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lib: add IQ converter

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This commit is contained in:
Steve Markgraf 2025-03-09 17:36:22 +01:00
parent de7c63b090
commit ae0d94eba6
7 changed files with 712 additions and 4 deletions
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134
include/filters.h Normal file
View file

@ -0,0 +1,134 @@
/*
Copyright (C) 2014, Youssef Touil <youssef@airspy.com>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
#ifndef FILTERS_H
#define FILTERS_H
#include <stdint.h>
#define HB_KERNEL_FLOAT_LEN 47
const float HB_KERNEL_FLOAT[HB_KERNEL_FLOAT_LEN] =
{
-0.000998606272947510,
0.000000000000000000,
0.001695637278417295,
0.000000000000000000,
-0.003054430179754289,
0.000000000000000000,
0.005055504379767936,
0.000000000000000000,
-0.007901319195893647,
0.000000000000000000,
0.011873357051047719,
0.000000000000000000,
-0.017411159379930066,
0.000000000000000000,
0.025304817427568772,
0.000000000000000000,
-0.037225225204559217,
0.000000000000000000,
0.057533286997004301,
0.000000000000000000,
-0.102327462004259350,
0.000000000000000000,
0.317034472508947400,
0.500000000000000000,
0.317034472508947400,
0.000000000000000000,
-0.102327462004259350,
0.000000000000000000,
0.057533286997004301,
0.000000000000000000,
-0.037225225204559217,
0.000000000000000000,
0.025304817427568772,
0.000000000000000000,
-0.017411159379930066,
0.000000000000000000,
0.011873357051047719,
0.000000000000000000,
-0.007901319195893647,
0.000000000000000000,
0.005055504379767936,
0.000000000000000000,
-0.003054430179754289,
0.000000000000000000,
0.001695637278417295,
0.000000000000000000,
-0.000998606272947510
};
#define HB_KERNEL_INT16_LEN 47
const int16_t HB_KERNEL_INT16[HB_KERNEL_INT16_LEN] =
{
-33,
0,
56,
0,
-100,
0,
166,
0,
-259,
0,
389,
0,
-571,
0,
829,
0,
-1220,
0,
1885,
0,
-3353,
0,
10389,
16384,
10389,
0,
-3353,
0,
1885,
0,
-1220,
0,
829,
0,
-571,
0,
389,
0,
-259,
0,
166,
0,
-100,
0,
56,
0,
-33
};
#endif // FILTERS_H

1
include/hsdaoh_private.h
View file

@ -36,6 +36,7 @@ struct hsdaoh_dev {
unsigned int width, height, fps;
bool output_float;
iqconverter_float_t *cnv_f;
/* status */
int dev_lost;

47
include/iqconverter_float.h Normal file
View file

@ -0,0 +1,47 @@
/*
Copyright (C) 2014, Youssef Touil <youssef@airspy.com>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
#ifndef IQCONVERTER_FLOAT_H
#define IQCONVERTER_FLOAT_H
#include <stdint.h>
#define IQCONVERTER_NZEROS 2
#define IQCONVERTER_NPOLES 2
typedef struct {
float avg;
float hbc;
int len;
int fir_index;
int delay_index;
float *fir_kernel;
float *fir_queue;
float *delay_line;
} iqconverter_float_t;
iqconverter_float_t *iqconverter_float_create(const float *hb_kernel, int len);
void iqconverter_float_free(iqconverter_float_t *cnv);
void iqconverter_float_reset(iqconverter_float_t *cnv);
void iqconverter_float_process(iqconverter_float_t *cnv, float *samples, int len);
#endif // IQCONVERTER_FLOAT_H

