aboutsummaryrefslogtreecommitdiff
path: root/plugins/dfsound/oss.c
blob: 04d74463536544b6b4063e03796c14993169e897 (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
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
/***************************************************************************
                            oss.c  -  description
                             -------------------
    begin                : Wed May 15 2002
    copyright            : (C) 2002 by Pete Bernert
    email                : BlackDove@addcom.de
 ***************************************************************************/
/***************************************************************************
 *                                                                         *
 *   This program 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. See also the license.txt file for *
 *   additional informations.                                              *
 *                                                                         *
 ***************************************************************************/

#include "stdafx.h"

#define _IN_OSS

#include "externals.h"

////////////////////////////////////////////////////////////////////////
// oss globals
////////////////////////////////////////////////////////////////////////

#define OSS_MODE_STEREO	    1
#define OSS_MODE_MONO       0

#define OSS_SPEED_44100     44100

static int oss_audio_fd = -1;
extern int errno;

////////////////////////////////////////////////////////////////////////
// SETUP SOUND
////////////////////////////////////////////////////////////////////////

void SetupSound(void)
{
 int pspeed=44100;
 int pstereo;
 int format;
 int fragsize = 0;
 int myfrag;
 int oss_speed, oss_stereo;

 pstereo = OSS_MODE_STEREO;
 oss_speed = pspeed;
 oss_stereo = pstereo;

 if((oss_audio_fd=open("/dev/dsp",O_WRONLY,0))==-1)
  {
   printf("Sound device not available!\n");
   return;
  }

 if(ioctl(oss_audio_fd,SNDCTL_DSP_RESET,0)==-1)
  {
   printf("Sound reset failed\n");
   return;
  }

 // we use 64 fragments with 1024 bytes each
 // rearmed: now using 10*4096 for better latency

 fragsize=12;
 myfrag=(10<<16)|fragsize;

 if(ioctl(oss_audio_fd,SNDCTL_DSP_SETFRAGMENT,&myfrag)==-1)
  {
   printf("Sound set fragment failed!\n");
   return;        
  }

 format = AFMT_S16_NE;

 if(ioctl(oss_audio_fd,SNDCTL_DSP_SETFMT,&format) == -1)
  {
   printf("Sound format not supported!\n");
   return;
  }

 if(format!=AFMT_S16_NE)
  {
   printf("Sound format not supported!\n");
   return;
  }

 if(ioctl(oss_audio_fd,SNDCTL_DSP_STEREO,&oss_stereo)==-1 || !oss_stereo)
  {
   printf("Stereo mode not supported!\n");
   return;
  }

 if(ioctl(oss_audio_fd,SNDCTL_DSP_SPEED,&oss_speed)==-1)
  {
   printf("Sound frequency not supported\n");
   return;
  }

 if(oss_speed!=pspeed)
  {
   printf("Sound frequency not supported\n");
   return;
  }
}

////////////////////////////////////////////////////////////////////////
// REMOVE SOUND
////////////////////////////////////////////////////////////////////////

void RemoveSound(void)
{
 if(oss_audio_fd != -1 )
  {
   close(oss_audio_fd);
   oss_audio_fd = -1;
  }
}

////////////////////////////////////////////////////////////////////////
// GET BYTES BUFFERED
////////////////////////////////////////////////////////////////////////

unsigned long SoundGetBytesBuffered(void)
{
 audio_buf_info info;
 unsigned long l;

 if(oss_audio_fd == -1) return 1;
 if(ioctl(oss_audio_fd,SNDCTL_DSP_GETOSPACE,&info)==-1)
  l=0;
 else
  {
   if(info.fragments<(info.fragstotal>>1))             // can we write in at least the half of fragments?
        l=1;                                           // -> no? wait
   else l=0;                                           // -> else go on
  }

 return l;
}

////////////////////////////////////////////////////////////////////////
// FEED SOUND DATA
////////////////////////////////////////////////////////////////////////

void SoundFeedStreamData(unsigned char* pSound,long lBytes)
{
 if(oss_audio_fd == -1) return;
 write(oss_audio_fd,pSound,lBytes);
}