mirror of
https://github.com/rtlsdrblog/rtl-sdr-blog.git
synced 2025-01-11 18:57:19 +01:00
new api: rtlsdr_read_async function allows to specify buffer size
this commit deprecates rtlsdr_wait_async function various small fixes are included in this commit
This commit is contained in:
Dimitri Stolnikov
parent
554e1b62f2
commit
1eb1c3e191
@ -62,10 +62,46 @@ RTLSDR_API int rtlsdr_reset_buffer(rtlsdr_dev_t *dev);
|
||||
|
||||
RTLSDR_API int rtlsdr_read_sync(rtlsdr_dev_t *dev, void *buf, int len, int *n_read);
|
||||
|
||||
typedef void(*rtlsdr_async_read_cb_t)(unsigned char *buf, uint32_t len, void *ctx);
|
||||
typedef void(*rtlsdr_read_async_cb_t)(unsigned char *buf, uint32_t len, void *ctx);
|
||||
|
||||
RTLSDR_API int rtlsdr_wait_async(rtlsdr_dev_t *dev, rtlsdr_async_read_cb_t cb, void *ctx);
|
||||
/*!
|
||||
* Read samples from the device asynchronously. This function will block until
|
||||
* it is being canceled using rtlsdr_cancel_async()
|
||||
*
|
||||
* NOTE: This function is deprecated and is subject for removal.
|
||||
*
|
||||
* \param dev the device handle given by rtlsdr_open()
|
||||
* \param cb callback function to return received samples
|
||||
* \param ctx user specific context to pass via the callback function
|
||||
* \return 0 on success
|
||||
*/
|
||||
RTLSDR_API int rtlsdr_wait_async(rtlsdr_dev_t *dev, rtlsdr_read_async_cb_t cb, void *ctx);
|
||||
|
||||
/*!
|
||||
* Read samples from the device asynchronously. This function will block until
|
||||
* it is being canceled using rtlsdr_cancel_async()
|
||||
*
|
||||
* \param dev the device handle given by rtlsdr_open()
|
||||
* \param cb callback function to return received samples
|
||||
* \param ctx user specific context to pass via the callback function
|
||||
* \param buf_num optional buffer count, buf_num * buf_len = overall buffer size
|
||||
* set to 0 for default buffer count (32)
|
||||
* \param buf_len optional buffer length, must be multiple of 2,
|
||||
* set to 0 for default buffer length (16 * 16384)
|
||||
* \return 0 on success
|
||||
*/
|
||||
RTLSDR_API int rtlsdr_read_async(rtlsdr_dev_t *dev,
|
||||
rtlsdr_read_async_cb_t cb,
|
||||
void *ctx,
|
||||
uint32_t buf_num,
|
||||
uint32_t buf_len);
|
||||
|
||||
/*!
|
||||
* Cancel all pending asynchronous operations on the device.
|
||||
*
|
||||
* \param dev the device handle given by rtlsdr_open()
|
||||
* \return 0 on success
|
||||
*/
|
||||
RTLSDR_API int rtlsdr_cancel_async(rtlsdr_dev_t *dev);
|
||||
|
||||
#ifdef __cplusplus
|
||||
|
||||
28
src/main.c
28
src/main.c
@ -24,7 +24,7 @@
|
||||
#include <math.h>
|
||||
#include <unistd.h>
|
||||
|
||||
#include <rtl-sdr.h>
|
||||
#include "rtl-sdr.h"
|
||||
|
||||
#define READLEN (16 * 16384)
|
||||
|
||||
@ -33,7 +33,8 @@ static rtlsdr_dev_t *dev = NULL;
|
||||
|
||||
void usage(void)
|
||||
{
|
||||
printf("rtl-sdr, an I/Q recorder for RTL2832 based DVB-T receivers\n\n"
|
||||
fprintf(stderr,
|
||||
"rtl-sdr, an I/Q recorder for RTL2832 based DVB-T receivers\n\n"
|
||||
"Usage:\t -f frequency to tune to [Hz]\n"
|
||||
"\t[-s samplerate (default: 2048000 Hz)]\n"
|
||||
"\t[-d device index (default: 0)]\n"
|
||||