5
src/CMakeLists.txt
View file

@ -18,7 +18,7 @@
########################################################################
# Setup shared library variant
########################################################################
add_library(hsdaoh SHARED libhsdaoh.c format_convert.c)
add_library(hsdaoh SHARED libhsdaoh.c format_convert.c iqconverter_float.c)
target_link_libraries(hsdaoh ${LIBUSB_LIBRARIES} ${LIBUVC_LIBRARIES} ${THREADS_PTHREADS_LIBRARY})
target_include_directories(hsdaoh PUBLIC
$<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/include>
@ -36,7 +36,7 @@ generate_export_header(hsdaoh)
########################################################################
# Setup static library variant
########################################################################
add_library(hsdaoh_static STATIC libhsdaoh.c format_convert.c)
add_library(hsdaoh_static STATIC libhsdaoh.c format_convert.c iqconverter_float.c)
target_link_libraries(hsdaoh m ${LIBUSB_LIBRARIES} ${LIBUVC_LIBRARIES} ${THREADS_PTHREADS_LIBRARY})
target_include_directories(hsdaoh_static PUBLIC
$<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/include>
@ -46,6 +46,7 @@ target_include_directories(hsdaoh_static PUBLIC
${THREADS_PTHREADS_INCLUDE_DIR}
)
set_property(TARGET hsdaoh_static APPEND PROPERTY COMPILE_DEFINITIONS "hsdaoh_STATIC" )
set_property(TARGET hsdaoh_static PROPERTY POSITION_INDEPENDENT_CODE ON)
if(NOT WIN32)
# Force same library filename for static and shared variants of the library
set_target_properties(hsdaoh_static PROPERTIES OUTPUT_NAME hsdaoh)

3
src/format_convert.c
View file

@ -26,6 +26,7 @@
#include <stdlib.h>
#include <libusb.h>
#include <libuvc/libuvc.h>
#include <iqconverter_float.h>
#include <hsdaoh.h>
#include <hsdaoh_private.h>
#include <format_convert.h>
@ -47,6 +48,8 @@ static inline void hsdaoh_16bit_to_float(hsdaoh_dev_t *dev, hsdaoh_data_info_t *
floats[j++] = (sample_i - scale) * (1/scale);
}
// iqconverter_float_process(dev->cnv_f, (float *) floats, j);
data_info->buf = (uint8_t *)floats;
data_info->len = j * sizeof(float);
dev->cb(data_info);

