2 * This file is part of DisOrder.
3 * Copyright (C) 2007 Richard Kettlewell
4 * Portions copyright (C) 2007 Ross Younger
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 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 /** @file clients/playrtp-oss.c
20 * @brief RTP player - OSS and empeg support
25 #if HAVE_SYS_SOUNDCARD_H || EMPEG_HOST
28 #include <sys/ioctl.h>
30 #include <sys/soundcard.h>
36 #include <arpa/inet.h>
45 /** @brief /dev/dsp (or whatever) */
46 static int playrtp_oss_fd
= -1;
48 /** @brief Audio buffer */
49 static char *playrtp_oss_buffer
;
51 /** @brief Size of @ref playrtp_oss_buffer in bytes */
52 static int playrtp_oss_bufsize
;
54 /** @brief Number of bytes used in @ref playrtp_oss_buffer */
55 static int playrtp_oss_bufused
;
57 /** @brief Open and configure the OSS audio device */
58 static void playrtp_oss_enable(void) {
59 if(playrtp_oss_fd
== -1) {
61 /* empeg audio driver only knows /dev/audio, only supports the equivalent
62 * of AFMT_S16_NE, has a fixed buffer size, and does not support the
65 device
= "/dev/audio";
66 if((playrtp_oss_fd
= open(device
, O_WRONLY
)) < 0)
67 fatal(errno
, "error opening %s", device
);
68 playrtp_oss_bufsize
= 4608;
70 int rate
= 44100, stereo
= 1, format
= AFMT_S16_BE
;
72 if(access("/dev/dsp", W_OK
) == 0)
74 else if(access("/dev/audio", W_OK
) == 0)
75 device
= "/dev/audio";
77 fatal(0, "cannot determine default audio device");
79 if((playrtp_oss_fd
= open(device
, O_WRONLY
)) < 0)
80 fatal(errno
, "error opening %s", device
);
81 if(ioctl(playrtp_oss_fd
, SNDCTL_DSP_SETFMT
, &format
) < 0)
82 fatal(errno
, "ioctl SNDCTL_DSP_SETFMT");
83 if(ioctl(playrtp_oss_fd
, SNDCTL_DSP_STEREO
, &stereo
) < 0)
84 fatal(errno
, "ioctl SNDCTL_DSP_STEREO");
85 if(ioctl(playrtp_oss_fd
, SNDCTL_DSP_SPEED
, &rate
) < 0)
86 fatal(errno
, "ioctl SNDCTL_DSP_SPEED");
88 error(0, "asking for 44100Hz, got %dHz", rate
);
89 if(ioctl(playrtp_oss_fd
, SNDCTL_DSP_GETBLKSIZE
, &playrtp_oss_bufsize
) < 0)
90 fatal(errno
, "ioctl SNDCTL_DSP_GETBLKSIZE");
91 info("OSS buffer size %d", playrtp_oss_bufsize
);
93 playrtp_oss_buffer
= xmalloc(playrtp_oss_bufsize
);
94 playrtp_oss_bufused
= 0;
95 nonblock(playrtp_oss_fd
);
99 /** @brief Flush the OSS output buffer
100 * @return 0 on success, non-0 on error
102 static int playrtp_oss_flush(void) {
105 if(!playrtp_oss_bufused
)
106 return 0; /* nothing to do */
107 /* 0 out the unused portion of the buffer */
108 memset(playrtp_oss_buffer
+ playrtp_oss_bufused
, 0,
109 playrtp_oss_bufsize
- playrtp_oss_bufused
);
111 /* empeg audio driver insists on native-endian samples */
114 *const limit
= (uint16_t *)(playrtp_oss_buffer
+ playrtp_oss_bufused
);
116 for(ptr
= (uint16_t *)playrtp_oss_buffer
; ptr
< limit
; ++ptr
)
121 nbyteswritten
= write(playrtp_oss_fd
,
122 playrtp_oss_buffer
, playrtp_oss_bufsize
);
123 if(nbyteswritten
< 0) {
126 break; /* try again */
128 return 0; /* try later */
130 error(errno
, "error writing to %s", device
);
134 if(nbyteswritten
< playrtp_oss_bufsize
)
135 error(0, "%s: short write (%d/%d)",
136 device
, nbyteswritten
, playrtp_oss_bufsize
);
139 const int16_t *sp
= (const int16_t *)playrtp_oss_buffer