@ -48,8 +49,9 @@ static void sighandler(int signum)
|
||||
rtlsdr_cancel_async(dev);
|
||||
}
|
||||
|
||||
void rtlsdr_callback(unsigned char *buf, uint32_t len, void *ctx)
|
||||
static void rtlsdr_callback(unsigned char *buf, uint32_t len, void *ctx)
|
||||
{
|
||||
if (ctx)
|
||||
fwrite(buf, len, 1, (FILE*)ctx);
|
||||
}
|
||||
|
||||
@ -62,7 +64,8 @@ int main(int argc, char **argv)
|
||||
uint8_t buffer[READLEN];
|
||||
int n_read;
|
||||
FILE *file;
|
||||
uint32_t dev_index = 0, gain = 0;
|
||||
uint32_t dev_index = 0;
|
||||
int i, gain = 0;
|
||||
|
||||
while ((opt = getopt(argc, argv, "d:f:g:s:")) != -1) {
|
||||
switch (opt) {
|
||||
@ -96,8 +99,14 @@ int main(int argc, char **argv)
|
||||
exit(1);
|
||||
}
|
||||
|
||||
printf("Found %d device(s).\n", device_count);
|
||||
printf("Using %s\n", rtlsdr_get_device_name(dev_index));
|
||||
fprintf(stderr, "Found %d device(s):\n", device_count);
|
||||
for (i = 0; i < device_count; i++)
|
||||
fprintf(stderr, " %d: %s\n", i, rtlsdr_get_device_name(i));
|
||||
fprintf(stderr, "\n");
|
||||
|
||||
fprintf(stderr, "Using device %d: %s\n",
|
||||
dev_index,
|
||||
rtlsdr_get_device_name(dev_index));
|
||||
|
||||
r = rtlsdr_open(&dev, dev_index);
|
||||
if (r < 0) {
|
||||
@ -124,6 +133,7 @@ int main(int argc, char **argv)
|
||||
else
|
||||
fprintf(stderr, "Tuned to %u Hz.\n", frequency);
|
||||
|
||||
/* Set the tuner gain */
|
||||
r = rtlsdr_set_tuner_gain(dev, gain);
|
||||
if (r < 0)
|
||||
fprintf(stderr, "WARNING: Failed to set tuner gain.\n");
|
||||
@ -142,7 +152,7 @@ int main(int argc, char **argv)
|
||||
if (r < 0)
|
||||
fprintf(stderr, "WARNING: Failed to reset buffers.\n");
|
||||
|
||||
printf("Reading samples...\n");
|
||||
fprintf(stderr, "Reading samples...\n");
|
||||
#if 0
|
||||
while (!do_exit) {
|
||||
r = rtlsdr_read_sync(dev, buffer, READLEN, &n_read);
|
||||
@ -157,10 +167,10 @@ int main(int argc, char **argv)
|
||||
}
|
||||
}
|
||||
#else
|
||||
rtlsdr_wait_async(dev, rtlsdr_callback, (void *)file);
|
||||
rtlsdr_read_async(dev, rtlsdr_callback, (void *)file, 0, 0);
|
||||
#endif
|
||||
if (do_exit)
|
||||
printf("\nUser cancel, exiting...\n");
|
||||
fprintf(stderr, "\nUser cancel, exiting...\n");
|
||||
|
||||
fclose(file);
|
||||
|
||||
|
||||
142
src/rtl-sdr.c
142
src/rtl-sdr.c
@ -39,7 +39,7 @@
|
||||
#define LIBUSB_CALL
|
||||
#endif
|
||||
|
||||
#include <rtl-sdr.h>
|
||||
#include "rtl-sdr.h"
|
||||
#include "tuner_e4000.h"
|
||||
#include "tuner_fc0012.h"
|
||||
#include "tuner_fc0013.h"
|
||||
@ -62,7 +62,7 @@ void rtlsdr_set_gpio_bit(rtlsdr_dev_t *dev, uint8_t gpio, int val);
|
||||
int e4k_init(void *dev) { return e4000_Initialize(dev); }
|
||||
int e4k_exit(void *dev) { return 0; }
|
||||
int e4k_tune(void *dev, uint32_t freq) { return e4000_SetRfFreqHz(dev, freq); }
|
||||
int e4k_set_bw(void *dev, int bw) { return e4000_SetBandwidthHz(dev, 8000000); }
|
||||
int e4k_set_bw(void *dev, int bw) { return e4000_SetBandwidthHz(dev, 4000000); }
|
||||
int e4k_set_gain(void *dev, int gain) { return 0; }
|
||||
|
||||
int fc0012_init(void *dev) { return FC0012_Open(dev); }
|
||||
@ -136,15 +136,17 @@ static rtlsdr_device_t devices[] = {
