mirror of
https://github.com/f4exb/sdrangel.git
synced 2026-06-01 21:54:55 -04:00
Borrow layer from GnuRadio Plugin.
This commit is contained in:
John Greb
@@ -0,0 +1,301 @@
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/*
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* Copyright 2013 Antti Palosaari <crope@iki.fi>
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "v4lsource.h"
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/* Control classes */
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#define V4L2_CTRL_CLASS_USER 0x00980000 /* Old-style 'user' controls */
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/* User-class control IDs */
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#define V4L2_CID_BASE (V4L2_CTRL_CLASS_USER | 0x900)
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#define V4L2_CID_USER_BASE V4L2_CID_BASE
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#define CID_SAMPLING_MODE ((V4L2_CID_USER_BASE | 0xf000) + 0)
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#define CID_SAMPLING_RATE ((V4L2_CID_USER_BASE | 0xf000) + 1)
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#define CID_SAMPLING_RESOLUTION ((V4L2_CID_USER_BASE | 0xf000) + 2)
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#define CID_TUNER_RF ((V4L2_CID_USER_BASE | 0xf000) + 10)
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#define CID_TUNER_BW ((V4L2_CID_USER_BASE | 0xf000) + 11)
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#define CID_TUNER_IF ((V4L2_CID_USER_BASE | 0xf000) + 12)
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#define CID_TUNER_GAIN ((V4L2_CID_USER_BASE | 0xf000) + 13)
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#define V4L2_PIX_FMT_SDR_U8 v4l2_fourcc('D', 'U', '0', '8') /* unsigned 8-bit */
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#define V4L2_PIX_FMT_SDR_U16LE v4l2_fourcc('D', 'U', '1', '6') /* unsigned 16-bit LE */
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#define CLEAR(x) memset(&(x), 0, sizeof(x))
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static void xioctl(int fh, unsigned long int request, void *arg)
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{
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int ret;
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do {
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ret = v4l2_ioctl(fh, request, arg);
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} while (ret == -1 && ((errno == EINTR) || (errno == EAGAIN)));
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if (ret == -1) {
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fprintf(stderr, "error %d\n", errno);
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}
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}
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namespace kernel{
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v4l::v4l(const char *filename)
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{
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struct v4l2_format fmt;
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struct v4l2_buffer buf;
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struct v4l2_requestbuffers req;
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enum v4l2_buf_type type;
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unsigned int i;
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recebuf_len = 0;
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// libv4l2 does not know SDR yet
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// fd = v4l2_open(filename, O_RDWR | O_NONBLOCK, 0);
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fd = open(filename, O_RDWR | O_NONBLOCK, 0);
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if (fd < 0) {
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perror("Cannot open device");
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}
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pixelformat = V4L2_PIX_FMT_SDR_U8;
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//pixelformat = V4L2_PIX_FMT_SDR_U16LE;
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CLEAR(fmt);
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fmt.type = V4L2_BUF_TYPE_SDR_CAPTURE;
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fmt.fmt.sdr.pixelformat = pixelformat;
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xioctl(fd, VIDIOC_S_FMT, &fmt);
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if (fmt.fmt.sdr.pixelformat != pixelformat) {
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printf("Libv4l didn't accept FLOAT format. Cannot proceed. Pixelformat %4.4s\n",
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(char *)&fmt.fmt.sdr.pixelformat);
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}
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printf("Selected stream format: %4.4s\n", (char *)&fmt.fmt.sdr.pixelformat);
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CLEAR(req);
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req.count = 8;
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req.type = V4L2_BUF_TYPE_SDR_CAPTURE;
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req.memory = V4L2_MEMORY_MMAP;
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xioctl(fd, VIDIOC_REQBUFS, &req);
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buffers = (struct buffer*) calloc(req.count, sizeof(*buffers));
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for (n_buffers = 0; n_buffers < req.count; n_buffers++) {
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CLEAR(buf);
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buf.type = V4L2_BUF_TYPE_SDR_CAPTURE;
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buf.memory = V4L2_MEMORY_MMAP;
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buf.index = n_buffers;
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xioctl(fd, VIDIOC_QUERYBUF, &buf);
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buffers[n_buffers].length = buf.length;
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buffers[n_buffers].start = v4l2_mmap(NULL, buf.length,
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PROT_READ | PROT_WRITE, MAP_SHARED,
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fd, buf.m.offset);
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if (buffers[n_buffers].start == MAP_FAILED) {
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perror("mmap");
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}
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}
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for (i = 0; i < n_buffers; i++) {
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CLEAR(buf);
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buf.type = V4L2_BUF_TYPE_SDR_CAPTURE;
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buf.memory = V4L2_MEMORY_MMAP;
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buf.index = i;
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xioctl(fd, VIDIOC_QBUF, &buf);
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}
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// start streaming
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type = V4L2_BUF_TYPE_SDR_CAPTURE;
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xioctl(fd, VIDIOC_STREAMON, &type);
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}
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/*
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* Our virtual destructor.
