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