|
||||
{ 0x1b80, 0xd39d, "SVEON STV20 DVB-T USB & FM" },
|
||||
};
|
||||
|
||||
#define BUF_COUNT 32
|
||||
#define BUF_LENGTH (16 * 16384)
|
||||
#define DEFAULT_BUF_NUMBER 32
|
||||
#define DEFAULT_BUF_LENGTH (16 * 16384)
|
||||
|
||||
struct rtlsdr_dev {
|
||||
libusb_context *ctx;
|
||||
struct libusb_device_handle *devh;
|
||||
struct libusb_transfer *xfer[BUF_COUNT];
|
||||
unsigned char *xfer_buf[BUF_COUNT];
|
||||
rtlsdr_async_read_cb_t cb;
|
||||
uint32_t xfer_buf_num;
|
||||
uint32_t xfer_buf_len;
|
||||
struct libusb_transfer **xfer;
|
||||
unsigned char **xfer_buf;
|
||||
rtlsdr_read_async_cb_t cb;
|
||||
void *cb_ctx;
|
||||
int run_async;
|
||||
rtlsdr_tuner_t *tuner;
|
||||
@ -560,6 +562,61 @@ rtlsdr_device_t *find_known_device(uint16_t vid, uint16_t pid)
|
||||
return device;
|
||||
}
|
||||
|
||||
static int _rtlsdr_alloc_async_buffers(rtlsdr_dev_t *dev)
|
||||
{
|
||||
int i;
|
||||
|
||||
if (!dev)
|
||||
return -1;
|
||||
|
||||
if (!dev->xfer) {
|
||||
dev->xfer = malloc(dev->xfer_buf_num *
|
||||
sizeof(struct libusb_transfer *));
|
||||
|
||||
for(i = 0; i < dev->xfer_buf_num; ++i)
|
||||
dev->xfer[i] = libusb_alloc_transfer(0);
|
||||
}
|
||||
|
||||
if (!dev->xfer_buf) {
|
||||
dev->xfer_buf = malloc(dev->xfer_buf_num *
|
||||
sizeof(unsigned char *));
|
||||
|
||||
for(i = 0; i < dev->xfer_buf_num; ++i)
|
||||
dev->xfer_buf[i] = malloc(dev->xfer_buf_len);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int _rtlsdr_free_async_buffers(rtlsdr_dev_t *dev)
|
||||
{
|
||||
int i;
|
||||
|
||||
if (!dev)
|
||||
return -1;
|
||||
|
||||
for(i = 0; i < dev->xfer_buf_num; ++i) {
|
||||
if (dev->xfer[i]) {
|
||||
libusb_cancel_transfer(dev->xfer[i]);
|
||||
libusb_free_transfer(dev->xfer[i]);
|
||||
}
|
||||
if (dev->xfer_buf[i])
|
||||
free(dev->xfer_buf[i]);
|
||||
}
|
||||
|
||||
if (dev->xfer) {
|
||||
free(dev->xfer);
|
||||
dev->xfer = NULL;
|
||||
}
|
||||
|
||||
if (dev->xfer_buf) {
|
||||
free(dev->xfer_buf);
|
||||
dev->xfer_buf = NULL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
uint32_t rtlsdr_get_device_count(void)
|
||||
{
|
||||
int i;
|
||||
@ -637,6 +694,9 @@ int rtlsdr_open(rtlsdr_dev_t **out_dev, uint32_t index)
|
||||
ssize_t cnt;
|
||||
|
||||
dev = malloc(sizeof(rtlsdr_dev_t));
|
||||
if (NULL == dev)
|
||||
return -ENOMEM;
|
||||
|
||||
memset(dev, 0, sizeof(rtlsdr_dev_t));
|
||||
|
||||
libusb_init(&dev->ctx);
|
||||
@ -751,12 +811,7 @@ int rtlsdr_close(rtlsdr_dev_t *dev)
|
||||
libusb_release_interface(dev->devh, 0);
|
||||
libusb_close(dev->devh);
|
||||
|
||||
for(i = 0; i < BUF_COUNT; ++i) {
|
||||
if (dev->xfer[i])
|
||||
libusb_free_transfer(dev->xfer[i]);
|
||||
if (dev->xfer_buf[i])
|
||||
free(dev->xfer_buf[i]);
|
||||
}
|
||||
_rtlsdr_free_async_buffers(dev);
|
||||
|
||||
libusb_exit(dev->ctx);
|
||||
|
||||
@ -784,22 +839,32 @@ int rtlsdr_read_sync(rtlsdr_dev_t *dev, void *buf, int len, int *n_read)
|
||||
return libusb_bulk_transfer(dev->devh, 0x81, buf, len, n_read, 3000);
|
||||
}
|
||||
|
||||
static void LIBUSB_CALL _libusb_callback(struct libusb_transfer *transfer)
|
||||
static void LIBUSB_CALL _libusb_callback(struct libusb_transfer *xfer)