;
141 for(count
= 0; count
< playrtp_oss_bufsize
; count
+= sizeof(int16_t)) {
142 dump_buffer
[dump_index
++] = (int16_t)ntohs(*sp
++);
143 dump_index
%= dump_size
;
146 playrtp_oss_bufused
= 0;
152 /** @brief Wait until the audio device can accept more data */
153 static void playrtp_oss_wait(void) {
154 struct pollfd fds
[1];
158 fds
[0].fd
= playrtp_oss_fd
;
159 fds
[0].events
= POLLOUT
;
160 while((n
= poll(fds
, 1, -1)) < 0 && errno
== EINTR
)
163 fatal(errno
, "calling poll");
164 } while(!(fds
[0].revents
& (POLLOUT
|POLLERR
)));
167 /** @brief Close the OSS output device
168 * @param hard If nonzero, drop pending data
170 static void playrtp_oss_disable(int hard
) {
173 /* No SNDCTL_DSP_ ioctls on empeg */
174 if(ioctl(playrtp_oss_fd
, SNDCTL_DSP_RESET
, 0) < 0)
175 error(errno
, "ioctl SNDCTL_DSP_RESET");
179 xclose(playrtp_oss_fd
);
181 free(playrtp_oss_buffer
);
182 playrtp_oss_buffer
= 0;
185 /** @brief Write samples to OSS output device
186 * @param data Pointer to sample data
187 * @param samples Number of samples
188 * @return 0 on success, non-0 on error
190 static int playrtp_oss_write(const char *data
, size_t samples
) {
191 long bytes
= samples
* sizeof(int16_t);
193 int n
= playrtp_oss_bufsize
- playrtp_oss_bufused
;
197 memcpy(playrtp_oss_buffer
+ playrtp_oss_bufused
, data
, n
);
200 playrtp_oss_bufused
+= n
;
201 if(playrtp_oss_bufused
== playrtp_oss_bufsize
)
202 if(playrtp_oss_flush())
205 next_timestamp
+= samples
;
209 /** @brief Play some data from packet @p p
211 * @p p is assumed to contain @ref next_timestamp.
213 static int playrtp_oss_play(const struct packet
*p
) {
214 return playrtp_oss_write
215 ((const char *)(p
->samples_raw
+ next_timestamp
- p
->timestamp
),
216 (p
->timestamp
+ p
->nsamples
) - next_timestamp
);
219 /** @brief Play some silence before packet @p p
221 * @p p is assumed to be entirely before @ref next_timestamp.
223 static int playrtp_oss_infill(const struct packet
*p
) {
224 static const char zeros
[INFILL_SAMPLES
* sizeof(int16_t)];
225 size_t samples_available
= INFILL_SAMPLES
;
227 if(p
&& samples_available
> p
->timestamp
- next_timestamp
)
228 samples_available
= p
->timestamp
- next_timestamp
;
229 return playrtp_oss_write(zeros
, samples_available
);
232 /** @brief OSS backend for playrtp */
233 void playrtp_oss(void) {
235 const struct packet
*p
;
237 pthread_mutex_lock(&lock
);
239 /* Wait for the buffer to fill up a bit */
240 playrtp_fill_buffer();
241 playrtp_oss_enable();
244 /* Keep playing until the buffer empties out, we get an error */
245 while((nsamples
>= minbuffer
247 && contains(pheap_first(&packets
), next_timestamp
)))
249 /* Wait until we can play more */
250 pthread_mutex_unlock(&lock
);
252 pthread_mutex_lock(&lock
);
253 /* Device is ready for more data, find something to play */
254 p
= playrtp_next_packet();
255 /* Play it or play some silence */
256 if(contains(p
, next_timestamp
))
257 escape
= playrtp_oss_play(p
);
259 escape
= playrtp_oss_infill(p
);
262 /* We stop playing for a bit until the buffer re-fills */
263 pthread_mutex_unlock(&lock
);
264 playrtp_oss_disable(escape
);
265 pthread_mutex_lock(&lock
);