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mpv/libaf/af_format.c

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/* This audio output filter changes the format of a data block. Valid
formats are: AFMT_U8, AFMT_S8, AFMT_S16_LE, AFMT_S16_BE
AFMT_U16_LE, AFMT_U16_BE, AFMT_S32_LE and AFMT_S32_BE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <inttypes.h>
#include <limits.h>
#include "af.h"
#include "../bswap.h"
#include "../libvo/fastmemcpy.h"
// Integer to float conversion through lrintf()
#ifdef HAVE_LRINTF
#define __USE_ISOC99 1
#include <math.h>
#else
#define lrintf(x) ((int)(x))
#endif
/* Functions used by play to convert the input audio to the correct
format */
/* The below includes retrives functions for converting to and from
ulaw and alaw */
#include "af_format_ulaw.c"
#include "af_format_alaw.c"
// Switch endianess
static void endian(void* in, void* out, int len, int bps);
// From singed to unsigned
static void si2us(void* in, void* out, int len, int bps);
// From unsinged to signed
static void us2si(void* in, void* out, int len, int bps);
// Change the number of bits per sample
static void change_bps(void* in, void* out, int len, int inbps, int outbps);
// From float to int signed
static void float2int(void* in, void* out, int len, int bps);
// From signed int to float
static void int2float(void* in, void* out, int len, int bps);
static af_data_t* play(struct af_instance_s* af, af_data_t* data);
static af_data_t* play_swapendian(struct af_instance_s* af, af_data_t* data);
static af_data_t* play_float_s16(struct af_instance_s* af, af_data_t* data);
static af_data_t* play_s16_float(struct af_instance_s* af, af_data_t* data);
// Convert from string to format
int af_str2fmt(char* str)
{
int format=0;
// Scan for endianess
if(strstr(str,"be") || strstr(str,"BE"))
format |= AF_FORMAT_BE;
else if(strstr(str,"le") || strstr(str,"LE"))
format |= AF_FORMAT_LE;
else
format |= AF_FORMAT_NE;
// Scan for special formats
if(strstr(str,"mulaw") || strstr(str,"MULAW")){
format |= AF_FORMAT_MU_LAW; return format;
}
if(strstr(str,"alaw") || strstr(str,"ALAW")){
format |= AF_FORMAT_A_LAW; return format;
}
if(strstr(str,"ac3") || strstr(str,"AC3")){
format |= AF_FORMAT_AC3; return format;
}
if(strstr(str,"mpeg2") || strstr(str,"MPEG2")){
format |= AF_FORMAT_MPEG2; return format;
}
if(strstr(str,"imaadpcm") || strstr(str,"IMAADPCM")){
format |= AF_FORMAT_IMA_ADPCM; return format;
}
// Scan for int/float
if(strstr(str,"float") || strstr(str,"FLOAT")){
format |= AF_FORMAT_F; return format;
}
else
format |= AF_FORMAT_I;
// Scan for signed/unsigned
if(strstr(str,"unsigned") || strstr(str,"UNSIGNED"))
format |= AF_FORMAT_US;
else
format |= AF_FORMAT_SI;
return format;
}
inline int af_fmt2bits(int format)
{
return (format & AF_FORMAT_BITS_MASK)+8;
// return (((format & AF_FORMAT_BITS_MASK)>>3)+1) * 8;
#if 0
switch(format & AF_FORMAT_BITS_MASK)
{
case AF_FORMAT_8BIT: return 8;
case AF_FORMAT_16BIT: return 16;
case AF_FORMAT_24BIT: return 24;
case AF_FORMAT_32BIT: return 32;