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*/
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v4l::~v4l()
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{
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unsigned int i;
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enum v4l2_buf_type type;
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// stop streaming
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type = V4L2_BUF_TYPE_SDR_CAPTURE;
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xioctl(fd, VIDIOC_STREAMOFF, &type);
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for (i = 0; i < n_buffers; i++)
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v4l2_munmap(buffers[i].start, buffers[i].length);
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v4l2_close(fd);
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}
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void
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v4l::set_samp_rate(double samp_rate)
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{
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struct v4l2_frequency frequency;
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memset (&frequency, 0, sizeof(frequency));
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frequency.tuner = 0;
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frequency.type = V4L2_TUNER_ADC;
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frequency.frequency = samp_rate / 1;
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if (v4l2_ioctl(fd, VIDIOC_S_FREQUENCY, &frequency) == -1)
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perror("VIDIOC_S_FREQUENCY");
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return;
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}
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void
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v4l::set_center_freq(double freq)
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{
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struct v4l2_frequency frequency;
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memset (&frequency, 0, sizeof(frequency));
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frequency.tuner = 1;
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frequency.type = V4L2_TUNER_RF;
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frequency.frequency = freq;
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if (v4l2_ioctl(fd, VIDIOC_S_FREQUENCY, &frequency) == -1)
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perror("VIDIOC_S_FREQUENCY");
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return;
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}
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void
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v4l::set_bandwidth(double bandwidth)
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{
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struct v4l2_ext_controls ext_ctrls;
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struct v4l2_ext_control ext_ctrl;
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memset (&ext_ctrl, 0, sizeof(ext_ctrl));
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ext_ctrl.id = CID_TUNER_BW;
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ext_ctrl.value = bandwidth;
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memset (&ext_ctrls, 0, sizeof(ext_ctrls));
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ext_ctrls.ctrl_class = V4L2_CTRL_CLASS_USER;
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ext_ctrls.count = 1;
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ext_ctrls.controls = &ext_ctrl;
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if (v4l2_ioctl(fd, VIDIOC_S_EXT_CTRLS, &ext_ctrls) == -1)
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perror("VIDIOC_S_EXT_CTRLS");
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return;
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}
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void
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v4l::set_tuner_gain(double gain)
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{
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struct v4l2_ext_controls ext_ctrls;
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struct v4l2_ext_control ext_ctrl;
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memset (&ext_ctrl, 0, sizeof(ext_ctrl));
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ext_ctrl.id = CID_TUNER_GAIN;
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ext_ctrl.value = gain;
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memset (&ext_ctrls, 0, sizeof(ext_ctrls));
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ext_ctrls.ctrl_class = V4L2_CTRL_CLASS_USER;
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ext_ctrls.count = 1;
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ext_ctrls.controls = &ext_ctrl;
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if (v4l2_ioctl(fd, VIDIOC_S_EXT_CTRLS, &ext_ctrls) == -1)
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perror("VIDIOC_S_EXT_CTRLS");
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return;
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}
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int
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v4l::work(int noutput_items,
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void* input_items,
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void* output_items)
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{
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//complex *out = (complex *) output_items;
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int ret;
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struct timeval tv;
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struct v4l2_buffer buf;
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fd_set fds;
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unsigned int i, items = 0;
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float *fptr = (float *) output_items;
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process_buf:
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/* process received mmap buffer */
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uint8_t *u8src = (uint8_t *) recebuf_ptr;
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uint16_t *u16src = (uint16_t *) recebuf_ptr;
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while (recebuf_len) {
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if (pixelformat == V4L2_PIX_FMT_SDR_U8) {
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*fptr++ = (*u8src++ - 127.5f) / 127.5f;
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*fptr++ = (*u8src++ - 127.5f) / 127.5f;
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recebuf_len -= 2;
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items++;
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recebuf_ptr = u8src;
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} else if (pixelformat == V4L2_PIX_FMT_SDR_U16LE) {
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*fptr++ = (*u16src++ - 32767.5f) / 32767.5f;
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*fptr++ = (*u16src++ - 32767.5f) / 32767.5f;
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recebuf_len -= 4;
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items++;
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recebuf_ptr = u16src;
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} else {
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recebuf_len = 0;
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}
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if (items == noutput_items)
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break;
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}
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/* enqueue mmap buf after it is processed */
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if (recebuf_len == 0 && items != 0) {
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CLEAR(buf);
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buf.type = V4L2_BUF_TYPE_SDR_CAPTURE;
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buf.memory = V4L2_MEMORY_MMAP;
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buf.index = recebuf_mmap_index;
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xioctl(fd, VIDIOC_QBUF, &buf);
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}
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/* signal DSP we have some samples to offer */
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if (items)
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return items;
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/* Read data from device */
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do {
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FD_ZERO(&fds);
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FD_SET(fd, &fds);
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// Timeout
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tv.tv_sec = 2;
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tv.tv_usec = 0;
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ret = select(fd + 1, &fds, NULL, NULL, &tv);
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} while ((ret == -1 && (errno = EINTR)));
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if (ret == -1) {
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perror("select");
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return errno;
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}
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/* dequeue mmap buf (receive data) */
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CLEAR(buf);
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buf.type = V4L2_BUF_TYPE_SDR_CAPTURE;
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buf.memory = V4L2_MEMORY_MMAP;
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xioctl(fd, VIDIOC_DQBUF, &buf);
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/* store buffer in order to handle it during next call */
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recebuf_ptr = buffers[buf.index].start;
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recebuf_len = buf.bytesused;
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recebuf_mmap_index = buf.index;
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/* FIXME: */
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goto process_buf;
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// Tell runtime system how many output items we produced.
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return 0;
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}
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} /* namespace kernel */
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