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/* -*- c++ -*- */
/*
* Copyright 2004,2010 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 <audio_oss_source.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>
static std::string
default_device_name ()
{
return gr_prefs::singleton()->get_string("audio_oss", "default_input_device", "/dev/dsp");
}
audio_oss_source_sptr
audio_oss_make_source (int sampling_rate, const std::string dev, bool ok_to_block)
{
return gnuradio::get_initial_sptr(new audio_oss_source (sampling_rate, dev, ok_to_block));
}
audio_oss_source::audio_oss_source (int sampling_rate,
const std::string device_name,
bool ok_to_block)
: gr_sync_block ("audio_oss_source",
gr_make_io_signature (0, 0, 0),
gr_make_io_signature (1, 2, sizeof (float))),
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_RDONLY)) < 0){
fprintf (stderr, "audio_oss_source: ");
perror (d_device_name.c_str ());
throw std::runtime_error ("audio_oss_source");
}
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_source: " << d_device_name << " ioctl failed\n";
perror (d_device_name.c_str ());
throw std::runtime_error ("audio_oss_source");
}
if (format != orig_format){
fprintf (stderr, "audio_oss_source: 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_source: could not set STEREO mode");
throw std::runtime_error ("audio_oss_source");
}
// set sampling freq
int sf = sampling_rate;
if (ioctl (d_fd, SNDCTL_DSP_SPEED, &sf) < 0){
std::cerr << "audio_oss_source: "
<< 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_source: failed to set sampling_rate to 8000\n";
throw std::runtime_error ("audio_oss_source");
}
}
}
audio_oss_source::~audio_oss_source ()
{
close (d_fd);
delete [] d_buffer;
}
int
audio_oss_source::work (int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
float *f0 = (float *) output_items[0];
float *f1 = (float *) output_items[1]; // will be invalid if this is mono output
const int shorts_per_item = 2; // L + R
const int bytes_per_item = shorts_per_item * sizeof (short);
// To minimize latency, never return more than CHUNK_TIME
// worth of samples per call to work.
noutput_items = std::min (noutput_items, d_chunk_size);
int base = 0;
int ntogo = noutput_items;
while (ntogo > 0){
int nbytes = std::min (ntogo, d_chunk_size) * bytes_per_item;
int result_nbytes = read (d_fd, d_buffer, nbytes);
if (result_nbytes < 0){
perror ("audio_oss_source");
return -1; // say we're done
}
if ((result_nbytes & (bytes_per_item - 1)) != 0){
fprintf (stderr, "audio_oss_source: internal error.\n");
throw std::runtime_error ("internal error");
}
int result_nitems = result_nbytes / bytes_per_item;
// now unpack samples into output streams
switch (output_items.size ()){
case 1: // mono output
for (int i = 0; i < result_nitems; i++){
f0[base+i] = d_buffer[2*i+0] * (1.0 / 32767);
}
break;
case 2: // stereo output
for (int i = 0; i < result_nitems; i++){
f0[base+i] = d_buffer[2*i+0] * (1.0 / 32767);
f1[base+i] = d_buffer[2*i+1] * (1.0 / 32767);
}
break;
default:
assert (0);
}
ntogo -= result_nitems;
base += result_nitems;
}
return noutput_items - ntogo;
}
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