sdrangel/plugins/samplesource/v4l/v4lsource.cpp

298 lines
7.6 KiB
C++

/*
* Copyright 2013 Antti Palosaari <crope@iki.fi>
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "v4lsource.h"
#include "v4linput.h"
/* Control classes */
#define V4L2_CTRL_CLASS_USER 0x00980000 /* Old-style 'user' controls */
/* User-class control IDs */
#define V4L2_CID_BASE (V4L2_CTRL_CLASS_USER | 0x900)
#define V4L2_CID_USER_BASE V4L2_CID_BASE
#define CID_SAMPLING_MODE ((V4L2_CID_USER_BASE | 0xf000) + 0)
#define CID_SAMPLING_RATE ((V4L2_CID_USER_BASE | 0xf000) + 1)
#define CID_SAMPLING_RESOLUTION ((V4L2_CID_USER_BASE | 0xf000) + 2)
#define CID_TUNER_RF ((V4L2_CID_USER_BASE | 0xf000) + 10)
#define CID_TUNER_BW ((V4L2_CID_USER_BASE | 0xf000) + 11)
#define CID_TUNER_IF ((V4L2_CID_USER_BASE | 0xf000) + 12)
#define CID_TUNER_GAIN ((V4L2_CID_USER_BASE | 0xf000) + 13)
#define V4L2_PIX_FMT_SDR_U8 v4l2_fourcc('C', 'U', '0', '8') /* unsigned 8-bit Complex*/
#define V4L2_PIX_FMT_SDR_U16LE v4l2_fourcc('C', 'U', '1', '6') /* unsigned 16-bit Complex*/
#define CLEAR(x) memset(&(x), 0, sizeof(x))
static void xioctl(int fh, unsigned long int request, void *arg)
{
int ret;
do {
ret = v4l2_ioctl(fh, request, arg);
} while (ret == -1 && ((errno == EINTR) || (errno == EAGAIN)));
if (ret == -1) {
fprintf(stderr, "error %d\n", errno);
}
}
void
V4LInput::OpenSource(const char *filename)
{
struct v4l2_format fmt;
struct v4l2_buffer buf;
struct v4l2_requestbuffers req;
enum v4l2_buf_type type;
unsigned int i;
recebuf_len = 0;
// libv4l2 does not know SDR yet
// fd = v4l2_open(filename, O_RDWR | O_NONBLOCK, 0);
fd = open(filename, O_RDWR | O_NONBLOCK, 0);
if (fd < 0) {
perror("Cannot open device");
}
pixelformat = V4L2_PIX_FMT_SDR_U8;
//pixelformat = V4L2_PIX_FMT_SDR_U16LE;
CLEAR(fmt);
fmt.type = V4L2_BUF_TYPE_SDR_CAPTURE;
fmt.fmt.sdr.pixelformat = pixelformat;
xioctl(fd, VIDIOC_S_FMT, &fmt);
if (fmt.fmt.sdr.pixelformat != pixelformat) {
printf("Libv4l didn't accept FLOAT format. Cannot proceed. Pixelformat %4.4s\n",
(char *)&fmt.fmt.sdr.pixelformat);
}
printf("Selected stream format: %4.4s\n", (char *)&fmt.fmt.sdr.pixelformat);
CLEAR(req);
req.count = 8;
req.type = V4L2_BUF_TYPE_SDR_CAPTURE;
req.memory = V4L2_MEMORY_MMAP;
xioctl(fd, VIDIOC_REQBUFS, &req);
buffers = (struct v4l_buffer*) calloc(req.count, sizeof(*buffers));
for (n_buffers = 0; n_buffers < req.count; n_buffers++) {
CLEAR(buf);
buf.type = V4L2_BUF_TYPE_SDR_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = n_buffers;
xioctl(fd, VIDIOC_QUERYBUF, &buf);
buffers[n_buffers].length = buf.length;
buffers[n_buffers].start = v4l2_mmap(NULL, buf.length,
PROT_READ | PROT_WRITE, MAP_SHARED,
fd, buf.m.offset);
if (buffers[n_buffers].start == MAP_FAILED) {
perror("mmap");
}
}
for (i = 0; i < n_buffers; i++) {
CLEAR(buf);
buf.type = V4L2_BUF_TYPE_SDR_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = i;
xioctl(fd, VIDIOC_QBUF, &buf);
}
// start streaming
type = V4L2_BUF_TYPE_SDR_CAPTURE;
xioctl(fd, VIDIOC_STREAMON, &type);
}
void
V4LInput::CloseSource()
{
unsigned int i;
enum v4l2_buf_type type;
// stop streaming
type = V4L2_BUF_TYPE_SDR_CAPTURE;
xioctl(fd, VIDIOC_STREAMOFF, &type);
for (i = 0; i < n_buffers; i++)
v4l2_munmap(buffers[i].start, buffers[i].length);
v4l2_close(fd);
}
void
V4LInput::set_sample_rate(double samp_rate)
