_S8);
179  }
180 }
#define LOG_DEBUG_CONVERT(from, to)
Definition: SDL_audio_c.h:34
GLenum GLenum dst
Uint8 * buf
Definition: SDL_audio.h:222
int filter_index
Definition: SDL_audio.h:228
GLfloat f
GLenum src
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
SDL_AudioFilter filters[SDL_AUDIOCVT_MAX_FILTERS+1]
Definition: SDL_audio.h:227
int8_t Sint8
Definition: SDL_stdinc.h:151
#define AUDIO_S8
Definition: SDL_audio.h:90
static void SDL_Convert_F32_to_U16_Scalar ( SDL_AudioCVT cvt,
SDL_AudioFormat  format 
)
static

Definition at line 221 of file SDL_audiotypecvt.c.

References AUDIO_U16SYS, SDL_AudioCVT::buf, SDL_AudioCVT::filter_index, SDL_AudioCVT::filters, i, SDL_AudioCVT::len_cvt, and LOG_DEBUG_CONVERT.

222 {
223  const float *src = (const float *) cvt->buf;
224  Uint16 *dst = (Uint16 *) cvt->buf;
225  int i;
226 
227  LOG_DEBUG_CONVERT("AUDIO_F32", "AUDIO_U16");
228 
229  for (i = cvt->len_cvt / sizeof (float); i; --i, ++src, ++dst) {
230  *dst = (Uint16) ((*src + 1.0f) * 32767.0f);
231  }
232 
233  cvt->len_cvt /= 2;
234  if (cvt->filters[++cvt->filter_index]) {
235  cvt->filters[cvt->filter_index](cvt, AUDIO_U16SYS);
236  }
237 }
#define LOG_DEBUG_CONVERT(from, to)
Definition: SDL_audio_c.h:34
GLenum GLenum dst
Uint8 * buf
Definition: SDL_audio.h:222
int filter_index
Definition: SDL_audio.h:228
GLfloat f
GLenum src
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
SDL_AudioFilter filters[SDL_AUDIOCVT_MAX_FILTERS+1]
Definition: SDL_audio.h:227
uint16_t Uint16
Definition: SDL_stdinc.h:169
#define AUDIO_U16SYS
Definition: SDL_audio.h:122
static void SDL_Convert_F32_to_U8_Scalar ( SDL_AudioCVT cvt,
SDL_AudioFormat  format 
)
static

Definition at line 183 of file SDL_audiotypecvt.c.

References AUDIO_U8, SDL_AudioCVT::buf, SDL_AudioCVT::filter_index, SDL_AudioCVT::filters, i, SDL_AudioCVT::len_cvt, and LOG_DEBUG_CONVERT.

184 {
185  const float *src = (const float *) cvt->buf;
186  Uint8 *dst = (Uint8 *) cvt->buf;
187  int i;
188 
189  LOG_DEBUG_CONVERT("AUDIO_F32", "AUDIO_U8");
190 
191  for (i = cvt->len_cvt / sizeof (float); i; --i, ++src, ++dst) {
192  *dst = (Uint8) ((*src + 1.0f) * 127.0f);
193  }
194 
195  cvt->len_cvt /= 4;
196  if (cvt->filters[++cvt->filter_index]) {
197  cvt->filters[cvt->filter_index](cvt, AUDIO_U8);
198  }
199 }
#define LOG_DEBUG_CONVERT(from, to)
Definition: SDL_audio_c.h:34
GLenum GLenum dst
Uint8 * buf
Definition: SDL_audio.h:222
int filter_index
Definition: SDL_audio.h:228
GLfloat f
GLenum src
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
#define AUDIO_U8
Definition: SDL_audio.h:89
SDL_AudioFilter filters[SDL_AUDIOCVT_MAX_FILTERS+1]
Definition: SDL_audio.h:227
uint8_t Uint8
Definition: SDL_stdinc.h:157
static void SDL_Convert_S16_to_F32_Scalar ( SDL_AudioCVT cvt,
SDL_AudioFormat  format 
)
static

Definition at line 108 of file SDL_audiotypecvt.c.

References AUDIO_F32SYS, SDL_AudioCVT::buf, DIVBY32768, SDL_AudioCVT::filter_index, SDL_AudioCVT::filters, i, SDL_AudioCVT::len_cvt, and LOG_DEBUG_CONVERT.

