rpitx/csdr
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converters for signed chars, compatible with hackrf_transfer

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Michael Ossmann 2015-11-22 12:53:10 -07:00
parent 6ee80ea7ce
commit a3ad1e62d9
4 changed files with 39 additions and 0 deletions
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2
README.md
View file

@ -122,6 +122,8 @@ The following commands are available:
- `csdr convert_u8_f`
- `csdr convert_f_u8`
- `csdr convert_s8_f`
- `csdr convert_f_s8`
- `csdr convert_i16_f`
- `csdr convert_f_i16`

25
csdr.c
View file

@ -55,6 +55,8 @@ char usage[]=
"list of functions:\n\n"
" convert_u8_f\n"
" convert_f_u8\n"
" convert_s8_f\n"
" convert_f_s8\n"
" convert_f_i16\n"
" convert_i16_f\n"
" realpart_cf\n"
@ -204,6 +206,7 @@ int main(int argc, char *argv[])
{
static float input_buffer[BIG_BUFSIZE*2];
static unsigned char buffer_u8[BIG_BUFSIZE*2];
static signed char buffer_s8[BIG_BUFSIZE*2];
static float output_buffer[BIG_BUFSIZE*2];
static short buffer_i16[BIG_BUFSIZE*2];
static float temp_f[BIG_BUFSIZE*4];
@ -231,6 +234,28 @@ int main(int argc, char *argv[])
TRY_YIELD;
}
}
if(!strcmp(argv[1],"convert_s8_f"))
{
for(;;)
{
FEOF_CHECK;
fread(buffer_s8, sizeof(signed char), BUFSIZE, stdin);
convert_s8_f(buffer_s8, output_buffer, BUFSIZE);
FWRITE_R;
TRY_YIELD;
}
}
if(!strcmp(argv[1],"convert_f_s8")) //not tested
{
for(;;)
{
FEOF_CHECK;
FREAD_R;
convert_f_s8(input_buffer, buffer_s8, BUFSIZE);
fwrite(buffer_s8, sizeof(signed char), BUFSIZE, stdout);
TRY_YIELD;
}
}
if(!strcmp(argv[1],"convert_f_i16"))
{
for(;;)

10
libcsdr.c
View file

@ -805,6 +805,11 @@ void convert_u8_f(unsigned char* input, float* output, int input_size)
for(int i=0;i<input_size;i++) output[i]=((float)input[i])/(UCHAR_MAX/2.0)-1.0; //@convert_u8_f
}
void convert_s8_f(signed char* input, float* output, int input_size)
{
for(int i=0;i<input_size;i++) output[i]=((float)input[i])/SCHAR_MAX; //@convert_s8_f
}
void convert_i16_f(short* input, float* output, int input_size)
{
for(int i=0;i<input_size;i++) output[i]=(float)input[i]/SHRT_MAX; //@convert_i16_f
@ -817,6 +822,11 @@ void convert_f_u8(float* input, unsigned char* output, int input_size)
//of at least -60 dB is shown on the FFT plot after convert_f_u8 -> convert_u8_f
}
void convert_f_s8(float* input, signed char* output, int input_size)
{
for(int i=0;i<input_size;i++) output[i]=input[i]*SCHAR_MAX; //@convert_f_s8
}
void convert_f_i16(float* input, short* output, int input_size)
{
/*for(int i=0;i<input_size;i++)

2
libcsdr.h
View file

@ -164,6 +164,8 @@ void gain_ff(float* input, float* output, int input_size, float gain);
void convert_u8_f(unsigned char* input, float* output, int input_size);
void convert_f_u8(float* input, unsigned char* output, int input_size);
void convert_s8_f(signed char* input, float* output, int input_size);
void convert_f_s8(float* input, signed char* output, int input_size);
void convert_f_i16(float* input, short* output, int input_size);
void convert_i16_f(short* input, float* output, int input_size);