case AF_FORMAT_48BIT: return 48;
}
#endif
return -1;
}
inline int af_bits2fmt(int bits)
{
return (bits/8 - 1) << 3;
}
/* Convert format to str input str is a buffer for the
converted string, size is the size of the buffer */
char* af_fmt2str(int format, char* str, int size)
{
int i=0;
if (size < 1)
return NULL;
size--; // reserve one for terminating 0
// Endianess
if(AF_FORMAT_LE == (format & AF_FORMAT_END_MASK))
i+=snprintf(str,size-i,"little-endian ");
else
i+=snprintf(str,size-i,"big-endian ");
if(format & AF_FORMAT_SPECIAL_MASK){
switch(format & AF_FORMAT_SPECIAL_MASK){
case(AF_FORMAT_MU_LAW):
i+=snprintf(&str[i],size-i,"mu-law "); break;
case(AF_FORMAT_A_LAW):
i+=snprintf(&str[i],size-i,"A-law "); break;
case(AF_FORMAT_MPEG2):
i+=snprintf(&str[i],size-i,"MPEG-2 "); break;
case(AF_FORMAT_AC3):
i+=snprintf(&str[i],size-i,"AC3 "); break;
case(AF_FORMAT_IMA_ADPCM):
i+=snprintf(&str[i],size-i,"IMA-ADPCM "); break;
default:
printf("Unknown special\n");
}
}
else{
// Bits
i+=snprintf(&str[i],size-i,"%d-bit ", af_fmt2bits(format));
// Point
if(AF_FORMAT_F == (format & AF_FORMAT_POINT_MASK))
i+=snprintf(&str[i],size-i,"float ");
else{
// Sign
if(AF_FORMAT_US == (format & AF_FORMAT_SIGN_MASK))
i+=snprintf(&str[i],size-i,"unsigned ");
else
i+=snprintf(&str[i],size-i,"signed ");
i+=snprintf(&str[i],size-i,"int ");
}
}
// remove trailing space
if (i > 0 && str[i - 1] == ' ')
i--;
str[i] = 0; // make sure it is 0 terminated.
return str;
}
char *af_fmt2str_short(int format)
{
switch(format)
{
// special
case AF_FORMAT_MU_LAW: return "mulaw";
case AF_FORMAT_A_LAW: return "alaw";
case AF_FORMAT_MPEG2: return "mpeg2";
case AF_FORMAT_AC3: return "ac3";
case AF_FORMAT_IMA_ADPCM: return "imaadpcm";
// ordinary
case AF_FORMAT_U8: return "u8";
case AF_FORMAT_S8: return "s8";
case AF_FORMAT_U16_LE: return "u16le";
case AF_FORMAT_U16_BE: return "u16be";
case AF_FORMAT_S16_LE: return "s16le";
case AF_FORMAT_S16_BE: return "s16be";
case AF_FORMAT_U24_LE: return "u24le";
case AF_FORMAT_U24_BE: return "u24be";
case AF_FORMAT_S24_LE: return "s24le";
case AF_FORMAT_S24_BE: return "s24be";
case AF_FORMAT_U32_LE: return "u32le";
case AF_FORMAT_U32_BE: return "u32be";
case AF_FORMAT_S32_LE: return "s32le";
case AF_FORMAT_S32_BE: return "s32be";
case AF_FORMAT_FLOAT_LE: return "floatle";
case AF_FORMAT_FLOAT_BE: return "floatbe";
}
return "??";
}
int af_str2fmt_short(char* str)
{
int i;
static struct {
const char *name;
const int format;
} table[] = {
{ "mulaw", AF_FORMAT_MU_LAW },
{ "alaw", AF_FORMAT_A_LAW },
{ "mpeg2", AF_FORMAT_MPEG2 },
{ "ac3", AF_FORMAT_AC3 },
{ "imaadpcm", AF_FORMAT_IMA_ADPCM },
{ "u8", AF_FORMAT_U8 },
{ "s8", AF_FORMAT_S8 },
{ "u16le", AF_FORMAT_U16_LE },
{ "u16be", AF_FORMAT_U16_BE },
{ "u16ne", AF_FORMAT_U16_NE },
{ "s16le", AF_FORMAT_S16_LE },
{ "s16be", AF_FORMAT_S16_BE },
{ "s16ne", AF_FORMAT_S16_NE },
{ "u24le", AF_FORMAT_U24_LE },
{ "u24be", AF_FORMAT_U24_BE },
{ "u24ne", AF_FORMAT_U24_NE },
{ "s24le", AF_FORMAT_S24_LE },
{ "s24be", AF_FORMAT_S24_BE },
{ "s24ne", AF_FORMAT_S24_NE },
{ "u32le", AF_FORMAT_U32_LE },