502
src/iqconverter_float.c Normal file
View file

@ -0,0 +1,502 @@
/*
Copyright (C) 2014, Youssef Touil <youssef@airspy.com>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
#include "iqconverter_float.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#if defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR)
#include <malloc.h>
#define _aligned_malloc __mingw_aligned_malloc
#define _aligned_free __mingw_aligned_free
#define _inline inline
#define FIR_STANDARD
#elif defined(__APPLE__)
#include <malloc/malloc.h>
#define _aligned_malloc(size, alignment) malloc(size)
#define _aligned_free(mem) free(mem)
#define _inline inline
#define FIR_STANDARD
#elif defined(__FreeBSD__)
#define USE_SSE2
#include <immintrin.h>
#define _inline inline
#define _aligned_free(mem) free(mem)
void *_aligned_malloc(size_t size, size_t alignment)
{
void *result;
if (posix_memalign(&result, alignment, size) == 0)
return result;
return 0;
}
#elif defined(__GNUC__) && !defined(__MINGW64_VERSION_MAJOR)
#include <malloc.h>
#define _aligned_malloc(size, alignment) memalign(alignment, size)
#define _aligned_free(mem) free(mem)
#define _inline inline
#else
#if (_MSC_VER >= 1800)
//#define USE_SSE2
//#include <immintrin.h>
#endif
#endif
#define SIZE_FACTOR 32
#define DEFAULT_ALIGNMENT 16
#define HPF_COEFF 0.01f
#if defined(_MSC_VER)
#define ALIGNED __declspec(align(DEFAULT_ALIGNMENT))
#else
#define ALIGNED
#endif
iqconverter_float_t *iqconverter_float_create(const float *hb_kernel, int len)
{
int i, j;
size_t buffer_size;
iqconverter_float_t *cnv = (iqconverter_float_t *) _aligned_malloc(sizeof(iqconverter_float_t), DEFAULT_ALIGNMENT);
cnv->len = len / 2 + 1;
cnv->hbc = hb_kernel[len / 2];
buffer_size = cnv->len * sizeof(float);
cnv->fir_kernel = (float *) _aligned_malloc(buffer_size, DEFAULT_ALIGNMENT);
cnv->fir_queue = (float *) _aligned_malloc(buffer_size * SIZE_FACTOR, DEFAULT_ALIGNMENT);
cnv->delay_line = (float *) _aligned_malloc(buffer_size / 2, DEFAULT_ALIGNMENT);
iqconverter_float_reset(cnv);
for (i = 0, j = 0; i < cnv->len; i++, j += 2)
{
cnv->fir_kernel[i] = hb_kernel[j];
}
return cnv;
}
void iqconverter_float_free(iqconverter_float_t *cnv)
{
_aligned_free(cnv->fir_kernel);
_aligned_free(cnv->fir_queue);
_aligned_free(cnv->delay_line);
_aligned_free(cnv);
}
void iqconverter_float_reset(iqconverter_float_t *cnv)
{
cnv->avg = 0.0f;
cnv->fir_index = 0;
cnv->delay_index = 0;
memset(cnv->delay_line, 0, cnv->len * sizeof(float) / 2);
memset(cnv->fir_queue, 0, cnv->len * sizeof(float) * SIZE_FACTOR);
}
static _inline float process_fir_taps(const float *kernel, const float *queue, int len)
{
int i;
#ifdef USE_SSE2
__m128 acc = _mm_set_ps(0, 0, 0, 0);
#else
float sum = 0.0f;
#endif
if (len >= 8)
{
int it = len >> 3;
#ifdef USE_SSE2
for (i = 0; i < it; i++)
{
__m128 head1 = _mm_loadu_ps(queue);
__m128 kern1 = _mm_load_ps(kernel);
__m128 head2 = _mm_loadu_ps(queue + 4);
__m128 kern2 = _mm_load_ps(kernel + 4);
__m128 mul1 = _mm_mul_ps(kern1, head1);
__m128 mul2 = _mm_mul_ps(kern2, head2);
mul1 = _mm_add_ps(mul1, mul2);
acc = _mm_add_ps(acc, mul1);
queue += 8;
kernel += 8;
}
#else
for (i = 0; i < it; i++)
{
sum += kernel[0] * queue[0]
+ kernel[1] * queue[1]
+ kernel[2] * queue[2]
+ kernel[3] * queue[3]
+ kernel[4] * queue[4]
+ kernel[5] * queue[5]
+ kernel[6] * queue[6]
+ kernel[7] * queue[7];
queue += 8;
kernel += 8;
}
#endif
len &= 7;
}
if (len >= 4)
{
#ifdef USE_SSE2
__m128 head = _mm_loadu_ps(queue);
__m128 kern = _mm_load_ps(kernel);
__m128 mul = _mm_mul_ps(kern, head);
acc = _mm_add_ps(acc, mul);
#else
sum += kernel[0] * queue[0]
+ kernel[1] * queue[1]
+ kernel[2] * queue[2]
+ kernel[3] * queue[3];
#endif
kernel += 4;
queue += 4;
len &= 3;
}
#ifdef USE_SSE2
__m128 t = _mm_add_ps(acc, _mm_movehl_ps(acc, acc));
acc = _mm_add_ss(t, _mm_shuffle_ps(t, t, 1));
#ifdef __FreeBSD__
float sum = acc[0];
#else
float sum = acc.m128_f32[0];
#endif
#endif
if (len >= 2)
{
sum += kernel[0] * queue[0]
+ kernel[1] * queue[1];
//kernel += 2;
//queue += 2;
//len &= 1;
}
//if (len >= 1)
//{
// sum += kernel[0] * queue[0];
//}
return sum;
}
static void fir_interleaved_4(iqconverter_float_t *cnv, float *samples, int len)
{
int i;
int fir_index = cnv->fir_index;
int fir_len = cnv->len;
float *fir_kernel = cnv->fir_kernel;
float *fir_queue = cnv->fir_queue;
float *queue;
float acc;
for (i = 0; i < len; i += 2)
{
queue = fir_queue + fir_index;
queue[0] = samples[i];
acc = fir_kernel[0] * (queue[0] + queue[4 - 1])
+ fir_kernel[1] * (queue[1] + queue[4 - 2]);
samples[i] = acc;
if (--fir_index < 0)
{
fir_index = fir_len * (SIZE_FACTOR - 1);
memcpy(fir_queue + fir_index + 1, fir_queue, (fir_len - 1) * sizeof(float));
}
}
cnv->fir_index = fir_index;
}
static void fir_interleaved_8(iqconverter_float_t *cnv, float *samples, int len)
{
int i;
int fir_index = cnv->fir_index;
