cfa7dda1 |
1 | /* |
2 | * This file is part of DisOrder. |
3 | * Copyright (C) 2007 Richard Kettlewell |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License as published by |
7 | * the Free Software Foundation; either version 2 of the License, or |
8 | * (at your option) any later version. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, but |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | * General Public License for more details. |
14 | * |
15 | * You should have received a copy of the GNU General Public License |
16 | * along with this program; if not, write to the Free Software |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
18 | * USA |
19 | */ |
20 | /** @file clients/playrtp-oss.c |
21 | * @brief RTP player - OSS support |
22 | */ |
23 | |
24 | #include <config.h> |
25 | |
26 | #if HAVE_SYS_SOUNDCARD_H |
27 | #include "types.h" |
28 | |
29 | #include <poll.h> |
30 | #include <sys/ioctl.h> |
31 | #include <sys/soundcard.h> |
32 | #include <assert.h> |
33 | #include <pthread.h> |
34 | #include <string.h> |
35 | #include <fcntl.h> |
36 | #include <unistd.h> |
37 | #include <errno.h> |
515cd2bb |
38 | #if HAVE_LINUX_EMPEG_H |
39 | # include <linux/empeg.h> |
40 | #endif |
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41 | |
42 | #include "mem.h" |
43 | #include "log.h" |
44 | #include "vector.h" |
45 | #include "heap.h" |
46 | #include "syscalls.h" |
47 | #include "playrtp.h" |
48 | |
49 | /** @brief /dev/dsp (or whatever) */ |
50 | static int playrtp_oss_fd = -1; |
51 | |
515cd2bb |
52 | /** @brief Audio buffer */ |
53 | static char *playrtp_oss_buffer; |
54 | |
55 | /** @brief Size of @ref playrtp_oss_buffer in bytes */ |
56 | static int playrtp_oss_bufsize; |
57 | |
58 | /** @brief Number of bytes used in @ref playrtp_oss_buffer */ |
59 | static int playrtp_oss_bufused; |
60 | |
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61 | /** @brief Open and configure the OSS audio device */ |
62 | static void playrtp_oss_enable(void) { |
63 | if(playrtp_oss_fd == -1) { |
64 | int rate = 44100, stereo = 1, format = AFMT_S16_BE; |
65 | if(!device) { |
66 | if(access("/dev/dsp", W_OK) == 0) |
67 | device = "/dev/dsp"; |
68 | else if(access("/dev/audio", W_OK) == 0) |
69 | device = "/dev/audio"; |
70 | else |
71 | fatal(0, "cannot determine default audio device"); |
72 | } |
73 | if((playrtp_oss_fd = open(device, O_WRONLY)) < 0) |
74 | fatal(errno, "error opening %s", device); |
75 | if(ioctl(playrtp_oss_fd, SNDCTL_DSP_SETFMT, &format) < 0) |
76 | fatal(errno, "ioctl SNDCTL_DSP_SETFMT"); |
77 | if(ioctl(playrtp_oss_fd, SNDCTL_DSP_STEREO, &stereo) < 0) |
78 | fatal(errno, "ioctl SNDCTL_DSP_STEREO"); |
79 | if(ioctl(playrtp_oss_fd, SNDCTL_DSP_SPEED, &rate) < 0) |
80 | fatal(errno, "ioctl SNDCTL_DSP_SPEED"); |
81 | if(rate != 44100) |
82 | error(0, "asking for 44100Hz, got %dHz", rate); |
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83 | if(ioctl(playrtp_oss_fd, SNDCTL_DSP_GETBLKSIZE, &playrtp_oss_bufsize) < 0) |
84 | fatal(errno, "ioctl SNDCTL_DSP_GETBLKSIZE"); |
85 | playrtp_oss_buffer = xmalloc(playrtp_oss_bufsize); |
86 | playrtp_oss_bufused = 0; |
87 | info("OSS buffer size %d", playrtp_oss_bufsize); |
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88 | nonblock(playrtp_oss_fd); |
89 | } |
90 | } |
91 | |
515cd2bb |
92 | /** @brief Flush the OSS output buffer |
93 | * @return 0 on success, non-0 on error |
94 | */ |
95 | static int playrtp_oss_flush(void) { |
96 | int nbyteswritten; |
97 | |
98 | if(!playrtp_oss_bufused) |
99 | return 0; /* nothing to do */ |
100 | /* 0 out the unused portion of the buffer */ |
101 | memset(playrtp_oss_buffer + playrtp_oss_bufused, 0, |
102 | playrtp_oss_bufsize - playrtp_oss_bufused); |
103 | for(;;) { |
104 | nbyteswritten = write(playrtp_oss_fd, |
105 | playrtp_oss_buffer, playrtp_oss_bufsize); |
106 | if(nbyteswritten < 0) { |
107 | switch(errno) { |
108 | case EINTR: |
109 | break; /* try again */ |
110 | case EAGAIN: |
111 | return 0; /* try later */ |
112 | default: |
113 | error(errno, "error writing to %s", device); |
114 | return -1; |
115 | } |
116 | } else { |
117 | if(nbyteswritten < playrtp_oss_bufsize) |
118 | error(0, "%s: short write (%d/%d)", |
119 | device, nbyteswritten, playrtp_oss_bufsize); |
120 | playrtp_oss_bufused = 0; |
121 | return 0; |
122 | } |
123 | } |
124 | } |
125 | |
cfa7dda1 |
126 | /** @brief Wait until the audio device can accept more data */ |
127 | static void playrtp_oss_wait(void) { |