{ "u32be", AF_FORMAT_U32_BE },
{ "u32ne", AF_FORMAT_U32_NE },
{ "s32le", AF_FORMAT_S32_LE },
{ "s32be", AF_FORMAT_S32_BE },
{ "s32ne", AF_FORMAT_S32_NE },
{ "floatle", AF_FORMAT_FLOAT_LE },
{ "floatbe", AF_FORMAT_FLOAT_BE },
{ "floatne", AF_FORMAT_FLOAT_NE },
{ NULL, 0 }
};
for (i = 0; table[i].name; i++)
if (!strcasecmp(str, table[i].name))
return table[i].format;
return -1;
}
// Helper functions to check sanity for input arguments
// Sanity check for bytes per sample
static int check_bps(int bps)
{
if(bps != 4 && bps != 3 && bps != 2 && bps != 1){
af_msg(AF_MSG_ERROR,"[format] The number of bytes per sample"
" must be 1, 2, 3 or 4. Current value is %i \n",bps);
return AF_ERROR;
}
return AF_OK;
}
// Check for unsupported formats
static int check_format(int format)
{
char buf[256];
switch(format & AF_FORMAT_SPECIAL_MASK){
case(AF_FORMAT_IMA_ADPCM):
case(AF_FORMAT_MPEG2):
case(AF_FORMAT_AC3):
af_msg(AF_MSG_ERROR,"[format] Sample format %s not yet supported \n",
af_fmt2str(format,buf,256));
return AF_ERROR;
}
return AF_OK;
}
// Initialization and runtime control
static int control(struct af_instance_s* af, int cmd, void* arg)
{
switch(cmd){
case AF_CONTROL_REINIT:{
char buf1[256];
char buf2[256];
af_data_t *data = arg;
// Make sure this filter isn't redundant
if(af->data->format == ((af_data_t*)arg)->format &&
af->data->bps == ((af_data_t*)arg)->bps)
return AF_DETACH;
// Check for errors in configuraton
if((AF_OK != check_bps(((af_data_t*)arg)->bps)) ||
(AF_OK != check_format(((af_data_t*)arg)->format)) ||
(AF_OK != check_bps(af->data->bps)) ||
(AF_OK != check_format(af->data->format)))
return AF_ERROR;
af_msg(AF_MSG_VERBOSE,"[format] Changing sample format from %s to %s\n",
af_fmt2str(((af_data_t*)arg)->format,buf1,256),
af_fmt2str(af->data->format,buf2,256));
af->data->rate = ((af_data_t*)arg)->rate;
af->data->nch = ((af_data_t*)arg)->nch;
af->mul.n = af->data->bps;
af->mul.d = ((af_data_t*)arg)->bps;
af_frac_cancel(&af->mul);
af->play = play; // set default
// look whether only endianess differences are there
if ((af->data->format & ~AF_FORMAT_END_MASK) ==
(data->format & ~AF_FORMAT_END_MASK))
{
af_msg(AF_MSG_VERBOSE,"[format] Accelerated endianess conversion only\n");
af->play = play_swapendian;
}
if ((data->format == AF_FORMAT_FLOAT_NE) &&
(af->data->format == AF_FORMAT_S16_NE))
{
af_msg(AF_MSG_VERBOSE,"[format] Accelerated %s to %s conversion\n",
af_fmt2str(((af_data_t*)arg)->format,buf1,256),
af_fmt2str(af->data->format,buf2,256));
af->play = play_float_s16;
}
if ((data->format == AF_FORMAT_S16_NE) &&
(af->data->format == AF_FORMAT_FLOAT_NE))
{
af_msg(AF_MSG_VERBOSE,"[format] Accelerated %s to %s conversion\n",
af_fmt2str(((af_data_t*)arg)->format,buf1,256),
af_fmt2str(af->data->format,buf2,256));
af->play = play_s16_float;
}
return AF_OK;
}
case AF_CONTROL_COMMAND_LINE:{
int format = af_str2fmt_short(arg);
if(AF_OK != af->control(af,AF_CONTROL_FORMAT_FMT | AF_CONTROL_SET,&format))
return AF_ERROR;
return AF_OK;
}
case AF_CONTROL_FORMAT_FMT | AF_CONTROL_SET:{