int fir_len = cnv->len;
float *fir_kernel = cnv->fir_kernel;
float *fir_queue = cnv->fir_queue;
float *queue;
float acc;
for (i = 0; i < len; i += 2)
{
queue = fir_queue + fir_index;
queue[0] = samples[i];
acc = fir_kernel[0] * (queue[0] + queue[8 - 1])
+ fir_kernel[1] * (queue[1] + queue[8 - 2])
+ fir_kernel[2] * (queue[2] + queue[8 - 3])
+ fir_kernel[3] * (queue[3] + queue[8 - 4]);
samples[i] = acc;
if (--fir_index < 0)
{
fir_index = fir_len * (SIZE_FACTOR - 1);
memcpy(fir_queue + fir_index + 1, fir_queue, (fir_len - 1) * sizeof(float));
}
}
cnv->fir_index = fir_index;
}
static void fir_interleaved_12(iqconverter_float_t *cnv, float *samples, int len)
{
int i;
int fir_index = cnv->fir_index;
int fir_len = cnv->len;
float *fir_kernel = cnv->fir_kernel;
float *fir_queue = cnv->fir_queue;
float *queue;
float acc = 0;
for (i = 0; i < len; i += 2)
{
queue = fir_queue + fir_index;
queue[0] = samples[i];
acc = fir_kernel[0] * (queue[0] + queue[12 - 1])
+ fir_kernel[1] * (queue[1] + queue[12 - 2])
+ fir_kernel[2] * (queue[2] + queue[12 - 3])
+ fir_kernel[3] * (queue[3] + queue[12 - 4])
+ fir_kernel[4] * (queue[4] + queue[12 - 5])
+ fir_kernel[5] * (queue[5] + queue[12 - 6]);
samples[i] = acc;
if (--fir_index < 0)
{
fir_index = fir_len * (SIZE_FACTOR - 1);
memcpy(fir_queue + fir_index + 1, fir_queue, (fir_len - 1) * sizeof(float));
}
}
cnv->fir_index = fir_index;
}
static void fir_interleaved_24(iqconverter_float_t *cnv, float *samples, int len)
{
int i;
int fir_index = cnv->fir_index;
int fir_len = cnv->len;
float *fir_kernel = cnv->fir_kernel;
float *fir_queue = cnv->fir_queue;
float *queue;
float acc = 0;
for (i = 0; i < len; i += 2)
{
queue = fir_queue + fir_index;
queue[0] = samples[i];
acc = fir_kernel[0] * (queue[0] + queue[24 - 1])
+ fir_kernel[1] * (queue[1] + queue[24 - 2])
+ fir_kernel[2] * (queue[2] + queue[24 - 3])
+ fir_kernel[3] * (queue[3] + queue[24 - 4])
+ fir_kernel[4] * (queue[4] + queue[24 - 5])
+ fir_kernel[5] * (queue[5] + queue[24 - 6])
+ fir_kernel[6] * (queue[6] + queue[24 - 7])
+ fir_kernel[7] * (queue[7] + queue[24 - 8])
+ fir_kernel[8] * (queue[8] + queue[24 - 9])
+ fir_kernel[9] * (queue[9] + queue[24 - 10])
+ fir_kernel[10] * (queue[10] + queue[24 - 11])
+ fir_kernel[11] * (queue[11] + queue[24 - 12]);
samples[i] = acc;
if (--fir_index < 0)
{
fir_index = fir_len * (SIZE_FACTOR - 1);
memcpy(fir_queue + fir_index + 1, fir_queue, (fir_len - 1) * sizeof(float));
}
}
cnv->fir_index = fir_index;
}
static void fir_interleaved_generic(iqconverter_float_t *cnv, float *samples, int len)
{
int i;
int fir_index = cnv->fir_index;
int fir_len = cnv->len;
float *fir_kernel = cnv->fir_kernel;
float *fir_queue = cnv->fir_queue;
float *queue;
for (i = 0; i < len; i += 2)
{
queue = fir_queue + fir_index;
queue[0] = samples[i];
samples[i] = process_fir_taps(fir_kernel, queue, fir_len);
if (--fir_index < 0)
{
fir_index = fir_len * (SIZE_FACTOR - 1);
memcpy(fir_queue + fir_index + 1, fir_queue, (fir_len - 1) * sizeof(float));
}
}
cnv->fir_index = fir_index;
}
static void fir_interleaved(iqconverter_float_t *cnv, float *samples, int len)
{
switch (cnv->len)
{
case 4:
fir_interleaved_4(cnv, samples, len);
break;
case 8:
fir_interleaved_8(cnv, samples, len);
break;
case 12:
fir_interleaved_12(cnv, samples, len);
break;
case 24:
fir_interleaved_24(cnv, samples, len);
break;
default:
fir_interleaved_generic(cnv, samples, len);
break;
}
}
static void delay_interleaved(iqconverter_float_t *cnv, float *samples, int len)
{
int i;
ALIGNED int index;
ALIGNED int half_len;
ALIGNED float res;
half_len = cnv->len >> 1;
index = cnv->delay_index;
for (i = 0; i < len; i += 2)
{
res = cnv->delay_line[index];
cnv->delay_line[index] = samples[i];
samples[i] = res;
if (++index >= half_len)
{
index = 0;
}
}
cnv->delay_index = index;
}
#define SCALE (0.01f)
static void remove_dc(iqconverter_float_t *cnv, float *samples, int len)
{
int i;
ALIGNED float avg = cnv->avg;
for (i = 0; i < len; i++)
{
samples[i] -= avg;
avg += SCALE * samples[i];
}
cnv->avg = avg;
}
static void translate_fs_4(iqconverter_float_t *cnv, float *samples, int len)
{
int i;
ALIGNED float hbc = cnv->hbc;
#ifdef USE_SSE2
float *buf = samples;
ALIGNED __m128 vec;
ALIGNED __m128 rot = _mm_set_ps(hbc, 1.0f, -hbc, -1.0f);
for (i = 0; i < len / 4; i++, buf +=4)
{
vec = _mm_loadu_ps(buf);
vec = _mm_mul_ps(vec, rot);
_mm_storeu_ps(buf, vec);
}
#else
int j;
for (i = 0; i < len / 4; i++)
{
j = i << 2;
samples[j + 0] = -samples[j + 0];
samples[j + 1] = -samples[j + 1] * hbc;
//samples[j + 2] = samples[j + 2];
samples[j + 3] = samples[j + 3] * hbc;
}
#endif
fir_interleaved(cnv, samples, len);
delay_interleaved(cnv, samples + 1, len);
}
void iqconverter_float_process(iqconverter_float_t *cnv, float *samples, int len)
{
remove_dc(cnv, samples, len);
translate_fs_4(cnv, samples, len);
}