109 {
110  const Sint16 *src = ((const Sint16 *) (cvt->buf + cvt->len_cvt)) - 1;
111  float *dst = ((float *) (cvt->buf + cvt->len_cvt * 2)) - 1;
112  int i;
113 
114  LOG_DEBUG_CONVERT("AUDIO_S16", "AUDIO_F32");
115 
116  for (i = cvt->len_cvt / sizeof (Sint16); i; --i, --src, --dst) {
117  *dst = ((float) *src) * DIVBY32768;
118  }
119 
120  cvt->len_cvt *= 2;
121  if (cvt->filters[++cvt->filter_index]) {
122  cvt->filters[cvt->filter_index](cvt, AUDIO_F32SYS);
123  }
124 }
#define LOG_DEBUG_CONVERT(from, to)
Definition: SDL_audio_c.h:34
GLenum GLenum dst
Uint8 * buf
Definition: SDL_audio.h:222
int filter_index
Definition: SDL_audio.h:228
GLenum src
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
SDL_AudioFilter filters[SDL_AUDIOCVT_MAX_FILTERS+1]
Definition: SDL_audio.h:227
#define AUDIO_F32SYS
Definition: SDL_audio.h:125
#define DIVBY32768
int16_t Sint16
Definition: SDL_stdinc.h:163
static void SDL_Convert_S32_to_F32_Scalar ( SDL_AudioCVT cvt,
SDL_AudioFormat  format 
)
static

Definition at line 146 of file SDL_audiotypecvt.c.

References AUDIO_F32SYS, SDL_AudioCVT::buf, DIVBY2147483648, SDL_AudioCVT::filter_index, SDL_AudioCVT::filters, i, SDL_AudioCVT::len_cvt, and LOG_DEBUG_CONVERT.

147 {
148  const Sint32 *src = (const Sint32 *) cvt->buf;
149  float *dst = (float *) cvt->buf;
150  int i;
151 
152  LOG_DEBUG_CONVERT("AUDIO_S32", "AUDIO_F32");
153 
154  for (i = cvt->len_cvt / sizeof (Sint32); i; --i, ++src, ++dst) {
155  *dst = (float) (((double) *src) * DIVBY2147483648);
156  }
157 
158  if (cvt->filters[++cvt->filter_index]) {
159  cvt->filters[cvt->filter_index](cvt, AUDIO_F32SYS);
160  }
161 }
#define LOG_DEBUG_CONVERT(from, to)
Definition: SDL_audio_c.h:34
GLenum GLenum dst
Uint8 * buf
Definition: SDL_audio.h:222
int filter_index
Definition: SDL_audio.h:228
GLenum src
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
SDL_AudioFilter filters[SDL_AUDIOCVT_MAX_FILTERS+1]
Definition: SDL_audio.h:227
#define AUDIO_F32SYS
Definition: SDL_audio.h:125
int32_t Sint32
Definition: SDL_stdinc.h:175
#define DIVBY2147483648
static void SDL_Convert_S8_to_F32_Scalar ( SDL_AudioCVT cvt,
SDL_AudioFormat  format 
)
static

Definition at line 70 of file SDL_audiotypecvt.c.

References AUDIO_F32SYS, SDL_AudioCVT::buf, DIVBY128, SDL_AudioCVT::filter_index, SDL_AudioCVT::filters, i, SDL_AudioCVT::len_cvt, and LOG_DEBUG_CONVERT.

71 {
72  const Sint8 *src = ((const Sint8 *) (cvt->buf + cvt->len_cvt)) - 1;
73  float *dst = ((float *) (cvt->buf + cvt->len_cvt * 4)) - 1;
74  int i;
75 
76  LOG_DEBUG_CONVERT("AUDIO_S8", "AUDIO_F32");
77 
78  for (i = cvt->len_cvt; i; --i, --src, --dst) {
79  *dst = ((float) *src) * DIVBY128;
80  }
81 
82  cvt->len_cvt *= 4;
83  if (cvt->filters[++cvt->filter_index]) {
84  cvt->filters[cvt->filter_index](cvt, AUDIO_F32SYS);
85  }
86 }
#define LOG_DEBUG_CONVERT(from, to)
Definition: SDL_audio_c.h:34
GLenum GLenum dst
Uint8 * buf
Definition: SDL_audio.h:222
int filter_index
Definition: SDL_audio.h:228
GLenum src
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
SDL_AudioFilter filters[SDL_AUDIOCVT_MAX_FILTERS+1]
Definition: SDL_audio.h:227
#define AUDIO_F32SYS
Definition: SDL_audio.h:125
int8_t Sint8
Definition: SDL_stdinc.h:151
#define DIVBY128
static void SDL_Convert_U16_to_F32_Scalar ( SDL_AudioCVT cvt,
SDL_AudioFormat  format 
)
static

Definition at line 127 of file SDL_audiotypecvt.c.

References AUDIO_F32SYS, SDL_AudioCVT::buf, DIVBY32768, SDL_AudioCVT::filter_index, SDL_AudioCVT::filters, i, SDL_AudioCVT::len_cvt, and LOG_DEBUG_CONVERT.