// Check for errors in configuraton
if(AF_OK != check_format(*(int*)arg))
return AF_ERROR;
af->data->format = *(int*)arg;
af->data->bps = af_fmt2bits(af->data->format)/8;
return AF_OK;
}
}
return AF_UNKNOWN;
}
// Deallocate memory
static void uninit(struct af_instance_s* af)
{
if(af->data)
free(af->data);
af->setup = 0;
}
static af_data_t* play_swapendian(struct af_instance_s* af, af_data_t* data)
{
af_data_t* l = af->data; // Local data
af_data_t* c = data; // Current working data
int len = c->len/c->bps; // Lenght in samples of current audio block
if(AF_OK != RESIZE_LOCAL_BUFFER(af,data))
return NULL;
endian(c->audio,l->audio,len,c->bps);
c->audio = l->audio;
c->format = l->format;
return c;
}
static af_data_t* play_float_s16(struct af_instance_s* af, af_data_t* data)
{
af_data_t* l = af->data; // Local data
af_data_t* c = data; // Current working data
int len = c->len/4; // Lenght in samples of current audio block
if(AF_OK != RESIZE_LOCAL_BUFFER(af,data))
return NULL;
float2int(c->audio, l->audio, len, 2);
c->audio = l->audio;
c->len = len*2;
c->bps = 2;
c->format = l->format;
return c;
}
static af_data_t* play_s16_float(struct af_instance_s* af, af_data_t* data)
{
af_data_t* l = af->data; // Local data
af_data_t* c = data; // Current working data
int len = c->len/2; // Lenght in samples of current audio block
if(AF_OK != RESIZE_LOCAL_BUFFER(af,data))
return NULL;
int2float(c->audio, l->audio, len, 2);
c->audio = l->audio;
c->len = len*4;
c->bps = 4;
c->format = l->format;
return c;
}
// Filter data through filter
static af_data_t* play(struct af_instance_s* af, af_data_t* data)
{
af_data_t* l = af->data; // Local data
af_data_t* c = data; // Current working data
int len = c->len/c->bps; // Lenght in samples of current audio block
if(AF_OK != RESIZE_LOCAL_BUFFER(af,data))
return NULL;
// Change to cpu native endian format
if((c->format&AF_FORMAT_END_MASK)!=AF_FORMAT_NE)
endian(c->audio,c->audio,len,c->bps);
// Conversion table
if((c->format & AF_FORMAT_SPECIAL_MASK) == AF_FORMAT_MU_LAW) {
from_ulaw(c->audio, l->audio, len, l->bps, l->format&AF_FORMAT_POINT_MASK);
if(AF_FORMAT_A_LAW == (l->format&AF_FORMAT_SPECIAL_MASK))
to_ulaw(l->audio, l->audio, len, 1, AF_FORMAT_SI);
if((l->format&AF_FORMAT_SIGN_MASK) == AF_FORMAT_US)
si2us(l->audio,l->audio,len,l->bps);
} else if((c->format & AF_FORMAT_SPECIAL_MASK) == AF_FORMAT_A_LAW) {
from_alaw(c->audio, l->audio, len, l->bps, l->format&AF_FORMAT_POINT_MASK);
if(AF_FORMAT_A_LAW == (l->format&AF_FORMAT_SPECIAL_MASK))
to_alaw(l->audio, l->audio, len, 1, AF_FORMAT_SI);
if((l->format&AF_FORMAT_SIGN_MASK) == AF_FORMAT_US)
si2us(l->audio,l->audio,len,l->bps);
} else if((c->format & AF_FORMAT_POINT_MASK) == AF_FORMAT_F) {
switch(l->format&AF_FORMAT_SPECIAL_MASK){
case(AF_FORMAT_MU_LAW):
to_ulaw(c->audio, l->audio, len, c->bps, c->format&AF_FORMAT_POINT_MASK);
break;
case(AF_FORMAT_A_LAW):
to_alaw(c->audio, l->audio, len, c->bps, c->format&AF_FORMAT_POINT_MASK);
break;
default:
float2int(c->audio, l->audio, len, l->bps);
if((l->format&AF_FORMAT_SIGN_MASK) == AF_FORMAT_US)
