1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
/* -*- c++ -*- */
/*
* Copyright 2004 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 2, 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_windows_source.h>
#include <gr_io_signature.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 const double CHUNK_TIME = 0.005; // 5 ms
// FIXME these should query some kind of user preference
static std::string
default_device_name ()
{
return "/dev/dsp";
}
audio_windows_source::audio_windows_source (int sampling_freq, const std::string device_name)
: gr_sync_block ("audio_windows_source",
gr_make_io_signature (0, 0, 0),
gr_make_io_signature (1, 2, sizeof (float))),
d_sampling_freq (sampling_freq),
d_device_name (device_name.empty ()? default_device_name () : device_name),
d_fd (-1), d_buffer (0), d_chunk_size (0)
{
//FIXME TODO implement me
#if 0
if ((d_fd = open (d_device_name.c_str (), O_RDONLY)) < 0)
{
fprintf (stderr, "audio_windows_source: ");
perror (d_device_name.c_str ());
throw
std::runtime_error ("audio_windows_source");
}
d_chunk_size = (int) (d_sampling_freq * 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_windows_source: " << d_device_name <<
" ioctl failed\n";
perror (d_device_name.c_str ());
throw
std::runtime_error ("audio_windows_source");
}
if (format != orig_format)
{
fprintf (stderr, "audio_windows_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_windows_source: could not set STEREO mode");
throw
std::runtime_error ("audio_windows_source");
}
// set sampling freq
int sf = sampling_freq;
if (ioctl (d_fd, SNDCTL_DSP_SPEED, &sf) < 0)
{
std::cerr << "audio_windows_source: "
<< d_device_name << ": invalid sampling_freq "
<< sampling_freq << "\n";
sampling_freq = 8000;
if (ioctl (d_fd, SNDCTL_DSP_SPEED, &sf) < 0)
{
std::
cerr <<
"audio_windows_source: failed to set sampling_freq to 8000\n";
throw
std::runtime_error ("audio_windows_source");
}
}
#endif
}
audio_windows_source::~audio_windows_source ()
{
/*close (d_fd);
delete [] d_buffer;
*/
}
audio_windows_source_sptr
audio_windows_make_source (int sampling_freq, const std::string dev)
{
return audio_windows_source_sptr (new
audio_windows_source (sampling_freq,
dev));
}
int
audio_windows_source::work (int noutput_items,
gr_vector_const_void_star & input_items,
gr_vector_void_star & output_items)
{
//FIXME TODO implement me
#if 0
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.
// FIXME, we need an API to set this value
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_windows_source");
return -1; // say we're done
}
if ((result_nbytes & (bytes_per_item - 1)) != 0)
{
fprintf (stderr, "audio_windows_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;
#endif
return -1; // EOF
}
|