24
src/libhsdaoh.c
View file

@ -43,6 +43,9 @@
#include <libusb.h>
#include <libuvc/libuvc.h>
#include <iqconverter_float.h>
#include <filters.h>
#include <hsdaoh.h>
#include <hsdaoh_private.h>
#include <format_convert.h>
@ -473,6 +476,7 @@ int hsdaoh_open(hsdaoh_dev_t **out_dev, uint32_t index)
goto err;
dev->dev_lost = 0;
dev->cnv_f = iqconverter_float_create(HB_KERNEL_FLOAT, HB_KERNEL_FLOAT_LEN);
found:
*out_dev = dev;
@ -504,11 +508,23 @@ int hsdaoh_close(hsdaoh_dev_t *dev)
uvc_unref_device(dev->uvc_dev);
uvc_exit(dev->uvc_ctx);
iqconverter_float_free(dev->cnv_f);
free(dev);
return 0;
}
// maybe rename to preferred output format
// and add real output format to data_info_t
int hsdaoh_set_output_format(hsdaoh_dev_t *dev, hsdaoh_output_format_t format)
{
if (!dev)
return -1;
return 0;
}
/* callback for idle/filler data */
inline int hsdaoh_check_idle_cnt(hsdaoh_dev_t *dev, uint16_t *buf, size_t length)
{
@ -629,8 +645,10 @@ void hsdaoh_process_frame(hsdaoh_dev_t *dev, uint8_t *data, int size)
} else if ((meta.crc_config == CRC16_1_LINE) || (meta.crc_config == CRC16_2_LINE)) {
uint16_t expected_crc = (meta.crc_config == CRC16_1_LINE) ? dev->last_crc[0] : dev->last_crc[1];
if ((crc != expected_crc) && dev->stream_synced)
if ((crc != expected_crc) && dev->stream_synced) {
frame_errors++;
fprintf(stderr, "Checksum mismatch in line %d: %04x != %04x\n", i, crc, expected_crc);
}
dev->last_crc[1] = dev->last_crc[0];
dev->last_crc[0] = crc16_ccitt(line_dat, dev->width * sizeof(uint16_t));
@ -697,13 +715,15 @@ int hsdaoh_start_stream(hsdaoh_dev_t *dev, hsdaoh_read_cb_t cb, void *ctx)
if (HSDAOH_INACTIVE != dev->async_status)
return -2;
iqconverter_float_reset(dev->cnv_f);
dev->async_status = HSDAOH_RUNNING;
dev->async_cancel = 0;
dev->cb = cb;
dev->cb_ctx = ctx;
// dev->output_float = true;
dev->output_float = true;
uvc_error_t res;
uvc_stream_ctrl_t ctrl;