128 | struct pollfd fds[1]; |
129 | int n; |
130 | |
131 | do { |
132 | fds[0].fd = playrtp_oss_fd; |
133 | fds[0].events = POLLOUT; |
134 | while((n = poll(fds, 1, -1)) < 0 && errno == EINTR) |
135 | ; |
136 | if(n < 0) |
137 | fatal(errno, "calling poll"); |
138 | } while(!(fds[0].revents & (POLLOUT|POLLERR))); |
139 | } |
140 | |
141 | /** @brief Close the OSS output device |
142 | * @param hard If nonzero, drop pending data |
143 | */ |
144 | static void playrtp_oss_disable(int hard) { |
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145 | if(hard) { |
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146 | if(ioctl(playrtp_oss_fd, SNDCTL_DSP_RESET, 0) < 0) |
147 | error(errno, "ioctl SNDCTL_DSP_RESET"); |
515cd2bb |
148 | } else |
149 | playrtp_oss_flush(); |
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150 | xclose(playrtp_oss_fd); |
151 | playrtp_oss_fd = -1; |
515cd2bb |
152 | free(playrtp_oss_buffer); |
153 | playrtp_oss_buffer = 0; |
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154 | } |
155 | |
156 | /** @brief Write samples to OSS output device |
157 | * @param data Pointer to sample data |
158 | * @param nsamples Number of samples |
159 | * @return 0 on success, non-0 on error |
160 | */ |
515cd2bb |
161 | static int playrtp_oss_write(const char *data, size_t samples) { |
162 | long bytes = samples * sizeof(int16_t); |
163 | while(bytes > 0) { |
164 | int n = playrtp_oss_bufsize - playrtp_oss_bufused; |
165 | |
166 | if(n > bytes) |
167 | n = bytes; |
168 | memcpy(playrtp_oss_buffer + playrtp_oss_bufused, data, n); |
169 | bytes -= n; |
170 | data += n; |
171 | playrtp_oss_bufused += n; |
172 | if(playrtp_oss_bufused == playrtp_oss_bufsize) |
173 | if(playrtp_oss_flush()) |
174 | return -1; |
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175 | } |
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176 | next_timestamp += samples; |
177 | return 0; |
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178 | } |
179 | |
180 | /** @brief Play some data from packet @p p |
181 | * |
182 | * @p p is assumed to contain @ref next_timestamp. |
183 | */ |
184 | static int playrtp_oss_play(const struct packet *p) { |
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185 | return playrtp_oss_write |
186 | ((const char *)(p->samples_raw + next_timestamp - p->timestamp), |
187 | (p->timestamp + p->nsamples) - next_timestamp); |
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188 | } |
189 | |
190 | /** @brief Play some silence before packet @p p |
191 | * |
192 | * @p p is assumed to be entirely before @ref next_timestamp. |
193 | */ |
194 | static int playrtp_oss_infill(const struct packet *p) { |
515cd2bb |
195 | static const char zeros[INFILL_SAMPLES * sizeof(int16_t)]; |
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196 | size_t samples_available = INFILL_SAMPLES; |
197 | |
198 | if(p && samples_available > p->timestamp - next_timestamp) |
199 | samples_available = p->timestamp - next_timestamp; |
200 | return playrtp_oss_write(zeros, samples_available); |
201 | } |
202 | |
203 | /** @brief OSS backend for playrtp */ |
204 | void playrtp_oss(void) { |
205 | int escape; |
206 | const struct packet *p; |
207 | |
208 | pthread_mutex_lock(&lock); |
209 | for(;;) { |
210 | /* Wait for the buffer to fill up a bit */ |
211 | playrtp_fill_buffer(); |
212 | playrtp_oss_enable(); |
213 | escape = 0; |
214 | info("Playing..."); |
215 | /* Keep playing until the buffer empties out, we get an error */ |
216 | while((nsamples >= minbuffer |
217 | || (nsamples > 0 |
218 | && contains(pheap_first(&packets), next_timestamp))) |
219 | && !escape) { |
220 | /* Wait until we can play more */ |
221 | pthread_mutex_unlock(&lock); |
222 | playrtp_oss_wait(); |
223 | pthread_mutex_lock(&lock); |
224 | /* Device is ready for more data, find something to play */ |
225 | p = playrtp_next_packet(); |
226 | /* Play it or play some silence */ |
227 | if(contains(p, next_timestamp)) |
228 | escape = playrtp_oss_play(p); |
229 | else |
230 | escape = playrtp_oss_infill(p); |
231 | } |
232 | active = 0; |
233 | /* We stop playing for a bit until the buffer re-fills */ |
234 | pthread_mutex_unlock(&lock); |
235 | playrtp_oss_disable(escape); |
236 | pthread_mutex_lock(&lock); |
237 | } |
238 | } |
239 | |
240 | #endif |
241 | |
242 | /* |
243 | Local Variables: |
244 | c-basic-offset:2 |
245 | comment-column:40 |
246 | fill-column:79 |
247 | indent-tabs-mode:nil |
248 | End: |
249 | */ |