f89d8471 |
1 | /* |
2 | * (C) GraÅžvydas "notaz" Ignotas, 2009-2010 |
3 | * |
4 | * This work is licensed under the terms of any of these licenses |
5 | * (at your option): |
6 | * - GNU GPL, version 2 or later. |
7 | * - GNU LGPL, version 2.1 or later. |
8 | * - MAME license. |
9 | * See the COPYING file in the top-level directory. |
10 | */ |
11 | |
b3972d82 |
12 | /* sound output via OSS */ |
13 | #include <stdio.h> |
14 | #include <sys/types.h> |
15 | #include <sys/stat.h> |
16 | #include <fcntl.h> |
17 | #include <sys/ioctl.h> |
18 | #include <sys/soundcard.h> |
19 | #include <unistd.h> |
20 | |
21 | #include "sndout_oss.h" |
22 | |
23 | static int sounddev = -1, mixerdev = -1; |
dd59a74b |
24 | static int can_write_safe; |
25 | |
f679add7 |
26 | #define FRAG_COUNT 4 |
b3972d82 |
27 | |
28 | int sndout_oss_init(void) |
29 | { |
30 | if (mixerdev >= 0) close(mixerdev); |
31 | mixerdev = open("/dev/mixer", O_RDWR); |
32 | if (mixerdev == -1) |
33 | { |
34 | perror("open(\"/dev/mixer\")"); |
35 | } |
36 | |
37 | return 0; |
38 | } |
39 | |
b188c2b6 |
40 | void sndout_oss_stop(void) |
41 | { |
42 | if (sounddev < 0) |
43 | return; |
44 | |
45 | ioctl(sounddev, SOUND_PCM_SYNC, 0); |
46 | close(sounddev); |
47 | sounddev = -1; |
48 | } |
49 | |
f679add7 |
50 | int sndout_oss_start(int rate, int stereo, int frames_in_frag) |
b3972d82 |
51 | { |
f679add7 |
52 | static int s_oldrate = 0, s_oldstereo = 0; |
dd59a74b |
53 | int frag, bsize, bits, ret; |
b3972d82 |
54 | |
b188c2b6 |
55 | // GP2X: if no settings change, we don't need to do anything, |
56 | // since audio is never stopped there |
f679add7 |
57 | if (sounddev >= 0 && rate == s_oldrate && s_oldstereo == stereo) |
b3972d82 |
58 | return 0; |
59 | |
b188c2b6 |
60 | sndout_oss_stop(); |
d747e9d6 |
61 | sounddev = open("/dev/dsp", O_WRONLY); |
b3972d82 |
62 | if (sounddev == -1) |
63 | { |
64 | perror("open(\"/dev/dsp\")"); |
d747e9d6 |
65 | sounddev = open("/dev/dsp1", O_WRONLY); |
5f7b5155 |
66 | if (sounddev == -1) { |
67 | perror("open(\"/dev/dsp1\")"); |
68 | return -1; |
69 | } |
b3972d82 |
70 | } |
71 | |
f679add7 |
72 | // try to fit frames_in_frag frames worth of data in fragment |
73 | // ignore mono because it's unlikely to be used and |
74 | // both GP2X and Wiz mixes mono to stereo anyway. |
75 | bsize = (frames_in_frag * rate / 50) * 4; |
dd59a74b |
76 | |
77 | for (frag = 0; bsize; bsize >>= 1, frag++) |
78 | ; |
b3972d82 |
79 | |
f679add7 |
80 | frag |= FRAG_COUNT << 16; // fragment count |
dd59a74b |
81 | ret = ioctl(sounddev, SNDCTL_DSP_SETFRAGMENT, &frag); |
82 | if (ret < 0) |
83 | perror("SNDCTL_DSP_SETFRAGMENT failed"); |
84 | |
85 | bits = 16; |
86 | ret = ioctl(sounddev, SNDCTL_DSP_STEREO, &stereo); |
87 | if (ret == 0) |
88 | ret = ioctl(sounddev, SNDCTL_DSP_SETFMT, &bits); |
89 | if (ret == 0) |
90 | ret = ioctl(sounddev, SNDCTL_DSP_SPEED, &rate); |
91 | if (ret < 0) |