128 {
129  const Uint16 *src = ((const Uint16 *) (cvt->buf + cvt->len_cvt)) - 1;
130  float *dst = ((float *) (cvt->buf + cvt->len_cvt * 2)) - 1;
131  int i;
132 
133  LOG_DEBUG_CONVERT("AUDIO_U16", "AUDIO_F32");
134 
135  for (i = cvt->len_cvt / sizeof (Uint16); i; --i, --src, --dst) {
136  *dst = (((float) *src) * DIVBY32768) - 1.0f;
137  }
138 
139  cvt->len_cvt *= 2;
140  if (cvt->filters[++cvt->filter_index]) {
141  cvt->filters[cvt->filter_index](cvt, AUDIO_F32SYS);
142  }
143 }
#define LOG_DEBUG_CONVERT(from, to)
Definition: SDL_audio_c.h:34
GLenum GLenum dst
Uint8 * buf
Definition: SDL_audio.h:222
int filter_index
Definition: SDL_audio.h:228
GLfloat f
GLenum src
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
SDL_AudioFilter filters[SDL_AUDIOCVT_MAX_FILTERS+1]
Definition: SDL_audio.h:227
#define AUDIO_F32SYS
Definition: SDL_audio.h:125
uint16_t Uint16
Definition: SDL_stdinc.h:169
#define DIVBY32768
static void SDL_Convert_U8_to_F32_Scalar ( SDL_AudioCVT cvt,
SDL_AudioFormat  format 
)
static

Definition at line 89 of file SDL_audiotypecvt.c.

References AUDIO_F32SYS, SDL_AudioCVT::buf, DIVBY128, SDL_AudioCVT::filter_index, SDL_AudioCVT::filters, i, SDL_AudioCVT::len_cvt, and LOG_DEBUG_CONVERT.

90 {
91  const Uint8 *src = ((const Uint8 *) (cvt->buf + cvt->len_cvt)) - 1;
92  float *dst = ((float *) (cvt->buf + cvt->len_cvt * 4)) - 1;
93  int i;
94 
95  LOG_DEBUG_CONVERT("AUDIO_U8", "AUDIO_F32");
96 
97  for (i = cvt->len_cvt; i; --i, --src, --dst) {
98  *dst = (((float) *src) * DIVBY128) - 1.0f;
99  }
100 
101  cvt->len_cvt *= 4;
102  if (cvt->filters[++cvt->filter_index]) {
103  cvt->filters[cvt->filter_index](cvt, AUDIO_F32SYS);
104  }
105 }
#define LOG_DEBUG_CONVERT(from, to)
Definition: SDL_audio_c.h:34
GLenum GLenum dst
Uint8 * buf
Definition: SDL_audio.h:222
int filter_index
Definition: SDL_audio.h:228
GLfloat f
GLenum src
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
SDL_AudioFilter filters[SDL_AUDIOCVT_MAX_FILTERS+1]
Definition: SDL_audio.h:227
#define AUDIO_F32SYS
Definition: SDL_audio.h:125
uint8_t Uint8
Definition: SDL_stdinc.h:157
#define DIVBY128

Variable Documentation

SDL_AudioFilter SDL_Convert_F32_to_S16 = NULL

Definition at line 58 of file SDL_audiotypecvt.c.

Referenced by SDL_BuildAudioTypeCVTFromFloat().

SDL_AudioFilter SDL_Convert_F32_to_S32 = NULL

Definition at line 60 of file SDL_audiotypecvt.c.

Referenced by SDL_BuildAudioTypeCVTFromFloat().

SDL_AudioFilter SDL_Convert_F32_to_S8 = NULL

Definition at line 56 of file SDL_audiotypecvt.c.

Referenced by SDL_BuildAudioTypeCVTFromFloat().

SDL_AudioFilter SDL_Convert_F32_to_U16 = NULL

Definition at line 59 of file SDL_audiotypecvt.c.

Referenced by SDL_BuildAudioTypeCVTFromFloat().

SDL_AudioFilter SDL_Convert_F32_to_U8 = NULL

Definition at line 57 of file SDL_audiotypecvt.c.

Referenced by SDL_BuildAudioTypeCVTFromFloat().

SDL_AudioFilter SDL_Convert_S16_to_F32 = NULL

Definition at line 53 of file SDL_audiotypecvt.c.

Referenced by SDL_BuildAudioTypeCVTToFloat().

SDL_AudioFilter SDL_Convert_S32_to_F32 = NULL

Definition at line 55 of file SDL_audiotypecvt.c.

Referenced by SDL_BuildAudioTypeCVTToFloat().

SDL_AudioFilter SDL_Convert_S8_to_F32 = NULL

Definition at line 51 of file SDL_audiotypecvt.c.

Referenced by SDL_BuildAudioTypeCVTToFloat().

SDL_AudioFilter SDL_Convert_U16_to_F32 = NULL

Definition at line 54 of file SDL_audiotypecvt.c.

Referenced by SDL_BuildAudioTypeCVTToFloat().

SDL_AudioFilter SDL_Convert_U8_to_F32 = NULL

Definition at line 52 of file SDL_audiotypecvt.c.

Referenced by SDL_BuildAudioTypeCVTToFloat().