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 2 of the License, or
9 * (at your option) any later version.
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.
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
21 /** @file clients/playrtp-oss.c
22 * @brief RTP player - OSS and empeg support
27 #if HAVE_SYS_SOUNDCARD_H || EMPEG_HOST
31 #include <sys/ioctl.h>
33 #include <sys/soundcard.h>
49 /** @brief /dev/dsp (or whatever) */
50 static int playrtp_oss_fd
= -1;
52 /** @brief Audio buffer */
53 static char *playrtp_oss_buffer
;
55 /** @brief Size of @ref playrtp_oss_buffer in bytes */
56 static int playrtp_oss_bufsize
;
58 /** @brief Number of bytes used in @ref playrtp_oss_buffer */
59 static int playrtp_oss_bufused
;
61 /** @brief Open and configure the OSS audio device */
62 static void playrtp_oss_enable(void) {
63 if(playrtp_oss_fd
== -1) {
65 /* empeg audio driver only knows /dev/audio, only supports the equivalent
66 * of AFMT_S16_NE, has a fixed buffer size, and does not support the
69 device
= "/dev/audio";
70 if((playrtp_oss_fd
= open(device
, O_WRONLY
)) < 0)
71 fatal(errno
, "error opening %s", device
);
72 playrtp_oss_bufsize
= 4608;
74 int rate
= 44100, stereo
= 1, format
= AFMT_S16_BE
;
76 if(access("/dev/dsp", W_OK
) == 0)
78 else if(access("/dev/audio", W_OK
) == 0)
79 device
= "/dev/audio";
81 fatal(0, "cannot determine default audio device");
83 if((playrtp_oss_fd
= open(device
, O_WRONLY
)) < 0)
84 fatal(errno
, "error opening %s", device
);
85 if(ioctl(playrtp_oss_fd
, SNDCTL_DSP_SETFMT
, &format
) < 0)
86 fatal(errno
, "ioctl SNDCTL_DSP_SETFMT");
87 if(ioctl(playrtp_oss_fd
, SNDCTL_DSP_STEREO
, &stereo
) < 0)
88 fatal(errno
, "ioctl SNDCTL_DSP_STEREO");
89 if(ioctl(playrtp_oss_fd
, SNDCTL_DSP_SPEED
, &rate
) < 0)
90 fatal(errno
, "ioctl SNDCTL_DSP_SPEED");
92 error(0, "asking for 44100Hz, got %dHz", rate
);
93 if(ioctl(playrtp_oss_fd
, SNDCTL_DSP_GETBLKSIZE
, &playrtp_oss_bufsize
) < 0)
94 fatal(errno
, "ioctl SNDCTL_DSP_GETBLKSIZE");
95 info("OSS buffer size %d", playrtp_oss_bufsize
);
97 playrtp_oss_buffer
= xmalloc(playrtp_oss_bufsize
);
98 playrtp_oss_bufused
= 0;
99 nonblock(playrtp_oss_fd
);
103 /** @brief Flush the OSS output buffer
104 * @return 0 on success, non-0 on error
106 static int playrtp_oss_flush(void) {
109 if(!playrtp_oss_bufused
)
110 return 0; /* nothing to do */
111 /* 0 out the unused portion of the buffer */
112 memset(playrtp_oss_buffer
+ playrtp_oss_bufused
, 0,
113 playrtp_oss_bufsize
- playrtp_oss_bufused
);
115 /* empeg audio driver insists on native-endian samples */
118 *const limit
= (uint16_t *)(playrtp_oss_buffer
+ playrtp_oss_bufused
);
120 for(ptr
= (uint16_t *)playrtp_oss_buffer
; ptr
< limit
; ++ptr
)
125 nbyteswritten
= write(playrtp_oss_fd
,
126 playrtp_oss_buffer
, playrtp_oss_bufsize
);
127 if(nbyteswritten
< 0) {
130 break; /* try again */
132 return 0; /* try later */
134 error(errno
, "error writing to %s", device
);
138 if(nbyteswritten
< playrtp_oss_bufsize
)
139 error(0, "%s: short write (%d/%d)",