si2us(l->audio,l->audio,len,l->bps);
break;
}
} else {
// Input must be int
// Change signed/unsigned
if((c->format&AF_FORMAT_SIGN_MASK) != (l->format&AF_FORMAT_SIGN_MASK)){
if((c->format&AF_FORMAT_SIGN_MASK) == AF_FORMAT_US)
us2si(c->audio,c->audio,len,c->bps);
else
si2us(c->audio,c->audio,len,c->bps);
}
// Convert to special formats
switch(l->format&(AF_FORMAT_SPECIAL_MASK|AF_FORMAT_POINT_MASK)){
case(AF_FORMAT_MU_LAW):
to_ulaw(c->audio, l->audio, len, c->bps, c->format&AF_FORMAT_POINT_MASK);
break;
case(AF_FORMAT_A_LAW):
to_alaw(c->audio, l->audio, len, c->bps, c->format&AF_FORMAT_POINT_MASK);
break;
case(AF_FORMAT_F):
int2float(c->audio, l->audio, len, c->bps);
break;
default:
// Change the number of bits
if(c->bps != l->bps)
change_bps(c->audio,l->audio,len,c->bps,l->bps);
else
memcpy(l->audio,c->audio,len*c->bps);
break;
}
}
// Switch from cpu native endian to the correct endianess
if((l->format&AF_FORMAT_END_MASK)!=AF_FORMAT_NE)
endian(l->audio,l->audio,len,l->bps);
// Set output data
c->audio = l->audio;
c->len = len*l->bps;
c->bps = l->bps;
c->format = l->format;
return c;
}
// Allocate memory and set function pointers
static int open(af_instance_t* af){
af->control=control;
af->uninit=uninit;
af->play=play;
af->mul.n=1;
af->mul.d=1;
af->data=calloc(1,sizeof(af_data_t));
if(af->data == NULL)
return AF_ERROR;
return AF_OK;
}
// Description of this filter
af_info_t af_info_format = {
"Sample format conversion",
"format",
"Anders",
"",
AF_FLAGS_REENTRANT,
open
};
static inline uint32_t load24bit(void* data, int pos) {
#if WORDS_BIGENDIAN
return (((uint32_t)((uint8_t*)data)[3*pos])<<24) |
(((uint32_t)((uint8_t*)data)[3*pos+1])<<16) |
(((uint32_t)((uint8_t*)data)[3*pos+2])<<8);
#else
return (((uint32_t)((uint8_t*)data)[3*pos])<<8) |
(((uint32_t)((uint8_t*)data)[3*pos+1])<<16) |
(((uint32_t)((uint8_t*)data)[3*pos+2])<<24);
#endif
}
static inline void store24bit(void* data, int pos, uint32_t expanded_value) {
#if WORDS_BIGENDIAN
((uint8_t*)data)[3*pos]=expanded_value>>24;
((uint8_t*)data)[3*pos+1]=expanded_value>>16;
((uint8_t*)data)[3*pos+2]=expanded_value>>8;
#else
((uint8_t*)data)[3*pos]=expanded_value>>8;
((uint8_t*)data)[3*pos+1]=expanded_value>>16;
((uint8_t*)data)[3*pos+2]=expanded_value>>24;
#endif
}
// Function implementations used by play
static void endian(void* in, void* out, int len, int bps)
{
register int i;
switch(bps){
case(2):{
for(i=0;i<len;i++){
((uint16_t*)out)[i]=bswap_16(((uint16_t*)in)[i]);
}
break;
}
case(3):{
register uint8_t s;
for(i=0;i<len;i++){
s=((uint8_t*)in)[3*i];
((uint8_t*)out)[3*i]=((uint8_t*)in)[3*i+2];
if (in != out)
((uint8_t*)out)[3*i+1]=((uint8_t*)in)[3*i+1];
((uint8_t*)out)[3*i+2]=s;
}
break;
}
case(4):{
for(i=0;i<len;i++){
((uint32_t*)out)[i]=bswap_32(((uint32_t*)in)[i]);
}
break;
}
}
}
static void si2us(void* in, void* out, int len, int bps)
{
register int i;
switch(bps){
case(1):
for(i=0;i<len;i++)
((uint8_t*)out)[i]=(uint8_t)(SCHAR_MAX+((int)((int8_t*)in)[i]));
break;
case(2):
for(i=0;i<len;i++)
((uint16_t*)out)[i]=(uint16_t)(SHRT_MAX+((int)((int16_t*)in)[i]));