92 | perror("failed to set audio format"); |
93 | |
b188c2b6 |
94 | #ifdef __GP2X__ |
dd59a74b |
95 | // not sure if this is still needed (avoiding driver bugs?) |
b3972d82 |
96 | usleep(192*1024); |
b188c2b6 |
97 | #endif |
b3972d82 |
98 | |
dd59a74b |
99 | printf("sndout_oss_start: %d/%dbit/%s, %d buffers of %i bytes\n", |
100 | rate, bits, stereo ? "stereo" : "mono", frag >> 16, 1 << (frag & 0xffff)); |
b3972d82 |
101 | |
f679add7 |
102 | s_oldrate = rate; s_oldstereo = stereo; |
dd59a74b |
103 | can_write_safe = 0; |
b3972d82 |
104 | return 0; |
105 | } |
106 | |
b3972d82 |
107 | int sndout_oss_write(const void *buff, int len) |
108 | { |
109 | return write(sounddev, buff, len); |
110 | } |
111 | |
a86e9a3e |
112 | #include "../plat.h" |
a33164ff |
113 | |
114 | /* not really non-blocking, just detects if blocking occurs |
115 | * and starts skipping writes in case it does. */ |
116 | int sndout_oss_write_nb(const void *buff, int len) |
117 | { |
118 | static int lag_counter, skip_counter; |
119 | unsigned int t; |
120 | int ret; |
121 | |
122 | if (lag_counter > 2) { |
123 | // skip writes if audio starts blocking |
124 | lag_counter = 0; |
125 | skip_counter = FRAG_COUNT; |
126 | } |
127 | |
128 | if (skip_counter > 0) { |
129 | skip_counter--; |
130 | return len; |
131 | } |
132 | |
133 | t = plat_get_ticks_ms(); |
134 | ret = sndout_oss_write(buff, len); |
135 | t = plat_get_ticks_ms() - t; |
136 | if (t > 1) { |
137 | // this shouldn't really happen, most likely audio is out of sync |
138 | lag_counter++; |
139 | if (lag_counter > 2) |
140 | printf("audio lag %u\n", t); |
141 | } |
142 | else |
143 | lag_counter = 0; |
144 | |
145 | return ret; |
146 | } |
147 | |
dd59a74b |
148 | int sndout_oss_can_write(int bytes) |
149 | { |
150 | audio_buf_info bi; |
151 | int ret; |
152 | |
153 | #ifdef __GP2X__ |
154 | // note: SNDCTL_DSP_GETOSPACE crashes F100 kernel for some reason |
155 | // if called too early, so we work around here |
156 | if (can_write_safe++ < 8) |
157 | return 1; |
158 | #endif |
159 | ret = ioctl(sounddev, SNDCTL_DSP_GETOSPACE, &bi); |
160 | if (ret < 0) |
161 | return 1; |
162 | |
f679add7 |
163 | // have enough bytes to write + 1 frag |
164 | return bi.bytes - bi.fragsize >= bytes ? 1 : 0; |
dd59a74b |
165 | } |
b3972d82 |
166 | |
167 | void sndout_oss_sync(void) |
168 | { |
169 | ioctl(sounddev, SOUND_PCM_SYNC, 0); |
170 | } |
171 | |
b3972d82 |
172 | void sndout_oss_setvol(int l, int r) |
173 | { |
174 | if (mixerdev < 0) return; |
175 | |
176 | l=l<0?0:l; l=l>255?255:l; r=r<0?0:r; r=r>255?255:r; |
177 | l<<=8; l|=r; |
178 | ioctl(mixerdev, SOUND_MIXER_WRITE_PCM, &l); /*SOUND_MIXER_WRITE_VOLUME*/ |
179 | } |
180 | |
b3972d82 |
181 | void sndout_oss_exit(void) |
182 | { |
183 | if (sounddev >= 0) close(sounddev); sounddev = -1; |
184 | if (mixerdev >= 0) close(mixerdev); mixerdev = -1; |
185 | } |
186 | |