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SDRIQ file format support.

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This commit is contained in:
Jean-François DEL NERO 2026-05-23 09:51:30 +02:00
parent ef6ca82158
commit 7c947e3743
2 changed files with 44 additions and 2 deletions
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33
src/common/wave.c
View File

@ -36,6 +36,8 @@
#include <stdint.h>
#include "std_crc32.h"
#include "wave.h"
#include "utils.h"
@ -43,6 +45,7 @@
wave_io * create_wave(char * path,int samplerate, int type)
{
wav_hdr wavhdr;
sdrid_hdr sdridhdr;
wave_io * w_io;
int sample_byte_size;
@ -62,6 +65,17 @@ wave_io * create_wave(char * path,int samplerate, int type)
w_io->type = type;
switch(w_io->type)
{
case WAVE_FILE_FORMAT_SDRIQ_8BITS_IQ:
memset(&sdridhdr,0,sizeof(sdrid_hdr));
sdridhdr.sample_rate = samplerate;
sdridhdr.center_frequency = 466000000;
sdridhdr.sample_size = 16;
sdridhdr.crc32 = std_crc32(0, (void*)&sdridhdr, sizeof(sdrid_hdr) - sizeof(uint32_t));
fwrite((void*)&sdridhdr,sizeof(sdrid_hdr),1,w_io->file);
w_io->sample_byte_size = 2; // I + Q
break;
case WAVE_FILE_FORMAT_RAW_8BITS_IQ: // Raw / IQ
w_io->sample_byte_size = 2; // I + Q
break;
@ -118,8 +132,22 @@ void write_wave(wave_io * w_io, void * buffer, int nbsamples)
{
if(!w_io->file)
return;
fwrite(buffer,nbsamples * w_io->sample_byte_size,1, w_io->file);
if( w_io->type == WAVE_FILE_FORMAT_SDRIQ_8BITS_IQ )
{
int8_t * src_smp;
int16_t tmpw;
src_smp = ((int8_t *)buffer);
for(int i=0;i<(nbsamples*2);i++)
{
tmpw = ((int16_t)((*src_smp++)));
fwrite(&tmpw,2,1, w_io->file);
}
}
else
{
fwrite(buffer,nbsamples * w_io->sample_byte_size,1, w_io->file);
}
w_io->total_nb_samples += nbsamples;
}
}
@ -135,6 +163,7 @@ void close_wave(wave_io * w_io)
switch(w_io->type)
{
case WAVE_FILE_FORMAT_SDRIQ_8BITS_IQ:
case WAVE_FILE_FORMAT_RAW_8BITS_IQ: // Raw / IQ
fclose(w_io->file);
break;

13
src/common/wave.h
View File

@ -48,6 +48,18 @@ typedef struct wav_hdr_ //
#pragma pack()
#pragma pack(1)
typedef struct sdrid_hdr_
{
uint32_t sample_rate; // S/s
uint64_t center_frequency; // Hz
uint64_t start_unix_epoch; // ms
uint32_t sample_size; // 16 or 24 bits
uint32_t rfu; // 0
uint32_t crc32; //
}sdrid_hdr;
#pragma pack()
typedef struct wave_io_
{
FILE * file;
@ -60,6 +72,7 @@ typedef struct wave_io_
#define WAVE_FILE_FORMAT_WAV_8BITS_STEREO 1
#define WAVE_FILE_FORMAT_WAV_16BITS_STEREO 2
#define WAVE_FILE_FORMAT_WAV_16BITS_MONO 3
#define WAVE_FILE_FORMAT_SDRIQ_8BITS_IQ 5
wave_io * create_wave(char * path,int samplerate,int type);
void write_wave(wave_io * w_io, void * buffer, int nbsamples);