break;
case(3):
for(i=0;i<len;i++)
store24bit(out, i, (uint32_t)(INT_MAX+(int32_t)load24bit(in, i)));
break;
case(4):
for(i=0;i<len;i++)
((uint32_t*)out)[i]=(uint32_t)(INT_MAX+((int32_t*)in)[i]);
break;
}
}
static void us2si(void* in, void* out, int len, int bps)
{
register int i;
switch(bps){
case(1):
for(i=0;i<len;i++)
((int8_t*)out)[i]=(int8_t)(SCHAR_MIN+((int)((uint8_t*)in)[i]));
break;
case(2):
for(i=0;i<len;i++)
((int16_t*)out)[i]=(int16_t)(SHRT_MIN+((int)((uint16_t*)in)[i]));
break;
case(3):
for(i=0;i<len;i++)
store24bit(out, i, (int32_t)(INT_MIN+(uint32_t)load24bit(in, i)));
break;
case(4):
for(i=0;i<len;i++)
((int32_t*)out)[i]=(int32_t)(INT_MIN+((uint32_t*)in)[i]);
break;
}
}
static void change_bps(void* in, void* out, int len, int inbps, int outbps)
{
register int i;
switch(inbps){
case(1):
switch(outbps){
case(2):
for(i=0;i<len;i++)
((uint16_t*)out)[i]=((uint16_t)((uint8_t*)in)[i])<<8;
break;
case(3):
for(i=0;i<len;i++)
store24bit(out, i, ((uint32_t)((uint8_t*)in)[i])<<24);
break;
case(4):
for(i=0;i<len;i++)
((uint32_t*)out)[i]=((uint32_t)((uint8_t*)in)[i])<<24;
break;
}
break;
case(2):
switch(outbps){
case(1):
for(i=0;i<len;i++)
((uint8_t*)out)[i]=(uint8_t)((((uint16_t*)in)[i])>>8);
break;
case(3):
for(i=0;i<len;i++)
store24bit(out, i, ((uint32_t)((uint16_t*)in)[i])<<16);
break;
case(4):
for(i=0;i<len;i++)
((uint32_t*)out)[i]=((uint32_t)((uint16_t*)in)[i])<<16;
break;
}
break;
case(3):
switch(outbps){
case(1):
for(i=0;i<len;i++)
((uint8_t*)out)[i]=(uint8_t)(load24bit(in, i)>>24);
break;
case(2):
for(i=0;i<len;i++)
((uint16_t*)out)[i]=(uint16_t)(load24bit(in, i)>>16);
break;
case(4):
for(i=0;i<len;i++)
((uint32_t*)out)[i]=(uint32_t)load24bit(in, i);
break;
}
break;
case(4):
switch(outbps){
case(1):
for(i=0;i<len;i++)
((uint8_t*)out)[i]=(uint8_t)((((uint32_t*)in)[i])>>24);
break;
case(2):
for(i=0;i<len;i++)
((uint16_t*)out)[i]=(uint16_t)((((uint32_t*)in)[i])>>16);
break;
case(3):
for(i=0;i<len;i++)
store24bit(out, i, ((uint32_t*)in)[i]);
break;
}
break;
}
}
static void float2int(void* in, void* out, int len, int bps)
{
register int i;
switch(bps){
case(1):
for(i=0;i<len;i++)
((int8_t*)out)[i]=(int8_t)lrintf(SCHAR_MAX*((float*)in)[i]);
break;
case(2):
for(i=0;i<len;i++)
((int16_t*)out)[i]=(int16_t)lrintf(SHRT_MAX*((float*)in)[i]);
break;
case(3):
for(i=0;i<len;i++)
store24bit(out, i, (int32_t)lrintf(INT_MAX*((float*)in)[i]));
break;
case(4):
for(i=0;i<len;i++)
((int32_t*)out)[i]=(int32_t)lrintf(INT_MAX*((float*)in)[i]);
break;
}
}
static void int2float(void* in, void* out, int len, int bps)
{
register int i;
switch(bps){
case(1):
for(i=0;i<len;i++)
((float*)out)[i]=(1.0/SCHAR_MAX)*((float)((int8_t*)in)[i]);
break;
case(2):
for(i=0;i<len;i++)
((float*)out)[i]=(1.0/SHRT_MAX)*((float)((int16_t*)in)[i]);
break;
case(3):
for(i=0;i<len;i++)
((float*)out)[i]=(1.0/INT_MAX)*((float)((int32_t)load24bit(in, i)));
break;
case(4):
for(i=0;i<len;i++)
((float*)out)[i]=(1.0/INT_MAX)*((float)((int32_t*)in)[i]);
break;
}
}
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