mirror of
https://github.com/libretro/RetroArch.git
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161 lines
3.3 KiB
C
161 lines
3.3 KiB
C
/* SSNES - A Super Nintendo Entertainment System (SNES) Emulator frontend for libsnes.
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* Copyright (C) 2010-2012 - Hans-Kristian Arntzen
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*
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* Some code herein may be based on code found in BSNES.
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*
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* SSNES is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* SSNES is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with SSNES.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "driver.h"
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#include "general.h"
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#include <stdlib.h>
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#ifdef HAVE_OSS_BSD
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#include <soundcard.h>
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#else
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#include <sys/soundcard.h>
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#endif
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdio.h>
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#ifdef HAVE_OSS_BSD
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#define DEFAULT_OSS_DEV "/dev/audio"
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#else
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#define DEFAULT_OSS_DEV "/dev/dsp"
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#endif
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static void *oss_init(const char *device, unsigned rate, unsigned latency)
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{
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int *fd = (int*)calloc(1, sizeof(int));
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if (fd == NULL)
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return NULL;
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const char *oss_device = DEFAULT_OSS_DEV;
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if (device != NULL)
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oss_device = device;
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if ((*fd = open(oss_device, O_WRONLY)) < 0)
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{
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free(fd);
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return NULL;
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}
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int frags = (latency * rate * 4)/(1000 * (1 << 9));
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int frag = (frags << 16) | 9;
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if (ioctl(*fd, SNDCTL_DSP_SETFRAGMENT, &frag) < 0)
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{
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close(*fd);
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free(fd);
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return NULL;
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}
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int channels = 2;
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int format = is_little_endian() ?
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AFMT_S16_LE : AFMT_S16_BE;
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if (ioctl(*fd, SNDCTL_DSP_CHANNELS, &channels) < 0)
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{
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close(*fd);
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free(fd);
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return NULL;
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}
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if (ioctl(*fd, SNDCTL_DSP_SETFMT, &format) < 0)
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{
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close(*fd);
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free(fd);
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return NULL;
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}
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if (ioctl(*fd, SNDCTL_DSP_SPEED, &rate) < 0)
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{
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close(*fd);
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free(fd);
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return NULL;
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}
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return fd;
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}
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static ssize_t oss_write(void *data, const void *buf, size_t size)
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{
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int *fd = (int*)data;
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if (size == 0)
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return 0;
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ssize_t ret;
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if ((ret = write(*fd, buf, size)) <= 0)
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{
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if ((fcntl(*fd, F_GETFL) & O_NONBLOCK) && errno == EAGAIN)
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return 0;
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return -1;
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}
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return ret;
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}
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static bool oss_stop(void *data)
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{
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int *fd = (int*)data;
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ioctl(*fd, SNDCTL_DSP_RESET, 0);
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return true;
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}
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static bool oss_start(void *data)
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{
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return true;
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}
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static void oss_set_nonblock_state(void *data, bool state)
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{
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int *fd = (int*)data;
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int rc;
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if (state)
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rc = fcntl(*fd, F_SETFL, fcntl(*fd, F_GETFL) | O_NONBLOCK);
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else
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rc = fcntl(*fd, F_SETFL, fcntl(*fd, F_GETFL) & (~O_NONBLOCK));
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if (rc != 0)
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fprintf(stderr, "SSNES [ERROR]: Could not set nonblocking on OSS file descriptor. Will not be able to fast-forward.\n");
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}
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static void oss_free(void *data)
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{
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int *fd = (int*)data;
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ioctl(*fd, SNDCTL_DSP_RESET, 0);
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close(*fd);
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free(fd);
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}
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const audio_driver_t audio_oss = {
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oss_init,
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oss_write,
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oss_stop,
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oss_start,
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oss_set_nonblock_state,
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oss_free,
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NULL,
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"oss"
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};
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