Commit | Line | Data |
---|---|---|
cfa7dda1 | 1 | /* |
2 | * This file is part of DisOrder. | |
3 | * Copyright (C) 2007 Richard Kettlewell | |
313acc77 | 4 | * Portions copyright (C) 2007 Ross Younger |
cfa7dda1 | 5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
19 | * USA | |
20 | */ | |
21 | /** @file clients/playrtp-oss.c | |
a9f0ad12 | 22 | * @brief RTP player - OSS and empeg support |
cfa7dda1 | 23 | */ |
24 | ||
05b75f8d | 25 | #include "common.h" |
cfa7dda1 | 26 | |
a9f0ad12 | 27 | #if HAVE_SYS_SOUNDCARD_H || EMPEG_HOST |
cfa7dda1 | 28 | |
29 | #include <poll.h> | |
30 | #include <sys/ioctl.h> | |
a9f0ad12 | 31 | #if !EMPEG_HOST |
cfa7dda1 | 32 | #include <sys/soundcard.h> |
a9f0ad12 | 33 | #endif |
cfa7dda1 | 34 | #include <pthread.h> |
cfa7dda1 | 35 | #include <fcntl.h> |
36 | #include <unistd.h> | |
37 | #include <errno.h> | |
b28bddbb | 38 | #include <arpa/inet.h> |
cfa7dda1 | 39 | |
40 | #include "mem.h" | |
41 | #include "log.h" | |
42 | #include "vector.h" | |
43 | #include "heap.h" | |
44 | #include "syscalls.h" | |
45 | #include "playrtp.h" | |
46 | ||
47 | /** @brief /dev/dsp (or whatever) */ | |
48 | static int playrtp_oss_fd = -1; | |
49 | ||
515cd2bb | 50 | /** @brief Audio buffer */ |
51 | static char *playrtp_oss_buffer; | |
52 | ||
53 | /** @brief Size of @ref playrtp_oss_buffer in bytes */ | |
54 | static int playrtp_oss_bufsize; | |
55 | ||
56 | /** @brief Number of bytes used in @ref playrtp_oss_buffer */ | |
57 | static int playrtp_oss_bufused; | |
58 | ||
cfa7dda1 | 59 | /** @brief Open and configure the OSS audio device */ |
60 | static void playrtp_oss_enable(void) { | |
61 | if(playrtp_oss_fd == -1) { | |
a9f0ad12 RK |
62 | #if EMPEG_HOST |
63 | /* empeg audio driver only knows /dev/audio, only supports the equivalent | |
64 | * of AFMT_S16_NE, has a fixed buffer size, and does not support the | |
65 | * SNDCTL_ ioctls. */ | |
66 | if(!device) | |
67 | device = "/dev/audio"; | |
68 | if((playrtp_oss_fd = open(device, O_WRONLY)) < 0) | |
69 | fatal(errno, "error opening %s", device); | |
70 | playrtp_oss_bufsize = 4608; | |
71 | #else | |
cfa7dda1 | 72 | int rate = 44100, stereo = 1, format = AFMT_S16_BE; |
73 | if(!device) { | |
74 | if(access("/dev/dsp", W_OK) == 0) | |
75 | device = "/dev/dsp"; | |
76 | else if(access("/dev/audio", W_OK) == 0) | |
77 | device = "/dev/audio"; | |
78 | else | |
79 | fatal(0, "cannot determine default audio device"); | |
80 | } | |
81 | if((playrtp_oss_fd = open(device, O_WRONLY)) < 0) | |
82 | fatal(errno, "error opening %s", device); | |
83 | if(ioctl(playrtp_oss_fd, SNDCTL_DSP_SETFMT, &format) < 0) | |
84 | fatal(errno, "ioctl SNDCTL_DSP_SETFMT"); | |
85 | if(ioctl(playrtp_oss_fd, SNDCTL_DSP_STEREO, &stereo) < 0) | |
86 | fatal(errno, "ioctl SNDCTL_DSP_STEREO"); | |
87 | if(ioctl(playrtp_oss_fd, SNDCTL_DSP_SPEED, &rate) < 0) | |
88 | fatal(errno, "ioctl SNDCTL_DSP_SPEED"); | |
89 | if(rate != 44100) | |
90 | error(0, "asking for 44100Hz, got %dHz", rate); | |
515cd2bb | 91 | if(ioctl(playrtp_oss_fd, SNDCTL_DSP_GETBLKSIZE, &playrtp_oss_bufsize) < 0) |
92 | fatal(errno, "ioctl SNDCTL_DSP_GETBLKSIZE"); | |
a9f0ad12 RK |
93 | info("OSS buffer size %d", playrtp_oss_bufsize); |
94 | #endif | |
515cd2bb | 95 | playrtp_oss_buffer = xmalloc(playrtp_oss_bufsize); |
