frontend: split 4:3 scaling options
[pcsx_rearmed.git] / plugins / dfsound / oss.c
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1/***************************************************************************
2 oss.c - description
3 -------------------
4 begin : Wed May 15 2002
5 copyright : (C) 2002 by Pete Bernert
6 email : BlackDove@addcom.de
7 ***************************************************************************/
8/***************************************************************************
9 * *
10 * This program is free software; you can redistribute it and/or modify *
11 * it under the terms of the GNU General Public License as published by *
12 * the Free Software Foundation; either version 2 of the License, or *
13 * (at your option) any later version. See also the license.txt file for *
14 * additional informations. *
15 * *
16 ***************************************************************************/
17
18#include "stdafx.h"
19
20#define _IN_OSS
21
22#include "externals.h"
23
24////////////////////////////////////////////////////////////////////////
25// oss globals
26////////////////////////////////////////////////////////////////////////
27
28#define OSS_MODE_STEREO 1
29#define OSS_MODE_MONO 0
30
31#define OSS_SPEED_44100 44100
32
33static int oss_audio_fd = -1;
34extern int errno;
35
36////////////////////////////////////////////////////////////////////////
37// SETUP SOUND
38////////////////////////////////////////////////////////////////////////
39
40void SetupSound(void)
41{
42 int pspeed=44100;
43 int pstereo;
44 int format;
45 int fragsize = 0;
46 int myfrag;
47 int oss_speed, oss_stereo;
48
97ea4077 49 pstereo = OSS_MODE_STEREO;
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50 oss_speed = pspeed;
51 oss_stereo = pstereo;
52
53 if((oss_audio_fd=open("/dev/dsp",O_WRONLY,0))==-1)
54 {
55 printf("Sound device not available!\n");
56 return;
57 }
58
59 if(ioctl(oss_audio_fd,SNDCTL_DSP_RESET,0)==-1)
60 {
61 printf("Sound reset failed\n");
62 return;
63 }
64
65 // we use 64 fragments with 1024 bytes each
17ed0d69 66 // rearmed: now using 10*4096 for better latency
ef79bbde 67
17ed0d69 68 fragsize=12;
69 myfrag=(10<<16)|fragsize;
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70
71 if(ioctl(oss_audio_fd,SNDCTL_DSP_SETFRAGMENT,&myfrag)==-1)
72 {
73 printf("Sound set fragment failed!\n");
74 return;
75 }
76
77 format = AFMT_S16_NE;
78
79 if(ioctl(oss_audio_fd,SNDCTL_DSP_SETFMT,&format) == -1)
80 {
81 printf("Sound format not supported!\n");
82 return;
83 }
84
85 if(format!=AFMT_S16_NE)
86 {
87 printf("Sound format not supported!\n");
88 return;
89 }
90
97ea4077 91 if(ioctl(oss_audio_fd,SNDCTL_DSP_STEREO,&oss_stereo)==-1 || !oss_stereo)
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92 {
93 printf("Stereo mode not supported!\n");
94 return;
95 }
96
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97 if(ioctl(oss_audio_fd,SNDCTL_DSP_SPEED,&oss_speed)==-1)
98 {
99 printf("Sound frequency not supported\n");
100 return;
101 }
102
103 if(oss_speed!=pspeed)
104 {
105 printf("Sound frequency not supported\n");
106 return;
107 }
108}
109
110////////////////////////////////////////////////////////////////////////
111// REMOVE SOUND
112////////////////////////////////////////////////////////////////////////
113
114void RemoveSound(void)
115{
116 if(oss_audio_fd != -1 )
117 {
118 close(oss_audio_fd);
119 oss_audio_fd = -1;
120 }
121}
122
123////////////////////////////////////////////////////////////////////////
124// GET BYTES BUFFERED
125////////////////////////////////////////////////////////////////////////
126
127unsigned long SoundGetBytesBuffered(void)
128{
129 audio_buf_info info;
130 unsigned long l;
131
132 if(oss_audio_fd == -1) return SOUNDSIZE;
133 if(ioctl(oss_audio_fd,SNDCTL_DSP_GETOSPACE,&info)==-1)
134 l=0;
135 else
136 {
137 if(info.fragments<(info.fragstotal>>1)) // can we write in at least the half of fragments?
138 l=SOUNDSIZE; // -> no? wait
139 else l=0; // -> else go on
140 }
141
142 return l;
143}
144
145////////////////////////////////////////////////////////////////////////
146// FEED SOUND DATA
147////////////////////////////////////////////////////////////////////////
148
149void SoundFeedStreamData(unsigned char* pSound,long lBytes)
150{
151 if(oss_audio_fd == -1) return;
152 write(oss_audio_fd,pSound,lBytes);
153}