+/*
+ * This file is part of DisOrder
+ * Copyright (C) 2007 Richard Kettlewell
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ * USA
+ */
+/** @file server/speaker-oss.c
+ * @brief Support for @ref BACKEND_OSS */
+
+#include <config.h>
+
+#if HAVE_SYS_SOUNDCARD_H
+
+#include "types.h"
+
+#include <unistd.h>
+#include <poll.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/ioctl.h>
+#include <sys/soundcard.h>
+
+#include "configuration.h"
+#include "syscalls.h"
+#include "log.h"
+#include "speaker-protocol.h"
+#include "speaker.h"
+
+/** @brief Current device */
+static int ossfd = -1;
+
+/** @brief OSS backend initialization */
+static void oss_init(void) {
+ info("selected OSS backend");
+}
+
+/** @brief OSS deactivation */
+static void oss_deactivate(void) {
+ if(ossfd != -1) {
+ xclose(ossfd);
+ ossfd = -1;
+ device_state = device_closed;
+ D(("released audio device"));
+ }
+}
+
+/** @brief OSS backend activation */
+static void oss_activate(void) {
+ int stereo, format, rate;
+ const char *device;
+
+ if(ossfd == -1) {
+ /* Try to pick a device */
+ if(!strcmp(config->device, "default")) {
+ if(access("/dev/dsp", W_OK) == 0)
+ device = "/dev/dsp";
+ else if(access("/dev/audio", W_OK) == 0)
+ device = "/dev/audio";
+ } else
+ device = config->device; /* just believe the user */
+ /* Open the device */
+ if((ossfd = open(device, O_WRONLY, 0)) < 0) {
+ error(errno, "error opening %s", device);
+ goto failed;
+ }
+ /* Set the audio format */
+ stereo = (config->sample_format.channels == 2);
+ if(ioctl(ossfd, SNDCTL_DSP_STEREO, &stereo) < 0) {
+ error(errno, "error calling ioctl SNDCTL_DSP_STEREO %d", stereo);
+ goto failed;
+ }
+ if(config->sample_format.bits == 8)
+ format = AFMT_U8;
+ else if(config->sample_format.bits == 16)
+ format = (config->sample_format.endian == ENDIAN_LITTLE
+ ? AFMT_S16_LE : AFMT_S16_BE);
+ else {
+ error(0, "unsupported sample_format for oss backend");
+ goto failed;
+ }
+ if(ioctl(ossfd, SNDCTL_DSP_SETFMT, &format) < 0) {
+ error(errno, "error calling ioctl SNDCTL_DSP_SETFMT %#x", format);
+ goto failed;
+ }
+ rate = config->sample_format.rate;
+ if(ioctl(ossfd, SNDCTL_DSP_SPEED, &rate) < 0) {
+ error(errno, "error calling ioctl SNDCTL_DSP_SPEED %d", rate);
+ goto failed;
+ }
+ if((unsigned)rate != config->sample_format.rate)
+ error(0, "asked for %luHz, got %dHz",
+ (unsigned long)config->sample_format.rate, rate);
+ nonblock(ossfd);
+ device_state = device_open;
+ }
+ return;
+failed:
+ device_state = device_error;
+ if(ossfd >= 0)
+ xclose(ossfd);
+}
+
+/** @brief Play via OSS */
+static size_t oss_play(size_t frames) {
+ const size_t bytes_to_play = frames * bpf;
+ ssize_t bytes_written;
+
+ bytes_written = write(ossfd, playing->buffer + playing->start,
+ bytes_to_play);
+ if(bytes_written < 0)
+ switch(errno) {
+ case EINTR: /* interruped */
+ case EAGAIN: /* overrun */
+ return 0; /* try again later */
+ default:
+ fatal(errno, "error writing to audio device");
+ }
+ return bytes_written / bpf;
+}
+
+static int oss_slot;
+
+/** @brief Fill in poll fd array for OSS */
+static void oss_beforepoll(void) {
+ oss_slot = addfd(ossfd, POLLOUT|POLLERR);
+}
+
+/** @brief Process poll() results for OSS */
+static int oss_ready(void) {
+ return !!(fds[oss_slot].revents & (POLLOUT|POLLERR));
+}
+
+const struct speaker_backend oss_backend = {
+ BACKEND_OSS,
+ 0,
+ oss_init,
+ oss_activate,
+ oss_play,
+ oss_deactivate,
+ oss_beforepoll,
+ oss_ready
+};
+
+#endif
+
+/*
+Local Variables:
+c-basic-offset:2
+comment-column:40
+fill-column:79
+indent-tabs-mode:nil
+End:
+*/
~mdw / disorder / commitdiff