140 device
, nbyteswritten
, playrtp_oss_bufsize
);
141 playrtp_oss_bufused
= 0;
147 /** @brief Wait until the audio device can accept more data */
148 static void playrtp_oss_wait(void) {
149 struct pollfd fds
[1];
153 fds
[0].fd
= playrtp_oss_fd
;
154 fds
[0].events
= POLLOUT
;
155 while((n
= poll(fds
, 1, -1)) < 0 && errno
== EINTR
)
158 fatal(errno
, "calling poll");
159 } while(!(fds
[0].revents
& (POLLOUT
|POLLERR
)));
162 /** @brief Close the OSS output device
163 * @param hard If nonzero, drop pending data
165 static void playrtp_oss_disable(int hard
) {
168 /* No SNDCTL_DSP_ ioctls on empeg */
169 if(ioctl(playrtp_oss_fd
, SNDCTL_DSP_RESET
, 0) < 0)
170 error(errno
, "ioctl SNDCTL_DSP_RESET");
174 xclose(playrtp_oss_fd
);
176 free(playrtp_oss_buffer
);
177 playrtp_oss_buffer
= 0;
180 /** @brief Write samples to OSS output device
181 * @param data Pointer to sample data
182 * @param nsamples Number of samples
183 * @return 0 on success, non-0 on error
185 static int playrtp_oss_write(const char *data
, size_t samples
) {
186 long bytes
= samples
* sizeof(int16_t);
188 int n
= playrtp_oss_bufsize
- playrtp_oss_bufused
;
192 memcpy(playrtp_oss_buffer
+ playrtp_oss_bufused
, data
, n
);
195 playrtp_oss_bufused
+= n
;
196 if(playrtp_oss_bufused
== playrtp_oss_bufsize
)
197 if(playrtp_oss_flush())
200 next_timestamp
+= samples
;
204 /** @brief Play some data from packet @p p
206 * @p p is assumed to contain @ref next_timestamp.
208 static int playrtp_oss_play(const struct packet
*p
) {
209 return playrtp_oss_write
210 ((const char *)(p
->samples_raw
+ next_timestamp
- p
->timestamp
),
211 (p
->timestamp
+ p
->nsamples
) - next_timestamp
);
214 /** @brief Play some silence before packet @p p
216 * @p p is assumed to be entirely before @ref next_timestamp.
218 static int playrtp_oss_infill(const struct packet
*p
) {
219 static const char zeros
[INFILL_SAMPLES
* sizeof(int16_t)];
220 size_t samples_available
= INFILL_SAMPLES
;
222 if(p
&& samples_available
> p
->timestamp
- next_timestamp
)
223 samples_available
= p
->timestamp
- next_timestamp
;
224 return playrtp_oss_write(zeros
, samples_available
);
227 /** @brief OSS backend for playrtp */
228 void playrtp_oss(void) {
230 const struct packet
*p
;
232 pthread_mutex_lock(&lock
);
234 /* Wait for the buffer to fill up a bit */
235 playrtp_fill_buffer();
236 playrtp_oss_enable();
239 /* Keep playing until the buffer empties out, we get an error */
240 while((nsamples
>= minbuffer
242 && contains(pheap_first(&packets
), next_timestamp
)))
244 /* Wait until we can play more */
245 pthread_mutex_unlock(&lock
);
247 pthread_mutex_lock(&lock
);
248 /* Device is ready for more data, find something to play */
249 p
= playrtp_next_packet();
250 /* Play it or play some silence */
251 if(contains(p
, next_timestamp
))
252 escape
= playrtp_oss_play(p
);
254 escape
= playrtp_oss_infill(p
);
257 /* We stop playing for a bit until the buffer re-fills */
258 pthread_mutex_unlock(&lock
);
259 playrtp_oss_disable(escape
);
260 pthread_mutex_lock(&lock
);