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/* -*- c++ -*- */
/*
* Copyright 2004-2011,2013 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "../audio_registry.h"
#include "oss_sink.h"
#include <gnuradio/io_signature.h>
#include <gnuradio/prefs.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <cstdio>
#include <stdexcept>
namespace gr {
namespace audio {
sink::sptr
oss_sink_fcn(int sampling_rate, const std::string& device_name, bool ok_to_block)
{
return sink::sptr(new oss_sink(sampling_rate, device_name, ok_to_block));
}
static std::string default_device_name()
{
return prefs::singleton()->get_string(
"audio_oss", "default_output_device", "/dev/dsp");
}
oss_sink::oss_sink(int sampling_rate, const std::string device_name, bool ok_to_block)
: sync_block("audio_oss_sink",
io_signature::make(1, 2, sizeof(float)),
io_signature::make(0, 0, 0)),
d_sampling_rate(sampling_rate),
d_device_name(device_name.empty() ? default_device_name() : device_name),
d_fd(-1),
d_buffer(0),
d_chunk_size(0)
{
if ((d_fd = open(d_device_name.c_str(), O_WRONLY)) < 0) {
GR_LOG_ERROR(d_logger,
boost::format("opening device %s: %s") % d_device_name %
strerror(errno));
throw std::runtime_error("audio_oss_sink");
}
double CHUNK_TIME =
std::max(0.001, prefs::singleton()->get_double("audio_oss", "latency", 0.005));
d_chunk_size = (int)(d_sampling_rate * CHUNK_TIME);
set_output_multiple(d_chunk_size);
d_buffer = new short[d_chunk_size * 2];
int format = AFMT_S16_NE;
int orig_format = format;
if (ioctl(d_fd, SNDCTL_DSP_SETFMT, &format) < 0) {
GR_LOG_ERROR(d_logger,
boost::format("%s ioctl failed: %s") % d_device_name %
strerror(errno));
throw std::runtime_error("audio_oss_sink");
}
if (format != orig_format) {
GR_LOG_ERROR(
d_logger,
boost::format("%s unable to support format %d. card requested %d instead.") %
orig_format % format);
}
// set to stereo no matter what. Some hardware only does stereo
int channels = 2;
if (ioctl(d_fd, SNDCTL_DSP_CHANNELS, &channels) < 0 || channels != 2) {
GR_LOG_ERROR(d_logger,
boost::format("could not set STEREO mode: %s") % strerror(errno));
throw std::runtime_error("audio_oss_sink");
}
// set sampling freq
int sf = sampling_rate;
if (ioctl(d_fd, SNDCTL_DSP_SPEED, &sf) < 0) {
GR_LOG_ERROR(d_logger,
boost::format("%s: invalid sampling_rate %d") % d_device_name %
sampling_rate);
sampling_rate = 8000;
if (ioctl(d_fd, SNDCTL_DSP_SPEED, &sf) < 0) {
GR_LOG_ERROR(d_logger, "failed to set sampling_rate to 8000");
throw std::runtime_error("audio_oss_sink");
}
}
}
oss_sink::~oss_sink()
{
close(d_fd);
delete[] d_buffer;
}
int oss_sink::work(int noutput_items,
gr_vector_const_void_star& input_items,
gr_vector_void_star& output_items)
{
const float *f0, *f1;
switch (input_items.size()) {
case 1: // mono input
f0 = (const float*)input_items[0];
for (int i = 0; i < noutput_items; i += d_chunk_size) {
for (int j = 0; j < d_chunk_size; j++) {
d_buffer[2 * j + 0] = (short)(f0[j] * 32767);
d_buffer[2 * j + 1] = (short)(f0[j] * 32767);
}
f0 += d_chunk_size;
if (write(d_fd, d_buffer, 2 * d_chunk_size * sizeof(short)) < 0)
GR_LOG_ERROR(d_logger, boost::format("write %s") % strerror(errno));
}
break;
case 2: // stereo input
f0 = (const float*)input_items[0];
f1 = (const float*)input_items[1];
for (int i = 0; i < noutput_items; i += d_chunk_size) {
for (int j = 0; j < d_chunk_size; j++) {
d_buffer[2 * j + 0] = (short)(f0[j] * 32767);
d_buffer[2 * j + 1] = (short)(f1[j] * 32767);
}
f0 += d_chunk_size;
f1 += d_chunk_size;
if (write(d_fd, d_buffer, 2 * d_chunk_size * sizeof(short)) < 0)
GR_LOG_ERROR(d_logger, boost::format("write %s") % strerror(errno));
}
break;
}
return noutput_items;
}
} /* namespace audio */
} /* namespace gr */
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