|
||||
{
|
||||
if (LIBUSB_TRANSFER_COMPLETED == transfer->status) {
|
||||
rtlsdr_dev_t *dev = (rtlsdr_dev_t *)transfer->user_data;
|
||||
rtlsdr_dev_t *dev = (rtlsdr_dev_t *)xfer->user_data;
|
||||
|
||||
dev->cb(transfer->buffer, transfer->actual_length, dev->cb_ctx);
|
||||
if (LIBUSB_TRANSFER_COMPLETED == xfer->status) {
|
||||
if (dev->cb)
|
||||
dev->cb(xfer->buffer, xfer->actual_length, dev->cb_ctx);
|
||||
|
||||
libusb_submit_transfer(transfer); /* resubmit transfer */
|
||||
libusb_submit_transfer(xfer); /* resubmit transfer */
|
||||
} else {
|
||||
/*fprintf(stderr, "transfer %d\n", transfer->status);*/
|
||||
/*fprintf(stderr, "transfer status: %d\n", xfer->status);*/
|
||||
if (dev->run_async)
|
||||
dev->run_async = 0; /* abort async loop */
|
||||
}
|
||||
}
|
||||
|
||||
int rtlsdr_wait_async(rtlsdr_dev_t *dev, rtlsdr_async_read_cb_t cb, void *ctx)
|
||||
int rtlsdr_wait_async(rtlsdr_dev_t *dev, rtlsdr_read_async_cb_t cb, void *ctx)
|
||||
{
|
||||
rtlsdr_read_async(dev, cb, ctx, 0, 0);
|
||||
}
|
||||
|
||||
int rtlsdr_read_async(rtlsdr_dev_t *dev, rtlsdr_read_async_cb_t cb, void *ctx,
|
||||
uint32_t buf_num, uint32_t buf_len)
|
||||
{
|
||||
int i, r;
|
||||
struct timeval tv = { 1, 0 };
|
||||
|
||||
if (!dev)
|
||||
return -1;
|
||||
@ -807,27 +872,29 @@ int rtlsdr_wait_async(rtlsdr_dev_t *dev, rtlsdr_async_read_cb_t cb, void *ctx)
|
||||
dev->cb = cb;
|
||||
dev->cb_ctx = ctx;
|
||||
|
||||
for(i = 0; i < BUF_COUNT; ++i) {
|
||||
if (dev->xfer[i])
|
||||
continue;
|
||||
_rtlsdr_free_async_buffers(dev);
|
||||
|
||||
dev->xfer[i] = libusb_alloc_transfer(0);
|
||||
}
|
||||
if (buf_num > 0)
|
||||
dev->xfer_buf_num = buf_num;
|
||||
else
|
||||
dev->xfer_buf_num = DEFAULT_BUF_NUMBER;
|
||||
|
||||
for(i = 0; i < BUF_COUNT; ++i) {
|
||||
if (dev->xfer_buf[i])
|
||||
continue;
|
||||
if (buf_len > 0 && buf_len % 2 == 0) /* len must be multiple of 2 */
|
||||
dev->xfer_buf_len = buf_len;
|
||||
else
|
||||
dev->xfer_buf_len = DEFAULT_BUF_LENGTH;
|
||||
|
||||
dev->xfer_buf[i] = (unsigned char *)malloc(BUF_LENGTH);
|
||||
}
|
||||
_rtlsdr_alloc_async_buffers(dev);
|
||||
|
||||
for(i = 0; i < BUF_COUNT; ++i) {
|
||||
for(i = 0; i < dev->xfer_buf_num; ++i) {
|
||||
libusb_fill_bulk_transfer(dev->xfer[i],
|
||||
dev->devh,
|
||||
0x81,
|
||||
dev->xfer_buf[i], BUF_LENGTH,
|
||||
dev->xfer_buf[i],
|
||||
dev->xfer_buf_len,
|
||||
_libusb_callback,
|
||||
(void *)dev, 0);
|
||||
(void *)dev,
|
||||
3000);
|
||||
|
||||
libusb_submit_transfer(dev->xfer[i]);
|
||||
}
|
||||
@ -835,14 +902,19 @@ int rtlsdr_wait_async(rtlsdr_dev_t *dev, rtlsdr_async_read_cb_t cb, void *ctx)
|
||||
dev->run_async = 1;
|
||||
|
||||
while (dev->run_async) {
|
||||
struct timeval tv = { 1, 0 };
|
||||
r = libusb_handle_events_timeout(dev->ctx, &tv);
|
||||
if (r < 0) {
|
||||
/*fprintf(stderr, "handle_events %d\n", r);*/
|
||||
/*fprintf(stderr, "handle_events returned: %d\n", r);*/
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
for(i = 0; i < dev->xfer_buf_num; ++i) {
|
||||
if (dev->xfer[i]) {
|
||||
libusb_cancel_transfer(dev->xfer[i]);
|
||||
}
|
||||
}
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user