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/* -*- c++ -*- */
/*
* Copyright 2004-2011 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio 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.
*
* GNU Radio 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 GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gr_audio_registry.h"
#include <audio_oss_sink.h>
#include <gr_io_signature.h>
#include <gr_prefs.h>
#include <sys/soundcard.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <iostream>
#include <stdexcept>
AUDIO_REGISTER_SINK(REG_PRIO_LOW, oss)(
int sampling_rate, const std::string &device_name, bool ok_to_block
){
return audio_sink::sptr(new audio_oss_sink(sampling_rate, device_name, ok_to_block));
}
static std::string
default_device_name ()
{
return gr_prefs::singleton()->get_string("audio_oss", "default_output_device", "/dev/dsp");
}
audio_oss_sink::audio_oss_sink (int sampling_rate,
const std::string device_name,
bool ok_to_block)
: audio_sink ("audio_oss_sink",
gr_make_io_signature (1, 2, sizeof (float)),
gr_make_io_signature (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){
fprintf (stderr, "audio_oss_sink: ");
perror (d_device_name.c_str ());
throw std::runtime_error ("audio_oss_sink");
}
double CHUNK_TIME =
std::max(0.001, gr_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){
std::cerr << "audio_oss_sink: " << d_device_name << " ioctl failed\n";
perror (d_device_name.c_str ());
throw std::runtime_error ("audio_oss_sink");
}
if (format != orig_format){
fprintf (stderr, "audio_oss_sink: unable to support format %d\n", orig_format);
fprintf (stderr, " card requested %d instead.\n", 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){
perror ("audio_oss_sink: could not set STEREO mode");
throw std::runtime_error ("audio_oss_sink");
}
// set sampling freq
int sf = sampling_rate;
if (ioctl (d_fd, SNDCTL_DSP_SPEED, &sf) < 0){
std::cerr << "audio_oss_sink: "
<< d_device_name << ": invalid sampling_rate "
<< sampling_rate << "\n";
sampling_rate = 8000;
if (ioctl (d_fd, SNDCTL_DSP_SPEED, &sf) < 0){
std::cerr << "audio_oss_sink: failed to set sampling_rate to 8000\n";
throw std::runtime_error ("audio_oss_sink");
}
}
}
audio_oss_sink::~audio_oss_sink ()
{
close (d_fd);
delete [] d_buffer;
}
int
audio_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)
perror ("audio_oss_sink: write");
}
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)
perror ("audio_oss_sink: write");
}
break;
}
return noutput_items;
}
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