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);