summaryrefslogtreecommitdiff
path: root/src/audiobackend-pulse.cc
blob: 3b39d22d652437e619f9a23893539af300971f29 (plain)
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
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
 *            audiobackend-pulse.cc
 *
 *  Wed Sep 24 07:47:47 CEST 2014
 *  Copyright 2014 Bent Bisballe Nyeng
 *  deva@aasimon.org
 ****************************************************************************/

/*
 *  This file is part of SimpleRTP.
 *
 *  SimpleRTP 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 of the License, or
 *  (at your option) any later version.
 *
 *  SimpleRTP 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 SimpleRTP; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */
#include "audiobackend-pulse.h"
#include "mediaconfig.h"
#include "stdio.h"

#ifdef WITH_PULSE

#include <pulse/simple.h>
#include <pulse/error.h>

/*
Input example:
http://freedesktop.org/software/pulseaudio/doxygen/pacat-simple_8c-example.html

Output example:
http://freedesktop.org/software/pulseaudio/doxygen/parec-simple_8c-example.html
*/

static const pa_sample_spec ss = {
  .format = PA_SAMPLE_S16LE,
  .rate = SAMPLERATE,
  .channels = 1
};

AudioBackendPulse::AudioBackendPulse(const char *device)
{
  sIn = NULL;
  sOut = NULL;

  memset(read_buffer, 0, sizeof(read_buffer));

  running = true;
  start();
}

AudioBackendPulse::~AudioBackendPulse()
{
  running = false;
  wait();

  // Freeeeedoooooom! Set the PulseAudio instances free again, we're done
  if(sIn) pa_simple_free(sIn);
  if(sOut) pa_simple_free(sOut);
}

void AudioBackendPulse::run()
{
  if(!sIn) {
    sIn = pa_simple_new(NULL, "Anything", PA_STREAM_RECORD, NULL, "record",
                        &ss, NULL, NULL, &error);
    if(!sIn) {
      fprintf(stderr, __FILE__": pa_simple_new() failed: %s\n",
              pa_strerror(error));
      return 0;
    }
  }
  
  char buf[1024];
  while(running) {
    int error;
    pa_simple_read(sIn, buf, sizeof(buf), &error);
    (void)error;
    for(int i = 0; i < sizeof(buf); i++) {
      read_buffer[pwrite % sizeof(read_buffer)] = buf[i];
      pwrite++;
    }    
  }
}

int AudioBackendPulse::read(char *pcm, size_t maxsize)
{
  for(int i = 0; i < maxsize; i++) {
    pcm[i] = read_buffer[pread % sizeof(read_buffer)];
    pread++;
  }    
  return maxsize;
}

int AudioBackendPulse::write(const char *pcm, size_t size)
{
  if(!sOut) {
    sOut = pa_simple_new(NULL, "Anything", PA_STREAM_PLAYBACK, NULL,
                         "playback", &ss, NULL, NULL, &error);
    if(!sOut) {
      fprintf(stderr, __FILE__": pa_simple_new() failed: %s\n",
              pa_strerror(error));
      return 0;
    }
  }

  int error;

  if (pa_simple_write(sOut, pcm, size, &error) < 0) {
    fprintf(stderr, __FILE__": pa_simple_write() failed: %s\n",
            pa_strerror(error));
  }
  /*
  if(pa_simple_drain(sOut, &error) < 0) {
    fprintf(stderr, __FILE__": pa_simple_drain() failed: %s\n",
            pa_strerror(error));
  }
  */

  return 0;
}

#endif/*WITH_PULSE*/