96 | playrtp_oss_bufused = 0; | |
cfa7dda1 | 97 | nonblock(playrtp_oss_fd); |
98 | } | |
99 | } | |
100 | ||
515cd2bb | 101 | /** @brief Flush the OSS output buffer |
102 | * @return 0 on success, non-0 on error | |
103 | */ | |
104 | static int playrtp_oss_flush(void) { | |
105 | int nbyteswritten; | |
106 | ||
107 | if(!playrtp_oss_bufused) | |
108 | return 0; /* nothing to do */ | |
109 | /* 0 out the unused portion of the buffer */ | |
110 | memset(playrtp_oss_buffer + playrtp_oss_bufused, 0, | |
111 | playrtp_oss_bufsize - playrtp_oss_bufused); | |
a9f0ad12 RK |
112 | #if EMPEG_HOST |
113 | /* empeg audio driver insists on native-endian samples */ | |
114 | { | |
115 | uint16_t *ptr, | |
116 | *const limit = (uint16_t *)(playrtp_oss_buffer + playrtp_oss_bufused); | |
117 | ||
118 | for(ptr = (uint16_t *)playrtp_oss_buffer; ptr < limit; ++ptr) | |
119 | *ptr = ntohs(*ptr); | |
120 | } | |
121 | #endif | |
515cd2bb | 122 | for(;;) { |
123 | nbyteswritten = write(playrtp_oss_fd, | |
124 | playrtp_oss_buffer, playrtp_oss_bufsize); | |
125 | if(nbyteswritten < 0) { | |
126 | switch(errno) { | |
127 | case EINTR: | |
128 | break; /* try again */ | |
129 | case EAGAIN: | |
130 | return 0; /* try later */ | |
131 | default: | |
132 | error(errno, "error writing to %s", device); | |
133 | return -1; | |
134 | } | |
135 | } else { | |
136 | if(nbyteswritten < playrtp_oss_bufsize) | |
137 | error(0, "%s: short write (%d/%d)", | |
138 | device, nbyteswritten, playrtp_oss_bufsize); | |
b28bddbb RK |
139 | if(dump_buffer) { |
140 | int count; | |
141 | const int16_t *sp = (const int16_t *)playrtp_oss_buffer; | |
142 | ||
143 | for(count = 0; count < playrtp_oss_bufsize; count += sizeof(int16_t)) { | |
144 | dump_buffer[dump_index++] = (int16_t)ntohs(*sp++); | |
145 | dump_index %= dump_size; | |
146 | } | |
147 | } | |
515cd2bb | 148 | playrtp_oss_bufused = 0; |
149 | return 0; | |
150 | } | |
151 | } | |
152 | } | |
153 | ||
cfa7dda1 | 154 | /** @brief Wait until the audio device can accept more data */ |
155 | static void playrtp_oss_wait(void) { | |
156 | struct pollfd fds[1]; | |
157 | int n; | |
158 | ||
159 | do { | |
160 | fds[0].fd = playrtp_oss_fd; | |
161 | fds[0].events = POLLOUT; | |
162 | while((n = poll(fds, 1, -1)) < 0 && errno == EINTR) | |
163 | ; | |
164 | if(n < 0) | |
165 | fatal(errno, "calling poll"); | |
166 | } while(!(fds[0].revents & (POLLOUT|POLLERR))); | |
167 | } | |
168 | ||
169 | /** @brief Close the OSS output device | |
170 | * @param hard If nonzero, drop pending data | |
171 | */ | |
172 | static void playrtp_oss_disable(int hard) { | |
515cd2bb | 173 | if(hard) { |
a9f0ad12 RK |
174 | #if !EMPEG_HOST |
175 | /* No SNDCTL_DSP_ ioctls on empeg */ | |
cfa7dda1 | 176 | if(ioctl(playrtp_oss_fd, SNDCTL_DSP_RESET, 0) < 0) |
177 | error(errno, "ioctl SNDCTL_DSP_RESET"); | |
a9f0ad12 | 178 | #endif |
515cd2bb | 179 | } else |
180 | playrtp_oss_flush(); | |
cfa7dda1 | 181 | xclose(playrtp_oss_fd); |
182 | playrtp_oss_fd = -1; | |
515cd2bb | 183 | free(playrtp_oss_buffer); |
184 | playrtp_oss_buffer = 0; | |
cfa7dda1 | 185 | } |
186 | ||
187 | /** @brief Write samples to OSS output device | |
188 | * @param data Pointer to sample data | |