{
struct v4l2_frequency frequency;
memset (&frequency, 0, sizeof(frequency));
frequency.tuner = 0;
frequency.type = V4L2_TUNER_ADC;
frequency.frequency = samp_rate / 1;
if (v4l2_ioctl(fd, VIDIOC_S_FREQUENCY, &frequency) == -1)
perror("VIDIOC_S_FREQUENCY");
return;
}
void
V4LInput::set_center_freq(double freq)
{
struct v4l2_frequency frequency;
memset (&frequency, 0, sizeof(frequency));
frequency.tuner = 1;
frequency.type = V4L2_TUNER_RF;
frequency.frequency = freq;
if (v4l2_ioctl(fd, VIDIOC_S_FREQUENCY, &frequency) == -1)
perror("VIDIOC_S_FREQUENCY");
return;
}
void
V4LInput::set_bandwidth(double bandwidth)
{
struct v4l2_ext_controls ext_ctrls;
struct v4l2_ext_control ext_ctrl;
memset (&ext_ctrl, 0, sizeof(ext_ctrl));
ext_ctrl.id = CID_TUNER_BW;
ext_ctrl.value = bandwidth;
memset (&ext_ctrls, 0, sizeof(ext_ctrls));
ext_ctrls.ctrl_class = V4L2_CTRL_CLASS_USER;
ext_ctrls.count = 1;
ext_ctrls.controls = &ext_ctrl;
if (v4l2_ioctl(fd, VIDIOC_S_EXT_CTRLS, &ext_ctrls) == -1)
perror("VIDIOC_S_EXT_CTRLS");
return;
}
void
V4LInput::set_tuner_gain(double gain)
{
struct v4l2_ext_controls ext_ctrls;
struct v4l2_ext_control ext_ctrl;
memset (&ext_ctrl, 0, sizeof(ext_ctrl));
ext_ctrl.id = CID_TUNER_GAIN;
ext_ctrl.value = gain;
memset (&ext_ctrls, 0, sizeof(ext_ctrls));
ext_ctrls.ctrl_class = V4L2_CTRL_CLASS_USER;
ext_ctrls.count = 1;
ext_ctrls.controls = &ext_ctrl;
if (v4l2_ioctl(fd, VIDIOC_S_EXT_CTRLS, &ext_ctrls) == -1)
perror("VIDIOC_S_EXT_CTRLS");
return;
}
int
V4LInput::work(int noutput_items,
void* input_items,
void* output_items)
{
//complex *out = (complex *) output_items;
int ret;
struct timeval tv;
struct v4l2_buffer buf;
fd_set fds;
unsigned int i, items = 0;
float *fptr = (float *) output_items;
process_buf:
/* process received mmap buffer */
uint8_t *u8src = (uint8_t *) recebuf_ptr;
uint16_t *u16src = (uint16_t *) recebuf_ptr;
while (recebuf_len) {
if (pixelformat == V4L2_PIX_FMT_SDR_U8) {
*fptr++ = (*u8src++ - 127.5f) / 127.5f;
*fptr++ = (*u8src++ - 127.5f) / 127.5f;
recebuf_len -= 2;
items++;
recebuf_ptr = u8src;
} else if (pixelformat == V4L2_PIX_FMT_SDR_U16LE) {
*fptr++ = (*u16src++ - 32767.5f) / 32767.5f;
*fptr++ = (*u16src++ - 32767.5f) / 32767.5f;
recebuf_len -= 4;
items++;
recebuf_ptr = u16src;
} else {
recebuf_len = 0;
}
if (items == noutput_items)
break;
}
/* enqueue mmap buf after it is processed */
if (recebuf_len == 0 && items != 0) {
CLEAR(buf);
buf.type = V4L2_BUF_TYPE_SDR_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = recebuf_mmap_index;
xioctl(fd, VIDIOC_QBUF, &buf);
}
/* signal DSP we have some samples to offer */
if (items)
return items;
/* Read data from device */
do {
FD_ZERO(&fds);
FD_SET(fd, &fds);
// Timeout
tv.tv_sec = 2;
tv.tv_usec = 0;
ret = select(fd + 1, &fds, NULL, NULL, &tv);
} while ((ret == -1 && (errno = EINTR)));
if (ret == -1) {
perror("select");
return errno;
}
/* dequeue mmap buf (receive data) */
CLEAR(buf);
buf.type = V4L2_BUF_TYPE_SDR_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
xioctl(fd, VIDIOC_DQBUF, &buf);
/* store buffer in order to handle it during next call */
recebuf_ptr = buffers[buf.index].start;
recebuf_len = buf.bytesused;
recebuf_mmap_index = buf.index;
/* FIXME: */
goto process_buf;
// Tell runtime system how many output items we produced.
return 0;
}