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
|
--- ./sound.cpp.orig 2010-03-28 11:47:06.000000000 +0200
+++ ./sound.cpp 2010-03-28 11:50:10.000000000 +0200
@@ -6,7 +6,6 @@
Project Page: http://atariarea.krap.pl/stymulator
Original ST-Sound GPL library by Arnaud Carre (http://leonard.oxg.free.fr)
- ALSA (Advanced Linux Sound Architecture) library (http://www.alsa-project.org/)
-----------------------------------------------------------------------------
* STYMulator is free software; you can redistribute it and/or modify *
@@ -25,73 +24,38 @@
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
---------------------------------------------------------------------------*/
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
#include "sound.h"
-snd_pcm_format_t format = SND_PCM_FORMAT_S16;
+int format = AFMT_S16_LE;
int err, dir;
int resample = 1;
unsigned int rate = 44100;
unsigned int channels = 1;
-unsigned int buffer_time = 500000;
unsigned int period_time = 100000;
-snd_pcm_uframes_t buffer_size; //22050
-snd_pcm_uframes_t period_size; //4410
+int period_size; //4410
-int alsa_init(snd_pcm_t *pcm_handle, snd_pcm_hw_params_t *hwparams)
-{
- if ((err = snd_pcm_hw_params_any(pcm_handle, hwparams)) < 0) {
- printf("Broken configuration for playback: no configurations available: %s\n", snd_strerror(err));
- return err;
- }
-/* removed snd_pcm_hw_params_set_rate_resample function that has been added to alsa-lib since 1.0.9rc2 (more portability)
-
- if ((err = snd_pcm_hw_params_set_rate_resample(pcm_handle, hwparams, resample)) < 0) {
- printf("Resampling setup failed for playback: %s\n", snd_strerror(err));
- return err;
- }
-*/
- if ((err = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) {
- printf("Access type not available for playback: %s\n", snd_strerror(err));
- return err;
- }
- if ((err = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format)) < 0) {
- printf("Sample format not available for playback: %s\n", snd_strerror(err));
- return err;
- }
- if ((err = snd_pcm_hw_params_set_channels(pcm_handle, hwparams, channels)) < 0) {
- printf("Channels count (%i) not available for playbacks: %s\n", channels, snd_strerror(err));
- return err;
- }
- unsigned int rrate = rate;
- if ((err = snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &rrate, 0)) < 0) {
- printf("Rate %iHz not available for playback: %s\n", rate, snd_strerror(err));
- return err;
- }
- if (rrate != rate) {
- printf("Rate doesn't match (requested %iHz, get %iHz)\n", rate, err);
- return -EINVAL;
- }
- if ((err = snd_pcm_hw_params_set_buffer_time_near(pcm_handle, hwparams, &buffer_time, &dir)) < 0) {
- printf("Unable to set buffer time %i for playback: %s\n", buffer_time, snd_strerror(err));
- return err;
- }
- if ((err = snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size)) < 0) {
- printf("Unable to get buffer size for playback: %s\n", snd_strerror(err));
- return err;
- }
- if ((err = snd_pcm_hw_params_set_period_time_near(pcm_handle, hwparams, &period_time, &dir)) < 0) {
- printf("Unable to set period time %i for playback: %s\n", period_time, snd_strerror(err));
- return err;
- }
- if ((err = snd_pcm_hw_params_get_period_size(hwparams, &period_size, &dir)) < 0) {
- printf("Unable to get period size for playback: %s\n", snd_strerror(err));
- return err;
- }
- if ((err = snd_pcm_hw_params(pcm_handle, hwparams)) < 0) {
- printf("Unable to set hw params for playback: %s\n", snd_strerror(err));
- return err;
- }
- return 0;
+int oss_init(int audio_fd) {
+ period_size = 4096;
+
+ if (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &format) < 0) {
+ printf("Cannot set sample format\n");
+ return -1;
+ }
+
+ if (ioctl(audio_fd, SNDCTL_DSP_CHANNELS, &channels) < 0) {
+ printf("Cannot set audio channels\n");
+ return -1;
+ }
+
+ if (ioctl(audio_fd, SNDCTL_DSP_SPEED, &rate) < 0) {
+ printf("Cannot set sample rate\n");
+ return -1;
+ }
+
+ return 0;
}
|