158d0961 | 189 | * @param samples Number of samples |
cfa7dda1 | 190 | * @return 0 on success, non-0 on error |
191 | */ | |
515cd2bb | 192 | static int playrtp_oss_write(const char *data, size_t samples) { |
193 | long bytes = samples * sizeof(int16_t); | |
194 | while(bytes > 0) { | |
195 | int n = playrtp_oss_bufsize - playrtp_oss_bufused; | |
196 | ||
197 | if(n > bytes) | |
198 | n = bytes; | |
199 | memcpy(playrtp_oss_buffer + playrtp_oss_bufused, data, n); | |
200 | bytes -= n; | |
201 | data += n; | |
202 | playrtp_oss_bufused += n; | |
203 | if(playrtp_oss_bufused == playrtp_oss_bufsize) | |
204 | if(playrtp_oss_flush()) | |
205 | return -1; | |
cfa7dda1 | 206 | } |
515cd2bb | 207 | next_timestamp += samples; |
208 | return 0; | |
cfa7dda1 | 209 | } |
210 | ||
211 | /** @brief Play some data from packet @p p | |
212 | * | |
213 | * @p p is assumed to contain @ref next_timestamp. | |
214 | */ | |
215 | static int playrtp_oss_play(const struct packet *p) { | |
515cd2bb | 216 | return playrtp_oss_write |
217 | ((const char *)(p->samples_raw + next_timestamp - p->timestamp), | |
218 | (p->timestamp + p->nsamples) - next_timestamp); | |
cfa7dda1 | 219 | } |
220 | ||
221 | /** @brief Play some silence before packet @p p | |
222 | * | |
223 | * @p p is assumed to be entirely before @ref next_timestamp. | |
224 | */ | |
225 | static int playrtp_oss_infill(const struct packet *p) { | |
515cd2bb | 226 | static const char zeros[INFILL_SAMPLES * sizeof(int16_t)]; |
cfa7dda1 | 227 | size_t samples_available = INFILL_SAMPLES; |
228 | ||
229 | if(p && samples_available > p->timestamp - next_timestamp) | |
230 | samples_available = p->timestamp - next_timestamp; | |
231 | return playrtp_oss_write(zeros, samples_available); | |
232 | } | |
233 | ||
234 | /** @brief OSS backend for playrtp */ | |
235 | void playrtp_oss(void) { | |
236 | int escape; | |
237 | const struct packet *p; | |
238 | ||
239 | pthread_mutex_lock(&lock); | |
240 | for(;;) { | |
241 | /* Wait for the buffer to fill up a bit */ | |
242 | playrtp_fill_buffer(); | |
243 | playrtp_oss_enable(); | |
244 | escape = 0; | |
245 | info("Playing..."); | |
246 | /* Keep playing until the buffer empties out, we get an error */ | |
247 | while((nsamples >= minbuffer | |
248 | || (nsamples > 0 | |
249 | && contains(pheap_first(&packets), next_timestamp))) | |
250 | && !escape) { | |
251 | /* Wait until we can play more */ | |
252 | pthread_mutex_unlock(&lock); | |
253 | playrtp_oss_wait(); | |
254 | pthread_mutex_lock(&lock); | |
255 | /* Device is ready for more data, find something to play */ | |
256 | p = playrtp_next_packet(); | |
257 | /* Play it or play some silence */ | |
258 | if(contains(p, next_timestamp)) | |
259 | escape = playrtp_oss_play(p); | |
260 | else | |
261 | escape = playrtp_oss_infill(p); | |
262 | } | |
263 | active = 0; | |
264 | /* We stop playing for a bit until the buffer re-fills */ | |
265 | pthread_mutex_unlock(&lock); | |
266 | playrtp_oss_disable(escape); | |
267 | pthread_mutex_lock(&lock); | |
268 | } | |
269 | } | |
270 | ||
271 | #endif | |
272 | ||
273 | /* | |
274 | Local Variables: | |
275 | c-basic-offset:2 | |
276 | comment-column:40 | |
277 | fill-column:79 | |
278 | indent-tabs-mode:nil | |
279 | End: | |
280 | */ |